add Base64InputStream (27a31e57) · Commits · e / os / android_frameworks_native-old

common/java/com/android/common/Base64InputStream.java

0 → 100644

+169 −0

Original line number	Diff line number	Diff line
		/*
		* 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;
		}
		}

common/tests/src/com/android/common/Base64Test.java

+163 −53

Original line number	Diff line number	Diff line
		@@ -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];

		@@ -272,23 +278,8 @@ public class Base64Test extends TestCase {
		assertEquals("YQ".getBytes(), 2, state.output, state.op);
		}

		/**
		* Tests that Base64OutputStream produces exactly the same results
		* as calling Base64.encode/.decode on an in-memory array.
		*/
		public void testOutputStream() 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);

		// 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. " +
		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. " +
		@@ -308,103 +299,222 @@ public class Base64Test extends TestCase {
		"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();
		"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);

		for (int f = 0; f < flagses.length; ++f) {
		int flags = flagses[f];
		// ----- test encoding ("plain" -> "encoded") -----

		byte[] expected = Base64.encode(input, flags);
		// 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.
		*/
		public void testOutputStream() 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 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);
		}
		}
		}