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-rw-r--r--jpeg/cjpeg.c643
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diff --git a/jpeg/cjpeg.c b/jpeg/cjpeg.c
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+/*
+ * cjpeg.c
+ *
+ * Copyright (C) 1991-1998, Thomas G. Lane.
+ * Modified 2003-2011 by Guido Vollbeding.
+ * 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 "cdjpeg.h" /* Common decls for cjpeg/djpeg applications */
+#include "jversion.h" /* for version message */
+
+#ifdef USE_CCOMMAND /* command-line reader for Macintosh */
+#ifdef __MWERKS__
+#include <SIOUX.h> /* Metrowerks needs this */
+#include <console.h> /* ... and this */
+#endif
+#ifdef THINK_C
+#include <console.h> /* Think declares it here */
+#endif
+#endif
+
+
+/* Create the add-on message string table. */
+
+#define JMESSAGE(code,string) string ,
+
+static const char * const cdjpeg_message_table[] = {
+#include "cderror.h"
+ NULL
+};
+
+
+/*
+ * 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, 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(cjpeg_source_ptr)
+select_file_type (j_compress_ptr cinfo, FILE * infile)
+{
+ int c;
+
+ if (is_targa) {
+#ifdef TARGA_SUPPORTED
+ return jinit_read_targa(cinfo);
+#else
+ ERREXIT(cinfo, JERR_TGA_NOTCOMP);
+#endif
+ }
+
+ if ((c = getc(infile)) == EOF)
+ ERREXIT(cinfo, JERR_INPUT_EMPTY);
+ if (ungetc(c, infile) == EOF)
+ ERREXIT(cinfo, JERR_UNGETC_FAILED);
+
+ switch (c) {
+#ifdef BMP_SUPPORTED
+ case 'B':
+ return jinit_read_bmp(cinfo);
+#endif
+#ifdef GIF_SUPPORTED
+ case 'G':
+ return jinit_read_gif(cinfo);
+#endif
+#ifdef PPM_SUPPORTED
+ case 'P':
+ return jinit_read_ppm(cinfo);
+#endif
+#ifdef RLE_SUPPORTED
+ case 'R':
+ return jinit_read_rle(cinfo);
+#endif
+#ifdef TARGA_SUPPORTED
+ case 0x00:
+ return jinit_read_targa(cinfo);
+#endif
+ default:
+ ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
+ break;
+ }
+
+ return NULL; /* suppress compiler warnings */
+}
+
+
+/*
+ * 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 * 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");
+ fprintf(stderr, " -rgb Create RGB JPEG file\n");
+#ifdef ENTROPY_OPT_SUPPORTED
+ fprintf(stderr, " -optimize Optimize Huffman table (smaller file, but slow compression)\n");
+#endif
+#ifdef C_PROGRESSIVE_SUPPORTED
+ fprintf(stderr, " -progressive Create progressive JPEG file\n");
+#endif
+#ifdef DCT_SCALING_SUPPORTED
+ fprintf(stderr, " -scale M/N Scale image by fraction M/N, eg, 1/2\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");
+#ifdef C_ARITH_CODING_SUPPORTED
+ fprintf(stderr, " -arithmetic Use arithmetic coding\n");
+#endif
+#ifdef DCT_SCALING_SUPPORTED
+ fprintf(stderr, " -block N DCT block size (1..16; default is 8)\n");
+#endif
+#ifdef DCT_ISLOW_SUPPORTED
+ fprintf(stderr, " -dct int Use integer DCT method%s\n",
+ (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
+#endif
+#ifdef DCT_IFAST_SUPPORTED
+ fprintf(stderr, " -dct fast Use fast integer DCT (less accurate)%s\n",
+ (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
+#endif
+#ifdef DCT_FLOAT_SUPPORTED
+ fprintf(stderr, " -dct float Use floating-point DCT method%s\n",
+ (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
+#endif
+ fprintf(stderr, " -nosmooth Don't use high-quality downsampling\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, " -outfile name Specify name for output file\n");
+ fprintf(stderr, " -verbose or -debug Emit debug output\n");
+ fprintf(stderr, "Switches for wizards:\n");
+ fprintf(stderr, " -baseline Force baseline quantization tables\n");
+ fprintf(stderr, " -qtables file Use quantization tables given in file\n");
+ fprintf(stderr, " -qslots N[,...] Set component quantization tables\n");
+ fprintf(stderr, " -sample HxV[,...] Set component sampling factors\n");
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+ fprintf(stderr, " -scans file Create multi-scan JPEG per script file\n");
+#endif
+ exit(EXIT_FAILURE);
+}
+
+
+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.
