bspatch.h

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/*-
 * Copyright 2003,2004 Colin Percival
 * All rights reserved
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted providing that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
 * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 * Changelog:
 * 2005-04-26 - Define the header as a C structure, add a CRC32 checksum to
 *              the header, and make all the types 32-bit.
 *                --Benjamin Smedberg <benjamin@smedbergs.us>
 */
 
#ifndef bspatch_h__
#define bspatch_h__
 
#include <stdint.h>
#include <stdio.h>
 
typedef struct MBSPatchHeader_
{
    /* "MBDIFF10" */
    char tag[8];
 
    /* Length of the file to be patched */
    uint32_t slen;
 
    /* CRC32 of the file to be patched */
    uint32_t scrc32;
 
    /* Length of the result file */
    uint32_t dlen;
 
    /* Length of the control block in bytes */
    uint32_t cblen;
 
    /* Length of the diff block in bytes */
    uint32_t difflen;
 
    /* Length of the extra block in bytes */
    uint32_t extralen;
 
    /* Control block (MBSPatchTriple[]) */
    /* Diff block (binary data) */
    /* Extra block (binary data) */
} MBSPatchHeader;
 
int MBS_ReadHeader(FILE* file, MBSPatchHeader* header);
 
int MBS_ApplyPatch(const MBSPatchHeader* header, FILE* patchFile, unsigned char* fbuffer,
                   FILE* file);
 
typedef struct MBSPatchTriple_
{
    uint32_t x; /* add x bytes from oldfile to x bytes from the diff block */
    uint32_t y; /* copy y bytes from the extra block */
    int32_t z; /* seek forwards in oldfile by z bytes */
} MBSPatchTriple;
 
#endif // bspatch_h__