ReactOS  0.4.13-dev-650-g34bf247
wrjpgcom.c
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1 /*
2  * wrjpgcom.c
3  *
4  * Copyright (C) 1994-1997, Thomas G. Lane.
5  * Modified 2015-2017 by 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 inserts
10  * user-supplied text as a COM (comment) marker 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 #ifndef HAVE_STDLIB_H /* <stdlib.h> should declare malloc() */
19 extern void * malloc ();
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 #define WRITE_BINARY "w"
41 #else
42 #ifdef VMS /* VMS is very nonstandard */
43 #define READ_BINARY "rb", "ctx=stm"
44 #define WRITE_BINARY "wb", "ctx=stm"
45 #else /* standard ANSI-compliant case */
46 #define READ_BINARY "rb"
47 #define WRITE_BINARY "wb"
48 #endif
49 #endif
50 
51 #ifndef EXIT_FAILURE /* define exit() codes if not provided */
52 #define EXIT_FAILURE 1
53 #endif
54 #ifndef EXIT_SUCCESS
55 #ifdef VMS
56 #define EXIT_SUCCESS 1 /* VMS is very nonstandard */
57 #else
58 #define EXIT_SUCCESS 0
59 #endif
60 #endif
61 
62 /* Reduce this value if your malloc() can't allocate blocks up to 64K.
63  * On DOS, compiling in large model is usually a better solution.
64  */
65 
66 #ifndef MAX_COM_LENGTH
67 #define MAX_COM_LENGTH 65000L /* must be <= 65533 in any case */
68 #endif
69 
70 
71 /*
72  * These macros are used to read the input file and write the output file.
73  * To reuse this code in another application, you might need to change these.
74  */
75 
76 static FILE * infile; /* input JPEG file */
77 
78 /* Return next input byte, or EOF if no more */
79 #define NEXTBYTE() getc(infile)
80 
81 static FILE * outfile; /* output JPEG file */
82 
83 /* Emit an output byte */
84 #define PUTBYTE(x) putc((x), outfile)
85 
86 
87 /* Error exit handler */
88 #define ERREXIT(msg) (fprintf(stderr, "%s\n", msg), exit(EXIT_FAILURE))
89 
90 
91 /* Read one byte, testing for EOF */
92 static int
94 {
95  int c;
96 
97  c = NEXTBYTE();
98  if (c == EOF)
99  ERREXIT("Premature EOF in JPEG file");
100  return c;
101 }
102 
103 /* Read 2 bytes, convert to unsigned int */
104 /* All 2-byte quantities in JPEG markers are MSB first */
105 static unsigned int
107 {
108  int c1, c2;
109 
110  c1 = NEXTBYTE();
111  if (c1 == EOF)
112  ERREXIT("Premature EOF in JPEG file");
113  c2 = NEXTBYTE();
114  if (c2 == EOF)
115  ERREXIT("Premature EOF in JPEG file");
116  return (((unsigned int) c1) << 8) + ((unsigned int) c2);
117 }
118 
119 
120 /* Routines to write data to output file */
121 
122 static void
124 {
125  PUTBYTE(c);
126 }
127 
128 static void
129 write_2_bytes (unsigned int val)
130 {
131  PUTBYTE((val >> 8) & 0xFF);
132  PUTBYTE(val & 0xFF);
133 }
134 
135 static void
137 {
138  PUTBYTE(0xFF);
139  PUTBYTE(marker);
140 }
141 
142 static void
144 {
145  int c;
146 
147  while ((c = NEXTBYTE()) != EOF)
148  PUTBYTE(c);
149 }
150 
151 
152 /*
153  * JPEG markers consist of one or more 0xFF bytes, followed by a marker
154  * code byte (which is not an FF). Here are the marker codes of interest
155  * in this program. (See jdmarker.c for a more complete list.)
