/*

 * jpegtran.c

 *

 * This file was part of the Independent JPEG Group's software:

 * Copyright (C) 1995-2010, Thomas G. Lane, Guido Vollbeding.

 * libjpeg-turbo Modifications:

 * Copyright (C) 2010, 2014, 2017, 2020, D. R. Commander.

 * For conditions of distribution and use, see the accompanying README.ijg

 * file.

 *

 * This file contains a command-line user interface for JPEG transcoding.

 * It is very similar to cjpeg.c, and partly to djpeg.c, but provides

 * lossless transcoding between different JPEG file formats.  It also

 * provides some lossless and sort-of-lossless transformations of JPEG data.

 */

#include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */

#include "transupp.h"           /* Support routines for jpegtran */

#include "jversion.h"           /* for version message */

#include "jconfigint.h"

#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

/*

 * 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 */

static JCOPY_OPTION copyoption; /* -copy switch */

static jpeg_transform_info transformoption; /* image transformation options */

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, "  -copy none     Copy no extra markers from source file\n");

  fprintf(stderr, "  -copy comments Copy only comment markers (default)\n");

  fprintf(stderr, "  -copy all      Copy all extra markers\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

  fprintf(stderr, "Switches for modifying the image:\n");

#if TRANSFORMS_SUPPORTED

  fprintf(stderr, "  -crop WxH+X+Y  Crop to a rectangular region\n");

  fprintf(stderr, "  -grayscale     Reduce to grayscale (omit color data)\n");

  fprintf(stderr, "  -flip [horizontal|vertical]  Mirror image (left-right or top-bottom)\n");

  fprintf(stderr, "  -perfect       Fail if there is non-transformable edge blocks\n");

  fprintf(stderr, "  -rotate [90|180|270]         Rotate image (degrees clockwise)\n");

#endif

#if TRANSFORMS_SUPPORTED

  fprintf(stderr, "  -transpose     Transpose image\n");

  fprintf(stderr, "  -transverse    Transverse transpose image\n");

  fprintf(stderr, "  -trim          Drop non-transformable edge blocks\n");

#endif

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

#ifdef C_ARITH_CODING_SUPPORTED

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

#endif

  fprintf(stderr, "  -icc FILE      Embed ICC profile contained in FILE\n");

  fprintf(stderr, "  -restart N     Set restart interval in rows, or in blocks with B\n");

  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, "  -version       Print version information and exit\n");

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

#ifdef C_MULTISCAN_FILES_SUPPORTED

  fprintf(stderr, "  -scans FILE    Create multi-scan JPEG per script FILE\n");

#endif

  exit(EXIT_FAILURE);

}

LOCAL(void)

select_transform(JXFORM_CODE transform)

/* Silly little routine to detect multiple transform options,

 * which we can't handle.

 */

{

#if TRANSFORMS_SUPPORTED

  if (transformoption.transform == JXFORM_NONE ||

      transformoption.transform == transform) {

    transformoption.transform = transform;

  } else {

    fprintf(stderr, "%s: can only do one image transformation at a time\n",

            progname);

    usage();

  }

#else

  fprintf(stderr, "%s: sorry, image transformation was not compiled\n",

          progname);

  exit(EXIT_FAILURE);

#endif

}

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 simple_progressive;

  char *scansarg = NULL;        /* saves -scans parm if any */

  /* Set up default JPEG parameters. */

  simple_progressive = FALSE;

  icc_filename = NULL;

  outfilename = NULL;

  copyoption = JCOPYOPT_DEFAULT;

  transformoption.transform = JXFORM_NONE;

  transformoption.perfect = FALSE;

  transformoption.trim = FALSE;

  transformoption.force_grayscale = FALSE;

  transformoption.crop = FALSE;

  transformoption.slow_hflip = FALSE;

  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, "copy", 2)) {

      /* Select which extra markers to copy. */

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

        usage();

      if (keymatch(argv[argn], "none", 1)) {

        copyoption = JCOPYOPT_NONE;

      } else if (keymatch(argv[argn], "comments", 1)) {

        copyoption = JCOPYOPT_COMMENTS;

      } else if (keymatch(argv[argn], "all", 1)) {

        copyoption = JCOPYOPT_ALL;

      } else

        usage();

    } else if (keymatch(arg, "crop", 2)) {

      /* Perform lossless cropping. */

#if TRANSFORMS_SUPPORTED

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

        usage();

      if (!jtransform_parse_crop_spec(&transformoption, argv[argn])) {

        fprintf(stderr, "%s: bogus -crop argument '%s'\n",

                progname, argv[argn]);

        exit(EXIT_FAILURE);

      }

#else

      select_transform(JXFORM_NONE);    /* force an error */

#endif

    } 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, "%s version %s (build %s)\n",

                PACKAGE_NAME, VERSION, BUILD);

        fprintf(stderr, "%s\n\n", JCOPYRIGHT);

        fprintf(stderr, "Emulating The Independent JPEG Group's software, version %s\n\n",

