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LeafOS / LeafOS-Project / android_frameworks_base / 261b3b13b0b950d58865f70592b2223de14869ae / . / media / java / android / media / ExifInterface.java
blob: d83cd96994666877435c434ecfe4905c78a59187 [file] [log] [blame]
/*
* Copyright (C) 2007 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package android.media;
import android.annotation.CurrentTimeMillisLong;
import android.annotation.IntDef;
import android.annotation.NonNull;
import android.annotation.Nullable;
import android.annotation.UnsupportedAppUsage;
import android.content.res.AssetManager;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Build;
import android.system.ErrnoException;
import android.system.Os;
import android.system.OsConstants;
import android.util.Log;
import android.util.Pair;
import com.android.internal.util.ArrayUtils;
import libcore.io.IoUtils;
import libcore.io.Streams;
import java.io.BufferedInputStream;
import java.io.ByteArrayInputStream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.EOFException;
import java.io.File;
import java.io.FileDescriptor;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.nio.ByteBuffer;
import java.nio.ByteOrder;
import java.nio.charset.Charset;
import java.text.ParsePosition;
import java.text.SimpleDateFormat;
import java.util.Arrays;
import java.util.Date;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.Set;
import java.util.TimeZone;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* This is a class for reading and writing Exif tags in a JPEG file or a RAW image file.
* <p>
* Supported formats are: JPEG, DNG, CR2, NEF, NRW, ARW, RW2, ORF, PEF, SRW, RAF and HEIF.
* <p>
* Attribute mutation is supported for JPEG image files.
* <p>
* Note: It is recommended to use the <a href="{@docRoot}jetpack/androidx.html">AndroidX</a>
* <a href="{@docRoot}reference/androidx/exifinterface/media/ExifInterface.html">ExifInterface
* Library</a> since it is a superset of this class. In addition to the functionalities of this
* class, it supports parsing extra metadata such as exposure and data compression information
* as well as setting extra metadata such as GPS and datetime information.
*/
public class ExifInterface {
private static final String TAG = "ExifInterface";
private static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
// The Exif tag names. See Tiff 6.0 Section 3 and Section 8.
/** Type is String. */
public static final String TAG_ARTIST = "Artist";
/** Type is int. */
public static final String TAG_BITS_PER_SAMPLE = "BitsPerSample";
/** Type is int. */
public static final String TAG_COMPRESSION = "Compression";
/** Type is String. */
public static final String TAG_COPYRIGHT = "Copyright";
/** Type is String. */
public static final String TAG_DATETIME = "DateTime";
/** Type is String. */
public static final String TAG_IMAGE_DESCRIPTION = "ImageDescription";
/** Type is int. */
public static final String TAG_IMAGE_LENGTH = "ImageLength";
/** Type is int. */
public static final String TAG_IMAGE_WIDTH = "ImageWidth";
/** Type is int. */
public static final String TAG_JPEG_INTERCHANGE_FORMAT = "JPEGInterchangeFormat";
/** Type is int. */
public static final String TAG_JPEG_INTERCHANGE_FORMAT_LENGTH = "JPEGInterchangeFormatLength";
/** Type is String. */
public static final String TAG_MAKE = "Make";
/** Type is String. */
public static final String TAG_MODEL = "Model";
/** Type is int. */
public static final String TAG_ORIENTATION = "Orientation";
/** Type is int. */
public static final String TAG_PHOTOMETRIC_INTERPRETATION = "PhotometricInterpretation";
/** Type is int. */
public static final String TAG_PLANAR_CONFIGURATION = "PlanarConfiguration";
/** Type is rational. */
public static final String TAG_PRIMARY_CHROMATICITIES = "PrimaryChromaticities";
/** Type is rational. */
public static final String TAG_REFERENCE_BLACK_WHITE = "ReferenceBlackWhite";
/** Type is int. */
public static final String TAG_RESOLUTION_UNIT = "ResolutionUnit";
/** Type is int. */
public static final String TAG_ROWS_PER_STRIP = "RowsPerStrip";
/** Type is int. */
public static final String TAG_SAMPLES_PER_PIXEL = "SamplesPerPixel";
/** Type is String. */
public static final String TAG_SOFTWARE = "Software";
/** Type is int. */
public static final String TAG_STRIP_BYTE_COUNTS = "StripByteCounts";
/** Type is int. */
public static final String TAG_STRIP_OFFSETS = "StripOffsets";
/** Type is int. */
public static final String TAG_TRANSFER_FUNCTION = "TransferFunction";
/** Type is rational. */
public static final String TAG_WHITE_POINT = "WhitePoint";
/** Type is rational. */
public static final String TAG_X_RESOLUTION = "XResolution";
/** Type is rational. */
public static final String TAG_Y_CB_CR_COEFFICIENTS = "YCbCrCoefficients";
/** Type is int. */
public static final String TAG_Y_CB_CR_POSITIONING = "YCbCrPositioning";
/** Type is int. */
public static final String TAG_Y_CB_CR_SUB_SAMPLING = "YCbCrSubSampling";
/** Type is rational. */
public static final String TAG_Y_RESOLUTION = "YResolution";
/** Type is rational. */
public static final String TAG_APERTURE_VALUE = "ApertureValue";
/** Type is rational. */
public static final String TAG_BRIGHTNESS_VALUE = "BrightnessValue";
/** Type is String. */
public static final String TAG_CFA_PATTERN = "CFAPattern";
/** Type is int. */
public static final String TAG_COLOR_SPACE = "ColorSpace";
/** Type is String. */
public static final String TAG_COMPONENTS_CONFIGURATION = "ComponentsConfiguration";
/** Type is rational. */
public static final String TAG_COMPRESSED_BITS_PER_PIXEL = "CompressedBitsPerPixel";
/** Type is int. */
public static final String TAG_CONTRAST = "Contrast";
/** Type is int. */
public static final String TAG_CUSTOM_RENDERED = "CustomRendered";
/** Type is String. */
public static final String TAG_DATETIME_DIGITIZED = "DateTimeDigitized";
/** Type is String. */
public static final String TAG_DATETIME_ORIGINAL = "DateTimeOriginal";
/** Type is String. */
public static final String TAG_DEVICE_SETTING_DESCRIPTION = "DeviceSettingDescription";
/** Type is double. */
public static final String TAG_DIGITAL_ZOOM_RATIO = "DigitalZoomRatio";
/** Type is String. */
public static final String TAG_EXIF_VERSION = "ExifVersion";
/** Type is double. */
public static final String TAG_EXPOSURE_BIAS_VALUE = "ExposureBiasValue";
/** Type is rational. */
public static final String TAG_EXPOSURE_INDEX = "ExposureIndex";
/** Type is int. */
public static final String TAG_EXPOSURE_MODE = "ExposureMode";
/** Type is int. */
public static final String TAG_EXPOSURE_PROGRAM = "ExposureProgram";
/** Type is double. */
public static final String TAG_EXPOSURE_TIME = "ExposureTime";
/** Type is double. */
public static final String TAG_F_NUMBER = "FNumber";
/**
* Type is double.
*
* @deprecated use {@link #TAG_F_NUMBER} instead
*/
@Deprecated
public static final String TAG_APERTURE = "FNumber";
/** Type is String. */
public static final String TAG_FILE_SOURCE = "FileSource";
/** Type is int. */
public static final String TAG_FLASH = "Flash";
/** Type is rational. */
public static final String TAG_FLASH_ENERGY = "FlashEnergy";
/** Type is String. */
public static final String TAG_FLASHPIX_VERSION = "FlashpixVersion";
/** Type is rational. */
public static final String TAG_FOCAL_LENGTH = "FocalLength";
/** Type is int. */
public static final String TAG_FOCAL_LENGTH_IN_35MM_FILM = "FocalLengthIn35mmFilm";
/** Type is int. */
public static final String TAG_FOCAL_PLANE_RESOLUTION_UNIT = "FocalPlaneResolutionUnit";
/** Type is rational. */
public static final String TAG_FOCAL_PLANE_X_RESOLUTION = "FocalPlaneXResolution";
/** Type is rational. */
public static final String TAG_FOCAL_PLANE_Y_RESOLUTION = "FocalPlaneYResolution";
/** Type is int. */
public static final String TAG_GAIN_CONTROL = "GainControl";
/** Type is int. */
public static final String TAG_ISO_SPEED_RATINGS = "ISOSpeedRatings";
/**
* Type is int.
*
* @deprecated use {@link #TAG_ISO_SPEED_RATINGS} instead
*/
@Deprecated
public static final String TAG_ISO = "ISOSpeedRatings";
/** Type is String. */
public static final String TAG_IMAGE_UNIQUE_ID = "ImageUniqueID";
/** Type is int. */
public static final String TAG_LIGHT_SOURCE = "LightSource";
/** Type is String. */
public static final String TAG_MAKER_NOTE = "MakerNote";
/** Type is rational. */
public static final String TAG_MAX_APERTURE_VALUE = "MaxApertureValue";
/** Type is int. */
public static final String TAG_METERING_MODE = "MeteringMode";
/** Type is int. */
public static final String TAG_NEW_SUBFILE_TYPE = "NewSubfileType";
/** Type is String. */
public static final String TAG_OECF = "OECF";
/** Type is String. {@hide} */
public static final String TAG_OFFSET_TIME = "OffsetTime";
/** Type is String. {@hide} */
public static final String TAG_OFFSET_TIME_ORIGINAL = "OffsetTimeOriginal";
/** Type is String. {@hide} */
public static final String TAG_OFFSET_TIME_DIGITIZED = "OffsetTimeDigitized";
/** Type is int. */
public static final String TAG_PIXEL_X_DIMENSION = "PixelXDimension";
/** Type is int. */
public static final String TAG_PIXEL_Y_DIMENSION = "PixelYDimension";
/** Type is String. */
public static final String TAG_RELATED_SOUND_FILE = "RelatedSoundFile";
/** Type is int. */
public static final String TAG_SATURATION = "Saturation";
/** Type is int. */
public static final String TAG_SCENE_CAPTURE_TYPE = "SceneCaptureType";
/** Type is String. */
public static final String TAG_SCENE_TYPE = "SceneType";
/** Type is int. */
public static final String TAG_SENSING_METHOD = "SensingMethod";
/** Type is int. */
public static final String TAG_SHARPNESS = "Sharpness";
/** Type is rational. */
public static final String TAG_SHUTTER_SPEED_VALUE = "ShutterSpeedValue";
/** Type is String. */
public static final String TAG_SPATIAL_FREQUENCY_RESPONSE = "SpatialFrequencyResponse";
/** Type is String. */
public static final String TAG_SPECTRAL_SENSITIVITY = "SpectralSensitivity";
/** Type is int. */
public static final String TAG_SUBFILE_TYPE = "SubfileType";
/** Type is String. */
public static final String TAG_SUBSEC_TIME = "SubSecTime";
/**
* Type is String.
*
* @deprecated use {@link #TAG_SUBSEC_TIME_DIGITIZED} instead
*/
public static final String TAG_SUBSEC_TIME_DIG = "SubSecTimeDigitized";
/** Type is String. */
public static final String TAG_SUBSEC_TIME_DIGITIZED = "SubSecTimeDigitized";
/**
* Type is String.
*
* @deprecated use {@link #TAG_SUBSEC_TIME_ORIGINAL} instead
*/
public static final String TAG_SUBSEC_TIME_ORIG = "SubSecTimeOriginal";
/** Type is String. */
public static final String TAG_SUBSEC_TIME_ORIGINAL = "SubSecTimeOriginal";
/** Type is int. */
public static final String TAG_SUBJECT_AREA = "SubjectArea";
/** Type is double. */
public static final String TAG_SUBJECT_DISTANCE = "SubjectDistance";
/** Type is int. */
public static final String TAG_SUBJECT_DISTANCE_RANGE = "SubjectDistanceRange";
/** Type is int. */
public static final String TAG_SUBJECT_LOCATION = "SubjectLocation";
/** Type is String. */
public static final String TAG_USER_COMMENT = "UserComment";
/** Type is int. */
public static final String TAG_WHITE_BALANCE = "WhiteBalance";
/**
* The altitude (in meters) based on the reference in TAG_GPS_ALTITUDE_REF.
* Type is rational.
*/
public static final String TAG_GPS_ALTITUDE = "GPSAltitude";
/**
* 0 if the altitude is above sea level. 1 if the altitude is below sea
* level. Type is int.
*/
public static final String TAG_GPS_ALTITUDE_REF = "GPSAltitudeRef";
/** Type is String. */
public static final String TAG_GPS_AREA_INFORMATION = "GPSAreaInformation";
/** Type is rational. */
public static final String TAG_GPS_DOP = "GPSDOP";
/** Type is String. */
public static final String TAG_GPS_DATESTAMP = "GPSDateStamp";
/** Type is rational. */
public static final String TAG_GPS_DEST_BEARING = "GPSDestBearing";
/** Type is String. */
public static final String TAG_GPS_DEST_BEARING_REF = "GPSDestBearingRef";
/** Type is rational. */
public static final String TAG_GPS_DEST_DISTANCE = "GPSDestDistance";
/** Type is String. */
public static final String TAG_GPS_DEST_DISTANCE_REF = "GPSDestDistanceRef";
/** Type is rational. */
public static final String TAG_GPS_DEST_LATITUDE = "GPSDestLatitude";
/** Type is String. */
public static final String TAG_GPS_DEST_LATITUDE_REF = "GPSDestLatitudeRef";
/** Type is rational. */
public static final String TAG_GPS_DEST_LONGITUDE = "GPSDestLongitude";
/** Type is String. */
public static final String TAG_GPS_DEST_LONGITUDE_REF = "GPSDestLongitudeRef";
/** Type is int. */
public static final String TAG_GPS_DIFFERENTIAL = "GPSDifferential";
/** Type is rational. */
public static final String TAG_GPS_IMG_DIRECTION = "GPSImgDirection";
/** Type is String. */
public static final String TAG_GPS_IMG_DIRECTION_REF = "GPSImgDirectionRef";
/** Type is rational. Format is "num1/denom1,num2/denom2,num3/denom3". */
public static final String TAG_GPS_LATITUDE = "GPSLatitude";
/** Type is String. */
public static final String TAG_GPS_LATITUDE_REF = "GPSLatitudeRef";
/** Type is rational. Format is "num1/denom1,num2/denom2,num3/denom3". */
public static final String TAG_GPS_LONGITUDE = "GPSLongitude";
/** Type is String. */
public static final String TAG_GPS_LONGITUDE_REF = "GPSLongitudeRef";
/** Type is String. */
public static final String TAG_GPS_MAP_DATUM = "GPSMapDatum";
/** Type is String. */
public static final String TAG_GPS_MEASURE_MODE = "GPSMeasureMode";
/** Type is String. Name of GPS processing method used for location finding. */
public static final String TAG_GPS_PROCESSING_METHOD = "GPSProcessingMethod";
/** Type is String. */
public static final String TAG_GPS_SATELLITES = "GPSSatellites";
/** Type is rational. */
public static final String TAG_GPS_SPEED = "GPSSpeed";
/** Type is String. */
public static final String TAG_GPS_SPEED_REF = "GPSSpeedRef";
/** Type is String. */
public static final String TAG_GPS_STATUS = "GPSStatus";
/** Type is String. Format is "hh:mm:ss". */
public static final String TAG_GPS_TIMESTAMP = "GPSTimeStamp";
/** Type is rational. */
public static final String TAG_GPS_TRACK = "GPSTrack";
/** Type is String. */
public static final String TAG_GPS_TRACK_REF = "GPSTrackRef";
/** Type is String. */
public static final String TAG_GPS_VERSION_ID = "GPSVersionID";
/** Type is String. */
public static final String TAG_INTEROPERABILITY_INDEX = "InteroperabilityIndex";
/** Type is int. */
public static final String TAG_THUMBNAIL_IMAGE_LENGTH = "ThumbnailImageLength";
/** Type is int. */
public static final String TAG_THUMBNAIL_IMAGE_WIDTH = "ThumbnailImageWidth";
/** Type is int. DNG Specification 1.4.0.0. Section 4 */
public static final String TAG_DNG_VERSION = "DNGVersion";
/** Type is int. DNG Specification 1.4.0.0. Section 4 */
public static final String TAG_DEFAULT_CROP_SIZE = "DefaultCropSize";
/** Type is undefined. See Olympus MakerNote tags in http://www.exiv2.org/tags-olympus.html. */
public static final String TAG_ORF_THUMBNAIL_IMAGE = "ThumbnailImage";
/** Type is int. See Olympus Camera Settings tags in http://www.exiv2.org/tags-olympus.html. */
public static final String TAG_ORF_PREVIEW_IMAGE_START = "PreviewImageStart";
/** Type is int. See Olympus Camera Settings tags in http://www.exiv2.org/tags-olympus.html. */
public static final String TAG_ORF_PREVIEW_IMAGE_LENGTH = "PreviewImageLength";
/** Type is int. See Olympus Image Processing tags in http://www.exiv2.org/tags-olympus.html. */
public static final String TAG_ORF_ASPECT_FRAME = "AspectFrame";
/**
* Type is int. See PanasonicRaw tags in
* http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/PanasonicRaw.html
*/
public static final String TAG_RW2_SENSOR_BOTTOM_BORDER = "SensorBottomBorder";
/**
* Type is int. See PanasonicRaw tags in
* http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/PanasonicRaw.html
*/
public static final String TAG_RW2_SENSOR_LEFT_BORDER = "SensorLeftBorder";
/**
* Type is int. See PanasonicRaw tags in
* http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/PanasonicRaw.html
*/
public static final String TAG_RW2_SENSOR_RIGHT_BORDER = "SensorRightBorder";
/**
* Type is int. See PanasonicRaw tags in
* http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/PanasonicRaw.html
*/
public static final String TAG_RW2_SENSOR_TOP_BORDER = "SensorTopBorder";
/**
* Type is int. See PanasonicRaw tags in
* http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/PanasonicRaw.html
*/
public static final String TAG_RW2_ISO = "ISO";
/**
* Type is undefined. See PanasonicRaw tags in
* http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/PanasonicRaw.html
*/
public static final String TAG_RW2_JPG_FROM_RAW = "JpgFromRaw";
/**
* Type is byte[]. See <a href=
* "https://en.wikipedia.org/wiki/Extensible_Metadata_Platform">Extensible
* Metadata Platform (XMP)</a> for details on contents.
*/
public static final String TAG_XMP = "Xmp";
/**
* Private tags used for pointing the other IFD offsets.
* The types of the following tags are int.
* See JEITA CP-3451C Section 4.6.3: Exif-specific IFD.
* For SubIFD, see Note 1 of Adobe PageMaker® 6.0 TIFF Technical Notes.
*/
private static final String TAG_EXIF_IFD_POINTER = "ExifIFDPointer";
private static final String TAG_GPS_INFO_IFD_POINTER = "GPSInfoIFDPointer";
private static final String TAG_INTEROPERABILITY_IFD_POINTER = "InteroperabilityIFDPointer";
private static final String TAG_SUB_IFD_POINTER = "SubIFDPointer";
// Proprietary pointer tags used for ORF files.
// See http://www.exiv2.org/tags-olympus.html
private static final String TAG_ORF_CAMERA_SETTINGS_IFD_POINTER = "CameraSettingsIFDPointer";
private static final String TAG_ORF_IMAGE_PROCESSING_IFD_POINTER = "ImageProcessingIFDPointer";
// Private tags used for thumbnail information.
private static final String TAG_HAS_THUMBNAIL = "HasThumbnail";
private static final String TAG_THUMBNAIL_OFFSET = "ThumbnailOffset";
private static final String TAG_THUMBNAIL_LENGTH = "ThumbnailLength";
private static final String TAG_THUMBNAIL_DATA = "ThumbnailData";
private static final int MAX_THUMBNAIL_SIZE = 512;
// Constants used for the Orientation Exif tag.
public static final int ORIENTATION_UNDEFINED = 0;
public static final int ORIENTATION_NORMAL = 1;
public static final int ORIENTATION_FLIP_HORIZONTAL = 2; // left right reversed mirror
public static final int ORIENTATION_ROTATE_180 = 3;
public static final int ORIENTATION_FLIP_VERTICAL = 4; // upside down mirror
// flipped about top-left <--> bottom-right axis
public static final int ORIENTATION_TRANSPOSE = 5;
public static final int ORIENTATION_ROTATE_90 = 6; // rotate 90 cw to right it
// flipped about top-right <--> bottom-left axis
public static final int ORIENTATION_TRANSVERSE = 7;
public static final int ORIENTATION_ROTATE_270 = 8; // rotate 270 to right it
// Constants used for white balance
public static final int WHITEBALANCE_AUTO = 0;
public static final int WHITEBALANCE_MANUAL = 1;
// Maximum size for checking file type signature (see image_type_recognition_lite.cc)
private static final int SIGNATURE_CHECK_SIZE = 5000;
private static final byte[] JPEG_SIGNATURE = new byte[] {(byte) 0xff, (byte) 0xd8, (byte) 0xff};
private static final String RAF_SIGNATURE = "FUJIFILMCCD-RAW";
private static final int RAF_OFFSET_TO_JPEG_IMAGE_OFFSET = 84;
private static final int RAF_INFO_SIZE = 160;
private static final int RAF_JPEG_LENGTH_VALUE_SIZE = 4;
private static final byte[] HEIF_TYPE_FTYP = new byte[] {'f', 't', 'y', 'p'};
private static final byte[] HEIF_BRAND_MIF1 = new byte[] {'m', 'i', 'f', '1'};
private static final byte[] HEIF_BRAND_HEIC = new byte[] {'h', 'e', 'i', 'c'};
// See http://fileformats.archiveteam.org/wiki/Olympus_ORF
private static final short ORF_SIGNATURE_1 = 0x4f52;
private static final short ORF_SIGNATURE_2 = 0x5352;
// There are two formats for Olympus Makernote Headers. Each has different identifiers and
// offsets to the actual data.
