0,0 → 1,204 |
/*- |
* 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 <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; |
} |
|
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) || |
(write(fd,new,newsize)!=newsize) || (close(fd)==-1)) |
err(1,"%s",argv[2]); |
|
free(new); |
free(old); |
|
return 0; |
} |