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  1. /*
  2.  * cjpeg.c
  3.  *
  4.  * Copyright (C) 1991-1998, Thomas G. Lane.
  5.  * This file is part of the Independent JPEG Group's software.
  6.  * For conditions of distribution and use, see the accompanying README file.
  7.  *
  8.  * This file contains a command-line user interface for the JPEG compressor.
  9.  * It should work on any system with Unix- or MS-DOS-style command lines.
  10.  *
  11.  * Two different command line styles are permitted, depending on the
  12.  * compile-time switch TWO_FILE_COMMANDLINE:
  13.  *      cjpeg [options]  inputfile outputfile
  14.  *      cjpeg [options]  [inputfile]
  15.  * In the second style, output is always to standard output, which you'd
  16.  * normally redirect to a file or pipe to some other program.  Input is
  17.  * either from a named file or from standard input (typically redirected).
  18.  * The second style is convenient on Unix but is unhelpful on systems that
  19.  * don't support pipes.  Also, you MUST use the first style if your system
  20.  * doesn't do binary I/O to stdin/stdout.
  21.  * To simplify script writing, the "-outfile" switch is provided.  The syntax
  22.  *      cjpeg [options]  -outfile outputfile  inputfile
  23.  * works regardless of which command line style is used.
  24.  */
  25.  
  26. #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
  27. #include "jversion.h"           /* for version message */
  28.  
  29. #ifdef USE_CCOMMAND             /* command-line reader for Macintosh */
  30. #ifdef __MWERKS__
  31. #include <SIOUX.h>              /* Metrowerks needs this */
  32. #include <console.h>            /* ... and this */
  33. #endif
  34. #ifdef THINK_C
  35. #include <console.h>            /* Think declares it here */
  36. #endif
  37. #endif
  38.  
  39.  
  40. /* Create the add-on message string table. */
  41.  
  42. #define JMESSAGE(code,string)   string ,
  43.  
  44. static const char * const cdjpeg_message_table[] = {
  45. #include "cderror.h"
  46.   NULL
  47. };
  48.  
  49.  
  50. /*
  51.  * This routine determines what format the input file is,
  52.  * and selects the appropriate input-reading module.
  53.  *
  54.  * To determine which family of input formats the file belongs to,
  55.  * we may look only at the first byte of the file, since C does not
  56.  * guarantee that more than one character can be pushed back with ungetc.
  57.  * Looking at additional bytes would require one of these approaches:
  58.  *     1) assume we can fseek() the input file (fails for piped input);
  59.  *     2) assume we can push back more than one character (works in
  60.  *        some C implementations, but unportable);
  61.  *     3) provide our own buffering (breaks input readers that want to use
  62.  *        stdio directly, such as the RLE library);
  63.  * or  4) don't put back the data, and modify the input_init methods to assume
  64.  *        they start reading after the start of file (also breaks RLE library).
  65.  * #1 is attractive for MS-DOS but is untenable on Unix.
  66.  *
  67.  * The most portable solution for file types that can't be identified by their
  68.  * first byte is to make the user tell us what they are.  This is also the
  69.  * only approach for "raw" file types that contain only arbitrary values.
  70.  * We presently apply this method for Targa files.  Most of the time Targa
  71.  * files start with 0x00, so we recognize that case.  Potentially, however,
  72.  * a Targa file could start with any byte value (byte 0 is the length of the
  73.  * seldom-used ID field), so we provide a switch to force Targa input mode.
  74.  */
  75.  
  76. static boolean is_targa;        /* records user -targa switch */
  77.  
  78.  
  79. LOCAL(cjpeg_source_ptr)
  80. select_file_type (j_compress_ptr cinfo, FILE * infile)
  81. {
  82.   int c;
  83.  
  84.   if (is_targa) {
  85. #ifdef TARGA_SUPPORTED
  86.     return jinit_read_targa(cinfo);
  87. #else
  88.     ERREXIT(cinfo, JERR_TGA_NOTCOMP);
  89. #endif
  90.   }
  91.  
  92.   if ((c = getc(infile)) == EOF)
  93.     ERREXIT(cinfo, JERR_INPUT_EMPTY);
  94.   if (ungetc(c, infile) == EOF)
  95.     ERREXIT(cinfo, JERR_UNGETC_FAILED);
  96.  
