#if 0
__FBSDID("$FreeBSD: src/usr.bin/bsdiff/bspatch/bspatch.c,v 1.1 2005/08/06 01:59:06 cperciva Exp $");
#endif
#include <bspatch.h>
#include <bzlib.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <err.h>
#include <unistd.h>
#include <fcntl.h>
typedef void* stream_t;
typedef struct
{
stream_t (*open)(FILE*);
void (*close)(stream_t);
int (*read)(stream_t, void*, int);
} io_funcs_t;
static stream_t BSDIFF40_open(FILE *f)
{
int bzerr;
BZFILE *s;
if ((s = BZ2_bzReadOpen(&bzerr, f, 0, 0, NULL, 0)) == NULL)
errx(1, "BZ2_bzReadOpen, bz2err = %d", bzerr);
return s;
}
static void BSDIFF40_close(stream_t s)
{
int bzerr;
BZ2_bzReadClose(&bzerr, (BZFILE*)s);
}
static int BSDIFF40_read(stream_t s, void *buf, int len)
{
int bzerr, lenread;
lenread = BZ2_bzRead(&bzerr, (BZFILE*)s, buf, len);
if (bzerr != BZ_OK && bzerr != BZ_STREAM_END)
errx(1, "Corrupt patch\n");
return lenread;
}
static io_funcs_t BSDIFF40_funcs = {
BSDIFF40_open,
BSDIFF40_close,
BSDIFF40_read
};
static stream_t BSDIFN40_open(FILE *f)
{
return f;
}
static void BSDIFN40_close(stream_t s)
{
}
static int BSDIFN40_read(stream_t s, void *buf, int len)
{
return fread(buf, 1, len, (FILE*)s);
}
static io_funcs_t BSDIFN40_funcs = {
BSDIFN40_open,
BSDIFN40_close,
BSDIFN40_read
};
#ifndef u_char
typedef unsigned char u_char;
#endif
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 bspatch(int argc,char * argv[])
{
FILE * f, * cpf, * dpf, * epf;
stream_t cstream, dstream, estream;
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;
io_funcs_t * io;
if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]);
if ((f = fopen(argv[3], "r")) == NULL)
err(1, "fopen(%s)", argv[3]);
if (fread(header, 1, 32, f) < 32) {
if (feof(f))
errx(1, "Corrupt patch\n");
err(1, "fread(%s)", argv[3]);
}
if (memcmp(header, "BSDIFF40", 8) == 0)
io = &BSDIFF40_funcs;
else if (memcmp(header, "BSDIFN40", 8) == 0)
io = &BSDIFN40_funcs;
else
errx(1, "Corrupt patch\n");
bzctrllen=offtin(header+8);
bzdatalen=offtin(header+16);
newsize=offtin(header+24);
if((bzctrllen<0) || (bzdatalen<0) || (newsize<0))
errx(1,"Corrupt patch\n");
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);
cstream = io->open(cpf);
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));
dstream = io->open(dpf);
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));
estream = io->open(epf);
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) {
for(i=0;i<=2;i++) {
lenread = io->read(cstream, buf, 8);
if (lenread < 8)
errx(1, "Corrupt patch\n");
ctrl[i]=offtin(buf);
};
if(newpos+ctrl[0]>newsize)
errx(1,"Corrupt patch\n");
lenread = io->read(dstream, new + newpos, ctrl[0]);
if (lenread < ctrl[0])
errx(1, "Corrupt patch\n");
for(i=0;i<ctrl[0];i++)
if((oldpos+i>=0) && (oldpos+i<oldsize))
new[newpos+i]+=old[oldpos+i];
newpos+=ctrl[0];
oldpos+=ctrl[0];
if(newpos+ctrl[1]>newsize)
errx(1,"Corrupt patch\n");
lenread = io->read(estream, new + newpos, ctrl[1]);
if (lenread < ctrl[1])
errx(1, "Corrupt patch\n");
newpos+=ctrl[1];
oldpos+=ctrl[2];
};
io->close(cstream);
io->close(dstream);
io->close(estream);
if (fclose(cpf) || fclose(dpf) || fclose(epf))
err(1, "fclose(%s)", argv[3]);
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;
}