ReactOS  0.4.14-dev-317-g96040ec
wrjpgcom.c File Reference
#include "jinclude.h"
#include <ctype.h>
Include dependency graph for wrjpgcom.c:

Go to the source code of this file.

Macros

#define JPEG_CJPEG_DJPEG   /* to get the command-line config symbols */
 
#define READ_BINARY   "rb"
 
#define WRITE_BINARY   "wb"
 
#define EXIT_FAILURE   1
 
#define EXIT_SUCCESS   0
 
#define MAX_COM_LENGTH   65000L /* must be <= 65533 in any case */
 
#define NEXTBYTE()   getc(infile)
 
#define PUTBYTE(x)   putc((x), outfile)
 
#define ERREXIT(msg)   (fprintf(stderr, "%s\n", msg), exit(EXIT_FAILURE))
 
#define M_SOF0   0xC0 /* Start Of Frame N */
 
#define M_SOF1   0xC1 /* N indicates which compression process */
 
#define M_SOF2   0xC2 /* Only SOF0-SOF2 are now in common use */
 
#define M_SOF3   0xC3
 
#define M_SOF5   0xC5 /* NB: codes C4 and CC are NOT SOF markers */
 
#define M_SOF6   0xC6
 
#define M_SOF7   0xC7
 
#define M_SOF9   0xC9
 
#define M_SOF10   0xCA
 
#define M_SOF11   0xCB
 
#define M_SOF13   0xCD
 
#define M_SOF14   0xCE
 
#define M_SOF15   0xCF
 
#define M_SOI   0xD8 /* Start Of Image (beginning of datastream) */
 
#define M_EOI   0xD9 /* End Of Image (end of datastream) */
 
#define M_SOS   0xDA /* Start Of Scan (begins compressed data) */
 
#define M_COM   0xFE /* COMment */
 

Functions

voidmalloc ()
 
static int read_1_byte (void)
 
static unsigned int read_2_bytes (void)
 
static void write_1_byte (int c)
 
static void write_2_bytes (unsigned int val)
 
static void write_marker (int marker)
 
static void copy_rest_of_file (void)
 
static int next_marker (void)
 
static int first_marker (void)
 
static void copy_variable (void)
 
static void skip_variable (void)
 
static int scan_JPEG_header (int keep_COM)
 
static void usage (void)
 
static int keymatch (char *arg, const char *keyword, int minchars)
 
int main (int argc, char **argv)
 

Variables

static FILEinfile
 
static FILEoutfile
 
static const charprogname
 

Macro Definition Documentation

◆ ERREXIT

#define ERREXIT (   msg)    (fprintf(stderr, "%s\n", msg), exit(EXIT_FAILURE))

Definition at line 88 of file wrjpgcom.c.

◆ EXIT_FAILURE

#define EXIT_FAILURE   1

Definition at line 52 of file wrjpgcom.c.

◆ EXIT_SUCCESS

#define EXIT_SUCCESS   0

Definition at line 58 of file wrjpgcom.c.

◆ JPEG_CJPEG_DJPEG

#define JPEG_CJPEG_DJPEG   /* to get the command-line config symbols */

Definition at line 15 of file wrjpgcom.c.

◆ M_COM

#define M_COM   0xFE /* COMment */

Definition at line 174 of file wrjpgcom.c.

◆ M_EOI

#define M_EOI   0xD9 /* End Of Image (end of datastream) */

Definition at line 172 of file wrjpgcom.c.

◆ M_SOF0

#define M_SOF0   0xC0 /* Start Of Frame N */

Definition at line 158 of file wrjpgcom.c.

◆ M_SOF1

#define M_SOF1   0xC1 /* N indicates which compression process */

Definition at line 159 of file wrjpgcom.c.

◆ M_SOF10

#define M_SOF10   0xCA

Definition at line 166 of file wrjpgcom.c.

◆ M_SOF11

#define M_SOF11   0xCB

Definition at line 167 of file wrjpgcom.c.

◆ M_SOF13

#define M_SOF13   0xCD

Definition at line 168 of file wrjpgcom.c.

◆ M_SOF14

#define M_SOF14   0xCE

Definition at line 169 of file wrjpgcom.c.

◆ M_SOF15

#define M_SOF15   0xCF

Definition at line 170 of file wrjpgcom.c.

