tkbits.c - plan9port - [fork] Plan 9 from user space
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       ---
       tkbits.c (2058B)
       ---
            1 #include        <u.h>
            2 #include        <libc.h>
            3 #include        <libg.h>
            4 #include        <bio.h>
            5 #include        "hdr.h"
            6 
            7 Bitmap *
            8 kreadbits(char *file, int n, long *chars, int size, uchar *bits, int **doneptr)
            9 {
           10         Bitmap *bm;
           11         Biobuf *bf;
           12         char *p;
           13         long kmin, kmax;
           14         int i, j, byt;
           15         int nch;
           16         long c;
           17         uchar *b;
           18         int *done;
           19         uchar *nbits;
           20         static int dig[256] = {
           21         ['0'] 0, ['1'] 1, ['2'] 2, ['3'] 3, ['4'] 4, ['5'] 5, ['6'] 6, ['7'] 7,
           22         ['8'] 8, ['9'] 9, ['a'] 10, ['b'] 11, ['c'] 12, ['d'] 13, ['e'] 14, ['f'] 15,
           23         };
           24 
           25         bf = Bopen(file, OREAD);
           26         if(bf == 0){
           27                 fprint(2, "%s: %s: %r\n", argv0, file);
           28                 exits("bitfile open error");
           29         }
           30         done = (int *)malloc(n*sizeof(done[0]));
           31         if(done == 0){
           32                 fprint(2, "%s: malloc error (%d bytes)\n", argv0, n);
           33                 exits("malloc error");
           34         }
           35         *doneptr = done;
           36         memset(done, 0, n*sizeof(done[0]));
           37         kmin = 65536;
           38         kmax = 0;
           39         for(i = 0; i < n; i++){
           40                 c = chars[i];
           41                 if(kmin > c)
           42                         kmin = c;
           43                 if(kmax < c)
           44                         kmax = c;
           45         }
           46         nch = 0;
           47         byt = size/8;
           48         Brdline(bf, '\n');                /* header line 1 */
           49         Brdline(bf, '\n');                /* header line 2 */
           50         while(p = (char *)Brdline(bf, '\n')){
           51                 c = strtol(p+17, (char **)0, 10);
           52                 if((c < kmin) || (c > kmax))
           53                         continue;
           54                 for(i = 0; i < n; i++)
           55                         if(c == chars[i]){
           56                                 nch++;
           57                                 done[i] = 1;
           58                                 p += 25;
           59                                 b = bits + i*byt;
           60                                 for(i = 0; i < size; i++){        /* rows */
           61                                         for(j = 0; j < byt; j++){
           62                                                 *b++ = (dig[*p]<<4) | dig[p[1]];
           63                                                 p += 2;
           64                                         }
           65                                         b += (n-1)*byt;
           66                                 }
           67                                 break;
           68                         }
           69         }
           70         nbits = (uchar *)malloc(nch*byt*size);
           71         if(nbits == 0){
           72                 fprint(2, "%s: malloc error (%d bytes)\n", argv0, nch*byt);
           73                 exits("malloc error");
           74         }
           75         c = 0;
           76         for(i = 0; i < n; i++)
           77                 if(done[i]){
           78                         for(j = 0; j < size; j++)
           79                                 memmove(nbits+c*byt+j*nch*byt, bits+i*byt+j*n*byt, byt);
           80                         c++;
           81                 }
           82         bm = balloc((Rectangle){(Point){0, 0}, (Point){nch*size, size}}, 0);
           83         if(bm == 0){
           84                 fprint(2, "%s: balloc failure\n", argv0);
           85                 exits("balloc failure");
           86         }
           87         wrbitmap(bm, 0, size, nbits);
           88         for(i = 0; i < n; i++)
           89                 if(done[i] == 0){
           90                         /*fprint(2, "char 0x%x (%d) not found\n", chars[i], chars[i]);/**/
           91                 }
           92         return(bm);
           93 }