  97.   switch (c) {
  98. #ifdef BMP_SUPPORTED
  99.   case 'B':
  100.     return jinit_read_bmp(cinfo);
  101. #endif
  102. #ifdef GIF_SUPPORTED
  103.   case 'G':
  104.     return jinit_read_gif(cinfo);
  105. #endif
  106. #ifdef PPM_SUPPORTED
  107.   case 'P':
  108.     return jinit_read_ppm(cinfo);
  109. #endif
  110. #ifdef RLE_SUPPORTED
  111.   case 'R':
  112.     return jinit_read_rle(cinfo);
  113. #endif
  114. #ifdef TARGA_SUPPORTED
  115.   case 0x00:
  116.     return jinit_read_targa(cinfo);
  117. #endif
  118.   default:
  119.     ERREXIT(cinfo, JERR_UNKNOWN_FORMAT);
  120.     break;
  121.   }
  122.  
  123.   return NULL;                  /* suppress compiler warnings */
  124. }
  125.  
  126.  
  127. /*
  128.  * Argument-parsing code.
  129.  * The switch parser is designed to be useful with DOS-style command line
  130.  * syntax, ie, intermixed switches and file names, where only the switches
  131.  * to the left of a given file name affect processing of that file.
  132.  * The main program in this file doesn't actually use this capability...
  133.  */
  134.  
  135.  
  136. static const char * progname;   /* program name for error messages */
  137. static char * outfilename;      /* for -outfile switch */
  138.  
  139.  
  140. LOCAL(void)
  141. usage (void)
  142. /* complain about bad command line */
  143. {
  144.   fprintf(stderr, "usage: %s [switches] ", progname);
  145. #ifdef TWO_FILE_COMMANDLINE
  146.   fprintf(stderr, "inputfile outputfile\n");
  147. #else
  148.   fprintf(stderr, "[inputfile]\n");
  149. #endif
  150.  
  151.   fprintf(stderr, "Switches (names may be abbreviated):\n");
  152.   fprintf(stderr, "  -quality N     Compression quality (0..100; 5-95 is useful range)\n");
  153.   fprintf(stderr, "  -grayscale     Create monochrome JPEG file\n");
  154. #ifdef ENTROPY_OPT_SUPPORTED
  155.   fprintf(stderr, "  -optimize      Optimize Huffman table (smaller file, but slow compression)\n");
  156. #endif
  157. #ifdef C_PROGRESSIVE_SUPPORTED
  158.   fprintf(stderr, "  -progressive   Create progressive JPEG file\n");
  159. #endif
  160. #ifdef TARGA_SUPPORTED
  161.   fprintf(stderr, "  -targa         Input file is Targa format (usually not needed)\n");
  162. #endif
  163.   fprintf(stderr, "Switches for advanced users:\n");
  164. #ifdef DCT_ISLOW_SUPPORTED
  165.   fprintf(stderr, "  -dct int       Use integer DCT method%s\n",
  166.           (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
  167. #endif
  168. #ifdef DCT_IFAST_SUPPORTED
  169.   fprintf(stderr, "  -dct fast      Use fast integer DCT (less accurate)%s\n",
  170.           (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
  171. #endif
  172. #ifdef DCT_FLOAT_SUPPORTED
  173.   fprintf(stderr, "  -dct float     Use floating-point DCT method%s\n",
  174.           (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
  175. #endif
  176.   fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");
  177. #ifdef INPUT_SMOOTHING_SUPPORTED
  178.   fprintf(stderr, "  -smooth N      Smooth dithered input (N=1..100 is strength)\n");
  179. #endif
  180.   fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
  181.   fprintf(stderr, "  -outfile name  Specify name for output file\n");
  182.   fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
  183.   fprintf(stderr, "Switches for wizards:\n");
  184. #ifdef C_ARITH_CODING_SUPPORTED
  185.   fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");
  186. #endif
  187.   fprintf(stderr, "  -baseline      Force baseline quantization tables\n");
  188.   fprintf(stderr, "  -qtables file  Use quantization tables given in file\n");
  189.   fprintf(stderr, "  -qslots N[,...]    Set component quantization tables\n");
  190.   fprintf(stderr, "  -sample HxV[,...]  Set component sampling factors\n");
  191. #ifdef C_MULTISCAN_FILES_SUPPORTED
  192.   fprintf(stderr, "  -scans file    Create multi-scan JPEG per script file\n");
  193. #endif
  194.   exit(EXIT_FAILURE);
  195. }
  196.  
