kc3-lang/libjpeg-turbo/src/djpeg.c

Branch - branch -main

• Show log

  Commit

• Hash : 6a9565ce
  Author :
  Date : 2024-08-26T16:45:41
  

  Merge branch 'main' into dev
  

Download

• src/djpeg.c

• /*
   * djpeg.c
   *
   * This file was part of the Independent JPEG Group's software:
   * Copyright (C) 1991-1997, Thomas G. Lane.
   * Modified 2013-2019 by Guido Vollbeding.
   * libjpeg-turbo Modifications:
   * Copyright (C) 2010-2011, 2013-2017, 2019-2020, 2022-2024, D. R. Commander.
   * Copyright (C) 2015, Google, Inc.
   * For conditions of distribution and use, see the accompanying README.ijg
   * file.
   *
   * This file contains a command-line user interface for the JPEG decompressor.
   * 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:
   *      djpeg [options]  inputfile outputfile
   *      djpeg [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
   *      djpeg [options]  -outfile outputfile  inputfile
   * works regardless of which command line style is used.
   */
  
  #ifdef _MSC_VER
  #define _CRT_SECURE_NO_DEPRECATE
  #endif
  
  #include "cdjpeg.h"             /* Common decls for cjpeg/djpeg applications */
  #include "jversion.h"           /* for version message */
  #include "jconfigint.h"
  
  #include <ctype.h>              /* to declare isprint() */
  
  
  /* Create the add-on message string table. */
  
  #define JMESSAGE(code, string)  string,
  
  static const char * const cdjpeg_message_table[] = {
  #include "cderror.h"
    NULL
  };
  
  
  /*
   * This list defines the known output image formats
   * (not all of which need be supported by a given version).
   * You can change the default output format by defining DEFAULT_FMT;
   * indeed, you had better do so if you undefine PPM_SUPPORTED.
   */
  
  typedef enum {
    FMT_BMP,                      /* BMP format (Windows flavor) */
    FMT_GIF,                      /* GIF format (LZW-compressed) */
    FMT_GIF0,                     /* GIF format (uncompressed) */
    FMT_OS2,                      /* BMP format (OS/2 flavor) */
    FMT_PPM,                      /* PPM/PGM (PBMPLUS formats) */
    FMT_TARGA,                    /* Targa format */
    FMT_TIFF                      /* TIFF format */
  } IMAGE_FORMATS;
  
  #ifndef DEFAULT_FMT             /* so can override from CFLAGS in Makefile */
  #define DEFAULT_FMT     FMT_PPM
  #endif
  
  static IMAGE_FORMATS requested_fmt;
  
  
  /*
   * 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 JDIMENSION max_scans;    /* for -maxscans switch */
  static char *outfilename;       /* for -outfile switch */
  static boolean memsrc;          /* for -memsrc switch */
  static boolean report;          /* for -report switch */
  static boolean skip, crop;
  static JDIMENSION skip_start, skip_end;
  static JDIMENSION crop_x, crop_y, crop_width, crop_height;
  static boolean strict;          /* for -strict switch */
  #define INPUT_BUF_SIZE  4096
  
