// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// http://code.google.com/p/protobuf/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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package com.google.protobuf;
import com.google.protobuf.ByteString.Output;
import junit.framework.TestCase;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Iterator;
import java.util.List;
import java.util.NoSuchElementException;
import java.util.Random;
/**
* Test methods with implementations in {@link ByteString}, plus do some top-level "integration"
* tests.
*
* @author carlanton@google.com (Carl Haverl)
*/
public class ByteStringTest extends TestCase {
private static final String UTF_16 = "UTF-16";
static byte[] getTestBytes(int size, long seed) {
Random random = new Random(seed);
byte[] result = new byte[size];
random.nextBytes(result);
return result;
}
private byte[] getTestBytes(int size) {
return getTestBytes(size, 445566L);
}
private byte[] getTestBytes() {
return getTestBytes(1000);
}
// Compare the entire left array with a subset of the right array.
private boolean isArrayRange(byte[] left, byte[] right, int rightOffset, int length) {
boolean stillEqual = (left.length == length);
for (int i = 0; (stillEqual && i < length); ++i) {
stillEqual = (left[i] == right[rightOffset + i]);
}
return stillEqual;
}
// Returns true only if the given two arrays have identical contents.
private boolean isArray(byte[] left, byte[] right) {
return left.length == right.length && isArrayRange(left, right, 0, left.length);
}
public void testSubstring_BeginIndex() {
byte[] bytes = getTestBytes();
ByteString substring = ByteString.copyFrom(bytes).substring(500);
assertTrue("substring must contain the tail of the string",
isArrayRange(substring.toByteArray(), bytes, 500, bytes.length - 500));
}
public void testCopyFrom_BytesOffsetSize() {
byte[] bytes = getTestBytes();
ByteString byteString = ByteString.copyFrom(bytes, 500, 200);
assertTrue("copyFrom sub-range must contain the expected bytes",
isArrayRange(byteString.toByteArray(), bytes, 500, 200));
}
public void testCopyFrom_Bytes() {
byte[] bytes = getTestBytes();
ByteString byteString = ByteString.copyFrom(bytes);
assertTrue("copyFrom must contain the expected bytes",
isArray(byteString.toByteArray(), bytes));
}
public void testCopyFrom_ByteBufferSize() {
byte[] bytes = getTestBytes();
ByteBuffer byteBuffer = ByteBuffer.allocate(bytes.length);
byteBuffer.put(bytes);
byteBuffer.position(500);
ByteString byteString = ByteString.copyFrom(byteBuffer, 200);
assertTrue("copyFrom byteBuffer sub-range must contain the expected bytes",
isArrayRange(byteString.toByteArray(), bytes, 500, 200));
}
public void testCopyFrom_ByteBuffer() {
byte[] bytes = getTestBytes();
ByteBuffer byteBuffer = ByteBuffer.allocate(bytes.length);
byteBuffer.put(bytes);
byteBuffer.position(500);
ByteString byteString = ByteString.copyFrom(byteBuffer);
assertTrue("copyFrom byteBuffer sub-range must contain the expected bytes",
isArrayRange(byteString.toByteArray(), bytes, 500, bytes.length - 500));
}
public void testCopyFrom_StringEncoding() throws UnsupportedEncodingException {
String testString = "I love unicode \u1234\u5678 characters";
ByteString byteString = ByteString.copyFrom(testString, UTF_16);
byte[] testBytes = testString.getBytes(UTF_16);
