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cc7150e281
libjpeg-turbo/jcmain.c
Thomas G. Lane cc7150e281 The Independent JPEG Group's JPEG software v4a
2015-07-29 15:25:01 -05:00

734 lines
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/*
* jcmain.c
*
* Copyright (C) 1991, 1992, 1993, Thomas G. Lane.
* This file is part of the Independent JPEG Group's software.
* For conditions of distribution and use, see the accompanying README 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.
*/
#include "jinclude.h"
#ifdef INCLUDES_ARE_ANSI
#include <stdlib.h> /* to declare exit() */
#endif
#include <ctype.h> /* to declare isupper(), tolower() */
#ifdef NEED_SIGNAL_CATCHER
#include <signal.h> /* to declare signal() */
#endif
#ifdef USE_SETMODE
#include <fcntl.h> /* to declare setmode() */
#endif
#ifdef THINK_C
#include <console.h> /* command-line reader for Macintosh */
#endif
#ifdef DONT_USE_B_MODE /* define mode parameters for fopen() */
#define READ_BINARY "r"
#define WRITE_BINARY "w"
#else
#define READ_BINARY "rb"
#define WRITE_BINARY "wb"
#endif
#ifndef EXIT_FAILURE /* define exit() codes if not provided */
#define EXIT_FAILURE 1
#endif
#ifndef EXIT_SUCCESS
#ifdef VMS
#define EXIT_SUCCESS 1 /* VMS is very nonstandard */
#else
#define EXIT_SUCCESS 0
#endif
#endif
#include "jversion.h" /* for version message */
/*
* 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 as is done in djpeg (breaks input readers
* that want to use stdio directly, such as the RLE library);
* or 4) don't put back the data, and modify the input_init methods to assume
* they start reading after the start of file (also breaks RLE library).
* #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 void
select_file_type (compress_info_ptr cinfo)
{
int c;
if (is_targa) {
#ifdef TARGA_SUPPORTED
jselrtarga(cinfo);
#else
ERREXIT(cinfo->emethods, "Targa support was not compiled");
#endif
return;
}
if ((c = getc(cinfo->input_file)) == EOF)
ERREXIT(cinfo->emethods, "Empty input file");
switch (c) {
#ifdef GIF_SUPPORTED
case 'G':
jselrgif(cinfo);
break;
#endif
#ifdef PPM_SUPPORTED
case 'P':
jselrppm(cinfo);
break;
#endif
#ifdef RLE_SUPPORTED
case 'R':
jselrrle(cinfo);
break;
#endif
#ifdef TARGA_SUPPORTED
case 0x00:
jselrtarga(cinfo);
break;
#endif
default:
#ifdef TARGA_SUPPORTED
ERREXIT(cinfo->emethods, "Unrecognized input file format --- perhaps you need -targa");
#else
ERREXIT(cinfo->emethods, "Unrecognized input file format");
#endif
break;
}
if (ungetc(c, cinfo->input_file) == EOF)
ERREXIT(cinfo->emethods, "ungetc failed");
}
/*
* This routine gets control after the input file header has been read.
* It must determine what output JPEG file format is to be written,
* and make any other compression parameter changes that are desirable.
*/
METHODDEF void
c_ui_method_selection (compress_info_ptr cinfo)
{
/* If the input is gray scale, generate a monochrome JPEG file. */
if (cinfo->in_color_space == CS_GRAYSCALE)
j_monochrome_default(cinfo);
/* For now, always select JFIF output format. */
#ifdef JFIF_SUPPORTED
jselwjfif(cinfo);
#else
You shoulda defined JFIF_SUPPORTED. /* deliberate syntax error */
#endif
}
/*
* Signal catcher to ensure that temporary files are removed before aborting.
* NB: for Amiga Manx C this is actually a global routine named _abort();
* see -Dsignal_catcher=_abort in CFLAGS. Talk about bogus...
*/
#ifdef NEED_SIGNAL_CATCHER
static external_methods_ptr emethods; /* for access to free_all */
GLOBAL void
signal_catcher (int signum)
{
if (emethods != NULL) {
emethods->trace_level = 0; /* turn off trace output */
(*emethods->free_all) (); /* clean up memory allocation & temp files */
}
exit(EXIT_FAILURE);
}
#endif
/*
* Optional routine to display a percent-done figure on stderr.
