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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 =
     36     (int)(prog->pub.pass_counter * 100L / prog->pub.pass_limit);
     37 
     38   if (percent_done != prog->percent_done) {
     39     prog->percent_done = percent_done;
     40     if (total_passes > 1) {
     41       fprintf(stderr, "\rPass %d/%d: %3d%% ",
     42               prog->pub.completed_passes + prog->completed_extra_passes + 1,
     43               total_passes, percent_done);
     44     } else {
     45       fprintf(stderr, "\r %3d%% ", percent_done);
     46     }
     47     fflush(stderr);
     48   }
     49 }
     50 
     51 
     52 GLOBAL(void)
     53 start_progress_monitor(j_common_ptr cinfo, cd_progress_ptr progress)
     54 {
     55   /* Enable progress display, unless trace output is on */
     56   if (cinfo->err->trace_level == 0) {
     57     progress->pub.progress_monitor = progress_monitor;
     58     progress->completed_extra_passes = 0;
     59     progress->total_extra_passes = 0;
     60     progress->percent_done = -1;
     61     cinfo->progress = &progress->pub;
     62   }
     63 }
     64 
     65 
     66 GLOBAL(void)
     67 end_progress_monitor(j_common_ptr cinfo)
     68 {
     69   /* Clear away progress display */
     70   if (cinfo->err->trace_level == 0) {
     71     fprintf(stderr, "\r                \r");
     72     fflush(stderr);
     73   }
     74 }
     75 
     76 #endif
     77 
     78 
     79 /*
     80  * Case-insensitive matching of possibly-abbreviated keyword switches.
     81  * keyword is the constant keyword (must be lower case already),
     82  * minchars is length of minimum legal abbreviation.
     83  */
     84 
     85 GLOBAL(boolean)
     86 keymatch(char *arg, const char *keyword, int minchars)
     87 {
     88   register int ca, ck;
     89   register int nmatched = 0;
     90 
     91   while ((ca = *arg++) != '\0') {
     92     if ((ck = *keyword++) == '\0')
     93       return FALSE;             /* arg longer than keyword, no good */
     94     if (isupper(ca))            /* force arg to lcase (assume ck is already) */
     95       ca = tolower(ca);
     96     if (ca != ck)
     97       return FALSE;             /* no good */
     98     nmatched++;                 /* count matched characters */
     99   }
    100   /* reached end of argument; fail if it's too short for unique abbrev */
    101   if (nmatched < minchars)
    102     return FALSE;
    103   return TRUE;                  /* A-OK */
    104 }
    105 
    106 
    107 /*
    108  * Routines to establish binary I/O mode for stdin and stdout.
    109  * Non-Unix systems often require some hacking to get out of text mode.
    110  */
    111 
    112 GLOBAL(FILE *)
    113 read_stdin(void)
    114 {
    115   FILE *input_file = stdin;
    116 
    117 #ifdef USE_SETMODE              /* need to hack file mode? */
    118   setmode(fileno(stdin), O_BINARY);
    119 #endif
    120 #ifdef USE_FDOPEN               /* need to re-open in binary mode? */
    121   if ((input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
    122     fprintf(stderr, "Cannot reopen stdin\n");
    123     exit(EXIT_FAILURE);
    124   }
    125 #endif
    126   return input_file;
    127 }
    128 
    129 
    130 GLOBAL(FILE *)
    131 write_stdout(void)
    132 {
    133   FILE *output_file = stdout;
    134 
    135 #ifdef USE_SETMODE              /* need to hack file mode? */
    136   setmode(fileno(stdout), O_BINARY);
    137 #endif
    138 #ifdef USE_FDOPEN               /* need to re-open in binary mode? */
    139   if ((output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
    140     fprintf(stderr, "Cannot reopen stdout\n");
    141     exit(EXIT_FAILURE);
    142   }
    143 #endif
    144   return output_file;
    145 }
    146