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// Copyright (c) 2010 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <stdlib.h>
#include "remoting/base/compressor_zlib.h"
#include "remoting/base/decompressor_zlib.h"
#include "testing/gtest/include/gtest/gtest.h"
static void GenerateTestData(uint8* data, int size, int seed) {
srand(seed);
for (int i = 0; i < size; ++i)
data[i] = rand() % 256;
}
// Keep compressing |input_data| into |output_data| until the last
// bytes is consumed.
//
// The compressed size is written to |compressed_size|.
static void Compress(remoting::Compressor* compressor,
const uint8* input_data, int input_size,
uint8* output_data, int output_size,
int* compressed_size) {
*compressed_size = 0;
while (true) {
int consumed, written;
bool ret = compressor->Process(input_data, input_size,
output_data, output_size,
&consumed, &written);
input_data += consumed;
input_size -= consumed;
output_data += written;
output_size -= written;
*compressed_size += written;
if (!ret)
break;
}
}
// The decompressed size is written to |decompressed_size|.
static void Decompress(remoting::Decompressor* decompressor,
const uint8* input_data, int input_size,
uint8* output_data, int output_size,
int* decompressed_size) {
*decompressed_size = 0;
while (true) {
int consumed, written;
bool ret = decompressor->Process(input_data, input_size,
output_data, output_size,
&consumed, &written);
input_data += consumed;
input_size -= consumed;
output_data += written;
output_size -= written;
*decompressed_size += written;
if (!ret)
break;
}
}
TEST(DecompressorZlibTest, CompressAndDecompress) {
static const int kRawDataSize = 1024 * 128;
static const int kCompressedDataSize = 2 * kRawDataSize;
static const int kDecompressedDataSize = kRawDataSize;
uint8 raw_data[kRawDataSize];
uint8 compressed_data[kCompressedDataSize];
uint8 decompressed_data[kDecompressedDataSize];
// Generate the test data.g
GenerateTestData(raw_data, kRawDataSize, 99);
// Then use the compressor.
remoting::CompressorZlib compressor;
int compressed_size = 0;
Compress(&compressor, raw_data, kRawDataSize,
compressed_data, kCompressedDataSize,
&compressed_size);
// Then use the decompressor.
remoting::DecompressorZlib decompressor;
int decompressed_size = 0;
Decompress(&decompressor, compressed_data, compressed_size,
decompressed_data, kDecompressedDataSize,
&decompressed_size);
EXPECT_EQ(kRawDataSize, decompressed_size);
EXPECT_EQ(0, memcmp(raw_data, decompressed_data, decompressed_size));
}
// Checks that zlib can work with a small output buffer by limiting
// number of bytes it gets from the input.
TEST(DecompressorZlibTest, SmallOutputBuffer) {
static const int kRawDataSize = 1024 * 128;
static const int kCompressedDataSize = 2 * kRawDataSize;
uint8 raw_data[kRawDataSize];
uint8 compressed_data[kCompressedDataSize];
// Generate the test data.
GenerateTestData(raw_data, kRawDataSize, 99);
// Then use the compressor to compress.
remoting::CompressorZlib compressor;
int compressed_size = 0;
Compress(&compressor, raw_data, kRawDataSize,
compressed_data, kCompressedDataSize,
&compressed_size);
// Then use the decompressor. We decompress into a 1 byte buffer
// every time.
remoting::DecompressorZlib decompressor;
uint8* input_data = compressed_data;
int input_size = compressed_size;
int decompressed_size = 0;
while (true) {
int consumed, written;
uint8 output_data;
bool ret = decompressor.Process(input_data, input_size,
&output_data, 1,
&consumed, &written);
input_data += consumed;
input_size -= consumed;
// Expect that there's only one byte written.
EXPECT_EQ(1, written);
decompressed_size += written;
if (!ret)
break;
}
EXPECT_EQ(kRawDataSize, decompressed_size);
}
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