media/jni/android_media_ExifInterface.cpp - LeafOS-Project/android_frameworks_base - Gitiles

 /*
  * Copyright 2016 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.
  */

 //#define LOG_NDEBUG 0
 #define LOG_TAG "ExifInterface_JNI"

 #include "android_media_Utils.h"

 #include "android/graphics/CreateJavaOutputStreamAdaptor.h"
 #include "src/piex_types.h"
 #include "src/piex.h"

 #include <jni.h>
 #include <JNIHelp.h>
 #include <androidfw/Asset.h>
 #include <android_runtime/AndroidRuntime.h>
 #include <android/graphics/Utils.h>
 #include <nativehelper/ScopedLocalRef.h>

 #include <utils/Log.h>
 #include <utils/String8.h>
 #include <utils/KeyedVector.h>

 // ----------------------------------------------------------------------------

 using namespace android;

 static const char kJpegSignatureChars[] = {(char)0xff, (char)0xd8, (char)0xff};
 static const int kJpegSignatureSize = 3;

 #define FIND_CLASS(var, className) \
     var = env->FindClass(className); \
     LOG_FATAL_IF(! var, "Unable to find class " className);

 #define GET_METHOD_ID(var, clazz, fieldName, fieldDescriptor) \
     var = env->GetMethodID(clazz, fieldName, fieldDescriptor); \
     LOG_FATAL_IF(! var, "Unable to find method " fieldName);

 struct HashMapFields {
     jmethodID init;
     jmethodID put;
 };

 struct fields_t {
     HashMapFields hashMap;
     jclass hashMapClassId;
 };

 static fields_t gFields;

 static jobject KeyedVectorToHashMap(JNIEnv *env, KeyedVector<String8, String8> const &map) {
     jclass clazz = gFields.hashMapClassId;
     jobject hashMap = env->NewObject(clazz, gFields.hashMap.init);
     for (size_t i = 0; i < map.size(); ++i) {
         jstring jkey = env->NewStringUTF(map.keyAt(i).string());
         jstring jvalue = env->NewStringUTF(map.valueAt(i).string());
         env->CallObjectMethod(hashMap, gFields.hashMap.put, jkey, jvalue);
         env->DeleteLocalRef(jkey);
         env->DeleteLocalRef(jvalue);
     }
     return hashMap;
 }

 extern "C" {

 // -------------------------- ExifInterface methods ---------------------------

 static void ExifInterface_initRaw(JNIEnv *env) {
     jclass clazz;
     FIND_CLASS(clazz, "java/util/HashMap");
     gFields.hashMapClassId = static_cast<jclass>(env->NewGlobalRef(clazz));

     GET_METHOD_ID(gFields.hashMap.init, clazz, "<init>", "()V");
     GET_METHOD_ID(gFields.hashMap.put, clazz, "put",
                   "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
 }

 static bool is_asset_stream(const SkStream& stream) {
     return stream.hasLength() && stream.hasPosition();
 }

 static jobject ExifInterface_getThumbnailFromAsset(
         JNIEnv* env, jclass /* clazz */, jlong jasset, jint jthumbnailOffset,
         jint jthumbnailLength) {
     Asset* asset = reinterpret_cast<Asset*>(jasset);
     std::unique_ptr<AssetStreamAdaptor> stream(new AssetStreamAdaptor(asset));

     std::unique_ptr<jbyte[]> thumbnailData(new jbyte[(int)jthumbnailLength]);
     if (thumbnailData.get() == NULL) {
         ALOGI("No memory to get thumbnail");
         return NULL;
     }

     // Do not know the current offset. So rewind it.
     stream->rewind();

     // Read thumbnail.
     stream->skip((int)jthumbnailOffset);
     stream->read((void*)thumbnailData.get(), (int)jthumbnailLength);