156  */
157 
158 #define M_SOF0 0xC0 /* Start Of Frame N */
159 #define M_SOF1 0xC1 /* N indicates which compression process */
160 #define M_SOF2 0xC2 /* Only SOF0-SOF2 are now in common use */
161 #define M_SOF3 0xC3
162 #define M_SOF5 0xC5 /* NB: codes C4 and CC are NOT SOF markers */
163 #define M_SOF6 0xC6
164 #define M_SOF7 0xC7
165 #define M_SOF9 0xC9
166 #define M_SOF10 0xCA
167 #define M_SOF11 0xCB
168 #define M_SOF13 0xCD
169 #define M_SOF14 0xCE
170 #define M_SOF15 0xCF
171 #define M_SOI 0xD8 /* Start Of Image (beginning of datastream) */
172 #define M_EOI 0xD9 /* End Of Image (end of datastream) */
173 #define M_SOS 0xDA /* Start Of Scan (begins compressed data) */
174 #define M_COM 0xFE /* COMment */
175 
176 
177 /*
178  * Find the next JPEG marker and return its marker code.
179  * We expect at least one FF byte, possibly more if the compressor used FFs
180  * to pad the file. (Padding FFs will NOT be replicated in the output file.)
181  * There could also be non-FF garbage between markers. The treatment of such
182  * garbage is unspecified; we choose to skip over it but emit a warning msg.
183  * NB: this routine must not be used after seeing SOS marker, since it will
184  * not deal correctly with FF/00 sequences in the compressed image data...
185  */
186 
187 static int
189 {
190  int c;
191  int discarded_bytes = 0;
192 
193  /* Find 0xFF byte; count and skip any non-FFs. */
194  c = read_1_byte();
195  while (c != 0xFF) {
196  discarded_bytes++;
197  c = read_1_byte();
198  }
199  /* Get marker code byte, swallowing any duplicate FF bytes. Extra FFs
200  * are legal as pad bytes, so don't count them in discarded_bytes.
201  */
202  do {
203  c = read_1_byte();
204  } while (c == 0xFF);
205 
206  if (discarded_bytes != 0) {
207  fprintf(stderr, "Warning: garbage data found in JPEG file\n");
208  }
209 
210  return c;
211 }
212 
213 
214 /*
215  * Read the initial marker, which should be SOI.
216  * For a JFIF file, the first two bytes of the file should be literally
217  * 0xFF M_SOI. To be more general, we could use next_marker, but if the
218  * input file weren't actually JPEG at all, next_marker might read the whole
219  * file and then return a misleading error message...
220  */
221 
222 static int
224 {
225  int c1, c2;
226 
227  c1 = NEXTBYTE();
228  c2 = NEXTBYTE();
229  if (c1 != 0xFF || c2 != M_SOI)
230  ERREXIT("Not a JPEG file");
231  return c2;
232 }
233 
234 
235 /*
236  * Most types of marker are followed by a variable-length parameter segment.
237  * This routine skips over the parameters for any marker we don't otherwise
238  * want to process.
239  * Note that we MUST skip the parameter segment explicitly in order not to
240  * be fooled by 0xFF bytes that might appear within the parameter segment;
241  * such bytes do NOT introduce new markers.
242  */
243 
244 static void
246 /* Copy an unknown or uninteresting variable-length marker */
247 {
248  unsigned int length;
249 
250  /* Get the marker parameter length count */
251  length = read_2_bytes();
253  /* Length includes itself, so must be at least 2 */
254  if (length < 2)
255  ERREXIT("Erroneous JPEG marker length");
256  length -= 2;
257  /* Copy the remaining bytes */
258  while (length > 0) {
260  length--;
261  }
262 }
263 
264 static void
266 /* Skip over an unknown or uninteresting variable-length marker */
267 {
268  unsigned int length;
269 
270  /* Get the marker parameter length count */
271  length = read_2_bytes();
272  /* Length includes itself, so must be at least 2 */
273  if (length < 2)
274  ERREXIT("Erroneous JPEG marker length");
275  length -= 2;
276  /* Skip over the remaining bytes */
277  while (length > 0) {
278  (void) read_1_byte();
279  length--;
280  }
281 }
282 
283 
284 /*
285  * Parse the marker stream until SOFn or EOI is seen;
286  * copy data to output, but discard COM markers unless keep_COM is true.
