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// Copyright (c) 2011 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 "remoting/base/decompressor_zlib.h"
#if defined(USE_SYSTEM_ZLIB)
#include <zlib.h>
#else
#include "third_party/zlib/zlib.h"
#endif
#include "base/logging.h"
namespace remoting {
DecompressorZlib::DecompressorZlib() {
InitStream();
}
DecompressorZlib::~DecompressorZlib() {
inflateEnd(stream_.get());
}
void DecompressorZlib::Reset() {
inflateEnd(stream_.get());
InitStream();
}
bool DecompressorZlib::Process(const uint8* input_data, int input_size,
uint8* output_data, int output_size,
int* consumed, int* written) {
DCHECK_GT(output_size, 0);
// Setup I/O parameters.
stream_->avail_in = input_size;
stream_->next_in = (Bytef*)input_data;
stream_->avail_out = output_size;
stream_->next_out = (Bytef*)output_data;
int ret = inflate(stream_.get(), Z_NO_FLUSH);
if (ret == Z_STREAM_ERROR) {
NOTREACHED() << "zlib compression failed";
}
*consumed = input_size - stream_->avail_in;
*written = output_size - stream_->avail_out;
// Since we check that output is always greater than 0, the only
// reason for us to get Z_BUF_ERROR is when zlib requires more input
// data.
return ret == Z_OK || ret == Z_BUF_ERROR;
}
void DecompressorZlib::InitStream() {
stream_.reset(new z_stream());
stream_->next_in = Z_NULL;
stream_->zalloc = Z_NULL;
stream_->zfree = Z_NULL;
stream_->opaque = Z_NULL;
int ret = inflateInit(stream_.get());
DCHECK_EQ(ret, Z_OK);
}
} // namespace remoting
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