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67 lines
2.2 KiB
67 lines
2.2 KiB
4 months ago
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// Copyright 2017 The Chromium OS Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef _BSDIFF_PATCH_READER_H_
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#define _BSDIFF_PATCH_READER_H_
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#include <stddef.h>
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#include <stdint.h>
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#include <memory>
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#include "bsdiff/control_entry.h"
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#include "bsdiff/decompressor_interface.h"
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#include "bsdiff/file_interface.h"
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namespace bsdiff {
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// A wrapper class to read and parse the data in a bsdiff patch. The reader
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// class contains the concatenated streams of control, diff, and extra data.
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// After initialization, this class provides the function to read the metadata
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// embedded in the control stream sequentially and decompresses the diff & extra
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// stream based on this metadata.
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class BsdiffPatchReader {
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public:
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BsdiffPatchReader() = default;
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// Initialize the control stream, diff stream and extra stream from the
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// corresponding offset of |patch_data|.
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bool Init(const uint8_t* patch_data, size_t patch_size);
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// Read the control stream and parse the metadata of |diff_size_|,
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// |extra_size_| and |offset_incremental_|.
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bool ParseControlEntry(ControlEntry* control_entry);
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// Read the data in |diff_stream_| and write |size| decompressed data to
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// |buf|.
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bool ReadDiffStream(uint8_t* buf, size_t size);
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// Read the data in |extra_stream_| and write |size| decompressed data to
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// |buf|.
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bool ReadExtraStream(uint8_t* buf, size_t size);
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uint64_t new_file_size() const { return new_file_size_; }
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// Close the control/diff/extra stream. Return false if errors occur when
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// closing any of these streams.
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bool Finish();
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private:
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// The compressed stream that contains the control data; i.e. length of each
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// diff/extra block and the corresponding offset to read in the source file.
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std::unique_ptr<DecompressorInterface> ctrl_stream_{nullptr};
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// The compressed stream that contains the concatenated diff blocks.
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std::unique_ptr<DecompressorInterface> diff_stream_{nullptr};
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// The compressed stream that contains the concatenated extra blocks.
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std::unique_ptr<DecompressorInterface> extra_stream_{nullptr};
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// Size of the target file.
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uint64_t new_file_size_;
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};
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} // namespace bsdiff
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#endif // _BSDIFF_PATCH_READER_H_
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