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/*-
* Copyright 2003-2005 Colin Percival
* Copyright 2012 Matthew Endsley
* 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.
*/
#include <limits.h>
#include "bspatch.h"
static int64_t offtin(uint8_t *buf)
{
int64_t y;
y=buf[7]&0x7F;
y=y*256;y+=buf[6];
y=y*256;y+=buf[5];
y=y*256;y+=buf[4];
y=y*256;y+=buf[3];
y=y*256;y+=buf[2];
y=y*256;y+=buf[1];
y=y*256;y+=buf[0];
if(buf[7]&0x80) y=-y;
return y;
}
int bspatch(const uint8_t* old, int64_t oldsize, uint8_t* new, int64_t newsize, struct bspatch_stream* stream)
{
uint8_t buf[8];
int64_t oldpos,newpos;
int64_t ctrl[3];
int64_t i;
oldpos=0;newpos=0;
while(newpos<newsize) {
/* Read control data */
for(i=0;i<=2;i++) {
if (stream->read(stream, buf, 8))
return -1;
ctrl[i]=offtin(buf);
};
/* Sanity-check */
if (ctrl[0]<0 || ctrl[0]>INT_MAX ||
ctrl[1]<0 || ctrl[1]>INT_MAX ||
newpos+ctrl[0]>newsize)
return -1;
/* Read diff string */
if (stream->read(stream, new + newpos, ctrl[0]))
return -1;
/* Add old data to diff string */
for(i=0;i<ctrl[0];i++)
if((oldpos+i>=0) && (oldpos+i<oldsize))
new[newpos+i]+=old[oldpos+i];
/* Adjust pointers */
newpos+=ctrl[0];
oldpos+=ctrl[0];
/* Sanity-check */
if(newpos+ctrl[1]>newsize)
return -1;
/* Read extra string */
if (stream->read(stream, new + newpos, ctrl[1]))
return -1;
/* Adjust pointers */
newpos+=ctrl[1];
oldpos+=ctrl[2];
};
return 0;
}
#if defined(BSPATCH_EXECUTABLE)
#include <bzlib.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <err.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
static int bz2_read(const struct bspatch_stream* stream, void* buffer, int length)
{
int n;
int bz2err;
BZFILE* bz2;
bz2 = (BZFILE*)stream->opaque;
n = BZ2_bzRead(&bz2err, bz2, buffer, length);
if (n != length)
return -1;
return 0;
}
int main(int argc,char * argv[])
{
FILE * f;
int fd;
int bz2err;
uint8_t header[24];
uint8_t *old, *new;
int64_t oldsize, newsize;
BZFILE* bz2;
struct bspatch_stream stream;
struct stat sb;
if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]);
/* Open patch file */
if ((f = fopen(argv[3], "r")) == NULL)
err(1, "fopen(%s)", argv[3]);
/* Read header */
if (fread(header, 1, 24, f) != 24) {
if (feof(f))
errx(1, "Corrupt patch\n");
err(1, "fread(%s)", argv[3]);
}
/* Check for appropriate magic */
if (memcmp(header, "ENDSLEY/BSDIFF43", 16) != 0)
errx(1, "Corrupt patch\n");
/* Read lengths from header */
newsize=offtin(header+16);
if(newsize<0)
errx(1,"Corrupt patch\n");
/* Close patch file and re-open it via libbzip2 at the right places */
if(((fd=open(argv[1],O_RDONLY,0))<0) ||
((oldsize=lseek(fd,0,SEEK_END))==-1) ||
((old=malloc(oldsize+1))==NULL) ||
(lseek(fd,0,SEEK_SET)!=0) ||
(read(fd,old,oldsize)!=oldsize) ||
(fstat(fd, &sb)) ||
(close(fd)==-1)) err(1,"%s",argv[1]);
if((new=malloc(newsize+1))==NULL) err(1,NULL);
if (NULL == (bz2 = BZ2_bzReadOpen(&bz2err, f, 0, 0, NULL, 0)))
errx(1, "BZ2_bzReadOpen, bz2err=%d", bz2err);
stream.read = bz2_read;
stream.opaque = bz2;
if (bspatch(old, oldsize, new, newsize, &stream))
errx(1, "bspatch");
/* Clean up the bzip2 reads */
BZ2_bzReadClose(&bz2err, bz2);
fclose(f);
/* Write the new file */
if(((fd=open(argv[2],O_CREAT|O_TRUNC|O_WRONLY,sb.st_mode))<0) ||
(write(fd,new,newsize)!=newsize) || (close(fd)==-1))
err(1,"%s",argv[2]);
free(new);
free(old);
return 0;
}
#endif
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