  
  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, "  -colors N      Reduce image to no more than N colors [legacy feature]\n");
    fprintf(stderr, "  -fast          Low-quality processing [legacy feature]\n");
    fprintf(stderr, "  -grayscale     Force grayscale output\n");
    fprintf(stderr, "  -rgb           Force RGB output\n");
    fprintf(stderr, "  -rgb565        Force RGB565 output\n");
  #ifdef IDCT_SCALING_SUPPORTED
    fprintf(stderr, "  -scale M/N     Scale output image by fraction M/N, eg, 1/8\n");
  #endif
  #ifdef BMP_SUPPORTED
    fprintf(stderr, "  -bmp           Select BMP output format (Windows style)%s\n",
            (DEFAULT_FMT == FMT_BMP ? " (default)" : ""));
  #endif
  #ifdef GIF_SUPPORTED
    fprintf(stderr, "  -gif           Select GIF output format (LZW-compressed)%s [legacy feature]\n",
            (DEFAULT_FMT == FMT_GIF ? " (default)" : ""));
    fprintf(stderr, "  -gif0          Select GIF output format (uncompressed)%s [legacy feature]\n",
            (DEFAULT_FMT == FMT_GIF0 ? " (default)" : ""));
  #endif
  #ifdef BMP_SUPPORTED
    fprintf(stderr, "  -os2           Select BMP output format (OS/2 style)%s [legacy feature]\n",
            (DEFAULT_FMT == FMT_OS2 ? " (default)" : ""));
  #endif
  #ifdef PPM_SUPPORTED
    fprintf(stderr, "  -pnm           Select PBMPLUS (PPM/PGM) output format%s\n",
            (DEFAULT_FMT == FMT_PPM ? " (default)" : ""));
  #endif
  #ifdef TARGA_SUPPORTED
    fprintf(stderr, "  -targa         Select Targa output format%s [legacy feature]\n",
            (DEFAULT_FMT == FMT_TARGA ? " (default)" : ""));
  #endif
    fprintf(stderr, "Switches for advanced users:\n");
  #ifdef DCT_ISLOW_SUPPORTED
    fprintf(stderr, "  -dct int       Use accurate integer DCT method%s\n",
            (JDCT_DEFAULT == JDCT_ISLOW ? " (default)" : ""));
  #endif
  #ifdef DCT_IFAST_SUPPORTED
    fprintf(stderr, "  -dct fast      Use less accurate integer DCT method [legacy feature]%s\n",
            (JDCT_DEFAULT == JDCT_IFAST ? " (default)" : ""));
  #endif
  #ifdef DCT_FLOAT_SUPPORTED
    fprintf(stderr, "  -dct float     Use floating-point DCT method [legacy feature]%s\n",
            (JDCT_DEFAULT == JDCT_FLOAT ? " (default)" : ""));
  #endif
    fprintf(stderr, "  -dither fs     Use Floyd-Steinberg dithering when quantizing colors (default)\n");
    fprintf(stderr, "                 [legacy feature]\n");
    fprintf(stderr, "  -dither none   Don't use dithering when quantizing colors [legacy feature]\n");
    fprintf(stderr, "  -dither ordered  Use ordered dithering when quantizing colors\n");
    fprintf(stderr, "                   [legacy feature]\n");
    fprintf(stderr, "  -icc FILE      Extract ICC profile to FILE\n");
  #ifdef QUANT_2PASS_SUPPORTED
    fprintf(stderr, "  -map FILE      Quantize to colors used in named image file [legacy feature]\n");
  #endif
    fprintf(stderr, "  -nosmooth      Use faster, lower-quality upsampling\n");
  #ifdef QUANT_1PASS_SUPPORTED
    fprintf(stderr, "  -onepass       Use 1-pass color quantization (low quality) [legacy feature]\n");
  #endif
    fprintf(stderr, "  -maxmemory N   Maximum memory to use (in kbytes)\n");
    fprintf(stderr, "  -maxscans N    Maximum number of scans to allow in input file\n");
    fprintf(stderr, "  -outfile name  Specify name for output file\n");
    fprintf(stderr, "  -memsrc        Load input file into memory before decompressing\n");
    fprintf(stderr, "  -report        Report decompression progress\n");
    fprintf(stderr, "  -skip Y0,Y1    Decompress all rows except those between Y0 and Y1 (inclusive)\n");
    fprintf(stderr, "  -crop WxH+X+Y  Decompress only a rectangular subregion of the image\n");
    fprintf(stderr, "                 [requires PBMPLUS (PPM/PGM), GIF, or Targa output format]\n");
    fprintf(stderr, "  -strict        Treat all warnings as fatal\n");
    fprintf(stderr, "  -verbose  or  -debug   Emit debug output\n");
    fprintf(stderr, "  -version       Print version information and exit\n");
    exit(EXIT_FAILURE);
  }
  
