disk/format: implement long name support
This commit is contained in:
cinap_lenrek
parent
ac98922f44
commit
a611fe20e1
1 changed files with 177 additions and 17 deletions
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@ -108,6 +108,12 @@ struct Dosdir
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uchar length[4];
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};
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enum {
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DOSDIRSIZE = 32,
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DOSRUNE = 13, /* runes per dosdir in a long file name */
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DOSNAMELEN = 261,
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};
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#define DRONLY 0x01
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#define DHIDDEN 0x02
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#define DSYSTEM 0x04
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@ -177,7 +183,7 @@ enum
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void dosfs(int, int, Disk*, char*, int, char*[], int);
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ulong clustalloc(int);
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void addrname(uchar*, Dir*, char*, ulong);
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uchar* addrname(uchar*, Dir*, char*, ulong);
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void sanitycheck(Disk*);
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void
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@ -568,18 +574,18 @@ Tryagain:
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for(i=0;; i++){
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fatsecs = (fatbits*clusters + 8*secsize - 1)/(8*secsize);
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rootsecs = volsecs/200;
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rootfiles = rootsecs * (secsize/sizeof(Dosdir));
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rootfiles = rootsecs * (secsize/DOSDIRSIZE);
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if(rootfiles > 512){
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rootfiles = 512;
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rootsecs = rootfiles/(secsize/sizeof(Dosdir));
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rootsecs = rootfiles/(secsize/DOSDIRSIZE);
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}
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if(fatbits == 32){
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rootsecs -= (rootsecs % clustersize);
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if(rootsecs <= 0)
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rootsecs = clustersize;
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rootfiles = rootsecs * (secsize/sizeof(Dosdir));
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rootfiles = rootsecs * (secsize/DOSDIRSIZE);
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}
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data = nresrv + 2*fatsecs + (rootfiles*sizeof(Dosdir) + secsize-1)/secsize;
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data = nresrv + 2*fatsecs + (rootfiles*DOSDIRSIZE + secsize-1)/secsize;
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newclusters = 2 + (volsecs - data)/clustersize;
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if(newclusters == clusters)
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break;
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@ -717,7 +723,7 @@ if(chatty) print("files @%lluX\n", seek(disk->wfd, 0LL, 1));
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* If we have any arguments, process
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* them and write out.
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*/
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for(p = root; argc > 0; argc--, argv++, p += sizeof(Dosdir)){
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for(p = root; argc > 0; argc--, argv++, p += DOSDIRSIZE){
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if(p >= (root+(rootsecs*secsize)))
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fatal("too many files in root");
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/*
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@ -776,7 +782,7 @@ if(chatty) print("%s @%lluX\n", d->name, seek(disk->wfd, 0LL, 1));
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* Add the filename to the root.
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*/
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fprint(2, "add %s at clust %lux\n", d->name, x);
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addrname(p, d, *argv, x);
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p = addrname(p, d, *argv, x);
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free(d);
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}
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@ -864,6 +870,20 @@ clustalloc(int flag)
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}
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}
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void
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puttime(Dosdir *d)
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{
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Tm *t = localtime(time(0));
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ushort x;
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x = (t->hour<<11) | (t->min<<5) | (t->sec>>1);
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d->time[0] = x;
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d->time[1] = x>>8;
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x = ((t->year-80)<<9) | ((t->mon+1)<<5) | t->mday;
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d->date[0] = x;
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d->date[1] = x>>8;
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}
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void
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putname(char *p, Dosdir *d)
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{
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@ -885,21 +905,132 @@ putname(char *p, Dosdir *d)
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}
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}
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void
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puttime(Dosdir *d)
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int
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islongname(char *buf)
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{
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Tm *t = localtime(time(0));
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ushort x;
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char *p, *dot;
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int c, isextended, is8dot3, ndot;
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x = (t->hour<<11) | (t->min<<5) | (t->sec>>1);
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d->time[0] = x;
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d->time[1] = x>>8;
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x = ((t->year-80)<<9) | ((t->mon+1)<<5) | t->mday;
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d->date[0] = x;
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d->date[1] = x>>8;
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p = buf;
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isextended = 0;
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dot = nil;
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ndot = 0;
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while(c = (uchar)*p){
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if(c&0x80) /* UTF8 */
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isextended = 1;
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else if(c == '.'){
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dot = p;
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ndot++;
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}else if(strchr("+,:;=[] ", c))
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isextended = 1;
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p++;
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}
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is8dot3 = (ndot==0 && p-buf <= 8) || (ndot==1 && dot-buf <= 8 && p-(dot+1) <= 3);
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return isextended || !is8dot3;
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}
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void
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putnamesect(uchar *slot, Rune *longname, int curslot, int first, int sum)
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{
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Rune r;
