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/*

 * cjpeg.c

 *

 * Copyright (C) 1991-1998, 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 "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");

#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 TARGA_SUPPORTED

  fprintf(stderr, "  -targa         Input file is Targa format (usually not needed)\n");

#endif

  fprintf(stderr, "Switches for advanced users:\n");

#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, "  -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");

#ifdef C_ARITH_CODING_SUPPORTED

  fprintf(stderr, "  -arithmetic    Use arithmetic coding\n");

#endif

  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;

  int quality;                  /* -quality parameter */

  int q_scale_factor;           /* scaling percentage for -qtables */

  boolean force_baseline;

  boolean simple_progressive;

  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. */

  /* Note that default -quality level need not, and does not,

   * match the default scaling for an explicit -qtables argument.

   */

  quality = 75;                 /* default -quality value */

  q_scale_factor = 100;         /* default to no scaling for -qtables */

  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", 1)) {

      /* Force baseline-compatible output (8-bit quantizer values). */

      force_baseline = TRUE;

    } 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, "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, "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 factor (quantization table scaling factor). */

      if (++argn >= argc)       /* advance to next argument */

        usage();

      if (sscanf(argv[argn], "%d", &quality) != 1)

        usage();

      /* Change scale factor in case -qtables is present. */

      q_scale_factor = jpeg_quality_scaling(quality);

    } 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, "scans", 2)) {

      /* 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. */

    jpeg_set_quality(cinfo, quality, force_baseline);

    if (qtablefile != NULL)     /* process -qtables if it was present */

      if (! read_quant_tables(cinfo, qtablefile,

                              q_scale_factor, 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 */

}