// See http://www.exiv2.org/makernote.html#R1
private static final byte[] ORF_MAKER_NOTE_HEADER_1 = new byte[] {(byte) 0x4f, (byte) 0x4c,
(byte) 0x59, (byte) 0x4d, (byte) 0x50, (byte) 0x00}; // "OLYMP\0"
private static final byte[] ORF_MAKER_NOTE_HEADER_2 = new byte[] {(byte) 0x4f, (byte) 0x4c,
(byte) 0x59, (byte) 0x4d, (byte) 0x50, (byte) 0x55, (byte) 0x53, (byte) 0x00,
(byte) 0x49, (byte) 0x49}; // "OLYMPUS\0II"
private static final int ORF_MAKER_NOTE_HEADER_1_SIZE = 8;
private static final int ORF_MAKER_NOTE_HEADER_2_SIZE = 12;
// See http://fileformats.archiveteam.org/wiki/RW2
private static final short RW2_SIGNATURE = 0x0055;
// See http://fileformats.archiveteam.org/wiki/Pentax_PEF
private static final String PEF_SIGNATURE = "PENTAX";
// See http://www.exiv2.org/makernote.html#R11
private static final int PEF_MAKER_NOTE_SKIP_SIZE = 6;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
private static SimpleDateFormat sFormatter;
private static SimpleDateFormat sFormatterTz;
// See Exchangeable image file format for digital still cameras: Exif version 2.2.
// The following values are for parsing EXIF data area. There are tag groups in EXIF data area.
// They are called "Image File Directory". They have multiple data formats to cover various
// image metadata from GPS longitude to camera model name.
// Types of Exif byte alignments (see JEITA CP-3451C Section 4.5.2)
private static final short BYTE_ALIGN_II = 0x4949; // II: Intel order
private static final short BYTE_ALIGN_MM = 0x4d4d; // MM: Motorola order
// TIFF Header Fixed Constant (see JEITA CP-3451C Section 4.5.2)
private static final byte START_CODE = 0x2a; // 42
private static final int IFD_OFFSET = 8;
// Formats for the value in IFD entry (See TIFF 6.0 Section 2, "Image File Directory".)
private static final int IFD_FORMAT_BYTE = 1;
private static final int IFD_FORMAT_STRING = 2;
private static final int IFD_FORMAT_USHORT = 3;
private static final int IFD_FORMAT_ULONG = 4;
private static final int IFD_FORMAT_URATIONAL = 5;
private static final int IFD_FORMAT_SBYTE = 6;
private static final int IFD_FORMAT_UNDEFINED = 7;
private static final int IFD_FORMAT_SSHORT = 8;
private static final int IFD_FORMAT_SLONG = 9;
private static final int IFD_FORMAT_SRATIONAL = 10;
private static final int IFD_FORMAT_SINGLE = 11;
private static final int IFD_FORMAT_DOUBLE = 12;
// Format indicating a new IFD entry (See Adobe PageMaker® 6.0 TIFF Technical Notes, "New Tag")
private static final int IFD_FORMAT_IFD = 13;
// Names for the data formats for debugging purpose.
private static final String[] IFD_FORMAT_NAMES = new String[] {
"", "BYTE", "STRING", "USHORT", "ULONG", "URATIONAL", "SBYTE", "UNDEFINED", "SSHORT",
"SLONG", "SRATIONAL", "SINGLE", "DOUBLE"
};
// Sizes of the components of each IFD value format
private static final int[] IFD_FORMAT_BYTES_PER_FORMAT = new int[] {
0, 1, 1, 2, 4, 8, 1, 1, 2, 4, 8, 4, 8, 1
};
private static final byte[] EXIF_ASCII_PREFIX = new byte[] {
0x41, 0x53, 0x43, 0x49, 0x49, 0x0, 0x0, 0x0
};
/**
* Constants used for Compression tag.
* For Value 1, 2, 32773, see TIFF 6.0 Spec Section 3: Bilevel Images, Compression
* For Value 6, see TIFF 6.0 Spec Section 22: JPEG Compression, Extensions to Existing Fields
* For Value 7, 8, 34892, see DNG Specification 1.4.0.0. Section 3, Compression
*/
private static final int DATA_UNCOMPRESSED = 1;
private static final int DATA_HUFFMAN_COMPRESSED = 2;
private static final int DATA_JPEG = 6;
private static final int DATA_JPEG_COMPRESSED = 7;
private static final int DATA_DEFLATE_ZIP = 8;
private static final int DATA_PACK_BITS_COMPRESSED = 32773;
private static final int DATA_LOSSY_JPEG = 34892;
/**
* Constants used for BitsPerSample tag.
* For RGB, see TIFF 6.0 Spec Section 6, Differences from Palette Color Images
* For Greyscale, see TIFF 6.0 Spec Section 4, Differences from Bilevel Images
*/
private static final int[] BITS_PER_SAMPLE_RGB = new int[] { 8, 8, 8 };
private static final int[] BITS_PER_SAMPLE_GREYSCALE_1 = new int[] { 4 };
private static final int[] BITS_PER_SAMPLE_GREYSCALE_2 = new int[] { 8 };
/**
* Constants used for PhotometricInterpretation tag.
* For White/Black, see Section 3, Color.
* See TIFF 6.0 Spec Section 22, Minimum Requirements for TIFF with JPEG Compression.
*/
private static final int PHOTOMETRIC_INTERPRETATION_WHITE_IS_ZERO = 0;
private static final int PHOTOMETRIC_INTERPRETATION_BLACK_IS_ZERO = 1;
private static final int PHOTOMETRIC_INTERPRETATION_RGB = 2;
private static final int PHOTOMETRIC_INTERPRETATION_YCBCR = 6;
/**
* Constants used for NewSubfileType tag.
* See TIFF 6.0 Spec Section 8
* */
private static final int ORIGINAL_RESOLUTION_IMAGE = 0;
private static final int REDUCED_RESOLUTION_IMAGE = 1;
// A class for indicating EXIF rational type.
private static class Rational {
public final long numerator;
public final long denominator;
private Rational(long numerator, long denominator) {
// Handle erroneous case
if (denominator == 0) {
this.numerator = 0;
this.denominator = 1;
return;
}
this.numerator = numerator;
this.denominator = denominator;
}
@Override
public String toString() {
return numerator + "/" + denominator;
}
public double calculate() {
return (double) numerator / denominator;
}
}
// A class for indicating EXIF attribute.
private static class ExifAttribute {
public final int format;
public final int numberOfComponents;
public final long bytesOffset;
public final byte[] bytes;
public static final long BYTES_OFFSET_UNKNOWN = -1;
private ExifAttribute(int format, int numberOfComponents, byte[] bytes) {
this(format, numberOfComponents, BYTES_OFFSET_UNKNOWN, bytes);
}
private ExifAttribute(int format, int numberOfComponents, long bytesOffset, byte[] bytes) {
this.format = format;
this.numberOfComponents = numberOfComponents;
this.bytesOffset = bytesOffset;
this.bytes = bytes;
}
public static ExifAttribute createUShort(int[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_USHORT] * values.length]);
buffer.order(byteOrder);
for (int value : values) {
buffer.putShort((short) value);
}
return new ExifAttribute(IFD_FORMAT_USHORT, values.length, buffer.array());
}
public static ExifAttribute createUShort(int value, ByteOrder byteOrder) {
return createUShort(new int[] {value}, byteOrder);
}
public static ExifAttribute createULong(long[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_ULONG] * values.length]);
buffer.order(byteOrder);
for (long value : values) {
buffer.putInt((int) value);
}
return new ExifAttribute(IFD_FORMAT_ULONG, values.length, buffer.array());
}
public static ExifAttribute createULong(long value, ByteOrder byteOrder) {
return createULong(new long[] {value}, byteOrder);
}
public static ExifAttribute createSLong(int[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_SLONG] * values.length]);
buffer.order(byteOrder);
for (int value : values) {
buffer.putInt(value);
}
return new ExifAttribute(IFD_FORMAT_SLONG, values.length, buffer.array());
}
public static ExifAttribute createSLong(int value, ByteOrder byteOrder) {
return createSLong(new int[] {value}, byteOrder);
}
public static ExifAttribute createByte(String value) {
// Exception for GPSAltitudeRef tag
if (value.length() == 1 && value.charAt(0) >= '0' && value.charAt(0) <= '1') {
final byte[] bytes = new byte[] { (byte) (value.charAt(0) - '0') };
return new ExifAttribute(IFD_FORMAT_BYTE, bytes.length, bytes);
}
final byte[] ascii = value.getBytes(ASCII);
return new ExifAttribute(IFD_FORMAT_BYTE, ascii.length, ascii);
}
public static ExifAttribute createString(String value) {
final byte[] ascii = (value + '\0').getBytes(ASCII);
return new ExifAttribute(IFD_FORMAT_STRING, ascii.length, ascii);
}
public static ExifAttribute createURational(Rational[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_URATIONAL] * values.length]);
buffer.order(byteOrder);
for (Rational value : values) {
buffer.putInt((int) value.numerator);
buffer.putInt((int) value.denominator);
}
return new ExifAttribute(IFD_FORMAT_URATIONAL, values.length, buffer.array());
}
public static ExifAttribute createURational(Rational value, ByteOrder byteOrder) {
return createURational(new Rational[] {value}, byteOrder);
}
public static ExifAttribute createSRational(Rational[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_SRATIONAL] * values.length]);
buffer.order(byteOrder);
for (Rational value : values) {
buffer.putInt((int) value.numerator);
buffer.putInt((int) value.denominator);
}
return new ExifAttribute(IFD_FORMAT_SRATIONAL, values.length, buffer.array());
}
public static ExifAttribute createSRational(Rational value, ByteOrder byteOrder) {
return createSRational(new Rational[] {value}, byteOrder);
}
public static ExifAttribute createDouble(double[] values, ByteOrder byteOrder) {
final ByteBuffer buffer = ByteBuffer.wrap(
new byte[IFD_FORMAT_BYTES_PER_FORMAT[IFD_FORMAT_DOUBLE] * values.length]);
buffer.order(byteOrder);
for (double value : values) {
buffer.putDouble(value);
}
return new ExifAttribute(IFD_FORMAT_DOUBLE, values.length, buffer.array());
}
public static ExifAttribute createDouble(double value, ByteOrder byteOrder) {
return createDouble(new double[] {value}, byteOrder);
}
@Override
public String toString() {
return "(" + IFD_FORMAT_NAMES[format] + ", data length:" + bytes.length + ")";
}
private Object getValue(ByteOrder byteOrder) {
try {
ByteOrderedDataInputStream inputStream =
new ByteOrderedDataInputStream(bytes);
inputStream.setByteOrder(byteOrder);
switch (format) {
case IFD_FORMAT_BYTE:
case IFD_FORMAT_SBYTE: {
// Exception for GPSAltitudeRef tag
if (bytes.length == 1 && bytes[0] >= 0 && bytes[0] <= 1) {
return new String(new char[] { (char) (bytes[0] + '0') });
}
return new String(bytes, ASCII);
}
case IFD_FORMAT_UNDEFINED:
case IFD_FORMAT_STRING: {
int index = 0;
if (numberOfComponents >= EXIF_ASCII_PREFIX.length) {
boolean same = true;
for (int i = 0; i < EXIF_ASCII_PREFIX.length; ++i) {
if (bytes[i] != EXIF_ASCII_PREFIX[i]) {
same = false;
break;
}
}
if (same) {
index = EXIF_ASCII_PREFIX.length;
}
}
StringBuilder stringBuilder = new StringBuilder();
while (index < numberOfComponents) {
int ch = bytes[index];
if (ch == 0) {
break;
}
if (ch >= 32) {
stringBuilder.append((char) ch);
} else {
stringBuilder.append('?');
}
++index;
}
return stringBuilder.toString();
}
case IFD_FORMAT_USHORT: {
final int[] values = new int[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readUnsignedShort();
}
return values;
}
case IFD_FORMAT_ULONG: {
final long[] values = new long[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readUnsignedInt();
}
return values;
}
case IFD_FORMAT_URATIONAL: {
final Rational[] values = new Rational[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
final long numerator = inputStream.readUnsignedInt();
final long denominator = inputStream.readUnsignedInt();
values[i] = new Rational(numerator, denominator);
}
return values;
}
case IFD_FORMAT_SSHORT: {
final int[] values = new int[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readShort();
}
return values;
}
case IFD_FORMAT_SLONG: {
final int[] values = new int[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readInt();
}
return values;
}
case IFD_FORMAT_SRATIONAL: {
final Rational[] values = new Rational[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
final long numerator = inputStream.readInt();
final long denominator = inputStream.readInt();
values[i] = new Rational(numerator, denominator);
}
return values;
}
case IFD_FORMAT_SINGLE: {
final double[] values = new double[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readFloat();
}
return values;
}
case IFD_FORMAT_DOUBLE: {
final double[] values = new double[numberOfComponents];
for (int i = 0; i < numberOfComponents; ++i) {
values[i] = inputStream.readDouble();
}
return values;
}
default:
return null;
}
} catch (IOException e) {
Log.w(TAG, "IOException occurred during reading a value", e);
return null;
}
}
public double getDoubleValue(ByteOrder byteOrder) {
Object value = getValue(byteOrder);
if (value == null) {
throw new NumberFormatException("NULL can't be converted to a double value");
}
if (value instanceof String) {
return Double.parseDouble((String) value);
}
if (value instanceof long[]) {
long[] array = (long[]) value;
if (array.length == 1) {
return array[0];
}
throw new NumberFormatException("There are more than one component");
}
if (value instanceof int[]) {
int[] array = (int[]) value;
if (array.length == 1) {
return array[0];
}
throw new NumberFormatException("There are more than one component");
}
if (value instanceof double[]) {
double[] array = (double[]) value;
if (array.length == 1) {
return array[0];
}
throw new NumberFormatException("There are more than one component");
}
if (value instanceof Rational[]) {
Rational[] array = (Rational[]) value;
if (array.length == 1) {
return array[0].calculate();
}
throw new NumberFormatException("There are more than one component");
}
throw new NumberFormatException("Couldn't find a double value");
}
public int getIntValue(ByteOrder byteOrder) {
Object value = getValue(byteOrder);
if (value == null) {
throw new NumberFormatException("NULL can't be converted to a integer value");
}
if (value instanceof String) {
return Integer.parseInt((String) value);
}
if (value instanceof long[]) {
long[] array = (long[]) value;
if (array.length == 1) {
return (int) array[0];
}
throw new NumberFormatException("There are more than one component");
}
if (value instanceof int[]) {
int[] array = (int[]) value;
if (array.length == 1) {
return array[0];
}
throw new NumberFormatException("There are more than one component");
}
throw new NumberFormatException("Couldn't find a integer value");
}
public String getStringValue(ByteOrder byteOrder) {
Object value = getValue(byteOrder);
if (value == null) {
return null;
}
if (value instanceof String) {
return (String) value;
}
final StringBuilder stringBuilder = new StringBuilder();
if (value instanceof long[]) {
long[] array = (long[]) value;
for (int i = 0; i < array.length; ++i) {
stringBuilder.append(array[i]);
if (i + 1 != array.length) {
stringBuilder.append(",");
}
}
return stringBuilder.toString();
}
if (value instanceof int[]) {
int[] array = (int[]) value;
for (int i = 0; i < array.length; ++i) {
stringBuilder.append(array[i]);
if (i + 1 != array.length) {
stringBuilder.append(",");
}
}
return stringBuilder.toString();
}
if (value instanceof double[]) {
double[] array = (double[]) value;
for (int i = 0; i < array.length; ++i) {
stringBuilder.append(array[i]);
if (i + 1 != array.length) {
stringBuilder.append(",");
}
}
return stringBuilder.toString();
}
if (value instanceof Rational[]) {
Rational[] array = (Rational[]) value;
for (int i = 0; i < array.length; ++i) {
stringBuilder.append(array[i].numerator);
stringBuilder.append('/');
stringBuilder.append(array[i].denominator);
if (i + 1 != array.length) {
stringBuilder.append(",");
}
}
return stringBuilder.toString();
}
return null;
}
public int size() {
return IFD_FORMAT_BYTES_PER_FORMAT[format] * numberOfComponents;
}
}
// A class for indicating EXIF tag.
private static class ExifTag {
public final int number;
public final String name;
public final int primaryFormat;
public final int secondaryFormat;
private ExifTag(String name, int number, int format) {
this.name = name;
this.number = number;
this.primaryFormat = format;
this.secondaryFormat = -1;
}
private ExifTag(String name, int number, int primaryFormat, int secondaryFormat) {
this.name = name;
this.number = number;
this.primaryFormat = primaryFormat;
this.secondaryFormat = secondaryFormat;
}
}
// Primary image IFD TIFF tags (See JEITA CP-3451C Section 4.6.8 Tag Support Levels)
private static final ExifTag[] IFD_TIFF_TAGS = new ExifTag[] {
// For below two, see TIFF 6.0 Spec Section 3: Bilevel Images.
new ExifTag(TAG_NEW_SUBFILE_TYPE, 254, IFD_FORMAT_ULONG),
new ExifTag(TAG_SUBFILE_TYPE, 255, IFD_FORMAT_ULONG),
new ExifTag(TAG_IMAGE_WIDTH, 256, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_IMAGE_LENGTH, 257, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_BITS_PER_SAMPLE, 258, IFD_FORMAT_USHORT),
new ExifTag(TAG_COMPRESSION, 259, IFD_FORMAT_USHORT),
new ExifTag(TAG_PHOTOMETRIC_INTERPRETATION, 262, IFD_FORMAT_USHORT),
new ExifTag(TAG_IMAGE_DESCRIPTION, 270, IFD_FORMAT_STRING),
new ExifTag(TAG_MAKE, 271, IFD_FORMAT_STRING),
new ExifTag(TAG_MODEL, 272, IFD_FORMAT_STRING),
new ExifTag(TAG_STRIP_OFFSETS, 273, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_ORIENTATION, 274, IFD_FORMAT_USHORT),
new ExifTag(TAG_SAMPLES_PER_PIXEL, 277, IFD_FORMAT_USHORT),
new ExifTag(TAG_ROWS_PER_STRIP, 278, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_STRIP_BYTE_COUNTS, 279, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_X_RESOLUTION, 282, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_Y_RESOLUTION, 283, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_PLANAR_CONFIGURATION, 284, IFD_FORMAT_USHORT),
new ExifTag(TAG_RESOLUTION_UNIT, 296, IFD_FORMAT_USHORT),
new ExifTag(TAG_TRANSFER_FUNCTION, 301, IFD_FORMAT_USHORT),
new ExifTag(TAG_SOFTWARE, 305, IFD_FORMAT_STRING),
new ExifTag(TAG_DATETIME, 306, IFD_FORMAT_STRING),
new ExifTag(TAG_ARTIST, 315, IFD_FORMAT_STRING),
new ExifTag(TAG_WHITE_POINT, 318, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_PRIMARY_CHROMATICITIES, 319, IFD_FORMAT_URATIONAL),
// See Adobe PageMaker® 6.0 TIFF Technical Notes, Note 1.
