зеркало из https://github.com/mozilla/pjs.git
403 строки
8.8 KiB
C
403 строки
8.8 KiB
C
|
/* vim:set ts=8 sw=8 sts=8 noet: */
|
||
|
/*
|
||
|
bsdiff.c -- Binary patch generator.
|
||
|
|
||
|
Copyright 2003 Colin Percival
|
||
|
|
||
|
For the terms under which this work may be distributed, please see
|
||
|
the adjoining file "LICENSE".
|
||
|
|
||
|
ChangeLog:
|
||
|
2005-05-05 - Use the modified header struct from bspatch.h; use 32-bit
|
||
|
values throughout.
|
||
|
--Benjamin Smedberg <benjamin@smedbergs.us>
|
||
|
2005-05-18 - Use the same CRC algorithm as bzip2, and leverage the CRC table
|
||
|
provided by libbz2.
|
||
|
--Darin Fisher <darin@meer.net>
|
||
|
*/
|
||
|
|
||
|
#include "bspatch.h"
|
||
|
|
||
|
#include <stdlib.h>
|
||
|
#include <stdio.h>
|
||
|
#include <string.h>
|
||
|
#include <fcntl.h>
|
||
|
#include <stdarg.h>
|
||
|
#ifdef XP_WIN
|
||
|
#include <io.h>
|
||
|
#include <winsock2.h>
|
||
|
#else
|
||
|
#include <unistd.h>
|
||
|
#include <arpa/inet.h>
|
||
|
#define _O_BINARY 0
|
||
|
#endif
|
||
|
|
||
|
#undef MIN
|
||
|
#define MIN(x,y) (((x)<(y)) ? (x) : (y))
|
||
|
|
||
|
//-----------------------------------------------------------------------------
|
||
|
|
||
|
// This variable lives in libbz2. It's declared in bzlib_private.h, so we just
|
||
|
// declare it here to avoid including that entire header file.
|
||
|
extern unsigned int BZ2_crc32Table[256];
|
||
|
|
||
|
static unsigned int
|
||
|
crc32(const unsigned char *buf, unsigned int len)
|
||
|
{
|
||
|
unsigned int crc = 0xffffffffL;
|
||
|
|
||
|
const unsigned char *end = buf + len;
|
||
|
for (; buf != end; ++buf)
|
||
|
crc = (crc << 8) ^ BZ2_crc32Table[(crc >> 24) ^ *buf];
|
||
|
|
||
|
crc = ~crc;
|
||
|
return crc;
|
||
|
}
|
||
|
|
||
|
//-----------------------------------------------------------------------------
|
||
|
|
||
|
static void
|
||
|
reporterr(int e, const char *fmt, ...)
|
||
|
{
|
||
|
if (fmt) {
|
||
|
va_list args;
|
||
|
va_start(args, fmt);
|
||
|
vfprintf(stderr, fmt, args);
|
||
|
va_end(args);
|
||
|
}
|
||
|
|
||
|
exit(e);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
split(PROffset32 *I,PROffset32 *V,PROffset32 start,PROffset32 len,PROffset32 h)
|
||
|
{
|
||
|
PROffset32 i,j,k,x,tmp,jj,kk;
|
||
|
|
||
|
if(len<16) {
|
||
|
for(k=start;k<start+len;k+=j) {
|
||
|
j=1;x=V[I[k]+h];
|
||
|
for(i=1;k+i<start+len;i++) {
|
||
|
if(V[I[k+i]+h]<x) {
|
||
|
x=V[I[k+i]+h];
|
||
|
j=0;
|
||
|
};
|
||
|
if(V[I[k+i]+h]==x) {
|
||
|
tmp=I[k+j];I[k+j]=I[k+i];I[k+i]=tmp;
|
||
|
j++;
|
||
|
};
|
||
|
};
|
||
|
for(i=0;i<j;i++) V[I[k+i]]=k+j-1;
|
||
|
if(j==1) I[k]=-1;
|
||
|
};
|
||
|
return;
|
||
|
};
|
||
|
|
||
|
x=V[I[start+len/2]+h];
|
||
|
jj=0;kk=0;
|
||
|
for(i=start;i<start+len;i++) {
|
||
|
if(V[I[i]+h]<x) jj++;