287  */
288 
289 static int
290 scan_JPEG_header (int keep_COM)
291 {
292  int marker;
293 
294  /* Expect SOI at start of file */
295  if (first_marker() != M_SOI)
296  ERREXIT("Expected SOI marker first");
298 
299  /* Scan miscellaneous markers until we reach SOFn. */
300  for (;;) {
301  marker = next_marker();
302  switch (marker) {
303  /* Note that marker codes 0xC4, 0xC8, 0xCC are not, and must not be,
304  * treated as SOFn. C4 in particular is actually DHT.
305  */
306  case M_SOF0: /* Baseline */
307  case M_SOF1: /* Extended sequential, Huffman */
308  case M_SOF2: /* Progressive, Huffman */
309  case M_SOF3: /* Lossless, Huffman */
310  case M_SOF5: /* Differential sequential, Huffman */
311  case M_SOF6: /* Differential progressive, Huffman */
312  case M_SOF7: /* Differential lossless, Huffman */
313  case M_SOF9: /* Extended sequential, arithmetic */
314  case M_SOF10: /* Progressive, arithmetic */
315  case M_SOF11: /* Lossless, arithmetic */
316  case M_SOF13: /* Differential sequential, arithmetic */
317  case M_SOF14: /* Differential progressive, arithmetic */
318  case M_SOF15: /* Differential lossless, arithmetic */
319  return marker;
320 
321  case M_SOS: /* should not see compressed data before SOF */
322  ERREXIT("SOS without prior SOFn");
323  break;
324 
325  case M_EOI: /* in case it's a tables-only JPEG stream */
326  return marker;
327 
328  case M_COM: /* Existing COM: conditionally discard */
329  if (keep_COM) {
331  copy_variable();
332  } else {
333  skip_variable();
334  }
335  break;
336 
337  default: /* Anything else just gets copied */
339  copy_variable(); /* we assume it has a parameter count... */
340  break;
341  }
342  } /* end loop */
343 }
344 
345 
346 /* Command line parsing code */
347 
348 static const char * progname; /* program name for error messages */
349 
350 
351 static void
352 usage (void)
353 /* complain about bad command line */
354 {
355  fprintf(stderr, "wrjpgcom inserts a textual comment in a JPEG file.\n");
356  fprintf(stderr, "You can add to or replace any existing comment(s).\n");
357 
358  fprintf(stderr, "Usage: %s [switches] ", progname);
359 #ifdef TWO_FILE_COMMANDLINE
360  fprintf(stderr, "inputfile outputfile\n");
361 #else
362  fprintf(stderr, "[inputfile]\n");
363 #endif
364 
365  fprintf(stderr, "Switches (names may be abbreviated):\n");
366  fprintf(stderr, " -replace Delete any existing comments\n");
367  fprintf(stderr, " -comment \"text\" Insert comment with given text\n");
368  fprintf(stderr, " -cfile name Read comment from named file\n");
369  fprintf(stderr, "Notice that you must put quotes around the comment text\n");
370  fprintf(stderr, "when you use -comment.\n");
371  fprintf(stderr, "If you do not give either -comment or -cfile on the command line,\n");
372  fprintf(stderr, "then the comment text is read from standard input.\n");
373  fprintf(stderr, "It can be multiple lines, up to %u characters total.\n",
374  (unsigned int) MAX_COM_LENGTH);
375 #ifndef TWO_FILE_COMMANDLINE
376  fprintf(stderr, "You must specify an input JPEG file name when supplying\n");
377  fprintf(stderr, "comment text from standard input.\n");
378 #endif
379 
381 }
382 
383 
384 static int
385 keymatch (char * arg, const char * keyword, int minchars)
386 /* Case-insensitive matching of (possibly abbreviated) keyword switches. */
387 /* keyword is the constant keyword (must be lower case already), */
388 /* minchars is length of minimum legal abbreviation. */
389 {
390  register int ca, ck;
391  register int nmatched = 0;
392 
393  while ((ca = *arg++) != '\0') {
394  if ((ck = *keyword++) == '\0')
395  return 0; /* arg longer than keyword, no good */
396  if (isupper(ca)) /* force arg to lcase (assume ck is already) */
397  ca = tolower(ca);
398  if (ca != ck)
399  return 0; /* no good */
400  nmatched++; /* count matched characters */
401  }
402  /* reached end of argument; fail if it's too short for unique abbrev */
403  if (nmatched < minchars)
404  return 0;
405  return 1; /* A-OK */
406 }
407 
408 
409 /*
410  * The main program.
