Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [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 | #ifndef _BSDIFF_PATCH_WRITER_H_ |
| 6 | #define _BSDIFF_PATCH_WRITER_H_ |
| 7 | |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 8 | #include <memory> |
Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [diff] [blame] | 9 | #include <string> |
| 10 | #include <vector> |
| 11 | |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 12 | #include "bsdiff/compressor_interface.h" |
Alex Deymo | 538a75d | 2017-09-27 15:34:59 +0200 | [diff] [blame] | 13 | #include "bsdiff/patch_writer_interface.h" |
Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [diff] [blame] | 14 | |
| 15 | namespace bsdiff { |
| 16 | |
Tianjie Xu | 1f1cdb2 | 2017-11-20 11:05:55 -0800 | [diff] [blame] | 17 | // A PatchWriterInterface class with three compressors and a 32-byte header. |
Alex Deymo | 538a75d | 2017-09-27 15:34:59 +0200 | [diff] [blame] | 18 | class BsdiffPatchWriter : public PatchWriterInterface { |
Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [diff] [blame] | 19 | public: |
Tianjie Xu | 1f1cdb2 | 2017-11-20 11:05:55 -0800 | [diff] [blame] | 20 | // Create the patch writer using the upstream's "BSDIFF40" format. It uses |
| 21 | // bz2 as the compression algorithm and the file |patch_filename| to write |
| 22 | // the patch data. |
| 23 | explicit BsdiffPatchWriter(const std::string& patch_filename); |
| 24 | |
| 25 | // Create the patch writer using the "BSDF2" format. It uses the compressor |
| 26 | // with algorithm |type| and quality |quality|. This writer also writes the |
| 27 | // patch data to the file |patch_filename|. |
| 28 | BsdiffPatchWriter(const std::string& patch_filename, |
| 29 | CompressorType type, |
| 30 | int quality); |
Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [diff] [blame] | 31 | |
Alex Deymo | 538a75d | 2017-09-27 15:34:59 +0200 | [diff] [blame] | 32 | // PatchWriterInterface overrides. |
Alex Deymo | 4dadd8b | 2017-10-26 16:19:33 +0200 | [diff] [blame] | 33 | bool Init(size_t new_size) override; |
Alex Deymo | 68c0e7f | 2017-10-02 20:38:12 +0200 | [diff] [blame] | 34 | bool WriteDiffStream(const uint8_t* data, size_t size) override; |
| 35 | bool WriteExtraStream(const uint8_t* data, size_t size) override; |
Alex Deymo | 538a75d | 2017-09-27 15:34:59 +0200 | [diff] [blame] | 36 | bool AddControlEntry(const ControlEntry& entry) override; |
| 37 | bool Close() override; |
Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [diff] [blame] | 38 | |
| 39 | private: |
| 40 | // Write the BSDIFF patch header to the |fp_| given the size of the compressed |
| 41 | // control block and the compressed diff block. |
| 42 | bool WriteHeader(uint64_t ctrl_size, uint64_t diff_size); |
| 43 | |
Alex Deymo | 68c0e7f | 2017-10-02 20:38:12 +0200 | [diff] [blame] | 44 | // Bytes of the new files already written. Needed to store the new length in |
| 45 | // the header of the file. |
Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [diff] [blame] | 46 | uint64_t written_output_{0}; |
| 47 | |
Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [diff] [blame] | 48 | // The current file we are writing to. |
| 49 | FILE* fp_{nullptr}; |
Alex Deymo | 538a75d | 2017-09-27 15:34:59 +0200 | [diff] [blame] | 50 | std::string patch_filename_; |
Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [diff] [blame] | 51 | |
Tianjie Xu | b4cba64 | 2017-11-14 22:46:38 -0800 | [diff] [blame] | 52 | // The format of bsdiff we're using. |
| 53 | BsdiffFormat format_; |
| 54 | |
Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [diff] [blame] | 55 | // The three internal compressed streams. |
Tianjie Xu | 1c26e2e | 2017-10-26 17:19:41 -0700 | [diff] [blame] | 56 | std::unique_ptr<CompressorInterface> ctrl_stream_{nullptr}; |
| 57 | std::unique_ptr<CompressorInterface> diff_stream_{nullptr}; |
| 58 | std::unique_ptr<CompressorInterface> extra_stream_{nullptr}; |
Alex Deymo | a28e019 | 2017-09-08 14:21:05 +0200 | [diff] [blame] | 59 | }; |
| 60 | |
| 61 | } // namespace bsdiff |
| 62 | |
| 63 | #endif // _BSDIFF_PATCH_WRITER_H_ |