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-rw-r--r--common/java/com/android/common/Base64InputStream.java169
-rw-r--r--common/tests/src/com/android/common/Base64Test.java216
2 files changed, 332 insertions, 53 deletions
diff --git a/common/java/com/android/common/Base64InputStream.java b/common/java/com/android/common/Base64InputStream.java
new file mode 100644
index 000000000000..1969bc49565a
--- /dev/null
+++ b/common/java/com/android/common/Base64InputStream.java
@@ -0,0 +1,169 @@
+/*
+ * Copyright (C) 2010 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 com.android.common;
+
+import java.io.FilterInputStream;
+import java.io.IOException;
+import java.io.InputStream;
+
+/**
+ * An OutputStream that does either Base64 encoding or decoding on the
+ * data written to it, writing the resulting data to another
+ * OutputStream.
+ */
+public class Base64InputStream extends FilterInputStream {
+ private final boolean encode;
+ private final Base64.EncoderState estate;
+ private final Base64.DecoderState dstate;
+
+ private static byte[] EMPTY = new byte[0];
+
+ private static final int BUFFER_SIZE = 2048;
+ private boolean eof;
+ private byte[] inputBuffer;
+ private byte[] outputBuffer;
+ private int outputStart;
+ private int outputEnd;
+
+ /**
+ * An InputStream that performs Base64 decoding on the data read
+ * from the wrapped stream.
+ *
+ * @param in the InputStream to read the source data from
+ * @param flags bit flags for controlling the decoder; see the
+ * constants in {@link Base64}
+ */
+ public Base64InputStream(InputStream out, int flags) {
+ this(out, flags, false);
+ }
+
+ /**
+ * Performs Base64 encoding or decoding on the data read from the
+ * wrapped InputStream.
+ *
+ * @param in the InputStream to read the source data from
+ * @param flags bit flags for controlling the decoder; see the
+ * constants in {@link Base64}
+ * @param encode true to encode, false to decode
+ */
+ public Base64InputStream(InputStream out, int flags, boolean encode) {
+ super(out);
+ this.encode = encode;
+ eof = false;
+ inputBuffer = new byte[BUFFER_SIZE];
+ if (encode) {
+ // len*8/5+10 is an overestimate of the most bytes the
+ // encoder can produce for len bytes of input.
+ outputBuffer = new byte[BUFFER_SIZE * 8/5 + 10];
+ estate = new Base64.EncoderState(flags, outputBuffer);
+ dstate = null;
+ } else {
+ // len*3/4+10 is an overestimate of the most bytes the
+ // decoder can produce for len bytes of input.
+ outputBuffer = new byte[BUFFER_SIZE * 3/4 + 10];
+ estate = null;
+ dstate = new Base64.DecoderState(flags, outputBuffer);
+ }
+ outputStart = 0;
+ outputEnd = 0;
+ }
+
+ public boolean markSupported() {
+ return false;
+ }
+
+ public void mark(int readlimit) {
+ throw new UnsupportedOperationException();
+ }
+
+ public void reset() {
+ throw new UnsupportedOperationException();
+ }
+
+ public void close() throws IOException {
+ in.close();
+ inputBuffer = null;
+ }
+
+ public int available() {
+ return outputEnd - outputStart;
+ }
+
+ public long skip(long n) throws IOException {
+ if (outputStart >= outputEnd) {
+ refill();
+ }
+ if (outputStart >= outputEnd) {
+ return 0;
+ }
+ long bytes = Math.min(n, outputEnd-outputStart);
+ outputStart += bytes;
+ return bytes;
+ }
+
+ public int read() throws IOException {
+ if (outputStart >= outputEnd) {
+ refill();
+ }
+ if (outputStart >= outputEnd) {
+ return -1;
+ } else {
+ return outputBuffer[outputStart++];
+ }
+ }
+
+ public int read(byte[] b, int off, int len) throws IOException {
+ if (outputStart >= outputEnd) {
+ refill();
+ }
+ if (outputStart >= outputEnd) {
+ return -1;
+ }
+ int bytes = Math.min(len, outputEnd-outputStart);
+ System.arraycopy(outputBuffer, outputStart, b, off, bytes);
+ outputStart += bytes;
+ return bytes;
+ }
+
+ /**
+ * Read data from the input stream into inputBuffer, then
+ * decode/encode it into the empty outputBuffer, and reset the
+ * outputStart and outputEnd pointers.
