1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
|
#include <stdio.h>
#include <rasterfile.h>
/*
* RAS2TEXT -- This is a small standalone utility program to convert a color
* Sun rasterfile to a printable ASCII form suitable for inclusion as an image
* in a GUI. The dimensions of the raster are output, along with the RGB
* colortable and the hex-encoded and optionally run length encoded pixels.
*
* Usage: ras2text [-hex1 | -hex2] [-rle] fname
*
* The decoded Sun raster is written as text to the standard output.
*/
#define HEX1 1
#define HEX2 2
struct color {
unsigned char red, green, blue;
};
main (argc, argv)
int argc;
char **argv;
{
register unsigned char *op;
register unsigned char *ip;
register int i, j, v;
struct rasterfile r;
struct color colors[256];
unsigned char red[256], green[256], blue[256];
unsigned char hex1[256], hex2[256*2];
unsigned char *data, *obuf, *cbuf;
int encoding, compress, debug;
int fd, npix, nelem, maxval, n;
char *fname;
fname = NULL;
encoding = HEX2;
compress = 0;
debug = 0;
/* Process argument list. */
for (i=1; i < argc; i++)
if (argv[i][0] == '-') {
if (strcmp (argv[i], "-hex1") == 0)
encoding = HEX1;
else if (strcmp (argv[i], "-hex2") == 0)
encoding = HEX2;
else if (strcmp (argv[i], "-rle") == 0)
compress++;
else if (strcmp (argv[i], "-d") == 0)
debug++;
else
fprintf (stderr, "unknown switch %s\n", argv[i]);
} else
fname = argv[i];
/* Open file. */
if ((fd = open (fname, 0)) < 0) {
fprintf (stderr, "cannot open %s\n", fname);
exit (1);
}
/* Read file header. */
if (read(fd,&r,sizeof(r)) != sizeof(r) || r.ras_magic != RAS_MAGIC) {
fprintf (stderr, "not a Sun rasterfile: %s\n", fname);
exit (2);
}
/* Print header. */
printf ("width %d height %d depth %d\n",
r.ras_width, r.ras_height, r.ras_depth);
if (debug) {
fprintf (stderr, "width=%d height=%d depth=%d length=%d type=%d\n",
r.ras_width, r.ras_height, r.ras_depth, r.ras_length,
r.ras_type);
fprintf (stderr, "maptype=%d, maplength=%d\n",
r.ras_maptype, r.ras_maplength);
}
if (r.ras_type != RT_STANDARD) {
fprintf (stderr, "rasterfile not in standard format\n");
exit (3);
}
/* Read the colormap. */
if (n = r.ras_maplength / 3) {
if (read (fd, red, n) != n ||
read (fd, green, n) != n ||
read (fd, blue, n) != n) {
fprintf (stderr, "cannot read colormap\n");
exit (4);
}
}
/* Read the pixels. */
if ((data = (unsigned char *) malloc (npix=r.ras_length)) == NULL) {
fprintf (stderr, "out of memory\n");
exit (5);
}
if ((npix = read(fd,data,npix)) != r.ras_length) {
fprintf (stderr, "data read error\n");
exit (6);
}
/* If bitmap convert to byte pixel array. */
if (r.ras_depth == 1) {
unsigned char *bits = data;
npix = r.ras_width * r.ras_height;
if ((data = (unsigned char *) malloc (npix)) == NULL) {
fprintf (stderr, "out of memory\n");
exit (5);
}
for (i=0, op=data; i < npix; i++)
*op++ = !((bits[i/8] & (1 << (7 - (i % 8)))) != 0);
free (bits);
}
if ((obuf = (unsigned char *) malloc (npix*2)) == NULL) {
fprintf (stderr, "out of memory\n");
exit (5);
}
/* Find largest pixel value. */
for (i=0, maxval=v=0; i < npix; i++)
if (data[i] > v)
v = data[i];
maxval = v;
if (debug)
fprintf (stderr, "max pixel value = %d\n", maxval);
/* Print the colormap. */
n = r.ras_maplength / 3;
for (i=0; i < n; i++) {
colors[i].red = red[i];
colors[i].green = green[i];
colors[i].blue = blue[i];
}
if (n >= maxval)
n = maxval + 1;
printf ("colormap (length %d) = {\n ", nelem = n);
for (i=0, n=1; i < nelem; i++, n++) {
printf ("{%3d %3d %3d} ",
colors[i].red, colors[i].green, colors[i].blue);
if (n && n > 4) {
printf ("\n ");
n = 0;
}
}
if (n)
printf ("\n");
printf ("}\n");
if (r.ras_length <= 0) {
fprintf (stderr, "no data\n");
exit (7);
}
/* Print the pixels.
