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author | David Walter Seikel | 2013-01-13 17:24:39 +1000 |
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committer | David Walter Seikel | 2013-01-13 17:24:39 +1000 |
commit | 393b5cd1dc438872af89d334ef6e5fcc59f27d47 (patch) | |
tree | 6a14521219942a08a1b95cb2f5a923a9edd60f63 /libraries/irrlicht-1.8/source/Irrlicht/jpeglib/rdjpgcom.c | |
parent | Add a note about rasters suggested start up code. (diff) | |
download | SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.zip SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.gz SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.bz2 SledjHamr-393b5cd1dc438872af89d334ef6e5fcc59f27d47.tar.xz |
Added Irrlicht 1.8, but without all the Windows binaries.
Diffstat (limited to '')
-rw-r--r-- | libraries/irrlicht-1.8/source/Irrlicht/jpeglib/rdjpgcom.c | 515 |
1 files changed, 515 insertions, 0 deletions
diff --git a/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/rdjpgcom.c b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/rdjpgcom.c new file mode 100644 index 0000000..ab09b44 --- /dev/null +++ b/libraries/irrlicht-1.8/source/Irrlicht/jpeglib/rdjpgcom.c | |||
@@ -0,0 +1,515 @@ | |||
1 | /* | ||
2 | * rdjpgcom.c | ||
3 | * | ||
4 | * Copyright (C) 1994-1997, Thomas G. Lane. | ||
5 | * Modified 2009 by Bill Allombert, Guido Vollbeding. | ||
6 | * This file is part of the Independent JPEG Group's software. | ||
7 | * For conditions of distribution and use, see the accompanying README file. | ||
8 | * | ||
9 | * This file contains a very simple stand-alone application that displays | ||
10 | * the text in COM (comment) markers in a JFIF file. | ||
11 | * This may be useful as an example of the minimum logic needed to parse | ||
12 | * JPEG markers. | ||
13 | */ | ||
14 | |||
15 | #define JPEG_CJPEG_DJPEG /* to get the command-line config symbols */ | ||
16 | #include "jinclude.h" /* get auto-config symbols, <stdio.h> */ | ||
17 | |||
18 | #ifdef HAVE_LOCALE_H | ||
19 | #include <locale.h> /* Bill Allombert: use locale for isprint */ | ||
20 | #endif | ||
21 | #include <ctype.h> /* to declare isupper(), tolower() */ | ||
22 | #ifdef USE_SETMODE | ||
23 | #include <fcntl.h> /* to declare setmode()'s parameter macros */ | ||
24 | /* If you have setmode() but not <io.h>, just delete this line: */ | ||
25 | #include <io.h> /* to declare setmode() */ | ||
26 | #endif | ||
27 | |||
28 | #ifdef USE_CCOMMAND /* command-line reader for Macintosh */ | ||
29 | #ifdef __MWERKS__ | ||
30 | #include <SIOUX.h> /* Metrowerks needs this */ | ||
31 | #include <console.h> /* ... and this */ | ||
32 | #endif | ||
33 | #ifdef THINK_C | ||
34 | #include <console.h> /* Think declares it here */ | ||
35 | #endif | ||
36 | #endif | ||
37 | |||
38 | #ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */ | ||
39 | #define READ_BINARY "r" | ||
40 | #else | ||
41 | #ifdef VMS /* VMS is very nonstandard */ | ||
42 | #define READ_BINARY "rb", "ctx=stm" | ||
43 | #else /* standard ANSI-compliant case */ | ||
44 | #define READ_BINARY "rb" | ||
45 | #endif | ||
46 | #endif | ||
47 | |||
48 | #ifndef EXIT_FAILURE /* define exit() codes if not provided */ | ||
49 | #define EXIT_FAILURE 1 | ||
50 | #endif | ||
51 | #ifndef EXIT_SUCCESS | ||
52 | #ifdef VMS | ||
53 | #define EXIT_SUCCESS 1 /* VMS is very nonstandard */ | ||
