//
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// Copyright (C) 2009 The Android Open Source Project
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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#include "update_engine/payload_consumer/bzip_extent_writer.h"
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using google::protobuf::RepeatedPtrField;
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namespace chromeos_update_engine {
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namespace {
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const brillo::Blob::size_type kOutputBufferLength = 16 * 1024;
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}
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BzipExtentWriter::~BzipExtentWriter() {
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TEST_AND_RETURN(BZ2_bzDecompressEnd(&stream_) == BZ_OK);
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TEST_AND_RETURN(input_buffer_.empty());
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}
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bool BzipExtentWriter::Init(FileDescriptorPtr fd,
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const RepeatedPtrField<Extent>& extents,
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uint32_t block_size) {
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// Init bzip2 stream
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int rc = BZ2_bzDecompressInit(&stream_,
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0, // verbosity. (0 == silent)
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0); // 0 = faster algo, more memory
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TEST_AND_RETURN_FALSE(rc == BZ_OK);
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return next_->Init(fd, extents, block_size);
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}
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bool BzipExtentWriter::Write(const void* bytes, size_t count) {
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brillo::Blob output_buffer(kOutputBufferLength);
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// Copy the input data into |input_buffer_| only if |input_buffer_| already
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// contains unconsumed data. Otherwise, process the data directly from the
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// source.
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const uint8_t* input = reinterpret_cast<const uint8_t*>(bytes);
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const uint8_t* input_end = input + count;
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if (!input_buffer_.empty()) {
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input_buffer_.insert(input_buffer_.end(), input, input_end);
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input = input_buffer_.data();
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input_end = input + input_buffer_.size();
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}
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stream_.next_in = reinterpret_cast<char*>(const_cast<uint8_t*>(input));
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stream_.avail_in = input_end - input;
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for (;;) {
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stream_.next_out = reinterpret_cast<char*>(output_buffer.data());
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stream_.avail_out = output_buffer.size();
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int rc = BZ2_bzDecompress(&stream_);
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TEST_AND_RETURN_FALSE(rc == BZ_OK || rc == BZ_STREAM_END);
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if (stream_.avail_out == output_buffer.size())
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break; // got no new bytes
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TEST_AND_RETURN_FALSE(next_->Write(
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output_buffer.data(), output_buffer.size() - stream_.avail_out));
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if (rc == BZ_STREAM_END)
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CHECK_EQ(stream_.avail_in, 0u);
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if (stream_.avail_in == 0)
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break; // no more input to process
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}
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// Store unconsumed data (if any) in |input_buffer_|.
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if (stream_.avail_in || !input_buffer_.empty()) {
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brillo::Blob new_input_buffer(input_end - stream_.avail_in, input_end);
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new_input_buffer.swap(input_buffer_);
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}
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return true;
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}
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} // namespace chromeos_update_engine
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