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/*

* Copyright (C) the libgit2 contributors. All rights reserved.

*

* This file is part of libgit2, distributed under the GNU GPL v2 with

* a Linking Exception. For full terms see the included COPYING file.

*/

#ifndef INCLUDE_delta_apply_h__

#define INCLUDE_delta_apply_h__

#include "odb.h"

/**

* Apply a git binary delta to recover the original content.

*

* @param out the output buffer to receive the original data.

* Only out->data and out->len are populated, as this is

* the only information available in the delta.

* @param base the base to copy from during copy instructions.

* @param base_len number of bytes available at base.

* @param delta the delta to execute copy/insert instructions from.

* @param delta_len total number of bytes in the delta.

* @return

* - 0 on a successful delta unpack.

* - GIT_ERROR if the delta is corrupt or doesn't match the base.

*/

extern int git__delta_apply(

git_rawobj *out,

const unsigned char *base,

size_t base_len,

const unsigned char *delta,

size_t delta_len);

/**

* Read the header of a git binary delta.

*

* @param delta the delta to execute copy/insert instructions from.

* @param delta_len total number of bytes in the delta.

* @param base_sz pointer to store the base size field.

* @param res_sz pointer to store the result size field.

* @return

* - 0 on a successful decoding the header.

* - GIT_ERROR if the delta is corrupt.

*/

extern int git__delta_read_header(

const unsigned char *delta,

size_t delta_len,

size_t *base_sz,

size_t *res_sz);

#endif