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