new ExifTag(TAG_SUB_IFD_POINTER, 330, IFD_FORMAT_ULONG),
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513, IFD_FORMAT_ULONG),
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514, IFD_FORMAT_ULONG),
new ExifTag(TAG_Y_CB_CR_COEFFICIENTS, 529, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_Y_CB_CR_SUB_SAMPLING, 530, IFD_FORMAT_USHORT),
new ExifTag(TAG_Y_CB_CR_POSITIONING, 531, IFD_FORMAT_USHORT),
new ExifTag(TAG_REFERENCE_BLACK_WHITE, 532, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_COPYRIGHT, 33432, IFD_FORMAT_STRING),
new ExifTag(TAG_EXIF_IFD_POINTER, 34665, IFD_FORMAT_ULONG),
new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853, IFD_FORMAT_ULONG),
// RW2 file tags
// See http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/PanasonicRaw.html)
new ExifTag(TAG_RW2_SENSOR_TOP_BORDER, 4, IFD_FORMAT_ULONG),
new ExifTag(TAG_RW2_SENSOR_LEFT_BORDER, 5, IFD_FORMAT_ULONG),
new ExifTag(TAG_RW2_SENSOR_BOTTOM_BORDER, 6, IFD_FORMAT_ULONG),
new ExifTag(TAG_RW2_SENSOR_RIGHT_BORDER, 7, IFD_FORMAT_ULONG),
new ExifTag(TAG_RW2_ISO, 23, IFD_FORMAT_USHORT),
new ExifTag(TAG_RW2_JPG_FROM_RAW, 46, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_XMP, 700, IFD_FORMAT_BYTE),
};
// Primary image IFD Exif Private tags (See JEITA CP-3451C Section 4.6.8 Tag Support Levels)
private static final ExifTag[] IFD_EXIF_TAGS = new ExifTag[] {
new ExifTag(TAG_EXPOSURE_TIME, 33434, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_F_NUMBER, 33437, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_EXPOSURE_PROGRAM, 34850, IFD_FORMAT_USHORT),
new ExifTag(TAG_SPECTRAL_SENSITIVITY, 34852, IFD_FORMAT_STRING),
new ExifTag(TAG_ISO_SPEED_RATINGS, 34855, IFD_FORMAT_USHORT),
new ExifTag(TAG_OECF, 34856, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_EXIF_VERSION, 36864, IFD_FORMAT_STRING),
new ExifTag(TAG_DATETIME_ORIGINAL, 36867, IFD_FORMAT_STRING),
new ExifTag(TAG_DATETIME_DIGITIZED, 36868, IFD_FORMAT_STRING),
new ExifTag(TAG_OFFSET_TIME, 36880, IFD_FORMAT_STRING),
new ExifTag(TAG_OFFSET_TIME_ORIGINAL, 36881, IFD_FORMAT_STRING),
new ExifTag(TAG_OFFSET_TIME_DIGITIZED, 36882, IFD_FORMAT_STRING),
new ExifTag(TAG_COMPONENTS_CONFIGURATION, 37121, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_COMPRESSED_BITS_PER_PIXEL, 37122, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_SHUTTER_SPEED_VALUE, 37377, IFD_FORMAT_SRATIONAL),
new ExifTag(TAG_APERTURE_VALUE, 37378, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_BRIGHTNESS_VALUE, 37379, IFD_FORMAT_SRATIONAL),
new ExifTag(TAG_EXPOSURE_BIAS_VALUE, 37380, IFD_FORMAT_SRATIONAL),
new ExifTag(TAG_MAX_APERTURE_VALUE, 37381, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_SUBJECT_DISTANCE, 37382, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_METERING_MODE, 37383, IFD_FORMAT_USHORT),
new ExifTag(TAG_LIGHT_SOURCE, 37384, IFD_FORMAT_USHORT),
new ExifTag(TAG_FLASH, 37385, IFD_FORMAT_USHORT),
new ExifTag(TAG_FOCAL_LENGTH, 37386, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_SUBJECT_AREA, 37396, IFD_FORMAT_USHORT),
new ExifTag(TAG_MAKER_NOTE, 37500, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_USER_COMMENT, 37510, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_SUBSEC_TIME, 37520, IFD_FORMAT_STRING),
new ExifTag(TAG_SUBSEC_TIME_ORIG, 37521, IFD_FORMAT_STRING),
new ExifTag(TAG_SUBSEC_TIME_DIG, 37522, IFD_FORMAT_STRING),
new ExifTag(TAG_FLASHPIX_VERSION, 40960, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_COLOR_SPACE, 40961, IFD_FORMAT_USHORT),
new ExifTag(TAG_PIXEL_X_DIMENSION, 40962, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_PIXEL_Y_DIMENSION, 40963, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_RELATED_SOUND_FILE, 40964, IFD_FORMAT_STRING),
new ExifTag(TAG_INTEROPERABILITY_IFD_POINTER, 40965, IFD_FORMAT_ULONG),
new ExifTag(TAG_FLASH_ENERGY, 41483, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_SPATIAL_FREQUENCY_RESPONSE, 41484, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_FOCAL_PLANE_X_RESOLUTION, 41486, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_FOCAL_PLANE_Y_RESOLUTION, 41487, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_FOCAL_PLANE_RESOLUTION_UNIT, 41488, IFD_FORMAT_USHORT),
new ExifTag(TAG_SUBJECT_LOCATION, 41492, IFD_FORMAT_USHORT),
new ExifTag(TAG_EXPOSURE_INDEX, 41493, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_SENSING_METHOD, 41495, IFD_FORMAT_USHORT),
new ExifTag(TAG_FILE_SOURCE, 41728, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_SCENE_TYPE, 41729, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_CFA_PATTERN, 41730, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_CUSTOM_RENDERED, 41985, IFD_FORMAT_USHORT),
new ExifTag(TAG_EXPOSURE_MODE, 41986, IFD_FORMAT_USHORT),
new ExifTag(TAG_WHITE_BALANCE, 41987, IFD_FORMAT_USHORT),
new ExifTag(TAG_DIGITAL_ZOOM_RATIO, 41988, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_FOCAL_LENGTH_IN_35MM_FILM, 41989, IFD_FORMAT_USHORT),
new ExifTag(TAG_SCENE_CAPTURE_TYPE, 41990, IFD_FORMAT_USHORT),
new ExifTag(TAG_GAIN_CONTROL, 41991, IFD_FORMAT_USHORT),
new ExifTag(TAG_CONTRAST, 41992, IFD_FORMAT_USHORT),
new ExifTag(TAG_SATURATION, 41993, IFD_FORMAT_USHORT),
new ExifTag(TAG_SHARPNESS, 41994, IFD_FORMAT_USHORT),
new ExifTag(TAG_DEVICE_SETTING_DESCRIPTION, 41995, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_SUBJECT_DISTANCE_RANGE, 41996, IFD_FORMAT_USHORT),
new ExifTag(TAG_IMAGE_UNIQUE_ID, 42016, IFD_FORMAT_STRING),
new ExifTag(TAG_DNG_VERSION, 50706, IFD_FORMAT_BYTE),
new ExifTag(TAG_DEFAULT_CROP_SIZE, 50720, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG)
};
// Primary image IFD GPS Info tags (See JEITA CP-3451C Section 4.6.8 Tag Support Levels)
private static final ExifTag[] IFD_GPS_TAGS = new ExifTag[] {
new ExifTag(TAG_GPS_VERSION_ID, 0, IFD_FORMAT_BYTE),
new ExifTag(TAG_GPS_LATITUDE_REF, 1, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_LATITUDE, 2, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_LONGITUDE_REF, 3, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_LONGITUDE, 4, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_ALTITUDE_REF, 5, IFD_FORMAT_BYTE),
new ExifTag(TAG_GPS_ALTITUDE, 6, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_TIMESTAMP, 7, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_SATELLITES, 8, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_STATUS, 9, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_MEASURE_MODE, 10, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DOP, 11, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_SPEED_REF, 12, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_SPEED, 13, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_TRACK_REF, 14, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_TRACK, 15, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_IMG_DIRECTION_REF, 16, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_IMG_DIRECTION, 17, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_MAP_DATUM, 18, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DEST_LATITUDE_REF, 19, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DEST_LATITUDE, 20, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_DEST_LONGITUDE_REF, 21, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DEST_LONGITUDE, 22, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_DEST_BEARING_REF, 23, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DEST_BEARING, 24, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_DEST_DISTANCE_REF, 25, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DEST_DISTANCE, 26, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_GPS_PROCESSING_METHOD, 27, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_GPS_AREA_INFORMATION, 28, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_GPS_DATESTAMP, 29, IFD_FORMAT_STRING),
new ExifTag(TAG_GPS_DIFFERENTIAL, 30, IFD_FORMAT_USHORT)
};
// Primary image IFD Interoperability tag (See JEITA CP-3451C Section 4.6.8 Tag Support Levels)
private static final ExifTag[] IFD_INTEROPERABILITY_TAGS = new ExifTag[] {
new ExifTag(TAG_INTEROPERABILITY_INDEX, 1, IFD_FORMAT_STRING)
};
// IFD Thumbnail tags (See JEITA CP-3451C Section 4.6.8 Tag Support Levels)
private static final ExifTag[] IFD_THUMBNAIL_TAGS = new ExifTag[] {
// For below two, see TIFF 6.0 Spec Section 3: Bilevel Images.
new ExifTag(TAG_NEW_SUBFILE_TYPE, 254, IFD_FORMAT_ULONG),
new ExifTag(TAG_SUBFILE_TYPE, 255, IFD_FORMAT_ULONG),
new ExifTag(TAG_THUMBNAIL_IMAGE_WIDTH, 256, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_THUMBNAIL_IMAGE_LENGTH, 257, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_BITS_PER_SAMPLE, 258, IFD_FORMAT_USHORT),
new ExifTag(TAG_COMPRESSION, 259, IFD_FORMAT_USHORT),
new ExifTag(TAG_PHOTOMETRIC_INTERPRETATION, 262, IFD_FORMAT_USHORT),
new ExifTag(TAG_IMAGE_DESCRIPTION, 270, IFD_FORMAT_STRING),
new ExifTag(TAG_MAKE, 271, IFD_FORMAT_STRING),
new ExifTag(TAG_MODEL, 272, IFD_FORMAT_STRING),
new ExifTag(TAG_STRIP_OFFSETS, 273, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_ORIENTATION, 274, IFD_FORMAT_USHORT),
new ExifTag(TAG_SAMPLES_PER_PIXEL, 277, IFD_FORMAT_USHORT),
new ExifTag(TAG_ROWS_PER_STRIP, 278, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_STRIP_BYTE_COUNTS, 279, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG),
new ExifTag(TAG_X_RESOLUTION, 282, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_Y_RESOLUTION, 283, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_PLANAR_CONFIGURATION, 284, IFD_FORMAT_USHORT),
new ExifTag(TAG_RESOLUTION_UNIT, 296, IFD_FORMAT_USHORT),
new ExifTag(TAG_TRANSFER_FUNCTION, 301, IFD_FORMAT_USHORT),
new ExifTag(TAG_SOFTWARE, 305, IFD_FORMAT_STRING),
new ExifTag(TAG_DATETIME, 306, IFD_FORMAT_STRING),
new ExifTag(TAG_ARTIST, 315, IFD_FORMAT_STRING),
new ExifTag(TAG_WHITE_POINT, 318, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_PRIMARY_CHROMATICITIES, 319, IFD_FORMAT_URATIONAL),
// See Adobe PageMaker® 6.0 TIFF Technical Notes, Note 1.
new ExifTag(TAG_SUB_IFD_POINTER, 330, IFD_FORMAT_ULONG),
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513, IFD_FORMAT_ULONG),
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514, IFD_FORMAT_ULONG),
new ExifTag(TAG_Y_CB_CR_COEFFICIENTS, 529, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_Y_CB_CR_SUB_SAMPLING, 530, IFD_FORMAT_USHORT),
new ExifTag(TAG_Y_CB_CR_POSITIONING, 531, IFD_FORMAT_USHORT),
new ExifTag(TAG_REFERENCE_BLACK_WHITE, 532, IFD_FORMAT_URATIONAL),
new ExifTag(TAG_COPYRIGHT, 33432, IFD_FORMAT_STRING),
new ExifTag(TAG_EXIF_IFD_POINTER, 34665, IFD_FORMAT_ULONG),
new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853, IFD_FORMAT_ULONG),
new ExifTag(TAG_DNG_VERSION, 50706, IFD_FORMAT_BYTE),
new ExifTag(TAG_DEFAULT_CROP_SIZE, 50720, IFD_FORMAT_USHORT, IFD_FORMAT_ULONG)
};
// RAF file tag (See piex.cc line 372)
private static final ExifTag TAG_RAF_IMAGE_SIZE =
new ExifTag(TAG_STRIP_OFFSETS, 273, IFD_FORMAT_USHORT);
// ORF file tags (See http://www.exiv2.org/tags-olympus.html)
private static final ExifTag[] ORF_MAKER_NOTE_TAGS = new ExifTag[] {
new ExifTag(TAG_ORF_THUMBNAIL_IMAGE, 256, IFD_FORMAT_UNDEFINED),
new ExifTag(TAG_ORF_CAMERA_SETTINGS_IFD_POINTER, 8224, IFD_FORMAT_ULONG),
new ExifTag(TAG_ORF_IMAGE_PROCESSING_IFD_POINTER, 8256, IFD_FORMAT_ULONG)
};
private static final ExifTag[] ORF_CAMERA_SETTINGS_TAGS = new ExifTag[] {
new ExifTag(TAG_ORF_PREVIEW_IMAGE_START, 257, IFD_FORMAT_ULONG),
new ExifTag(TAG_ORF_PREVIEW_IMAGE_LENGTH, 258, IFD_FORMAT_ULONG)
};
private static final ExifTag[] ORF_IMAGE_PROCESSING_TAGS = new ExifTag[] {
new ExifTag(TAG_ORF_ASPECT_FRAME, 4371, IFD_FORMAT_USHORT)
};
// PEF file tag (See http://www.sno.phy.queensu.ca/~phil/exiftool/TagNames/Pentax.html)
private static final ExifTag[] PEF_TAGS = new ExifTag[] {
new ExifTag(TAG_COLOR_SPACE, 55, IFD_FORMAT_USHORT)
};
// See JEITA CP-3451C Section 4.6.3: Exif-specific IFD.
// The following values are used for indicating pointers to the other Image File Directories.
// Indices of Exif Ifd tag groups
/** @hide */
@Retention(RetentionPolicy.SOURCE)
@IntDef({IFD_TYPE_PRIMARY, IFD_TYPE_EXIF, IFD_TYPE_GPS, IFD_TYPE_INTEROPERABILITY,
IFD_TYPE_THUMBNAIL, IFD_TYPE_PREVIEW, IFD_TYPE_ORF_MAKER_NOTE,
IFD_TYPE_ORF_CAMERA_SETTINGS, IFD_TYPE_ORF_IMAGE_PROCESSING, IFD_TYPE_PEF})
public @interface IfdType {}
private static final int IFD_TYPE_PRIMARY = 0;
private static final int IFD_TYPE_EXIF = 1;
private static final int IFD_TYPE_GPS = 2;
private static final int IFD_TYPE_INTEROPERABILITY = 3;
private static final int IFD_TYPE_THUMBNAIL = 4;
private static final int IFD_TYPE_PREVIEW = 5;
private static final int IFD_TYPE_ORF_MAKER_NOTE = 6;
private static final int IFD_TYPE_ORF_CAMERA_SETTINGS = 7;
private static final int IFD_TYPE_ORF_IMAGE_PROCESSING = 8;
private static final int IFD_TYPE_PEF = 9;
// List of Exif tag groups
private static final ExifTag[][] EXIF_TAGS = new ExifTag[][] {
IFD_TIFF_TAGS, IFD_EXIF_TAGS, IFD_GPS_TAGS, IFD_INTEROPERABILITY_TAGS,
IFD_THUMBNAIL_TAGS, IFD_TIFF_TAGS, ORF_MAKER_NOTE_TAGS, ORF_CAMERA_SETTINGS_TAGS,
ORF_IMAGE_PROCESSING_TAGS, PEF_TAGS
};
// List of tags for pointing to the other image file directory offset.
private static final ExifTag[] EXIF_POINTER_TAGS = new ExifTag[] {
new ExifTag(TAG_SUB_IFD_POINTER, 330, IFD_FORMAT_ULONG),
new ExifTag(TAG_EXIF_IFD_POINTER, 34665, IFD_FORMAT_ULONG),
new ExifTag(TAG_GPS_INFO_IFD_POINTER, 34853, IFD_FORMAT_ULONG),
new ExifTag(TAG_INTEROPERABILITY_IFD_POINTER, 40965, IFD_FORMAT_ULONG),
new ExifTag(TAG_ORF_CAMERA_SETTINGS_IFD_POINTER, 8224, IFD_FORMAT_BYTE),
new ExifTag(TAG_ORF_IMAGE_PROCESSING_IFD_POINTER, 8256, IFD_FORMAT_BYTE)
};
// Tags for indicating the thumbnail offset and length
private static final ExifTag JPEG_INTERCHANGE_FORMAT_TAG =
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT, 513, IFD_FORMAT_ULONG);
private static final ExifTag JPEG_INTERCHANGE_FORMAT_LENGTH_TAG =
new ExifTag(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH, 514, IFD_FORMAT_ULONG);
// Mappings from tag number to tag name and each item represents one IFD tag group.
private static final HashMap[] sExifTagMapsForReading = new HashMap[EXIF_TAGS.length];
// Mappings from tag name to tag number and each item represents one IFD tag group.
private static final HashMap[] sExifTagMapsForWriting = new HashMap[EXIF_TAGS.length];
private static final HashSet<String> sTagSetForCompatibility = new HashSet<>(Arrays.asList(
TAG_F_NUMBER, TAG_DIGITAL_ZOOM_RATIO, TAG_EXPOSURE_TIME, TAG_SUBJECT_DISTANCE,
TAG_GPS_TIMESTAMP));
// Mappings from tag number to IFD type for pointer tags.
private static final HashMap<Integer, Integer> sExifPointerTagMap = new HashMap();
// See JPEG File Interchange Format Version 1.02.
// The following values are defined for handling JPEG streams. In this implementation, we are
// not only getting information from EXIF but also from some JPEG special segments such as
// MARKER_COM for user comment and MARKER_SOFx for image width and height.
private static final Charset ASCII = Charset.forName("US-ASCII");
// Identifier for EXIF APP1 segment in JPEG
private static final byte[] IDENTIFIER_EXIF_APP1 = "Exif\0\0".getBytes(ASCII);
// Identifier for XMP APP1 segment in JPEG
private static final byte[] IDENTIFIER_XMP_APP1 = "http://ns.adobe.com/xap/1.0/\0".getBytes(ASCII);
// JPEG segment markers, that each marker consumes two bytes beginning with 0xff and ending with
// the indicator. There is no SOF4, SOF8, SOF16 markers in JPEG and SOFx markers indicates start
// of frame(baseline DCT) and the image size info exists in its beginning part.
private static final byte MARKER = (byte) 0xff;
private static final byte MARKER_SOI = (byte) 0xd8;
private static final byte MARKER_SOF0 = (byte) 0xc0;
private static final byte MARKER_SOF1 = (byte) 0xc1;
private static final byte MARKER_SOF2 = (byte) 0xc2;
private static final byte MARKER_SOF3 = (byte) 0xc3;
private static final byte MARKER_SOF5 = (byte) 0xc5;
private static final byte MARKER_SOF6 = (byte) 0xc6;
private static final byte MARKER_SOF7 = (byte) 0xc7;
private static final byte MARKER_SOF9 = (byte) 0xc9;
private static final byte MARKER_SOF10 = (byte) 0xca;
private static final byte MARKER_SOF11 = (byte) 0xcb;
private static final byte MARKER_SOF13 = (byte) 0xcd;
private static final byte MARKER_SOF14 = (byte) 0xce;
private static final byte MARKER_SOF15 = (byte) 0xcf;
private static final byte MARKER_SOS = (byte) 0xda;
private static final byte MARKER_APP1 = (byte) 0xe1;
private static final byte MARKER_COM = (byte) 0xfe;
private static final byte MARKER_EOI = (byte) 0xd9;
// Supported Image File Types
private static final int IMAGE_TYPE_UNKNOWN = 0;
private static final int IMAGE_TYPE_ARW = 1;
private static final int IMAGE_TYPE_CR2 = 2;
private static final int IMAGE_TYPE_DNG = 3;
private static final int IMAGE_TYPE_JPEG = 4;
private static final int IMAGE_TYPE_NEF = 5;
private static final int IMAGE_TYPE_NRW = 6;
private static final int IMAGE_TYPE_ORF = 7;
private static final int IMAGE_TYPE_PEF = 8;
private static final int IMAGE_TYPE_RAF = 9;
private static final int IMAGE_TYPE_RW2 = 10;
private static final int IMAGE_TYPE_SRW = 11;
private static final int IMAGE_TYPE_HEIF = 12;
static {
sFormatter = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss");
sFormatter.setTimeZone(TimeZone.getTimeZone("UTC"));
sFormatterTz = new SimpleDateFormat("yyyy:MM:dd HH:mm:ss XXX");
sFormatterTz.setTimeZone(TimeZone.getTimeZone("UTC"));
// Build up the hash tables to look up Exif tags for reading Exif tags.
for (int ifdType = 0; ifdType < EXIF_TAGS.length; ++ifdType) {
sExifTagMapsForReading[ifdType] = new HashMap();
sExifTagMapsForWriting[ifdType] = new HashMap();
for (ExifTag tag : EXIF_TAGS[ifdType]) {
sExifTagMapsForReading[ifdType].put(tag.number, tag);
sExifTagMapsForWriting[ifdType].put(tag.name, tag);
}
}
// Build up the hash table to look up Exif pointer tags.
sExifPointerTagMap.put(EXIF_POINTER_TAGS[0].number, IFD_TYPE_PREVIEW); // 330
sExifPointerTagMap.put(EXIF_POINTER_TAGS[1].number, IFD_TYPE_EXIF); // 34665
sExifPointerTagMap.put(EXIF_POINTER_TAGS[2].number, IFD_TYPE_GPS); // 34853
sExifPointerTagMap.put(EXIF_POINTER_TAGS[3].number, IFD_TYPE_INTEROPERABILITY); // 40965
sExifPointerTagMap.put(EXIF_POINTER_TAGS[4].number, IFD_TYPE_ORF_CAMERA_SETTINGS); // 8224
sExifPointerTagMap.put(EXIF_POINTER_TAGS[5].number, IFD_TYPE_ORF_IMAGE_PROCESSING); // 8256
}
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
private String mFilename;
private FileDescriptor mSeekableFileDescriptor;
private AssetManager.AssetInputStream mAssetInputStream;
private boolean mIsInputStream;
private int mMimeType;
@UnsupportedAppUsage
private final HashMap[] mAttributes = new HashMap[EXIF_TAGS.length];
private Set<Integer> mHandledIfdOffsets = new HashSet<>(EXIF_TAGS.length);
private ByteOrder mExifByteOrder = ByteOrder.BIG_ENDIAN;
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
private boolean mHasThumbnail;
// The following values used for indicating a thumbnail position.
private int mThumbnailOffset;
private int mThumbnailLength;
private byte[] mThumbnailBytes;
private int mThumbnailCompression;
private int mExifOffset;
private int mOrfMakerNoteOffset;
private int mOrfThumbnailOffset;
private int mOrfThumbnailLength;
private int mRw2JpgFromRawOffset;
private boolean mIsSupportedFile;
private boolean mModified;
// Pattern to check non zero timestamp
private static final Pattern sNonZeroTimePattern = Pattern.compile(".*[1-9].*");
// Pattern to check gps timestamp
private static final Pattern sGpsTimestampPattern =
Pattern.compile("^([0-9][0-9]):([0-9][0-9]):([0-9][0-9])$");
/**
* Reads Exif tags from the specified image file.