*/
/* Generate binary to hex1 (64 element) lookup table. */
for (n=0, op=hex1; n < 256; n++) {
i = (n % 64);
if (i < 10)
*op++ = i + '0';
else if (i < 36)
*op++ = (i - 10) + 'A';
else if (i < 62)
*op++ = (i - 36) + 'a';
else if (i == 62)
*op++ = '$';
else
*op++ = '_';
}
/* Generate binary to hex2 (256 element) lookup table. */
for (n=0, op=hex2; n < 256; n++) {
i = ((n >> 4) & 017);
*op++ = (i < 10) ? i + '0' : (i-10) + 'A';
i = (n & 017);
*op++ = (i < 10) ? i + '0' : (i-10) + 'A';
}
/* Hex encode the data. */
if (encoding == HEX1) {
/* Hex1 encoding uses only one character per pixel but the
* pixel range is restricted to 0 to 63.
*/
for (j=0, ip=data, op=obuf; j < r.ras_height; j++) {
for (i=0; i < r.ras_width; i++)
*op++ = hex1[*ip++];
if (r.ras_width % 2)
ip++;
}
} else if (encoding == HEX2) {
/* Hex2 encoding uses 2 characters per pixel and supports
* pixel values in the range 0 to 255.
*/
for (j=0, ip=data, op=obuf; j < r.ras_height; j++) {
for (i=0; i < r.ras_width; i++) {
v = *ip++ * 2;
*op++ = hex2[v];
*op++ = hex2[v+1];
}
if (r.ras_width % 2)
ip++;
}
}
*op = '\0';
/* Run length compress the data. The compressed data stream
* contains a mixture of literal data codes and repeat codes.
* A "@" followed by a hex1-encoded number N causes the most
* recent pixel value to be repeated N+1 times, where N < 64.
* A "%" followed by a hex2-encoded number N causes the most
* recent pixel value to be repeated N+1 times, where N < 256.
*/
if (compress) {
npix = r.ras_length;
if ((cbuf = (unsigned char *) malloc (npix*3)) == NULL) {
fprintf (stderr, "out of memory\n");
exit (8);
}
ip = obuf;
op = cbuf;
*op++ = v = *ip++;
while (*ip) {
for (n=0; n < 256 && *ip == v; ip++, n++)
;
if (n == 0) {
*op++ = v = *ip++;
} else if (n < 3) {
while (--n >= 0)
*op++ = v;
} else if (n <= 64) {
*op++ = '@';
*op++ = hex1[n-1];
} else if (n <= 256) {
*op++ = '%';
*op++ = hex2[(n-1)*2];
*op++ = hex2[(n-1)*2+1];
}
}
*op = '\0';
free (obuf);
obuf = cbuf;
}
/* Output the encoded pixel data.
*/
printf ("pixels (%s%s) = {\n ",
(encoding == HEX1) ? "hex1" : "hex2", compress ? " rle" : "");
for (ip=obuf, n=1; *ip; ip++, n++) {
putchar (*ip);
if (n && n > 72) {
printf ("\n ");
n = 0;
}
}
if (n)
printf ("\n");
printf ("}\n");
free (data);
free (obuf);
close (fd);
exit (0);
}
|