411  */
412 
413 int
414 main (int argc, char **argv)
415 {
416  int argn;
417  char * arg;
418  int keep_COM = 1;
419  char * comment_arg = NULL;
420  FILE * comment_file = NULL;
421  unsigned int comment_length = 0;
422  int marker;
423 
424  /* On Mac, fetch a command line. */
425 #ifdef USE_CCOMMAND
426  argc = ccommand(&argv);
427 #endif
428 
429  progname = argv[0];
430  if (progname == NULL || progname[0] == 0)
431  progname = "wrjpgcom"; /* in case C library doesn't provide it */
432 
433  /* Parse switches, if any */
434  for (argn = 1; argn < argc; argn++) {
435  arg = argv[argn];
436  if (arg[0] != '-')
437  break; /* not switch, must be file name */
438  arg++; /* advance over '-' */
439  if (keymatch(arg, "replace", 1)) {
440  keep_COM = 0;
441  } else if (keymatch(arg, "cfile", 2)) {
442  if (++argn >= argc) usage();
443  if ((comment_file = fopen(argv[argn], "r")) == NULL) {
444  fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
446  }
447  } else if (keymatch(arg, "comment", 1)) {
448  if (++argn >= argc) usage();
449  comment_arg = argv[argn];
450  /* If the comment text starts with '"', then we are probably running
451  * under MS-DOG and must parse out the quoted string ourselves. Sigh.
452  */
453  if (comment_arg[0] == '"') {
454  comment_arg = (char *) malloc((size_t) MAX_COM_LENGTH);
455  if (comment_arg == NULL)
456  ERREXIT("Insufficient memory");
457  if (strlen(argv[argn]+1) >= (size_t) MAX_COM_LENGTH) {
458  fprintf(stderr, "Comment text may not exceed %u bytes\n",
459  (unsigned int) MAX_COM_LENGTH);
461  }
462  strcpy(comment_arg, argv[argn]+1);
463  for (;;) {
464  comment_length = (unsigned int) strlen(comment_arg);
465  if (comment_length > 0 && comment_arg[comment_length-1] == '"') {
466  comment_arg[comment_length-1] = '\0'; /* zap terminating quote */
467  break;
468  }
469  if (++argn >= argc)
470  ERREXIT("Missing ending quote mark");
471  if (strlen(comment_arg) + 1 + strlen(argv[argn]) >=
472  (size_t) MAX_COM_LENGTH) {
473  fprintf(stderr, "Comment text may not exceed %u bytes\n",
474  (unsigned int) MAX_COM_LENGTH);
476  }
477  strcat(comment_arg, " ");
478  strcat(comment_arg, argv[argn]);
479  }
480  } else if (strlen(comment_arg) >= (size_t) MAX_COM_LENGTH) {
481  fprintf(stderr, "Comment text may not exceed %u bytes\n",
482  (unsigned int) MAX_COM_LENGTH);
484  }
485  comment_length = (unsigned int) strlen(comment_arg);
486  } else
487  usage();
488  }
489 
490  /* Cannot use both -comment and -cfile. */
491  if (comment_arg != NULL && comment_file != NULL)
492  usage();
493  /* If there is neither -comment nor -cfile, we will read the comment text
494  * from stdin; in this case there MUST be an input JPEG file name.
