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