diff options
Diffstat (limited to 'src/bsdiff-4.3/bsdiff.c')
| -rw-r--r-- | src/bsdiff-4.3/bsdiff.c | 405 |
1 files changed, 0 insertions, 405 deletions
diff --git a/src/bsdiff-4.3/bsdiff.c b/src/bsdiff-4.3/bsdiff.c deleted file mode 100644 index 374ed038f..000000000 --- a/src/bsdiff-4.3/bsdiff.c +++ /dev/null @@ -1,405 +0,0 @@ -/*- - * 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/bsdiff/bsdiff.c,v 1.1 2005/08/06 01:59:05 cperciva Exp $"); -#endif - -#include <sys/types.h> - -#include <bzlib.h> -#include <err.h> -#include <fcntl.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> - -#define MIN(x,y) (((x)<(y)) ? (x) : (y)) - -static void split(off_t *I,off_t *V,off_t start,off_t len,off_t h) -{ - off_t 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(off_t *I,off_t *V,u_char *old,off_t oldsize) -{ - off_t buckets[256]; - off_t 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 off_t matchlen(u_char *old,off_t oldsize,u_char *new,off_t newsize) -{ - off_t i; - - for(i=0;(i<oldsize)&&(i<newsize);i++) - if(old[i]!=new[i]) break; - - return i; -} - -static off_t search(off_t *I,u_char *old,off_t oldsize, - u_char *new,off_t newsize,off_t st,off_t en,off_t *pos) -{ - off_t x,y; - - if(en-st<2) { - x=matchlen(old+I[st],oldsize-I[st],new,newsize); - y=matchlen(old+I[en],oldsize-I[en],new,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],new,MIN(oldsize-I[x],newsize))<0) { - return search(I,old,oldsize,new,newsize,x,en,pos); - } else { - return search(I,old,oldsize,new,newsize,st,x,pos); - }; -} - -static void offtout(off_t x,u_char *buf) -{ - off_t y; - - if(x<0) y=-x; else y=x; - - buf[0]=y%256;y-=buf[0]; - y=y/256;buf[1]=y%256;y-=buf[1]; - y=y/256;buf[2]=y%256;y-=buf[2]; - y=y/256;buf[3]=y%256;y-=buf[3]; - y=y/256;buf[4]=y%256;y-=buf[4]; - y=y/256;buf[5]=y%256;y-=buf[5]; - y=y/256;buf[6]=y%256;y-=buf[6]; - y=y/256;buf[7]=y%256; - - if(x<0) buf[7]|=0x80; -} - -int main(int argc,char *argv[]) -{ - int fd; - u_char *old,*new; - off_t oldsize,newsize; - off_t *I,*V; - off_t scan,pos,len; - off_t lastscan,lastpos,lastoffset; - off_t oldscore,scsc; - off_t s,Sf,lenf,Sb,lenb; - off_t overlap,Ss,lens; - off_t i; - off_t dblen,eblen; - u_char *db,*eb; - u_char buf[8]; - u_char header[32]; - FILE * pf; - BZFILE * pfbz2; - int bz2err; - - if(argc!=4) errx(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,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(((I=malloc((oldsize+1)*sizeof(off_t)))==NULL) || - ((V=malloc((oldsize+1)*sizeof(off_t)))==NULL)) err(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,0))<0) || - ((newsize=lseek(fd,0,SEEK_END))==-1) || - ((new=malloc(newsize+1))==NULL) || - (lseek(fd,0,SEEK_SET)!=0) || - (read(fd,new,newsize)!=newsize) || - (close(fd)==-1)) err(1,"%s",argv[2]); - - if(((db=malloc(newsize+1))==NULL) || - ((eb=malloc(newsize+1))==NULL)) err(1,NULL); - dblen=0; - eblen=0; - - /* Create the patch file */ - if ((pf = fopen(argv[3], "w")) == NULL) - err(1, "%s", argv[3]); - - /* Header is - 0 8 "BSDIFF40" - 8 8 length of bzip2ed ctrl block - 16 8 length of bzip2ed diff block - 24 8 length of new file */ - /* File is - 0 32 Header - 32 ?? Bzip2ed ctrl block - ?? ?? Bzip2ed diff block - ?? ?? Bzip2ed extra block */ - memcpy(header,"BSDIFF40",8); - offtout(0, header + 8); - offtout(0, header + 16); - offtout(newsize, header + 24); - if (fwrite(header, 32, 1, pf) != 