  
  LOCAL(int)
  parse_switches(j_decompress_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;
  
    /* Set up default JPEG parameters. */
    requested_fmt = DEFAULT_FMT;  /* set default output file format */
    icc_filename = NULL;
    max_scans = 0;
    outfilename = NULL;
    memsrc = FALSE;
    report = FALSE;
    skip = FALSE;
    crop = FALSE;
    strict = 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, "bmp", 1)) {
        /* BMP output format (Windows flavor). */
        requested_fmt = FMT_BMP;
  
      } else if (keymatch(arg, "colors", 1) || keymatch(arg, "colours", 1) ||
                 keymatch(arg, "quantize", 1) || keymatch(arg, "quantise", 1)) {
        /* Do color quantization. */
        int val;
  
        if (++argn >= argc)       /* advance to next argument */
          usage();
        if (sscanf(argv[argn], "%d", &val) != 1)
          usage();
        cinfo->desired_number_of_colors = val;
        cinfo->quantize_colors = TRUE;
  
      } else if (keymatch(arg, "dct", 2)) {
        /* Select IDCT 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, "dither", 2)) {
        /* Select dithering algorithm. */
        if (++argn >= argc)       /* advance to next argument */
          usage();
        if (keymatch(argv[argn], "fs", 2)) {
          cinfo->dither_mode = JDITHER_FS;
        } else if (keymatch(argv[argn], "none", 2)) {
          cinfo->dither_mode = JDITHER_NONE;
        } else if (keymatch(argv[argn], "ordered", 2)) {
          cinfo->dither_mode = JDITHER_ORDERED;
        } 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, "%s version %s (build %s)\n",
                  PACKAGE_NAME, VERSION, BUILD);
          fprintf(stderr, JCOPYRIGHT1);
          fprintf(stderr, JCOPYRIGHT2 "\n");
          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, "fast", 1)) {
        /* Select recommended processing options for quick-and-dirty output. */
        cinfo->two_pass_quantize = FALSE;
        cinfo->dither_mode = JDITHER_ORDERED;
        if (!cinfo->quantize_colors) /* don't override an earlier -colors */
          cinfo->desired_number_of_colors = 216;
        cinfo->dct_method = JDCT_FASTEST;
        cinfo->do_fancy_upsampling = FALSE;
  
      } else if (keymatch(arg, "gif", 1)) {
        /* GIF output format (LZW-compressed). */
        requested_fmt = FMT_GIF;
  
      } else if (keymatch(arg, "gif0", 4)) {
        /* GIF output format (uncompressed). */
        requested_fmt = FMT_GIF0;
  
      } else if (keymatch(arg, "grayscale", 2) ||
                 keymatch(arg, "greyscale", 2)) {
        /* Force monochrome output. */
        cinfo->out_color_space = JCS_GRAYSCALE;
  
      } else if (keymatch(arg, "rgb", 2)) {
        /* Force RGB output. */
        cinfo->out_color_space = JCS_RGB;
  
      } else if (keymatch(arg, "rgb565", 2)) {
        /* Force RGB565 output. */
        cinfo->out_color_space = JCS_RGB565;
  
      } else if (keymatch(arg, "icc", 1)) {
        /* Set ICC filename. */
        if (++argn >= argc)       /* advance to next argument */
          usage();
        icc_filename = argv[argn];
  #ifdef SAVE_MARKERS_SUPPORTED
        jpeg_save_markers(cinfo, JPEG_APP0 + 2, 0xFFFF);
  #endif
  
      } else if (keymatch(arg, "map", 3)) {
        /* Quantize to a color map taken from an input file. */
        if (++argn >= argc)       /* advance to next argument */
          usage();
        if (for_real) {           /* too expensive to do twice! */
  #ifdef QUANT_2PASS_SUPPORTED    /* otherwise can't quantize to supplied map */
          FILE *mapfile;
  
          if ((mapfile = fopen(argv[argn], READ_BINARY)) == NULL) {
            fprintf(stderr, "%s: can't open %s\n", progname, argv[argn]);
            exit(EXIT_FAILURE);
          }
          if (cinfo->data_precision == 12)
            read_color_map_12(cinfo, mapfile);
          else
            read_color_map(cinfo, mapfile);
          fclose(mapfile);
          cinfo->quantize_colors = TRUE;
  #else
          ERREXIT(cinfo, JERR_NOT_COMPILED);
  #endif
        }
  
