chromium/third_party/libjpeg_turbo/cjpeg.c

/*
 * cjpeg.c
 *
 * This file was part of the Independent JPEG Group's software:
 * Copyright (C) 1991-1998, Thomas G. Lane.
 * Modified 2003-2011 by Guido Vollbeding.
 * libjpeg-turbo Modifications:
 * Copyright (C) 2010, 2013-2014, 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 the JPEG compressor.
 * It should work on any system with Unix- or MS-DOS-style command lines.
 *
 * Two different command line styles are permitted, depending on the
 * compile-time switch TWO_FILE_COMMANDLINE:
 *      cjpeg [options]  inputfile outputfile
 *      cjpeg [options]  [inputfile]
 * In the second style, output is always to standard output, which you'd
 * normally redirect to a file or pipe to some other program.  Input is
 * either from a named file or from standard input (typically redirected).
 * The second style is convenient on Unix but is unhelpful on systems that
 * don't support pipes.  Also, you MUST use the first style if your system
 * doesn't do binary I/O to stdin/stdout.
 * To simplify script writing, the "-outfile" switch is provided.  The syntax
 *      cjpeg [options]  -outfile outputfile  inputfile
 * works regardless of which command line style is used.
 */

#ifdef _MSC_VER
#define _CRT_SECURE_NO_DEPRECATE
#endif

#ifdef CJPEG_FUZZER
#define JPEG_INTERNALS
#endif
#include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
#include "jversion.h"           /* for version message */
#include "jconfigint.h"


/* Create the add-on message string table. */

#define JMESSAGE …

static const char * const cdjpeg_message_table[] = …;


/*
 * This routine determines what format the input file is,
 * and selects the appropriate input-reading module.
 *
 * To determine which family of input formats the file belongs to,
 * we may look only at the first byte of the file, since C does not
 * guarantee that more than one character can be pushed back with ungetc.
 * Looking at additional bytes would require one of these approaches:
 *     1) assume we can fseek() the input file (fails for piped input);
 *     2) assume we can push back more than one character (works in
 *        some C implementations, but unportable);
 *     3) provide our own buffering (breaks input readers that want to use
 *        stdio directly);
 * or  4) don't put back the data, and modify the input_init methods to assume
 *        they start reading after the start of file.
 * #1 is attractive for MS-DOS but is untenable on Unix.
 *
 * The most portable solution for file types that can't be identified by their
 * first byte is to make the user tell us what they are.  This is also the
 * only approach for "raw" file types that contain only arbitrary values.
 * We presently apply this method for Targa files.  Most of the time Targa
 * files start with 0x00, so we recognize that case.  Potentially, however,
 * a Targa file could start with any byte value (byte 0 is the length of the
 * seldom-used ID field), so we provide a switch to force Targa input mode.
 */

static boolean is_targa;        /* records user -targa switch */


LOCAL(cjpeg_source_ptr)
select_file_type(j_compress_ptr cinfo, FILE *infile)
{ … }


/*
 * 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 char *outfilename;       /* for -outfile switch */
boolean memdst;                 /* for -memdst switch */
boolean report;                 /* for -report switch */
boolean strict;                 /* for -strict switch */


#ifdef CJPEG_FUZZER

#include <setjmp.h>

struct my_error_mgr {
  struct jpeg_error_mgr pub;
  jmp_buf setjmp_buffer;
};

void my_error_exit(j_common_ptr cinfo)
{
  struct my_error_mgr *myerr = (struct my_error_mgr *)cinfo->err;

  longjmp(myerr->setjmp_buffer, 1);
}

static void my_emit_message_fuzzer(j_common_ptr cinfo, int msg_level)
{
  if (msg_level < 0)
    cinfo->err->num_warnings++;
}

#define HANDLE_ERROR …

#endif


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


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
cjpeg(int argc, char **argv)
#else
main(int argc, char **argv)
#endif
{ … }