* See jcdeflts.c for explanation of the information used.
*/
#ifdef PROGRESS_REPORT
METHODDEF void
progress_monitor (compress_info_ptr cinfo, long loopcounter, long looplimit)
{
if (cinfo->total_passes > 1) {
fprintf(stderr, "\rPass %d/%d: %3d%% ",
cinfo->completed_passes+1, cinfo->total_passes,
(int) (loopcounter*100L/looplimit));
} else {
fprintf(stderr, "\r %3d%% ",
(int) (loopcounter*100L/looplimit));
}
fflush(stderr);
}
#endif
/*
* 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 char * progname; /* program name for error messages */
static char * outfilename; /* for -outfile switch */
LOCAL void
usage (void)
/* complain about bad command line */
{
fprintf(stderr, "usage: %s [switches] ", progname);
#ifdef TWO_FILE_COMMANDLINE
fprintf(stderr, "inputfile outputfile\n");
#else
fprintf(stderr, "[inputfile]\n");
#endif
fprintf(stderr, "Switches (names may be abbreviated):\n");
fprintf(stderr, " -quality N Compression quality (0..100; 5-95 is useful range)\n");
fprintf(stderr, " -grayscale Create monochrome JPEG file\n");
#ifdef ENTROPY_OPT_SUPPORTED
fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");
#endif
#ifdef TARGA_SUPPORTED
fprintf(stderr, " -targa Input file is Targa format (usually not needed)\n");
#endif
fprintf(stderr, "Switches for advanced users:\n");
fprintf(stderr, " -restart N Set restart interval in rows, or in blocks with B\n");
#ifdef INPUT_SMOOTHING_SUPPORTED
fprintf(stderr, " -smooth N Smooth dithered input (N=1..100 is strength)\n");
#endif
fprintf(stderr, " -maxmemory N Maximum memory to use (in kbytes)\n");
fprintf(stderr, " -verbose or -debug Emit debug output\n");
fprintf(stderr, "Switches for wizards:\n");
#ifdef C_ARITH_CODING_SUPPORTED
fprintf(stderr, " -arithmetic Use arithmetic coding\n");
#endif
#ifdef C_MULTISCAN_FILES_SUPPORTED
fprintf(stderr, " -nointerleave Create noninterleaved JPEG file\n");
#endif
fprintf(stderr, " -qtables file Use quantization tables given in file\n");
fprintf(stderr, " -sample HxV[,...] Set JPEG sampling factors\n");
exit(EXIT_FAILURE);
}
LOCAL boolean
keymatch (char * arg, const char * keyword, int minchars)
/* Case-insensitive matching of (possibly abbreviated) keyword switches. */
/* keyword is the constant keyword (must be lower case already), */
/* minchars is length of minimum legal abbreviation. */
{
register int ca, ck;
register int nmatched = 0;
while ((ca = *arg++) != '\0') {
if ((ck = *keyword++) == '\0')
return FALSE; /* arg longer than keyword, no good */
if (isupper(ca)) /* force arg to lcase (assume ck is already) */
ca = tolower(ca);
if (ca != ck)
return FALSE; /* no good */
nmatched++; /* count matched characters */
}
/* reached end of argument; fail if it's too short for unique abbrev */
if (nmatched < minchars)
return FALSE;
return TRUE; /* A-OK */
}
LOCAL int
qt_getc (FILE * file)
/* Read next char, skipping over any comments (# to end of line) */
/* A comment/newline sequence is returned as a newline */
{
register int ch;
ch = getc(file);
if (ch == '#') {
do {
ch = getc(file);
} while (ch != '\n' && ch != EOF);
}
return ch;
}
LOCAL long
read_qt_integer (FILE * file)
/* Read an unsigned decimal integer from a quantization-table file */
/* Swallows one trailing character after the integer */
{
register int ch;
register long val;
/* Skip any leading whitespace, detect EOF */
do {
ch = qt_getc(file);
if (ch == EOF)
return EOF;
} while (isspace(ch));
if (! isdigit(ch)) {
fprintf(stderr, "%s: bogus data in quantization file\n", progname);
exit(EXIT_FAILURE);
}
val = ch - '0';
while (ch = qt_getc(file), isdigit(ch)) {
val *= 10;
val += ch - '0';
}
return val;
}
LOCAL void
read_quant_tables (compress_info_ptr cinfo, char * filename, int scale_factor)
/* Read a set of quantization tables from the specified file.
