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* Datasets becomes the new trunk and retires after that :-)
author mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
date Sun, 29 Jun 2008 18:44:17 +0000
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-1:000000000000 0:4a0efb7baf70
1 /*
2 * pnm2png.c --- conversion from PBM/PGM/PPM-file to PNG-file
3 * copyright (C) 1999 by Willem van Schaik <willem@schaik.com>
4 *
5 * version 1.0 - 1999.10.15 - First version.
6 *
7 * Permission to use, copy, modify, and distribute this software and
8 * its documentation for any purpose and without fee is hereby granted,
9 * provided that the above copyright notice appear in all copies and
10 * that both that copyright notice and this permission notice appear in
11 * supporting documentation. This software is provided "as is" without
12 * express or implied warranty.
13 */
14
15 #include <stdio.h>
16 #include <stdlib.h>
17 #ifdef __TURBOC__
18 #include <mem.h>
19 #include <fcntl.h>
20 #endif
21
22 #ifndef BOOL
23 #define BOOL unsigned char
24 #endif
25 #ifndef TRUE
26 #define TRUE (BOOL) 1
27 #endif
28 #ifndef FALSE
29 #define FALSE (BOOL) 0
30 #endif
31
32 #define STDIN 0
33 #define STDOUT 1
34 #define STDERR 2
35
36 /* to make pnm2png verbose so we can find problems (needs to be before png.h) */
37 #ifndef PNG_DEBUG
38 #define PNG_DEBUG 0
39 #endif
40
41 #include "png.h"
42
43 /* Define png_jmpbuf() in case we are using a pre-1.0.6 version of libpng */
44 #ifndef png_jmpbuf
45 # define png_jmpbuf(png_ptr) ((png_ptr)->jmpbuf)
46 #endif
47
48 /* function prototypes */
49
50 int main (int argc, char *argv[]);
51 void usage ();
52 BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace, BOOL alpha);
53 void get_token(FILE *pnm_file, char *token);
54 png_uint_32 get_data (FILE *pnm_file, int depth);
55 png_uint_32 get_value (FILE *pnm_file, int depth);
56
57 /*
58 * main
59 */
60
61 int main(int argc, char *argv[])
62 {
63 FILE *fp_rd = stdin;
64 FILE *fp_al = NULL;
65 FILE *fp_wr = stdout;
66 BOOL interlace = FALSE;
67 BOOL alpha = FALSE;
68 int argi;
69
70 for (argi = 1; argi < argc; argi++)
71 {
72 if (argv[argi][0] == '-')
73 {
74 switch (argv[argi][1])
75 {
76 case 'i':
77 interlace = TRUE;
78 break;
79 case 'a':
80 alpha = TRUE;
81 argi++;
82 if ((fp_al = fopen (argv[argi], "rb")) == NULL)
83 {
84 fprintf (stderr, "PNM2PNG\n");
85 fprintf (stderr, "Error: alpha-channel file %s does not exist\n",
86 argv[argi]);
87 exit (1);
88 }
89 break;
90 case 'h':
91 case '?':
92 usage();
93 exit(0);
94 break;
95 default:
96 fprintf (stderr, "PNM2PNG\n");
97 fprintf (stderr, "Error: unknown option %s\n", argv[argi]);
98 usage();
99 exit(1);
100 break;
101 } /* end switch */
102 }
103 else if (fp_rd == stdin)
104 {
105 if ((fp_rd = fopen (argv[argi], "rb")) == NULL)
106 {
107 fprintf (stderr, "PNM2PNG\n");
108 fprintf (stderr, "Error: file %s does not exist\n", argv[argi]);
109 exit (1);
110 }
111 }
112 else if (fp_wr == stdout)
113 {
114 if ((fp_wr = fopen (argv[argi], "wb")) == NULL)
115 {
116 fprintf (stderr, "PNM2PNG\n");
117 fprintf (stderr, "Error: can not create PNG-file %s\n", argv[argi]);
118 exit (1);
119 }
120 }
121 else
122 {
123 fprintf (stderr, "PNM2PNG\n");
124 fprintf (stderr, "Error: too many parameters\n");
125 usage();
126 exit (1);
127 }
128 } /* end for */
129
130 #ifdef __TURBOC__
131 /* set stdin/stdout to binary, we're reading the PNM always! in binary format */
132 if (fp_rd == stdin)
133 {
134 setmode (STDIN, O_BINARY);
135 }