54 | #else | ||
55 | #define EXIT_SUCCESS 0 | ||
56 | #endif | ||
57 | #endif | ||
58 | |||
59 | |||
60 | /* | ||
61 | * These macros are used to read the input file. | ||
62 | * To reuse this code in another application, you might need to change these. | ||
63 | */ | ||
64 | |||
65 | static FILE * infile; /* input JPEG file */ | ||
66 | |||
67 | /* Return next input byte, or EOF if no more */ | ||
68 | #define NEXTBYTE() getc(infile) | ||
69 | |||
70 | |||
71 | /* Error exit handler */ | ||
72 | #define ERREXIT(msg) (fprintf(stderr, "%s\n", msg), exit(EXIT_FAILURE)) | ||
73 | |||
74 | |||
75 | /* Read one byte, testing for EOF */ | ||
76 | static int | ||
77 | read_1_byte (void) | ||
78 | { | ||
79 | int c; | ||
80 | |||
81 | c = NEXTBYTE(); | ||
82 | if (c == EOF) | ||
83 | ERREXIT("Premature EOF in JPEG file"); | ||
84 | return c; | ||
85 | } | ||
86 | |||
87 | /* Read 2 bytes, convert to unsigned int */ | ||
88 | /* All 2-byte quantities in JPEG markers are MSB first */ | ||
89 | static unsigned int | ||
90 | read_2_bytes (void) | ||
91 | { | ||
92 | int c1, c2; | ||
93 | |||
94 | c1 = NEXTBYTE(); | ||
95 | if (c1 == EOF) | ||
96 | ERREXIT("Premature EOF in JPEG file"); | ||
97 | c2 = NEXTBYTE(); | ||
98 | if (c2 == EOF) | ||
99 | ERREXIT("Premature EOF in JPEG file"); | ||
100 | return (((unsigned int) c1) << 8) + ((unsigned int) c2); | ||
101 | } | ||
102 | |||
103 | |||
104 | /* | ||
105 | * JPEG markers consist of one or more 0xFF bytes, followed by a marker | ||
106 | * code byte (which is not an FF). Here are the marker codes of interest | ||
107 | * in this program. (See jdmarker.c for a more complete list.) | ||
108 | */ | ||
109 | |||
110 | #define M_SOF0 0xC0 /* Start Of Frame N */ | ||
111 | #define M_SOF1 0xC1 /* N indicates which compression process */ | ||
112 | #define M_SOF2 0xC2 /* Only SOF0-SOF2 are now in common use */ | ||
113 | #define M_SOF3 0xC3 | ||
114 | #define M_SOF5 0xC5 /* NB: codes C4 and CC are NOT SOF markers */ | ||
115 | #define M_SOF6 0xC6 | ||
116 | #define M_SOF7 0xC7 | ||
117 | #define M_SOF9 0xC9 | ||
118 | #define M_SOF10 0xCA | ||
119 | #define M_SOF11 0xCB | ||
120 | #define M_SOF13 0xCD | ||
121 | #define M_SOF14 0xCE | ||
122 | #define M_SOF15 0xCF | ||
123 | #define M_SOI 0xD8 /* Start Of Image (beginning of datastream) */ | ||
124 | #define M_EOI 0xD9 /* End Of Image (end of datastream) */ | ||
125 | #define M_SOS 0xDA /* Start Of Scan (begins compressed data) */ | ||
126 | #define M_APP0 0xE0 /* Application-specific marker, type N */ | ||
127 | #define M_APP12 0xEC /* (we don't bother to list all 16 APPn's) */ | ||
128 | #define M_COM 0xFE /* COMment */ | ||
129 | |||
130 | |||
131 | /* | ||
132 | * Find the next JPEG marker and return its marker code. | ||
133 | * We expect at least one FF byte, possibly more if the compressor used FFs | ||
134 | * to pad the file. | ||
135 | * There could also be non-FF garbage between markers. The treatment of such | ||
136 | * garbage is unspecified; we choose to skip over it but emit a warning msg. | ||
137 | * NB: this routine must not be used after seeing SOS marker, since it will | ||
138 | * not deal correctly with FF/00 sequences in the compressed image data... | ||
139 | */ | ||
140 | |||
141 | static int | ||
142 | next_marker (void) | ||
143 | { | ||
144 | int c; | ||