      } 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, "maxscans", 4)) {
        if (++argn >= argc)       /* advance to next argument */
          usage();
        if (sscanf(argv[argn], "%u", &max_scans) != 1)
          usage();
  
      } else if (keymatch(arg, "nosmooth", 3)) {
        /* Suppress fancy upsampling */
        cinfo->do_fancy_upsampling = FALSE;
  
      } else if (keymatch(arg, "onepass", 3)) {
        /* Use fast one-pass quantization. */
        cinfo->two_pass_quantize = FALSE;
  
      } else if (keymatch(arg, "os2", 3)) {
        /* BMP output format (OS/2 flavor). */
        requested_fmt = FMT_OS2;
  
      } 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, "memsrc", 2)) {
        /* Use in-memory source manager */
        memsrc = TRUE;
  
      } else if (keymatch(arg, "pnm", 1) || keymatch(arg, "ppm", 1)) {
        /* PPM/PGM output format. */
        requested_fmt = FMT_PPM;
  
      } else if (keymatch(arg, "report", 2)) {
        report = TRUE;
  
      } else if (keymatch(arg, "scale", 1)) {
        /* Scale the output image by a fraction M/N. */
        if (++argn >= argc)       /* advance to next argument */
          usage();
        if (sscanf(argv[argn], "%u/%u",
                   &cinfo->scale_num, &cinfo->scale_denom) != 2)
          usage();
  
      } else if (keymatch(arg, "skip", 2)) {
        int temp_start = -1, temp_end = -1;
        if (++argn >= argc)
          usage();
        if (sscanf(argv[argn], "%d,%d", &temp_start, &temp_end) != 2 ||
            temp_start < 0 || temp_end < 0 || temp_start > temp_end)
          usage();
        skip = TRUE;
        skip_start = temp_start;
        skip_end = temp_end;
  
      } else if (keymatch(arg, "crop", 2)) {
        int temp_width = -1, temp_height = -1, temp_x = -1, temp_y = -1;
        char c;
        if (++argn >= argc)
          usage();
        if (sscanf(argv[argn], "%d%c%d+%d+%d", &temp_width, &c, &temp_height,
                   &temp_x, &temp_y) != 5 ||
            (c != 'X' && c != 'x') || temp_width < 1 || temp_height < 1 ||
            temp_x < 0 || temp_y < 0)
          usage();
        crop = TRUE;
        crop_width = temp_width;
        crop_height = temp_height;
        crop_x = temp_x;
        crop_y = temp_y;
  
      } else if (keymatch(arg, "strict", 2)) {
        strict = TRUE;
  
      } else if (keymatch(arg, "targa", 1)) {
        /* Targa output format. */
        requested_fmt = FMT_TARGA;
  
      } else {
        usage();                  /* bogus switch */
      }
    }
  
    return argn;                  /* return index of next arg (file name) */
  }
  
  
  /*
   * Marker processor for COM and interesting APPn markers.
   * This replaces the library's built-in processor, which just skips the marker.
   * We want to print out the marker as text, to the extent possible.
   * Note this code relies on a non-suspending data source.
   */
  
  LOCAL(unsigned int)
  jpeg_getc(j_decompress_ptr cinfo)
  /* Read next byte */
  {
    struct jpeg_source_mgr *datasrc = cinfo->src;
  
    if (datasrc->bytes_in_buffer == 0) {
      if (!(*datasrc->fill_input_buffer) (cinfo))
        ERREXIT(cinfo, JERR_CANT_SUSPEND);
    }
    datasrc->bytes_in_buffer--;
    return *datasrc->next_input_byte++;
  }
  
