## diffname mpc/tar.c 2000/0516 ## diff -e /dev/null /n/emeliedump/2000/0516/sys/src/9/mpc/tar.c 0a #include "u.h" #include "../port/lib.h" #include "mem.h" #include "dat.h" #include "fns.h" #include "io.h" #include "../port/error.h" typedef union Hblock Hblock; #define TBLOCK 512 #define NAMSIZ 100 union Hblock { char dummy[TBLOCK]; struct header { char name[NAMSIZ]; char mode[8]; char uid[8]; char gid[8]; char size[12]; char mtime[12]; char chksum[8]; char linkflag; char linkname[NAMSIZ]; } dbuf; }; static int getdir(Hblock *hb, Dir *sp); static int checksum(Hblock *hb); uchar* tarlookup(uchar *addr, char *file, int *dlen) { Hblock *hp; Dir dir; print("tarlookup: %x\n", addr); hp = (Hblock*)addr; while(getdir(hp, &dir) != 0) { print("name = %s\n", hp->dbuf.name); if(strcmp(file, hp->dbuf.name) == 0) { *dlen = dir.length; return (uchar*)(hp+1); } hp += (dir.length+TBLOCK-1)/TBLOCK + 1; } return 0; } static int getdir(Hblock *hp, Dir *sp) { int chksum; if (hp->dbuf.name[0] == '\0') return 0; sp->mode = strtol(hp->dbuf.mode, 0, 8); strncpy(sp->uid, "adm", sizeof(sp->uid)); strncpy(sp->gid, "adm", sizeof(sp->gid)); sp->length = strtol(hp->dbuf.size, 0, 8); sp->mtime = strtol(hp->dbuf.mtime, 0, 8); chksum = strtol(hp->dbuf.chksum, 0, 8); if (chksum != checksum(hp)) { print("directory checksum error\n"); return 0; } return 1; } static int checksum(Hblock *hp) { int i; char *cp; i = 0; for (cp = hp->dummy; cp < &hp->dummy[TBLOCK]; cp++) { if(cp < hp->dbuf.chksum || cp >= &hp->dbuf.chksum[sizeof(hp->dbuf.chksum)]) i += *cp & 0xff; else i += ' ' & 0xff; } return(i); } . ## diffname mpc/tar.c 2000/0521 ## diff -e /n/emeliedump/2000/0516/sys/src/9/mpc/tar.c /n/emeliedump/2000/0521/sys/src/9/mpc/tar.c 39c print("tarlookup: %p\n", addr); . ## diffname mpc/tar.c 2001/0527 # deleted ## diff -e /n/emeliedump/2000/0521/sys/src/9/mpc/tar.c /n/emeliedump/2001/0527/sys/src/9/mpc/tar.c 1,86d