145 | int discarded_bytes = 0; | ||
146 | |||
147 | /* Find 0xFF byte; count and skip any non-FFs. */ | ||
148 | c = read_1_byte(); | ||
149 | while (c != 0xFF) { | ||
150 | discarded_bytes++; | ||
151 | c = read_1_byte(); | ||
152 | } | ||
153 | /* Get marker code byte, swallowing any duplicate FF bytes. Extra FFs | ||
154 | * are legal as pad bytes, so don't count them in discarded_bytes. | ||
155 | */ | ||
156 | do { | ||
157 | c = read_1_byte(); | ||
158 | } while (c == 0xFF); | ||
159 | |||
160 | if (discarded_bytes != 0) { | ||
161 | fprintf(stderr, "Warning: garbage data found in JPEG file\n"); | ||
162 | } | ||
163 | |||
164 | return c; | ||
165 | } | ||
166 | |||
167 | |||
168 | /* | ||
169 | * Read the initial marker, which should be SOI. | ||
170 | * For a JFIF file, the first two bytes of the file should be literally | ||
171 | * 0xFF M_SOI. To be more general, we could use next_marker, but if the | ||
172 | * input file weren't actually JPEG at all, next_marker might read the whole | ||
173 | * file and then return a misleading error message... | ||
174 | */ | ||
175 | |||
176 | static int | ||
177 | first_marker (void) | ||
178 | { | ||
179 | int c1, c2; | ||
180 | |||
181 | c1 = NEXTBYTE(); | ||
182 | c2 = NEXTBYTE(); | ||
183 | if (c1 != 0xFF || c2 != M_SOI) | ||
184 | ERREXIT("Not a JPEG file"); | ||
185 | return c2; | ||
186 | } | ||
187 | |||
188 | |||
189 | /* | ||
190 | * Most types of marker are followed by a variable-length parameter segment. | ||
191 | * This routine skips over the parameters for any marker we don't otherwise | ||
192 | * want to process. | ||
193 | * Note that we MUST skip the parameter segment explicitly in order not to | ||
194 | * be fooled by 0xFF bytes that might appear within the parameter segment; | ||
195 | * such bytes do NOT introduce new markers. | ||
196 | */ | ||
197 | |||
198 | static void | ||
199 | skip_variable (void) | ||
200 | /* Skip over an unknown or uninteresting variable-length marker */ | ||
201 | { | ||
202 | unsigned int length; | ||
203 | |||
204 | /* Get the marker parameter length count */ | ||
205 | length = read_2_bytes(); | ||
206 | /* Length includes itself, so must be at least 2 */ | ||
207 | if (length < 2) | ||
208 | ERREXIT("Erroneous JPEG marker length"); | ||
209 | length -= 2; | ||
210 | /* Skip over the remaining bytes */ | ||
211 | while (length > 0) { | ||
212 | (void) read_1_byte(); | ||
213 | length--; | ||
214 | } | ||
215 | } | ||
216 | |||
217 | |||
218 | /* | ||
219 | * Process a COM marker. | ||
220 | * We want to print out the marker contents as legible text; | ||
221 | * we must guard against non-text junk and varying newline representations. | ||
222 | */ | ||
223 | |||
224 | static void | ||
225 | process_COM (int raw) | ||
226 | { | ||
227 | unsigned int length; | ||
228 | int ch; | ||
229 | int lastch = 0; | ||
230 | |||
231 | /* Bill Allombert: set locale properly for isprint */ | ||
232 | #ifdef HAVE_LOCALE_H | ||
233 | setlocale(LC_CTYPE, ""); | ||
234 | #endif | ||
235 | |||
236 | /* Get the marker parameter length count */ | ||
237 | length = read_2_bytes(); | ||
238 | /* Length includes itself, so must be at least 2 */ | ||
239 | if (length < 2) | ||
240 | ERREXIT("Erroneous JPEG marker length"); | ||
241 | length -= 2; | ||
242 | |||
243 | while (length > 0) { | ||
244 | ch = read_1_byte(); | ||