assertTrue("copyFrom string must respect the charset",
isArrayRange(byteString.toByteArray(), testBytes, 0, testBytes.length));
}
public void testCopyFrom_Utf8() throws UnsupportedEncodingException {
String testString = "I love unicode \u1234\u5678 characters";
ByteString byteString = ByteString.copyFromUtf8(testString);
byte[] testBytes = testString.getBytes("UTF-8");
assertTrue("copyFromUtf8 string must respect the charset",
isArrayRange(byteString.toByteArray(), testBytes, 0, testBytes.length));
}
public void testCopyFrom_Iterable() {
byte[] testBytes = getTestBytes(77777, 113344L);
final List<ByteString> pieces = makeConcretePieces(testBytes);
// Call copyFrom() on a Collection
ByteString byteString = ByteString.copyFrom(pieces);
assertTrue("copyFrom a List must contain the expected bytes",
isArrayRange(byteString.toByteArray(), testBytes, 0, testBytes.length));
// Call copyFrom on an iteration that's not a collection
ByteString byteStringAlt = ByteString.copyFrom(new Iterable<ByteString>() {
public Iterator<ByteString> iterator() {
return pieces.iterator();
}
});
assertEquals("copyFrom from an Iteration must contain the expected bytes",
byteString, byteStringAlt);
}
public void testCopyTo_TargetOffset() {
byte[] bytes = getTestBytes();
ByteString byteString = ByteString.copyFrom(bytes);
byte[] target = new byte[bytes.length + 1000];
byteString.copyTo(target, 400);
assertTrue("copyFrom byteBuffer sub-range must contain the expected bytes",
isArrayRange(bytes, target, 400, bytes.length));
}
public void testReadFrom_emptyStream() throws IOException {
ByteString byteString =
ByteString.readFrom(new ByteArrayInputStream(new byte[0]));
assertSame("reading an empty stream must result in the EMPTY constant "
+ "byte string", ByteString.EMPTY, byteString);
}
public void testReadFrom_smallStream() throws IOException {
assertReadFrom(getTestBytes(10));
}
public void testReadFrom_mutating() throws IOException {
byte[] capturedArray = null;
EvilInputStream eis = new EvilInputStream();
ByteString byteString = ByteString.readFrom(eis);
capturedArray = eis.capturedArray;
byte[] originalValue = byteString.toByteArray();
for (int x = 0; x < capturedArray.length; ++x) {
capturedArray[x] = (byte) 0;
}
byte[] newValue = byteString.toByteArray();
assertTrue("copyFrom byteBuffer must not grant access to underlying array",
Arrays.equals(originalValue, newValue));
}
// Tests sizes that are near the rope copy-out threshold.
public void testReadFrom_mediumStream() throws IOException {
assertReadFrom(getTestBytes(ByteString.CONCATENATE_BY_COPY_SIZE - 1));
assertReadFrom(getTestBytes(ByteString.CONCATENATE_BY_COPY_SIZE));
assertReadFrom(getTestBytes(ByteString.CONCATENATE_BY_COPY_SIZE + 1));
assertReadFrom(getTestBytes(200));
}
// Tests sizes that are over multi-segment rope threshold.
public void testReadFrom_largeStream() throws IOException {
assertReadFrom(getTestBytes(0x100));
assertReadFrom(getTestBytes(0x101));
assertReadFrom(getTestBytes(0x110));
assertReadFrom(getTestBytes(0x1000));
assertReadFrom(getTestBytes(0x1001));
assertReadFrom(getTestBytes(0x1010));
assertReadFrom(getTestBytes(0x10000));
assertReadFrom(getTestBytes(0x10001));
assertReadFrom(getTestBytes(0x10010));
}
// Tests sizes that are near the read buffer size.