  
  METHODDEF(boolean)
  print_text_marker(j_decompress_ptr cinfo)
  {
    boolean traceit = (cinfo->err->trace_level >= 1);
    long length;
    unsigned int ch;
    unsigned int lastch = 0;
  
    length = jpeg_getc(cinfo) << 8;
    length += jpeg_getc(cinfo);
    length -= 2;                  /* discount the length word itself */
  
    if (traceit) {
      if (cinfo->unread_marker == JPEG_COM)
        fprintf(stderr, "Comment, length %ld:\n", (long)length);
      else                        /* assume it is an APPn otherwise */
        fprintf(stderr, "APP%d, length %ld:\n",
                cinfo->unread_marker - JPEG_APP0, (long)length);
    }
  
    while (--length >= 0) {
      ch = jpeg_getc(cinfo);
      if (traceit) {
        /* Emit the character in a readable form.
         * Nonprintables are converted to \nnn form,
         * while \ is converted to \\.
         * Newlines in CR, CR/LF, or LF form will be printed as one newline.
         */
        if (ch == '\r') {
          fprintf(stderr, "\n");
        } else if (ch == '\n') {
          if (lastch != '\r')
            fprintf(stderr, "\n");
        } else if (ch == '\\') {
          fprintf(stderr, "\\\\");
        } else if (isprint(ch)) {
          putc(ch, stderr);
        } else {
          fprintf(stderr, "\\%03o", ch);
        }
        lastch = ch;
      }
    }
  
    if (traceit)
      fprintf(stderr, "\n");
  
    return TRUE;
  }
  
  
  METHODDEF(void)
  my_emit_message(j_common_ptr cinfo, int msg_level)
  {
    if (msg_level < 0) {
      /* Treat warning as fatal */
      cinfo->err->error_exit(cinfo);
    } else {
      if (cinfo->err->trace_level >= msg_level)
        cinfo->err->output_message(cinfo);
    }
  }
  
  
  /*
   * The main program.
   */
  
  int
  main(int argc, char **argv)
  {
    struct jpeg_decompress_struct cinfo;
    struct jpeg_error_mgr jerr;
    struct cdjpeg_progress_mgr progress;
    int file_index;
    djpeg_dest_ptr dest_mgr = NULL;
    FILE *input_file;
    FILE *output_file;
    unsigned char *inbuffer = NULL;
    unsigned long insize = 0;
    JDIMENSION num_scanlines;
  
    progname = argv[0];
    if (progname == NULL || progname[0] == 0)
      progname = "djpeg";         /* in case C library doesn't provide it */
  
    /* Initialize the JPEG decompression object with default error handling. */
    cinfo.err = jpeg_std_error(&jerr);
    jpeg_create_decompress(&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;
  
    /* Insert custom marker processor for COM and APP12.
     * APP12 is used by some digital camera makers for textual info,
     * so we provide the ability to display it as text.
     * If you like, additional APPn marker types can be selected for display,
     * but don't try to override APP0 or APP14 this way (see libjpeg.txt).
     */
    jpeg_set_marker_processor(&cinfo, JPEG_COM, print_text_marker);
    jpeg_set_marker_processor(&cinfo, JPEG_APP0 + 12, print_text_marker);
  
    /* 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.
     * (Exception: tracing level set here controls verbosity for COM markers
     * found during jpeg_read_header...)
     */
  
    file_index = parse_switches(&cinfo, argc, argv, 0, FALSE);
  
    if (strict)
      jerr.emit_message = my_emit_message;
  
  #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();
    }
  
    if (report || max_scans != 0) {
      start_progress_monitor((j_common_ptr)&cinfo, &progress);
      progress.report = report;
      progress.max_scans = max_scans;
    }
  