245 | if (raw) { | ||
246 | putc(ch, stdout); | ||
247 | /* Emit the character in a readable form. | ||
248 | * Nonprintables are converted to \nnn form, | ||
249 | * while \ is converted to \\. | ||
250 | * Newlines in CR, CR/LF, or LF form will be printed as one newline. | ||
251 | */ | ||
252 | } else if (ch == '\r') { | ||
253 | printf("\n"); | ||
254 | } else if (ch == '\n') { | ||
255 | if (lastch != '\r') | ||
256 | printf("\n"); | ||
257 | } else if (ch == '\\') { | ||
258 | printf("\\\\"); | ||
259 | } else if (isprint(ch)) { | ||
260 | putc(ch, stdout); | ||
261 | } else { | ||
262 | printf("\\%03o", ch); | ||
263 | } | ||
264 | lastch = ch; | ||
265 | length--; | ||
266 | } | ||
267 | printf("\n"); | ||
268 | |||
269 | /* Bill Allombert: revert to C locale */ | ||
270 | #ifdef HAVE_LOCALE_H | ||
271 | setlocale(LC_CTYPE, "C"); | ||
272 | #endif | ||
273 | } | ||
274 | |||
275 | |||
276 | /* | ||
277 | * Process a SOFn marker. | ||
278 | * This code is only needed if you want to know the image dimensions... | ||
279 | */ | ||
280 | |||
281 | static void | ||
282 | process_SOFn (int marker) | ||
283 | { | ||
284 | unsigned int length; | ||
285 | unsigned int image_height, image_width; | ||
286 | int data_precision, num_components; | ||
287 | const char * process; | ||
288 | int ci; | ||
289 | |||
290 | length = read_2_bytes(); /* usual parameter length count */ | ||
291 | |||
292 | data_precision = read_1_byte(); | ||
293 | image_height = read_2_bytes(); | ||
294 | image_width = read_2_bytes(); | ||
295 | num_components = read_1_byte(); | ||
296 | |||
297 | switch (marker) { | ||
298 | case M_SOF0: process = "Baseline"; break; | ||
299 | case M_SOF1: process = "Extended sequential"; break; | ||
300 | case M_SOF2: process = "Progressive"; break; | ||
301 | case M_SOF3: process = "Lossless"; break; | ||
302 | case M_SOF5: process = "Differential sequential"; break; | ||
303 | case M_SOF6: process = "Differential progressive"; break; | ||
304 | case M_SOF7: process = "Differential lossless"; break; | ||
305 | case M_SOF9: process = "Extended sequential, arithmetic coding"; break; | ||
306 | case M_SOF10: process = "Progressive, arithmetic coding"; break; | ||
307 | case M_SOF11: process = "Lossless, arithmetic coding"; break; | ||
308 | case M_SOF13: process = "Differential sequential, arithmetic coding"; break; | ||
309 | case M_SOF14: process = "Differential progressive, arithmetic coding"; break; | ||
310 | case M_SOF15: process = "Differential lossless, arithmetic coding"; break; | ||
311 | default: process = "Unknown"; break; | ||
312 | } | ||
313 | |||
314 | printf("JPEG image is %uw * %uh, %d color components, %d bits per sample\n", | ||
315 | image_width, image_height, num_components, data_precision); | ||
316 | printf("JPEG process: %s\n", process); | ||
317 | |||
318 | if (length != (unsigned int) (8 + num_components * 3)) | ||
319 | ERREXIT("Bogus SOF marker length"); | ||
320 | |||
321 | for (ci = 0; ci < num_components; ci++) { | ||
322 | (void) read_1_byte(); /* Component ID code */ | ||
323 | (void) read_1_byte(); /* H, V sampling factors */ | ||
324 | (void) read_1_byte(); /* Quantization table number */ | ||
325 | } | ||
326 | } | ||
327 | |||
328 | |||
329 | /* | ||
330 | * Parse the marker stream until SOS or EOI is seen; | ||
331 | * display any COM markers. | ||