     // Copy to the byte array.
     jbyteArray byteArray = env->NewByteArray(jthumbnailLength);
     env->SetByteArrayRegion(byteArray, 0, jthumbnailLength, thumbnailData.get());
     return byteArray;
 }

 static jobject getRawAttributes(JNIEnv* env, SkStream* stream, bool returnThumbnail) {
     std::unique_ptr<SkStream> streamDeleter(stream);

     std::unique_ptr<::piex::StreamInterface> piexStream;
     if (is_asset_stream(*stream)) {
         piexStream.reset(new AssetStream(streamDeleter.release()));
     } else {
         piexStream.reset(new BufferedStream(streamDeleter.release()));
     }

     piex::PreviewImageData image_data;

     if (!GetExifFromRawImage(piexStream.get(), String8("[piex stream]"), image_data)) {
         ALOGI("Raw image not detected");
         return NULL;
     }

     KeyedVector<String8, String8> map;

     if (image_data.thumbnail.length > 0
             && image_data.thumbnail.format == ::piex::Image::kJpegCompressed) {
         map.add(String8("HasThumbnail"), String8("true"));
         map.add(String8("ThumbnailOffset"), String8::format("%d", image_data.thumbnail.offset));
         map.add(String8("ThumbnailLength"), String8::format("%d", image_data.thumbnail.length));
     } else {
         map.add(String8("HasThumbnail"), String8("false"));
     }

     map.add(
             String8("Orientation"),
             String8::format("%u", image_data.exif_orientation));
     map.add(
             String8("ImageWidth"),
             String8::format("%u", image_data.full_width));
     map.add(
             String8("ImageLength"),
             String8::format("%u", image_data.full_height));

     // Current PIEX does not have LightSource information while JPEG version of
     // EXIFInterface always declares the light source field. For the
     // compatibility, it provides the default value of the light source field.
     map.add(String8("LightSource"), String8("0"));

     if (!image_data.maker.empty()) {
         map.add(String8("Make"), String8(image_data.maker.c_str()));
     }

     if (!image_data.model.empty()) {
         map.add(String8("Model"), String8(image_data.model.c_str()));
     }

     if (!image_data.date_time.empty()) {
         map.add(String8("DateTime"), String8(image_data.date_time.c_str()));
     }

     if (image_data.iso) {
         map.add(
                 String8("ISOSpeedRatings"),
                 String8::format("%u", image_data.iso));
     }

     if (image_data.exposure_time.numerator != 0
             && image_data.exposure_time.denominator != 0) {
         double exposureTime =
             (double)image_data.exposure_time.numerator
             / image_data.exposure_time.denominator;

         const char* format;
         if (exposureTime < 0.01) {
             format = "%6.4f";
         } else {
             format = "%5.3f";
         }
         map.add(String8("ExposureTime"), String8::format(format, exposureTime));
     }

     if (image_data.fnumber.numerator != 0
             && image_data.fnumber.denominator != 0) {
         double fnumber =
             (double)image_data.fnumber.numerator
             / image_data.fnumber.denominator;
         map.add(String8("FNumber"), String8::format("%5.3f", fnumber));
     }

     if (image_data.focal_length.numerator != 0
             && image_data.focal_length.denominator != 0) {
         map.add(
                 String8("FocalLength"),
                 String8::format(
                         "%u/%u",
                         image_data.focal_length.numerator,
                         image_data.focal_length.denominator));
     }

     if (image_data.gps.is_valid) {
         if (image_data.gps.latitude[0].denominator != 0
                 && image_data.gps.latitude[1].denominator != 0
                 && image_data.gps.latitude[2].denominator != 0) {
             map.add(
                     String8("GPSLatitude"),
                     String8::format(
                             "%u/%u,%u/%u,%u/%u",
                             image_data.gps.latitude[0].numerator,
                             image_data.gps.latitude[0].denominator,
                             image_data.gps.latitude[1].numerator,
                             image_data.gps.latitude[1].denominator,
                             image_data.gps.latitude[2].numerator,
                             image_data.gps.latitude[2].denominator));
         }

