Alex Deymo | aea4c1c | 2015-08-19 20:24:43 -0700 | [diff] [blame^] | 1 | // |
| 2 | // Copyright (C) 2009 The Android Open Source Project |
| 3 | // |
| 4 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | // you may not use this file except in compliance with the License. |
| 6 | // You may obtain a copy of the License at |
| 7 | // |
| 8 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | // |
| 10 | // Unless required by applicable law or agreed to in writing, software |
| 11 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | // See the License for the specific language governing permissions and |
| 14 | // limitations under the License. |
| 15 | // |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 16 | |
| 17 | #include "update_engine/bzip_extent_writer.h" |
| 18 | |
| 19 | using std::vector; |
| 20 | |
| 21 | namespace chromeos_update_engine { |
| 22 | |
| 23 | namespace { |
Alex Vakulenko | f68bbbc | 2015-02-09 12:53:18 -0800 | [diff] [blame] | 24 | const chromeos::Blob::size_type kOutputBufferLength = 16 * 1024; |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 25 | } |
| 26 | |
Nam T. Nguyen | f1d582e | 2014-12-08 15:07:17 -0800 | [diff] [blame] | 27 | bool BzipExtentWriter::Init(FileDescriptorPtr fd, |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 28 | const vector<Extent>& extents, |
Andrew de los Reyes | 09e56d6 | 2010-04-23 13:45:53 -0700 | [diff] [blame] | 29 | uint32_t block_size) { |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 30 | // Init bzip2 stream |
| 31 | int rc = BZ2_bzDecompressInit(&stream_, |
Alex Vakulenko | d2779df | 2014-06-16 13:19:00 -0700 | [diff] [blame] | 32 | 0, // verbosity. (0 == silent) |
| 33 | 0); // 0 = faster algo, more memory |
| 34 | |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 35 | TEST_AND_RETURN_FALSE(rc == BZ_OK); |
| 36 | |
| 37 | return next_->Init(fd, extents, block_size); |
| 38 | } |
| 39 | |
| 40 | bool BzipExtentWriter::Write(const void* bytes, size_t count) { |
Alex Vakulenko | f68bbbc | 2015-02-09 12:53:18 -0800 | [diff] [blame] | 41 | chromeos::Blob output_buffer(kOutputBufferLength); |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 42 | |
Darin Petkov | e062239 | 2013-04-24 12:56:19 +0200 | [diff] [blame] | 43 | // Copy the input data into |input_buffer_| only if |input_buffer_| already |
| 44 | // contains unconsumed data. Otherwise, process the data directly from the |
| 45 | // source. |
Alex Vakulenko | f68bbbc | 2015-02-09 12:53:18 -0800 | [diff] [blame] | 46 | const uint8_t* input = reinterpret_cast<const uint8_t*>(bytes); |
| 47 | const uint8_t* input_end = input + count; |
Darin Petkov | e062239 | 2013-04-24 12:56:19 +0200 | [diff] [blame] | 48 | if (!input_buffer_.empty()) { |
| 49 | input_buffer_.insert(input_buffer_.end(), input, input_end); |
Alex Vakulenko | f68bbbc | 2015-02-09 12:53:18 -0800 | [diff] [blame] | 50 | input = input_buffer_.data(); |
Darin Petkov | e062239 | 2013-04-24 12:56:19 +0200 | [diff] [blame] | 51 | input_end = input + input_buffer_.size(); |
| 52 | } |
Alex Vakulenko | f68bbbc | 2015-02-09 12:53:18 -0800 | [diff] [blame] | 53 | stream_.next_in = reinterpret_cast<char*>(const_cast<uint8_t*>(input)); |
Darin Petkov | e062239 | 2013-04-24 12:56:19 +0200 | [diff] [blame] | 54 | stream_.avail_in = input_end - input; |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 55 | |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 56 | for (;;) { |
Alex Vakulenko | f68bbbc | 2015-02-09 12:53:18 -0800 | [diff] [blame] | 57 | stream_.next_out = reinterpret_cast<char*>(output_buffer.data()); |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 58 | stream_.avail_out = output_buffer.size(); |
| 59 | |
| 60 | int rc = BZ2_bzDecompress(&stream_); |
| 61 | TEST_AND_RETURN_FALSE(rc == BZ_OK || rc == BZ_STREAM_END); |
Darin Petkov | e062239 | 2013-04-24 12:56:19 +0200 | [diff] [blame] | 62 | |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 63 | if (stream_.avail_out == output_buffer.size()) |
| 64 | break; // got no new bytes |
Darin Petkov | e062239 | 2013-04-24 12:56:19 +0200 | [diff] [blame] | 65 | |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 66 | TEST_AND_RETURN_FALSE( |
Alex Vakulenko | f68bbbc | 2015-02-09 12:53:18 -0800 | [diff] [blame] | 67 | next_->Write(output_buffer.data(), |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 68 | output_buffer.size() - stream_.avail_out)); |
Darin Petkov | e062239 | 2013-04-24 12:56:19 +0200 | [diff] [blame] | 69 | |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 70 | if (rc == BZ_STREAM_END) |
Alex Vakulenko | f68bbbc | 2015-02-09 12:53:18 -0800 | [diff] [blame] | 71 | CHECK_EQ(stream_.avail_in, 0u); |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 72 | if (stream_.avail_in == 0) |
| 73 | break; // no more input to process |
| 74 | } |
| 75 | |
Darin Petkov | e062239 | 2013-04-24 12:56:19 +0200 | [diff] [blame] | 76 | // Store unconsumed data (if any) in |input_buffer_|. |
| 77 | if (stream_.avail_in || !input_buffer_.empty()) { |
Alex Vakulenko | f68bbbc | 2015-02-09 12:53:18 -0800 | [diff] [blame] | 78 | chromeos::Blob new_input_buffer(input_end - stream_.avail_in, input_end); |
Darin Petkov | e062239 | 2013-04-24 12:56:19 +0200 | [diff] [blame] | 79 | new_input_buffer.swap(input_buffer_); |
| 80 | } |
| 81 | |
Andrew de los Reyes | 8006106 | 2010-02-04 14:25:00 -0800 | [diff] [blame] | 82 | return true; |
| 83 | } |
| 84 | |
| 85 | bool BzipExtentWriter::EndImpl() { |
| 86 | TEST_AND_RETURN_FALSE(input_buffer_.empty()); |
| 87 | TEST_AND_RETURN_FALSE(BZ2_bzDecompressEnd(&stream_) == BZ_OK); |
| 88 | return next_->End(); |
| 89 | } |
| 90 | |
| 91 | } // namespace chromeos_update_engine |