|
||
|
if(V[I[i]+h]==x) kk++;
|
||
|
};
|
||
|
jj+=start;kk+=jj;
|
||
|
|
||
|
i=start;j=0;k=0;
|
||
|
while(i<jj) {
|
||
|
if(V[I[i]+h]<x) {
|
||
|
i++;
|
||
|
} else if(V[I[i]+h]==x) {
|
||
|
tmp=I[i];I[i]=I[jj+j];I[jj+j]=tmp;
|
||
|
j++;
|
||
|
} else {
|
||
|
tmp=I[i];I[i]=I[kk+k];I[kk+k]=tmp;
|
||
|
k++;
|
||
|
};
|
||
|
};
|
||
|
|
||
|
while(jj+j<kk) {
|
||
|
if(V[I[jj+j]+h]==x) {
|
||
|
j++;
|
||
|
} else {
|
||
|
tmp=I[jj+j];I[jj+j]=I[kk+k];I[kk+k]=tmp;
|
||
|
k++;
|
||
|
};
|
||
|
};
|
||
|
|
||
|
if(jj>start) split(I,V,start,jj-start,h);
|
||
|
|
||
|
for(i=0;i<kk-jj;i++) V[I[jj+i]]=kk-1;
|
||
|
if(jj==kk-1) I[jj]=-1;
|
||
|
|
||
|
if(start+len>kk) split(I,V,kk,start+len-kk,h);
|
||
|
}
|
||
|
|
||
|
static void
|
||
|
qsufsort(PROffset32 *I,PROffset32 *V,unsigned char *old,PROffset32 oldsize)
|
||
|
{
|
||
|
PROffset32 buckets[256];
|
||
|
PROffset32 i,h,len;
|
||
|
|
||
|
for(i=0;i<256;i++) buckets[i]=0;
|
||
|
for(i=0;i<oldsize;i++) buckets[old[i]]++;
|
||
|
for(i=1;i<256;i++) buckets[i]+=buckets[i-1];
|
||
|
for(i=255;i>0;i--) buckets[i]=buckets[i-1];
|
||
|
buckets[0]=0;
|
||
|
|
||
|
for(i=0;i<oldsize;i++) I[++buckets[old[i]]]=i;
|
||
|
I[0]=oldsize;
|
||
|
for(i=0;i<oldsize;i++) V[i]=buckets[old[i]];
|
||
|
V[oldsize]=0;
|
||
|
for(i=1;i<256;i++) if(buckets[i]==buckets[i-1]+1) I[buckets[i]]=-1;
|
||
|
I[0]=-1;
|
||
|
|
||
|
for(h=1;I[0]!=-(oldsize+1);h+=h) {
|
||
|
len=0;
|
||
|
for(i=0;i<oldsize+1;) {
|
||
|
if(I[i]<0) {
|
||
|
len-=I[i];
|
||
|
i-=I[i];
|
||
|
} else {
|
||
|
if(len) I[i-len]=-len;
|
||
|
len=V[I[i]]+1-i;
|
||
|
split(I,V,i,len,h);
|
||
|
i+=len;
|
||
|
len=0;
|
||
|
};
|
||
|
};
|
||
|
if(len) I[i-len]=-len;
|
||
|
};
|
||
|
|
||
|
for(i=0;i<oldsize+1;i++) I[V[i]]=i;
|
||
|
}
|
||
|
|
||
|
static PROffset32
|
||
|
matchlen(unsigned char *old,PROffset32 oldsize,unsigned char *newbuf,PROffset32 newsize)
|
||
|
{
|
||
|
PROffset32 i;
|
||
|
|
||
|
for(i=0;(i<oldsize)&&(i<newsize);i++)
|
||
|
if(old[i]!=newbuf[i]) break;
|
||
|
|
||
|
return i;
|
||
|
}
|
||
|
|
||
|
static PROffset32
|
||
|
search(PROffset32 *I,unsigned char *old,PROffset32 oldsize,
|
||
|
unsigned char *newbuf,PROffset32 newsize,PROffset32 st,PROffset32 en,PROffset32 *pos)
|
||
|
{
|
||
|
PROffset32 x,y;
|
||
|
|
||
|
if(en-st<2) {
|
||
|
x=matchlen(old+I[st],oldsize-I[st],newbuf,newsize);
|
||
|
y=matchlen(old+I[en],oldsize-I[en],newbuf,newsize);
|
||
|
|
||
|
if(x>y) {
|
||
|
*pos=I[st];
|
||
|
return x;
|
||
|
} else {
|
||
|
*pos=I[en];
|
||
|
return y;
|
||
|
}
|
||
|
};
|
||
|
|
||
|
x=st+(en-st)/2;
|
||
|
if(memcmp(old+I[x],newbuf,MIN(oldsize-I[x],newsize))<0) {
|
||
|
return search(I,old,oldsize,newbuf,newsize,x,en,pos);
|
||
|
} else {
|
||
|
return search(I,old,oldsize,newbuf,newsize,st,x,pos);
|
||
|
};
|
||
|
}
|
||
|
|
||