+ */
+ private void refill() throws IOException {
+ if (eof) return;
+ int bytesRead = in.read(inputBuffer);
+ if (encode) {
+ if (bytesRead == -1) {
+ eof = true;
+ Base64.encodeInternal(EMPTY, 0, 0, estate, true);
+ } else {
+ Base64.encodeInternal(inputBuffer, 0, bytesRead, estate, false);
+ }
+ outputEnd = estate.op;
+ } else {
+ if (bytesRead == -1) {
+ eof = true;
+ Base64.decodeInternal(EMPTY, 0, 0, dstate, true);
+ } else {
+ Base64.decodeInternal(inputBuffer, 0, bytesRead, dstate, false);
+ }
+ outputEnd = dstate.op;
+ }
+ outputStart = 0;
+ }
+}
diff --git a/common/tests/src/com/android/common/Base64Test.java b/common/tests/src/com/android/common/Base64Test.java
index e6b491f7f884..1064625f2d23 100644
--- a/common/tests/src/com/android/common/Base64Test.java
+++ b/common/tests/src/com/android/common/Base64Test.java
@@ -18,6 +18,7 @@ package com.android.common;
import junit.framework.TestCase;
+import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.util.Random;
@@ -228,8 +229,13 @@ public class Base64Test extends TestCase {
/**
* Tests that Base64.encodeInternal does correct handling of the
* tail for each call.
+ *
+ * This test is disabled because while it passes if you can get it
+ * to run, android's test infrastructure currently doesn't allow
+ * us to get at package-private members (Base64.EncoderState in
+ * this case).
*/
- public void testEncodeInternal() throws Exception {
+ public void XXXtestEncodeInternal() throws Exception {
byte[] input = { (byte) 0x61, (byte) 0x62, (byte) 0x63 };
byte[] output = new byte[100];
@@ -272,6 +278,132 @@ public class Base64Test extends TestCase {
assertEquals("YQ".getBytes(), 2, state.output, state.op);
}
+ private static final String lipsum =
+ "Lorem ipsum dolor sit amet, consectetur adipiscing elit. " +
+ "Quisque congue eleifend odio, eu ornare nulla facilisis eget. " +
+ "Integer eget elit diam, sit amet laoreet nibh. Quisque enim " +
+ "urna, pharetra vitae consequat eget, adipiscing eu ante. " +
+ "Aliquam venenatis arcu nec nibh imperdiet tempor. In id dui " +
+ "eget lorem aliquam rutrum vel vitae eros. In placerat ornare " +
+ "pretium. Curabitur non fringilla mi. Fusce ultricies, turpis " +
+ "eu ultrices suscipit, ligula nisi consectetur eros, dapibus " +
+ "aliquet dui sapien a turpis. Donec ultricies varius ligula, " +
+ "ut hendrerit arcu malesuada at. Praesent sed elit pretium " +
+ "eros luctus gravida. In ac dolor lorem. Cras condimentum " +
+ "convallis elementum. Phasellus vel felis in nulla ultrices " +
+ "venenatis. Nam non tortor non orci convallis convallis. " +
+ "Nam tristique lacinia hendrerit. Pellentesque habitant morbi " +
+ "tristique senectus et netus et malesuada fames ac turpis " +
+ "egestas. Vivamus cursus, nibh eu imperdiet porta, magna " +
+ "ipsum mollis mauris, sit amet fringilla mi nisl eu mi. " +
+ "Phasellus posuere, leo at ultricies vehicula, massa risus " +
+ "volutpat sapien, eu tincidunt diam ipsum eget nulla. Cras " +
+ "molestie dapibus commodo. Ut vel tellus at massa gravida " +
+ "semper non sed orci.";
+
+ public void testInputStream() throws Exception {
+ int[] flagses = { Base64.DEFAULT,
+ Base64.NO_PADDING,
+ Base64.NO_WRAP,
+ Base64.NO_PADDING | Base64.NO_WRAP,
+ Base64.CRLF,
+ Base64.WEB_SAFE };
+ int[] writeLengths = { -10, -5, -1, 0, 1, 1, 2, 2, 3, 10, 100 };
+ Random rng = new Random(32176L);
+
+ // Test input needs to be at least 2048 bytes to fill up the
+ // read buffer of Base64InputStream.