    /* Specify data source for decompression */
    if (memsrc) {
      size_t nbytes;
      do {
        inbuffer = (unsigned char *)realloc(inbuffer, insize + INPUT_BUF_SIZE);
        if (inbuffer == NULL) {
          fprintf(stderr, "%s: memory allocation failure\n", progname);
          exit(EXIT_FAILURE);
        }
        nbytes = fread(&inbuffer[insize], 1, INPUT_BUF_SIZE, input_file);
        if (nbytes < INPUT_BUF_SIZE && ferror(input_file)) {
          if (file_index < argc)
            fprintf(stderr, "%s: can't read from %s\n", progname,
                    argv[file_index]);
          else
            fprintf(stderr, "%s: can't read from stdin\n", progname);
        }
        insize += (unsigned long)nbytes;
      } while (nbytes == INPUT_BUF_SIZE);
      fprintf(stderr, "Compressed size:  %lu bytes\n", insize);
      jpeg_mem_src(&cinfo, inbuffer, insize);
    } else
      jpeg_stdio_src(&cinfo, input_file);
  
    /* Read file header, set default decompression parameters */
    (void)jpeg_read_header(&cinfo, TRUE);
  
    /* Adjust default decompression parameters by re-parsing the options */
    file_index = parse_switches(&cinfo, argc, argv, 0, TRUE);
  
    /* Initialize the output module now to let it override any crucial
     * option settings (for instance, GIF wants to force color quantization).
     */
    switch (requested_fmt) {
  #ifdef BMP_SUPPORTED
    case FMT_BMP:
      dest_mgr = jinit_write_bmp(&cinfo, FALSE, TRUE);
      break;
    case FMT_OS2:
      dest_mgr = jinit_write_bmp(&cinfo, TRUE, TRUE);
      break;
  #endif
  #ifdef GIF_SUPPORTED
    case FMT_GIF:
      if (cinfo.data_precision == 8)
        dest_mgr = jinit_write_gif(&cinfo, TRUE);
      else if (cinfo.data_precision == 12)
        dest_mgr = j12init_write_gif(&cinfo, TRUE);
      else
        ERREXIT1(&cinfo, JERR_BAD_PRECISION, cinfo.data_precision);
      break;
    case FMT_GIF0:
      dest_mgr = jinit_write_gif(&cinfo, FALSE);
      break;
  #endif
  #ifdef PPM_SUPPORTED
    case FMT_PPM:
      if (cinfo.data_precision <= 8)
        dest_mgr = jinit_write_ppm(&cinfo);
      else if (cinfo.data_precision <= 12)
        dest_mgr = j12init_write_ppm(&cinfo);
      else
  #ifdef D_LOSSLESS_SUPPORTED
        dest_mgr = j16init_write_ppm(&cinfo);
  #else
        ERREXIT1(&cinfo, JERR_BAD_PRECISION, cinfo.data_precision);
  #endif
      break;
  #endif
  #ifdef TARGA_SUPPORTED
    case FMT_TARGA:
      dest_mgr = jinit_write_targa(&cinfo);
      break;
  #endif
    default:
      ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
      break;
    }
    dest_mgr->output_file = output_file;
  
    /* Start decompressor */
    (void)jpeg_start_decompress(&cinfo);
  
    /* Skip rows */
    if (skip) {
      JDIMENSION tmp;
  
      /* Check for valid skip_end.  We cannot check this value until after
       * jpeg_start_decompress() is called.  Note that we have already verified
       * that skip_start <= skip_end.
       */
      if (skip_end > cinfo.output_height - 1) {
        fprintf(stderr, "%s: skip region exceeds image height %u\n", progname,
                cinfo.output_height);
        exit(EXIT_FAILURE);
      }
  