+ */
+{
+ int argn;
+ char * arg;
+ boolean force_baseline;
+ boolean simple_progressive;
+ char * qualityarg = NULL; /* saves -quality parm if any */
+ char * qtablefile = NULL; /* saves -qtables filename if any */
+ char * qslotsarg = NULL; /* saves -qslots parm if any */
+ char * samplearg = NULL; /* saves -sample parm if any */
+ char * scansarg = NULL; /* saves -scans parm if any */
+
+ /* Set up default JPEG parameters. */
+
+ force_baseline = FALSE; /* by default, allow 16-bit quantizers */
+ simple_progressive = FALSE;
+ is_targa = FALSE;
+ outfilename = NULL;
+ cinfo->err->trace_level = 0;
+
+ /* 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, "baseline", 2)) {
+ /* Force baseline-compatible output (8-bit quantizer values). */
+ force_baseline = TRUE;
+
+ } else if (keymatch(arg, "block", 2)) {
+ /* Set DCT block size. */
+#if defined DCT_SCALING_SUPPORTED && JPEG_LIB_VERSION_MAJOR >= 8 && \
+ (JPEG_LIB_VERSION_MAJOR > 8 || JPEG_LIB_VERSION_MINOR >= 3)
+ int val;
+
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ if (sscanf(argv[argn], "%d", &val) != 1)
+ usage();
+ if (val < 1 || val > 16)
+ usage();
+ cinfo->block_size = val;
+#else
+ fprintf(stderr, "%s: sorry, block size setting not supported\n",
+ progname);
+ exit(EXIT_FAILURE);
+#endif
+
+ } else if (keymatch(arg, "dct", 2)) {
+ /* Select DCT algorithm. */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ if (keymatch(argv[argn], "int", 1)) {
+ cinfo->dct_method = JDCT_ISLOW;
+ } else if (keymatch(argv[argn], "fast", 2)) {
+ cinfo->dct_method = JDCT_IFAST;
+ } else if (keymatch(argv[argn], "float", 2)) {
+ cinfo->dct_method = JDCT_FLOAT;
+ } else
+ usage();
+
+ } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
+ /* Enable debug printouts. */
+ /* On first -d, print version identification */
+ static boolean printed_version = FALSE;
+
+ if (! printed_version) {
+ fprintf(stderr, "Independent JPEG Group's CJPEG, version %s\n%s\n",
+ JVERSION, JCOPYRIGHT);
+ printed_version = TRUE;
+ }
+ cinfo->err->trace_level++;
+
+ } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
+ /* Force a monochrome JPEG file to be generated. */
+ jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
+
+ } else if (keymatch(arg, "rgb", 3)) {
+ /* Force an RGB JPEG file to be generated. */
+ jpeg_set_colorspace(cinfo, JCS_RGB);
+
+ } else if (keymatch(arg, "maxmemory", 3)) {
+ /* 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->mem->max_memory_to_use = lval * 1000L;
+
+ } else if (keymatch(arg, "nosmooth", 3)) {
+ /* Suppress fancy downsampling */
+ cinfo->do_fancy_downsampling = FALSE;
+
+ } 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", 4)) {
+ /* 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, "progressive", 1)) {
+ /* Select simple progressive mode. */
+#ifdef C_PROGRESSIVE_SUPPORTED
+ simple_progressive = TRUE;
+ /* We must postpone execution until num_components is known. */
+#else
+ fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
+ progname);
+ exit(EXIT_FAILURE);
+#endif
+
+ } else if (keymatch(arg, "quality", 1)) {
+ /* Quality ratings (quantization table scaling factors). */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ qualityarg = argv[argn];
+
+ } else if (keymatch(arg, "qslots", 2)) {
+ /* Quantization table slot numbers. */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ qslotsarg = argv[argn];
+ /* Must delay setting qslots until after we have processed any
+ * colorspace-determining switches, since jpeg_set_colorspace sets
+ * default quant table numbers.
+ */
+
+ } 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 = (unsigned int) lval;
+ cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
+ } else {
+ cinfo->restart_in_rows = (int) lval;
+ /* restart_interval will be computed during startup */
+ }
+
+ } else if (keymatch(arg, "sample", 2)) {
+ /* Set sampling factors. */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ samplearg = argv[argn];
+ /* Must delay setting sample factors until after we have processed any
+ * colorspace-determining switches, since jpeg_set_colorspace sets
+ * default sampling factors.