  197.  
  198. LOCAL(int)
  199. parse_switches (j_compress_ptr cinfo, int argc, char **argv,
  200.                 int last_file_arg_seen, boolean for_real)
  201. /* Parse optional switches.
  202.  * Returns argv[] index of first file-name argument (== argc if none).
  203.  * Any file names with indexes <= last_file_arg_seen are ignored;
  204.  * they have presumably been processed in a previous iteration.
  205.  * (Pass 0 for last_file_arg_seen on the first or only iteration.)
  206.  * for_real is FALSE on the first (dummy) pass; we may skip any expensive
  207.  * processing.
  208.  */
  209. {
  210.   int argn;
  211.   char * arg;
  212.   int quality;                  /* -quality parameter */
  213.   int q_scale_factor;           /* scaling percentage for -qtables */
  214.   boolean force_baseline;
  215.   boolean simple_progressive;
  216.   char * qtablefile = NULL;     /* saves -qtables filename if any */
  217.   char * qslotsarg = NULL;      /* saves -qslots parm if any */
  218.   char * samplearg = NULL;      /* saves -sample parm if any */
  219.   char * scansarg = NULL;       /* saves -scans parm if any */
  220.  
  221.   /* Set up default JPEG parameters. */
  222.   /* Note that default -quality level need not, and does not,
  223.    * match the default scaling for an explicit -qtables argument.
  224.    */
  225.   quality = 75;                 /* default -quality value */
  226.   q_scale_factor = 100;         /* default to no scaling for -qtables */
  227.   force_baseline = FALSE;       /* by default, allow 16-bit quantizers */
  228.   simple_progressive = FALSE;
  229.   is_targa = FALSE;
  230.   outfilename = NULL;
  231.   cinfo->err->trace_level = 0;
  232.  
  233.   /* Scan command line options, adjust parameters */
  234.  
  235.   for (argn = 1; argn < argc; argn++) {
  236.     arg = argv[argn];
  237.     if (*arg != '-') {
  238.       /* Not a switch, must be a file name argument */
  239.       if (argn <= last_file_arg_seen) {
  240.         outfilename = NULL;     /* -outfile applies to just one input file */
  241.         continue;               /* ignore this name if previously processed */
  242.       }
  243.       break;                    /* else done parsing switches */
  244.     }
  245.     arg++;                      /* advance past switch marker character */
  246.  
  247.     if (keymatch(arg, "arithmetic", 1)) {
  248.       /* Use arithmetic coding. */
  249. #ifdef C_ARITH_CODING_SUPPORTED
  250.       cinfo->arith_code = TRUE;
  251. #else
  252.       fprintf(stderr, "%s: sorry, arithmetic coding not supported\n",
  253.               progname);
  254.       exit(EXIT_FAILURE);
  255. #endif
  256.  
  257.     } else if (keymatch(arg, "baseline", 1)) {
  258.       /* Force baseline-compatible output (8-bit quantizer values). */
  259.       force_baseline = TRUE;
  260.  
  261.     } else if (keymatch(arg, "dct", 2)) {
  262.       /* Select DCT algorithm. */
  263.       if (++argn >= argc)       /* advance to next argument */
  264.         usage();
  265.       if (keymatch(argv[argn], "int", 1)) {
  266.         cinfo->dct_method = JDCT_ISLOW;
  267.       } else if (keymatch(argv[argn], "fast", 2)) {
  268.         cinfo->dct_method = JDCT_IFAST;
  269.       } else if (keymatch(argv[argn], "float", 2)) {
  270.         cinfo->dct_method = JDCT_FLOAT;
  271.       } else
  272.         usage();
  273.  
  274.     } else if (keymatch(arg, "debug", 1) || keymatch(arg, "verbose", 1)) {
  275.       /* Enable debug printouts. */
  276.       /* On first -d, print version identification */
  277.       static boolean printed_version = FALSE;
  278.  
  279.       if (! printed_version) {
  280.         fprintf(stderr, "Independent JPEG Group's CJPEG, version %s\n%s\n",
  281.                 JVERSION, JCOPYRIGHT);
  282.         printed_version = TRUE;
  283.       }
  284.       cinfo->err->trace_level++;
  285.  
  286.     } else if (keymatch(arg, "grayscale", 2) || keymatch(arg, "greyscale",2)) {
  287.       /* Force a monochrome JPEG file to be generated. */
  288.       jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
  289.  