         if (image_data.gps.latitude_ref) {
             char str[2];
             str[0] = image_data.gps.latitude_ref;
             str[1] = 0;
             map.add(String8("GPSLatitudeRef"), String8(str));
         }

         if (image_data.gps.longitude[0].denominator != 0
                 && image_data.gps.longitude[1].denominator != 0
                 && image_data.gps.longitude[2].denominator != 0) {
             map.add(
                     String8("GPSLongitude"),
                     String8::format(
                             "%u/%u,%u/%u,%u/%u",
                             image_data.gps.longitude[0].numerator,
                             image_data.gps.longitude[0].denominator,
                             image_data.gps.longitude[1].numerator,
                             image_data.gps.longitude[1].denominator,
                             image_data.gps.longitude[2].numerator,
                             image_data.gps.longitude[2].denominator));
         }

         if (image_data.gps.longitude_ref) {
             char str[2];
             str[0] = image_data.gps.longitude_ref;
             str[1] = 0;
             map.add(String8("GPSLongitudeRef"), String8(str));
         }

         if (image_data.gps.altitude.denominator != 0) {
             map.add(
                     String8("GPSAltitude"),
                     String8::format("%u/%u",
                             image_data.gps.altitude.numerator,
                             image_data.gps.altitude.denominator));

             map.add(
                     String8("GPSAltitudeRef"),
                     String8(image_data.gps.altitude_ref ? "1" : "0"));
         }

         if (image_data.gps.time_stamp[0].denominator != 0
                 && image_data.gps.time_stamp[1].denominator != 0
                 && image_data.gps.time_stamp[2].denominator != 0) {
             map.add(
                     String8("GPSTimeStamp"),
                     String8::format(
                             "%02u:%02u:%02u",
                             image_data.gps.time_stamp[0].numerator
                             / image_data.gps.time_stamp[0].denominator,
                             image_data.gps.time_stamp[1].numerator
                             / image_data.gps.time_stamp[1].denominator,
                             image_data.gps.time_stamp[2].numerator
                             / image_data.gps.time_stamp[2].denominator));
         }

         if (!image_data.gps.date_stamp.empty()) {
             map.add(
                     String8("GPSDateStamp"),
                     String8(image_data.gps.date_stamp.c_str()));
         }
     }

     jobject hashMap = KeyedVectorToHashMap(env, map);

     if (returnThumbnail) {
         std::unique_ptr<jbyte[]> thumbnailData(new jbyte[image_data.thumbnail.length]);
         if (thumbnailData.get() == NULL) {
             ALOGE("No memory to parse a thumbnail");
             return NULL;
         }
         jbyteArray jthumbnailByteArray = env->NewByteArray(image_data.thumbnail.length);
         if (jthumbnailByteArray == NULL) {
             ALOGE("No memory to parse a thumbnail");
             return NULL;
         }
         piexStream.get()->GetData(image_data.thumbnail.offset, image_data.thumbnail.length,
                 (uint8_t*)thumbnailData.get());
         env->SetByteArrayRegion(
                 jthumbnailByteArray, 0, image_data.thumbnail.length, thumbnailData.get());
         jstring jkey = env->NewStringUTF(String8("ThumbnailData"));
         env->CallObjectMethod(hashMap, gFields.hashMap.put, jkey, jthumbnailByteArray);
         env->DeleteLocalRef(jkey);
         env->DeleteLocalRef(jthumbnailByteArray);
     }
     return hashMap;
 }

 static jobject ExifInterface_getRawAttributesFromAsset(
         JNIEnv* env, jclass /* clazz */, jlong jasset) {
     std::unique_ptr<char[]> jpegSignature(new char[kJpegSignatureSize]);
     if (jpegSignature.get() == NULL) {
         ALOGE("No enough memory to parse");
         return NULL;
     }

