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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.ijg
      9  * file.
     10  *
     11  * This file contains common support routines used by the IJG application
     12  * programs (cjpeg, djpeg, jpegtran).
     13  */
     14 
     15 #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
     16 #include <ctype.h>              /* to declare isupper(), tolower() */
     17 #ifdef USE_SETMODE
     18 #include <fcntl.h>              /* to declare setmode()'s parameter macros */
     19 /* If you have setmode() but not <io.h>, just delete this line: */
     20 #include <io.h>                 /* to declare setmode() */
     21 #endif
     22 
     23 
     24 /*
     25  * Optional progress monitor: display a percent-done figure on stderr.
     26  */
     27 
     28 #ifdef PROGRESS_REPORT
     29 
     30 METHODDEF(void)
     31 progress_monitor (j_common_ptr cinfo)
     32 {
     33   cd_progress_ptr prog = (cd_progress_ptr) cinfo->progress;
     34   int total_passes = prog->pub.total_passes + prog->total_extra_passes;
     35   int percent_done = (int) (prog->pub.pass_counter*100L/prog->pub.pass_limit);
     36 
     37   if (percent_done != prog->percent_done) {
     38     prog->percent_done = percent_done;
     39     if (total_passes > 1) {
     40       fprintf(stderr, "\rPass %d/%d: %3d%% ",
     41               prog->pub.completed_passes + prog->completed_extra_passes + 1,
     42               total_passes, percent_done);
     43     } else {
     44       fprintf(stderr, "\r %3d%% ", percent_done);
     45     }
     46     fflush(stderr);
     47   }
     48 }
     49 
     50 
     51 GLOBAL(void)
     52 start_progress_monitor (j_common_ptr cinfo, cd_progress_ptr progress)
     53 {
     54   /* Enable progress display, unless trace output is on */
     55   if (cinfo->err->trace_level == 0) {
     56     progress->pub.progress_monitor = progress_monitor;
     57     progress->completed_extra_passes = 0;
     58     progress->total_extra_passes = 0;
     59     progress->percent_done = -1;
     60     cinfo->progress = &progress->pub;
     61   }
     62 }
     63 
     64 
     65 GLOBAL(void)
     66 end_progress_monitor (j_common_ptr cinfo)
     67 {
     68   /* Clear away progress display */
     69   if (cinfo->err->trace_level == 0) {
     70     fprintf(stderr, "\r                \r");
     71     fflush(stderr);
     72   }
     73 }
     74 
     75 #endif
     76 
     77 
     78 /*
     79  * Case-insensitive matching of possibly-abbreviated keyword switches.
     80  * keyword is the constant keyword (must be lower case already),
     81  * minchars is length of minimum legal abbreviation.
     82  */
     83 
     84 GLOBAL(boolean)
     85 keymatch (char *arg, const char *keyword, int minchars)
     86 {
     87   register int ca, ck;
     88   register int nmatched = 0;
     89 
     90   while ((ca = *arg++) != '\0') {
     91     if ((ck = *keyword++) == '\0')
     92       return FALSE;             /* arg longer than keyword, no good */
     93     if (isupper(ca))            /* force arg to lcase (assume ck is already) */
     94       ca = tolower(ca);
     95     if (ca != ck)
     96       return FALSE;             /* no good */
     97     nmatched++;                 /* count matched characters */
     98   }
     99   /* reached end of argument; fail if it's too short for unique abbrev */
    100   if (nmatched < minchars)
    101     return FALSE;
    102   return TRUE;                  /* A-OK */
    103 }
    104 
    105 
    106 /*
    107  * Routines to establish binary I/O mode for stdin and stdout.
    108  * Non-Unix systems often require some hacking to get out of text mode.
    109  */
    110 
    111 GLOBAL(FILE *)
    112 read_stdin (void)
    113 {
    114   FILE * input_file = stdin;
    115 
    116 #ifdef USE_SETMODE              /* need to hack file mode? */
    117   setmode(fileno(stdin), O_BINARY);
    118 #endif
    119 #ifdef USE_FDOPEN               /* need to re-open in binary mode? */
    120   if ((input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
    121     fprintf(stderr, "Cannot reopen stdin\n");
    122     exit(EXIT_FAILURE);
    123   }
    124 #endif
    125   return input_file;
    126 }
    127 
    128 
    129 GLOBAL(FILE *)
    130 write_stdout (void)
    131 {
    132   FILE * output_file = stdout;
    133 
    134 #ifdef USE_SETMODE              /* need to hack file mode? */
    135   setmode(fileno(stdout), O_BINARY);
    136 #endif
    137 #ifdef USE_FDOPEN               /* need to re-open in binary mode? */
    138   if ((output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
    139     fprintf(stderr, "Cannot reopen stdout\n");
    140     exit(EXIT_FAILURE);
    141   }
    142 #endif
    143   return output_file;
    144 }
    145