136 if (fp_wr == stdout)
137 {
138 setmode (STDOUT, O_BINARY);
139 }
140 #endif
141
142 /* call the conversion program itself */
143 if (pnm2png (fp_rd, fp_wr, fp_al, interlace, alpha) == FALSE)
144 {
145 fprintf (stderr, "PNM2PNG\n");
146 fprintf (stderr, "Error: unsuccessful converting to PNG-image\n");
147 exit (1);
148 }
149
150 /* close input file */
151 fclose (fp_rd);
152 /* close output file */
153 fclose (fp_wr);
154 /* close alpha file */
155 if (alpha)
156 fclose (fp_al);
157
158 return 0;
159 }
160
161 /*
162 * usage
163 */
164
165 void usage()
166 {
167 fprintf (stderr, "PNM2PNG\n");
168 fprintf (stderr, " by Willem van Schaik, 1999\n");
169 #ifdef __TURBOC__
170 fprintf (stderr, " for Turbo-C and Borland-C compilers\n");
171 #else
172 fprintf (stderr, " for Linux (and Unix) compilers\n");
173 #endif
174 fprintf (stderr, "Usage: pnm2png [options] <file>.<pnm> [<file>.png]\n");
175 fprintf (stderr, " or: ... | pnm2png [options]\n");
176 fprintf (stderr, "Options:\n");
177 fprintf (stderr, " -i[nterlace] write png-file with interlacing on\n");
178 fprintf (stderr, " -a[lpha] <file>.pgm read PNG alpha channel as pgm-file\n");
179 fprintf (stderr, " -h | -? print this help-information\n");
180 }
181
182 /*
183 * pnm2png
184 */
185
186 BOOL pnm2png (FILE *pnm_file, FILE *png_file, FILE *alpha_file, BOOL interlace, BOOL alpha)
187 {
188 png_struct *png_ptr = NULL;
189 png_info *info_ptr = NULL;
190 png_byte *png_pixels = NULL;
191 png_byte **row_pointers = NULL;
192 png_byte *pix_ptr = NULL;
193 png_uint_32 row_bytes;
194
195 char type_token[16];
196 char width_token[16];
197 char height_token[16];
198 char maxval_token[16];
199 int color_type;
200 png_uint_32 width, alpha_width;
201 png_uint_32 height, alpha_height;
202 png_uint_32 maxval;
203 int bit_depth = 0;
204 int channels;
205 int alpha_depth = 0;
206 int alpha_present;
207 int row, col;
208 BOOL raw, alpha_raw = FALSE;
209 png_uint_32 tmp16;
210 int i;
211
212 /* read header of PNM file */
213
214 get_token(pnm_file, type_token);
215 if (type_token[0] != 'P')
216 {
217 return FALSE;
218 }
219 else if ((type_token[1] == '1') || (type_token[1] == '4'))
220 {
221 raw = (type_token[1] == '4');
222 color_type = PNG_COLOR_TYPE_GRAY;
223 bit_depth = 1;
224 }
225 else if ((type_token[1] == '2') || (type_token[1] == '5'))
226 {
227 raw = (type_token[1] == '5');
228 color_type = PNG_COLOR_TYPE_GRAY;
229 get_token(pnm_file, width_token);
230 sscanf (width_token, "%lu", &width);
231 get_token(pnm_file, height_token);
232 sscanf (height_token, "%lu", &height);
233 get_token(pnm_file, maxval_token);
234 sscanf (maxval_token, "%lu", &maxval);
235 if (maxval <= 1)
236 bit_depth = 1;
237 else if (maxval <= 3)
238 bit_depth = 2;
239 else if (maxval <= 15)
240 bit_depth = 4;
241 else if (maxval <= 255)
242 bit_depth = 8;
243 else /* if (maxval <= 65535) */
244 bit_depth = 16;
245 }
246 else if ((type_token[1] == '3') || (type_token[1] == '6'))
247 {
248 raw = (type_token[1] == '6');
249 color_type = PNG_COLOR_TYPE_RGB;
250 get_token(pnm_file, width_token);
251 sscanf (width_token, "%lu", &width);
252 get_token(pnm_file, height_token);
253 sscanf (height_token, "%lu", &height);
254 get_token(pnm_file, maxval_token);
255 sscanf (maxval_token, "%lu", &maxval);
256 if (maxval <= 1)
257 bit_depth = 1;
258 else if (maxval <= 3)
259 bit_depth = 2;
260 else if (maxval <= 15)
261 bit_depth = 4;
262 else if (maxval <= 255)
263 bit_depth = 8;
264 else /* if (maxval <= 65535) */
265 bit_depth = 16;