     Asset* asset = reinterpret_cast<Asset*>(jasset);
     std::unique_ptr<AssetStreamAdaptor> stream(new AssetStreamAdaptor(asset));

     if (stream.get()->read(jpegSignature.get(), kJpegSignatureSize) != kJpegSignatureSize) {
         // Rewind the stream.
         stream.get()->rewind();

         ALOGI("Corrupted image.");
         return NULL;
     }

     // Rewind the stream.
     stream.get()->rewind();

     if (memcmp(jpegSignature.get(), kJpegSignatureChars, kJpegSignatureSize) == 0) {
         ALOGI("Should be a JPEG stream.");
         return NULL;
     }

     // Try to parse from the given stream.
     jobject result = getRawAttributes(env, stream.get(), false);

     // Rewind the stream for the chance to read JPEG.
     if (result == NULL) {
         stream.get()->rewind();
     }
     return result;
 }

 static jobject ExifInterface_getRawAttributesFromFileDescriptor(
         JNIEnv* env, jclass /* clazz */, jobject jfileDescriptor) {
     std::unique_ptr<char[]> jpegSignature(new char[kJpegSignatureSize]);
     if (jpegSignature.get() == NULL) {
         ALOGE("No enough memory to parse");
         return NULL;
     }

     int fd = jniGetFDFromFileDescriptor(env, jfileDescriptor);
     if (fd < 0) {
         ALOGI("Invalid file descriptor");
         return NULL;
     }

     // Restore the file descriptor's offset on exiting this function.
     AutoFDSeek autoRestore(fd);

     int dupFd = dup(fd);

     FILE* file = fdopen(dupFd, "r");
     if (file == NULL) {
         ALOGI("Failed to open the file descriptor");
         return NULL;
     }

     if (fgets(jpegSignature.get(), kJpegSignatureSize, file) == NULL) {
         ALOGI("Corrupted image.");
         return NULL;
     }

     if (memcmp(jpegSignature.get(), kJpegSignatureChars, kJpegSignatureSize) == 0) {
         ALOGI("Should be a JPEG stream.");
         return NULL;
     }

     // Rewind the file descriptor.
     fseek(file, 0L, SEEK_SET);

     std::unique_ptr<SkFILEStream> fileStream(new SkFILEStream(file,
                 SkFILEStream::kCallerPasses_Ownership));
     return getRawAttributes(env, fileStream.get(), false);
 }

 static jobject ExifInterface_getRawAttributesFromInputStream(
         JNIEnv* env, jclass /* clazz */, jobject jinputStream) {
     jbyteArray byteArray = env->NewByteArray(8*1024);
     ScopedLocalRef<jbyteArray> scoper(env, byteArray);
     std::unique_ptr<SkStream> stream(CreateJavaInputStreamAdaptor(env, jinputStream, scoper.get()));
     return getRawAttributes(env, stream.get(), true);
 }

 } // extern "C"

 // ----------------------------------------------------------------------------

 static JNINativeMethod gMethods[] = {
     { "nativeInitRaw", "()V", (void *)ExifInterface_initRaw },
     { "nativeGetThumbnailFromAsset", "(JII)[B", (void *)ExifInterface_getThumbnailFromAsset },
     { "nativeGetRawAttributesFromAsset", "(J)Ljava/util/HashMap;",
       (void*)ExifInterface_getRawAttributesFromAsset },
     { "nativeGetRawAttributesFromFileDescriptor", "(Ljava/io/FileDescriptor;)Ljava/util/HashMap;",
       (void*)ExifInterface_getRawAttributesFromFileDescriptor },
     { "nativeGetRawAttributesFromInputStream", "(Ljava/io/InputStream;)Ljava/util/HashMap;",
       (void*)ExifInterface_getRawAttributesFromInputStream },
 };

 int register_android_media_ExifInterface(JNIEnv *env) {
     return AndroidRuntime::registerNativeMethods(
             env,
             "android/media/ExifInterface",
             gMethods,
             NELEM(gMethods));
 }
	/*
	* Copyright 2016 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.
	*/

