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      1 /*
      2  * cdjpeg.c
      3  *
      4  * This file was part of the Independent JPEG Group's software:
      5  * Copyright (C) 1991-1997, Thomas G. Lane.
      6  * It was modified by The libjpeg-turbo Project to include only code relevant
      7  * to libjpeg-turbo.
      8  * For conditions of distribution and use, see the accompanying README file.
      9  *
     10  * This file contains common support routines used by the IJG application
     11  * programs (cjpeg, djpeg, jpegtran).
     12  */
     13 
     14 #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
     15 #include <ctype.h>              /* to declare isupper(), tolower() */
     16 #ifdef USE_SETMODE
     17 #include <fcntl.h>              /* to declare setmode()'s parameter macros */
     18 /* If you have setmode() but not <io.h>, just delete this line: */
     19 #include <io.h>                 /* to declare setmode() */
     20 #endif
     21 
     22 
     23 /*
     24  * Optional progress monitor: display a percent-done figure on stderr.
     25  */
     26 
     27 #ifdef PROGRESS_REPORT
     28 
     29 METHODDEF(void)
     30 progress_monitor (j_common_ptr cinfo)
     31 {
     32   cd_progress_ptr prog = (cd_progress_ptr) cinfo->progress;
     33   int total_passes = prog->pub.total_passes + prog->total_extra_passes;
     34   int percent_done = (int) (prog->pub.pass_counter*100L/prog->pub.pass_limit);
     35 
     36   if (percent_done != prog->percent_done) {
     37     prog->percent_done = percent_done;
     38     if (total_passes > 1) {
     39       fprintf(stderr, "\rPass %d/%d: %3d%% ",
     40               prog->pub.completed_passes + prog->completed_extra_passes + 1,
     41               total_passes, percent_done);
     42     } else {
     43       fprintf(stderr, "\r %3d%% ", percent_done);
     44     }
     45     fflush(stderr);
     46   }
     47 }
     48 
     49 
     50 GLOBAL(void)
     51 start_progress_monitor (j_common_ptr cinfo, cd_progress_ptr progress)
     52 {
     53   /* Enable progress display, unless trace output is on */
     54   if (cinfo->err->trace_level == 0) {
     55     progress->pub.progress_monitor = progress_monitor;
     56     progress->completed_extra_passes = 0;
     57     progress->total_extra_passes = 0;
     58     progress->percent_done = -1;
     59     cinfo->progress = &progress->pub;
     60   }
     61 }
     62 
     63 
     64 GLOBAL(void)
     65 end_progress_monitor (j_common_ptr cinfo)
     66 {
     67   /* Clear away progress display */
     68   if (cinfo->err->trace_level == 0) {
     69     fprintf(stderr, "\r                \r");
     70     fflush(stderr);
     71   }
     72 }
     73 
     74 #endif
     75 
     76 
     77 /*
     78  * Case-insensitive matching of possibly-abbreviated keyword switches.
     79  * keyword is the constant keyword (must be lower case already),
     80  * minchars is length of minimum legal abbreviation.
     81  */
     82 
     83 GLOBAL(boolean)
     84 keymatch (char * arg, const char * keyword, int minchars)
     85 {
     86   register int ca, ck;
     87   register int nmatched = 0;
     88 
     89   while ((ca = *arg++) != '\0') {
     90     if ((ck = *keyword++) == '\0')
     91       return FALSE;             /* arg longer than keyword, no good */
     92     if (isupper(ca))            /* force arg to lcase (assume ck is already) */
     93       ca = tolower(ca);
     94     if (ca != ck)
     95       return FALSE;             /* no good */
     96     nmatched++;                 /* count matched characters */
     97   }
     98   /* reached end of argument; fail if it's too short for unique abbrev */
     99   if (nmatched < minchars)
    100     return FALSE;
    101   return TRUE;                  /* A-OK */
    102 }
    103 
    104 
    105 /*
    106  * Routines to establish binary I/O mode for stdin and stdout.
    107  * Non-Unix systems often require some hacking to get out of text mode.
    108  */
    109 
    110 GLOBAL(FILE *)
    111 read_stdin (void)
    112 {
    113   FILE * input_file = stdin;
    114 
    115 #ifdef USE_SETMODE              /* need to hack file mode? */
    116   setmode(fileno(stdin), O_BINARY);
    117 #endif
    118 #ifdef USE_FDOPEN               /* need to re-open in binary mode? */
    119   if ((input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
    120     fprintf(stderr, "Cannot reopen stdin\n");
    121     exit(EXIT_FAILURE);
    122   }
    123 #endif
    124   return input_file;
    125 }
    126 
    127 
    128 GLOBAL(FILE *)
    129 write_stdout (void)
    130 {
    131   FILE * output_file = stdout;
    132 
    133 #ifdef USE_SETMODE              /* need to hack file mode? */
    134   setmode(fileno(stdout), O_BINARY);
    135 #endif
    136 #ifdef USE_FDOPEN               /* need to re-open in binary mode? */
    137   if ((output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
    138     fprintf(stderr, "Cannot reopen stdout\n");
    139     exit(EXIT_FAILURE);
    140   }
    141 #endif
    142   return output_file;
    143 }
    144