* The file is plain ASCII text: decimal numbers with whitespace between.
* Comments preceded by '#' may be included in the file.
* There may be one to NUM_QUANT_TBLS tables in the file, each of 64 values.
* The tables are implicitly numbered 0,1,etc.
*/
{
/* ZIG[i] is the zigzag-order position of the i'th element of a DCT block */
/* read in natural order (left to right, top to bottom). */
static const short ZIG[DCTSIZE2] = {
0, 1, 5, 6, 14, 15, 27, 28,
2, 4, 7, 13, 16, 26, 29, 42,
3, 8, 12, 17, 25, 30, 41, 43,
9, 11, 18, 24, 31, 40, 44, 53,
10, 19, 23, 32, 39, 45, 52, 54,
20, 22, 33, 38, 46, 51, 55, 60,
21, 34, 37, 47, 50, 56, 59, 61,
35, 36, 48, 49, 57, 58, 62, 63
};
FILE * fp;
int tblno, i;
long val;
QUANT_TBL table;
if ((fp = fopen(filename, "r")) == NULL) {
fprintf(stderr, "%s: can't open %s\n", progname, filename);
exit(EXIT_FAILURE);
}
tblno = 0;
while ((val = read_qt_integer(fp)) != EOF) { /* read 1st element of table */
if (tblno >= NUM_QUANT_TBLS) {
fprintf(stderr, "%s: too many tables in file %s\n", progname, filename);
exit(EXIT_FAILURE);
}
table[0] = (QUANT_VAL) val;
for (i = 1; i < DCTSIZE2; i++) {
if ((val = read_qt_integer(fp)) == EOF) {
fprintf(stderr, "%s: incomplete table in file %s\n", progname, filename);
exit(EXIT_FAILURE);
}
table[ZIG[i]] = (QUANT_VAL) val;
}
j_add_quant_table(cinfo, tblno, table, scale_factor, FALSE);
tblno++;
}
fclose(fp);
}
LOCAL void
set_sample_factors (compress_info_ptr cinfo, char *arg)
/* Process a sample-factors parameter string, of the form */
/* HxV[,HxV,...] */
{
#define MAX_COMPONENTS 4 /* # of comp_info slots made by jcdeflts.c */
int ci, val1, val2;
char ch1, ch2;
for (ci = 0; ci < MAX_COMPONENTS; ci++) {
if (*arg) {
ch2 = ','; /* if not set by sscanf, will be ',' */
if (sscanf(arg, "%d%c%d%c", &val1, &ch1, &val2, &ch2) < 3)
usage();
if ((ch1 != 'x' && ch1 != 'X') || ch2 != ',')
usage(); /* syntax check */
if (val1 <= 0 || val1 > 4 || val2 <= 0 || val2 > 4) {
fprintf(stderr, "JPEG sampling factors must be 1..4\n");
exit(EXIT_FAILURE);
}
cinfo->comp_info[ci].h_samp_factor = val1;
cinfo->comp_info[ci].v_samp_factor = val2;
while (*arg && *arg++ != ',') /* advance to next segment of arg string */
;
} else {
/* reached end of parameter, set remaining components to 1x1 sampling */
cinfo->comp_info[ci].h_samp_factor = 1;
cinfo->comp_info[ci].v_samp_factor = 1;
}
}
}
LOCAL int
parse_switches (compress_info_ptr cinfo, int last_file_arg_seen,
int argc, char **argv)
/* Initialize cinfo with default switch settings, then parse option 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.)
*/
{
int argn;
char * arg;
char * qtablefile = NULL; /* saves -qtables filename if any */
int q_scale_factor = 100; /* default to no scaling for -qtables */
/* (Re-)initialize the system-dependent error and memory managers. */
jselerror(cinfo->emethods); /* error/trace message routines */
jselmemmgr(cinfo->emethods); /* memory allocation routines */
cinfo->methods->c_ui_method_selection = c_ui_method_selection;
/* Now OK to enable signal catcher. */
#ifdef NEED_SIGNAL_CATCHER
emethods = cinfo->emethods;
#endif
/* Set up default JPEG parameters. */
/* Note that default -quality level here need not, and does not,
* match the default scaling for an explicit -qtables argument.
