* bsdiff updated to 4.3. This makes Nix depend on libbz2.
This commit is contained in:
Eelco Dolstra
parent
9e4ffc43a2
commit
8291f6d968
15 changed files with 464 additions and 520 deletions
404
src/bsdiff-4.3/bsdiff.c
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404
src/bsdiff-4.3/bsdiff.c
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@ -0,0 +1,404 @@
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/*-
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* Copyright 2003-2005 Colin Percival
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* All rights reserved
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted providing that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
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* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#if 0
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__FBSDID("$FreeBSD: src/usr.bin/bsdiff/bsdiff/bsdiff.c,v 1.1 2005/08/06 01:59:05 cperciva Exp $");
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#endif
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#include <sys/types.h>
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#include <bzlib.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define MIN(x,y) (((x)<(y)) ? (x) : (y))
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static void split(off_t *I,off_t *V,off_t start,off_t len,off_t h)
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{
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off_t i,j,k,x,tmp,jj,kk;
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if(len<16) {
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for(k=start;k<start+len;k+=j) {
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j=1;x=V[I[k]+h];
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for(i=1;k+i<start+len;i++) {
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if(V[I[k+i]+h]<x) {
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x=V[I[k+i]+h];
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j=0;
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};
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if(V[I[k+i]+h]==x) {
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tmp=I[k+j];I[k+j]=I[k+i];I[k+i]=tmp;
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j++;
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};
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};
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for(i=0;i<j;i++) V[I[k+i]]=k+j-1;
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if(j==1) I[k]=-1;
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};
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return;
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};
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x=V[I[start+len/2]+h];
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jj=0;kk=0;
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for(i=start;i<start+len;i++) {
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if(V[I[i]+h]<x) jj++;
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if(V[I[i]+h]==x) kk++;
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};
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jj+=start;kk+=jj;
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i=start;j=0;k=0;
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while(i<jj) {
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if(V[I[i]+h]<x) {
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i++;
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} else if(V[I[i]+h]==x) {
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tmp=I[i];I[i]=I[jj+j];I[jj+j]=tmp;
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j++;
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} else {
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tmp=I[i];I[i]=I[kk+k];I[kk+k]=tmp;
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k++;
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};
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};
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while(jj+j<kk) {
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if(V[I[jj+j]+h]==x) {
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j++;
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} else {
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tmp=I[jj+j];I[jj+j]=I[kk+k];I[kk+k]=tmp;
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k++;
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};
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};
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if(jj>start) split(I,V,start,jj-start,h);
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for(i=0;i<kk-jj;i++) V[I[jj+i]]=kk-1;
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if(jj==kk-1) I[jj]=-1;
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if(start+len>kk) split(I,V,kk,start+len-kk,h);
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}
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static void qsufsort(off_t *I,off_t *V,u_char *old,off_t oldsize)
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{
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off_t buckets[256];
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off_t i,h,len;
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for(i=0;i<256;i++) buckets[i]=0;
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for(i=0;i<oldsize;i++) buckets[old[i]]++;
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for(i=1;i<256;i++) buckets[i]+=buckets[i-1];
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for(i=255;i>0;i--) buckets[i]=buckets[i-1];
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buckets[0]=0;
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for(i=0;i<oldsize;i++) I[++buckets[old[i]]]=i;
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I[0]=oldsize;
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for(i=0;i<oldsize;i++) V[i]=buckets[old[i]];
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V[oldsize]=0;
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for(i=1;i<256;i++) if(buckets[i]==buckets[i-1]+1) I[buckets[i]]=-1;
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I[0]=-1;
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for(h=1;I[0]!=-(oldsize+1);h+=h) {
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len=0;
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for(i=0;i<oldsize+1;) {
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if(I[i]<0) {
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len-=I[i];
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i-=I[i];
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} else {
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if(len) I[i-len]=-len;
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len=V[I[i]]+1-i;
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split(I,V,i,len,h);
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i+=len;
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len=0;
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};
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};
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if(len) I[i-len]=-len;
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};
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for(i=0;i<oldsize+1;i++) I[V[i]]=i;
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}
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static off_t matchlen(u_char *old,off_t oldsize,u_char *new,off_t newsize)
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{
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off_t i;
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for(i=0;(i<oldsize)&&(i<newsize);i++)
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if(old[i]!=new[i]) break;
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return i;
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}
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static off_t search(off_t *I,u_char *old,off_t oldsize,
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u_char *new,off_t newsize,off_t st,off_t en,off_t *pos)
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{
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off_t x,y;
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if(en-st<2) {
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x=matchlen(old+I[st],oldsize-I[st],new,newsize);