332 | * While the companion program wrjpgcom will always insert COM markers before | ||
333 | * SOFn, other implementations might not, so we scan to SOS before stopping. | ||
334 | * If we were only interested in the image dimensions, we would stop at SOFn. | ||
335 | * (Conversely, if we only cared about COM markers, there would be no need | ||
336 | * for special code to handle SOFn; we could treat it like other markers.) | ||
337 | */ | ||
338 | |||
339 | static int | ||
340 | scan_JPEG_header (int verbose, int raw) | ||
341 | { | ||
342 | int marker; | ||
343 | |||
344 | /* Expect SOI at start of file */ | ||
345 | if (first_marker() != M_SOI) | ||
346 | ERREXIT("Expected SOI marker first"); | ||
347 | |||
348 | /* Scan miscellaneous markers until we reach SOS. */ | ||
349 | for (;;) { | ||
350 | marker = next_marker(); | ||
351 | switch (marker) { | ||
352 | /* Note that marker codes 0xC4, 0xC8, 0xCC are not, and must not be, | ||
353 | * treated as SOFn. C4 in particular is actually DHT. | ||
354 | */ | ||
355 | case M_SOF0: /* Baseline */ | ||
356 | case M_SOF1: /* Extended sequential, Huffman */ | ||
357 | case M_SOF2: /* Progressive, Huffman */ | ||
358 | case M_SOF3: /* Lossless, Huffman */ | ||
359 | case M_SOF5: /* Differential sequential, Huffman */ | ||
360 | case M_SOF6: /* Differential progressive, Huffman */ | ||
361 | case M_SOF7: /* Differential lossless, Huffman */ | ||
362 | case M_SOF9: /* Extended sequential, arithmetic */ | ||
363 | case M_SOF10: /* Progressive, arithmetic */ | ||
364 | case M_SOF11: /* Lossless, arithmetic */ | ||
365 | case M_SOF13: /* Differential sequential, arithmetic */ | ||
366 | case M_SOF14: /* Differential progressive, arithmetic */ | ||
367 | case M_SOF15: /* Differential lossless, arithmetic */ | ||
368 | if (verbose) | ||
369 | process_SOFn(marker); | ||
370 | else | ||
371 | skip_variable(); | ||
372 | break; | ||
373 | |||
374 | case M_SOS: /* stop before hitting compressed data */ | ||
375 | return marker; | ||
376 | |||
377 | case M_EOI: /* in case it's a tables-only JPEG stream */ | ||
378 | return marker; | ||
379 | |||
380 | case M_COM: | ||
381 | process_COM(raw); | ||
382 | break; | ||
383 | |||
384 | case M_APP12: | ||
385 | /* Some digital camera makers put useful textual information into | ||
386 | * APP12 markers, so we print those out too when in -verbose mode. | ||
387 | */ | ||
388 | if (verbose) { | ||
389 | printf("APP12 contains:\n"); | ||
390 | process_COM(raw); | ||
391 | } else | ||
392 | skip_variable(); | ||
393 | break; | ||
394 | |||
395 | default: /* Anything else just gets skipped */ | ||
396 | skip_variable(); /* we assume it has a parameter count... */ | ||
397 | break; | ||
398 | } | ||
399 | } /* end loop */ | ||
400 | } | ||
401 | |||
402 | |||
403 | /* Command line parsing code */ | ||
404 | |||
405 | static const char * progname; /* program name for error messages */ | ||
406 | |||
407 | |||
408 | static void | ||
409 | usage (void) | ||
410 | /* complain about bad command line */ | ||
411 | { | ||
412 | fprintf(stderr, "rdjpgcom displays any textual comments in a JPEG file.\n"); | ||
413 | |||
414 | fprintf(stderr, "Usage: %s [switches] [inputfile]\n", progname); | ||
415 | |||
416 | fprintf(stderr, "Switches (names may be abbreviated):\n"); | ||
417 | fprintf(stderr, " -raw Display non-printable characters in comments (unsafe)\n"); | ||
