www.pudn.com > imgport.rar > cdjpeg.c, change:2008-11-05,size:4863b


/* 
 * cdjpeg.c 
 * 
 * Copyright (C) 1991-1997, Thomas G. Lane. 
 * This file is part of the Independent JPEG Group's software. 
 * For conditions of distribution and use, see the accompanying README file. 
 * 
 * This file contains common support routines used by the IJG application 
 * programs (cjpeg, djpeg, jpegtran). 
 */ 
 
#include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */ 
#include <ctype.h>		/* to declare isupper(), tolower() */ 
#ifdef NEED_SIGNAL_CATCHER 
#include <signal.h>		/* to declare signal() */ 
#endif 
#ifdef USE_SETMODE 
#include <fcntl.h>		/* to declare setmode()'s parameter macros */ 
/* If you have setmode() but not <io.h>, just delete this line: */ 
#include <io.h>			/* to declare setmode() */ 
#endif 
 
 
/* 
 * Signal catcher to ensure that temporary files are removed before aborting. 
 * NB: for Amiga Manx C this is actually a global routine named _abort(); 
 * we put "#define signal_catcher _abort" in jconfig.h.  Talk about bogus... 
 */ 
 
#ifdef NEED_SIGNAL_CATCHER 
 
static j_common_ptr sig_cinfo; 
 
void				/* must be global for Manx C */ 
signal_catcher (int signum) 
{ 
  if (sig_cinfo != NULL) { 
    if (sig_cinfo->err != NULL) /* turn off trace output */ 
      sig_cinfo->err->trace_level = 0; 
    jpeg_destroy(sig_cinfo);	/* clean up memory allocation & temp files */ 
  } 
  exit(EXIT_FAILURE); 
} 
 
 
GLOBAL(void) 
enable_signal_catcher (j_common_ptr cinfo) 
{ 
  sig_cinfo = cinfo; 
#ifdef SIGINT			/* not all systems have SIGINT */ 
  signal(SIGINT, signal_catcher); 
#endif 
#ifdef SIGTERM			/* not all systems have SIGTERM */ 
  signal(SIGTERM, signal_catcher); 
#endif 
} 
 
#endif 
 
 
/* 
 * Optional progress monitor: display a percent-done figure on stderr. 
 */ 
 
#ifdef PROGRESS_REPORT 
 
METHODDEF(void) 
progress_monitor (j_common_ptr cinfo) 
{ 
  cd_progress_ptr prog = (cd_progress_ptr) cinfo->progress; 
  int total_passes = prog->pub.total_passes + prog->total_extra_passes; 
  int percent_done = (int) (prog->pub.pass_counter*100L/prog->pub.pass_limit); 
 
  if (percent_done != prog->percent_done) { 
    prog->percent_done = percent_done; 
    if (total_passes > 1) { 
      fprintf(stderr, "\rPass %d/%d: %3d%% ", 
	      prog->pub.completed_passes + prog->completed_extra_passes + 1, 
	      total_passes, percent_done); 
    } else { 
      fprintf(stderr, "\r %3d%% ", percent_done); 
    } 
    fflush(stderr); 
  } 
} 
 
 
GLOBAL(void) 
start_progress_monitor (j_common_ptr cinfo, cd_progress_ptr progress) 
{ 
  /* Enable progress display, unless trace output is on */ 
  if (cinfo->err->trace_level == 0) { 
    progress->pub.progress_monitor = progress_monitor; 
    progress->completed_extra_passes = 0; 
    progress->total_extra_passes = 0; 
    progress->percent_done = -1; 
    cinfo->progress = &progress->pub; 
  } 
} 
 
 
GLOBAL(void) 
end_progress_monitor (j_common_ptr cinfo) 
{ 
  /* Clear away progress display */ 
  if (cinfo->err->trace_level == 0) { 
    fprintf(stderr, "\r                \r"); 
    fflush(stderr); 
  } 
} 
 
#endif 
 
 
/* 
 * Case-insensitive matching of possibly-abbreviated keyword switches. 
 * keyword is the constant keyword (must be lower case already), 
 * minchars is length of minimum legal abbreviation. 
 */ 
 
GLOBAL(boolean) 
keymatch (char * arg, const char * keyword, int minchars) 
{ 
  register int ca, ck; 
  register int nmatched = 0; 
 
  while ((ca = *arg++) != '\0') { 
    if ((ck = *keyword++) == '\0') 
      return FALSE;		/* arg longer than keyword, no good */ 
    if (isupper(ca))		/* force arg to lcase (assume ck is already) */ 
      ca = tolower(ca); 
    if (ca != ck) 
      return FALSE;		/* no good */ 
    nmatched++;			/* count matched characters */ 
  } 
  /* reached end of argument; fail if it's too short for unique abbrev */ 
  if (nmatched < minchars) 
    return FALSE; 
  return TRUE;			/* A-OK */ 
} 
 
 
/* 
 * Routines to establish binary I/O mode for stdin and stdout. 
 * Non-Unix systems often require some hacking to get out of text mode. 
 */ 
 
GLOBAL(FILE *) 
read_stdin (void) 
{ 
  FILE * input_file = stdin; 
 
#ifdef USE_SETMODE		/* need to hack file mode? */ 
  setmode(fileno(stdin), O_BINARY); 
#endif 
#ifdef USE_FDOPEN		/* need to re-open in binary mode? */ 
  if ((input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) { 
    fprintf(stderr, "Cannot reopen stdin\n"); 
    exit(EXIT_FAILURE); 
  } 
#endif 
  return input_file; 
} 
 
 
GLOBAL(FILE *) 
write_stdout (void) 
{ 
  FILE * output_file = stdout; 
 
#ifdef USE_SETMODE		/* need to hack file mode? */ 
  setmode(fileno(stdout), O_BINARY); 
#endif 
#ifdef USE_FDOPEN		/* need to re-open in binary mode? */ 
  if ((output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) { 
    fprintf(stderr, "Cannot reopen stdout\n"); 
    exit(EXIT_FAILURE); 
  } 
#endif 
  return output_file; 
}