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y=matchlen(old+I[en],oldsize-I[en],new,newsize);
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if(x>y) {
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*pos=I[st];
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return x;
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} else {
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*pos=I[en];
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return y;
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}
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};
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x=st+(en-st)/2;
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if(memcmp(old+I[x],new,MIN(oldsize-I[x],newsize))<0) {
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return search(I,old,oldsize,new,newsize,x,en,pos);
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} else {
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return search(I,old,oldsize,new,newsize,st,x,pos);
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};
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}
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static void offtout(off_t x,u_char *buf)
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{
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off_t y;
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if(x<0) y=-x; else y=x;
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buf[0]=y%256;y-=buf[0];
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y=y/256;buf[1]=y%256;y-=buf[1];
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y=y/256;buf[2]=y%256;y-=buf[2];
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y=y/256;buf[3]=y%256;y-=buf[3];
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y=y/256;buf[4]=y%256;y-=buf[4];
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y=y/256;buf[5]=y%256;y-=buf[5];
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y=y/256;buf[6]=y%256;y-=buf[6];
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y=y/256;buf[7]=y%256;
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if(x<0) buf[7]|=0x80;
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}
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int main(int argc,char *argv[])
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{
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int fd;
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u_char *old,*new;
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off_t oldsize,newsize;
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off_t *I,*V;
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off_t scan,pos,len;
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off_t lastscan,lastpos,lastoffset;
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off_t oldscore,scsc;
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off_t s,Sf,lenf,Sb,lenb;
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off_t overlap,Ss,lens;
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off_t i;
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off_t dblen,eblen;
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u_char *db,*eb;
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u_char buf[8];
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u_char header[32];
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FILE * pf;
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BZFILE * pfbz2;
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int bz2err;
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if(argc!=4) errx(1,"usage: %s oldfile newfile patchfile\n",argv[0]);
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/* Allocate oldsize+1 bytes instead of oldsize bytes to ensure
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that we never try to malloc(0) and get a NULL pointer */
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if(((fd=open(argv[1],O_RDONLY,0))<0) ||
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((oldsize=lseek(fd,0,SEEK_END))==-1) ||
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((old=malloc(oldsize+1))==NULL) ||
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(lseek(fd,0,SEEK_SET)!=0) ||
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(read(fd,old,oldsize)!=oldsize) ||
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(close(fd)==-1)) err(1,"%s",argv[1]);
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if(((I=malloc((oldsize+1)*sizeof(off_t)))==NULL) ||
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((V=malloc((oldsize+1)*sizeof(off_t)))==NULL)) err(1,NULL);
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qsufsort(I,V,old,oldsize);
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free(V);
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/* Allocate newsize+1 bytes instead of newsize bytes to ensure
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that we never try to malloc(0) and get a NULL pointer */
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if(((fd=open(argv[2],O_RDONLY,0))<0) ||
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((newsize=lseek(fd,0,SEEK_END))==-1) ||
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((new=malloc(newsize+1))==NULL) ||
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(lseek(fd,0,SEEK_SET)!=0) ||
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(read(fd,new,newsize)!=newsize) ||
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(close(fd)==-1)) err(1,"%s",argv[2]);
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if(((db=malloc(newsize+1))==NULL) ||
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((eb=malloc(newsize+1))==NULL)) err(1,NULL);
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dblen=0;
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eblen=0;
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/* Create the patch file */
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if ((pf = fopen(argv[3], "w")) == NULL)
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err(1, "%s", argv[3]);
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/* Header is
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0 8 "BSDIFF40"
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8 8 length of bzip2ed ctrl block
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16 8 length of bzip2ed diff block
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24 8 length of new file */
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/* File is
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0 32 Header
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32 ?? Bzip2ed ctrl block
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?? ?? Bzip2ed diff block
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?? ?? Bzip2ed extra block */
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memcpy(header,"BSDIFF40",8);
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offtout(0, header + 8);
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offtout(0, header + 16);
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offtout(newsize, header + 24);
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if (fwrite(header, 32, 1, pf) != 1)
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err(1, "fwrite(%s)", argv[3]);
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/* Compute the differences, writing ctrl as we go */
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if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL)
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errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err);
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scan=0;len=0;
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lastscan=0;lastpos=0;lastoffset=0;
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while(scan<newsize) {
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oldscore=0;
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for(scsc=scan+=len;scan<newsize;scan++) {
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len=search(I,old,oldsize,new+scan,newsize-scan,
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0,oldsize,&pos);
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for(;scsc<scan+len;scsc++)
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if((scsc+lastoffset<oldsize) &&
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(old[scsc+lastoffset] == new[scsc]))