◆ M_SOF2

#define M_SOF2   0xC2 /* Only SOF0-SOF2 are now in common use */

Definition at line 160 of file wrjpgcom.c.

◆ M_SOF3

#define M_SOF3   0xC3

Definition at line 161 of file wrjpgcom.c.

◆ M_SOF5

#define M_SOF5   0xC5 /* NB: codes C4 and CC are NOT SOF markers */

Definition at line 162 of file wrjpgcom.c.

◆ M_SOF6

#define M_SOF6   0xC6

Definition at line 163 of file wrjpgcom.c.

◆ M_SOF7

#define M_SOF7   0xC7

Definition at line 164 of file wrjpgcom.c.

◆ M_SOF9

#define M_SOF9   0xC9

Definition at line 165 of file wrjpgcom.c.

◆ M_SOI

#define M_SOI   0xD8 /* Start Of Image (beginning of datastream) */

Definition at line 171 of file wrjpgcom.c.

◆ M_SOS

#define M_SOS   0xDA /* Start Of Scan (begins compressed data) */

Definition at line 173 of file wrjpgcom.c.

◆ MAX_COM_LENGTH

#define MAX_COM_LENGTH   65000L /* must be <= 65533 in any case */

Definition at line 67 of file wrjpgcom.c.

◆ NEXTBYTE

#define NEXTBYTE ( )    getc(infile)

Definition at line 79 of file wrjpgcom.c.

◆ PUTBYTE

#define PUTBYTE (   x)    putc((x), outfile)

Definition at line 84 of file wrjpgcom.c.

◆ READ_BINARY

#define READ_BINARY   "rb"

Definition at line 46 of file wrjpgcom.c.

◆ WRITE_BINARY

#define WRITE_BINARY   "wb"

Definition at line 47 of file wrjpgcom.c.

Function Documentation

◆ copy_rest_of_file()

static void copy_rest_of_file ( void  )
static

Definition at line 143 of file wrjpgcom.c.

144 {
145  int c;
146 
147  while ((c = NEXTBYTE()) != EOF)
148  PUTBYTE(c);
149 }
#define NEXTBYTE()
Definition: wrjpgcom.c:79
const GLubyte * c
Definition: glext.h:8905
#define EOF
Definition: stdio.h:24
#define c
Definition: ke_i.h:80
#define PUTBYTE(x)
Definition: wrjpgcom.c:84

Referenced by main().

◆ copy_variable()

static void copy_variable ( void  )
static

Definition at line 245 of file wrjpgcom.c.

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 }
#define ERREXIT(msg)
Definition: wrjpgcom.c:88
static void write_1_byte(int c)
Definition: wrjpgcom.c:123
static void write_2_bytes(unsigned int val)
Definition: wrjpgcom.c:129
static int read_1_byte(void)
Definition: wrjpgcom.c:93
GLenum GLuint GLenum GLsizei length
Definition: glext.h:5579
static unsigned int read_2_bytes(void)
Definition: wrjpgcom.c:106

Referenced by scan_JPEG_header().

◆ first_marker()

static int first_marker ( void  )
static

Definition at line 223 of file wrjpgcom.c.

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 }
#define ERREXIT(msg)
Definition: wrjpgcom.c:88
#define NEXTBYTE()
Definition: wrjpgcom.c:79
#define M_SOI
Definition: wrjpgcom.c:171

Referenced by scan_JPEG_header().

◆ keymatch()

static int keymatch ( char arg,
const char keyword,
int  minchars 
)
static

Definition at line 385 of file wrjpgcom.c.

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 }
const char int minchars
Definition: cdjpeg.h:152
#define isupper(c)
Definition: acclib.h:71
static const WCHAR ca[]
Definition: main.c:455
int tolower(int c)
Definition: utclib.c:902

Referenced by main().

◆ main()

int main ( int argc  ,
char **  argv 
)

Definition at line 414 of file wrjpgcom.c.