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Dosdir ds;
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int i, j;
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memset(&ds, 0xff, sizeof ds);
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ds.attr = 0xf;
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ds.reserved[0] = 0;
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ds.reserved[1] = sum;
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ds.start[0] = 0;
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ds.start[1] = 0;
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if(first)
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ds.name[0] = 0x40 | curslot;
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else
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ds.name[0] = curslot;
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memmove(slot, &ds, DOSDIRSIZE);
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j = (curslot-1) * DOSRUNE;
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for(i = 1; i < 11; i += 2){
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r = longname[j++];
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slot[i] = r;
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slot[i+1] = r >> 8;
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if(r == 0)
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return;
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}
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for(i = 14; i < 26; i += 2){
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r = longname[j++];
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slot[i] = r;
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slot[i+1] = r >> 8;
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if(r == 0)
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return;
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}
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for(i = 28; i < 32; i += 2){
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r = longname[j++];
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slot[i] = r;
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slot[i+1] = r >> 8;
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if(r == 0)
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return;
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}
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}
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int
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isdoschar(int c)
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{
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if(c <= 0)
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return 0;
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if(c >= 'a' && c <= 'z')
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return 1;
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if(c >= 'A' && c <= 'Z')
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return 1;
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if(c >= '0' && c <= '9')
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return 1;
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return strchr("$%'-_@~`!(){}^#&", c) != nil;
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}
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/*
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* make an alias for a valid long file name
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*/
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void
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mkalias(char *name, char *sname, int id)
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{
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Rune r;
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char *s, *e, sid[10];
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int i, esuf, v;
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e = strrchr(name, '.');
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if(e == nil)
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e = strchr(name, '\0');
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s = name;
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i = 0;
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while(s < e && i < 6){
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if(isdoschar(*s))
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sname[i++] = *s++;
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else
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s += chartorune(&r, s);
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}
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v = snprint(sid, 10, "%d", id);
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if(i + 1 + v > 8)
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i = 8 - 1 - v;
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sname[i++] = '~';
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strcpy(&sname[i], sid);
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i += v;
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sname[i++] = '.';
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esuf = i + 3;
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while(*e && i < esuf){
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if(isdoschar(*e))
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sname[i++] = *e++;
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else
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e += chartorune(&r, e);
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}
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if(sname[i-1] == '.')
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i--;
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sname[i] = '\0';
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}
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uchar*
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addrname(uchar *entry, Dir *dir, char *name, ulong start)
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{
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char *s;
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@ -912,6 +1043,34 @@ addrname(uchar *entry, Dir *dir, char *name, ulong start)
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s = name;
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d = (Dosdir*)entry;
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if(islongname(s)){
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Rune longname[DOSNAMELEN] = {0};
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char shortname[13] = {0};
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static int aliasid;
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int i, len, sum;
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uchar *slot;
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mkalias(s, shortname, aliasid++);
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putname(shortname, d);
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sum = 0;
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for(i = 0; i < 11; i++)
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sum = (((sum&1)<<7) | ((sum&0xfe)>>1)) + d->name[i];
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sum &= 0xFF;
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len = 0;
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while(*s && len < DOSNAMELEN)
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s += chartorune(&longname[len++], s);
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slot = (uchar*)d;
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len = (len + DOSRUNE-1) / DOSRUNE;
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for(i = 0; i < len; i++){
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putnamesect(slot, longname, len - i, i == 0, sum);
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slot += DOSDIRSIZE;
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}
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d = (Dosdir*)slot;
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s = shortname;
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}
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putname(s, d);
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if(cistrcmp(s, "9load") == 0 || cistrncmp(s, "9boot", 5) == 0)
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d->attr = DSYSTEM;
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@ -924,4 +1083,5 @@ addrname(uchar *entry, Dir *dir, char *name, ulong start)
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d->length[1] = dir->length>>8;
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d->length[2] = dir->length>>16;
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d->length[3] = dir->length>>24;
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return (uchar*)d;
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}
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