*/
public ExifInterface(@NonNull File file) throws IOException {
if (file == null) {
throw new NullPointerException("file cannot be null");
}
initForFilename(file.getAbsolutePath());
}
/**
* Reads Exif tags from the specified image file.
*/
public ExifInterface(@NonNull String filename) throws IOException {
if (filename == null) {
throw new NullPointerException("filename cannot be null");
}
initForFilename(filename);
}
/**
* Reads Exif tags from the specified image file descriptor. Attribute mutation is supported
* for writable and seekable file descriptors only. This constructor will not rewind the offset
* of the given file descriptor. Developers should close the file descriptor after use.
*/
public ExifInterface(@NonNull FileDescriptor fileDescriptor) throws IOException {
if (fileDescriptor == null) {
throw new NullPointerException("fileDescriptor cannot be null");
}
mAssetInputStream = null;
mFilename = null;
if (isSeekableFD(fileDescriptor)) {
mSeekableFileDescriptor = fileDescriptor;
// Keep the original file descriptor in order to save attributes when it's seekable.
// Otherwise, just close the given file descriptor after reading it because the save
// feature won't be working.
try {
fileDescriptor = Os.dup(fileDescriptor);
} catch (ErrnoException e) {
throw e.rethrowAsIOException();
}
} else {
mSeekableFileDescriptor = null;
}
mIsInputStream = false;
FileInputStream in = null;
try {
in = new FileInputStream(fileDescriptor);
loadAttributes(in);
} finally {
IoUtils.closeQuietly(in);
}
}
/**
* Reads Exif tags from the specified image input stream. Attribute mutation is not supported
* for input streams. The given input stream will proceed its current position. Developers
* should close the input stream after use.
*/
public ExifInterface(@NonNull InputStream inputStream) throws IOException {
if (inputStream == null) {
throw new NullPointerException("inputStream cannot be null");
}
mFilename = null;
if (inputStream instanceof AssetManager.AssetInputStream) {
mAssetInputStream = (AssetManager.AssetInputStream) inputStream;
mSeekableFileDescriptor = null;
} else if (inputStream instanceof FileInputStream
&& isSeekableFD(((FileInputStream) inputStream).getFD())) {
mAssetInputStream = null;
mSeekableFileDescriptor = ((FileInputStream) inputStream).getFD();
} else {
mAssetInputStream = null;
mSeekableFileDescriptor = null;
}
mIsInputStream = true;
loadAttributes(inputStream);
}
/**
* Returns the EXIF attribute of the specified tag or {@code null} if there is no such tag in
* the image file.
*
* @param tag the name of the tag.
*/
private @Nullable ExifAttribute getExifAttribute(@NonNull String tag) {
if (tag == null) {
throw new NullPointerException("tag shouldn't be null");
}
// Retrieves all tag groups. The value from primary image tag group has a higher priority
// than the value from the thumbnail tag group if there are more than one candidates.
for (int i = 0; i < EXIF_TAGS.length; ++i) {
Object value = mAttributes[i].get(tag);
if (value != null) {
return (ExifAttribute) value;
}
}
return null;
}
/**
* Returns the value of the specified tag or {@code null} if there
* is no such tag in the image file.
*
* @param tag the name of the tag.
*/
public @Nullable String getAttribute(@NonNull String tag) {
if (tag == null) {
throw new NullPointerException("tag shouldn't be null");
}
ExifAttribute attribute = getExifAttribute(tag);
if (attribute != null) {
if (!sTagSetForCompatibility.contains(tag)) {
return attribute.getStringValue(mExifByteOrder);
}
if (tag.equals(TAG_GPS_TIMESTAMP)) {
// Convert the rational values to the custom formats for backwards compatibility.
if (attribute.format != IFD_FORMAT_URATIONAL
&& attribute.format != IFD_FORMAT_SRATIONAL) {
return null;
}
Rational[] array = (Rational[]) attribute.getValue(mExifByteOrder);
if (array.length != 3) {
return null;
}
return String.format("%02d:%02d:%02d",
(int) ((float) array[0].numerator / array[0].denominator),
(int) ((float) array[1].numerator / array[1].denominator),
(int) ((float) array[2].numerator / array[2].denominator));
}
try {
return Double.toString(attribute.getDoubleValue(mExifByteOrder));
} catch (NumberFormatException e) {
return null;
}
}
return null;
}
/**
* Returns the integer value of the specified tag. If there is no such tag
* in the image file or the value cannot be parsed as integer, return
* <var>defaultValue</var>.
*
* @param tag the name of the tag.
* @param defaultValue the value to return if the tag is not available.
*/
public int getAttributeInt(@NonNull String tag, int defaultValue) {
if (tag == null) {
throw new NullPointerException("tag shouldn't be null");
}
ExifAttribute exifAttribute = getExifAttribute(tag);
if (exifAttribute == null) {
return defaultValue;
}
try {
return exifAttribute.getIntValue(mExifByteOrder);
} catch (NumberFormatException e) {
return defaultValue;
}
}
/**
* Returns the double value of the tag that is specified as rational or contains a
* double-formatted value. If there is no such tag in the image file or the value cannot be
* parsed as double, return <var>defaultValue</var>.
*
* @param tag the name of the tag.
* @param defaultValue the value to return if the tag is not available.
*/
public double getAttributeDouble(@NonNull String tag, double defaultValue) {
if (tag == null) {
throw new NullPointerException("tag shouldn't be null");
}
ExifAttribute exifAttribute = getExifAttribute(tag);
if (exifAttribute == null) {
return defaultValue;
}
try {
return exifAttribute.getDoubleValue(mExifByteOrder);
} catch (NumberFormatException e) {
return defaultValue;
}
}
/**
* Set the value of the specified tag.
*
* @param tag the name of the tag.
* @param value the value of the tag.
*/
public void setAttribute(@NonNull String tag, @Nullable String value) {
if (tag == null) {
throw new NullPointerException("tag shouldn't be null");
}
// Convert the given value to rational values for backwards compatibility.
if (value != null && sTagSetForCompatibility.contains(tag)) {
if (tag.equals(TAG_GPS_TIMESTAMP)) {
Matcher m = sGpsTimestampPattern.matcher(value);
if (!m.find()) {
Log.w(TAG, "Invalid value for " + tag + " : " + value);
return;
}
value = Integer.parseInt(m.group(1)) + "/1," + Integer.parseInt(m.group(2)) + "/1,"
+ Integer.parseInt(m.group(3)) + "/1";
} else {
try {
double doubleValue = Double.parseDouble(value);
value = (long) (doubleValue * 10000L) + "/10000";
} catch (NumberFormatException e) {
Log.w(TAG, "Invalid value for " + tag + " : " + value);
return;
}
}
}
for (int i = 0 ; i < EXIF_TAGS.length; ++i) {
if (i == IFD_TYPE_THUMBNAIL && !mHasThumbnail) {
continue;
}
final Object obj = sExifTagMapsForWriting[i].get(tag);
if (obj != null) {
if (value == null) {
mAttributes[i].remove(tag);
continue;
}
final ExifTag exifTag = (ExifTag) obj;
Pair<Integer, Integer> guess = guessDataFormat(value);
int dataFormat;
if (exifTag.primaryFormat == guess.first || exifTag.primaryFormat == guess.second) {
dataFormat = exifTag.primaryFormat;
} else if (exifTag.secondaryFormat != -1 && (exifTag.secondaryFormat == guess.first
|| exifTag.secondaryFormat == guess.second)) {
dataFormat = exifTag.secondaryFormat;
} else if (exifTag.primaryFormat == IFD_FORMAT_BYTE
|| exifTag.primaryFormat == IFD_FORMAT_UNDEFINED
|| exifTag.primaryFormat == IFD_FORMAT_STRING) {
dataFormat = exifTag.primaryFormat;
} else {
if (DEBUG) {
Log.d(TAG, "Given tag (" + tag
+ ") value didn't match with one of expected "
+ "formats: " + IFD_FORMAT_NAMES[exifTag.primaryFormat]
+ (exifTag.secondaryFormat == -1 ? "" : ", "
+ IFD_FORMAT_NAMES[exifTag.secondaryFormat]) + " (guess: "
+ IFD_FORMAT_NAMES[guess.first] + (guess.second == -1 ? "" : ", "
+ IFD_FORMAT_NAMES[guess.second]) + ")");
}
continue;
}
switch (dataFormat) {
case IFD_FORMAT_BYTE: {
mAttributes[i].put(tag, ExifAttribute.createByte(value));
break;
}
case IFD_FORMAT_UNDEFINED:
case IFD_FORMAT_STRING: {
mAttributes[i].put(tag, ExifAttribute.createString(value));
break;
}
case IFD_FORMAT_USHORT: {
final String[] values = value.split(",");
final int[] intArray = new int[values.length];
for (int j = 0; j < values.length; ++j) {
intArray[j] = Integer.parseInt(values[j]);
}
mAttributes[i].put(tag,
ExifAttribute.createUShort(intArray, mExifByteOrder));
break;
}
case IFD_FORMAT_SLONG: {
final String[] values = value.split(",");
final int[] intArray = new int[values.length];
for (int j = 0; j < values.length; ++j) {
intArray[j] = Integer.parseInt(values[j]);
}
mAttributes[i].put(tag,
ExifAttribute.createSLong(intArray, mExifByteOrder));
break;
}
case IFD_FORMAT_ULONG: {
final String[] values = value.split(",");
final long[] longArray = new long[values.length];
for (int j = 0; j < values.length; ++j) {
longArray[j] = Long.parseLong(values[j]);
}
mAttributes[i].put(tag,
ExifAttribute.createULong(longArray, mExifByteOrder));
break;
}
case IFD_FORMAT_URATIONAL: {
final String[] values = value.split(",");
final Rational[] rationalArray = new Rational[values.length];
for (int j = 0; j < values.length; ++j) {
final String[] numbers = values[j].split("/");
rationalArray[j] = new Rational((long) Double.parseDouble(numbers[0]),
(long) Double.parseDouble(numbers[1]));
}
mAttributes[i].put(tag,
ExifAttribute.createURational(rationalArray, mExifByteOrder));
break;
}
case IFD_FORMAT_SRATIONAL: {
final String[] values = value.split(",");
final Rational[] rationalArray = new Rational[values.length];
for (int j = 0; j < values.length; ++j) {
final String[] numbers = values[j].split("/");
rationalArray[j] = new Rational((long) Double.parseDouble(numbers[0]),
(long) Double.parseDouble(numbers[1]));
}
mAttributes[i].put(tag,
ExifAttribute.createSRational(rationalArray, mExifByteOrder));
break;
}
case IFD_FORMAT_DOUBLE: {
final String[] values = value.split(",");
final double[] doubleArray = new double[values.length];
for (int j = 0; j < values.length; ++j) {
doubleArray[j] = Double.parseDouble(values[j]);
}
mAttributes[i].put(tag,
ExifAttribute.createDouble(doubleArray, mExifByteOrder));
break;
}
default:
if (DEBUG) {
Log.d(TAG, "Data format isn't one of expected formats: " + dataFormat);
}
continue;
}
}
}
}
/**
* Update the values of the tags in the tag groups if any value for the tag already was stored.
*
* @param tag the name of the tag.
* @param value the value of the tag in a form of {@link ExifAttribute}.
* @return Returns {@code true} if updating is placed.
*/
private boolean updateAttribute(String tag, ExifAttribute value) {
boolean updated = false;
for (int i = 0 ; i < EXIF_TAGS.length; ++i) {
if (mAttributes[i].containsKey(tag)) {
mAttributes[i].put(tag, value);
updated = true;
}
}
return updated;
}
/**
* Remove any values of the specified tag.
*
* @param tag the name of the tag.
*/
private void removeAttribute(String tag) {
for (int i = 0 ; i < EXIF_TAGS.length; ++i) {
mAttributes[i].remove(tag);
}
}
/**
* This function decides which parser to read the image data according to the given input stream
* type and the content of the input stream. In each case, it reads the first three bytes to
* determine whether the image data format is JPEG or not.
*/
private void loadAttributes(@NonNull InputStream in) throws IOException {
if (in == null) {
throw new NullPointerException("inputstream shouldn't be null");
}
try {
// Initialize mAttributes.
for (int i = 0; i < EXIF_TAGS.length; ++i) {
mAttributes[i] = new HashMap();
}
// Check file type
in = new BufferedInputStream(in, SIGNATURE_CHECK_SIZE);
mMimeType = getMimeType((BufferedInputStream) in);
// Create byte-ordered input stream
ByteOrderedDataInputStream inputStream = new ByteOrderedDataInputStream(in);
switch (mMimeType) {
case IMAGE_TYPE_JPEG: {
getJpegAttributes(inputStream, 0, IFD_TYPE_PRIMARY); // 0 is offset
break;
}
case IMAGE_TYPE_RAF: {
getRafAttributes(inputStream);
break;
}
case IMAGE_TYPE_HEIF: {
getHeifAttributes(inputStream);
break;
}
case IMAGE_TYPE_ORF: {
getOrfAttributes(inputStream);
break;
}
case IMAGE_TYPE_RW2: {
getRw2Attributes(inputStream);
break;
}
case IMAGE_TYPE_ARW:
case IMAGE_TYPE_CR2:
case IMAGE_TYPE_DNG:
case IMAGE_TYPE_NEF:
case IMAGE_TYPE_NRW:
case IMAGE_TYPE_PEF:
case IMAGE_TYPE_SRW:
case IMAGE_TYPE_UNKNOWN: {
getRawAttributes(inputStream);
break;
}
default: {
break;
}
}
// Set thumbnail image offset and length
setThumbnailData(inputStream);
mIsSupportedFile = true;
} catch (IOException e) {
// Ignore exceptions in order to keep the compatibility with the old versions of
// ExifInterface.
mIsSupportedFile = false;
if (DEBUG) {
Log.d(TAG, "Invalid image: ExifInterface got an unsupported image format file"
+ "(ExifInterface supports JPEG and some RAW image formats only) "
+ "or a corrupted JPEG file to ExifInterface.", e);
}
} finally {
addDefaultValuesForCompatibility();
if (DEBUG) {
printAttributes();
}
}
}
private static boolean isSeekableFD(FileDescriptor fd) throws IOException {
try {
Os.lseek(fd, 0, OsConstants.SEEK_CUR);
return true;
} catch (ErrnoException e) {
return false;
}
}
// Prints out attributes for debugging.
private void printAttributes() {
for (int i = 0; i < mAttributes.length; ++i) {
Log.d(TAG, "The size of tag group[" + i + "]: " + mAttributes[i].size());
for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) {
final ExifAttribute tagValue = (ExifAttribute) entry.getValue();
Log.d(TAG, "tagName: " + entry.getKey() + ", tagType: " + tagValue.toString()
+ ", tagValue: '" + tagValue.getStringValue(mExifByteOrder) + "'");
}
}
}
/**
* Save the tag data into the original image file. This is expensive because
* it involves copying all the data from one file to another and deleting
* the old file and renaming the other. It's best to use
* {@link #setAttribute(String,String)} to set all attributes to write and
* make a single call rather than multiple calls for each attribute.
* <p>
* This method is only supported for JPEG files.
* <p class="note">
* Note: after calling this method, any attempts to obtain range information
* from {@link #getAttributeRange(String)} or {@link #getThumbnailRange()}
* will throw {@link IllegalStateException}, since the offsets may have
* changed in the newly written file.
* </p>
*/
public void saveAttributes() throws IOException {
if (!mIsSupportedFile || mMimeType != IMAGE_TYPE_JPEG) {
throw new IOException("ExifInterface only supports saving attributes on JPEG formats.");
}
if (mIsInputStream || (mSeekableFileDescriptor == null && mFilename == null)) {
throw new IOException(
"ExifInterface does not support saving attributes for the current input.");
}
// Remember the fact that we've changed the file on disk from what was
// originally parsed, meaning we can't answer range questions
mModified = true;
// Keep the thumbnail in memory
mThumbnailBytes = getThumbnail();
FileInputStream in = null;
FileOutputStream out = null;
File tempFile = null;
try {
// Move the original file to temporary file.
if (mFilename != null) {
tempFile = new File(mFilename + ".tmp");
File originalFile = new File(mFilename);
if (!originalFile.renameTo(tempFile)) {
throw new IOException("Could'nt rename to " + tempFile.getAbsolutePath());
}
} else if (mSeekableFileDescriptor != null) {
tempFile = File.createTempFile("temp", "jpg");
Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET);
in = new FileInputStream(mSeekableFileDescriptor);
out = new FileOutputStream(tempFile);
Streams.copy(in, out);
}
} catch (ErrnoException e) {
throw e.rethrowAsIOException();
} finally {
IoUtils.closeQuietly(in);
IoUtils.closeQuietly(out);
}
in = null;
out = null;
try {
// Save the new file.
in = new FileInputStream(tempFile);
if (mFilename != null) {
out = new FileOutputStream(mFilename);
} else if (mSeekableFileDescriptor != null) {
Os.lseek(mSeekableFileDescriptor, 0, OsConstants.SEEK_SET);
out = new FileOutputStream(mSeekableFileDescriptor);
}
saveJpegAttributes(in, out);
} catch (ErrnoException e) {
throw e.rethrowAsIOException();
} finally {
IoUtils.closeQuietly(in);
IoUtils.closeQuietly(out);
tempFile.delete();
}
// Discard the thumbnail in memory
mThumbnailBytes = null;
}
/**
* Returns true if the image file has a thumbnail.
*/
public boolean hasThumbnail() {
return mHasThumbnail;
}
/**
* Returns true if the image file has the given attribute defined.
*
* @param tag the name of the tag.
*/
public boolean hasAttribute(@NonNull String tag) {
return (getExifAttribute(tag) != null);
}
/**
* Returns the JPEG compressed thumbnail inside the image file, or {@code null} if there is no
* JPEG compressed thumbnail.
* The returned data can be decoded using
* {@link android.graphics.BitmapFactory#decodeByteArray(byte[],int,int)}
*/
public byte[] getThumbnail() {
if (mThumbnailCompression == DATA_JPEG || mThumbnailCompression == DATA_JPEG_COMPRESSED) {
return getThumbnailBytes();
}
return null;
}
/**
* Returns the thumbnail bytes inside the image file, regardless of the compression type of the
* thumbnail image.
*/
public byte[] getThumbnailBytes() {
if (!mHasThumbnail) {
return null;
}
if (mThumbnailBytes != null) {
return mThumbnailBytes;
}
// Read the thumbnail.
InputStream in = null;
try {
if (mAssetInputStream != null) {
in = mAssetInputStream;
if (in.markSupported()) {
in.reset();
} else {
Log.d(TAG, "Cannot read thumbnail from inputstream without mark/reset support");
return null;
}
} else if (mFilename != null) {
in = new FileInputStream(mFilename);
} else if (mSeekableFileDescriptor != null) {
FileDescriptor fileDescriptor = Os.dup(mSeekableFileDescriptor);
Os.lseek(fileDescriptor, 0, OsConstants.SEEK_SET);
in = new FileInputStream(fileDescriptor);
}
if (in == null) {
// Should not be reached this.
throw new FileNotFoundException();
}
if (in.skip(mThumbnailOffset) != mThumbnailOffset) {
throw new IOException("Corrupted image");
}
byte[] buffer = new byte[mThumbnailLength];
if (in.read(buffer) != mThumbnailLength) {
throw new IOException("Corrupted image");
}
mThumbnailBytes = buffer;
return buffer;
} catch (IOException | ErrnoException e) {
// Couldn't get a thumbnail image.
Log.d(TAG, "Encountered exception while getting thumbnail", e);
} finally {
IoUtils.closeQuietly(in);
}
return null;
}
/**
* Creates and returns a Bitmap object of the thumbnail image based on the byte array and the
* thumbnail compression value, or {@code null} if the compression type is unsupported.
*/
public Bitmap getThumbnailBitmap() {
if (!mHasThumbnail) {
return null;
} else if (mThumbnailBytes == null) {
mThumbnailBytes = getThumbnailBytes();
}
if (mThumbnailCompression == DATA_JPEG || mThumbnailCompression == DATA_JPEG_COMPRESSED) {
return BitmapFactory.decodeByteArray(mThumbnailBytes, 0, mThumbnailLength);
} else if (mThumbnailCompression == DATA_UNCOMPRESSED) {
int[] rgbValues = new int[mThumbnailBytes.length / 3];
byte alpha = (byte) 0xff000000;
for (int i = 0; i < rgbValues.length; i++) {
rgbValues[i] = alpha + (mThumbnailBytes[3 * i] << 16)
+ (mThumbnailBytes[3 * i + 1] << 8) + mThumbnailBytes[3 * i + 2];
}
ExifAttribute imageLengthAttribute =
(ExifAttribute) mAttributes[IFD_TYPE_THUMBNAIL].get(TAG_IMAGE_LENGTH);
ExifAttribute imageWidthAttribute =
(ExifAttribute) mAttributes[IFD_TYPE_THUMBNAIL].get(TAG_IMAGE_WIDTH);
if (imageLengthAttribute != null && imageWidthAttribute != null) {
int imageLength = imageLengthAttribute.getIntValue(mExifByteOrder);
int imageWidth = imageWidthAttribute.getIntValue(mExifByteOrder);
return Bitmap.createBitmap(
rgbValues, imageWidth, imageLength, Bitmap.Config.ARGB_8888);
}
}
return null;
}
/**
* Returns true if thumbnail image is JPEG Compressed, or false if either thumbnail image does
* not exist or thumbnail image is uncompressed.
