blob: e200e2dbe2c52f3a071fd26e31ef6c5bb2ddc290 [file] [log] [blame]
// Copyright (c) 2009 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 "update_engine/bzip_extent_writer.h"
using std::vector;
namespace chromeos_update_engine {
namespace {
const vector<char>::size_type kOutputBufferLength = 1024 * 1024;
}
bool BzipExtentWriter::Init(int fd,
const vector<Extent>& extents,
uint32_t block_size) {
// Init bzip2 stream
int rc = BZ2_bzDecompressInit(&stream_,
0, // verbosity. (0 == silent)
0 // 0 = faster algo, more memory
);
TEST_AND_RETURN_FALSE(rc == BZ_OK);
return next_->Init(fd, extents, block_size);
}
bool BzipExtentWriter::Write(const void* bytes, size_t count) {
vector<char> output_buffer(kOutputBufferLength);
const char* c_bytes = reinterpret_cast<const char*>(bytes);
input_buffer_.insert(input_buffer_.end(), c_bytes, c_bytes + count);
stream_.next_in = &input_buffer_[0];
stream_.avail_in = input_buffer_.size();
for (;;) {
stream_.next_out = &output_buffer[0];
stream_.avail_out = output_buffer.size();
int rc = BZ2_bzDecompress(&stream_);
TEST_AND_RETURN_FALSE(rc == BZ_OK || rc == BZ_STREAM_END);
if (stream_.avail_out == output_buffer.size())
break; // got no new bytes
TEST_AND_RETURN_FALSE(
next_->Write(&output_buffer[0],
output_buffer.size() - stream_.avail_out));
if (rc == BZ_STREAM_END)
CHECK_EQ(stream_.avail_in, 0);
if (stream_.avail_in == 0)
break; // no more input to process
}
// store unconsumed data in input_buffer_.
vector<char> new_input_buffer(input_buffer_.end() - stream_.avail_in,
input_buffer_.end());
new_input_buffer.swap(input_buffer_);
return true;
}
bool BzipExtentWriter::EndImpl() {
TEST_AND_RETURN_FALSE(input_buffer_.empty());
TEST_AND_RETURN_FALSE(BZ2_bzDecompressEnd(&stream_) == BZ_OK);
return next_->End();
}
} // namespace chromeos_update_engine