7e3acc0e0a
The IJG README file has been renamed to README.ijg, in order to avoid confusion (many people were assuming that that was our project's README file and weren't reading README-turbo.txt) and to lay the groundwork for markdown versions of the libjpeg-turbo README and build instructions.
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
/*
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* cdjpeg.c
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1991-1997, Thomas G. Lane.
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* It was modified by The libjpeg-turbo Project to include only code relevant
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* to libjpeg-turbo.
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* For conditions of distribution and use, see the accompanying README.ijg
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* file.
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*
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* This file contains common support routines used by the IJG application
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* programs (cjpeg, djpeg, jpegtran).
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*/
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#include "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
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#include <ctype.h> /* to declare isupper(), tolower() */
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#ifdef USE_SETMODE
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#include <fcntl.h> /* to declare setmode()'s parameter macros */
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/* If you have setmode() but not <io.h>, just delete this line: */
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#include <io.h> /* to declare setmode() */
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#endif
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/*
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* Optional progress monitor: display a percent-done figure on stderr.
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*/
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#ifdef PROGRESS_REPORT
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METHODDEF(void)
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progress_monitor (j_common_ptr cinfo)
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{
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cd_progress_ptr prog = (cd_progress_ptr) cinfo->progress;
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int total_passes = prog->pub.total_passes + prog->total_extra_passes;
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int percent_done = (int) (prog->pub.pass_counter*100L/prog->pub.pass_limit);
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if (percent_done != prog->percent_done) {
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prog->percent_done = percent_done;
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if (total_passes > 1) {
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fprintf(stderr, "\rPass %d/%d: %3d%% ",
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prog->pub.completed_passes + prog->completed_extra_passes + 1,
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total_passes, percent_done);
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} else {
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fprintf(stderr, "\r %3d%% ", percent_done);
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}
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fflush(stderr);
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}
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}
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GLOBAL(void)
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start_progress_monitor (j_common_ptr cinfo, cd_progress_ptr progress)
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{
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/* Enable progress display, unless trace output is on */
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if (cinfo->err->trace_level == 0) {
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progress->pub.progress_monitor = progress_monitor;
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progress->completed_extra_passes = 0;
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progress->total_extra_passes = 0;
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progress->percent_done = -1;
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cinfo->progress = &progress->pub;
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}
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}
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GLOBAL(void)
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end_progress_monitor (j_common_ptr cinfo)
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{
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/* Clear away progress display */
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if (cinfo->err->trace_level == 0) {
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fprintf(stderr, "\r \r");
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fflush(stderr);
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}
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}
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#endif
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/*
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* Case-insensitive matching of possibly-abbreviated keyword switches.
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* keyword is the constant keyword (must be lower case already),
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* minchars is length of minimum legal abbreviation.
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*/
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GLOBAL(boolean)
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keymatch (char * arg, const char * keyword, int minchars)
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{
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register int ca, ck;
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register int nmatched = 0;
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while ((ca = *arg++) != '\0') {
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if ((ck = *keyword++) == '\0')
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return FALSE; /* arg longer than keyword, no good */
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if (isupper(ca)) /* force arg to lcase (assume ck is already) */
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ca = tolower(ca);
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if (ca != ck)
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return FALSE; /* no good */
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nmatched++; /* count matched characters */
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}
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/* reached end of argument; fail if it's too short for unique abbrev */
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if (nmatched < minchars)
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return FALSE;
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return TRUE; /* A-OK */
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}
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/*
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* Routines to establish binary I/O mode for stdin and stdout.
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* Non-Unix systems often require some hacking to get out of text mode.
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*/
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GLOBAL(FILE *)
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read_stdin (void)
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{
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FILE * input_file = stdin;
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#ifdef USE_SETMODE /* need to hack file mode? */
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setmode(fileno(stdin), O_BINARY);
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#endif
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#ifdef USE_FDOPEN /* need to re-open in binary mode? */
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if ((input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
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fprintf(stderr, "Cannot reopen stdin\n");
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exit(EXIT_FAILURE);
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}
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#endif
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return input_file;
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}
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GLOBAL(FILE *)
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write_stdout (void)
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{
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FILE * output_file = stdout;
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#ifdef USE_SETMODE /* need to hack file mode? */
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setmode(fileno(stdout), O_BINARY);
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#endif
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#ifdef USE_FDOPEN /* need to re-open in binary mode? */
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if ((output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
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fprintf(stderr, "Cannot reopen stdout\n");
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exit(EXIT_FAILURE);
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}
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#endif
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return output_file;
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}
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