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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 "remoting/base/compressor_zlib.h"
#if defined(USE_SYSTEM_ZLIB)
#include <zlib.h>
// The code below uses the MOZ_Z_ forms of these functions in order that things
// should work on Windows. In order to make this code cross platform, we map
// back to the normal functions here in the case that we are using the system
// zlib.
#define MOZ_Z_deflate deflate
#define MOZ_Z_deflateEnd deflateEnd
#define MOZ_Z_deflateInit_ deflateInit_
#else
#include "third_party/zlib/zlib.h"
#endif
#include "base/logging.h"
namespace remoting {
CompressorZlib::CompressorZlib() {
stream_.reset(new z_stream());
stream_->next_in = Z_NULL;
stream_->zalloc = Z_NULL;
stream_->zfree = Z_NULL;
stream_->opaque = Z_NULL;
deflateInit(stream_.get(), Z_BEST_SPEED);
}
CompressorZlib::~CompressorZlib() {
deflateEnd(stream_.get());
}
bool CompressorZlib::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 = deflate(stream_.get(), input_size ? Z_NO_FLUSH : Z_FINISH);
if (ret == Z_STREAM_ERROR) {
NOTREACHED() << "zlib compression failed";
}
*consumed = input_size - stream_->avail_in;
*written = output_size - stream_->avail_out;
// Return true when we get Z_BUF_ERROR, this way we can feed more data
// to zlib.
return ret == Z_OK || ret == Z_BUF_ERROR;
}
} // namespace remoting
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