*/
public boolean isThumbnailCompressed() {
if (!mHasThumbnail) {
return false;
}
if (mThumbnailCompression == DATA_JPEG || mThumbnailCompression == DATA_JPEG_COMPRESSED) {
return true;
}
return false;
}
/**
* Returns the offset and length of thumbnail inside the image file, or
* {@code null} if there is no thumbnail.
*
* @return two-element array, the offset in the first value, and length in
* the second, or {@code null} if no thumbnail was found.
* @throws IllegalStateException if {@link #saveAttributes()} has been
* called since the underlying file was initially parsed, since
* that means offsets may have changed.
*/
public @Nullable long[] getThumbnailRange() {
if (mModified) {
throw new IllegalStateException(
"The underlying file has been modified since being parsed");
}
if (mHasThumbnail) {
return new long[] { mThumbnailOffset, mThumbnailLength };
} else {
return null;
}
}
/**
* Returns the offset and length of the requested tag inside the image file,
* or {@code null} if the tag is not contained.
*
* @return two-element array, the offset in the first value, and length in
* the second, or {@code null} if no tag was found.
* @throws IllegalStateException if {@link #saveAttributes()} has been
* called since the underlying file was initially parsed, since
* that means offsets may have changed.
*/
public @Nullable long[] getAttributeRange(@NonNull String tag) {
if (tag == null) {
throw new NullPointerException("tag shouldn't be null");
}
if (mModified) {
throw new IllegalStateException(
"The underlying file has been modified since being parsed");
}
final ExifAttribute attribute = getExifAttribute(tag);
if (attribute != null) {
return new long[] { attribute.bytesOffset, attribute.bytes.length };
} else {
return null;
}
}
/**
* Returns the raw bytes for the value of the requested tag inside the image
* file, or {@code null} if the tag is not contained.
*
* @return raw bytes for the value of the requested tag, or {@code null} if
* no tag was found.
*/
public @Nullable byte[] getAttributeBytes(@NonNull String tag) {
if (tag == null) {
throw new NullPointerException("tag shouldn't be null");
}
final ExifAttribute attribute = getExifAttribute(tag);
if (attribute != null) {
return attribute.bytes;
} else {
return null;
}
}
/**
* Stores the latitude and longitude value in a float array. The first element is
* the latitude, and the second element is the longitude. Returns false if the
* Exif tags are not available.
*/
public boolean getLatLong(float output[]) {
String latValue = getAttribute(TAG_GPS_LATITUDE);
String latRef = getAttribute(TAG_GPS_LATITUDE_REF);
String lngValue = getAttribute(TAG_GPS_LONGITUDE);
String lngRef = getAttribute(TAG_GPS_LONGITUDE_REF);
if (latValue != null && latRef != null && lngValue != null && lngRef != null) {
try {
output[0] = convertRationalLatLonToFloat(latValue, latRef);
output[1] = convertRationalLatLonToFloat(lngValue, lngRef);
return true;
} catch (IllegalArgumentException e) {
// if values are not parseable
}
}
return false;
}
/**
* Return the altitude in meters. If the exif tag does not exist, return
* <var>defaultValue</var>.
*
* @param defaultValue the value to return if the tag is not available.
*/
public double getAltitude(double defaultValue) {
double altitude = getAttributeDouble(TAG_GPS_ALTITUDE, -1);
int ref = getAttributeInt(TAG_GPS_ALTITUDE_REF, -1);
if (altitude >= 0 && ref >= 0) {
return (altitude * ((ref == 1) ? -1 : 1));
} else {
return defaultValue;
}
}
/**
* Returns parsed {@code DateTime} value, or -1 if unavailable or invalid.
*
* @hide
*/
@UnsupportedAppUsage
public @CurrentTimeMillisLong long getDateTime() {
return parseDateTime(getAttribute(TAG_DATETIME),
getAttribute(TAG_SUBSEC_TIME),
getAttribute(TAG_OFFSET_TIME));
}
/**
* Returns parsed {@code DateTimeDigitized} value, or -1 if unavailable or
* invalid.
*
* @hide
*/
public @CurrentTimeMillisLong long getDateTimeDigitized() {
return parseDateTime(getAttribute(TAG_DATETIME_DIGITIZED),
getAttribute(TAG_SUBSEC_TIME_DIGITIZED),
getAttribute(TAG_OFFSET_TIME_DIGITIZED));
}
/**
* Returns parsed {@code DateTimeOriginal} value, or -1 if unavailable or
* invalid.
*
* @hide
*/
@UnsupportedAppUsage
public @CurrentTimeMillisLong long getDateTimeOriginal() {
return parseDateTime(getAttribute(TAG_DATETIME_ORIGINAL),
getAttribute(TAG_SUBSEC_TIME_ORIGINAL),
getAttribute(TAG_OFFSET_TIME_ORIGINAL));
}
private static @CurrentTimeMillisLong long parseDateTime(@Nullable String dateTimeString,
@Nullable String subSecs, @Nullable String offsetString) {
if (dateTimeString == null
|| !sNonZeroTimePattern.matcher(dateTimeString).matches()) return -1;
ParsePosition pos = new ParsePosition(0);
try {
// The exif field is in local time. Parsing it as if it is UTC will yield time
// since 1/1/1970 local time
Date datetime = sFormatter.parse(dateTimeString, pos);
if (offsetString != null) {
dateTimeString = dateTimeString + " " + offsetString;
ParsePosition position = new ParsePosition(0);
datetime = sFormatterTz.parse(dateTimeString, position);
}
if (datetime == null) return -1;
long msecs = datetime.getTime();
if (subSecs != null) {
try {
long sub = Long.parseLong(subSecs);
while (sub > 1000) {
sub /= 10;
}
msecs += sub;
} catch (NumberFormatException e) {
// Ignored
}
}
return msecs;
} catch (IllegalArgumentException e) {
return -1;
}
}
/**
* Returns number of milliseconds since Jan. 1, 1970, midnight UTC.
* Returns -1 if the date time information if not available.
* @hide
*/
@UnsupportedAppUsage
public long getGpsDateTime() {
String date = getAttribute(TAG_GPS_DATESTAMP);
String time = getAttribute(TAG_GPS_TIMESTAMP);
if (date == null || time == null
|| (!sNonZeroTimePattern.matcher(date).matches()
&& !sNonZeroTimePattern.matcher(time).matches())) {
return -1;
}
String dateTimeString = date + ' ' + time;
ParsePosition pos = new ParsePosition(0);
try {
Date datetime = sFormatter.parse(dateTimeString, pos);
if (datetime == null) return -1;
return datetime.getTime();
} catch (IllegalArgumentException e) {
return -1;
}
}
/** {@hide} */
@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
public static float convertRationalLatLonToFloat(String rationalString, String ref) {
try {
String [] parts = rationalString.split(",");
String [] pair;
pair = parts[0].split("/");
double degrees = Double.parseDouble(pair[0].trim())
/ Double.parseDouble(pair[1].trim());
pair = parts[1].split("/");
double minutes = Double.parseDouble(pair[0].trim())
/ Double.parseDouble(pair[1].trim());
pair = parts[2].split("/");
double seconds = Double.parseDouble(pair[0].trim())
/ Double.parseDouble(pair[1].trim());
double result = degrees + (minutes / 60.0) + (seconds / 3600.0);
if ((ref.equals("S") || ref.equals("W"))) {
return (float) -result;
}
return (float) result;
} catch (NumberFormatException | ArrayIndexOutOfBoundsException e) {
// Not valid
throw new IllegalArgumentException();
}
}
private void initForFilename(String filename) throws IOException {
FileInputStream in = null;
mAssetInputStream = null;
mFilename = filename;
mIsInputStream = false;
try {
in = new FileInputStream(filename);
if (isSeekableFD(in.getFD())) {
mSeekableFileDescriptor = in.getFD();
} else {
mSeekableFileDescriptor = null;
}
loadAttributes(in);
} finally {
IoUtils.closeQuietly(in);
}
}
// Checks the type of image file
private int getMimeType(BufferedInputStream in) throws IOException {
in.mark(SIGNATURE_CHECK_SIZE);
byte[] signatureCheckBytes = new byte[SIGNATURE_CHECK_SIZE];
in.read(signatureCheckBytes);
in.reset();
if (isJpegFormat(signatureCheckBytes)) {
return IMAGE_TYPE_JPEG;
} else if (isRafFormat(signatureCheckBytes)) {
return IMAGE_TYPE_RAF;
} else if (isHeifFormat(signatureCheckBytes)) {
return IMAGE_TYPE_HEIF;
} else if (isOrfFormat(signatureCheckBytes)) {
return IMAGE_TYPE_ORF;
} else if (isRw2Format(signatureCheckBytes)) {
return IMAGE_TYPE_RW2;
}
// Certain file formats (PEF) are identified in readImageFileDirectory()
return IMAGE_TYPE_UNKNOWN;
}
/**
* This method looks at the first 3 bytes to determine if this file is a JPEG file.
* See http://www.media.mit.edu/pia/Research/deepview/exif.html, "JPEG format and Marker"
*/
private static boolean isJpegFormat(byte[] signatureCheckBytes) throws IOException {
for (int i = 0; i < JPEG_SIGNATURE.length; i++) {
if (signatureCheckBytes[i] != JPEG_SIGNATURE[i]) {
return false;
}
}
return true;
}
/**
* This method looks at the first 15 bytes to determine if this file is a RAF file.
* There is no official specification for RAF files from Fuji, but there is an online archive of
* image file specifications:
* http://fileformats.archiveteam.org/wiki/Fujifilm_RAF
*/
private boolean isRafFormat(byte[] signatureCheckBytes) throws IOException {
byte[] rafSignatureBytes = RAF_SIGNATURE.getBytes();
for (int i = 0; i < rafSignatureBytes.length; i++) {
if (signatureCheckBytes[i] != rafSignatureBytes[i]) {
return false;
}
}
return true;
}
private boolean isHeifFormat(byte[] signatureCheckBytes) throws IOException {
ByteOrderedDataInputStream signatureInputStream = null;
try {
signatureInputStream = new ByteOrderedDataInputStream(signatureCheckBytes);
signatureInputStream.setByteOrder(ByteOrder.BIG_ENDIAN);
long chunkSize = signatureInputStream.readInt();
byte[] chunkType = new byte[4];
signatureInputStream.read(chunkType);
if (!Arrays.equals(chunkType, HEIF_TYPE_FTYP)) {
return false;
}
long chunkDataOffset = 8;
if (chunkSize == 1) {
// This indicates that the next 8 bytes represent the chunk size,
// and chunk data comes after that.
chunkSize = signatureInputStream.readLong();
if (chunkSize < 16) {
// The smallest valid chunk is 16 bytes long in this case.
return false;
}
chunkDataOffset += 8;
}
// only sniff up to signatureCheckBytes.length
if (chunkSize > signatureCheckBytes.length) {
chunkSize = signatureCheckBytes.length;
}
long chunkDataSize = chunkSize - chunkDataOffset;
// It should at least have major brand (4-byte) and minor version (4-byte).
// The rest of the chunk (if any) is a list of (4-byte) compatible brands.
if (chunkDataSize < 8) {
return false;
}
byte[] brand = new byte[4];
boolean isMif1 = false;
boolean isHeic = false;
for (long i = 0; i < chunkDataSize / 4; ++i) {
if (signatureInputStream.read(brand) != brand.length) {
return false;
}
if (i == 1) {
// Skip this index, it refers to the minorVersion, not a brand.
continue;
}
if (Arrays.equals(brand, HEIF_BRAND_MIF1)) {
isMif1 = true;
} else if (Arrays.equals(brand, HEIF_BRAND_HEIC)) {
isHeic = true;
}
if (isMif1 && isHeic) {
return true;
}
}
} catch (Exception e) {
if (DEBUG) {
Log.d(TAG, "Exception parsing HEIF file type box.", e);
}
} finally {
if (signatureInputStream != null) {
signatureInputStream.close();
signatureInputStream = null;
}
}
return false;
}
/**
* ORF has a similar structure to TIFF but it contains a different signature at the TIFF Header.
* This method looks at the 2 bytes following the Byte Order bytes to determine if this file is
* an ORF file.
* There is no official specification for ORF files from Olympus, but there is an online archive
* of image file specifications:
* http://fileformats.archiveteam.org/wiki/Olympus_ORF
*/
private boolean isOrfFormat(byte[] signatureCheckBytes) throws IOException {
ByteOrderedDataInputStream signatureInputStream =
new ByteOrderedDataInputStream(signatureCheckBytes);
// Read byte order
mExifByteOrder = readByteOrder(signatureInputStream);
// Set byte order
signatureInputStream.setByteOrder(mExifByteOrder);
short orfSignature = signatureInputStream.readShort();
if (orfSignature == ORF_SIGNATURE_1 || orfSignature == ORF_SIGNATURE_2) {
return true;
}
return false;
}
/**
* RW2 is TIFF-based, but stores 0x55 signature byte instead of 0x42 at the header
* See http://lclevy.free.fr/raw/
*/
private boolean isRw2Format(byte[] signatureCheckBytes) throws IOException {
ByteOrderedDataInputStream signatureInputStream =
new ByteOrderedDataInputStream(signatureCheckBytes);
// Read byte order
mExifByteOrder = readByteOrder(signatureInputStream);
// Set byte order
signatureInputStream.setByteOrder(mExifByteOrder);
short signatureByte = signatureInputStream.readShort();
if (signatureByte == RW2_SIGNATURE) {
return true;
}
return false;
}
/**
* Loads EXIF attributes from a JPEG input stream.
*
* @param in The input stream that starts with the JPEG data.
* @param jpegOffset The offset value in input stream for JPEG data.
* @param imageType The image type from which to retrieve metadata. Use IFD_TYPE_PRIMARY for
* primary image, IFD_TYPE_PREVIEW for preview image, and
* IFD_TYPE_THUMBNAIL for thumbnail image.
* @throws IOException If the data contains invalid JPEG markers, offsets, or length values.
*/
private void getJpegAttributes(ByteOrderedDataInputStream in, int jpegOffset, int imageType)
throws IOException {
// See JPEG File Interchange Format Specification, "JFIF Specification"
if (DEBUG) {
Log.d(TAG, "getJpegAttributes starting with: " + in);
}
// JPEG uses Big Endian by default. See https://people.cs.umass.edu/~verts/cs32/endian.html
in.setByteOrder(ByteOrder.BIG_ENDIAN);
// Skip to JPEG data
in.seek(jpegOffset);
int bytesRead = jpegOffset;
byte marker;
if ((marker = in.readByte()) != MARKER) {
throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff));
}
++bytesRead;
if (in.readByte() != MARKER_SOI) {
throw new IOException("Invalid marker: " + Integer.toHexString(marker & 0xff));
}
++bytesRead;
while (true) {
marker = in.readByte();
if (marker != MARKER) {
throw new IOException("Invalid marker:" + Integer.toHexString(marker & 0xff));
}
++bytesRead;
marker = in.readByte();
if (DEBUG) {
Log.d(TAG, "Found JPEG segment indicator: " + Integer.toHexString(marker & 0xff));
}
++bytesRead;
// EOI indicates the end of an image and in case of SOS, JPEG image stream starts and
// the image data will terminate right after.
if (marker == MARKER_EOI || marker == MARKER_SOS) {
break;
}
int length = in.readUnsignedShort() - 2;
bytesRead += 2;
if (DEBUG) {
Log.d(TAG, "JPEG segment: " + Integer.toHexString(marker & 0xff) + " (length: "
+ (length + 2) + ")");
}
if (length < 0) {
throw new IOException("Invalid length");
}
switch (marker) {
case MARKER_APP1: {
final int start = bytesRead;
final byte[] bytes = new byte[length];
in.readFully(bytes);
bytesRead += length;
length = 0;
if (ArrayUtils.startsWith(bytes, IDENTIFIER_EXIF_APP1)) {
final long offset = start + IDENTIFIER_EXIF_APP1.length;
final byte[] value = Arrays.copyOfRange(bytes,
IDENTIFIER_EXIF_APP1.length, bytes.length);
readExifSegment(value, imageType);
// Save offset values for createJpegThumbnailBitmap() function
mExifOffset = (int) offset;
} else if (ArrayUtils.startsWith(bytes, IDENTIFIER_XMP_APP1)) {
// See XMP Specification Part 3: Storage in Files, 1.1.3 JPEG, Table 6
final long offset = start + IDENTIFIER_XMP_APP1.length;
final byte[] value = Arrays.copyOfRange(bytes,
IDENTIFIER_XMP_APP1.length, bytes.length);
if (getAttribute(TAG_XMP) == null) {
mAttributes[IFD_TYPE_PRIMARY].put(TAG_XMP, new ExifAttribute(
IFD_FORMAT_BYTE, value.length, offset, value));
}
}
break;
}
case MARKER_COM: {
byte[] bytes = new byte[length];
if (in.read(bytes) != length) {
throw new IOException("Invalid exif");
}
length = 0;
if (getAttribute(TAG_USER_COMMENT) == null) {
mAttributes[IFD_TYPE_EXIF].put(TAG_USER_COMMENT, ExifAttribute.createString(
new String(bytes, ASCII)));
}
break;
}
case MARKER_SOF0:
case MARKER_SOF1:
case MARKER_SOF2:
case MARKER_SOF3:
case MARKER_SOF5:
case MARKER_SOF6:
case MARKER_SOF7:
case MARKER_SOF9:
case MARKER_SOF10:
case MARKER_SOF11:
case MARKER_SOF13:
case MARKER_SOF14:
case MARKER_SOF15: {
if (in.skipBytes(1) != 1) {
throw new IOException("Invalid SOFx");
}
mAttributes[imageType].put(TAG_IMAGE_LENGTH, ExifAttribute.createULong(
in.readUnsignedShort(), mExifByteOrder));
mAttributes[imageType].put(TAG_IMAGE_WIDTH, ExifAttribute.createULong(
in.readUnsignedShort(), mExifByteOrder));
length -= 5;
break;
}
default: {
break;
}
}
if (length < 0) {
throw new IOException("Invalid length");
}
if (in.skipBytes(length) != length) {
throw new IOException("Invalid JPEG segment");
}
bytesRead += length;
}
// Restore original byte order
in.setByteOrder(mExifByteOrder);
}
private void getRawAttributes(ByteOrderedDataInputStream in) throws IOException {
// Parse TIFF Headers. See JEITA CP-3451C Section 4.5.2. Table 1.
parseTiffHeaders(in, in.available());
// Read TIFF image file directories. See JEITA CP-3451C Section 4.5.2. Figure 6.
readImageFileDirectory(in, IFD_TYPE_PRIMARY);
// Update ImageLength/Width tags for all image data.
updateImageSizeValues(in, IFD_TYPE_PRIMARY);
updateImageSizeValues(in, IFD_TYPE_PREVIEW);
updateImageSizeValues(in, IFD_TYPE_THUMBNAIL);
// Check if each image data is in valid position.
validateImages(in);
if (mMimeType == IMAGE_TYPE_PEF) {
// PEF files contain a MakerNote data, which contains the data for ColorSpace tag.
// See http://lclevy.free.fr/raw/ and piex.cc PefGetPreviewData()
ExifAttribute makerNoteAttribute =
(ExifAttribute) mAttributes[IFD_TYPE_EXIF].get(TAG_MAKER_NOTE);
if (makerNoteAttribute != null) {
// Create an ordered DataInputStream for MakerNote
ByteOrderedDataInputStream makerNoteDataInputStream =
new ByteOrderedDataInputStream(makerNoteAttribute.bytes);
makerNoteDataInputStream.setByteOrder(mExifByteOrder);
// Seek to MakerNote data
makerNoteDataInputStream.seek(PEF_MAKER_NOTE_SKIP_SIZE);
// Read IFD data from MakerNote
readImageFileDirectory(makerNoteDataInputStream, IFD_TYPE_PEF);
// Update ColorSpace tag
ExifAttribute colorSpaceAttribute =
(ExifAttribute) mAttributes[IFD_TYPE_PEF].get(TAG_COLOR_SPACE);
if (colorSpaceAttribute != null) {
mAttributes[IFD_TYPE_EXIF].put(TAG_COLOR_SPACE, colorSpaceAttribute);
}
}
}
}
/**
* RAF files contains a JPEG and a CFA data.
* The JPEG contains two images, a preview and a thumbnail, while the CFA contains a RAW image.
* This method looks at the first 160 bytes of a RAF file to retrieve the offset and length
* values for the JPEG and CFA data.
* Using that data, it parses the JPEG data to retrieve the preview and thumbnail image data,
* then parses the CFA metadata to retrieve the primary image length/width values.
* For data format details, see http://fileformats.archiveteam.org/wiki/Fujifilm_RAF
*/
private void getRafAttributes(ByteOrderedDataInputStream in) throws IOException {
// Retrieve offset & length values
in.skipBytes(RAF_OFFSET_TO_JPEG_IMAGE_OFFSET);
byte[] jpegOffsetBytes = new byte[4];
byte[] cfaHeaderOffsetBytes = new byte[4];
in.read(jpegOffsetBytes);
// Skip JPEG length value since it is not needed
in.skipBytes(RAF_JPEG_LENGTH_VALUE_SIZE);
in.read(cfaHeaderOffsetBytes);
int rafJpegOffset = ByteBuffer.wrap(jpegOffsetBytes).getInt();
int rafCfaHeaderOffset = ByteBuffer.wrap(cfaHeaderOffsetBytes).getInt();
// Retrieve JPEG image metadata
getJpegAttributes(in, rafJpegOffset, IFD_TYPE_PREVIEW);
// Skip to CFA header offset.
in.seek(rafCfaHeaderOffset);
// Retrieve primary image length/width values, if TAG_RAF_IMAGE_SIZE exists
in.setByteOrder(ByteOrder.BIG_ENDIAN);
int numberOfDirectoryEntry = in.readInt();
if (DEBUG) {
Log.d(TAG, "numberOfDirectoryEntry: " + numberOfDirectoryEntry);
}
// CFA stores some metadata about the RAW image. Since CFA uses proprietary tags, can only
// find and retrieve image size information tags, while skipping others.