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
char * strcat(char *DstString, const char *SrcString)
Definition: utclib.c:568
ACPI_SIZE strlen(const char *String)
Definition: utclib.c:269
static const char * progname
Definition: wrjpgcom.c:348
#define ERREXIT(msg)
Definition: wrjpgcom.c:88
_Check_return_ _CRTIMP int __cdecl getc(_Inout_ FILE *_File)
FILE * stdin
void * arg
Definition: msvc.h:12
#define EXIT_SUCCESS
Definition: wrjpgcom.c:58
static FILE * outfile
Definition: wrjpgcom.c:81
#define argv
Definition: mplay32.c:18
static void write_1_byte(int c)
Definition: wrjpgcom.c:123
#define EXIT_FAILURE
Definition: wrjpgcom.c:52
static void write_2_bytes(unsigned int val)
Definition: wrjpgcom.c:129
FILE * stdout
static FILE * infile
Definition: wrjpgcom.c:76
#define MAX_COM_LENGTH
Definition: wrjpgcom.c:67
_Check_return_opt_ _CRTIMP int __cdecl fprintf(_Inout_ FILE *_File, _In_z_ _Printf_format_string_ const char *_Format,...)
#define READ_BINARY
Definition: wrjpgcom.c:46
smooth NULL
Definition: ftsmooth.c:416
unsigned char
Definition: typeof.h:29
static void write_marker(int marker)
Definition: wrjpgcom.c:136
int marker
Definition: jpeglib.h:1027
_Check_return_ _CRTIMP int __cdecl fileno(_In_ FILE *_File)
static void usage(void)
Definition: wrjpgcom.c:352
const GLubyte * c
Definition: glext.h:8905
_Check_return_opt_ _CRTIMP int __cdecl fclose(_Inout_ FILE *_File)
_Check_return_ _CRTIMP FILE *__cdecl fopen(_In_z_ const char *_Filename, _In_z_ const char *_Mode)
_Check_return_ _CRTIMP int __cdecl setmode(_In_ int _FileHandle, _In_ int _Mode)
#define WRITE_BINARY
Definition: wrjpgcom.c:47
static void copy_rest_of_file(void)
Definition: wrjpgcom.c:143
void * malloc()
#define O_BINARY
Definition: acwin.h:109
_Check_return_ _CRTIMP FILE *__cdecl fdopen(_In_ int _FileHandle, _In_z_ const char *_Format)
#define EOF
Definition: stdio.h:24
char * strcpy(char *DstString, const char *SrcString)
Definition: utclib.c:388
#define c
Definition: ke_i.h:80
FILE * stderr
void exit(int exitcode)
Definition: _exit.c:33
#define M_COM
Definition: wrjpgcom.c:174
static int keymatch(char *arg, const char *keyword, int minchars)
Definition: wrjpgcom.c:385
unsigned int(__cdecl typeof(jpeg_read_scanlines))(struct jpeg_decompress_struct *
Definition: typeof.h:31

◆ malloc()

void* malloc ( )

Referenced by main().

◆ next_marker()

static int next_marker ( void  )
static

Definition at line 188 of file wrjpgcom.c.

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 }
_Check_return_opt_ _CRTIMP int __cdecl fprintf(_Inout_ FILE *_File, _In_z_ _Printf_format_string_ const char *_Format,...)
static int read_1_byte(void)
Definition: wrjpgcom.c:93
const GLubyte * c
Definition: glext.h:8905
#define c
Definition: ke_i.h:80
FILE * stderr

Referenced by scan_JPEG_header().

◆ read_1_byte()

static int read_1_byte ( void  )
static

Definition at line 93 of file wrjpgcom.c.

94 {
95  int c;
96 
97  c = NEXTBYTE();
98  if (c == EOF)
99  ERREXIT("Premature EOF in JPEG file");
100  return c;
101 }
#define ERREXIT(msg)
Definition: wrjpgcom.c:88
#define NEXTBYTE()
Definition: wrjpgcom.c:79
const GLubyte * c
Definition: glext.h:8905
#define EOF
Definition: stdio.h:24
#define c
Definition: ke_i.h:80

Referenced by copy_variable(), next_marker(), and skip_variable().

◆ read_2_bytes()

static unsigned int read_2_bytes ( void  )
static

Definition at line 106 of file wrjpgcom.c.

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 }
#define ERREXIT(msg)
Definition: wrjpgcom.c:88
#define NEXTBYTE()
Definition: wrjpgcom.c:79
#define EOF
Definition: stdio.h:24
unsigned int(__cdecl typeof(jpeg_read_scanlines))(struct jpeg_decompress_struct *
Definition: typeof.h:31

Referenced by copy_variable(), and skip_variable().

