/*
* 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
