xref: /PHP-5.3/ext/gd/libgd/wbmp.c (revision cb11ba76)
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