	//#define LOG_NDEBUG 0
	#define LOG_TAG "ExifInterface_JNI"

	#include "android_media_Utils.h"

	#include "android/graphics/CreateJavaOutputStreamAdaptor.h"
	#include "src/piex_types.h"
	#include "src/piex.h"

	#include <jni.h>
	#include <JNIHelp.h>
	#include <androidfw/Asset.h>
	#include <android_runtime/AndroidRuntime.h>
	#include <android/graphics/Utils.h>
	#include <nativehelper/ScopedLocalRef.h>

	#include <utils/Log.h>
	#include <utils/String8.h>
	#include <utils/KeyedVector.h>

	// ----------------------------------------------------------------------------

	using namespace android;

	static const char kJpegSignatureChars[] = {(char)0xff, (char)0xd8, (char)0xff};
	static const int kJpegSignatureSize = 3;

	#define FIND_CLASS(var, className) \
	var = env->FindClass(className); \
	LOG_FATAL_IF(! var, "Unable to find class " className);

	#define GET_METHOD_ID(var, clazz, fieldName, fieldDescriptor) \
	var = env->GetMethodID(clazz, fieldName, fieldDescriptor); \
	LOG_FATAL_IF(! var, "Unable to find method " fieldName);

	struct HashMapFields {
	jmethodID init;
	jmethodID put;
	};

	struct fields_t {
	HashMapFields hashMap;
	jclass hashMapClassId;
	};

	static fields_t gFields;

	static jobject KeyedVectorToHashMap(JNIEnv *env, KeyedVector<String8, String8> const &map) {
	jclass clazz = gFields.hashMapClassId;
	jobject hashMap = env->NewObject(clazz, gFields.hashMap.init);
	for (size_t i = 0; i < map.size(); ++i) {
	jstring jkey = env->NewStringUTF(map.keyAt(i).string());
	jstring jvalue = env->NewStringUTF(map.valueAt(i).string());
	env->CallObjectMethod(hashMap, gFields.hashMap.put, jkey, jvalue);
	env->DeleteLocalRef(jkey);
	env->DeleteLocalRef(jvalue);
	}
	return hashMap;
	}

	extern "C" {

	// -------------------------- ExifInterface methods ---------------------------

	static void ExifInterface_initRaw(JNIEnv *env) {
	jclass clazz;
	FIND_CLASS(clazz, "java/util/HashMap");
	gFields.hashMapClassId = static_cast<jclass>(env->NewGlobalRef(clazz));

	GET_METHOD_ID(gFields.hashMap.init, clazz, "<init>", "()V");
	GET_METHOD_ID(gFields.hashMap.put, clazz, "put",
	"(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
	}

	static bool is_asset_stream(const SkStream& stream) {
	return stream.hasLength() && stream.hasPosition();
	}

	static jobject ExifInterface_getThumbnailFromAsset(
	JNIEnv* env, jclass /* clazz */, jlong jasset, jint jthumbnailOffset,
	jint jthumbnailLength) {
	Asset* asset = reinterpret_cast<Asset*>(jasset);
	std::unique_ptr<AssetStreamAdaptor> stream(new AssetStreamAdaptor(asset));

	std::unique_ptr<jbyte[]> thumbnailData(new jbyte[(int)jthumbnailLength]);
	if (thumbnailData.get() == NULL) {
	ALOGI("No memory to get thumbnail");
	return NULL;
	}

	// Do not know the current offset. So rewind it.
	stream->rewind();

	// Read thumbnail.
	stream->skip((int)jthumbnailOffset);
	stream->read((void*)thumbnailData.get(), (int)jthumbnailLength);