  290.     } else if (keymatch(arg, "maxmemory", 3)) {
  291.       /* Maximum memory in Kb (or Mb with 'm'). */
  292.       long lval;
  293.       char ch = 'x';
  294.  
  295.       if (++argn >= argc)       /* advance to next argument */
  296.         usage();
  297.       if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
  298.         usage();
  299.       if (ch == 'm' || ch == 'M')
  300.         lval *= 1000L;
  301.       cinfo->mem->max_memory_to_use = lval * 1000L;
  302.  
  303.     } else if (keymatch(arg, "optimize", 1) || keymatch(arg, "optimise", 1)) {
  304.       /* Enable entropy parm optimization. */
  305. #ifdef ENTROPY_OPT_SUPPORTED
  306.       cinfo->optimize_coding = TRUE;
  307. #else
  308.       fprintf(stderr, "%s: sorry, entropy optimization was not compiled\n",
  309.               progname);
  310.       exit(EXIT_FAILURE);
  311. #endif
  312.  
  313.     } else if (keymatch(arg, "outfile", 4)) {
  314.       /* Set output file name. */
  315.       if (++argn >= argc)       /* advance to next argument */
  316.         usage();
  317.       outfilename = argv[argn]; /* save it away for later use */
  318.  
  319.     } else if (keymatch(arg, "progressive", 1)) {
  320.       /* Select simple progressive mode. */
  321. #ifdef C_PROGRESSIVE_SUPPORTED
  322.       simple_progressive = TRUE;
  323.       /* We must postpone execution until num_components is known. */
  324. #else
  325.       fprintf(stderr, "%s: sorry, progressive output was not compiled\n",
  326.               progname);
  327.       exit(EXIT_FAILURE);
  328. #endif
  329.  
  330.     } else if (keymatch(arg, "quality", 1)) {
  331.       /* Quality factor (quantization table scaling factor). */
  332.       if (++argn >= argc)       /* advance to next argument */
  333.         usage();
  334.       if (sscanf(argv[argn], "%d", &quality) != 1)
  335.         usage();
  336.       /* Change scale factor in case -qtables is present. */
  337.       q_scale_factor = jpeg_quality_scaling(quality);
  338.  
  339.     } else if (keymatch(arg, "qslots", 2)) {
  340.       /* Quantization table slot numbers. */
  341.       if (++argn >= argc)       /* advance to next argument */
  342.         usage();
  343.       qslotsarg = argv[argn];
  344.       /* Must delay setting qslots until after we have processed any
  345.        * colorspace-determining switches, since jpeg_set_colorspace sets
  346.        * default quant table numbers.
  347.        */
  348.  
  349.     } else if (keymatch(arg, "qtables", 2)) {
  350.       /* Quantization tables fetched from file. */
  351.       if (++argn >= argc)       /* advance to next argument */
  352.         usage();
  353.       qtablefile = argv[argn];
  354.       /* We postpone actually reading the file in case -quality comes later. */
  355.  
  356.     } else if (keymatch(arg, "restart", 1)) {
  357.       /* Restart interval in MCU rows (or in MCUs with 'b'). */
  358.       long lval;
  359.       char ch = 'x';
  360.  
  361.       if (++argn >= argc)       /* advance to next argument */
  362.         usage();
  363.       if (sscanf(argv[argn], "%ld%c", &lval, &ch) < 1)
  364.         usage();
  365.       if (lval < 0 || lval > 65535L)
  366.         usage();
  367.       if (ch == 'b' || ch == 'B') {
  368.         cinfo->restart_interval = (unsigned int) lval;
  369.         cinfo->restart_in_rows = 0; /* else prior '-restart n' overrides me */
  370.       } else {
  371.         cinfo->restart_in_rows = (int) lval;
  372.         /* restart_interval will be computed during startup */
  373.       }
  374.  
  375.     } else if (keymatch(arg, "sample", 2)) {
  376.       /* Set sampling factors. */
  377.       if (++argn >= argc)       /* advance to next argument */
  378.         usage();
  379.       samplearg = argv[argn];
  380.       /* Must delay setting sample factors until after we have processed any
  381.        * colorspace-determining switches, since jpeg_set_colorspace sets
  382.        * default sampling factors.
  383.        */
  384.  
