// 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_WRITER_INTERFACE_H_
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#define _BSDIFF_PATCH_WRITER_INTERFACE_H_
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#include <stddef.h>
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#include <stdint.h>
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#include "bsdiff/control_entry.h"
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namespace bsdiff {
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enum class BsdiffFormat {
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kLegacy,
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kBsdf2,
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kEndsley,
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};
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class PatchWriterInterface {
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public:
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virtual ~PatchWriterInterface() = default;
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// Initialize the patch writer for a patch where the new file will have
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// |new_size| bytes.
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virtual bool Init(size_t new_size) = 0;
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// Write the passed |data| buffer of length |size| to the Diff or Extra
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// streams respectively. Each method can be called independently from each
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// other and calls don't need to be a correlation with the AddControlEntry()
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// until Close() is called.
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virtual bool WriteDiffStream(const uint8_t* data, size_t size) = 0;
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virtual bool WriteExtraStream(const uint8_t* data, size_t size) = 0;
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// Add a new control triplet entry to the patch. These triplets may be added
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// at any point before calling Close(), regardless of whether the
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// corresponding WriteDiffStream() and WriteExtraStream() have been called
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// yet.
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virtual bool AddControlEntry(const ControlEntry& entry) = 0;
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// Finalize the patch writing process and close the file.
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virtual bool Close() = 0;
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protected:
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PatchWriterInterface() = default;
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};
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} // namespace bsdiff
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#endif // _BSDIFF_PATCH_WRITER_INTERFACE_H_
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