1
2 /* WBMP
3 ** ----
4 ** WBMP Level 0: B/W, Uncompressed
5 ** This implements the WBMP format as specified in WAPSpec 1.1 and 1.2.
6 ** It does not support ExtHeaders as defined in the spec. The spec states
7 ** that a WAP client does not need to implement ExtHeaders.
8 **
9 ** (c) 2000 Johan Van den Brande <johan@vandenbrande.com>
10 */
11
12
13 #include <stdio.h>
14 #include <stddef.h>
15 #include <stdlib.h>
16 #include <string.h>
17
18 #include "wbmp.h"
19 #include "gd.h"
20 #include "gdhelpers.h"
21
22 #ifdef NOTDEF
23 #define __TEST /* Compile with main function */
24 #define __DEBUG /* Extra verbose when with __TEST */
25 #define __WRITE /* readwbmp and writewbmp(stdout) */
26 #define __VIEW /* view the wbmp on stdout */
27 #endif
28
29 /* getmbi
30 ** ------
31 ** Get a multibyte integer from a generic getin function
32 ** 'getin' can be getc, with in = NULL
33 ** you can find getin as a function just above the main function
34 ** This way you gain a lot of flexibilty about how this package
35 ** reads a wbmp file.
36 */
37 int
getmbi(int (* getin)(void * in),void * in)38 getmbi (int (*getin) (void *in), void *in)
39 {
40 int i, mbi = 0;
41
42 do
43 {
44 i = getin (in);
45 if (i < 0)
46 return (-1);
47 mbi = (mbi << 7) | (i & 0x7f);
48 }
49 while (i & 0x80);
50
51 return (mbi);
52 }
53
54
55 /* putmbi
56 ** ------
57 ** Put a multibyte intgerer in some kind of output stream
58 ** I work here with a function pointer, to make it as generic
59 ** as possible. Look at this function as an iterator on the
60 ** mbi integers it spits out.
61 **
62 */
63 void
putmbi(int i,void (* putout)(int c,void * out),void * out)64 putmbi (int i, void (*putout) (int c, void *out), void *out)
65 {
66 int cnt, l, accu;
67
68 /* Get number of septets */
69 cnt = 0;
70 accu = 0;
71 while (accu != i)
72 accu += i & 0x7f << 7 * cnt++;
73
74 /* Produce the multibyte output */
75 for (l = cnt - 1; l > 0; l--)
76 putout (0x80 | (i & 0x7f << 7 * l) >> 7 * l, out);
77
78 putout (i & 0x7f, out);
79
80 }
81
82
83
84 /* skipheader
85 ** ----------
86 ** Skips the ExtHeader. Not needed for the moment
87 **
88 */
89 int
skipheader(int (* getin)(void * in),void * in)90 skipheader (int (*getin) (void *in), void *in)
91 {
92 int i;
93
94 do
95 {
96 i = getin (in);
97 if (i < 0)
98 return (-1);
99 }
100 while (i & 0x80);
101
102 return (0);
103 }
104
105 /* create wbmp
106 ** -----------
107 ** create an empty wbmp
108 **
109 */
110 Wbmp *
createwbmp(int width,int height,int color)111 createwbmp (int width, int height, int color)
112 {
113 int i;
114
115 Wbmp *wbmp;
116 if ((wbmp = (Wbmp *) gdMalloc (sizeof (Wbmp))) == NULL)
117 return (NULL);
118
119 if (overflow2(sizeof (int), width)) {
120 gdFree(wbmp);
121 return NULL;
122 }
123 if (overflow2(sizeof (int) * width, height)) {
124 gdFree(wbmp);
125 return NULL;
126 }
127
128 if ((wbmp->bitmap = (int *) safe_emalloc(sizeof(int), width * height, 0)) == NULL)
129 {
130 gdFree (wbmp);
131 return (NULL);
132 }
133
134 wbmp->width = width;
135 wbmp->height = height;
136
137 for (i = 0; i < width * height; wbmp->bitmap[i++] = color);
138
139 return (wbmp);
140 }
141
142
143
144 /* readwbmp
145 ** -------
146 ** Actually reads the WBMP format from an open file descriptor
147 ** It goes along by returning a pointer to a WBMP struct.