*/
j_c_defaults(cinfo, 75, FALSE); /* default quality level = 75 */
is_targa = FALSE;
outfilename = NULL;
/* Scan command line options, adjust parameters */
for (argn = 1; argn < argc; argn++) {
arg = argv[argn];
if (*arg != '-') {
/* Not a switch, must be a file name argument */
if (argn <= last_file_arg_seen) {
outfilename = NULL; /* -outfile applies to just one input file */
continue; /* ignore this name if previously processed */
}
break; /* else done parsing switches */
}
arg++; /* advance past switch marker character */
if (keymatch(arg, "arithmetic", 1)) {
/* Use arithmetic coding. */
#ifdef C_ARITH_CODING_SUPPORTED
cinfo->arith_code = TRUE;
#else
fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
progname);
exit(EXIT_FAILURE);
#endif
} else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
/* Enable debug printouts. */
/* On first -d, print version identification */
if (last_file_arg_seen == 0 && cinfo->emethods->trace_level == 0)
fprintf(stderr, "Independent JPEG Group's CJPEG, version %s\n%s\n",
JVERSION, JCOPYRIGHT);
cinfo->emethods->trace_level++;
} else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
/* Force a monochrome JPEG file to be generated. */
j_monochrome_default(cinfo);
} else if (keymatch(arg, "maxmemory", 1)) {
/* Maximum memory in Kb (or Mb with 'm'). */
long lval;
char ch = 'x';
if (++argn >= argc) /* advance to next argument */
usage();
if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
usage();
if (ch == 'm' || ch == 'M')
lval *= 1000L;
cinfo->emethods->max_memory_to_use = lval * 1000L;
} else if (keymatch(arg, "nointerleave", 3)) {
/* Create noninterleaved file. */
#ifdef C_MULTISCAN_FILES_SUPPORTED
cinfo->interleave = FALSE;
#else
fprintf(stderr, "%s: sorry, multiple-scan support was not compiled\n",
progname);
exit(EXIT_FAILURE);
#endif
} else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
/* Enable entropy parm optimization. */
#ifdef ENTROPY_OPT_SUPPORTED
cinfo->optimize_coding = TRUE;
#else
fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
progname);
exit(EXIT_FAILURE);
#endif
} else if (keymatch(arg, "outfile", 3)) {
/* Set output file name. */
if (++argn >= argc) /* advance to next argument */
usage();
outfilename = argv[argn]; /* save it away for later use */
} else if (keymatch(arg, "quality", 1)) {
/* Quality factor (quantization table scaling factor). */
int val;
if (++argn >= argc) /* advance to next argument */
usage();
if (sscanf(argv[argn], "%d", &val) != 1)
usage();
/* Set quantization tables (will be overridden if -qtables also given).
* Note: we make force_baseline FALSE.
* This means non-baseline JPEG files can be created with low Q values.
* To ensure only baseline files are generated, pass TRUE instead.
*/
j_set_quality(cinfo, val, FALSE);
/* Change scale factor in case -qtables is present. */
q_scale_factor = j_quality_scaling(val);
} else if (keymatch(arg, "qtables", 2)) {
/* Quantization tables fetched from file. */
if (++argn >= argc) /* advance to next argument */
usage();
qtablefile = argv[argn];
/* we postpone actually reading the file in case -quality comes later */
} else if (keymatch(arg, "restart", 1)) {
/* Restart interval in MCU rows (or in MCUs with 'b'). */
long lval;
char ch = 'x';
if (++argn >= argc) /* advance to next argument */
usage();
if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
usage();
if (lval < 0 || lval > 65535L)
usage();
if (ch == 'b' || ch == 'B')
cinfo->restart_interval = (UINT16) lval;
else
cinfo->restart_in_rows = (int) lval;
} else if (keymatch(arg, "sample", 2)) {
/* Set sampling factors. */
if (++argn >= argc) /* advance to next argument */
usage();
set_sample_factors(cinfo, argv[argn]);
} else if (keymatch(arg, "smooth", 2)) {
/* Set input smoothing factor. */
int val;
if (++argn >= argc) /* advance to next argument */
usage();
if (sscanf(argv[argn], "%d", &val) != 1)
usage();
if (val < 0 || val > 100)
usage();
cinfo->smoothing_factor = val;
} else if (keymatch(arg, "targa", 1)) {
/* Input file is Targa format. */
is_targa = TRUE;
} else {
usage(); /* bogus switch */
}
}
/* Post-switch-scanning cleanup */
if (qtablefile != NULL) /* process -qtables if it was present */
read_quant_tables(cinfo, qtablefile, q_scale_factor);
return argn; /* return index of next arg (file name) */
}
/*
* The main program.
