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      1 /*
      2  * cdjpeg.c
      3  *
      4  * Copyright (C) 1991-1997, Thomas G. Lane.
      5  * This file is part of the Independent JPEG Group's software.
      6  * For conditions of distribution and use, see the accompanying README file.
      7  *
      8  * This file contains common support routines used by the IJG application
      9  * programs (cjpeg, djpeg, jpegtran).
     10  */
     11 
     12 #include "cdjpeg.h"		/* Common decls for cjpeg/djpeg applications */
     13 #include <ctype.h>		/* to declare isupper(), tolower() */
     14 #ifdef NEED_SIGNAL_CATCHER
     15 #include <signal.h>		/* to declare signal() */
     16 #endif
     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  * Signal catcher to ensure that temporary files are removed before aborting.
     26  * NB: for Amiga Manx C this is actually a global routine named _abort();
     27  * we put "#define signal_catcher _abort" in jconfig.h.  Talk about bogus...
     28  */
     29 
     30 #ifdef NEED_SIGNAL_CATCHER
     31 
     32 static j_common_ptr sig_cinfo;
     33 
     34 void				/* must be global for Manx C */
     35 signal_catcher (int signum)
     36 {
     37   if (sig_cinfo != NULL) {
     38     if (sig_cinfo->err != NULL) /* turn off trace output */
     39       sig_cinfo->err->trace_level = 0;
     40     jpeg_destroy(sig_cinfo);	/* clean up memory allocation & temp files */
     41   }
     42   exit(EXIT_FAILURE);
     43 }
     44 
     45 
     46 GLOBAL(void)
     47 enable_signal_catcher (j_common_ptr cinfo)
     48 {
     49   sig_cinfo = cinfo;
     50 #ifdef SIGINT			/* not all systems have SIGINT */
     51   signal(SIGINT, signal_catcher);
     52 #endif
     53 #ifdef SIGTERM			/* not all systems have SIGTERM */
     54   signal(SIGTERM, signal_catcher);
     55 #endif
     56 }
     57 
     58 #endif
     59 
     60 
     61 /*
     62  * Optional progress monitor: display a percent-done figure on stderr.
     63  */
     64 
     65 #ifdef PROGRESS_REPORT
     66 
     67 METHODDEF(void)
     68 progress_monitor (j_common_ptr cinfo)
     69 {
     70   cd_progress_ptr prog = (cd_progress_ptr) cinfo->progress;
     71   int total_passes = prog->pub.total_passes + prog->total_extra_passes;
     72   int percent_done = (int) (prog->pub.pass_counter*100L/prog->pub.pass_limit);
     73 
     74   if (percent_done != prog->percent_done) {
     75     prog->percent_done = percent_done;
     76     if (total_passes > 1) {
     77       fprintf(stderr, "\rPass %d/%d: %3d%% ",
     78 	      prog->pub.completed_passes + prog->completed_extra_passes + 1,
     79 	      total_passes, percent_done);
     80     } else {
     81       fprintf(stderr, "\r %3d%% ", percent_done);
     82     }
     83     fflush(stderr);
     84   }
     85 }
     86 
     87 
     88 GLOBAL(void)
     89 start_progress_monitor (j_common_ptr cinfo, cd_progress_ptr progress)
     90 {
     91   /* Enable progress display, unless trace output is on */
     92   if (cinfo->err->trace_level == 0) {
     93     progress->pub.progress_monitor = progress_monitor;
     94     progress->completed_extra_passes = 0;
     95     progress->total_extra_passes = 0;
     96     progress->percent_done = -1;
     97     cinfo->progress = &progress->pub;
     98   }
     99 }
    100 
    101 
    102 GLOBAL(void)
    103 end_progress_monitor (j_common_ptr cinfo)
    104 {
    105   /* Clear away progress display */
    106   if (cinfo->err->trace_level == 0) {
    107     fprintf(stderr, "\r                \r");
    108     fflush(stderr);
    109   }
    110 }
    111 
    112 #endif
    113 
    114 
    115 /*
    116  * Case-insensitive matching of possibly-abbreviated keyword switches.
    117  * keyword is the constant keyword (must be lower case already),
    118  * minchars is length of minimum legal abbreviation.
    119  */
    120 
    121 GLOBAL(boolean)
    122 keymatch (char * arg, const char * keyword, int minchars)
    123 {
    124   register int ca, ck;
    125   register int nmatched = 0;
    126 
    127   while ((ca = *arg++) != '\0') {
    128     if ((ck = *keyword++) == '\0')
    129       return FALSE;		/* arg longer than keyword, no good */
    130     if (isupper(ca))		/* force arg to lcase (assume ck is already) */
    131       ca = tolower(ca);
    132     if (ca != ck)
    133       return FALSE;		/* no good */
    134     nmatched++;			/* count matched characters */
    135   }
    136   /* reached end of argument; fail if it's too short for unique abbrev */
    137   if (nmatched < minchars)
    138     return FALSE;
    139   return TRUE;			/* A-OK */
    140 }
    141 
    142 
    143 /*
    144  * Routines to establish binary I/O mode for stdin and stdout.
    145  * Non-Unix systems often require some hacking to get out of text mode.
    146  */
    147 
    148 GLOBAL(FILE *)
    149 read_stdin (void)
    150 {
    151   FILE * input_file = stdin;
    152 
    153 #ifdef USE_SETMODE		/* need to hack file mode? */
    154   setmode(fileno(stdin), O_BINARY);
    155 #endif
    156 #ifdef USE_FDOPEN		/* need to re-open in binary mode? */
    157   if ((input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
    158     fprintf(stderr, "Cannot reopen stdin\n");
    159     exit(EXIT_FAILURE);
    160   }
    161 #endif
    162   return input_file;
    163 }
    164 
    165 
    166 GLOBAL(FILE *)
    167 write_stdout (void)
    168 {
    169   FILE * output_file = stdout;
    170 
    171 #ifdef USE_SETMODE		/* need to hack file mode? */
    172   setmode(fileno(stdout), O_BINARY);
    173 #endif
    174 #ifdef USE_FDOPEN		/* need to re-open in binary mode? */
    175   if ((output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
    176     fprintf(stderr, "Cannot reopen stdout\n");
    177     exit(EXIT_FAILURE);
    178   }
    179 #endif
    180   return output_file;
    181 }
    182