| /*- |
| * 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__ |
| |
| #define OK 0 |
| #define MEM_ERROR 1 |
| // #define IO_ERROR 2 // Use READ_ERROR or WRITE_ERROR instead |
| #define USAGE_ERROR 3 |
| #define CRC_ERROR 4 |
| #define PARSE_ERROR 5 |
| #define READ_ERROR 6 |
| #define WRITE_ERROR 7 |
| #define UNEXPECTED_ERROR 8 |
| |
| typedef struct MBSPatchHeader_ { |
| /* "MBDIFF10" */ |
| char tag[8]; |
| |
| /* Length of the file to be patched */ |
| unsigned int slen; |
| |
| /* CRC32 of the file to be patched */ |
| unsigned int scrc32; |
| |
| /* Length of the result file */ |
| unsigned int dlen; |
| |
| /* Length of the control block in bytes */ |
| unsigned int cblen; |
| |
| /* Length of the diff block in bytes */ |
| unsigned int difflen; |
| |
| /* Length of the extra block in bytes */ |
| unsigned int 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(int fd, 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, int patchfd, |
| unsigned char *fbuffer, int filefd); |
| |
| typedef struct MBSPatchTriple_ { |
| unsigned int x; /* add x bytes from oldfile to x bytes from the diff block */ |
| unsigned int y; /* copy y bytes from the extra block */ |
| int z; /* seek forwards in oldfile by z bytes */ |
| } MBSPatchTriple; |
| |
| /** |
| * Apply the given patch file to a given source file. This method validates |
| * the CRC of the original file stored in the patch file, before applying the |
| * patch to it. |
| */ |
| int ApplyBinaryPatch(const wchar_t *old_file, const wchar_t *patch_file, |
| const wchar_t *new_file); |
| |
| /** |
| * Calculates Crc of the given buffer by calling CRC method in LZMA SDK |
| */ |
| int CalculateCrc(const unsigned char *buf, int size); |
| #endif // bspatch_h__ |