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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>
*/
#include "bspatch.h"
#include "errors.h"
#include <sys/stat.h>
#include <stdlib.h>
#include <stdio.h>
#include <fcntl.h>
#include <string.h>
#include <limits.h>
#if defined(XP_WIN)
# include <io.h>
#else
# include <unistd.h>
#endif
#ifdef XP_WIN
# include <winsock2.h>
#else
# include <arpa/inet.h>
#endif
#ifndef SSIZE_MAX
# define SSIZE_MAX LONG_MAX
#endif
int
MBS_ReadHeader(FILE* file, MBSPatchHeader *header)
{
size_t s = fread(header, 1, sizeof(MBSPatchHeader), file);
if (s != sizeof(MBSPatchHeader))
return READ_ERROR;
header->slen = ntohl(header->slen);
header->scrc32 = ntohl(header->scrc32);
header->dlen = ntohl(header->dlen);
header->cblen = ntohl(header->cblen);
header->difflen = ntohl(header->difflen);
header->extralen = ntohl(header->extralen);
struct stat hs;
s = fstat(fileno(file), &hs);
if (s)
return READ_ERROR;
if (memcmp(header->tag, "MBDIFF10", 8) != 0)
return UNEXPECTED_BSPATCH_ERROR;
if (sizeof(MBSPatchHeader) +
header->cblen +
header->difflen +
header->extralen != uint32_t(hs.st_size))
return UNEXPECTED_BSPATCH_ERROR;
return OK;
}
int
MBS_ApplyPatch(const MBSPatchHeader *header, FILE* patchFile,
unsigned char *fbuffer, FILE* file)
{
unsigned char *fbufend = fbuffer + header->slen;
unsigned char *buf = (unsigned char*) malloc(header->cblen +
header->difflen +
header->extralen);
if (!buf)
return BSPATCH_MEM_ERROR;
int rv = OK;
size_t r = header->cblen + header->difflen + header->extralen;
unsigned char *wb = buf;
while (r) {
const size_t count = (r > SSIZE_MAX) ? SSIZE_MAX : r;
size_t c = fread(wb, 1, count, patchFile);
if (c != count) {
rv = READ_ERROR;
goto end;
}
r -= c;
wb += c;
}
{
MBSPatchTriple *ctrlsrc = (MBSPatchTriple*) buf;
unsigned char *diffsrc = buf + header->cblen;
unsigned char *extrasrc = diffsrc + header->difflen;
MBSPatchTriple *ctrlend = (MBSPatchTriple*) diffsrc;
unsigned char *diffend = extrasrc;
unsigned char *extraend = extrasrc + header->extralen;
do {
ctrlsrc->x = ntohl(ctrlsrc->x);
ctrlsrc->y = ntohl(ctrlsrc->y);
ctrlsrc->z = ntohl(ctrlsrc->z);
#ifdef DEBUG_bsmedberg
printf("Applying block:\n"
" x: %u\n"
" y: %u\n"
" z: %i\n",
ctrlsrc->x,
ctrlsrc->y,
ctrlsrc->z);
#endif
/* Add x bytes from oldfile to x bytes from the diff block */
if (fbuffer + ctrlsrc->x > fbufend ||
diffsrc + ctrlsrc->x > diffend) {
rv = UNEXPECTED_BSPATCH_ERROR;
goto end;
}
for (uint32_t i = 0; i < ctrlsrc->x; ++i) {
diffsrc[i] += fbuffer[i];
}
if ((uint32_t) fwrite(diffsrc, 1, ctrlsrc->x, file) != ctrlsrc->x) {
rv = WRITE_ERROR_PATCH_FILE;
goto end;
}
fbuffer += ctrlsrc->x;
diffsrc += ctrlsrc->x;
/* Copy y bytes from the extra block */
if (extrasrc + ctrlsrc->y > extraend) {
rv = UNEXPECTED_BSPATCH_ERROR;
goto end;
}
if ((uint32_t) fwrite(extrasrc, 1, ctrlsrc->y, file) != ctrlsrc->y) {
rv = WRITE_ERROR_PATCH_FILE;
goto end;
}
extrasrc += ctrlsrc->y;
/* "seek" forwards in oldfile by z bytes */
if (fbuffer + ctrlsrc->z > fbufend) {
rv = UNEXPECTED_BSPATCH_ERROR;
goto end;
}
fbuffer += ctrlsrc->z;
/* and on to the next control block */
++ctrlsrc;
} while (ctrlsrc < ctrlend);
}
end:
free(buf);
return rv;
}
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