Source code
Revision control
Copy as Markdown
Other Tools
/*-
* 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;
/**
* Read the header of a patch file into the MBSPatchHeader structure.
*
* @param fd Must have been opened for reading, and be at the beginning
* of the file.
*/
int MBS_ReadHeader(FILE* file, MBSPatchHeader* header);
/**
* Apply a patch. This method does not validate the checksum of the original
* file: client code should validate the checksum before calling this method.
*
* @param patchfd Must have been processed by MBS_ReadHeader
* @param fbuffer The original file read into a memory buffer of length
* header->slen.
* @param filefd Must have been opened for writing. Should be truncated
* to header->dlen if it is an existing file. The offset
* should be at the beginning of the file.
*/
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__