public void testReadFrom_byteBoundaries() throws IOException {
final int min = ByteString.MIN_READ_FROM_CHUNK_SIZE;
final int max = ByteString.MAX_READ_FROM_CHUNK_SIZE;
assertReadFrom(getTestBytes(min - 1));
assertReadFrom(getTestBytes(min));
assertReadFrom(getTestBytes(min + 1));
assertReadFrom(getTestBytes(min * 2 - 1));
assertReadFrom(getTestBytes(min * 2));
assertReadFrom(getTestBytes(min * 2 + 1));
assertReadFrom(getTestBytes(min * 4 - 1));
assertReadFrom(getTestBytes(min * 4));
assertReadFrom(getTestBytes(min * 4 + 1));
assertReadFrom(getTestBytes(min * 8 - 1));
assertReadFrom(getTestBytes(min * 8));
assertReadFrom(getTestBytes(min * 8 + 1));
assertReadFrom(getTestBytes(max - 1));
assertReadFrom(getTestBytes(max));
assertReadFrom(getTestBytes(max + 1));
assertReadFrom(getTestBytes(max * 2 - 1));
assertReadFrom(getTestBytes(max * 2));
assertReadFrom(getTestBytes(max * 2 + 1));
}
// Tests that IOExceptions propagate through ByteString.readFrom().
public void testReadFrom_IOExceptions() {
try {
ByteString.readFrom(new FailStream());
fail("readFrom must throw the underlying IOException");
} catch (IOException e) {
assertEquals("readFrom must throw the expected exception",
"synthetic failure", e.getMessage());
}
}
// Tests that ByteString.readFrom works with streams that don't
// always fill their buffers.
public void testReadFrom_reluctantStream() throws IOException {
final byte[] data = getTestBytes(0x1000);
ByteString byteString = ByteString.readFrom(new ReluctantStream(data));
assertTrue("readFrom byte stream must contain the expected bytes",
isArray(byteString.toByteArray(), data));
// Same test as above, but with some specific chunk sizes.
assertReadFromReluctantStream(data, 100);
assertReadFromReluctantStream(data, 248);
assertReadFromReluctantStream(data, 249);
assertReadFromReluctantStream(data, 250);
assertReadFromReluctantStream(data, 251);
assertReadFromReluctantStream(data, 0x1000);
assertReadFromReluctantStream(data, 0x1001);
}
// Fails unless ByteString.readFrom reads the bytes correctly from a
// reluctant stream with the given chunkSize parameter.
private void assertReadFromReluctantStream(byte[] bytes, int chunkSize)
throws IOException {
ByteString b = ByteString.readFrom(new ReluctantStream(bytes), chunkSize);
assertTrue("readFrom byte stream must contain the expected bytes",
isArray(b.toByteArray(), bytes));
}
// Tests that ByteString.readFrom works with streams that implement
// available().
public void testReadFrom_available() throws IOException {
final byte[] data = getTestBytes(0x1001);
ByteString byteString = ByteString.readFrom(new AvailableStream(data));
assertTrue("readFrom byte stream must contain the expected bytes",
isArray(byteString.toByteArray(), data));
}
// Fails unless ByteString.readFrom reads the bytes correctly.
private void assertReadFrom(byte[] bytes) throws IOException {
ByteString byteString =
ByteString.readFrom(new ByteArrayInputStream(bytes));
assertTrue("readFrom byte stream must contain the expected bytes",
isArray(byteString.toByteArray(), bytes));
}
// A stream that fails when read.
private static final class FailStream extends InputStream {
@Override public int read() throws IOException {
throw new IOException("synthetic failure");
}
}
// A stream that simulates blocking by only producing 250 characters
// per call to read(byte[]).
private static class ReluctantStream extends InputStream {
protected final byte[] data;
protected int pos = 0;
public ReluctantStream(byte[] data) {
this.data = data;
}
@Override public int read() {
if (pos == data.length) {
return -1;
} else {
return data[pos++];
}
}
@Override public int read(byte[] buf) {
return read(buf, 0, buf.length);
}
@Override public int read(byte[] buf, int offset, int size) {
if (pos == data.length) {
return -1;
}
int count = Math.min(Math.min(size, data.length - pos), 250);
System.arraycopy(data, pos, buf, offset, count);
pos += count;
return count;
}
}
// Same as above, but also implements available().
private static final class AvailableStream extends ReluctantStream {
public AvailableStream(byte[] data) {
super(data);
}
@Override public int available() {
return Math.min(250, data.length - pos);
}
}
// A stream which exposes the byte array passed into read(byte[], int, int).
