223 lines
6.2 KiB
C
223 lines
6.2 KiB
C
/*-
|
|
* Copyright 2003-2005 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.
|
|
*/
|
|
|
|
#if 0
|
|
__FBSDID("$FreeBSD: src/usr.bin/bsdiff/bspatch/bspatch.c,v 1.1 2005/08/06 01:59:06 cperciva Exp $");
|
|
#endif
|
|
|
|
#include <bzlib.h>
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <unistd.h>
|
|
#include <fcntl.h>
|
|
|
|
static off_t offtin(u_char *buf)
|
|
{
|
|
off_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;
|
|
}
|
|
|
|
|
|
void writeFull(const char * name, int fd,
|
|
const unsigned char * buf, size_t count)
|
|
{
|
|
while (count) {
|
|
ssize_t res = write(fd, (char *) buf, count);
|
|
if (res == -1) {
|
|
if (errno == EINTR) continue;
|
|
err(1,"writing to %s",name);
|
|
}
|
|
count -= res;
|
|
buf += res;
|
|
}
|
|
}
|
|
|
|
|
|
int main(int argc,char * argv[])
|
|
{
|
|
FILE * f, * cpf, * dpf, * epf;
|
|
BZFILE * cpfbz2, * dpfbz2, * epfbz2;
|
|
int cbz2err, dbz2err, ebz2err;
|
|
int fd;
|
|
ssize_t oldsize,newsize;
|
|
ssize_t bzctrllen,bzdatalen;
|
|
u_char header[32],buf[8];
|
|
u_char *old, *new;
|
|
off_t oldpos,newpos;
|
|
off_t ctrl[3];
|
|
off_t lenread;
|
|
off_t i;
|
|
|
|
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]);
|
|
|
|
/*
|
|
File format:
|
|
0 8 "BSDIFF40"
|
|
8 8 X
|
|
16 8 Y
|
|
24 8 sizeof(newfile)
|
|
32 X bzip2(control block)
|
|
32+X Y bzip2(diff block)
|
|
32+X+Y ??? bzip2(extra block)
|
|
with control block a set of triples (x,y,z) meaning "add x bytes
|
|
from oldfile to x bytes from the diff block; copy y bytes from the
|
|
extra block; seek forwards in oldfile by z bytes".
|
|
*/
|
|
|
|
/* Read header */
|
|
if (fread(header, 1, 32, f) < 32) {
|
|
if (feof(f))
|
|
errx(1, "Corrupt patch\n");
|
|
err(1, "fread(%s)", argv[3]);
|
|
}
|
|
|
|
/* Check for appropriate magic */
|
|
if (memcmp(header, "BSDIFF40", 8) != 0)
|
|
errx(1, "Corrupt patch\n");
|
|
|
|
/* Read lengths from header */
|
|
bzctrllen=offtin(header+8);
|
|
bzdatalen=offtin(header+16);
|
|
newsize=offtin(header+24);
|
|
if((bzctrllen<0) || (bzdatalen<0) || (newsize<0))
|
|
errx(1,"Corrupt patch\n");
|
|
|
|
/* Close patch file and re-open it via libbzip2 at the right places */
|
|
if (fclose(f))
|
|
err(1, "fclose(%s)", argv[3]);
|
|
if ((cpf = fopen(argv[3], "r")) == NULL)
|
|
err(1, "fopen(%s)", argv[3]);
|
|
if (fseeko(cpf, 32, SEEK_SET))
|
|
err(1, "fseeko(%s, %lld)", argv[3],
|
|
(long long)32);
|
|
if ((cpfbz2 = BZ2_bzReadOpen(&cbz2err, cpf, 0, 0, NULL, 0)) == NULL)
|
|
errx(1, "BZ2_bzReadOpen, bz2err = %d", cbz2err);
|
|
if ((dpf = fopen(argv[3], "r")) == NULL)
|
|
err(1, "fopen(%s)", argv[3]);
|
|
if (fseeko(dpf, 32 + bzctrllen, SEEK_SET))
|
|
err(1, "fseeko(%s, %lld)", argv[3],
|
|
(long long)(32 + bzctrllen));
|
|
if ((dpfbz2 = BZ2_bzReadOpen(&dbz2err, dpf, 0, 0, NULL, 0)) == NULL)
|
|
errx(1, "BZ2_bzReadOpen, bz2err = %d", dbz2err);
|
|
if ((epf = fopen(argv[3], "r")) == NULL)
|
|
err(1, "fopen(%s)", argv[3]);
|
|
if (fseeko(epf, 32 + bzctrllen + bzdatalen, SEEK_SET))
|
|
err(1, "fseeko(%s, %lld)", argv[3],
|
|
(long long)(32 + bzctrllen + bzdatalen));
|
|
if ((epfbz2 = BZ2_bzReadOpen(&ebz2err, epf, 0, 0, NULL, 0)) == NULL)
|
|
errx(1, "BZ2_bzReadOpen, bz2err = %d", ebz2err);
|
|
|
|
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) ||
|
|
(close(fd)==-1)) err(1,"%s",argv[1]);
|
|
if((new=malloc(newsize+1))==NULL) err(1,NULL);
|
|
|
|
oldpos=0;newpos=0;
|
|
while(newpos<newsize) {
|
|
/* Read control data */
|
|
for(i=0;i<=2;i++) {
|
|
lenread = BZ2_bzRead(&cbz2err, cpfbz2, buf, 8);
|
|
if ((lenread < 8) || ((cbz2err != BZ_OK) &&
|
|
(cbz2err != BZ_STREAM_END)))
|
|
errx(1, "Corrupt patch\n");
|
|
ctrl[i]=offtin(buf);
|
|
};
|
|
|
|
/* Sanity-check */
|
|
if(newpos+ctrl[0]>newsize)
|
|
errx(1,"Corrupt patch\n");
|
|
|
|
/* Read diff string */
|
|
lenread = BZ2_bzRead(&dbz2err, dpfbz2, new + newpos, ctrl[0]);
|
|
if ((lenread < ctrl[0]) ||
|
|
((dbz2err != BZ_OK) && (dbz2err != BZ_STREAM_END)))
|
|
errx(1, "Corrupt patch\n");
|
|
|
|
/* 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)
|
|
errx(1,"Corrupt patch\n");
|
|
|
|
/* Read extra string */
|
|
lenread = BZ2_bzRead(&ebz2err, epfbz2, new + newpos, ctrl[1]);
|
|
if ((lenread < ctrl[1]) ||
|
|
((ebz2err != BZ_OK) && (ebz2err != BZ_STREAM_END)))
|
|
errx(1, "Corrupt patch\n");
|
|
|
|
/* Adjust pointers */
|
|
newpos+=ctrl[1];
|
|
oldpos+=ctrl[2];
|
|
};
|
|
|
|
/* Clean up the bzip2 reads */
|
|
BZ2_bzReadClose(&cbz2err, cpfbz2);
|
|
BZ2_bzReadClose(&dbz2err, dpfbz2);
|
|
BZ2_bzReadClose(&ebz2err, epfbz2);
|
|
if (fclose(cpf) || fclose(dpf) || fclose(epf))
|
|
err(1, "fclose(%s)", argv[3]);
|
|
|
|
/* Write the new file */
|
|
if((fd=open(argv[2],O_CREAT|O_TRUNC|O_WRONLY,0666))<0)
|
|
err(1,"%s",argv[2]);
|
|
writeFull(argv[2], fd, new, newsize);
|
|
if(close(fd)==-1)
|
|
err(1,"%s",argv[2]);
|
|
|
|
free(new);
|
|
free(old);
|
|
|
|
return 0;
|
|
}
|