// See piex.cc RafGetDimension()
for (int i = 0; i < numberOfDirectoryEntry; ++i) {
int tagNumber = in.readUnsignedShort();
int numberOfBytes = in.readUnsignedShort();
if (tagNumber == TAG_RAF_IMAGE_SIZE.number) {
int imageLength = in.readShort();
int imageWidth = in.readShort();
ExifAttribute imageLengthAttribute =
ExifAttribute.createUShort(imageLength, mExifByteOrder);
ExifAttribute imageWidthAttribute =
ExifAttribute.createUShort(imageWidth, mExifByteOrder);
mAttributes[IFD_TYPE_PRIMARY].put(TAG_IMAGE_LENGTH, imageLengthAttribute);
mAttributes[IFD_TYPE_PRIMARY].put(TAG_IMAGE_WIDTH, imageWidthAttribute);
if (DEBUG) {
Log.d(TAG, "Updated to length: " + imageLength + ", width: " + imageWidth);
}
return;
}
in.skipBytes(numberOfBytes);
}
}
private void getHeifAttributes(ByteOrderedDataInputStream in) throws IOException {
MediaMetadataRetriever retriever = new MediaMetadataRetriever();
try {
retriever.setDataSource(new MediaDataSource() {
long mPosition;
@Override
public void close() throws IOException {}
@Override
public int readAt(long position, byte[] buffer, int offset, int size)
throws IOException {
if (size == 0) {
return 0;
}
if (position < 0) {
return -1;
}
try {
if (mPosition != position) {
// We don't allow seek to positions after the available bytes,
// the input stream won't be able to seek back then.
// However, if we hit an exception before (mPosition set to -1),
// let it try the seek in hope it might recover.
if (mPosition >= 0 && position >= mPosition + in.available()) {
return -1;
}
in.seek(position);
mPosition = position;
}
// If the read will cause us to go over the available bytes,
// reduce the size so that we stay in the available range.
// Otherwise the input stream may not be able to seek back.
if (size > in.available()) {
size = in.available();
}
int bytesRead = in.read(buffer, offset, size);
if (bytesRead >= 0) {
mPosition += bytesRead;
return bytesRead;
}
} catch (IOException e) {}
mPosition = -1; // need to seek on next read
return -1;
}
@Override
public long getSize() throws IOException {
return -1;
}
});
String exifOffsetStr = retriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_EXIF_OFFSET);
String exifLengthStr = retriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_EXIF_LENGTH);
String hasImage = retriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_HAS_IMAGE);
String hasVideo = retriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_HAS_VIDEO);
String width = null;
String height = null;
String rotation = null;
final String METADATA_VALUE_YES = "yes";
// If the file has both image and video, prefer image info over video info.
// App querying ExifInterface is most likely using the bitmap path which
// picks the image first.
if (METADATA_VALUE_YES.equals(hasImage)) {
width = retriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_IMAGE_WIDTH);
height = retriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_IMAGE_HEIGHT);
rotation = retriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_IMAGE_ROTATION);
} else if (METADATA_VALUE_YES.equals(hasVideo)) {
width = retriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_VIDEO_WIDTH);
height = retriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_VIDEO_HEIGHT);
rotation = retriever.extractMetadata(
MediaMetadataRetriever.METADATA_KEY_VIDEO_ROTATION);
}
if (width != null) {
mAttributes[IFD_TYPE_PRIMARY].put(TAG_IMAGE_WIDTH,
ExifAttribute.createUShort(Integer.parseInt(width), mExifByteOrder));
}
if (height != null) {
mAttributes[IFD_TYPE_PRIMARY].put(TAG_IMAGE_LENGTH,
ExifAttribute.createUShort(Integer.parseInt(height), mExifByteOrder));
}
if (rotation != null) {
int orientation = ExifInterface.ORIENTATION_NORMAL;
// all rotation angles in CW
switch (Integer.parseInt(rotation)) {
case 90:
orientation = ExifInterface.ORIENTATION_ROTATE_90;
break;
case 180:
orientation = ExifInterface.ORIENTATION_ROTATE_180;
break;
case 270:
orientation = ExifInterface.ORIENTATION_ROTATE_270;
break;
}
mAttributes[IFD_TYPE_PRIMARY].put(TAG_ORIENTATION,
ExifAttribute.createUShort(orientation, mExifByteOrder));
}
if (exifOffsetStr != null && exifLengthStr != null) {
int offset = Integer.parseInt(exifOffsetStr);
int length = Integer.parseInt(exifLengthStr);
if (length <= 6) {
throw new IOException("Invalid exif length");
}
in.seek(offset);
byte[] identifier = new byte[6];
if (in.read(identifier) != 6) {
throw new IOException("Can't read identifier");
}
offset += 6;
length -= 6;
if (!Arrays.equals(identifier, IDENTIFIER_EXIF_APP1)) {
throw new IOException("Invalid identifier");
}
byte[] bytes = new byte[length];
if (in.read(bytes) != length) {
throw new IOException("Can't read exif");
}
readExifSegment(bytes, IFD_TYPE_PRIMARY);
}
if (DEBUG) {
Log.d(TAG, "Heif meta: " + width + "x" + height + ", rotation " + rotation);
}
} finally {
retriever.release();
}
}
/**
* ORF files contains a primary image data and a MakerNote data that contains preview/thumbnail
* images. Both data takes the form of IFDs and can therefore be read with the
* readImageFileDirectory() method.
* This method reads all the necessary data and updates the primary/preview/thumbnail image
* information according to the GetOlympusPreviewImage() method in piex.cc.
* For data format details, see the following:
* http://fileformats.archiveteam.org/wiki/Olympus_ORF
* https://libopenraw.freedesktop.org/wiki/Olympus_ORF
*/
private void getOrfAttributes(ByteOrderedDataInputStream in) throws IOException {
// Retrieve primary image data
// Other Exif data will be located in the Makernote.
getRawAttributes(in);
// Additionally retrieve preview/thumbnail information from MakerNote tag, which contains
// proprietary tags and therefore does not have offical documentation
// See GetOlympusPreviewImage() in piex.cc & http://www.exiv2.org/tags-olympus.html
ExifAttribute makerNoteAttribute =
(ExifAttribute) mAttributes[IFD_TYPE_EXIF].get(TAG_MAKER_NOTE);
if (makerNoteAttribute != null) {
// Create an ordered DataInputStream for MakerNote
ByteOrderedDataInputStream makerNoteDataInputStream =
new ByteOrderedDataInputStream(makerNoteAttribute.bytes);
makerNoteDataInputStream.setByteOrder(mExifByteOrder);
// There are two types of headers for Olympus MakerNotes
// See http://www.exiv2.org/makernote.html#R1
byte[] makerNoteHeader1Bytes = new byte[ORF_MAKER_NOTE_HEADER_1.length];
makerNoteDataInputStream.readFully(makerNoteHeader1Bytes);
makerNoteDataInputStream.seek(0);
byte[] makerNoteHeader2Bytes = new byte[ORF_MAKER_NOTE_HEADER_2.length];
makerNoteDataInputStream.readFully(makerNoteHeader2Bytes);
// Skip the corresponding amount of bytes for each header type
if (Arrays.equals(makerNoteHeader1Bytes, ORF_MAKER_NOTE_HEADER_1)) {
makerNoteDataInputStream.seek(ORF_MAKER_NOTE_HEADER_1_SIZE);
} else if (Arrays.equals(makerNoteHeader2Bytes, ORF_MAKER_NOTE_HEADER_2)) {
makerNoteDataInputStream.seek(ORF_MAKER_NOTE_HEADER_2_SIZE);
}
// Read IFD data from MakerNote
readImageFileDirectory(makerNoteDataInputStream, IFD_TYPE_ORF_MAKER_NOTE);
// Retrieve & update preview image offset & length values
ExifAttribute imageLengthAttribute = (ExifAttribute)
mAttributes[IFD_TYPE_ORF_CAMERA_SETTINGS].get(TAG_ORF_PREVIEW_IMAGE_START);
ExifAttribute bitsPerSampleAttribute = (ExifAttribute)
mAttributes[IFD_TYPE_ORF_CAMERA_SETTINGS].get(TAG_ORF_PREVIEW_IMAGE_LENGTH);
if (imageLengthAttribute != null && bitsPerSampleAttribute != null) {
mAttributes[IFD_TYPE_PREVIEW].put(TAG_JPEG_INTERCHANGE_FORMAT,
imageLengthAttribute);
mAttributes[IFD_TYPE_PREVIEW].put(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH,
bitsPerSampleAttribute);
}
// TODO: Check this behavior in other ORF files
// Retrieve primary image length & width values
// See piex.cc GetOlympusPreviewImage()
ExifAttribute aspectFrameAttribute = (ExifAttribute)
mAttributes[IFD_TYPE_ORF_IMAGE_PROCESSING].get(TAG_ORF_ASPECT_FRAME);
if (aspectFrameAttribute != null) {
int[] aspectFrameValues = new int[4];
aspectFrameValues = (int[]) aspectFrameAttribute.getValue(mExifByteOrder);
if (aspectFrameValues[2] > aspectFrameValues[0] &&
aspectFrameValues[3] > aspectFrameValues[1]) {
int primaryImageWidth = aspectFrameValues[2] - aspectFrameValues[0] + 1;
int primaryImageLength = aspectFrameValues[3] - aspectFrameValues[1] + 1;
// Swap width & length values
if (primaryImageWidth < primaryImageLength) {
primaryImageWidth += primaryImageLength;
primaryImageLength = primaryImageWidth - primaryImageLength;
primaryImageWidth -= primaryImageLength;
}
ExifAttribute primaryImageWidthAttribute =
ExifAttribute.createUShort(primaryImageWidth, mExifByteOrder);
ExifAttribute primaryImageLengthAttribute =
ExifAttribute.createUShort(primaryImageLength, mExifByteOrder);
mAttributes[IFD_TYPE_PRIMARY].put(TAG_IMAGE_WIDTH, primaryImageWidthAttribute);
mAttributes[IFD_TYPE_PRIMARY].put(TAG_IMAGE_LENGTH, primaryImageLengthAttribute);
}
}
}
}
// RW2 contains the primary image data in IFD0 and the preview and/or thumbnail image data in
// the JpgFromRaw tag
// See https://libopenraw.freedesktop.org/wiki/Panasonic_RAW/ and piex.cc Rw2GetPreviewData()
private void getRw2Attributes(ByteOrderedDataInputStream in) throws IOException {
// Retrieve primary image data
getRawAttributes(in);
// Retrieve preview and/or thumbnail image data
ExifAttribute jpgFromRawAttribute =
(ExifAttribute) mAttributes[IFD_TYPE_PRIMARY].get(TAG_RW2_JPG_FROM_RAW);
if (jpgFromRawAttribute != null) {
getJpegAttributes(in, mRw2JpgFromRawOffset, IFD_TYPE_PREVIEW);
}
// Set ISO tag value if necessary
ExifAttribute rw2IsoAttribute =
(ExifAttribute) mAttributes[IFD_TYPE_PRIMARY].get(TAG_RW2_ISO);
ExifAttribute exifIsoAttribute =
(ExifAttribute) mAttributes[IFD_TYPE_EXIF].get(TAG_ISO_SPEED_RATINGS);
if (rw2IsoAttribute != null && exifIsoAttribute == null) {
// Place this attribute only if it doesn't exist
mAttributes[IFD_TYPE_EXIF].put(TAG_ISO_SPEED_RATINGS, rw2IsoAttribute);
}
}
// Stores a new JPEG image with EXIF attributes into a given output stream.
private void saveJpegAttributes(InputStream inputStream, OutputStream outputStream)
throws IOException {
// See JPEG File Interchange Format Specification, "JFIF Specification"
if (DEBUG) {
Log.d(TAG, "saveJpegAttributes starting with (inputStream: " + inputStream
+ ", outputStream: " + outputStream + ")");
}
DataInputStream dataInputStream = new DataInputStream(inputStream);
ByteOrderedDataOutputStream dataOutputStream =
new ByteOrderedDataOutputStream(outputStream, ByteOrder.BIG_ENDIAN);
if (dataInputStream.readByte() != MARKER) {
throw new IOException("Invalid marker");
}
dataOutputStream.writeByte(MARKER);
if (dataInputStream.readByte() != MARKER_SOI) {
throw new IOException("Invalid marker");
}
dataOutputStream.writeByte(MARKER_SOI);
// Write EXIF APP1 segment
dataOutputStream.writeByte(MARKER);
dataOutputStream.writeByte(MARKER_APP1);
writeExifSegment(dataOutputStream, 6);
byte[] bytes = new byte[4096];
while (true) {
byte marker = dataInputStream.readByte();
if (marker != MARKER) {
throw new IOException("Invalid marker");
}
marker = dataInputStream.readByte();
switch (marker) {
case MARKER_APP1: {
int length = dataInputStream.readUnsignedShort() - 2;
if (length < 0) {
throw new IOException("Invalid length");
}
byte[] identifier = new byte[6];
if (length >= 6) {
if (dataInputStream.read(identifier) != 6) {
throw new IOException("Invalid exif");
}
if (Arrays.equals(identifier, IDENTIFIER_EXIF_APP1)) {
// Skip the original EXIF APP1 segment.
if (dataInputStream.skipBytes(length - 6) != length - 6) {
throw new IOException("Invalid length");
}
break;
}
}
// Copy non-EXIF APP1 segment.
dataOutputStream.writeByte(MARKER);
dataOutputStream.writeByte(marker);
dataOutputStream.writeUnsignedShort(length + 2);
if (length >= 6) {
length -= 6;
dataOutputStream.write(identifier);
}
int read;
while (length > 0 && (read = dataInputStream.read(
bytes, 0, Math.min(length, bytes.length))) >= 0) {
dataOutputStream.write(bytes, 0, read);
length -= read;
}
break;
}
case MARKER_EOI:
case MARKER_SOS: {
dataOutputStream.writeByte(MARKER);
dataOutputStream.writeByte(marker);
// Copy all the remaining data
Streams.copy(dataInputStream, dataOutputStream);
return;
}
default: {
// Copy JPEG segment
dataOutputStream.writeByte(MARKER);
dataOutputStream.writeByte(marker);
int length = dataInputStream.readUnsignedShort();
dataOutputStream.writeUnsignedShort(length);
length -= 2;
if (length < 0) {
throw new IOException("Invalid length");
}
int read;
while (length > 0 && (read = dataInputStream.read(
bytes, 0, Math.min(length, bytes.length))) >= 0) {
dataOutputStream.write(bytes, 0, read);
length -= read;
}
break;
}
}
}
}
// Reads the given EXIF byte area and save its tag data into attributes.
private void readExifSegment(byte[] exifBytes, int imageType) throws IOException {
ByteOrderedDataInputStream dataInputStream =
new ByteOrderedDataInputStream(exifBytes);
// Parse TIFF Headers. See JEITA CP-3451C Section 4.5.2. Table 1.
parseTiffHeaders(dataInputStream, exifBytes.length);
// Read TIFF image file directories. See JEITA CP-3451C Section 4.5.2. Figure 6.
readImageFileDirectory(dataInputStream, imageType);
}
private void addDefaultValuesForCompatibility() {
// If DATETIME tag has no value, then set the value to DATETIME_ORIGINAL tag's.
String valueOfDateTimeOriginal = getAttribute(TAG_DATETIME_ORIGINAL);
if (valueOfDateTimeOriginal != null && getAttribute(TAG_DATETIME) == null) {
mAttributes[IFD_TYPE_PRIMARY].put(TAG_DATETIME,
ExifAttribute.createString(valueOfDateTimeOriginal));
}
// Add the default value.
if (getAttribute(TAG_IMAGE_WIDTH) == null) {
mAttributes[IFD_TYPE_PRIMARY].put(TAG_IMAGE_WIDTH,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (getAttribute(TAG_IMAGE_LENGTH) == null) {
mAttributes[IFD_TYPE_PRIMARY].put(TAG_IMAGE_LENGTH,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (getAttribute(TAG_ORIENTATION) == null) {
mAttributes[IFD_TYPE_PRIMARY].put(TAG_ORIENTATION,
ExifAttribute.createUShort(0, mExifByteOrder));
}
if (getAttribute(TAG_LIGHT_SOURCE) == null) {
mAttributes[IFD_TYPE_EXIF].put(TAG_LIGHT_SOURCE,
ExifAttribute.createULong(0, mExifByteOrder));
}
}
private ByteOrder readByteOrder(ByteOrderedDataInputStream dataInputStream)
throws IOException {
// Read byte order.
short byteOrder = dataInputStream.readShort();
switch (byteOrder) {
case BYTE_ALIGN_II:
if (DEBUG) {
Log.d(TAG, "readExifSegment: Byte Align II");
}
return ByteOrder.LITTLE_ENDIAN;
case BYTE_ALIGN_MM:
if (DEBUG) {
Log.d(TAG, "readExifSegment: Byte Align MM");
}
return ByteOrder.BIG_ENDIAN;
default:
throw new IOException("Invalid byte order: " + Integer.toHexString(byteOrder));
}
}
private void parseTiffHeaders(ByteOrderedDataInputStream dataInputStream,
int exifBytesLength) throws IOException {
// Read byte order
mExifByteOrder = readByteOrder(dataInputStream);
// Set byte order
dataInputStream.setByteOrder(mExifByteOrder);
// Check start code
int startCode = dataInputStream.readUnsignedShort();
if (mMimeType != IMAGE_TYPE_ORF && mMimeType != IMAGE_TYPE_RW2 && startCode != START_CODE) {
throw new IOException("Invalid start code: " + Integer.toHexString(startCode));
}
// Read and skip to first ifd offset
int firstIfdOffset = dataInputStream.readInt();
if (firstIfdOffset < 8 || firstIfdOffset >= exifBytesLength) {
throw new IOException("Invalid first Ifd offset: " + firstIfdOffset);
}
firstIfdOffset -= 8;
if (firstIfdOffset > 0) {
if (dataInputStream.skipBytes(firstIfdOffset) != firstIfdOffset) {
throw new IOException("Couldn't jump to first Ifd: " + firstIfdOffset);
}
}
}
// Reads image file directory, which is a tag group in EXIF.
private void readImageFileDirectory(ByteOrderedDataInputStream dataInputStream,
@IfdType int ifdType) throws IOException {
// Save offset of current IFD to prevent reading an IFD that is already read.
mHandledIfdOffsets.add(dataInputStream.mPosition);
if (dataInputStream.mPosition + 2 > dataInputStream.mLength) {
// Return if there is no data from the offset.
return;
}
// See TIFF 6.0 Section 2: TIFF Structure, Figure 1.
short numberOfDirectoryEntry = dataInputStream.readShort();
if (dataInputStream.mPosition + 12 * numberOfDirectoryEntry > dataInputStream.mLength
|| numberOfDirectoryEntry <= 0) {
// Return if the size of entries is either too big or negative.
return;
}
if (DEBUG) {
Log.d(TAG, "numberOfDirectoryEntry: " + numberOfDirectoryEntry);
}
// See TIFF 6.0 Section 2: TIFF Structure, "Image File Directory".
for (short i = 0; i < numberOfDirectoryEntry; ++i) {
int tagNumber = dataInputStream.readUnsignedShort();
int dataFormat = dataInputStream.readUnsignedShort();
int numberOfComponents = dataInputStream.readInt();
// Next four bytes is for data offset or value.
long nextEntryOffset = dataInputStream.peek() + 4;
// Look up a corresponding tag from tag number
ExifTag tag = (ExifTag) sExifTagMapsForReading[ifdType].get(tagNumber);
if (DEBUG) {
Log.d(TAG, String.format("ifdType: %d, tagNumber: %d, tagName: %s, dataFormat: %d, "
+ "numberOfComponents: %d", ifdType, tagNumber,
tag != null ? tag.name : null, dataFormat, numberOfComponents));
}
long byteCount = 0;
boolean valid = false;
if (tag == null) {
if (DEBUG) {
Log.d(TAG, "Skip the tag entry since tag number is not defined: " + tagNumber);
}
} else if (dataFormat <= 0 || dataFormat >= IFD_FORMAT_BYTES_PER_FORMAT.length) {
if (DEBUG) {
Log.d(TAG, "Skip the tag entry since data format is invalid: " + dataFormat);
}
} else {
byteCount = (long) numberOfComponents * IFD_FORMAT_BYTES_PER_FORMAT[dataFormat];
if (byteCount < 0 || byteCount > Integer.MAX_VALUE) {
if (DEBUG) {
Log.d(TAG, "Skip the tag entry since the number of components is invalid: "
+ numberOfComponents);
}
} else {
valid = true;
}
}
if (!valid) {
dataInputStream.seek(nextEntryOffset);
continue;
}
// Read a value from data field or seek to the value offset which is stored in data
// field if the size of the entry value is bigger than 4.
if (byteCount > 4) {
int offset = dataInputStream.readInt();
if (DEBUG) {
Log.d(TAG, "seek to data offset: " + offset);
}
if (mMimeType == IMAGE_TYPE_ORF) {
if (tag.name == TAG_MAKER_NOTE) {
// Save offset value for reading thumbnail
mOrfMakerNoteOffset = offset;
} else if (ifdType == IFD_TYPE_ORF_MAKER_NOTE
&& tag.name == TAG_ORF_THUMBNAIL_IMAGE) {
// Retrieve & update values for thumbnail offset and length values for ORF
mOrfThumbnailOffset = offset;
mOrfThumbnailLength = numberOfComponents;
ExifAttribute compressionAttribute =
ExifAttribute.createUShort(DATA_JPEG, mExifByteOrder);
ExifAttribute jpegInterchangeFormatAttribute =
ExifAttribute.createULong(mOrfThumbnailOffset, mExifByteOrder);
ExifAttribute jpegInterchangeFormatLengthAttribute =
ExifAttribute.createULong(mOrfThumbnailLength, mExifByteOrder);
mAttributes[IFD_TYPE_THUMBNAIL].put(TAG_COMPRESSION, compressionAttribute);
mAttributes[IFD_TYPE_THUMBNAIL].put(TAG_JPEG_INTERCHANGE_FORMAT,
jpegInterchangeFormatAttribute);
mAttributes[IFD_TYPE_THUMBNAIL].put(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH,
jpegInterchangeFormatLengthAttribute);
}
} else if (mMimeType == IMAGE_TYPE_RW2) {
if (tag.name == TAG_RW2_JPG_FROM_RAW) {
mRw2JpgFromRawOffset = offset;
}
}
if (offset + byteCount <= dataInputStream.mLength) {
dataInputStream.seek(offset);
} else {
// Skip if invalid data offset.
if (DEBUG) {
Log.d(TAG, "Skip the tag entry since data offset is invalid: " + offset);
}
dataInputStream.seek(nextEntryOffset);
continue;
}
}
// Recursively parse IFD when a IFD pointer tag appears.