private static class EvilInputStream extends InputStream {
public byte[] capturedArray = null;
@Override
public int read(byte[] buf, int off, int len) {
if (capturedArray != null) {
return -1;
} else {
capturedArray = buf;
for (int x = 0; x < len; ++x) {
buf[x] = (byte) x;
}
return len;
}
}
@Override
public int read() {
// Purposefully do nothing.
return -1;
}
}
// A stream which exposes the byte array passed into write(byte[], int, int).
private static class EvilOutputStream extends OutputStream {
public byte[] capturedArray = null;
@Override
public void write(byte[] buf, int off, int len) {
if (capturedArray == null) {
capturedArray = buf;
}
}
@Override
public void write(int ignored) {
// Purposefully do nothing.
}
}
public void testToStringUtf8() throws UnsupportedEncodingException {
String testString = "I love unicode \u1234\u5678 characters";
byte[] testBytes = testString.getBytes("UTF-8");
ByteString byteString = ByteString.copyFrom(testBytes);
assertEquals("copyToStringUtf8 must respect the charset",
testString, byteString.toStringUtf8());
}
public void testNewOutput_InitialCapacity() throws IOException {
byte[] bytes = getTestBytes();
ByteString.Output output = ByteString.newOutput(bytes.length + 100);
output.write(bytes);
ByteString byteString = output.toByteString();
assertTrue(
"String built from newOutput(int) must contain the expected bytes",
isArrayRange(bytes, byteString.toByteArray(), 0, bytes.length));
}
// Test newOutput() using a variety of buffer sizes and a variety of (fixed)
// write sizes
public void testNewOutput_ArrayWrite() throws IOException {
byte[] bytes = getTestBytes();
int length = bytes.length;
int[] bufferSizes = {128, 256, length / 2, length - 1, length, length + 1,
2 * length, 3 * length};
int[] writeSizes = {1, 4, 5, 7, 23, bytes.length};
for (int bufferSize : bufferSizes) {
for (int writeSize : writeSizes) {
// Test writing the entire output writeSize bytes at a time.
ByteString.Output output = ByteString.newOutput(bufferSize);
for (int i = 0; i < length; i += writeSize) {
output.write(bytes, i, Math.min(writeSize, length - i));
}
ByteString byteString = output.toByteString();
assertTrue("String built from newOutput() must contain the expected bytes",
isArrayRange(bytes, byteString.toByteArray(), 0, bytes.length));
}
}
}
// Test newOutput() using a variety of buffer sizes, but writing all the
// characters using write(byte);
public void testNewOutput_WriteChar() throws IOException {
byte[] bytes = getTestBytes();
int length = bytes.length;
int[] bufferSizes = {0, 1, 128, 256, length / 2,
length - 1, length, length + 1,
2 * length, 3 * length};
for (int bufferSize : bufferSizes) {
ByteString.Output output = ByteString.newOutput(bufferSize);
for (byte byteValue : bytes) {
output.write(byteValue);
}
ByteString byteString = output.toByteString();
assertTrue("String built from newOutput() must contain the expected bytes",
isArrayRange(bytes, byteString.toByteArray(), 0, bytes.length));
}
}
// Test newOutput() in which we write the bytes using a variety of methods
// and sizes, and in which we repeatedly call toByteString() in the middle.
