60 lines
2.5 KiB
C++
60 lines
2.5 KiB
C++
//
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// Copyright (C) 2021 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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#ifndef UPDATE_ENGINE_LZ4DIFF_LZ4DIFF_COMPRESS_H_
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#define UPDATE_ENGINE_LZ4DIFF_LZ4DIFF_COMPRESS_H_
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#include "lz4diff_format.h"
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#include <string_view>
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namespace chromeos_update_engine {
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using SinkFunc = std::function<size_t(const uint8_t*, size_t)>;
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// |TryCompressBlob| and |TryDecompressBlob| are inverse function of each other.
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// One compresses data into fixed size output chunks, one decompresses fixed
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// size blocks.
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// The |TryCompressBlob| routine is supposed to mimic how EROFS compresses input
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// files when creating an EROFS image. After calling |TryCompressBlob|, LZ4DIFF
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// will compare the re-compressed blob and EROFS's ground truth blob, and
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// generate a BSDIFF patch between them if there's mismatch. Therefore, it is OK
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// that |TryCompressBlob| produces slightly different output than mkfs.erofs, so
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// as long as |TryCompressBlob| exhibits consistne bebavior across platforms.
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Blob TryCompressBlob(std::string_view blob,
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const std::vector<CompressedBlock>& block_info,
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const bool zero_padding_enabled,
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const CompressionAlgorithm compression_algo);
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bool TryCompressBlob(std::string_view blob,
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const std::vector<CompressedBlock>& block_info,
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const bool zero_padding_enabled,
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const CompressionAlgorithm compression_algo,
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const SinkFunc& sink);
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Blob TryDecompressBlob(std::string_view blob,
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const std::vector<CompressedBlock>& block_info,
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const bool zero_padding_enabled);
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Blob TryDecompressBlob(const Blob& blob,
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const std::vector<CompressedBlock>& block_info,
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const bool zero_padding_enabled);
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std::ostream& operator<<(std::ostream& out, const CompressedBlockInfo& info);
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std::ostream& operator<<(std::ostream& out, const CompressedBlock& block);
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} // namespace chromeos_update_engine
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#endif
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