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src/Source/LibJPEG/cdjpeg.c  view on Meta::CPAN

/*
 * 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;