      /* Write output file header.  This is a hack to ensure that the destination
       * manager creates an output image of the proper size.
       */
      tmp = cinfo.output_height;
      cinfo.output_height -= (skip_end - skip_start + 1);
      (*dest_mgr->start_output) (&cinfo, dest_mgr);
      cinfo.output_height = tmp;
  
      if (cinfo.data_precision == 8) {
        /* Process data */
        while (cinfo.output_scanline < skip_start) {
          num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
                                              dest_mgr->buffer_height);
          (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
        }
        if ((tmp = jpeg_skip_scanlines(&cinfo, skip_end - skip_start + 1)) !=
            skip_end - skip_start + 1) {
          fprintf(stderr, "%s: jpeg_skip_scanlines() returned %u rather than %u\n",
                  progname, tmp, skip_end - skip_start + 1);
          exit(EXIT_FAILURE);
        }
        while (cinfo.output_scanline < cinfo.output_height) {
          num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
                                              dest_mgr->buffer_height);
          (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
        }
      } else if (cinfo.data_precision == 12) {
        /* Process data */
        while (cinfo.output_scanline < skip_start) {
          num_scanlines = jpeg12_read_scanlines(&cinfo, dest_mgr->buffer12,
                                                dest_mgr->buffer_height);
          (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
        }
        if ((tmp = jpeg12_skip_scanlines(&cinfo, skip_end - skip_start + 1)) !=
            skip_end - skip_start + 1) {
          fprintf(stderr, "%s: jpeg12_skip_scanlines() returned %u rather than %u\n",
                  progname, tmp, skip_end - skip_start + 1);
          exit(EXIT_FAILURE);
        }
        while (cinfo.output_scanline < cinfo.output_height) {
          num_scanlines = jpeg12_read_scanlines(&cinfo, dest_mgr->buffer12,
                                                dest_mgr->buffer_height);
          (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
        }
      } else
        ERREXIT(&cinfo, JERR_NOTIMPL);
  
    /* Decompress a subregion */
    } else if (crop) {
      JDIMENSION tmp;
  
      /* Check for valid crop dimensions.  We cannot check these values until
       * after jpeg_start_decompress() is called.
       */
      if ((unsigned long long)crop_x + crop_width > cinfo.output_width ||
          (unsigned long long)crop_y + crop_height > cinfo.output_height) {
        fprintf(stderr, "%s: crop dimensions exceed image dimensions %u x %u\n",
                progname, cinfo.output_width, cinfo.output_height);
        exit(EXIT_FAILURE);
      }
  
      if (cinfo.data_precision == 8)
        jpeg_crop_scanline(&cinfo, &crop_x, &crop_width);
      else if (cinfo.data_precision == 12)
        jpeg12_crop_scanline(&cinfo, &crop_x, &crop_width);
      else
        ERREXIT(&cinfo, JERR_NOTIMPL);
      if (dest_mgr->calc_buffer_dimensions)
        (*dest_mgr->calc_buffer_dimensions) (&cinfo, dest_mgr);
      else
        ERREXIT(&cinfo, JERR_UNSUPPORTED_FORMAT);
  
      /* Write output file header.  This is a hack to ensure that the destination
       * manager creates an output image of the proper size.
       */
      tmp = cinfo.output_height;
      cinfo.output_height = crop_height;
      (*dest_mgr->start_output) (&cinfo, dest_mgr);
      cinfo.output_height = tmp;
  
      if (cinfo.data_precision == 8) {
        /* Process data */
        if ((tmp = jpeg_skip_scanlines(&cinfo, crop_y)) != crop_y) {
          fprintf(stderr, "%s: jpeg_skip_scanlines() returned %u rather than %u\n",
                  progname, tmp, crop_y);
          exit(EXIT_FAILURE);
        }
        while (cinfo.output_scanline < crop_y + crop_height) {
          num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
                                              dest_mgr->buffer_height);
          (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
        }
        if ((tmp =
             jpeg_skip_scanlines(&cinfo,
                                 cinfo.output_height - crop_y - crop_height)) !=
            cinfo.output_height - crop_y - crop_height) {
          fprintf(stderr, "%s: jpeg_skip_scanlines() returned %u rather than %u\n",
                  progname, tmp, cinfo.output_height - crop_y - crop_height);
          exit(EXIT_FAILURE);
        }
      } else if (cinfo.data_precision == 12) {
        /* Process data */
        if ((tmp = jpeg12_skip_scanlines(&cinfo, crop_y)) != crop_y) {
          fprintf(stderr, "%s: jpeg12_skip_scanlines() returned %u rather than %u\n",
                  progname, tmp, crop_y);
          exit(EXIT_FAILURE);
        }
        while (cinfo.output_scanline < crop_y + crop_height) {
          num_scanlines = jpeg12_read_scanlines(&cinfo, dest_mgr->buffer12,
                                                dest_mgr->buffer_height);
          (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
        }
        if ((tmp =
             jpeg12_skip_scanlines(&cinfo, cinfo.output_height - crop_y -
                                           crop_height)) !=
            cinfo.output_height - crop_y - crop_height) {
          fprintf(stderr, "%s: jpeg12_skip_scanlines() returned %u rather than %u\n",
                  progname, tmp, cinfo.output_height - crop_y - crop_height);
          exit(EXIT_FAILURE);
        }
      } else
        ERREXIT(&cinfo, JERR_NOTIMPL);
  
