tar.c

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    1 #include "u.h"
    2 #include "../port/lib.h"
    3 #include "mem.h"
    4 #include "dat.h"
    5 #include "fns.h"
    6 #include "io.h"
    7 #include "../port/error.h"
    8 
    9 typedef union Hblock Hblock;
   10 
   11 #define TBLOCK  512
   12 #define NAMSIZ  100
   13 union   Hblock
   14 {
   15         char    dummy[TBLOCK];
   16         struct  header
   17         {
   18                 char    name[NAMSIZ];
   19                 char    mode[8];
   20                 char    uid[8];
   21                 char    gid[8];
   22                 char    size[12];
   23                 char    mtime[12];
   24                 char    chksum[8];
   25                 char    linkflag;
   26                 char    linkname[NAMSIZ];
   27         } dbuf;
   28 };
   29 
   30 static int getdir(Hblock *hb, Dir *sp);
   31 static int checksum(Hblock *hb);
   32 
   33 uchar*
   34 tarlookup(uchar *addr, char *file, int *dlen)
   35 {
   36         Hblock *hp;
   37         Dir dir;
   38 
   39         hp = (Hblock*)addr;
   40         while(getdir(hp, &dir) != 0) {
   41                 if(strcmp(file, hp->dbuf.name) == 0) {
   42                         *dlen = dir.length;
   43                         return (uchar*)(hp+1);
   44                 }
   45                 hp += (dir.length+TBLOCK-1)/TBLOCK + 1;
   46         }
   47         return 0;
   48 }
   49 
   50 static int
   51 getdir(Hblock *hp, Dir *sp)
   52 {
   53         int chksum;
   54 
   55         if (hp->dbuf.name[0] == '\0')
   56                 return 0;
   57         sp->length = strtol(hp->dbuf.size, 0, 8);
   58         sp->mtime = strtol(hp->dbuf.mtime, 0, 8);
   59         chksum = strtol(hp->dbuf.chksum, 0, 8);
   60         if (chksum != checksum(hp)) {
   61                 print("directory checksum error\n");
   62                 return 0;
   63         }       
   64         return 1;
   65 }
   66 
   67 static int
   68 checksum(Hblock *hp)
   69 {
   70         int i;
   71         char *cp;
   72 
   73         i = 0;
   74         for (cp = hp->dummy; cp < &hp->dummy[TBLOCK]; cp++) {
   75                 if(cp < hp->dbuf.chksum || cp >= &hp->dbuf.chksum[sizeof(hp->dbuf.chksum)])
   76                         i += *cp & 0xff;
   77                 else
   78                         i += ' ' & 0xff;
   79         }
   80         return(i);
   81 }

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FreeBSD/Linux Kernel Cross Reference sys/bitsy/tar.c

FreeBSD/Linux Kernel Cross Reference
sys/bitsy/tar.c