Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 1 | // Copyright 2017 The Chromium OS Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "bsdiff/brotli_compressor.h" |
| 6 | |
| 7 | #include "bsdiff/logging.h" |
| 8 | |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 9 | namespace { |
Tianjie Xu | 1f1cdb2 | 2017-11-20 11:05:55 -0800 | [diff] [blame] | 10 | |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 11 | const size_t kBufferSize = 1024 * 1024; |
Tianjie Xu | 1f1cdb2 | 2017-11-20 11:05:55 -0800 | [diff] [blame] | 12 | const uint32_t kBrotliDefaultLgwin = 20; |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 13 | |
| 14 | } // namespace |
| 15 | |
| 16 | namespace bsdiff { |
Tianjie Xu | 1f1cdb2 | 2017-11-20 11:05:55 -0800 | [diff] [blame] | 17 | BrotliCompressor::BrotliCompressor(int quality) : comp_buffer_(kBufferSize) { |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 18 | brotli_encoder_state_ = |
| 19 | BrotliEncoderCreateInstance(nullptr, nullptr, nullptr); |
| 20 | if (!brotli_encoder_state_) { |
Tianjie Xu | 18480eb | 2017-11-29 16:21:43 -0800 | [diff] [blame] | 21 | LOG(ERROR) << "Failed to initialize brotli decoder state"; |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 22 | } else { |
Tianjie Xu | 1f1cdb2 | 2017-11-20 11:05:55 -0800 | [diff] [blame] | 23 | int compression_quality = quality; |
| 24 | if (compression_quality > BROTLI_MAX_QUALITY || |
| 25 | compression_quality < BROTLI_MIN_QUALITY) { |
| 26 | LOG(ERROR) << "Invalid quality value: " << quality |
| 27 | << ", using default quality instead."; |
| 28 | compression_quality = BROTLI_MAX_QUALITY; |
| 29 | } |
| 30 | |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 31 | BrotliEncoderSetParameter(brotli_encoder_state_, BROTLI_PARAM_QUALITY, |
Tianjie Xu | 1f1cdb2 | 2017-11-20 11:05:55 -0800 | [diff] [blame] | 32 | compression_quality); |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 33 | BrotliEncoderSetParameter(brotli_encoder_state_, BROTLI_PARAM_LGWIN, |
Tianjie Xu | 1f1cdb2 | 2017-11-20 11:05:55 -0800 | [diff] [blame] | 34 | kBrotliDefaultLgwin); |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 35 | } |
| 36 | } |
| 37 | |
| 38 | BrotliCompressor::~BrotliCompressor() { |
| 39 | if (brotli_encoder_state_) { |
| 40 | BrotliEncoderDestroyInstance(brotli_encoder_state_); |
| 41 | } |
| 42 | } |
| 43 | |
| 44 | bool BrotliCompressor::Write(const uint8_t* buf, size_t size) { |
| 45 | if (!brotli_encoder_state_) |
| 46 | return false; |
| 47 | |
| 48 | const uint8_t* next_in = buf; |
| 49 | size_t avail_in = size; |
| 50 | while (avail_in > 0) { |
| 51 | size_t avail_out = kBufferSize; |
| 52 | uint8_t* next_out = comp_buffer_.buffer_data(); |
| 53 | if (!BrotliEncoderCompressStream( |
| 54 | brotli_encoder_state_, BROTLI_OPERATION_PROCESS, &avail_in, |
| 55 | &next_in, &avail_out, &next_out, nullptr)) { |
| 56 | LOG(ERROR) << "BrotliCompressor failed to compress " << avail_in |
Tianjie Xu | 18480eb | 2017-11-29 16:21:43 -0800 | [diff] [blame] | 57 | << " bytes of data."; |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 58 | return false; |
| 59 | } |
| 60 | |
| 61 | uint64_t output_bytes = comp_buffer_.buffer_size() - avail_out; |
| 62 | if (output_bytes > 0) { |
| 63 | comp_buffer_.AddDataToChunks(output_bytes); |
| 64 | } |
| 65 | } |
| 66 | return true; |
| 67 | } |
| 68 | |
| 69 | bool BrotliCompressor::Finish() { |
| 70 | if (!brotli_encoder_state_) |
| 71 | return false; |
| 72 | |
| 73 | const uint8_t* next_in = nullptr; |
| 74 | size_t avail_in = 0; |
| 75 | while (!BrotliEncoderIsFinished(brotli_encoder_state_)) { |
| 76 | size_t avail_out = kBufferSize; |
| 77 | uint8_t* next_out = comp_buffer_.buffer_data(); |
| 78 | if (!BrotliEncoderCompressStream( |
| 79 | brotli_encoder_state_, BROTLI_OPERATION_FINISH, &avail_in, &next_in, |
| 80 | &avail_out, &next_out, nullptr)) { |
Tianjie Xu | 18480eb | 2017-11-29 16:21:43 -0800 | [diff] [blame] | 81 | LOG(ERROR) << "BrotliCompressor failed to finish compression"; |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 82 | return false; |
| 83 | } |
| 84 | |
| 85 | uint64_t output_bytes = comp_buffer_.buffer_size() - avail_out; |
| 86 | if (output_bytes > 0) { |
| 87 | comp_buffer_.AddDataToChunks(output_bytes); |
| 88 | } |
| 89 | } |
| 90 | return true; |
| 91 | } |
| 92 | |
| 93 | const std::vector<uint8_t>& BrotliCompressor::GetCompressedData() { |
| 94 | return comp_buffer_.GetCompressedData(); |
| 95 | } |
| 96 | |
| 97 | } // namespace bsdiff |