◆ scan_JPEG_header()

static int scan_JPEG_header ( int  keep_COM)
static

Definition at line 290 of file wrjpgcom.c.

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 }
#define M_SOF5
Definition: wrjpgcom.c:162
#define M_SOF6
Definition: wrjpgcom.c:163
#define M_SOF9
Definition: wrjpgcom.c:165
#define M_EOI
Definition: wrjpgcom.c:172
#define ERREXIT(msg)
Definition: wrjpgcom.c:88
static void skip_variable(void)
Definition: wrjpgcom.c:265
#define M_SOF3
Definition: wrjpgcom.c:161
static void write_marker(int marker)
Definition: wrjpgcom.c:136
int marker
Definition: jpeglib.h:1027
static int next_marker(void)
Definition: wrjpgcom.c:188
#define M_SOF7
Definition: wrjpgcom.c:164
#define M_SOF13
Definition: wrjpgcom.c:168
#define M_SOF10
Definition: wrjpgcom.c:166
#define M_SOF14
Definition: wrjpgcom.c:169
#define M_SOF15
Definition: wrjpgcom.c:170
static int first_marker(void)
Definition: wrjpgcom.c:223
#define M_SOF11
Definition: wrjpgcom.c:167
static void copy_variable(void)
Definition: wrjpgcom.c:245
#define M_SOF2
Definition: wrjpgcom.c:160
#define M_SOF1
Definition: wrjpgcom.c:159
#define M_SOS
Definition: wrjpgcom.c:173
#define M_SOF0
Definition: wrjpgcom.c:158
#define M_COM
Definition: wrjpgcom.c:174
#define M_SOI
Definition: wrjpgcom.c:171

Referenced by main().

◆ skip_variable()

static void skip_variable ( void  )
static

Definition at line 265 of file wrjpgcom.c.

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 }
struct png_info_def **typedef void(__cdecl typeof(png_destroy_read_struct))(struct png_struct_def **
Definition: typeof.h:49
#define ERREXIT(msg)
Definition: wrjpgcom.c:88
static int read_1_byte(void)
Definition: wrjpgcom.c:93
GLenum GLuint GLenum GLsizei length
Definition: glext.h:5579
static unsigned int read_2_bytes(void)
Definition: wrjpgcom.c:106

Referenced by scan_JPEG_header().

◆ usage()

static void usage ( void  )
static

Definition at line 352 of file wrjpgcom.c.

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 }
static const char * progname
Definition: wrjpgcom.c:348
#define EXIT_FAILURE
Definition: wrjpgcom.c:52
#define MAX_COM_LENGTH
Definition: wrjpgcom.c:67
_Check_return_opt_ _CRTIMP int __cdecl fprintf(_Inout_ FILE *_File, _In_z_ _Printf_format_string_ const char *_Format,...)
FILE * stderr
void exit(int exitcode)
Definition: _exit.c:33

Referenced by main().

◆ write_1_byte()

static void write_1_byte ( int  c)
static

Definition at line 123 of file wrjpgcom.c.

124 {
125  PUTBYTE(c);
126 }
const GLubyte * c
Definition: glext.h:8905
#define PUTBYTE(x)
Definition: wrjpgcom.c:84

Referenced by copy_variable(), and main().

◆ write_2_bytes()

static void write_2_bytes ( unsigned int  val)
static

Definition at line 129 of file wrjpgcom.c.

130 {
131  PUTBYTE((val >> 8) & 0xFF);
132  PUTBYTE(val & 0xFF);
133 }
GLuint GLfloat * val
Definition: glext.h:7180
#define PUTBYTE(x)
Definition: wrjpgcom.c:84

Referenced by copy_variable(), and main().

◆ write_marker()

static void write_marker ( int  marker)
static

Definition at line 136 of file wrjpgcom.c.

137 {
138  PUTBYTE(0xFF);
139  PUTBYTE(marker);
140 }
int marker
Definition: jpeglib.h:1027
#define PUTBYTE(x)
Definition: wrjpgcom.c:84

Referenced by main(), and scan_JPEG_header().

Variable Documentation

◆ infile

FILE* infile
static

Definition at line 76 of file wrjpgcom.c.

Referenced by main().

◆ outfile

◆ progname

const char* progname
static

Definition at line 348 of file wrjpgcom.c.

Referenced by main(), and usage().