266 }
267 else
268 {
269 return FALSE;
270 }
271
272 /* read header of PGM file with alpha channel */
273
274 if (alpha)
275 {
276 if (color_type == PNG_COLOR_TYPE_GRAY)
277 color_type = PNG_COLOR_TYPE_GRAY_ALPHA;
278 if (color_type == PNG_COLOR_TYPE_RGB)
279 color_type = PNG_COLOR_TYPE_RGB_ALPHA;
280
281 get_token(alpha_file, type_token);
282 if (type_token[0] != 'P')
283 {
284 return FALSE;
285 }
286 else if ((type_token[1] == '2') || (type_token[1] == '5'))
287 {
288 alpha_raw = (type_token[1] == '5');
289 get_token(alpha_file, width_token);
290 sscanf (width_token, "%lu", &alpha_width);
291 if (alpha_width != width)
292 return FALSE;
293 get_token(alpha_file, height_token);
294 sscanf (height_token, "%lu", &alpha_height);
295 if (alpha_height != height)
296 return FALSE;
297 get_token(alpha_file, maxval_token);
298 sscanf (maxval_token, "%lu", &maxval);
299 if (maxval <= 1)
300 alpha_depth = 1;
301 else if (maxval <= 3)
302 alpha_depth = 2;
303 else if (maxval <= 15)
304 alpha_depth = 4;
305 else if (maxval <= 255)
306 alpha_depth = 8;
307 else /* if (maxval <= 65535) */
308 alpha_depth = 16;
309 if (alpha_depth != bit_depth)
310 return FALSE;
311 }
312 else
313 {
314 return FALSE;
315 }
316 } /* end if alpha */
317
318 /* calculate the number of channels and store alpha-presence */
319 if (color_type == PNG_COLOR_TYPE_GRAY)
320 channels = 1;
321 else if (color_type == PNG_COLOR_TYPE_GRAY_ALPHA)
322 channels = 2;
323 else if (color_type == PNG_COLOR_TYPE_RGB)
324 channels = 3;
325 else if (color_type == PNG_COLOR_TYPE_RGB_ALPHA)
326 channels = 4;
327 else
328 channels = 0; /* should not happen */
329
330 alpha_present = (channels - 1) % 2;
331
332 /* row_bytes is the width x number of channels x (bit-depth / 8) */
333 row_bytes = width * channels * ((bit_depth <= 8) ? 1 : 2);
334
335 if ((png_pixels = (png_byte *) malloc (row_bytes * height * sizeof (png_byte))) == NULL)
336 return FALSE;
337
338 /* read data from PNM file */
339 pix_ptr = png_pixels;
340
341 for (row = 0; row < height; row++)
342 {
343 for (col = 0; col < width; col++)
344 {
345 for (i = 0; i < (channels - alpha_present); i++)
346 {
347 if (raw)
348 *pix_ptr++ = get_data (pnm_file, bit_depth);
349 else
350 if (bit_depth <= 8)
351 *pix_ptr++ = get_value (pnm_file, bit_depth);
352 else
353 {
354 tmp16 = get_value (pnm_file, bit_depth);
355 *pix_ptr = (png_byte) ((tmp16 >> 8) & 0xFF);
356 pix_ptr++;
357 *pix_ptr = (png_byte) (tmp16 & 0xFF);
358 pix_ptr++;
359 }
360 }
361
362 if (alpha) /* read alpha-channel from pgm file */
363 {
364 if (alpha_raw)
365 *pix_ptr++ = get_data (alpha_file, alpha_depth);
366 else
367 if (alpha_depth <= 8)
368 *pix_ptr++ = get_value (alpha_file, bit_depth);
369 else
370 {
371 tmp16 = get_value (alpha_file, bit_depth);
372 *pix_ptr++ = (png_byte) ((tmp16 >> 8) & 0xFF);
373 *pix_ptr++ = (png_byte) (tmp16 & 0xFF);
374 }
375 } /* if alpha */
376
377 } /* end for col */
378 } /* end for row */
379
380 /* prepare the standard PNG structures */
381 png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
382 if (!png_ptr)
383 {
384 return FALSE;
385 }
386 info_ptr = png_create_info_struct (png_ptr);
387 if (!info_ptr)
388 {
389 png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
390 return FALSE;
391 }
392
393 /* setjmp() must be called in every function that calls a PNG-reading libpng function */
394 if (setjmp (png_jmpbuf(png_ptr)))
395 {
396 png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
397 return FALSE;
398 }
399