|
int main(int argc,char *argv[])
|
||
|
{
|
||
|
int fd;
|
||
|
unsigned char *old,*newbuf;
|
||
|
PROffset32 oldsize,newsize;
|
||
|
PROffset32 *I,*V;
|
||
|
|
||
|
PROffset32 scan,pos,len;
|
||
|
PROffset32 lastscan,lastpos,lastoffset;
|
||
|
PROffset32 oldscore,scsc;
|
||
|
|
||
|
PROffset32 s,Sf,lenf,Sb,lenb;
|
||
|
PROffset32 overlap,Ss,lens;
|
||
|
PROffset32 i;
|
||
|
|
||
|
PROffset32 dblen,eblen;
|
||
|
unsigned char *db,*eb;
|
||
|
|
||
|
unsigned int scrc;
|
||
|
|
||
|
MBSPatchHeader header = {
|
||
|
{'M','B','D','I','F','F','1','0'},
|
||
|
0, 0, 0, 0, 0, 0
|
||
|
};
|
||
|
|
||
|
PRUint32 numtriples;
|
||
|
|
||
|
if(argc!=4)
|
||
|
reporterr(1,"usage: %s <oldfile> <newfile> <patchfile>\n",argv[0]);
|
||
|
|
||
|
/* Allocate oldsize+1 bytes instead of oldsize bytes to ensure
|
||
|
that we never try to malloc(0) and get a NULL pointer */
|
||
|
if(((fd=open(argv[1],O_RDONLY|_O_BINARY,0))<0) ||
|
||
|
((oldsize=lseek(fd,0,SEEK_END))==-1) ||
|
||
|
((old=(unsigned char*) malloc(oldsize+1))==NULL) ||
|
||
|
(lseek(fd,0,SEEK_SET)!=0) ||
|
||
|
(read(fd,old,oldsize)!=oldsize) ||
|
||
|
(close(fd)==-1))
|
||
|
reporterr(1,"%s\n",argv[1]);
|
||
|
|
||
|
scrc = crc32(old, oldsize);
|
||
|
|
||
|
if(((I=(PROffset32*) malloc((oldsize+1)*sizeof(PROffset32)))==NULL) ||
|
||
|
((V=(PROffset32*) malloc((oldsize+1)*sizeof(PROffset32)))==NULL))
|
||
|
reporterr(1,NULL);
|
||
|
|
||
|
qsufsort(I,V,old,oldsize);
|
||
|
|
||
|
free(V);
|
||
|
|
||
|
/* Allocate newsize+1 bytes instead of newsize bytes to ensure
|
||
|
that we never try to malloc(0) and get a NULL pointer */
|
||
|
if(((fd=open(argv[2],O_RDONLY|_O_BINARY,0))<0) ||
|
||
|
((newsize=lseek(fd,0,SEEK_END))==-1) ||
|
||
|
((newbuf=(unsigned char*) malloc(newsize+1))==NULL) ||
|
||
|
(lseek(fd,0,SEEK_SET)!=0) ||
|
||
|
(read(fd,newbuf,newsize)!=newsize) ||
|
||
|
(close(fd)==-1)) reporterr(1,"%s\n",argv[2]);
|
||
|
|
||
|
if(((db=(unsigned char*) malloc(newsize+1))==NULL) ||
|
||
|
((eb=(unsigned char*) malloc(newsize+1))==NULL))
|
||
|
reporterr(1,NULL);
|
||
|
|
||
|
dblen=0;
|
||
|
eblen=0;
|
||
|
|
||
|
if((fd=open(argv[3],O_CREAT|O_TRUNC|O_WRONLY|_O_BINARY,0666))<0)
|
||
|
reporterr(1,"%s\n",argv[3]);
|
||
|
|
||
|
/* start writing here */
|
||
|
|
||
|
/* We don't know the lengths yet, so we will write the header again
|
||
|
at the end */
|
||
|
|
||
|
if(write(fd,&header,sizeof(MBSPatchHeader))!=sizeof(MBSPatchHeader))
|
||
|
reporterr(1,"%s\n",argv[3]);
|
||
|
|
||
|
scan=0;len=0;
|
||
|
lastscan=0;lastpos=0;lastoffset=0;
|
||
|
numtriples = 0;
|
||
|
while(scan<newsize) {
|
||
|
oldscore=0;
|
||
|
|
||
|
for(scsc=scan+=len;scan<newsize;scan++) {
|
||
|
len=search(I,old,oldsize,newbuf+scan,newsize-scan,
|
||
|
0,oldsize,&pos);
|
||
|
|
||
|
for(;scsc<scan+len;scsc++)
|
||
|