                JVERSION);

        printed_version = TRUE;

      }

      cinfo->err->trace_level++;

    } else if (keymatch(arg, "version", 4)) {

      fprintf(stderr, "%s version %s (build %s)\n",

              PACKAGE_NAME, VERSION, BUILD);

      exit(EXIT_SUCCESS);

    } else if (keymatch(arg, "flip", 1)) {

      /* Mirror left-right or top-bottom. */

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

        usage();

      if (keymatch(argv[argn], "horizontal", 1))

        select_transform(JXFORM_FLIP_H);

      else if (keymatch(argv[argn], "vertical", 1))

        select_transform(JXFORM_FLIP_V);

      else

        usage();

    } else if (keymatch(arg, "grayscale", 1) ||

               keymatch(arg, "greyscale", 1)) {

      /* Force to grayscale. */

#if TRANSFORMS_SUPPORTED

      transformoption.force_grayscale = TRUE;

#else

      select_transform(JXFORM_NONE);    /* force an error */

#endif

    } else if (keymatch(arg, "icc", 1)) {

      /* Set ICC filename. */

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

        usage();

      icc_filename = argv[argn];

    } 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, "perfect", 2)) {

      /* Fail if there is any partial edge MCUs that the transform can't

       * handle. */

      transformoption.perfect = TRUE;

    } else if (keymatch(arg, "progressive", 2)) {

      /* 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, "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, "rotate", 2)) {

      /* Rotate 90, 180, or 270 degrees (measured clockwise). */

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

        usage();

      if (keymatch(argv[argn], "90", 2))

        select_transform(JXFORM_ROT_90);

      else if (keymatch(argv[argn], "180", 3))

        select_transform(JXFORM_ROT_180);

      else if (keymatch(argv[argn], "270", 3))

        select_transform(JXFORM_ROT_270);

      else

        usage();

    } else if (keymatch(arg, "scans", 1)) {

      /* 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, "transpose", 1)) {

      /* Transpose (across UL-to-LR axis). */

      select_transform(JXFORM_TRANSPOSE);

    } else if (keymatch(arg, "transverse", 6)) {

      /* Transverse transpose (across UR-to-LL axis). */

      select_transform(JXFORM_TRANSVERSE);

    } else if (keymatch(arg, "trim", 3)) {

      /* Trim off any partial edge MCUs that the transform can't handle. */

      transformoption.trim = TRUE;

    } else {

      usage();                  /* bogus switch */

    }

  }

  /* Post-switch-scanning cleanup */

  if (for_real) {

#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_decompress_struct srcinfo;

  struct jpeg_compress_struct dstinfo;

  struct jpeg_error_mgr jsrcerr, jdsterr;

#ifdef PROGRESS_REPORT

  struct cdjpeg_progress_mgr progress;

#endif

  jvirt_barray_ptr *src_coef_arrays;

  jvirt_barray_ptr *dst_coef_arrays;

  int file_index;

  /* We assume all-in-memory processing and can therefore use only a

   * single file pointer for sequential input and output operation.

   */

  FILE *fp;

  FILE *icc_file;

  JOCTET *icc_profile = NULL;

  long icc_len = 0;

  /* On Mac, fetch a command line. */

#ifdef USE_CCOMMAND

  argc = ccommand(&argv);

#endif

  progname = argv[0];

  if (progname == NULL || progname[0] == 0)

    progname = "jpegtran";      /* in case C library doesn't provide it */

  /* Initialize the JPEG decompression object with default error handling. */

  srcinfo.err = jpeg_std_error(&jsrcerr);

  jpeg_create_decompress(&srcinfo);

  /* Initialize the JPEG compression object with default error handling. */

  dstinfo.err = jpeg_std_error(&jdsterr);

  jpeg_create_compress(&dstinfo);

  /* Scan command line to find file names.

   * It is convenient to use just one switch-parsing routine, but the switch

   * values read here are mostly ignored; we will rescan the switches after

   * opening the input file.  Also note that most of the switches affect the

   * destination JPEG object, so we parse into that and then copy over what

   * needs to affects the source too.

   */

  file_index = parse_switches(&dstinfo, argc, argv, 0, FALSE);

  jsrcerr.trace_level = jdsterr.trace_level;

  srcinfo.mem->max_memory_to_use = dstinfo.mem->max_memory_to_use;

#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 ((fp = fopen(argv[file_index], READ_BINARY)) == NULL) {

      fprintf(stderr, "%s: can't open %s for reading\n", progname,

              argv[file_index]);

      exit(EXIT_FAILURE);

    }

  } else {

    /* default input file is stdin */

    fp = read_stdin();

  }

  if (icc_filename != NULL) {

    if ((icc_file = fopen(icc_filename, READ_BINARY)) == NULL) {

      fprintf(stderr, "%s: can't open %s\n", progname, icc_filename);

      exit(EXIT_FAILURE);