+ */
+
+ } else if (keymatch(arg, "scale", 4)) {
+ /* Scale the image by a fraction M/N. */
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ if (sscanf(argv[argn], "%d/%d",
+ &cinfo->scale_num, &cinfo->scale_denom) != 2)
+ usage();
+
+ } else if (keymatch(arg, "scans", 4)) {
+ /* Set scan script. */
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+ if (++argn >= argc) /* advance to next argument */
+ usage();
+ scansarg = argv[argn];
+ /* We must postpone reading the file in case -progressive appears. */
+#else
+ fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
+ progname);
+ exit(EXIT_FAILURE);
+#endif
+
+ } 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 (for_real) {
+
+ /* Set quantization tables for selected quality. */
+ /* Some or all may be overridden if -qtables is present. */
+ if (qualityarg != NULL) /* process -quality if it was present */
+ if (! set_quality_ratings(cinfo, qualityarg, force_baseline))
+ usage();
+
+ if (qtablefile != NULL) /* process -qtables if it was present */
+ if (! read_quant_tables(cinfo, qtablefile, force_baseline))
+ usage();
+
+ if (qslotsarg != NULL) /* process -qslots if it was present */
+ if (! set_quant_slots(cinfo, qslotsarg))
+ usage();
+
+ if (samplearg != NULL) /* process -sample if it was present */
+ if (! set_sample_factors(cinfo, samplearg))
+ usage();
+
+#ifdef C_PROGRESSIVE_SUPPORTED
+ if (simple_progressive) /* process -progressive; -scans can override */
+ jpeg_simple_progression(cinfo);
+#endif
+
+#ifdef C_MULTISCAN_FILES_SUPPORTED
+ if (scansarg != NULL) /* process -scans if it was present */
+ if (! read_scan_script(cinfo, scansarg))
+ usage();
+#endif
+ }
+
+ return argn; /* return index of next arg (file name) */
+}
+
+
+/*
+ * The main program.
+ */
+
+int
+main (int argc, char **argv)
+{
+ struct jpeg_compress_struct cinfo;
+ struct jpeg_error_mgr jerr;
+#ifdef PROGRESS_REPORT
+ struct cdjpeg_progress_mgr progress;
+#endif
+ int file_index;
+ cjpeg_source_ptr src_mgr;
+ FILE * input_file;
+ FILE * output_file;
+ JDIMENSION num_scanlines;
+
+ /* On Mac, fetch a command line. */
+#ifdef USE_CCOMMAND
+ argc = ccommand(&argv);
+#endif
+
+ progname = argv[0];
+ if (progname == NULL || progname[0] == 0)
+ progname = "cjpeg"; /* in case C library doesn't provide it */
+
+ /* Initialize the JPEG compression object with default error handling. */
+ cinfo.err = jpeg_std_error(&jerr);
+ jpeg_create_compress(&cinfo);
+ /* Add some application-specific error messages (from cderror.h) */
+ jerr.addon_message_table = cdjpeg_message_table;
+ jerr.first_addon_message = JMSG_FIRSTADDONCODE;
+ jerr.last_addon_message = JMSG_LASTADDONCODE;
+
+ /* Now safe to enable signal catcher. */
+#ifdef NEED_SIGNAL_CATCHER
+ enable_signal_catcher((j_common_ptr) &cinfo);
+#endif
+
+ /* Initialize JPEG parameters.
+ * Much of this may be overridden later.
+ * In particular, we don't yet know the input file's color space,
+ * but we need to provide some value for jpeg_set_defaults() to work.
+ */
+
+ cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
+ jpeg_set_defaults(&cinfo);
+
+ /* Scan command line to find file names.
+ * It is convenient to use just one switch-parsing routine, but the switch
+ * values read here are ignored; we will rescan the switches after opening
+ * the input file.
+ */
+
+ file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
+
+#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 ((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 */
+ input_file = read_stdin();
+ }
+
+ /* Open the output file. */
+ if (outfilename != NULL) {
+ if ((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 */
+ output_file = write_stdout();
+ }
+
+#ifdef PROGRESS_REPORT
+ start_progress_monitor((j_common_ptr) &cinfo, &progress);
+#endif
+
+ /* Figure out the input file format, and set up to read it. */
+ src_mgr = select_file_type(&cinfo, input_file);
+ src_mgr->input_file = input_file;
+
+ /* Read the input file header to obtain file size & colorspace. */
+ (*src_mgr->start_input) (&cinfo, src_mgr);
+
+ /* Now that we know input colorspace, fix colorspace-dependent defaults */
+ jpeg_default_colorspace(&cinfo);
+
+ /* Adjust default compression parameters by re-parsing the options */
+ file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
+
+ /* Specify data destination for compression */
+ jpeg_stdio_dest(&cinfo, output_file);
+
+ /* Start compressor */
+ jpeg_start_compress(&cinfo, TRUE);
+
+ /* Process data */
+ while (cinfo.next_scanline < cinfo.image_height) {
+ num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
+ (void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
+ }
+
+ /* Finish compression and release memory */
+ (*src_mgr->finish_input) (&cinfo, src_mgr);
+ jpeg_finish_compress(&cinfo);
+ jpeg_destroy_compress(&cinfo);
+
+ /* Close files, if we opened them */
+ if (input_file != stdin)
+ fclose(input_file);
+ if (output_file != stdout)
+ fclose(output_file);
+
+#ifdef PROGRESS_REPORT
+ end_progress_monitor((j_common_ptr) &cinfo);
+#endif
+
+ /* All done. */
+ exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
+ return 0; /* suppress no-return-value warnings */
+}
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