	// Copy to the byte array.
	jbyteArray byteArray = env->NewByteArray(jthumbnailLength);
	env->SetByteArrayRegion(byteArray, 0, jthumbnailLength, thumbnailData.get());
	return byteArray;
	}

	static jobject getRawAttributes(JNIEnv* env, SkStream* stream, bool returnThumbnail) {
	std::unique_ptr<SkStream> streamDeleter(stream);

	std::unique_ptr<::piex::StreamInterface> piexStream;
	if (is_asset_stream(*stream)) {
	piexStream.reset(new AssetStream(streamDeleter.release()));
	} else {
	piexStream.reset(new BufferedStream(streamDeleter.release()));
	}

	piex::PreviewImageData image_data;

	if (!GetExifFromRawImage(piexStream.get(), String8("[piex stream]"), image_data)) {
	ALOGI("Raw image not detected");
	return NULL;
	}

	KeyedVector<String8, String8> map;

	if (image_data.thumbnail.length > 0
	&& image_data.thumbnail.format == ::piex::Image::kJpegCompressed) {
	map.add(String8("HasThumbnail"), String8("true"));
	map.add(String8("ThumbnailOffset"), String8::format("%d", image_data.thumbnail.offset));
	map.add(String8("ThumbnailLength"), String8::format("%d", image_data.thumbnail.length));
	} else {
	map.add(String8("HasThumbnail"), String8("false"));
	}

	map.add(
	String8("Orientation"),
	String8::format("%u", image_data.exif_orientation));
	map.add(
	String8("ImageWidth"),
	String8::format("%u", image_data.full_width));
	map.add(
	String8("ImageLength"),
	String8::format("%u", image_data.full_height));

	// Current PIEX does not have LightSource information while JPEG version of
	// EXIFInterface always declares the light source field. For the
	// compatibility, it provides the default value of the light source field.
	map.add(String8("LightSource"), String8("0"));

	if (!image_data.maker.empty()) {
	map.add(String8("Make"), String8(image_data.maker.c_str()));
	}

	if (!image_data.model.empty()) {
	map.add(String8("Model"), String8(image_data.model.c_str()));
	}

	if (!image_data.date_time.empty()) {
	map.add(String8("DateTime"), String8(image_data.date_time.c_str()));
	}

	if (image_data.iso) {
	map.add(
	String8("ISOSpeedRatings"),
	String8::format("%u", image_data.iso));
	}

	if (image_data.exposure_time.numerator != 0
	&& image_data.exposure_time.denominator != 0) {
	double exposureTime =
	(double)image_data.exposure_time.numerator
	/ image_data.exposure_time.denominator;

	const char* format;
	if (exposureTime < 0.01) {
	format = "%6.4f";
	} else {
	format = "%5.3f";
	}
	map.add(String8("ExposureTime"), String8::format(format, exposureTime));
	}

	if (image_data.fnumber.numerator != 0
	&& image_data.fnumber.denominator != 0) {
	double fnumber =
	(double)image_data.fnumber.numerator
	/ image_data.fnumber.denominator;
	map.add(String8("FNumber"), String8::format("%5.3f", fnumber));
	}

	if (image_data.focal_length.numerator != 0
	&& image_data.focal_length.denominator != 0) {
	map.add(
	String8("FocalLength"),
	String8::format(
	"%u/%u",
	image_data.focal_length.numerator,
	image_data.focal_length.denominator));
	}

	if (image_data.gps.is_valid) {
	if (image_data.gps.latitude[0].denominator != 0
	&& image_data.gps.latitude[1].denominator != 0
	&& image_data.gps.latitude[2].denominator != 0) {
	map.add(
	String8("GPSLatitude"),
	String8::format(
	"%u/%u,%u/%u,%u/%u",
	image_data.gps.latitude[0].numerator,
	image_data.gps.latitude[0].denominator,
	image_data.gps.latitude[1].numerator,
	image_data.gps.latitude[1].denominator,
	image_data.gps.latitude[2].numerator,
	image_data.gps.latitude[2].denominator));
	}