400 /* initialize the png structure */
401 png_init_io (png_ptr, png_file);
402
403 /* we're going to write more or less the same PNG as the input file */
404 png_set_IHDR (png_ptr, info_ptr, width, height, bit_depth, color_type,
405 (!interlace) ? PNG_INTERLACE_NONE : PNG_INTERLACE_ADAM7,
406 PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_BASE);
407
408 /* write the file header information */
409 png_write_info (png_ptr, info_ptr);
410
411 /* if needed we will allocate memory for an new array of row-pointers */
412 if (row_pointers == (unsigned char**) NULL)
413 {
414 if ((row_pointers = (png_byte **) malloc (height * sizeof (png_bytep))) == NULL)
415 {
416 png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
417 return FALSE;
418 }
419 }
420
421 /* set the individual row_pointers to point at the correct offsets */
422 for (i = 0; i < (height); i++)
423 row_pointers[i] = png_pixels + i * row_bytes;
424
425 /* write out the entire image data in one call */
426 png_write_image (png_ptr, row_pointers);
427
428 /* write the additional chuncks to the PNG file (not really needed) */
429 png_write_end (png_ptr, info_ptr);
430
431 /* clean up after the write, and free any memory allocated */
432 png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
433
434 if (row_pointers != (unsigned char**) NULL)
435 free (row_pointers);
436 if (png_pixels != (unsigned char*) NULL)
437 free (png_pixels);
438
439 return TRUE;
440 } /* end of pnm2png */
441
442 /*
443 * get_token() - gets the first string after whitespace
444 */
445
446 void get_token(FILE *pnm_file, char *token)
447 {
448 int i = 0;
449
450 /* remove white-space */
451 do
452 {
453 token[i] = (unsigned char) fgetc (pnm_file);
454 }
455 while ((token[i] == '\n') || (token[i] == '\r') || (token[i] == ' '));
456
457 /* read string */
458 do
459 {
460 i++;
461 token[i] = (unsigned char) fgetc (pnm_file);
462 }
463 while ((token[i] != '\n') && (token[i] != '\r') && (token[i] != ' '));
464
465 token[i] = '\0';
466
467 return;
468 }
469
470 /*
471 * get_data() - takes first byte and converts into next pixel value,
472 * taking as much bits as defined by bit-depth and
473 * using the bit-depth to fill up a byte (0Ah -> AAh)
474 */
475
476 png_uint_32 get_data (FILE *pnm_file, int depth)
477 {
478 static int bits_left = 0;
479 static int old_value = 0;
480 static int mask = 0;
481 int i;
482 png_uint_32 ret_value;
483
484 if (mask == 0)
485 for (i = 0; i < depth; i++)
486 mask = (mask >> 1) | 0x80;
487
488 if (bits_left <= 0)
489 {
490 old_value = fgetc (pnm_file);
491 bits_left = 8;
492 }
493
494 ret_value = old_value & mask;
495 for (i = 1; i < (8 / depth); i++)
496 ret_value = ret_value || (ret_value >> depth);
497
498 old_value = (old_value << depth) & 0xFF;
499 bits_left -= depth;
500
501 return ret_value;
502 }
503
504 /*
505 * get_value() - takes first (numeric) string and converts into number,
506 * using the bit-depth to fill up a byte (0Ah -> AAh)
507 */
508
509 png_uint_32 get_value (FILE *pnm_file, int depth)
510 {
511 static png_uint_32 mask = 0;
512 png_byte token[16];
513 png_uint_32 ret_value;
514 int i = 0;
515
516 if (mask == 0)
517 for (i = 0; i < depth; i++)
518 mask = (mask << 1) | 0x01;
519
520 get_token (pnm_file, (char *) token);
521 sscanf ((const char *) token, "%lu", &ret_value);
522
523 ret_value &= mask;
524
525 if (depth < 8)
526 for (i = 0; i < (8 / depth); i++)
527 ret_value = (ret_value << depth) || ret_value;
528
529 return ret_value;
530 }
531
532 /* end of source */
533