418 | fprintf(stderr, " -verbose Also display dimensions of JPEG image\n"); | ||
419 | |||
420 | exit(EXIT_FAILURE); | ||
421 | } | ||
422 | |||
423 | |||
424 | static int | ||
425 | keymatch (char * arg, const char * keyword, int minchars) | ||
426 | /* Case-insensitive matching of (possibly abbreviated) keyword switches. */ | ||
427 | /* keyword is the constant keyword (must be lower case already), */ | ||
428 | /* minchars is length of minimum legal abbreviation. */ | ||
429 | { | ||
430 | register int ca, ck; | ||
431 | register int nmatched = 0; | ||
432 | |||
433 | while ((ca = *arg++) != '\0') { | ||
434 | if ((ck = *keyword++) == '\0') | ||
435 | return 0; /* arg longer than keyword, no good */ | ||
436 | if (isupper(ca)) /* force arg to lcase (assume ck is already) */ | ||
437 | ca = tolower(ca); | ||
438 | if (ca != ck) | ||
439 | return 0; /* no good */ | ||
440 | nmatched++; /* count matched characters */ | ||
441 | } | ||
442 | /* reached end of argument; fail if it's too short for unique abbrev */ | ||
443 | if (nmatched < minchars) | ||
444 | return 0; | ||
445 | return 1; /* A-OK */ | ||
446 | } | ||
447 | |||
448 | |||
449 | /* | ||
450 | * The main program. | ||
451 | */ | ||
452 | |||
453 | int | ||
454 | main (int argc, char **argv) | ||
455 | { | ||
456 | int argn; | ||
457 | char * arg; | ||
458 | int verbose = 0, raw = 0; | ||
459 | |||
460 | /* On Mac, fetch a command line. */ | ||
461 | #ifdef USE_CCOMMAND | ||
462 | argc = ccommand(&argv); | ||
463 | #endif | ||
464 | |||
465 | progname = argv[0]; | ||
466 | if (progname == NULL || progname[0] == 0) | ||
467 | progname = "rdjpgcom"; /* in case C library doesn't provide it */ | ||
468 | |||
469 | /* Parse switches, if any */ | ||
470 | for (argn = 1; argn < argc; argn++) { | ||
471 | arg = argv[argn]; | ||
472 | if (arg[0] != '-') | ||
473 | break; /* not switch, must be file name */ | ||
474 | arg++; /* advance over '-' */ | ||
475 | if (keymatch(arg, "verbose", 1)) { | ||
476 | verbose++; | ||
477 | } else if (keymatch(arg, "raw", 1)) { | ||
478 | raw = 1; | ||
479 | } else | ||
480 | usage(); | ||
481 | } | ||
482 | |||
483 | /* Open the input file. */ | ||
484 | /* Unix style: expect zero or one file name */ | ||
485 | if (argn < argc-1) { | ||
486 | fprintf(stderr, "%s: only one input file\n", progname); | ||
487 | usage(); | ||
488 | } | ||
489 | if (argn < argc) { | ||
490 | if ((infile = fopen(argv[argn], READ_BINARY)) == NULL) { | ||
491 | fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]); | ||
492 | exit(EXIT_FAILURE); | ||
493 | } | ||
494 | } else { | ||
495 | /* default input file is stdin */ | ||
496 | #ifdef USE_SETMODE /* need to hack file mode? */ | ||
497 | setmode(fileno(stdin), O_BINARY); | ||
498 | #endif | ||
499 | #ifdef USE_FDOPEN /* need to re-open in binary mode? */ | ||
500 | if ((infile = fdopen(fileno(stdin), READ_BINARY)) == NULL) { | ||
501 | fprintf(stderr, "%s: can't open stdin\n", progname); | ||
502 | exit(EXIT_FAILURE); | ||
503 | } | ||
504 | #else | ||
505 | infile = stdin; | ||
506 | #endif | ||
507 | } | ||
508 | |||
509 | /* Scan the JPEG headers. */ | ||
510 | (void) scan_JPEG_header(verbose, raw); | ||
511 | |||
512 | /* All done. */ | ||
513 | exit(EXIT_SUCCESS); | ||
514 | return 0; /* suppress no-return-value warnings */ | ||
515 | } | ||