	if (image_data.gps.latitude_ref) {
	char str[2];
	str[0] = image_data.gps.latitude_ref;
	str[1] = 0;
	map.add(String8("GPSLatitudeRef"), String8(str));
	}

	if (image_data.gps.longitude[0].denominator != 0
	&& image_data.gps.longitude[1].denominator != 0
	&& image_data.gps.longitude[2].denominator != 0) {
	map.add(
	String8("GPSLongitude"),
	String8::format(
	"%u/%u,%u/%u,%u/%u",
	image_data.gps.longitude[0].numerator,
	image_data.gps.longitude[0].denominator,
	image_data.gps.longitude[1].numerator,
	image_data.gps.longitude[1].denominator,
	image_data.gps.longitude[2].numerator,
	image_data.gps.longitude[2].denominator));
	}

	if (image_data.gps.longitude_ref) {
	char str[2];
	str[0] = image_data.gps.longitude_ref;
	str[1] = 0;
	map.add(String8("GPSLongitudeRef"), String8(str));
	}

	if (image_data.gps.altitude.denominator != 0) {
	map.add(
	String8("GPSAltitude"),
	String8::format("%u/%u",
	image_data.gps.altitude.numerator,
	image_data.gps.altitude.denominator));

	map.add(
	String8("GPSAltitudeRef"),
	String8(image_data.gps.altitude_ref ? "1" : "0"));
	}

	if (image_data.gps.time_stamp[0].denominator != 0
	&& image_data.gps.time_stamp[1].denominator != 0
	&& image_data.gps.time_stamp[2].denominator != 0) {
	map.add(
	String8("GPSTimeStamp"),
	String8::format(
	"%02u:%02u:%02u",
	image_data.gps.time_stamp[0].numerator
	/ image_data.gps.time_stamp[0].denominator,
	image_data.gps.time_stamp[1].numerator
	/ image_data.gps.time_stamp[1].denominator,
	image_data.gps.time_stamp[2].numerator
	/ image_data.gps.time_stamp[2].denominator));
	}

	if (!image_data.gps.date_stamp.empty()) {
	map.add(
	String8("GPSDateStamp"),
	String8(image_data.gps.date_stamp.c_str()));
	}
	}

	jobject hashMap = KeyedVectorToHashMap(env, map);

	if (returnThumbnail) {
	std::unique_ptr<jbyte[]> thumbnailData(new jbyte[image_data.thumbnail.length]);
	if (thumbnailData.get() == NULL) {
	ALOGE("No memory to parse a thumbnail");
	return NULL;
	}
	jbyteArray jthumbnailByteArray = env->NewByteArray(image_data.thumbnail.length);
	if (jthumbnailByteArray == NULL) {
	ALOGE("No memory to parse a thumbnail");
	return NULL;
	}
	piexStream.get()->GetData(image_data.thumbnail.offset, image_data.thumbnail.length,
	(uint8_t*)thumbnailData.get());
	env->SetByteArrayRegion(
	jthumbnailByteArray, 0, image_data.thumbnail.length, thumbnailData.get());
	jstring jkey = env->NewStringUTF(String8("ThumbnailData"));
	env->CallObjectMethod(hashMap, gFields.hashMap.put, jkey, jthumbnailByteArray);
	env->DeleteLocalRef(jkey);
	env->DeleteLocalRef(jthumbnailByteArray);
	}
	return hashMap;
	}

	static jobject ExifInterface_getRawAttributesFromAsset(
	JNIEnv* env, jclass /* clazz */, jlong jasset) {
	std::unique_ptr<char[]> jpegSignature(new char[kJpegSignatureSize]);
	if (jpegSignature.get() == NULL) {
	ALOGE("No enough memory to parse");
	return NULL;
	}