    }

    if (fseek(icc_file, 0, SEEK_END) < 0 ||

        (icc_len = ftell(icc_file)) < 1 ||

        fseek(icc_file, 0, SEEK_SET) < 0) {

      fprintf(stderr, "%s: can't determine size of %s\n", progname,

              icc_filename);

      exit(EXIT_FAILURE);

    }

    if ((icc_profile = (JOCTET *)malloc(icc_len)) == NULL) {

      fprintf(stderr, "%s: can't allocate memory for ICC profile\n", progname);

      fclose(icc_file);

      exit(EXIT_FAILURE);

    }

    if (fread(icc_profile, icc_len, 1, icc_file) < 1) {

      fprintf(stderr, "%s: can't read ICC profile from %s\n", progname,

              icc_filename);

      free(icc_profile);

      fclose(icc_file);

      exit(EXIT_FAILURE);

    }

    fclose(icc_file);

    if (copyoption == JCOPYOPT_ALL)

      copyoption = JCOPYOPT_ALL_EXCEPT_ICC;

  }

#ifdef PROGRESS_REPORT

  start_progress_monitor((j_common_ptr)&dstinfo, &progress);

#endif

  /* Specify data source for decompression */

  jpeg_stdio_src(&srcinfo, fp);

  /* Enable saving of extra markers that we want to copy */

  jcopy_markers_setup(&srcinfo, copyoption);

  /* Read file header */

  (void)jpeg_read_header(&srcinfo, TRUE);

  /* Any space needed by a transform option must be requested before

   * jpeg_read_coefficients so that memory allocation will be done right.

   */

#if TRANSFORMS_SUPPORTED

  /* Fail right away if -perfect is given and transformation is not perfect.

   */

  if (!jtransform_request_workspace(&srcinfo, &transformoption)) {

    fprintf(stderr, "%s: transformation is not perfect\n", progname);

    exit(EXIT_FAILURE);

  }

#endif

  /* Read source file as DCT coefficients */

  src_coef_arrays = jpeg_read_coefficients(&srcinfo);

  /* Initialize destination compression parameters from source values */

  jpeg_copy_critical_parameters(&srcinfo, &dstinfo);

  /* Adjust destination parameters if required by transform options;

   * also find out which set of coefficient arrays will hold the output.

   */

#if TRANSFORMS_SUPPORTED

  dst_coef_arrays = jtransform_adjust_parameters(&srcinfo, &dstinfo,

                                                 src_coef_arrays,

                                                 &transformoption);

#else

  dst_coef_arrays = src_coef_arrays;

#endif

  /* Close input file, if we opened it.

   * Note: we assume that jpeg_read_coefficients consumed all input

   * until JPEG_REACHED_EOI, and that jpeg_finish_decompress will

   * only consume more while (!cinfo->inputctl->eoi_reached).

   * We cannot call jpeg_finish_decompress here since we still need the

   * virtual arrays allocated from the source object for processing.

   */

  if (fp != stdin)

    fclose(fp);

  /* Open the output file. */

  if (outfilename != NULL) {

    if ((fp = fopen(outfilename, WRITE_BINARY)) == NULL) {

      fprintf(stderr, "%s: can't open %s for writing\n", progname,

              outfilename);

      exit(EXIT_FAILURE);

    }

  } else {

    /* default output file is stdout */

    fp = write_stdout();

  }

  /* Adjust default compression parameters by re-parsing the options */

  file_index = parse_switches(&dstinfo, argc, argv, 0, TRUE);

  /* Specify data destination for compression */

  jpeg_stdio_dest(&dstinfo, fp);

  /* Start compressor (note no image data is actually written here) */

  jpeg_write_coefficients(&dstinfo, dst_coef_arrays);

  /* Copy to the output file any extra markers that we want to preserve */

  jcopy_markers_execute(&srcinfo, &dstinfo, copyoption);

  if (icc_profile != NULL)

    jpeg_write_icc_profile(&dstinfo, icc_profile, (unsigned int)icc_len);

  /* Execute image transformation, if any */

#if TRANSFORMS_SUPPORTED

  jtransform_execute_transformation(&srcinfo, &dstinfo, src_coef_arrays,

                                    &transformoption);

#endif

  /* Finish compression and release memory */

  jpeg_finish_compress(&dstinfo);

  jpeg_destroy_compress(&dstinfo);

  (void)jpeg_finish_decompress(&srcinfo);

  jpeg_destroy_decompress(&srcinfo);

  /* Close output file, if we opened it */

  if (fp != stdout)

    fclose(fp);

#ifdef PROGRESS_REPORT

  end_progress_monitor((j_common_ptr)&dstinfo);

#endif

  free(icc_profile);

  /* All done. */

  exit(jsrcerr.num_warnings + jdsterr.num_warnings ?

       EXIT_WARNING : EXIT_SUCCESS);

  return 0;                     /* suppress no-return-value warnings */

}