1 #include	<u.h>
2 #include	<libc.h>
3 #include	<libg.h>
4 #include	<bio.h>
5 #include	"hdr.h"
6 
7 /*
8 	this file reads bdf fonts. it is mapping dependent in that the ENCODING
9 	field is font dependent.
10 */
11 
12 static char *field(Biobuf *, char *);
13 
14 Bitmap *
15 greadbits(char *file, int n, long *chars, int size, uchar *bits, int **doneptr)
16 {
17 	Bitmap *bm;
18 	Biobuf *bf;
19 	char *p, *s;
20 	long kmin, kmax;
21 	int i, j, byt;
22 	int nch;
23 	long c;
24 	uchar *b;
25 	int *done;
26 	uchar *nbits;
27 	char buf[1024];	/* big enough for one char! */
28 	static int dig[256] = {
29 	['0'] 0, ['1'] 1, ['2'] 2, ['3'] 3, ['4'] 4, ['5'] 5, ['6'] 6, ['7'] 7,
30 	['8'] 8, ['9'] 9, ['a'] 10, ['b'] 11, ['c'] 12, ['d'] 13, ['e'] 14, ['f'] 15,
31 	};
32 
33 	bf = Bopen(file, OREAD);
34 	if(bf == 0){
35 		fprint(2, "%s: %s: %r\n", argv0, file);
36 		exits("bitfile open error");
37 	}
38 	done = (int *)malloc(n*sizeof(done[0]));
39 	if(done == 0){
40 		fprint(2, "%s: malloc error (%d bytes)\n", argv0, n);
41 		exits("malloc error");
42 	}
43 	*doneptr = done;
44 	memset(done, 0, n*sizeof(done[0]));
45 	kmin = 65536;
46 	kmax = 0;
47 	for(i = 0; i < n; i++){
48 		c = chars[i];
49 		if(kmin > c)
50 			kmin = c;
51 		if(kmax < c)
52 			kmax = c;
53 	}
54 	nch = 0;
55 	byt = size/8;
56 	for(;;){
57 		while(s = Brdline(bf, '\n')){
58 			if(strncmp(s, "STARTCHAR", 9) == 0)
59 				break;
60 		}
61 		if(s == 0)
62 			break;
63 		s = field(bf, "ENCODING");
64 		c = strtol(s, (char **)0, 10);
65 		c = (c/256 - 0xA0)*100 + (c%256 - 0xA0);
66 		field(bf, "BITMAP");
67 		p = buf;
68 		for(i = 0; i < size; i++){	/* rows */
69 			if((s = Brdline(bf, '\n')) == 0){
70 				exits("bad bdf");
71 			}
72 			memcpy(p, s, 2*byt);
73 			p += 2*byt;
74 		}
75 		field(bf, "ENDCHAR");
76 		if((c < kmin) || (c > kmax))
77 			continue;
78 		for(i = 0; i < n; i++)
79 			if(c == chars[i]){
80 				nch++;
81 				done[i] = 1;
82 				p = buf;
83 				b = bits + i*byt;
84 				for(i = 0; i < size; i++){	/* rows */
85 					for(j = 0; j < byt; j++){
86 						*b++ = (dig[*p]<<4) | dig[p[1]];
87 						p += 2;
88 					}
89 					b += (n-1)*byt;
90 				}
91 				break;
92 			}
93 	}
94 	nbits = (uchar *)malloc(nch*byt*size);
95 	if(nbits == 0){
96 		fprint(2, "%s: malloc error (%d bytes)\n", argv0, nch*byt);
97 		exits("malloc error");
98 	}
99 	c = 0;
100 	for(i = 0; i < n; i++)
101 		if(done[i]){
102 			for(j = 0; j < size; j++)
103 				memmove(nbits+c*byt+j*nch*byt, bits+i*byt+j*n*byt, byt);
104 			c++;
105 		}
106 	bm = balloc((Rectangle){(Point){0, 0}, (Point){nch*size, size}}, 0);
107 	if(bm == 0){
108 		fprint(2, "%s: balloc failure\n", argv0);
109 		exits("balloc failure");
110 	}
111 	wrbitmap(bm, 0, size, nbits);
112 	for(i = 0; i < n; i++)
113 		if(done[i] == 0){
114 			/*fprint(2, "char 0x%x (%d) not found\n", chars[i], chars[i]);/**/
115 		}
116 	return(bm);
117 }
118 
119 static char *
120 field(Biobuf *bf, char *name)
121 {
122 	char *s;
123 	int n;
124 
125 	n = strlen(name);
126 	while(s = Brdline(bf, '\n')){
127 		if(strncmp(s, name, n) == 0)
128 			return(s+n);
129 		if(strncmp(s, "ENDCHAR", 7) == 0){
130 			fprint(2, "%s: char missing %s field\n", argv0, name);
131 			exits("bad bdf");
132 		}
133 	}
134 	fprint(2, "%s: char missing %s field; unexpected EOF\n", argv0, name);
135 	exits("bad bdf");
136 	return(0);
137 }