	Asset* asset = reinterpret_cast<Asset*>(jasset);
	std::unique_ptr<AssetStreamAdaptor> stream(new AssetStreamAdaptor(asset));

	if (stream.get()->read(jpegSignature.get(), kJpegSignatureSize) != kJpegSignatureSize) {
	// Rewind the stream.
	stream.get()->rewind();

	ALOGI("Corrupted image.");
	return NULL;
	}

	// Rewind the stream.
	stream.get()->rewind();

	if (memcmp(jpegSignature.get(), kJpegSignatureChars, kJpegSignatureSize) == 0) {
	ALOGI("Should be a JPEG stream.");
	return NULL;
	}

	// Try to parse from the given stream.
	jobject result = getRawAttributes(env, stream.get(), false);

	// Rewind the stream for the chance to read JPEG.
	if (result == NULL) {
	stream.get()->rewind();
	}
	return result;
	}

	static jobject ExifInterface_getRawAttributesFromFileDescriptor(
	JNIEnv* env, jclass /* clazz */, jobject jfileDescriptor) {
	std::unique_ptr<char[]> jpegSignature(new char[kJpegSignatureSize]);
	if (jpegSignature.get() == NULL) {
	ALOGE("No enough memory to parse");
	return NULL;
	}

	int fd = jniGetFDFromFileDescriptor(env, jfileDescriptor);
	if (fd < 0) {
	ALOGI("Invalid file descriptor");
	return NULL;
	}

	// Restore the file descriptor's offset on exiting this function.
	AutoFDSeek autoRestore(fd);

	int dupFd = dup(fd);

	FILE* file = fdopen(dupFd, "r");
	if (file == NULL) {
	ALOGI("Failed to open the file descriptor");
	return NULL;
	}

	if (fgets(jpegSignature.get(), kJpegSignatureSize, file) == NULL) {
	ALOGI("Corrupted image.");
	return NULL;
	}

	if (memcmp(jpegSignature.get(), kJpegSignatureChars, kJpegSignatureSize) == 0) {
	ALOGI("Should be a JPEG stream.");
	return NULL;
	}

	// Rewind the file descriptor.
	fseek(file, 0L, SEEK_SET);

	std::unique_ptr<SkFILEStream> fileStream(new SkFILEStream(file,
	SkFILEStream::kCallerPasses_Ownership));
	return getRawAttributes(env, fileStream.get(), false);
	}

	static jobject ExifInterface_getRawAttributesFromInputStream(
	JNIEnv* env, jclass /* clazz */, jobject jinputStream) {
	jbyteArray byteArray = env->NewByteArray(8*1024);
	ScopedLocalRef<jbyteArray> scoper(env, byteArray);
	std::unique_ptr<SkStream> stream(CreateJavaInputStreamAdaptor(env, jinputStream, scoper.get()));
	return getRawAttributes(env, stream.get(), true);
	}

	} // extern "C"

	// ----------------------------------------------------------------------------

	static JNINativeMethod gMethods[] = {
	{ "nativeInitRaw", "()V", (void *)ExifInterface_initRaw },
	{ "nativeGetThumbnailFromAsset", "(JII)[B", (void *)ExifInterface_getThumbnailFromAsset },
	{ "nativeGetRawAttributesFromAsset", "(J)Ljava/util/HashMap;",
	(void*)ExifInterface_getRawAttributesFromAsset },
	{ "nativeGetRawAttributesFromFileDescriptor", "(Ljava/io/FileDescriptor;)Ljava/util/HashMap;",
	(void*)ExifInterface_getRawAttributesFromFileDescriptor },
	{ "nativeGetRawAttributesFromInputStream", "(Ljava/io/InputStream;)Ljava/util/HashMap;",
	(void*)ExifInterface_getRawAttributesFromInputStream },
	};

	int register_android_media_ExifInterface(JNIEnv *env) {
	return AndroidRuntime::registerNativeMethods(
	env,
	"android/media/ExifInterface",
	gMethods,
	NELEM(gMethods));
	}