  385.     } else if (keymatch(arg, "scans", 2)) {
  386.       /* Set scan script. */
  387. #ifdef C_MULTISCAN_FILES_SUPPORTED
  388.       if (++argn >= argc)       /* advance to next argument */
  389.         usage();
  390.       scansarg = argv[argn];
  391.       /* We must postpone reading the file in case -progressive appears. */
  392. #else
  393.       fprintf(stderr, "%s: sorry, multi-scan output was not compiled\n",
  394.               progname);
  395.       exit(EXIT_FAILURE);
  396. #endif
  397.  
  398.     } else if (keymatch(arg, "smooth", 2)) {
  399.       /* Set input smoothing factor. */
  400.       int val;
  401.  
  402.       if (++argn >= argc)       /* advance to next argument */
  403.         usage();
  404.       if (sscanf(argv[argn], "%d", &val) != 1)
  405.         usage();
  406.       if (val < 0 || val > 100)
  407.         usage();
  408.       cinfo->smoothing_factor = val;
  409.  
  410.     } else if (keymatch(arg, "targa", 1)) {
  411.       /* Input file is Targa format. */
  412.       is_targa = TRUE;
  413.  
  414.     } else {
  415.       usage();                  /* bogus switch */
  416.     }
  417.   }
  418.  
  419.   /* Post-switch-scanning cleanup */
  420.  
  421.   if (for_real) {
  422.  
  423.     /* Set quantization tables for selected quality. */
  424.     /* Some or all may be overridden if -qtables is present. */
  425.     jpeg_set_quality(cinfo, quality, force_baseline);
  426.  
  427.     if (qtablefile != NULL)     /* process -qtables if it was present */
  428.       if (! read_quant_tables(cinfo, qtablefile,
  429.                               q_scale_factor, force_baseline))
  430.         usage();
  431.  
  432.     if (qslotsarg != NULL)      /* process -qslots if it was present */
  433.       if (! set_quant_slots(cinfo, qslotsarg))
  434.         usage();
  435.  
  436.     if (samplearg != NULL)      /* process -sample if it was present */
  437.       if (! set_sample_factors(cinfo, samplearg))
  438.         usage();
  439.  
  440. #ifdef C_PROGRESSIVE_SUPPORTED
  441.     if (simple_progressive)     /* process -progressive; -scans can override */
  442.       jpeg_simple_progression(cinfo);
  443. #endif
  444.  
  445. #ifdef C_MULTISCAN_FILES_SUPPORTED
  446.     if (scansarg != NULL)       /* process -scans if it was present */
  447.       if (! read_scan_script(cinfo, scansarg))
  448.         usage();
  449. #endif
  450.   }
  451.  
  452.   return argn;                  /* return index of next arg (file name) */
  453. }
  454.  
  455.  
  456. /*
  457.  * The main program.
  458.  */
  459.  
  460. int
  461. main (int argc, char **argv)
  462. {
  463.   struct jpeg_compress_struct cinfo;
  464.   struct jpeg_error_mgr jerr;
  465. #ifdef PROGRESS_REPORT
  466.   struct cdjpeg_progress_mgr progress;
  467. #endif
  468.   int file_index;
  469.   cjpeg_source_ptr src_mgr;
  470.   FILE * input_file;
  471.   FILE * output_file;
  472.   JDIMENSION num_scanlines;
  473.  
  474.   /* On Mac, fetch a command line. */
  475. #ifdef USE_CCOMMAND
  476.   argc = ccommand(&argv);
  477. #endif
  478.  
  479.   progname = argv[0];
  480.   if (progname == NULL || progname[0] == 0)
  481.     progname = "cjpeg";         /* in case C library doesn't provide it */
  482.  
  483.   /* Initialize the JPEG compression object with default error handling. */
  484.   cinfo.err = jpeg_std_error(&jerr);
  485.   jpeg_create_compress(&cinfo);
  486.   /* Add some application-specific error messages (from cderror.h) */
  487.   jerr.addon_message_table = cdjpeg_message_table;
  488.   jerr.first_addon_message = JMSG_FIRSTADDONCODE;
  489.   jerr.last_addon_message = JMSG_LASTADDONCODE;
  490.  
  491.   /* Now safe to enable signal catcher. */
  492. #ifdef NEED_SIGNAL_CATCHER
  493.   enable_signal_catcher((j_common_ptr) &cinfo);
  494. #endif
  495.  
  496.   /* Initialize JPEG parameters.
  497.    * Much of this may be overridden later.
