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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/client/plugin/compression.h"
#include <assert.h>
namespace remoting {
static const int kZLIB_CHUNK = 256 * 1024;
ZCompressor::ZCompressor() {
stream_.zalloc = Z_NULL;
stream_.zfree = Z_NULL;
stream_.opaque = Z_NULL;
deflateInit(&stream_, Z_BEST_SPEED);
}
void ZCompressor::WriteInternal(char* buffer, int size, int flush) {
stream_.avail_in = size;
stream_.next_in = reinterpret_cast<Bytef*>(buffer);
// Expand the internal buffer.
while (true) {
int last_size = buffer_.size();
buffer_.resize(last_size + kZLIB_CHUNK);
stream_.avail_out = kZLIB_CHUNK;
stream_.next_out = reinterpret_cast<Bytef*>(&buffer_[last_size]);
int ret = deflate(&stream_, flush);
assert(ret != Z_STREAM_ERROR);
// Shrink the size of the vector. It doesn't alter the capacity.
int compressed = kZLIB_CHUNK - stream_.avail_out;
buffer_.resize(last_size + compressed);
if (!compressed)
break;
}
}
void ZCompressor::Write(char* buffer, int size) {
WriteInternal(buffer, size, Z_NO_FLUSH);
}
void ZCompressor::Flush() {
WriteInternal(NULL, 0, Z_FINISH);
deflateEnd(&stream_);
}
int ZCompressor::GetCompressedSize() {
return buffer_.size();
}
char* ZCompressor::GetCompressedData() {
return &buffer_[0];
}
int ZCompressor::GetRawSize() {
// I don't care about this.
return 0;
}
ZDecompressor::ZDecompressor() {
stream_.zalloc = Z_NULL;
stream_.zfree = Z_NULL;
stream_.opaque = Z_NULL;
stream_.avail_in = 0;
stream_.next_in = Z_NULL;
inflateInit(&stream_);
}
void ZDecompressor::WriteInternal(char* buffer, int size, int flush) {
stream_.avail_in = size;
stream_.next_in = reinterpret_cast<Bytef*>(buffer);
while (true) {
int last_size = buffer_.size();
buffer_.resize(last_size + kZLIB_CHUNK);
stream_.avail_out = kZLIB_CHUNK;
stream_.next_out = reinterpret_cast<Bytef*>(&buffer_[last_size]);
int ret = inflate(&stream_, flush);
assert(ret != Z_STREAM_ERROR);
// Shrink the size of the vector. It doesn't alter the capacity.
int decompressed = kZLIB_CHUNK - stream_.avail_out;
buffer_.resize(last_size + decompressed);
if (!decompressed)
break;
}
}
void ZDecompressor::Write(char* buffer, int size) {
WriteInternal(buffer, size, Z_NO_FLUSH);
}
void ZDecompressor::Flush() {
inflateEnd(&stream_);
}
char* ZDecompressor::GetRawData() {
return &buffer_[0];
}
int ZDecompressor::GetRawSize() {
return buffer_.size();
}
int ZDecompressor::GetCompressedSize() {
// I don't care.
return 0;
}
} // namespace remoting
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