if((scsc+lastoffset<oldsize) &&
|
||
|
(old[scsc+lastoffset] == newbuf[scsc]))
|
||
|
oldscore++;
|
||
|
|
||
|
if(((len==oldscore) && (len!=0)) ||
|
||
|
(len>oldscore+8)) break;
|
||
|
|
||
|
if((scan+lastoffset<oldsize) &&
|
||
|
(old[scan+lastoffset] == newbuf[scan]))
|
||
|
oldscore--;
|
||
|
};
|
||
|
|
||
|
if((len!=oldscore) || (scan==newsize)) {
|
||
|
MBSPatchTriple triple;
|
||
|
|
||
|
s=0;Sf=0;lenf=0;
|
||
|
for(i=0;(lastscan+i<scan)&&(lastpos+i<oldsize);) {
|
||
|
if(old[lastpos+i]==newbuf[lastscan+i]) s++;
|
||
|
i++;
|
||
|
if(s*2-i>Sf*2-lenf) { Sf=s; lenf=i; };
|
||
|
};
|
||
|
|
||
|
lenb=0;
|
||
|
if(scan<newsize) {
|
||
|
s=0;Sb=0;
|
||
|
for(i=1;(scan>=lastscan+i)&&(pos>=i);i++) {
|
||
|
if(old[pos-i]==newbuf[scan-i]) s++;
|
||
|
if(s*2-i>Sb*2-lenb) { Sb=s; lenb=i; };
|
||
|
};
|
||
|
};
|
||
|
|
||
|
if(lastscan+lenf>scan-lenb) {
|
||
|
overlap=(lastscan+lenf)-(scan-lenb);
|
||
|
s=0;Ss=0;lens=0;
|
||
|
for(i=0;i<overlap;i++) {
|
||
|
if(newbuf[lastscan+lenf-overlap+i]==
|
||
|
old[lastpos+lenf-overlap+i]) s++;
|
||
|
if(newbuf[scan-lenb+i]==
|
||
|
old[pos-lenb+i]) s--;
|
||
|
if(s>Ss) { Ss=s; lens=i+1; };
|
||
|
};
|
||
|
|
||
|
lenf+=lens-overlap;
|
||
|
lenb-=lens;
|
||
|
};
|
||
|
|
||
|
for(i=0;i<lenf;i++)
|
||
|
db[dblen+i]=newbuf[lastscan+i]-old[lastpos+i];
|
||
|
for(i=0;i<(scan-lenb)-(lastscan+lenf);i++)
|
||
|
eb[eblen+i]=newbuf[lastscan+lenf+i];
|
||
|
|
||
|
dblen+=lenf;
|
||
|
eblen+=(scan-lenb)-(lastscan+lenf);
|
||
|
|
||
|
triple.x = htonl(lenf);
|
||
|
triple.y = htonl((scan-lenb)-(lastscan+lenf));
|
||
|
triple.z = htonl((pos-lenb)-(lastpos+lenf));
|
||
|
if (write(fd,&triple,sizeof(triple)) != sizeof(triple))
|
||
|
reporterr(1,NULL);
|
||
|
|
||
|
#ifdef DEBUG_bsmedberg
|
||
|
printf("Writing a block:\n"
|
||
|
" X: %u\n"
|
||
|
" Y: %u\n"
|
||
|
" Z: %i\n",
|
||
|
(PRUint32) lenf,
|
||
|
(PRUint32) ((scan-lenb)-(lastscan+lenf)),
|
||
|
(PRUint32) ((pos-lenb)-(lastpos+lenf)));
|
||
|
#endif
|
||
|
|
||
|
++numtriples;
|
||
|
|
||
|
lastscan=scan-lenb;
|
||
|
lastpos=pos-lenb;
|
||
|
lastoffset=pos-scan;
|
||
|
};
|
||
|
};
|
||
|
|
||
|
if(write(fd,db,dblen)!=dblen)
|
||
|
reporterr(1,NULL);
|
||
|
|
||
|
if(write(fd,eb,eblen)!=eblen)
|
||
|
reporterr(1,NULL);
|
||
|
|
||
|
header.slen = htonl(oldsize);
|
||
|
header.scrc32 = htonl(scrc);
|
||
|
header.dlen = htonl(newsize);
|
||
|
header.cblen = htonl(numtriples * sizeof(MBSPatchTriple));
|
||
|
header.difflen = htonl(dblen);
|
||
|
header.extralen = htonl(eblen);
|
||
|
|
||
|
if (lseek(fd,0,SEEK_SET) == -1 ||
|
||
|
write(fd,&header,sizeof(header)) != sizeof(header) ||
|
||
|
close(fd) == -1)
|
||
|
reporterr(1,NULL);
|
||
|
|
||
|
free(db);
|
||
|
free(eb);
|
||
|
free(I);
|
||
|
free(old);
|
||
|
free(newbuf);
|
||
|
|
||
|
return 0;
|
||
|
}
|