  498.    * In particular, we don't yet know the input file's color space,
  499.    * but we need to provide some value for jpeg_set_defaults() to work.
  500.    */
  501.  
  502.   cinfo.in_color_space = JCS_RGB; /* arbitrary guess */
  503.   jpeg_set_defaults(&cinfo);
  504.  
  505.   /* Scan command line to find file names.
  506.    * It is convenient to use just one switch-parsing routine, but the switch
  507.    * values read here are ignored; we will rescan the switches after opening
  508.    * the input file.
  509.    */
  510.  
  511.   file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
  512.  
  513. #ifdef TWO_FILE_COMMANDLINE
  514.   /* Must have either -outfile switch or explicit output file name */
  515.   if (outfilename == NULL) {
  516.     if (file_index != argc-2) {
  517.       fprintf(stderr, "%s: must name one input and one output file\n",
  518.               progname);
  519.       usage();
  520.     }
  521.     outfilename = argv[file_index+1];
  522.   } else {
  523.     if (file_index != argc-1) {
  524.       fprintf(stderr, "%s: must name one input and one output file\n",
  525.               progname);
  526.       usage();
  527.     }
  528.   }
  529. #else
  530.   /* Unix style: expect zero or one file name */
  531.   if (file_index < argc-1) {
  532.     fprintf(stderr, "%s: only one input file\n", progname);
  533.     usage();
  534.   }
  535. #endif /* TWO_FILE_COMMANDLINE */
  536.  
  537.   /* Open the input file. */
  538.   if (file_index < argc) {
  539.     if ((input_file = fopen(argv[file_index], READ_BINARY)) == NULL) {
  540.       fprintf(stderr, "%s: can't open %s\n", progname, argv[file_index]);
  541.       exit(EXIT_FAILURE);
  542.     }
  543.   } else {
  544.     /* default input file is stdin */
  545.     input_file = read_stdin();
  546.   }
  547.  
  548.   /* Open the output file. */
  549.   if (outfilename != NULL) {
  550.     if ((output_file = fopen(outfilename, WRITE_BINARY)) == NULL) {
  551.       fprintf(stderr, "%s: can't open %s\n", progname, outfilename);
  552.       exit(EXIT_FAILURE);
  553.     }
  554.   } else {
  555.     /* default output file is stdout */
  556.     output_file = write_stdout();
  557.   }
  558.  
  559. #ifdef PROGRESS_REPORT
  560.   start_progress_monitor((j_common_ptr) &cinfo, &progress);
  561. #endif
  562.  
  563.   /* Figure out the input file format, and set up to read it. */
  564.   src_mgr = select_file_type(&cinfo, input_file);
  565.   src_mgr->input_file = input_file;
  566.  
  567.   /* Read the input file header to obtain file size & colorspace. */
  568.   (*src_mgr->start_input) (&cinfo, src_mgr);
  569.  
  570.   /* Now that we know input colorspace, fix colorspace-dependent defaults */
  571.   jpeg_default_colorspace(&cinfo);
  572.  
  573.   /* Adjust default compression parameters by re-parsing the options */
  574.   file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
  575.  
  576.   /* Specify data destination for compression */
  577.   jpeg_stdio_dest(&cinfo, output_file);
  578.  
  579.   /* Start compressor */
  580.   jpeg_start_compress(&cinfo, TRUE);
  581.  
  582.   /* Process data */
  583.   while (cinfo.next_scanline < cinfo.image_height) {
  584.     num_scanlines = (*src_mgr->get_pixel_rows) (&cinfo, src_mgr);
  585.     (void) jpeg_write_scanlines(&cinfo, src_mgr->buffer, num_scanlines);
  586.   }
  587.  
  588.   /* Finish compression and release memory */
  589.   (*src_mgr->finish_input) (&cinfo, src_mgr);
  590.   jpeg_finish_compress(&cinfo);
  591.   jpeg_destroy_compress(&cinfo);
  592.  
  593.   /* Close files, if we opened them */
  594.   if (input_file != stdin)
  595.     fclose(input_file);
  596.   if (output_file != stdout)
  597.     fclose(output_file);
  598.  
  599. #ifdef PROGRESS_REPORT
  600.   end_progress_monitor((j_common_ptr) &cinfo);
  601. #endif
  602.  
  603.   /* All done. */
  604.   exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
  605.   return 0;                     /* suppress no-return-value warnings */
  606. }
  607.