public void testNewOutput_Mixed() throws IOException {
Random rng = new Random(1);
byte[] bytes = getTestBytes();
int length = bytes.length;
int[] bufferSizes = {0, 1, 128, 256, length / 2,
length - 1, length, length + 1,
2 * length, 3 * length};
for (int bufferSize : bufferSizes) {
// Test writing the entire output using a mixture of write sizes and
// methods;
ByteString.Output output = ByteString.newOutput(bufferSize);
int position = 0;
while (position < bytes.length) {
if (rng.nextBoolean()) {
int count = 1 + rng.nextInt(bytes.length - position);
output.write(bytes, position, count);
position += count;
} else {
output.write(bytes[position]);
position++;
}
assertEquals("size() returns the right value", position, output.size());
assertTrue("newOutput() substring must have correct bytes",
isArrayRange(output.toByteString().toByteArray(),
bytes, 0, position));
}
ByteString byteString = output.toByteString();
assertTrue("String built from newOutput() must contain the expected bytes",
isArrayRange(bytes, byteString.toByteArray(), 0, bytes.length));
}
}
public void testNewOutputEmpty() throws IOException {
// Make sure newOutput() correctly builds empty byte strings
ByteString byteString = ByteString.newOutput().toByteString();
assertEquals(ByteString.EMPTY, byteString);
}
public void testNewOutput_Mutating() throws IOException {
Output os = ByteString.newOutput(5);
os.write(new byte[] {1, 2, 3, 4, 5});
EvilOutputStream eos = new EvilOutputStream();
os.writeTo(eos);
byte[] capturedArray = eos.capturedArray;
ByteString byteString = os.toByteString();
byte[] oldValue = byteString.toByteArray();
Arrays.fill(capturedArray, (byte) 0);
byte[] newValue = byteString.toByteArray();
assertTrue("Output must not provide access to the underlying byte array",
Arrays.equals(oldValue, newValue));
}
public void testNewCodedBuilder() throws IOException {
byte[] bytes = getTestBytes();
ByteString.CodedBuilder builder = ByteString.newCodedBuilder(bytes.length);
builder.getCodedOutput().writeRawBytes(bytes);
ByteString byteString = builder.build();
assertTrue("String built from newCodedBuilder() must contain the expected bytes",
isArrayRange(bytes, byteString.toByteArray(), 0, bytes.length));
}
public void testSubstringParity() {
byte[] bigBytes = getTestBytes(2048 * 1024, 113344L);
int start = 512 * 1024 - 3333;
int end = 512 * 1024 + 7777;
ByteString concreteSubstring = ByteString.copyFrom(bigBytes).substring(start, end);
boolean ok = true;
for (int i = start; ok && i < end; ++i) {
ok = (bigBytes[i] == concreteSubstring.byteAt(i - start));
}
assertTrue("Concrete substring didn't capture the right bytes", ok);
ByteString literalString = ByteString.copyFrom(bigBytes, start, end - start);
assertTrue("Substring must be equal to literal string",
concreteSubstring.equals(literalString));
assertEquals("Substring must have same hashcode as literal string",
literalString.hashCode(), concreteSubstring.hashCode());
}
public void testCompositeSubstring() {
byte[] referenceBytes = getTestBytes(77748, 113344L);
List<ByteString> pieces = makeConcretePieces(referenceBytes);
ByteString listString = ByteString.copyFrom(pieces);
int from = 1000;
int to = 40000;
ByteString compositeSubstring = listString.substring(from, to);
byte[] substringBytes = compositeSubstring.toByteArray();
boolean stillEqual = true;
for (int i = 0; stillEqual && i < to - from; ++i) {
stillEqual = referenceBytes[from + i] == substringBytes[i];
}
assertTrue("Substring must return correct bytes", stillEqual);
stillEqual = true;
for (int i = 0; stillEqual && i < to - from; ++i) {
stillEqual = referenceBytes[from + i] == compositeSubstring.byteAt(i);
}