    /* Normal full-image decompress */
    } else {
      /* Write output file header */
      (*dest_mgr->start_output) (&cinfo, dest_mgr);
  
      if (cinfo.data_precision <= 8) {
        /* Process data */
        while (cinfo.output_scanline < cinfo.output_height) {
          num_scanlines = jpeg_read_scanlines(&cinfo, dest_mgr->buffer,
                                              dest_mgr->buffer_height);
          (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
        }
      } else if (cinfo.data_precision <= 12) {
        /* Process data */
        while (cinfo.output_scanline < cinfo.output_height) {
          num_scanlines = jpeg12_read_scanlines(&cinfo, dest_mgr->buffer12,
                                                dest_mgr->buffer_height);
          (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
        }
      } else {
  #ifdef D_LOSSLESS_SUPPORTED
        /* Process data */
        while (cinfo.output_scanline < cinfo.output_height) {
          num_scanlines = jpeg16_read_scanlines(&cinfo, dest_mgr->buffer16,
                                                dest_mgr->buffer_height);
          (*dest_mgr->put_pixel_rows) (&cinfo, dest_mgr, num_scanlines);
        }
  #else
        ERREXIT1(&cinfo, JERR_BAD_PRECISION, cinfo.data_precision);
  #endif
      }
    }
  
    /* Hack: count final pass as done in case finish_output does an extra pass.
     * The library won't have updated completed_passes.
     */
    if (report || max_scans != 0)
      progress.pub.completed_passes = progress.pub.total_passes;
  
    if (icc_filename != NULL) {
      FILE *icc_file;
      JOCTET *icc_profile;
      unsigned int icc_len;
  
      if ((icc_file = fopen(icc_filename, WRITE_BINARY)) == NULL) {
        fprintf(stderr, "%s: can't open %s\n", progname, icc_filename);
        exit(EXIT_FAILURE);
      }
      if (jpeg_read_icc_profile(&cinfo, &icc_profile, &icc_len)) {
        if (fwrite(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);
        }
        free(icc_profile);
        fclose(icc_file);
      } else if (cinfo.err->msg_code != JWRN_BOGUS_ICC)
        fprintf(stderr, "%s: no ICC profile data in JPEG file\n", progname);
    }
  
    /* Finish decompression and release memory.
     * I must do it in this order because output module has allocated memory
     * of lifespan JPOOL_IMAGE; it needs to finish before releasing memory.
     */
    (*dest_mgr->finish_output) (&cinfo, dest_mgr);
    (void)jpeg_finish_decompress(&cinfo);
    jpeg_destroy_decompress(&cinfo);
  
    /* Close files, if we opened them */
    if (input_file != stdin)
      fclose(input_file);
    if (output_file != stdout)
      fclose(output_file);
  
    if (report || max_scans != 0)
      end_progress_monitor((j_common_ptr)&cinfo);
  
    if (memsrc)
      free(inbuffer);
  
    /* All done. */
    exit(jerr.num_warnings ? EXIT_WARNING : EXIT_SUCCESS);
    return 0;                     /* suppress no-return-value warnings */
  }
  

Download