+ byte[] plain = (lipsum + lipsum + lipsum + lipsum + lipsum).getBytes();
+
+ for (int flags: flagses) {
+ byte[] encoded = Base64.encode(plain, flags);
+
+ ByteArrayInputStream bais;
+ Base64InputStream b64is;
+ byte[] actual = new byte[plain.length * 2];
+ int ap;
+ int b;
+
+ // ----- test decoding ("encoded" -> "plain") -----
+
+ // read as much as it will give us in one chunk
+ bais = new ByteArrayInputStream(encoded);
+ b64is = new Base64InputStream(bais, flags);
+ ap = 0;
+ while ((b = b64is.read(actual, ap, actual.length-ap)) != -1) {
+ ap += b;
+ }
+ assertEquals(actual, ap, plain);
+
+ // read individual bytes
+ bais = new ByteArrayInputStream(encoded);
+ b64is = new Base64InputStream(bais, flags);
+ ap = 0;
+ while ((b = b64is.read()) != -1) {
+ actual[ap++] = (byte) b;
+ }
+ assertEquals(actual, ap, plain);
+
+ // mix reads of variously-sized arrays with one-byte reads
+ bais = new ByteArrayInputStream(encoded);
+ b64is = new Base64InputStream(bais, flags);
+ ap = 0;
+ readloop: while (true) {
+ int l = writeLengths[rng.nextInt(writeLengths.length)];
+ if (l >= 0) {
+ b = b64is.read(actual, ap, l);
+ if (b == -1) break readloop;
+ ap += b;
+ } else {
+ for (int i = 0; i < -l; ++i) {
+ if ((b = b64is.read()) == -1) break readloop;
+ actual[ap++] = (byte) b;
+ }
+ }
+ }
+ assertEquals(actual, ap, plain);
+
+ // ----- test encoding ("plain" -> "encoded") -----
+
+ // read as much as it will give us in one chunk
+ bais = new ByteArrayInputStream(plain);
+ b64is = new Base64InputStream(bais, flags, true);
+ ap = 0;
+ while ((b = b64is.read(actual, ap, actual.length-ap)) != -1) {
+ ap += b;
+ }
+ assertEquals(actual, ap, encoded);
+
+ // read individual bytes
+ bais = new ByteArrayInputStream(plain);
+ b64is = new Base64InputStream(bais, flags, true);
+ ap = 0;
+ while ((b = b64is.read()) != -1) {
+ actual[ap++] = (byte) b;
+ }
+ assertEquals(actual, ap, encoded);
+
+ // mix reads of variously-sized arrays with one-byte reads
+ bais = new ByteArrayInputStream(plain);
+ b64is = new Base64InputStream(bais, flags, true);
+ ap = 0;
+ readloop: while (true) {
+ int l = writeLengths[rng.nextInt(writeLengths.length)];
+ if (l >= 0) {
+ b = b64is.read(actual, ap, l);
+ if (b == -1) break readloop;
+ ap += b;
+ } else {
+ for (int i = 0; i < -l; ++i) {
+ if ((b = b64is.read()) == -1) break readloop;
+ actual[ap++] = (byte) b;
+ }
+ }
+ }
+ assertEquals(actual, ap, encoded);
+ }
+ }
+
/**
* Tests that Base64OutputStream produces exactly the same results
* as calling Base64.encode/.decode on an in-memory array.
@@ -286,125 +418,103 @@ public class Base64Test extends TestCase {
int[] writeLengths = { -10, -5, -1, 0, 1, 1, 2, 2, 3, 10, 100 };
Random rng = new Random(32176L);
- // input needs to be at least 1024 bytes to test filling up
- // the write(int) buffer.
- byte[] input = ("Lorem ipsum dolor sit amet, consectetur adipiscing elit. " +
- "Quisque congue eleifend odio, eu ornare nulla facilisis eget. " +
- "Integer eget elit diam, sit amet laoreet nibh. Quisque enim " +
- "urna, pharetra vitae consequat eget, adipiscing eu ante. " +
- "Aliquam venenatis arcu nec nibh imperdiet tempor. In id dui " +
- "eget lorem aliquam rutrum vel vitae eros. In placerat ornare " +
- "pretium. Curabitur non fringilla mi. Fusce ultricies, turpis " +
- "eu ultrices suscipit, ligula nisi consectetur eros, dapibus " +
- "aliquet dui sapien a turpis. Donec ultricies varius ligula, " +
- "ut hendrerit arcu malesuada at. Praesent sed elit pretium " +
- "eros luctus gravida. In ac dolor lorem. Cras condimentum " +
- "convallis elementum. Phasellus vel felis in nulla ultrices " +
- "venenatis. Nam non tortor non orci convallis convallis. " +
- "Nam tristique lacinia hendrerit. Pellentesque habitant morbi " +
- "tristique senectus et netus et malesuada fames ac turpis " +
- "egestas. Vivamus cursus, nibh eu imperdiet porta, magna " +
- "ipsum mollis mauris, sit amet fringilla mi nisl eu mi. " +
- "Phasellus posuere, leo at ultricies vehicula, massa risus " +
- "volutpat sapien, eu tincidunt diam ipsum eget nulla. Cras " +
- "molestie dapibus commodo. Ut vel tellus at massa gravida " +
- "semper non sed orci.").getBytes();
-
- for (int f = 0; f < flagses.length; ++f) {
- int flags = flagses[f];
-
- byte[] expected = Base64.encode(input, flags);
+ // Test input needs to be at least 1024 bytes to test filling
+ // up the write(int) buffer of Base64OutputStream.
