chromium/third_party/libjpeg_turbo/jpegtran.c

/*
 * jpegtran.c
 *
 * This file was part of the Independent JPEG Group's software:
 * Copyright (C) 1995-2019, Thomas G. Lane, Guido Vollbeding.
 * libjpeg-turbo Modifications:
 * Copyright (C) 2010, 2014, 2017, 2019-2022, D. R. Commander.
 * For conditions of distribution and use, see the accompanying README.ijg
 * file.
 *
 * This file contains a command-line user interface for JPEG transcoding.
 * It is very similar to cjpeg.c, and partly to djpeg.c, but provides
 * lossless transcoding between different JPEG file formats.  It also
 * provides some lossless and sort-of-lossless transformations of JPEG data.
 */

#ifdef _MSC_VER
#define _CRT_SECURE_NO_DEPRECATE
#endif

#include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
#include "transupp.h"           /* Support routines for jpegtran */
#include "jversion.h"           /* for version message */
#include "jconfigint.h"


/*
 * Argument-parsing code.
 * The switch parser is designed to be useful with DOS-style command line
 * syntax, ie, intermixed switches and file names, where only the switches
 * to the left of a given file name affect processing of that file.
 * The main program in this file doesn't actually use this capability...
 */


static const char *progname;    /* program name for error messages */
static char *icc_filename;      /* for -icc switch */
static JDIMENSION max_scans;    /* for -maxscans switch */
static char *outfilename;       /* for -outfile switch */
static char *dropfilename;      /* for -drop switch */
static boolean report;          /* for -report switch */
static boolean strict;          /* for -strict switch */
static JCOPY_OPTION copyoption; /* -copy switch */
static jpeg_transform_info transformoption; /* image transformation options */


LOCAL(void)
usage(void)
/* complain about bad command line */
{ … }


LOCAL(void)
select_transform(JXFORM_CODE transform)
/* Silly little routine to detect multiple transform options,
 * which we can't handle.
 */
{ … }


LOCAL(int)
parse_switches(j_compress_ptr cinfo, int argc, char **argv,
               int last_file_arg_seen, boolean for_real)
/* Parse optional switches.
 * Returns argv[] index of first file-name argument (== argc if none).
 * Any file names with indexes <= last_file_arg_seen are ignored;
 * they have presumably been processed in a previous iteration.
 * (Pass 0 for last_file_arg_seen on the first or only iteration.)
 * for_real is FALSE on the first (dummy) pass; we may skip any expensive
 * processing.
 */
{ … }


METHODDEF(void)
my_emit_message(j_common_ptr cinfo, int msg_level)
{ … }


/*
 * The main program.
 */

int
#ifdef GTEST
jpegtran(int argc, char **argv)
#else
main(int argc, char **argv)
#endif
{ … }