495  */
496  if (comment_arg == NULL && comment_file == NULL && argn >= argc)
497  usage();
498 
499  /* Open the input file. */
500  if (argn < argc) {
501  if ((infile = fopen(argv[argn], READ_BINARY)) == NULL) {
502  fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
504  }
505  } else {
506  /* default input file is stdin */
507 #ifdef USE_SETMODE /* need to hack file mode? */
509 #endif
510 #ifdef USE_FDOPEN /* need to re-open in binary mode? */
511  if ((infile = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
512  fprintf(stderr, "%s: can't open stdin\n", progname);
514  }
515 #else
516  infile = stdin;
517 #endif
518  }
519 
520  /* Open the output file. */
521 #ifdef TWO_FILE_COMMANDLINE
522  /* Must have explicit output file name */
523  if (argn != argc-2) {
524  fprintf(stderr, "%s: must name one input and one output file\n",
525  progname);
526  usage();
527  }
528  if ((outfile = fopen(argv[argn+1], WRITE_BINARY)) == NULL) {
529  fprintf(stderr, "%s: can't open %s\n", progname, argv[argn+1]);
531  }
532 #else
533  /* Unix style: expect zero or one file name */
534  if (argn < argc-1) {
535  fprintf(stderr, "%s: only one input file\n", progname);
536  usage();
537  }
538  /* default output file is stdout */
539 #ifdef USE_SETMODE /* need to hack file mode? */
541 #endif
542 #ifdef USE_FDOPEN /* need to re-open in binary mode? */
543  if ((outfile = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
544  fprintf(stderr, "%s: can't open stdout\n", progname);
546  }
547 #else
548  outfile = stdout;
549 #endif
550 #endif /* TWO_FILE_COMMANDLINE */
551 
552  /* Collect comment text from comment_file or stdin, if necessary */
553  if (comment_arg == NULL) {
554  FILE * src_file;
555  int c;
556 
557  comment_arg = (char *) malloc((size_t) MAX_COM_LENGTH);
558  if (comment_arg == NULL)
559  ERREXIT("Insufficient memory");
560  comment_length = 0;
561  src_file = (comment_file != NULL ? comment_file : stdin);
562  while ((c = getc(src_file)) != EOF) {
563  if (comment_length >= (unsigned int) MAX_COM_LENGTH) {
564  fprintf(stderr, "Comment text may not exceed %u bytes\n",
565  (unsigned int) MAX_COM_LENGTH);
567  }
568  comment_arg[comment_length++] = (char) c;
569  }
570  if (comment_file != NULL)
571  fclose(comment_file);
572  }
573 
574  /* Copy JPEG headers until SOFn marker;
575  * we will insert the new comment marker just before SOFn.
576  * This (a) causes the new comment to appear after, rather than before,
577  * existing comments; and (b) ensures that comments come after any JFIF
578  * or JFXX markers, as required by the JFIF specification.
579  */
580  marker = scan_JPEG_header(keep_COM);
581  /* Insert the new COM marker, but only if nonempty text has been supplied */
582  if (comment_length > 0) {
584  write_2_bytes(comment_length + 2);
585  while (comment_length > 0) {
586  write_1_byte(*comment_arg++);
587  comment_length--;
588  }
589  }
590  /* Duplicate the remainder of the source file.
591  * Note that any COM markers occuring after SOF will not be touched.
592  */
595 
596  /* All done. */
598  return 0; /* suppress no-return-value warnings */
599 }
static int scan_JPEG_header(int keep_COM)
Definition: wrjpgcom.c:290
static int argc
Definition: ServiceArgs.c:12
struct png_info_def **typedef void(__cdecl typeof(png_destroy_read_struct))(struct png_struct_def **
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#define M_SOF5
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ACPI_SIZE strlen(const char *String)
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#define M_SOF6
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#define M_SOF9
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#define ERREXIT(msg)
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int marker
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#define isupper(c)
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#define M_SOF7
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GLenum GLuint GLenum GLsizei length
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int main(int argc, char **argv)
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#define M_SOF13
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#define M_SOF10
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const GLubyte * c
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#define M_SOS
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Definition: main.c:457
int tolower(int c)
Definition: utclib.c:902
static unsigned int read_2_bytes(void)
Definition: wrjpgcom.c:106
#define M_COM
Definition: wrjpgcom.c:174
static int keymatch(char *arg, const char *keyword, int minchars)
Definition: wrjpgcom.c:385
#define M_SOI
Definition: wrjpgcom.c:171
unsigned int(__cdecl typeof(jpeg_read_scanlines))(struct jpeg_decompress_struct *
Definition: typeof.h:31