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Merge "add Base64InputStream"

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This commit is contained in:
Doug Zongker 2010-02-12 10:55:20 -08:00 committed by Android (Google) Code Review
commit 092198f554
2 changed files with 331 additions and 52 deletions
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169
common/java/com/android/common/Base64InputStream.java Normal file
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@ -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;
}
}

214
common/tests/src/com/android/common/Base64Test.java
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@ -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();
// 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 f = 0; f < flagses.length; ++f) {
int flags = flagses[f];
byte[] expected = Base64.encode(input, flags);
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);
}
}
}