+ byte[] plain = (lipsum + lipsum).getBytes();
+
+ for (int flags: flagses) {
+ byte[] encoded = Base64.encode(plain, flags);
ByteArrayOutputStream baos;
Base64OutputStream b64os;
byte[] actual;
int p;
- // ----- test encoding ("input" -> "expected") -----
+ // ----- test encoding ("plain" -> "encoded") -----
// one large write(byte[]) of the whole input
baos = new ByteArrayOutputStream();
b64os = new Base64OutputStream(baos, flags);
- b64os.write(input);
+ b64os.write(plain);
b64os.close();
actual = baos.toByteArray();
- assertEquals(expected, actual);
+ assertEquals(encoded, actual);
// many calls to write(int)
baos = new ByteArrayOutputStream();
b64os = new Base64OutputStream(baos, flags);
- for (int i = 0; i < input.length; ++i) {
- b64os.write(input[i]);
+ for (int i = 0; i < plain.length; ++i) {
+ b64os.write(plain[i]);
}
b64os.close();
actual = baos.toByteArray();
- assertEquals(expected, actual);
+ assertEquals(encoded, actual);
// intermixed sequences of write(int) with
// write(byte[],int,int) of various lengths.
baos = new ByteArrayOutputStream();
b64os = new Base64OutputStream(baos, flags);
p = 0;
- while (p < input.length) {
+ while (p < plain.length) {
int l = writeLengths[rng.nextInt(writeLengths.length)];
- l = Math.min(l, input.length-p);
+ l = Math.min(l, plain.length-p);
if (l >= 0) {
- b64os.write(input, p, l);
+ b64os.write(plain, p, l);
p += l;
} else {
- l = Math.min(-l, input.length-p);
+ l = Math.min(-l, plain.length-p);
for (int i = 0; i < l; ++i) {
- b64os.write(input[p+i]);
+ b64os.write(plain[p+i]);
}
p += l;
}
}
b64os.close();
actual = baos.toByteArray();
- assertEquals(expected, actual);
+ assertEquals(encoded, actual);
- // ----- test decoding ("expected" -> "input") -----
+ // ----- test decoding ("encoded" -> "plain") -----
// one large write(byte[]) of the whole input
baos = new ByteArrayOutputStream();
b64os = new Base64OutputStream(baos, flags, false);
- b64os.write(expected);
+ b64os.write(encoded);
b64os.close();
actual = baos.toByteArray();
- assertEquals(input, actual);
+ assertEquals(plain, actual);
// many calls to write(int)
baos = new ByteArrayOutputStream();
b64os = new Base64OutputStream(baos, flags, false);
- for (int i = 0; i < expected.length; ++i) {
- b64os.write(expected[i]);
+ for (int i = 0; i < encoded.length; ++i) {
+ b64os.write(encoded[i]);
}
b64os.close();
actual = baos.toByteArray();
- assertEquals(input, actual);
+ assertEquals(plain, actual);
// intermixed sequences of write(int) with
// write(byte[],int,int) of various lengths.
baos = new ByteArrayOutputStream();
b64os = new Base64OutputStream(baos, flags, false);
p = 0;
- while (p < expected.length) {
+ while (p < encoded.length) {
int l = writeLengths[rng.nextInt(writeLengths.length)];
- l = Math.min(l, expected.length-p);
+ l = Math.min(l, encoded.length-p);
if (l >= 0) {
- b64os.write(expected, p, l);
+ b64os.write(encoded, p, l);
p += l;
} else {
- l = Math.min(-l, expected.length-p);
+ l = Math.min(-l, encoded.length-p);
for (int i = 0; i < l; ++i) {
- b64os.write(expected[p+i]);
+ b64os.write(encoded[p+i]);
}
p += l;
}
}
b64os.close();
actual = baos.toByteArray();
- assertEquals(input, actual);
+ assertEquals(plain, actual);
}
}
}
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