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// Copyright 2017 The Chromium OS 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 "bsdiff/bz2_decompressor.h"
#include <algorithm>
#include <limits>
#include <bzlib.h>
#include "bsdiff/logging.h"
namespace bsdiff {
BZ2Decompressor::~BZ2Decompressor() {
// Release the memory on destruction if needed.
if (stream_initialized_)
BZ2_bzDecompressEnd(&stream_);
}
bool BZ2Decompressor::SetInputData(const uint8_t* input_data, size_t size) {
// TODO(xunchang) update the avail_in for size > 2GB.
if (size > std::numeric_limits<unsigned int>::max()) {
LOG(ERROR) << "Oversized input data" << size;
return false;
}
stream_.next_in = reinterpret_cast<char*>(const_cast<uint8_t*>(input_data));
stream_.avail_in = size;
stream_.bzalloc = nullptr;
stream_.bzfree = nullptr;
stream_.opaque = nullptr;
int bz2err = BZ2_bzDecompressInit(&stream_, 0, 0);
if (bz2err != BZ_OK) {
LOG(ERROR) << "Failed to bzinit control stream: " << bz2err;
return false;
}
stream_initialized_ = true;
return true;
}
bool BZ2Decompressor::Read(uint8_t* output_data, size_t bytes_to_output) {
if (!stream_initialized_) {
LOG(ERROR) << "BZ2Decompressor not initialized";
return false;
}
stream_.next_out = reinterpret_cast<char*>(output_data);
while (bytes_to_output > 0) {
size_t output_size = std::min<size_t>(
std::numeric_limits<unsigned int>::max(), bytes_to_output);
stream_.avail_out = output_size;
size_t prev_avail_in = stream_.avail_in;
int bz2err = BZ2_bzDecompress(&stream_);
if (bz2err != BZ_OK && bz2err != BZ_STREAM_END) {
LOG(ERROR) << "Failed to decompress " << output_size
<< " bytes of data, error: " << bz2err;
return false;
}
bytes_to_output -= (output_size - stream_.avail_out);
if (bytes_to_output && prev_avail_in == stream_.avail_in &&
output_size == stream_.avail_out) {
LOG(ERROR) << "BZ2Decompressor made no progress, pending "
<< bytes_to_output << " bytes to decompress";
return false;
}
}
return true;
}
bool BZ2Decompressor::Close() {
if (!stream_initialized_) {
LOG(ERROR) << "BZ2Decompressor not initialized";
return false;
}
int bz2err = BZ2_bzDecompressEnd(&stream_);
if (bz2err != BZ_OK) {
LOG(ERROR) << "BZ2_bzDecompressEnd returns with " << bz2err;
return false;
}
stream_initialized_ = false;
return true;
}
} // namespace bsdiff
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