1) - err(1, "fwrite(%s)", argv[3]); - - /* Compute the differences, writing ctrl as we go */ - if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL) - errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err); - scan=0;len=0; - lastscan=0;lastpos=0;lastoffset=0; - while(scan<newsize) { - oldscore=0; - - for(scsc=scan+=len;scan<newsize;scan++) { - len=search(I,old,oldsize,new+scan,newsize-scan, - 0,oldsize,&pos); - if (len > 64 * 1024) break; - - for(;scsc<scan+len;scsc++) - if((scsc+lastoffset<oldsize) && - (old[scsc+lastoffset] == new[scsc])) - oldscore++; - - if(((len==oldscore) && (len!=0)) || - (len>oldscore+8)) break; - - if((scan+lastoffset<oldsize) && - (old[scan+lastoffset] == new[scan])) - oldscore--; - }; - - if((len!=oldscore) || (scan==newsize)) { - s=0;Sf=0;lenf=0; - for(i=0;(lastscan+i<scan)&&(lastpos+i<oldsize);) { - if(old[lastpos+i]==new[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]==new[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(new[lastscan+lenf-overlap+i]== - old[lastpos+lenf-overlap+i]) s++; - if(new[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]=new[lastscan+i]-old[lastpos+i]; - for(i=0;i<(scan-lenb)-(lastscan+lenf);i++) - eb[eblen+i]=new[lastscan+lenf+i]; - - dblen+=lenf; - eblen+=(scan-lenb)-(lastscan+lenf); - - offtout(lenf,buf); - BZ2_bzWrite(&bz2err, pfbz2, buf, 8); - if (bz2err != BZ_OK) - errx(1, "BZ2_bzWrite, bz2err = %d", bz2err); - - offtout((scan-lenb)-(lastscan+lenf),buf); - BZ2_bzWrite(&bz2err, pfbz2, buf, 8); - if (bz2err != BZ_OK) - errx(1, "BZ2_bzWrite, bz2err = %d", bz2err); - - offtout((pos-lenb)-(lastpos+lenf),buf); - BZ2_bzWrite(&bz2err, pfbz2, buf, 8); - if (bz2err != BZ_OK) - errx(1, "BZ2_bzWrite, bz2err = %d", bz2err); - - lastscan=scan-lenb; - lastpos=pos-lenb; - lastoffset=pos-scan; - }; - }; - BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL); - if (bz2err != BZ_OK) - errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err); - - /* Compute size of compressed ctrl data */ - if ((len = ftello(pf)) == -1) - err(1, "ftello"); - offtout(len-32, header + 8); - - /* Write compressed diff data */ - if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL) - errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err); - BZ2_bzWrite(&bz2err, pfbz2, db, dblen); - if (bz2err != BZ_OK) - errx(1, "BZ2_bzWrite, bz2err = %d", bz2err); - BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL); - if (bz2err != BZ_OK) - errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err); - - /* Compute size of compressed diff data */ - if ((newsize = ftello(pf)) == -1) - err(1, "ftello"); - offtout(newsize - len, header + 16); - - /* Write compressed extra data */ - if ((pfbz2 = BZ2_bzWriteOpen(&bz2err, pf, 9, 0, 0)) == NULL) - errx(1, "BZ2_bzWriteOpen, bz2err = %d", bz2err); - BZ2_bzWrite(&bz2err, pfbz2, eb, eblen); - if (bz2err != BZ_OK) - errx(1, "BZ2_bzWrite, bz2err = %d", bz2err); - BZ2_bzWriteClose(&bz2err, pfbz2, 0, NULL, NULL); - if (bz2err != BZ_OK) - errx(1, "BZ2_bzWriteClose, bz2err = %d", bz2err); - - /* Seek to the beginning, write the header, and close the file */ - if (fseeko(pf, 0, SEEK_SET)) - err(1, "fseeko"); - if (fwrite(header, 32, 1, pf) != 1) - err(1, "fwrite(%s)", argv[3]); - if (fclose(pf)) - err(1, "fclose"); - - /* Free the memory we used */ - free(db); - free(eb); - free(I); - free(old); - free(new); - - return 0; -} |