*/
GLOBAL int
main (int argc, char **argv)
{
struct Compress_info_struct cinfo;
struct Compress_methods_struct c_methods;
struct External_methods_struct e_methods;
int file_index;
/* On Mac, fetch a command line. */
#ifdef THINK_C
argc = ccommand(&argv);
#endif
progname = argv[0];
/* Set up links to method structures. */
cinfo.methods = &c_methods;
cinfo.emethods = &e_methods;
/* Install, but don't yet enable signal catcher. */
#ifdef NEED_SIGNAL_CATCHER
emethods = NULL;
signal(SIGINT, signal_catcher);
#ifdef SIGTERM /* not all systems have SIGTERM */
signal(SIGTERM, signal_catcher);
#endif
#endif
/* Scan command line: set up compression parameters, find file names. */
file_index = parse_switches(&cinfo, 0, argc, argv);
#ifdef TWO_FILE_COMMANDLINE
/* Must have either -outfile switch or explicit output file name */
if (outfilename == NULL) {
if (file_index != argc-2) {
fprintf(stderr, "%s: must name one input and one output file\n",
progname);
usage();
}
outfilename = argv[file_index+1];
} else {
if (file_index != argc-1) {
fprintf(stderr, "%s: must name one input and one output file\n",
progname);
usage();
}
}
#else
/* Unix style: expect zero or one file name */
if (file_index < argc-1) {
fprintf(stderr, "%s: only one input file\n", progname);
usage();
}
#endif /* TWO_FILE_COMMANDLINE */
/* Open the input file. */
if (file_index < argc) {
if ((cinfo.input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
exit(EXIT_FAILURE);
}
} else {
/* default input file is stdin */
#ifdef USE_SETMODE /* need to hack file mode? */
setmode(fileno(stdin), O_BINARY);
#endif
#ifdef USE_FDOPEN /* need to re-open in binary mode? */
if ((cinfo.input_file = fdopen(fileno(stdin), READ_BINARY)) == NULL) {
fprintf(stderr, "%s: can't open stdin\n", progname);
exit(EXIT_FAILURE);
}
#else
cinfo.input_file = stdin;
#endif
}
/* Open the output file. */
if (outfilename != NULL) {
if ((cinfo.output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
exit(EXIT_FAILURE);
}
} else {
/* default output file is stdout */
#ifdef USE_SETMODE /* need to hack file mode? */
setmode(fileno(stdout), O_BINARY);
#endif
#ifdef USE_FDOPEN /* need to re-open in binary mode? */
if ((cinfo.output_file = fdopen(fileno(stdout), WRITE_BINARY)) == NULL) {
fprintf(stderr, "%s: can't open stdout\n", progname);
exit(EXIT_FAILURE);
}
#else
cinfo.output_file = stdout;
#endif
}
/* Figure out the input file format, and set up to read it. */
select_file_type(&cinfo);
#ifdef PROGRESS_REPORT
/* Start up progress display, unless trace output is on */
if (e_methods.trace_level == 0)
c_methods.progress_monitor = progress_monitor;
#endif
/* Do it to it! */
jpeg_compress(&cinfo);
#ifdef PROGRESS_REPORT
/* Clear away progress display */
if (e_methods.trace_level == 0) {
fprintf(stderr, "\r \r");
fflush(stderr);
}
#endif
/* All done. */
exit(EXIT_SUCCESS);
return 0; /* suppress no-return-value warnings */
}
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