assertTrue("Substring must support byteAt() correctly", stillEqual);
ByteString literalSubstring = ByteString.copyFrom(referenceBytes, from, to - from);
assertTrue("Composite substring must equal a literal substring over the same bytes",
compositeSubstring.equals(literalSubstring));
assertTrue("Literal substring must equal a composite substring over the same bytes",
literalSubstring.equals(compositeSubstring));
assertEquals("We must get the same hashcodes for composite and literal substrings",
literalSubstring.hashCode(), compositeSubstring.hashCode());
assertFalse("We can't be equal to a proper substring",
compositeSubstring.equals(literalSubstring.substring(0, literalSubstring.size() - 1)));
}
public void testCopyFromList() {
byte[] referenceBytes = getTestBytes(77748, 113344L);
ByteString literalString = ByteString.copyFrom(referenceBytes);
List<ByteString> pieces = makeConcretePieces(referenceBytes);
ByteString listString = ByteString.copyFrom(pieces);
assertTrue("Composite string must be equal to literal string",
listString.equals(literalString));
assertEquals("Composite string must have same hashcode as literal string",
literalString.hashCode(), listString.hashCode());
}
public void testConcat() {
byte[] referenceBytes = getTestBytes(77748, 113344L);
ByteString literalString = ByteString.copyFrom(referenceBytes);
List<ByteString> pieces = makeConcretePieces(referenceBytes);
Iterator<ByteString> iter = pieces.iterator();
ByteString concatenatedString = iter.next();
while (iter.hasNext()) {
concatenatedString = concatenatedString.concat(iter.next());
}
assertTrue("Concatenated string must be equal to literal string",
concatenatedString.equals(literalString));
assertEquals("Concatenated string must have same hashcode as literal string",
literalString.hashCode(), concatenatedString.hashCode());
}
/**
* Test the Rope implementation can deal with Empty nodes, even though we
* guard against them. See also {@link LiteralByteStringTest#testConcat_empty()}.
*/
public void testConcat_empty() {
byte[] referenceBytes = getTestBytes(7748, 113344L);
ByteString literalString = ByteString.copyFrom(referenceBytes);
ByteString duo = RopeByteString.newInstanceForTest(literalString, literalString);
ByteString temp = RopeByteString.newInstanceForTest(
RopeByteString.newInstanceForTest(literalString, ByteString.EMPTY),
RopeByteString.newInstanceForTest(ByteString.EMPTY, literalString));
ByteString quintet = RopeByteString.newInstanceForTest(temp, ByteString.EMPTY);
assertTrue("String with concatenated nulls must equal simple concatenate",
duo.equals(quintet));
assertEquals("String with concatenated nulls have same hashcode as simple concatenate",
duo.hashCode(), quintet.hashCode());
ByteString.ByteIterator duoIter = duo.iterator();
ByteString.ByteIterator quintetIter = quintet.iterator();
boolean stillEqual = true;
while (stillEqual && quintetIter.hasNext()) {
stillEqual = (duoIter.nextByte() == quintetIter.nextByte());
}
assertTrue("We must get the same characters by iterating", stillEqual);
assertFalse("Iterator must be exhausted", duoIter.hasNext());
try {
duoIter.nextByte();
fail("Should have thrown an exception.");
} catch (NoSuchElementException e) {
// This is success
}
try {
quintetIter.nextByte();
fail("Should have thrown an exception.");
} catch (NoSuchElementException e) {
// This is success
}
// Test that even if we force empty strings in as rope leaves in this
// configuration, we always get a (possibly Bounded) LiteralByteString
// for a length 1 substring.
//
// It is possible, using the testing factory method to create deeply nested
// trees of empty leaves, to make a string that will fail this test.
