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// Copyright 2017 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef SRC_INCLUDE_PUFFIN_PUFFDIFF_H_
#define SRC_INCLUDE_PUFFIN_PUFFDIFF_H_
#include <string>
#include <vector>
#include "bsdiff/constants.h"
#include "puffin/common.h"
#include "puffin/stream.h"
namespace puffin {
enum class PatchAlgorithm {
kBsdiff = 0,
kZucchini = 1,
};
// Performs a diff operation between input deflate streams and creates a patch
// that is used in the client to recreate the |dst| from |src|.
// |src| IN Source deflate stream.
// |dst| IN Destination deflate stream.
// |src_deflates| IN Deflate locations in |src|.
// |dst_deflates| IN Deflate locations in |dst|.
// |compressors| IN Compressors to use in the underlying bsdiff, e.g.
// bz2,
// brotli.
// |patchAlgorithm| IN The patchAlgorithm used to create patches between
// uncompressed bytes, e.g. bsdiff, zucchini.
// |tmp_filepath| IN A path to a temporary file. The caller has the
// responsibility of unlinking the file after the call to
// |PuffDiff| finishes.
// |puffin_patch| OUT The patch that later can be used in |PuffPatch|.
bool PuffDiff(UniqueStreamPtr src,
UniqueStreamPtr dst,
const std::vector<BitExtent>& src_deflates,
const std::vector<BitExtent>& dst_deflates,
const std::vector<bsdiff::CompressorType>& compressors,
PatchAlgorithm patchAlgorithm,
const std::string& tmp_filepath,
Buffer* patch);
// This function uses bsdiff as the patch algorithm.
bool PuffDiff(UniqueStreamPtr src,
UniqueStreamPtr dst,
const std::vector<BitExtent>& src_deflates,
const std::vector<BitExtent>& dst_deflates,
const std::vector<bsdiff::CompressorType>& compressors,
const std::string& tmp_filepath,
Buffer* patch);
// Similar to the function above, except that it accepts raw buffer rather than
// stream.
bool PuffDiff(const Buffer& src,
const Buffer& dst,
const std::vector<BitExtent>& src_deflates,
const std::vector<BitExtent>& dst_deflates,
const std::vector<bsdiff::CompressorType>& compressors,
const std::string& tmp_filepath,
Buffer* patch);
// The default puffdiff function that uses both bz2 and brotli to compress the
// patch data.
bool PuffDiff(const Buffer& src,
const Buffer& dst,
const std::vector<BitExtent>& src_deflates,
const std::vector<BitExtent>& dst_deflates,
const std::string& tmp_filepath,
Buffer* patch);
} // namespace puffin
#endif // SRC_INCLUDE_PUFFIN_PUFFDIFF_H_
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