diff options
Diffstat (limited to 'src/bsdiff-4.2/bspatch.c')
| -rw-r--r-- | src/bsdiff-4.2/bspatch.c | 216 |
1 files changed, 0 insertions, 216 deletions
diff --git a/src/bsdiff-4.2/bspatch.c b/src/bsdiff-4.2/bspatch.c deleted file mode 100644 index 1386a7096213..000000000000 --- a/src/bsdiff-4.2/bspatch.c +++ /dev/null @@ -1,216 +0,0 @@ -/* - .c -- Binary patcher - - Copyright 2003,2004 Colin Percival - - For the terms under which this work may be distributed, please see - the adjoining file "LICENSE". -*/ - -#ifndef BZIP2 -#define BZIP2 "/usr/bin/bzip2" -#endif - -#include <stdlib.h> -#include <stdio.h> -#include <err.h> -#include <unistd.h> -#include <fcntl.h> -#include <sys/wait.h> - -ssize_t loopread(int d,void *buf,size_t nbytes) -{ - ssize_t ptr,lenread; - - for(ptr=0;ptr<nbytes;ptr+=lenread) { - lenread=read(d,buf+ptr,nbytes-ptr); - if(lenread==0) return ptr; - if(lenread==-1) return -1; - }; - return ptr; -} - -int bz2read(int fd,off_t offset,off_t len,char * fname,pid_t * pids) -{ - int p0[2],p1[2]; - u_char * data; - - if((pipe(p0)==-1) || (pipe(p1)==-1)) err(1,NULL); - - if((pids[0]=fork())==-1) err(1,NULL); - if(pids[0]==0) { - if(close(0) || close(1) || close(p0[0]) || - close(p1[0]) || close(p1[1])) err(1,NULL); - if((data=malloc(len+1))==NULL) err(1,NULL); - if((pread(fd,data,len,offset)!=len) || close(fd)) - err(1,"%s",fname); - if((write(p0[1],data,len)!=len) || close(p0[1])) - err(1,NULL); - free(data); - _exit(0); - }; - - if((pids[1]=fork())==-1) err(1,NULL); - if(pids[1]==0) { - if(close(0) || close(1) || close(p0[1]) || - close(p1[0])) err(1,NULL); - if((dup2(p0[0],0)==-1) || close(p0[0])) err(1,NULL); - if((dup2(p1[1],1)==-1) || close(p1[1])) err(1,NULL); - if(close(fd)==-1) err(1,"%s",fname); - - execl(BZIP2,BZIP2,"-dc",NULL); - err(1,"%s",BZIP2); - }; - - if(close(p0[0]) || close(p0[1]) || close(p1[1])) err(1,NULL); - - return p1[0]; -} - -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[]) -{ - int fd,ctrlpipe,diffpipe,extrapipe; - pid_t pids[6]; - ssize_t patchsize,oldsize,newsize; - ssize_t bzctrllen,bzdatalen; - u_char header[32],buf[8]; - int version=0; - 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]); - - if(((fd=open(argv[3],O_RDONLY,0))<0) || - ((patchsize=lseek(fd,0,SEEK_END))==-1) || - (lseek(fd,0,SEEK_SET)!=0)) err(1,"%s",argv[3]); - if(patchsize<32) errx(1,"Corrupt patch\n"); - - /* - Ok, this is going to be messy. There are two different patch - formats which we need to support. - - The old format (pre-4.0) is: - 0 8 "QSUFDIFF" or "BSDIFF30" - 8 8 X - 16 8 Y - 24 8 sizeof(newfile) - 32 X bzip2(control block) - 32+X Y bzip2(data block) - with control block a set of pairs (x,y) meaning "seek forward - in oldfile by y bytes, and add the next x bytes to x bytes from - the data block". - - The new format (4.0) is: - 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". - */ - - if(read(fd,header,32)!=32) err(1,"%s",argv[3]); - if(memcmp(header,"QSUFDIFF",8)==0) version=1; - if(memcmp(header,"BSDIFF30",8)==0) version=1; - if(memcmp(header,"BSDIFF40",8)==0) version=2; - - if(!version) errx(1,"Corrupt patch\n"); - - bzctrllen=offtin(header+8); - bzdatalen=offtin(header+16); - newsize=offtin(header+24); - if((bzctrllen<0) || (bzdatalen<0) || (newsize<0) || - ((version==1) && (32+bzctrllen+bzdatalen!=patchsize))) - errx(1,"Corrupt patch\n"); - - ctrlpipe=bz2read(fd,32,bzctrllen,argv[3],pids); - diffpipe=bz2read(fd,32+bzctrllen,bzdatalen,argv[3],pids+2); - if(version==2) { - extrapipe=bz2read(fd,32+bzctrllen+bzdatalen, - patchsize-(32+bzctrllen+bzdatalen),argv[3],pids+4); - }; - - if(close(fd)==-1) err(1,"%s",argv[3]); - 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<=version;i++) { - if((lenread=loopread(ctrlpipe,buf,8))<0) err(1,NULL); - if(lenread<8) errx(1,"Corrupt patch\n"); - ctrl[i]=offtin(buf); - }; - - if(version==1) oldpos+=ctrl[1]; - - if(newpos+ctrl[0]>newsize) errx(1,"Corrupt patch\n"); - if((lenread=loopread(diffpipe,new+newpos,ctrl[0]))<0) - err(1,NULL); - 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(version==2) { - if(newpos+ctrl[1]>newsize) errx(1,"Corrupt patch\n"); - if((lenread=loopread(extrapipe,new+newpos,ctrl[1]))<0) - err(1,NULL); - if(lenread!=ctrl[1]) errx(1,"Corrupt patch\n"); - - newpos+=ctrl[1]; - oldpos+=ctrl[2]; - }; - }; - - if(loopread(ctrlpipe,buf,1)!=0) errx(1,"Corrupt patch\n"); - if(loopread(diffpipe,buf,1)!=0) errx(1,"Corrupt patch\n"); - if(version==2) - if(loopread(extrapipe,buf,1)!=0) errx(1,"Corrupt patch\n"); - - if(close(ctrlpipe) || close(diffpipe) || - ((version==2) && close(extrapipe))) - err(1,NULL); - for(i=0;i<(version+1)*2;i++) waitpid(pids[i],NULL,0); - - 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; -} |