Integer nextIfdType = sExifPointerTagMap.get(tagNumber);
if (DEBUG) {
Log.d(TAG, "nextIfdType: " + nextIfdType + " byteCount: " + byteCount);
}
if (nextIfdType != null) {
long offset = -1L;
// Get offset from data field
switch (dataFormat) {
case IFD_FORMAT_USHORT: {
offset = dataInputStream.readUnsignedShort();
break;
}
case IFD_FORMAT_SSHORT: {
offset = dataInputStream.readShort();
break;
}
case IFD_FORMAT_ULONG: {
offset = dataInputStream.readUnsignedInt();
break;
}
case IFD_FORMAT_SLONG:
case IFD_FORMAT_IFD: {
offset = dataInputStream.readInt();
break;
}
default: {
// Nothing to do
break;
}
}
if (DEBUG) {
Log.d(TAG, String.format("Offset: %d, tagName: %s", offset, tag.name));
}
// Check if the next IFD offset
// 1. Exists within the boundaries of the input stream
// 2. Does not point to a previously read IFD.
if (offset > 0L && offset < dataInputStream.mLength) {
if (!mHandledIfdOffsets.contains((int) offset)) {
dataInputStream.seek(offset);
readImageFileDirectory(dataInputStream, nextIfdType);
} else {
if (DEBUG) {
Log.d(TAG, "Skip jump into the IFD since it has already been read: "
+ "IfdType " + nextIfdType + " (at " + offset + ")");
}
}
} else {
if (DEBUG) {
Log.d(TAG, "Skip jump into the IFD since its offset is invalid: " + offset);
}
}
dataInputStream.seek(nextEntryOffset);
continue;
}
final int bytesOffset = dataInputStream.peek();
final byte[] bytes = new byte[(int) byteCount];
dataInputStream.readFully(bytes);
ExifAttribute attribute = new ExifAttribute(dataFormat, numberOfComponents,
bytesOffset, bytes);
mAttributes[ifdType].put(tag.name, attribute);
// DNG files have a DNG Version tag specifying the version of specifications that the
// image file is following.
// See http://fileformats.archiveteam.org/wiki/DNG
if (tag.name == TAG_DNG_VERSION) {
mMimeType = IMAGE_TYPE_DNG;
}
// PEF files have a Make or Model tag that begins with "PENTAX" or a compression tag
// that is 65535.
// See http://fileformats.archiveteam.org/wiki/Pentax_PEF
if (((tag.name == TAG_MAKE || tag.name == TAG_MODEL)
&& attribute.getStringValue(mExifByteOrder).contains(PEF_SIGNATURE))
|| (tag.name == TAG_COMPRESSION
&& attribute.getIntValue(mExifByteOrder) == 65535)) {
mMimeType = IMAGE_TYPE_PEF;
}
// Seek to next tag offset
if (dataInputStream.peek() != nextEntryOffset) {
dataInputStream.seek(nextEntryOffset);
}
}
if (dataInputStream.peek() + 4 <= dataInputStream.mLength) {
int nextIfdOffset = dataInputStream.readInt();
if (DEBUG) {
Log.d(TAG, String.format("nextIfdOffset: %d", nextIfdOffset));
}
// Check if the next IFD offset
// 1. Exists within the boundaries of the input stream
// 2. Does not point to a previously read IFD.
if (nextIfdOffset > 0L && nextIfdOffset < dataInputStream.mLength) {
if (!mHandledIfdOffsets.contains(nextIfdOffset)) {
dataInputStream.seek(nextIfdOffset);
// Do not overwrite thumbnail IFD data if it alreay exists.
if (mAttributes[IFD_TYPE_THUMBNAIL].isEmpty()) {
readImageFileDirectory(dataInputStream, IFD_TYPE_THUMBNAIL);
} else if (mAttributes[IFD_TYPE_PREVIEW].isEmpty()) {
readImageFileDirectory(dataInputStream, IFD_TYPE_PREVIEW);
}
} else {
if (DEBUG) {
Log.d(TAG, "Stop reading file since re-reading an IFD may cause an "
+ "infinite loop: " + nextIfdOffset);
}
}
} else {
if (DEBUG) {
Log.d(TAG, "Stop reading file since a wrong offset may cause an infinite loop: "
+ nextIfdOffset);
}
}
}
}
/**
* JPEG compressed images do not contain IMAGE_LENGTH & IMAGE_WIDTH tags.
* This value uses JpegInterchangeFormat(JPEG data offset) value, and calls getJpegAttributes()
* to locate SOF(Start of Frame) marker and update the image length & width values.
* See JEITA CP-3451C Table 5 and Section 4.8.1. B.
*/
private void retrieveJpegImageSize(ByteOrderedDataInputStream in, int imageType)
throws IOException {
// Check if image already has IMAGE_LENGTH & IMAGE_WIDTH values
ExifAttribute imageLengthAttribute =
(ExifAttribute) mAttributes[imageType].get(TAG_IMAGE_LENGTH);
ExifAttribute imageWidthAttribute =
(ExifAttribute) mAttributes[imageType].get(TAG_IMAGE_WIDTH);
if (imageLengthAttribute == null || imageWidthAttribute == null) {
// Find if offset for JPEG data exists
ExifAttribute jpegInterchangeFormatAttribute =
(ExifAttribute) mAttributes[imageType].get(TAG_JPEG_INTERCHANGE_FORMAT);
if (jpegInterchangeFormatAttribute != null) {
int jpegInterchangeFormat =
jpegInterchangeFormatAttribute.getIntValue(mExifByteOrder);
// Searches for SOF marker in JPEG data and updates IMAGE_LENGTH & IMAGE_WIDTH tags
getJpegAttributes(in, jpegInterchangeFormat, imageType);
}
}
}
// Sets thumbnail offset & length attributes based on JpegInterchangeFormat or StripOffsets tags
private void setThumbnailData(ByteOrderedDataInputStream in) throws IOException {
HashMap thumbnailData = mAttributes[IFD_TYPE_THUMBNAIL];
ExifAttribute compressionAttribute =
(ExifAttribute) thumbnailData.get(TAG_COMPRESSION);
if (compressionAttribute != null) {
mThumbnailCompression = compressionAttribute.getIntValue(mExifByteOrder);
switch (mThumbnailCompression) {
case DATA_JPEG: {
handleThumbnailFromJfif(in, thumbnailData);
break;
}
case DATA_UNCOMPRESSED:
case DATA_JPEG_COMPRESSED: {
if (isSupportedDataType(thumbnailData)) {
handleThumbnailFromStrips(in, thumbnailData);
}
break;
}
}
} else {
// Thumbnail data may not contain Compression tag value
handleThumbnailFromJfif(in, thumbnailData);
}
}
// Check JpegInterchangeFormat(JFIF) tags to retrieve thumbnail offset & length values
// and reads the corresponding bytes if stream does not support seek function
private void handleThumbnailFromJfif(ByteOrderedDataInputStream in, HashMap thumbnailData)
throws IOException {
ExifAttribute jpegInterchangeFormatAttribute =
(ExifAttribute) thumbnailData.get(TAG_JPEG_INTERCHANGE_FORMAT);
ExifAttribute jpegInterchangeFormatLengthAttribute =
(ExifAttribute) thumbnailData.get(TAG_JPEG_INTERCHANGE_FORMAT_LENGTH);
if (jpegInterchangeFormatAttribute != null
&& jpegInterchangeFormatLengthAttribute != null) {
int thumbnailOffset = jpegInterchangeFormatAttribute.getIntValue(mExifByteOrder);
int thumbnailLength = jpegInterchangeFormatLengthAttribute.getIntValue(mExifByteOrder);
// The following code limits the size of thumbnail size not to overflow EXIF data area.
thumbnailLength = Math.min(thumbnailLength, in.getLength() - thumbnailOffset);
if (mMimeType == IMAGE_TYPE_JPEG || mMimeType == IMAGE_TYPE_RAF
|| mMimeType == IMAGE_TYPE_RW2) {
thumbnailOffset += mExifOffset;
} else if (mMimeType == IMAGE_TYPE_ORF) {
// Update offset value since RAF files have IFD data preceding MakerNote data.
thumbnailOffset += mOrfMakerNoteOffset;
}
if (DEBUG) {
Log.d(TAG, "Setting thumbnail attributes with offset: " + thumbnailOffset
+ ", length: " + thumbnailLength);
}
if (thumbnailOffset > 0 && thumbnailLength > 0) {
mHasThumbnail = true;
mThumbnailOffset = thumbnailOffset;
mThumbnailLength = thumbnailLength;
mThumbnailCompression = DATA_JPEG;
if (mFilename == null && mAssetInputStream == null
&& mSeekableFileDescriptor == null) {
// Save the thumbnail in memory if the input doesn't support reading again.
byte[] thumbnailBytes = new byte[thumbnailLength];
in.seek(thumbnailOffset);
in.readFully(thumbnailBytes);
mThumbnailBytes = thumbnailBytes;
}
}
}
}
// Check StripOffsets & StripByteCounts tags to retrieve thumbnail offset & length values
private void handleThumbnailFromStrips(ByteOrderedDataInputStream in, HashMap thumbnailData)
throws IOException {
ExifAttribute stripOffsetsAttribute =
(ExifAttribute) thumbnailData.get(TAG_STRIP_OFFSETS);
ExifAttribute stripByteCountsAttribute =
(ExifAttribute) thumbnailData.get(TAG_STRIP_BYTE_COUNTS);
if (stripOffsetsAttribute != null && stripByteCountsAttribute != null) {
long[] stripOffsets =
convertToLongArray(stripOffsetsAttribute.getValue(mExifByteOrder));
long[] stripByteCounts =
convertToLongArray(stripByteCountsAttribute.getValue(mExifByteOrder));
if (stripOffsets == null) {
Log.w(TAG, "stripOffsets should not be null.");
return;
}
if (stripByteCounts == null) {
Log.w(TAG, "stripByteCounts should not be null.");
return;
}
// Set thumbnail byte array data for non-consecutive strip bytes
byte[] totalStripBytes =
new byte[(int) Arrays.stream(stripByteCounts).sum()];
int bytesRead = 0;
int bytesAdded = 0;
for (int i = 0; i < stripOffsets.length; i++) {
int stripOffset = (int) stripOffsets[i];
int stripByteCount = (int) stripByteCounts[i];
// Skip to offset
int skipBytes = stripOffset - bytesRead;
if (skipBytes < 0) {
Log.d(TAG, "Invalid strip offset value");
}
in.seek(skipBytes);
bytesRead += skipBytes;
// Read strip bytes
byte[] stripBytes = new byte[stripByteCount];
in.read(stripBytes);
bytesRead += stripByteCount;
// Add bytes to array
System.arraycopy(stripBytes, 0, totalStripBytes, bytesAdded,
stripBytes.length);
bytesAdded += stripBytes.length;
}
mHasThumbnail = true;
mThumbnailBytes = totalStripBytes;
mThumbnailLength = totalStripBytes.length;
}
}
// Check if thumbnail data type is currently supported or not
private boolean isSupportedDataType(HashMap thumbnailData) throws IOException {
ExifAttribute bitsPerSampleAttribute =
(ExifAttribute) thumbnailData.get(TAG_BITS_PER_SAMPLE);
if (bitsPerSampleAttribute != null) {
int[] bitsPerSampleValue = (int[]) bitsPerSampleAttribute.getValue(mExifByteOrder);
if (Arrays.equals(BITS_PER_SAMPLE_RGB, bitsPerSampleValue)) {
return true;
}
// See DNG Specification 1.4.0.0. Section 3, Compression.
if (mMimeType == IMAGE_TYPE_DNG) {
ExifAttribute photometricInterpretationAttribute =
(ExifAttribute) thumbnailData.get(TAG_PHOTOMETRIC_INTERPRETATION);
if (photometricInterpretationAttribute != null) {
int photometricInterpretationValue
= photometricInterpretationAttribute.getIntValue(mExifByteOrder);
if ((photometricInterpretationValue == PHOTOMETRIC_INTERPRETATION_BLACK_IS_ZERO
&& Arrays.equals(bitsPerSampleValue, BITS_PER_SAMPLE_GREYSCALE_2))
|| ((photometricInterpretationValue == PHOTOMETRIC_INTERPRETATION_YCBCR)
&& (Arrays.equals(bitsPerSampleValue, BITS_PER_SAMPLE_RGB)))) {
return true;
} else {
// TODO: Add support for lossless Huffman JPEG data
}
}
}
}
if (DEBUG) {
Log.d(TAG, "Unsupported data type value");
}
return false;
}
// Returns true if the image length and width values are <= 512.
// See Section 4.8 of http://standardsproposals.bsigroup.com/Home/getPDF/567
private boolean isThumbnail(HashMap map) throws IOException {
ExifAttribute imageLengthAttribute = (ExifAttribute) map.get(TAG_IMAGE_LENGTH);
ExifAttribute imageWidthAttribute = (ExifAttribute) map.get(TAG_IMAGE_WIDTH);
if (imageLengthAttribute != null && imageWidthAttribute != null) {
int imageLengthValue = imageLengthAttribute.getIntValue(mExifByteOrder);
int imageWidthValue = imageWidthAttribute.getIntValue(mExifByteOrder);
if (imageLengthValue <= MAX_THUMBNAIL_SIZE && imageWidthValue <= MAX_THUMBNAIL_SIZE) {
return true;
}
}
return false;
}
// Validate primary, preview, thumbnail image data by comparing image size
private void validateImages(InputStream in) throws IOException {
// Swap images based on size (primary > preview > thumbnail)
swapBasedOnImageSize(IFD_TYPE_PRIMARY, IFD_TYPE_PREVIEW);
swapBasedOnImageSize(IFD_TYPE_PRIMARY, IFD_TYPE_THUMBNAIL);
swapBasedOnImageSize(IFD_TYPE_PREVIEW, IFD_TYPE_THUMBNAIL);
// Check if image has PixelXDimension/PixelYDimension tags, which contain valid image
// sizes, excluding padding at the right end or bottom end of the image to make sure that
// the values are multiples of 64. See JEITA CP-3451C Table 5 and Section 4.8.1. B.
ExifAttribute pixelXDimAttribute =
(ExifAttribute) mAttributes[IFD_TYPE_EXIF].get(TAG_PIXEL_X_DIMENSION);
ExifAttribute pixelYDimAttribute =
(ExifAttribute) mAttributes[IFD_TYPE_EXIF].get(TAG_PIXEL_Y_DIMENSION);
if (pixelXDimAttribute != null && pixelYDimAttribute != null) {
mAttributes[IFD_TYPE_PRIMARY].put(TAG_IMAGE_WIDTH, pixelXDimAttribute);
mAttributes[IFD_TYPE_PRIMARY].put(TAG_IMAGE_LENGTH, pixelYDimAttribute);
}
// Check whether thumbnail image exists and whether preview image satisfies the thumbnail
// image requirements
if (mAttributes[IFD_TYPE_THUMBNAIL].isEmpty()) {
if (isThumbnail(mAttributes[IFD_TYPE_PREVIEW])) {
mAttributes[IFD_TYPE_THUMBNAIL] = mAttributes[IFD_TYPE_PREVIEW];
mAttributes[IFD_TYPE_PREVIEW] = new HashMap();
}
}
// Check if the thumbnail image satisfies the thumbnail size requirements
if (!isThumbnail(mAttributes[IFD_TYPE_THUMBNAIL])) {
Log.d(TAG, "No image meets the size requirements of a thumbnail image.");
}
}
/**
* If image is uncompressed, ImageWidth/Length tags are used to store size info.
* However, uncompressed images often store extra pixels around the edges of the final image,
* which results in larger values for TAG_IMAGE_WIDTH and TAG_IMAGE_LENGTH tags.
* This method corrects those tag values by checking first the values of TAG_DEFAULT_CROP_SIZE
* See DNG Specification 1.4.0.0. Section 4. (DefaultCropSize)
*
* If image is a RW2 file, valid image sizes are stored in SensorBorder tags.
* See tiff_parser.cc GetFullDimension32()
* */
private void updateImageSizeValues(ByteOrderedDataInputStream in, int imageType)
throws IOException {
// Uncompressed image valid image size values
ExifAttribute defaultCropSizeAttribute =
(ExifAttribute) mAttributes[imageType].get(TAG_DEFAULT_CROP_SIZE);
// RW2 image valid image size values
ExifAttribute topBorderAttribute =
(ExifAttribute) mAttributes[imageType].get(TAG_RW2_SENSOR_TOP_BORDER);
ExifAttribute leftBorderAttribute =
(ExifAttribute) mAttributes[imageType].get(TAG_RW2_SENSOR_LEFT_BORDER);
ExifAttribute bottomBorderAttribute =
(ExifAttribute) mAttributes[imageType].get(TAG_RW2_SENSOR_BOTTOM_BORDER);
ExifAttribute rightBorderAttribute =
(ExifAttribute) mAttributes[imageType].get(TAG_RW2_SENSOR_RIGHT_BORDER);
if (defaultCropSizeAttribute != null) {
// Update for uncompressed image
ExifAttribute defaultCropSizeXAttribute, defaultCropSizeYAttribute;
if (defaultCropSizeAttribute.format == IFD_FORMAT_URATIONAL) {
Rational[] defaultCropSizeValue =
(Rational[]) defaultCropSizeAttribute.getValue(mExifByteOrder);
defaultCropSizeXAttribute =
ExifAttribute.createURational(defaultCropSizeValue[0], mExifByteOrder);
defaultCropSizeYAttribute =
ExifAttribute.createURational(defaultCropSizeValue[1], mExifByteOrder);
} else {
int[] defaultCropSizeValue =
(int[]) defaultCropSizeAttribute.getValue(mExifByteOrder);
defaultCropSizeXAttribute =
ExifAttribute.createUShort(defaultCropSizeValue[0], mExifByteOrder);
defaultCropSizeYAttribute =
ExifAttribute.createUShort(defaultCropSizeValue[1], mExifByteOrder);
}
mAttributes[imageType].put(TAG_IMAGE_WIDTH, defaultCropSizeXAttribute);
mAttributes[imageType].put(TAG_IMAGE_LENGTH, defaultCropSizeYAttribute);
} else if (topBorderAttribute != null && leftBorderAttribute != null &&
bottomBorderAttribute != null && rightBorderAttribute != null) {
// Update for RW2 image
int topBorderValue = topBorderAttribute.getIntValue(mExifByteOrder);
int bottomBorderValue = bottomBorderAttribute.getIntValue(mExifByteOrder);
int rightBorderValue = rightBorderAttribute.getIntValue(mExifByteOrder);
int leftBorderValue = leftBorderAttribute.getIntValue(mExifByteOrder);
if (bottomBorderValue > topBorderValue && rightBorderValue > leftBorderValue) {
int length = bottomBorderValue - topBorderValue;
int width = rightBorderValue - leftBorderValue;
ExifAttribute imageLengthAttribute =
ExifAttribute.createUShort(length, mExifByteOrder);
ExifAttribute imageWidthAttribute =
ExifAttribute.createUShort(width, mExifByteOrder);
mAttributes[imageType].put(TAG_IMAGE_LENGTH, imageLengthAttribute);
mAttributes[imageType].put(TAG_IMAGE_WIDTH, imageWidthAttribute);
}
} else {
retrieveJpegImageSize(in, imageType);
}
}
// Writes an Exif segment into the given output stream.
private int writeExifSegment(ByteOrderedDataOutputStream dataOutputStream,
int exifOffsetFromBeginning) throws IOException {
// The following variables are for calculating each IFD tag group size in bytes.
int[] ifdOffsets = new int[EXIF_TAGS.length];
int[] ifdDataSizes = new int[EXIF_TAGS.length];
// Remove IFD pointer tags (we'll re-add it later.)
for (ExifTag tag : EXIF_POINTER_TAGS) {
removeAttribute(tag.name);
}
// Remove old thumbnail data
removeAttribute(JPEG_INTERCHANGE_FORMAT_TAG.name);
removeAttribute(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name);
// Remove null value tags.