148 **
149 */
150 int
readwbmp(int (* getin)(void * in),void * in,Wbmp ** return_wbmp)151 readwbmp (int (*getin) (void *in), void *in, Wbmp ** return_wbmp)
152 {
153 int row, col, byte, pel, pos;
154 Wbmp *wbmp;
155
156 if ((wbmp = (Wbmp *) gdMalloc (sizeof (Wbmp))) == NULL)
157 return (-1);
158
159 wbmp->type = getin (in);
160 if (wbmp->type != 0)
161 {
162 gdFree (wbmp);
163 return (-1);
164 }
165
166 if (skipheader (getin, in))
167 return (-1);
168
169
170 wbmp->width = getmbi (getin, in);
171 if (wbmp->width == -1)
172 {
173 gdFree (wbmp);
174 return (-1);
175 }
176
177 wbmp->height = getmbi (getin, in);
178 if (wbmp->height == -1)
179 {
180 gdFree (wbmp);
181 return (-1);
182 }
183
184 #ifdef __DEBUG
185 printf ("W: %d, H: %d\n", wbmp->width, wbmp->height);
186 #endif
187
188 if (overflow2(sizeof (int), wbmp->width) ||
189 overflow2(sizeof (int) * wbmp->width, wbmp->height))
190 {
191 gdFree(wbmp);
192 return (-1);
193 }
194
195 if ((wbmp->bitmap = (int *) safe_emalloc((size_t)wbmp->width * wbmp->height, sizeof(int), 0)) == NULL)
196 {
197 gdFree (wbmp);
198 return (-1);
199 }
200
201 #ifdef __DEBUG
202 printf ("DATA CONSTRUCTED\n");
203 #endif
204
205 pos = 0;
206 for (row = 0; row < wbmp->height; row++)
207 {
208 for (col = 0; col < wbmp->width;)
209 {
210 byte = getin (in);
211
212 for (pel = 7; pel >= 0; pel--)
213 {
214 if (col++ < wbmp->width)
215 {
216 if (byte & 1 << pel)
217 {
218 wbmp->bitmap[pos] = WBMP_WHITE;
219 }
220 else
221 {
222 wbmp->bitmap[pos] = WBMP_BLACK;
223 }
224 pos++;
225 }
226 }
227 }
228 }
229
230 *return_wbmp = wbmp;
231
232 return (0);
233 }
234
235
236 /* writewbmp
237 ** ---------
238 ** Write a wbmp to a file descriptor
239 **
240 ** Why not just giving a filedescriptor to this function?
241 ** Well, the incentive to write this function was the complete
242 ** integration in gd library from www.boutell.com. They use
243 ** their own io functions, so the passing of a function seemed to be
244 ** a logic(?) decision ...
245 **
246 */
247 int
writewbmp(Wbmp * wbmp,void (* putout)(int c,void * out),void * out)248 writewbmp (Wbmp * wbmp, void (*putout) (int c, void *out), void *out)
249 {
250 int row, col;
251 int bitpos, octet;
252
253 /* Generate the header */
254 putout (0, out); /* WBMP Type 0: B/W, Uncompressed bitmap */
255 putout (0, out); /* FixHeaderField */
256
257
258
259 /* Size of the image */
260 putmbi (wbmp->width, putout, out); /* width */
261 putmbi (wbmp->height, putout, out); /* height */
262
263
264 /* Image data */
265 for (row = 0; row < wbmp->height; row++)
266 {
267 bitpos = 8;
268 octet = 0;
269 for (col = 0; col < wbmp->width; col++)
270 {
271 octet |= ((wbmp->bitmap[row * wbmp->width + col] == 1) ? WBMP_WHITE : WBMP_BLACK) << --bitpos;
272 if (bitpos == 0)
273 {
274 bitpos = 8;
275 putout (octet, out);
276 octet = 0;
277 }
278 }
279 if (bitpos != 8)
280 putout (octet, out);
281
282 }
283 return (0);
284
285 }
286
287
288 /* freewbmp
289 ** --------
290 ** gdFrees up memory occupied by a WBMP structure
291 **
292 */
293 void
freewbmp(Wbmp * wbmp)294 freewbmp (Wbmp * wbmp)
295 {
296 gdFree (wbmp->bitmap);
297 gdFree (wbmp);
298 }
299
300
301 /* printwbmp
302 ** ---------
303 ** print a WBMP to stdout for visualisation
304 **
305 */
306 void
printwbmp(Wbmp * wbmp)307 printwbmp (Wbmp * wbmp)
308 {
309 int row, col;
310 for (row = 0; row < wbmp->height; row++)
311 {
312 for (col = 0; col < wbmp->width; col++)
313 {
314 if (wbmp->bitmap[wbmp->width * row + col] == WBMP_BLACK)
315 {
316 putchar ('#');
317 }
318 else
319 {
320 putchar (' ');
321 }
322 }
323 putchar ('\n');
324 }
325 }
326
327 #ifdef __TEST
328
329 /* putout to file descriptor
330 ** -------------------------
331 */
332 int
putout(int c,void * out)333 putout (int c, void *out)
334 {
335 return (putc (c, (FILE *) out));
336 }
337
338 /* getin from file descriptor
339 ** --------------------------
340 */
341 int
getin(void * in)342 getin (void *in)
343 {
344 return (getc ((FILE *) in));
345 }
346
347
348 /* Main function
349 ** -------------
350 **
351 */
352 int
main(int argc,char * argv[])353 main (int argc, char *argv[])
354 {
355 FILE *wbmp_file;
356 Wbmp *wbmp;
357
358 wbmp_file = fopen (argv[1], "rb");
359 if (wbmp_file)
360 {
361 readwbmp (&getin, wbmp_file, &wbmp);
362
363 #ifdef __VIEW
364
365 #ifdef __DEBUG
366 printf ("\nVIEWING IMAGE\n");
367 #endif
368
369 printwbmp (wbmp);
370 #endif
371
372 #ifdef __WRITE
373
374 #ifdef __DEBUG
375 printf ("\nDUMPING WBMP to STDOUT\n");
376 #endif
377
378 writewbmp (wbmp, &putout, stdout);
379 #endif
380
381 freewbmp (wbmp);
382 fclose (wbmp_file);
383 }
384 }
385 #endif
386