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oldscore++;
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if(((len==oldscore) && (len!=0)) ||
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(len>oldscore+8)) break;
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if((scan+lastoffset<oldsize) &&
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(old[scan+lastoffset] == new[scan]))
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oldscore--;
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};
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if((len!=oldscore) || (scan==newsize)) {
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s=0;Sf=0;lenf=0;
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for(i=0;(lastscan+i<scan)&&(lastpos+i<oldsize);) {
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if(old[lastpos+i]==new[lastscan+i]) s++;
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i++;
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if(s*2-i>Sf*2-lenf) { Sf=s; lenf=i; };
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};
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lenb=0;
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if(scan<newsize) {
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s=0;Sb=0;
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for(i=1;(scan>=lastscan+i)&&(pos>=i);i++) {
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if(old[pos-i]==new[scan-i]) s++;
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if(s*2-i>Sb*2-lenb) { Sb=s; lenb=i; };
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};
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};
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if(lastscan+lenf>scan-lenb) {
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overlap=(lastscan+lenf)-(scan-lenb);
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s=0;Ss=0;lens=0;
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for(i=0;i<overlap;i++) {
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if(new[lastscan+lenf-overlap+i]==
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old[lastpos+lenf-overlap+i]) s++;
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if(new[scan-lenb+i]==
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old[pos-lenb+i]) s--;
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if(s>Ss) { Ss=s; lens=i+1; };
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};
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lenf+=lens-overlap;
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lenb-=lens;
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};
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for(i=0;i<lenf;i++)
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db[dblen+i]=new[lastscan+i]-old[lastpos+i];
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for(i=0;i<(scan-lenb)-(lastscan+lenf);i++)
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eb[eblen+i]=new[lastscan+lenf+i];
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dblen+=lenf;
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eblen+=(scan-lenb)-(lastscan+lenf);
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offtout(lenf,buf);
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BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
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if (bz2err != BZ_OK)
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errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
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offtout((scan-lenb)-(lastscan+lenf),buf);
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BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
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if (bz2err != BZ_OK)
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errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
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offtout((pos-lenb)-(lastpos+lenf),buf);
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BZ2_bzWrite(&bz2err, pfbz2, buf, 8);
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if (bz2err != BZ_OK)
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errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
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lastscan=scan-lenb;
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lastpos=pos-lenb;
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lastoffset=pos-scan;
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};
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};
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BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL);
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if (bz2err != BZ_OK)
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errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err);
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/* Compute size of compressed ctrl data */
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if ((len = ftello(pf)) == -1)
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err(1, "ftello");
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offtout(len-32, header + 8);
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/* Write compressed diff data */
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if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL)
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errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err);
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BZ2_bzWrite(&bz2err, pfbz2, db, dblen);
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if (bz2err != BZ_OK)
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errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
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BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL);
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if (bz2err != BZ_OK)
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errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err);
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/* Compute size of compressed diff data */
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if ((newsize = ftello(pf)) == -1)
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err(1, "ftello");
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offtout(newsize - len, header + 16);
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/* Write compressed extra data */
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if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL)
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errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err);
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BZ2_bzWrite(&bz2err, pfbz2, eb, eblen);
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if (bz2err != BZ_OK)
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errx(1, "BZ2_bzWrite, bz2err = %d", bz2err);
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BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL);
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if (bz2err != BZ_OK)
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errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err);
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/* Seek to the beginning, write the header, and close the file */
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if (fseeko(pf, 0, SEEK_SET))
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err(1, "fseeko");
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if (fwrite(header, 32, 1, pf) != 1)
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err(1, "fwrite(%s)", argv[3]);
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if (fclose(pf))
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err(1, "fclose");
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/* Free the memory we used */
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free(db);
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free(eb);
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free(I);
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free(old);
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free(new);
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return 0;
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}
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