for (int ifdType = 0; ifdType < EXIF_TAGS.length; ++ifdType) {
for (Object obj : mAttributes[ifdType].entrySet().toArray()) {
final Map.Entry entry = (Map.Entry) obj;
if (entry.getValue() == null) {
mAttributes[ifdType].remove(entry.getKey());
}
}
}
// Add IFD pointer tags. The next offset of primary image TIFF IFD will have thumbnail IFD
// offset when there is one or more tags in the thumbnail IFD.
if (!mAttributes[IFD_TYPE_EXIF].isEmpty()) {
mAttributes[IFD_TYPE_PRIMARY].put(EXIF_POINTER_TAGS[1].name,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (!mAttributes[IFD_TYPE_GPS].isEmpty()) {
mAttributes[IFD_TYPE_PRIMARY].put(EXIF_POINTER_TAGS[2].name,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (!mAttributes[IFD_TYPE_INTEROPERABILITY].isEmpty()) {
mAttributes[IFD_TYPE_EXIF].put(EXIF_POINTER_TAGS[3].name,
ExifAttribute.createULong(0, mExifByteOrder));
}
if (mHasThumbnail) {
mAttributes[IFD_TYPE_THUMBNAIL].put(JPEG_INTERCHANGE_FORMAT_TAG.name,
ExifAttribute.createULong(0, mExifByteOrder));
mAttributes[IFD_TYPE_THUMBNAIL].put(JPEG_INTERCHANGE_FORMAT_LENGTH_TAG.name,
ExifAttribute.createULong(mThumbnailLength, mExifByteOrder));
}
// Calculate IFD group data area sizes. IFD group data area is assigned to save the entry
// value which has a bigger size than 4 bytes.
for (int i = 0; i < EXIF_TAGS.length; ++i) {
int sum = 0;
for (Map.Entry entry : (Set<Map.Entry>) mAttributes[i].entrySet()) {
final ExifAttribute exifAttribute = (ExifAttribute) entry.getValue();
final int size = exifAttribute.size();
if (size > 4) {
sum += size;
}
}
ifdDataSizes[i] += sum;
}
// Calculate IFD offsets.
int position = 8;
for (int ifdType = 0; ifdType < EXIF_TAGS.length; ++ifdType) {
if (!mAttributes[ifdType].isEmpty()) {
ifdOffsets[ifdType] = position;
position += 2 + mAttributes[ifdType].size() * 12 + 4 + ifdDataSizes[ifdType];
}
}
if (mHasThumbnail) {
int thumbnailOffset = position;
mAttributes[IFD_TYPE_THUMBNAIL].put(JPEG_INTERCHANGE_FORMAT_TAG.name,
ExifAttribute.createULong(thumbnailOffset, mExifByteOrder));
mThumbnailOffset = exifOffsetFromBeginning + thumbnailOffset;
position += mThumbnailLength;
}
// Calculate the total size
int totalSize = position + 8; // eight bytes is for header part.
if (DEBUG) {
Log.d(TAG, "totalSize length: " + totalSize);
for (int i = 0; i < EXIF_TAGS.length; ++i) {
Log.d(TAG, String.format("index: %d, offsets: %d, tag count: %d, data sizes: %d",
i, ifdOffsets[i], mAttributes[i].size(), ifdDataSizes[i]));
}
}
// Update IFD pointer tags with the calculated offsets.
if (!mAttributes[IFD_TYPE_EXIF].isEmpty()) {
mAttributes[IFD_TYPE_PRIMARY].put(EXIF_POINTER_TAGS[1].name,
ExifAttribute.createULong(ifdOffsets[IFD_TYPE_EXIF], mExifByteOrder));
}
if (!mAttributes[IFD_TYPE_GPS].isEmpty()) {
mAttributes[IFD_TYPE_PRIMARY].put(EXIF_POINTER_TAGS[2].name,
ExifAttribute.createULong(ifdOffsets[IFD_TYPE_GPS], mExifByteOrder));
}
if (!mAttributes[IFD_TYPE_INTEROPERABILITY].isEmpty()) {
mAttributes[IFD_TYPE_EXIF].put(EXIF_POINTER_TAGS[3].name, ExifAttribute.createULong(
ifdOffsets[IFD_TYPE_INTEROPERABILITY], mExifByteOrder));
}
// Write TIFF Headers. See JEITA CP-3451C Section 4.5.2. Table 1.
dataOutputStream.writeUnsignedShort(totalSize);
dataOutputStream.write(IDENTIFIER_EXIF_APP1);
dataOutputStream.writeShort(mExifByteOrder == ByteOrder.BIG_ENDIAN
? BYTE_ALIGN_MM : BYTE_ALIGN_II);
dataOutputStream.setByteOrder(mExifByteOrder);
dataOutputStream.writeUnsignedShort(START_CODE);
dataOutputStream.writeUnsignedInt(IFD_OFFSET);
// Write IFD groups. See JEITA CP-3451C Section 4.5.8. Figure 9.
for (int ifdType = 0; ifdType < EXIF_TAGS.length; ++ifdType) {
if (!mAttributes[ifdType].isEmpty()) {
// See JEITA CP-3451C Section 4.6.2: IFD structure.
// Write entry count
dataOutputStream.writeUnsignedShort(mAttributes[ifdType].size());
// Write entry info
int dataOffset = ifdOffsets[ifdType] + 2 + mAttributes[ifdType].size() * 12 + 4;
for (Map.Entry entry : (Set<Map.Entry>) mAttributes[ifdType].entrySet()) {
// Convert tag name to tag number.
final ExifTag tag =
(ExifTag) sExifTagMapsForWriting[ifdType].get(entry.getKey());
final int tagNumber = tag.number;
final ExifAttribute attribute = (ExifAttribute) entry.getValue();
final int size = attribute.size();
dataOutputStream.writeUnsignedShort(tagNumber);
dataOutputStream.writeUnsignedShort(attribute.format);
dataOutputStream.writeInt(attribute.numberOfComponents);
if (size > 4) {
dataOutputStream.writeUnsignedInt(dataOffset);
dataOffset += size;
} else {
dataOutputStream.write(attribute.bytes);
// Fill zero up to 4 bytes
if (size < 4) {
for (int i = size; i < 4; ++i) {
dataOutputStream.writeByte(0);
}
}
}
}
// Write the next offset. It writes the offset of thumbnail IFD if there is one or
// more tags in the thumbnail IFD when the current IFD is the primary image TIFF
// IFD; Otherwise 0.
if (ifdType == 0 && !mAttributes[IFD_TYPE_THUMBNAIL].isEmpty()) {
dataOutputStream.writeUnsignedInt(ifdOffsets[IFD_TYPE_THUMBNAIL]);
} else {
dataOutputStream.writeUnsignedInt(0);
}
// Write values of data field exceeding 4 bytes after the next offset.
for (Map.Entry entry : (Set<Map.Entry>) mAttributes[ifdType].entrySet()) {
ExifAttribute attribute = (ExifAttribute) entry.getValue();
if (attribute.bytes.length > 4) {
dataOutputStream.write(attribute.bytes, 0, attribute.bytes.length);
}
}
}
}
// Write thumbnail
if (mHasThumbnail) {
dataOutputStream.write(getThumbnailBytes());
}
// Reset the byte order to big endian in order to write remaining parts of the JPEG file.
dataOutputStream.setByteOrder(ByteOrder.BIG_ENDIAN);
return totalSize;
}
/**
* Determines the data format of EXIF entry value.
*
* @param entryValue The value to be determined.
* @return Returns two data formats gussed as a pair in integer. If there is no two candidate
data formats for the given entry value, returns {@code -1} in the second of the pair.
*/
private static Pair<Integer, Integer> guessDataFormat(String entryValue) {
// See TIFF 6.0 Section 2, "Image File Directory".
// Take the first component if there are more than one component.
if (entryValue.contains(",")) {
String[] entryValues = entryValue.split(",");
Pair<Integer, Integer> dataFormat = guessDataFormat(entryValues[0]);
if (dataFormat.first == IFD_FORMAT_STRING) {
return dataFormat;
}
for (int i = 1; i < entryValues.length; ++i) {
final Pair<Integer, Integer> guessDataFormat = guessDataFormat(entryValues[i]);
int first = -1, second = -1;
if (guessDataFormat.first == dataFormat.first
|| guessDataFormat.second == dataFormat.first) {
first = dataFormat.first;
}
if (dataFormat.second != -1 && (guessDataFormat.first == dataFormat.second
|| guessDataFormat.second == dataFormat.second)) {
second = dataFormat.second;
}
if (first == -1 && second == -1) {
return new Pair<>(IFD_FORMAT_STRING, -1);
}
if (first == -1) {
dataFormat = new Pair<>(second, -1);
continue;
}
if (second == -1) {
dataFormat = new Pair<>(first, -1);
continue;
}
}
return dataFormat;
}
if (entryValue.contains("/")) {
String[] rationalNumber = entryValue.split("/");
if (rationalNumber.length == 2) {
try {
long numerator = (long) Double.parseDouble(rationalNumber[0]);
long denominator = (long) Double.parseDouble(rationalNumber[1]);
if (numerator < 0L || denominator < 0L) {
return new Pair<>(IFD_FORMAT_SRATIONAL, -1);
}
if (numerator > Integer.MAX_VALUE || denominator > Integer.MAX_VALUE) {
return new Pair<>(IFD_FORMAT_URATIONAL, -1);
}
return new Pair<>(IFD_FORMAT_SRATIONAL, IFD_FORMAT_URATIONAL);
} catch (NumberFormatException e) {
// Ignored
}
}
return new Pair<>(IFD_FORMAT_STRING, -1);
}
try {
Long longValue = Long.parseLong(entryValue);
if (longValue >= 0 && longValue <= 65535) {
return new Pair<>(IFD_FORMAT_USHORT, IFD_FORMAT_ULONG);
}
if (longValue < 0) {
return new Pair<>(IFD_FORMAT_SLONG, -1);
}
return new Pair<>(IFD_FORMAT_ULONG, -1);
} catch (NumberFormatException e) {
// Ignored
}
try {
Double.parseDouble(entryValue);
return new Pair<>(IFD_FORMAT_DOUBLE, -1);
} catch (NumberFormatException e) {
// Ignored
}
return new Pair<>(IFD_FORMAT_STRING, -1);
}
// An input stream to parse EXIF data area, which can be written in either little or big endian
// order.
private static class ByteOrderedDataInputStream extends InputStream implements DataInput {
private static final ByteOrder LITTLE_ENDIAN = ByteOrder.LITTLE_ENDIAN;
private static final ByteOrder BIG_ENDIAN = ByteOrder.BIG_ENDIAN;
private DataInputStream mDataInputStream;
private InputStream mInputStream;
private ByteOrder mByteOrder = ByteOrder.BIG_ENDIAN;
private final int mLength;
private int mPosition;
public ByteOrderedDataInputStream(InputStream in) throws IOException {
mInputStream = in;
mDataInputStream = new DataInputStream(in);
mLength = mDataInputStream.available();
mPosition = 0;
mDataInputStream.mark(mLength);
}
public ByteOrderedDataInputStream(byte[] bytes) throws IOException {
this(new ByteArrayInputStream(bytes));
}
public void setByteOrder(ByteOrder byteOrder) {
mByteOrder = byteOrder;
}
public void seek(long byteCount) throws IOException {
if (mPosition > byteCount) {
mPosition = 0;
mDataInputStream.reset();
mDataInputStream.mark(mLength);
} else {
byteCount -= mPosition;
}
if (skipBytes((int) byteCount) != (int) byteCount) {
throw new IOException("Couldn't seek up to the byteCount");
}
}
public int peek() {
return mPosition;
}
@Override
public int available() throws IOException {
return mDataInputStream.available();
}
@Override
public int read() throws IOException {
++mPosition;
return mDataInputStream.read();
}
@Override
public int readUnsignedByte() throws IOException {
++mPosition;
return mDataInputStream.readUnsignedByte();
}
@Override
public String readLine() throws IOException {
Log.d(TAG, "Currently unsupported");
return null;
}
@Override
public boolean readBoolean() throws IOException {
++mPosition;
return mDataInputStream.readBoolean();
}
@Override
public char readChar() throws IOException {
mPosition += 2;
return mDataInputStream.readChar();
}
@Override
public String readUTF() throws IOException {
mPosition += 2;
return mDataInputStream.readUTF();
}
@Override
public void readFully(byte[] buffer, int offset, int length) throws IOException {
mPosition += length;
if (mPosition > mLength) {
throw new EOFException();
}
if (mDataInputStream.read(buffer, offset, length) != length) {
throw new IOException("Couldn't read up to the length of buffer");
}
}
@Override
public void readFully(byte[] buffer) throws IOException {
mPosition += buffer.length;
if (mPosition > mLength) {
throw new EOFException();
}
if (mDataInputStream.read(buffer, 0, buffer.length) != buffer.length) {
throw new IOException("Couldn't read up to the length of buffer");
}
}
@Override
public byte readByte() throws IOException {
++mPosition;
if (mPosition > mLength) {
throw new EOFException();
}
int ch = mDataInputStream.read();
if (ch < 0) {
throw new EOFException();
}
return (byte) ch;
}
@Override
public short readShort() throws IOException {
mPosition += 2;
if (mPosition > mLength) {
throw new EOFException();
}
int ch1 = mDataInputStream.read();
int ch2 = mDataInputStream.read();
if ((ch1 | ch2) < 0) {
throw new EOFException();
}
if (mByteOrder == LITTLE_ENDIAN) {
return (short) ((ch2 << 8) + (ch1));
} else if (mByteOrder == BIG_ENDIAN) {
return (short) ((ch1 << 8) + (ch2));
}
throw new IOException("Invalid byte order: " + mByteOrder);
}
@Override
public int readInt() throws IOException {
mPosition += 4;
if (mPosition > mLength) {
throw new EOFException();
}
int ch1 = mDataInputStream.read();
int ch2 = mDataInputStream.read();
int ch3 = mDataInputStream.read();
int ch4 = mDataInputStream.read();
if ((ch1 | ch2 | ch3 | ch4) < 0) {
throw new EOFException();
}
if (mByteOrder == LITTLE_ENDIAN) {
return ((ch4 << 24) + (ch3 << 16) + (ch2 << 8) + ch1);
} else if (mByteOrder == BIG_ENDIAN) {
return ((ch1 << 24) + (ch2 << 16) + (ch3 << 8) + ch4);
}
throw new IOException("Invalid byte order: " + mByteOrder);
}
@Override
public int skipBytes(int byteCount) throws IOException {
int totalSkip = Math.min(byteCount, mLength - mPosition);
int skipped = 0;
while (skipped < totalSkip) {
skipped += mDataInputStream.skipBytes(totalSkip - skipped);
}
mPosition += skipped;
return skipped;
}
public int readUnsignedShort() throws IOException {
mPosition += 2;
if (mPosition > mLength) {
throw new EOFException();
}
int ch1 = mDataInputStream.read();
int ch2 = mDataInputStream.read();
if ((ch1 | ch2) < 0) {
throw new EOFException();
}
if (mByteOrder == LITTLE_ENDIAN) {
return ((ch2 << 8) + (ch1));
} else if (mByteOrder == BIG_ENDIAN) {
return ((ch1 << 8) + (ch2));
}
throw new IOException("Invalid byte order: " + mByteOrder);
}
public long readUnsignedInt() throws IOException {
return readInt() & 0xffffffffL;
}
@Override
public long readLong() throws IOException {
mPosition += 8;
if (mPosition > mLength) {
throw new EOFException();
}
int ch1 = mDataInputStream.read();
int ch2 = mDataInputStream.read();
int ch3 = mDataInputStream.read();
int ch4 = mDataInputStream.read();
int ch5 = mDataInputStream.read();
int ch6 = mDataInputStream.read();
int ch7 = mDataInputStream.read();
int ch8 = mDataInputStream.read();
if ((ch1 | ch2 | ch3 | ch4 | ch5 | ch6 | ch7 | ch8) < 0) {
throw new EOFException();
}
if (mByteOrder == LITTLE_ENDIAN) {
return (((long) ch8 << 56) + ((long) ch7 << 48) + ((long) ch6 << 40)
+ ((long) ch5 << 32) + ((long) ch4 << 24) + ((long) ch3 << 16)
+ ((long) ch2 << 8) + (long) ch1);
} else if (mByteOrder == BIG_ENDIAN) {
return (((long) ch1 << 56) + ((long) ch2 << 48) + ((long) ch3 << 40)
+ ((long) ch4 << 32) + ((long) ch5 << 24) + ((long) ch6 << 16)
+ ((long) ch7 << 8) + (long) ch8);
}
throw new IOException("Invalid byte order: " + mByteOrder);
}
@Override
public float readFloat() throws IOException {
return Float.intBitsToFloat(readInt());
}
@Override
public double readDouble() throws IOException {
return Double.longBitsToDouble(readLong());
}
public int getLength() {
return mLength;
}
}
// An output stream to write EXIF data area, which can be written in either little or big endian
// order.
private static class ByteOrderedDataOutputStream extends FilterOutputStream {
private final OutputStream mOutputStream;
private ByteOrder mByteOrder;
public ByteOrderedDataOutputStream(OutputStream out, ByteOrder byteOrder) {
super(out);
mOutputStream = out;
mByteOrder = byteOrder;
}
public void setByteOrder(ByteOrder byteOrder) {
mByteOrder = byteOrder;
}
public void write(byte[] bytes) throws IOException {
mOutputStream.write(bytes);
}
public void write(byte[] bytes, int offset, int length) throws IOException {
mOutputStream.write(bytes, offset, length);
}
public void writeByte(int val) throws IOException {
mOutputStream.write(val);
}
public void writeShort(short val) throws IOException {
if (mByteOrder == ByteOrder.LITTLE_ENDIAN) {
mOutputStream.write((val >>> 0) & 0xFF);
mOutputStream.write((val >>> 8) & 0xFF);
} else if (mByteOrder == ByteOrder.BIG_ENDIAN) {
mOutputStream.write((val >>> 8) & 0xFF);
mOutputStream.write((val >>> 0) & 0xFF);
}
}
public void writeInt(int val) throws IOException {
if (mByteOrder == ByteOrder.LITTLE_ENDIAN) {
mOutputStream.write((val >>> 0) & 0xFF);
mOutputStream.write((val >>> 8) & 0xFF);
mOutputStream.write((val >>> 16) & 0xFF);
mOutputStream.write((val >>> 24) & 0xFF);
} else if (mByteOrder == ByteOrder.BIG_ENDIAN) {
mOutputStream.write((val >>> 24) & 0xFF);
mOutputStream.write((val >>> 16) & 0xFF);
mOutputStream.write((val >>> 8) & 0xFF);
mOutputStream.write((val >>> 0) & 0xFF);
}
}
public void writeUnsignedShort(int val) throws IOException {
writeShort((short) val);
}
public void writeUnsignedInt(long val) throws IOException {
writeInt((int) val);
}
}
// Swaps image data based on image size
private void swapBasedOnImageSize(@IfdType int firstIfdType, @IfdType int secondIfdType)
throws IOException {
if (mAttributes[firstIfdType].isEmpty() || mAttributes[secondIfdType].isEmpty()) {
if (DEBUG) {
Log.d(TAG, "Cannot perform swap since only one image data exists");
}
return;
}
ExifAttribute firstImageLengthAttribute =
(ExifAttribute) mAttributes[firstIfdType].get(TAG_IMAGE_LENGTH);
ExifAttribute firstImageWidthAttribute =
(ExifAttribute) mAttributes[firstIfdType].get(TAG_IMAGE_WIDTH);
ExifAttribute secondImageLengthAttribute =
(ExifAttribute) mAttributes[secondIfdType].get(TAG_IMAGE_LENGTH);
ExifAttribute secondImageWidthAttribute =
(ExifAttribute) mAttributes[secondIfdType].get(TAG_IMAGE_WIDTH);
if (firstImageLengthAttribute == null || firstImageWidthAttribute == null) {
if (DEBUG) {
Log.d(TAG, "First image does not contain valid size information");
}
} else if (secondImageLengthAttribute == null || secondImageWidthAttribute == null) {
if (DEBUG) {
Log.d(TAG, "Second image does not contain valid size information");
}
} else {
int firstImageLengthValue = firstImageLengthAttribute.getIntValue(mExifByteOrder);
int firstImageWidthValue = firstImageWidthAttribute.getIntValue(mExifByteOrder);
int secondImageLengthValue = secondImageLengthAttribute.getIntValue(mExifByteOrder);
int secondImageWidthValue = secondImageWidthAttribute.getIntValue(mExifByteOrder);
if (firstImageLengthValue < secondImageLengthValue &&
firstImageWidthValue < secondImageWidthValue) {
HashMap tempMap = mAttributes[firstIfdType];
mAttributes[firstIfdType] = mAttributes[secondIfdType];
mAttributes[secondIfdType] = tempMap;
}
}
}
// Checks if there is a match
private boolean containsMatch(byte[] mainBytes, byte[] findBytes) {
for (int i = 0; i < mainBytes.length - findBytes.length; i++) {
for (int j = 0; j < findBytes.length; j++) {
if (mainBytes[i + j] != findBytes[j]) {
break;
}
if (j == findBytes.length - 1) {
return true;
}
}
}
return false;
}
/**
* Convert given int[] to long[]. If long[] is given, just return it.
* Return null for other types of input.
*/
private static long[] convertToLongArray(Object inputObj) {
if (inputObj instanceof int[]) {
int[] input = (int[]) inputObj;
long[] result = new long[input.length];
for (int i = 0; i < input.length; i++) {
result[i] = input[i];
}
return result;
} else if (inputObj instanceof long[]) {
return (long[]) inputObj;
}
return null;
}
}