for (int i = 1; i < duo.size(); ++i) {
assertTrue("Substrings of size() < 2 must not be RopeByteStrings",
duo.substring(i - 1, i) instanceof LiteralByteString);
}
for (int i = 1; i < quintet.size(); ++i) {
assertTrue("Substrings of size() < 2 must not be RopeByteStrings",
quintet.substring(i - 1, i) instanceof LiteralByteString);
}
}
public void testStartsWith() {
byte[] bytes = getTestBytes(1000, 1234L);
ByteString string = ByteString.copyFrom(bytes);
ByteString prefix = ByteString.copyFrom(bytes, 0, 500);
ByteString suffix = ByteString.copyFrom(bytes, 400, 600);
assertTrue(string.startsWith(ByteString.EMPTY));
assertTrue(string.startsWith(string));
assertTrue(string.startsWith(prefix));
assertFalse(string.startsWith(suffix));
assertFalse(prefix.startsWith(suffix));
assertFalse(suffix.startsWith(prefix));
assertFalse(ByteString.EMPTY.startsWith(prefix));
assertTrue(ByteString.EMPTY.startsWith(ByteString.EMPTY));
}
public void testEndsWith() {
byte[] bytes = getTestBytes(1000, 1234L);
ByteString string = ByteString.copyFrom(bytes);
ByteString prefix = ByteString.copyFrom(bytes, 0, 500);
ByteString suffix = ByteString.copyFrom(bytes, 400, 600);
assertTrue(string.endsWith(ByteString.EMPTY));
assertTrue(string.endsWith(string));
assertTrue(string.endsWith(suffix));
assertFalse(string.endsWith(prefix));
assertFalse(suffix.endsWith(prefix));
assertFalse(prefix.endsWith(suffix));
assertFalse(ByteString.EMPTY.endsWith(suffix));
assertTrue(ByteString.EMPTY.endsWith(ByteString.EMPTY));
}
static List<ByteString> makeConcretePieces(byte[] referenceBytes) {
List<ByteString> pieces = new ArrayList<ByteString>();
// Starting length should be small enough that we'll do some concatenating by
// copying if we just concatenate all these pieces together.
for (int start = 0, length = 16; start < referenceBytes.length; start += length) {
length = (length << 1) - 1;
if (start + length > referenceBytes.length) {
length = referenceBytes.length - start;
}
pieces.add(ByteString.copyFrom(referenceBytes, start, length));
}
return pieces;
}
private byte[] substringUsingWriteTo(
ByteString data, int offset, int length) throws IOException {
ByteArrayOutputStream output = new ByteArrayOutputStream();
data.writeTo(output, offset, length);
return output.toByteArray();
}
public void testWriteToOutputStream() throws Exception {
// Choose a size large enough so when two ByteStrings are concatenated they
// won't be merged into one byte array due to some optimizations.
final int dataSize = ByteString.CONCATENATE_BY_COPY_SIZE + 1;
byte[] data1 = new byte[dataSize];
for (int i = 0; i < data1.length; i++) {
data1[i] = (byte) 1;
}
data1[1] = (byte) 11;
// Test LiteralByteString.writeTo(OutputStream,int,int)
LiteralByteString left = new LiteralByteString(data1);
byte[] result = substringUsingWriteTo(left, 1, 1);
assertEquals(1, result.length);
assertEquals((byte) 11, result[0]);
byte[] data2 = new byte[dataSize];
for (int i = 0; i < data1.length; i++) {
data2[i] = (byte) 2;
}
LiteralByteString right = new LiteralByteString(data2);
// Concatenate two ByteStrings to create a RopeByteString.
ByteString root = left.concat(right);
// Make sure we are actually testing a RopeByteString with a simple tree
// structure.
assertEquals(1, root.getTreeDepth());
// Write parts of the left node.
result = substringUsingWriteTo(root, 0, dataSize);
assertEquals(dataSize, result.length);
assertEquals((byte) 1, result[0]);
assertEquals((byte) 1, result[dataSize - 1]);
// Write parts of the right node.
result = substringUsingWriteTo(root, dataSize, dataSize);
assertEquals(dataSize, result.length);
assertEquals((byte) 2, result[0]);
assertEquals((byte) 2, result[dataSize - 1]);
// Write a segment of bytes that runs across both nodes.
result = substringUsingWriteTo(root, dataSize / 2, dataSize);
assertEquals(dataSize, result.length);
assertEquals((byte) 1, result[0]);
assertEquals((byte) 1, result[dataSize - dataSize / 2 - 1]);
assertEquals((byte) 2, result[dataSize - dataSize / 2]);
assertEquals((byte) 2, result[dataSize - 1]);
}
}