/*

 * cdjpeg.c

 *

 * This file was part of the Independent JPEG Group's software:

 * Copyright (C) 1991-1997, Thomas G. Lane.

 * It was modified by The libjpeg-turbo Project to include only code relevant

 * to libjpeg-turbo.

 * For conditions of distribution and use, see the accompanying README.ijg

 * 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() */</ctype.h>

#ifdef USE_SETMODE

#include <fcntl.h>              /* to declare setmode()'s parameter macros */</fcntl.h>

/* If you have setmode() but not <io.h>, just delete this line: */</io.h>

#include <io.h>                 /* to declare setmode() */</io.h>

#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;

}