/*
 * jpeglib.h
 *
 * 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 defines the application interface for the JPEG library.
 * Most applications using the library need only include this file,
 * and perhaps jerror.h if they want to know the exact error codes.
 */

#ifndef JPEGLIB_H
#  define JPEGLIB_H

/*
 * First we include the configuration files that record how this
 * installation of the JPEG library is set up.  jconfig.h can be
 * generated automatically for many systems.  jmorecfg.h contains
 * manual configuration options that most people need not worry about.
 */

#  ifndef JCONFIG_INCLUDED             /* in case jinclude.h already did */
#    include "jconfig.h"               /* widely used configuration options */
#  endif
#  include "jmorecfg.h"                /* seldom changed options */

/*
 * Version ID for the JPEG library.
 * * Might be useful for tests like "#if JPEG_LIB_VERSION >= 60".
 */

#  define JPEG_LIB_VERSION  62         /* Version 6b */

/*
 * Various constants determining the sizes of things.
 * * All of these are specified by the JPEG standard, so don't change them
 * * if you want to be compatible.
 */

#  define DCTSIZE		    8  /* The basic DCT block is 8x8 samples */
#  define DCTSIZE2	    64         /* DCTSIZE squared; # of elements in a block */
#  define NUM_QUANT_TBLS      4        /* Quantization tables are numbered 0..3 */
#  define NUM_HUFF_TBLS       4        /* Huffman tables are numbered 0..3 */
#  define NUM_ARITH_TBLS      16       /* Arith-coding tables are numbered 0..15 */
#  define MAX_COMPS_IN_SCAN   4        /* JPEG limit on # of components in one scan */
#  define MAX_SAMP_FACTOR     4        /* JPEG limit on sampling factors */
/*
 * Unfortunately, some bozo at Adobe saw no reason to be bound by the standard;
 * * the PostScript DCT filter can emit files with many more than 10 blocks/MCU.
 * * If you happen to run across such a file, you can up D_MAX_BLOCKS_IN_MCU
 * * to handle it.  We even let you do this from the jconfig.h file.  However,
 * * we strongly discourage changing C_MAX_BLOCKS_IN_MCU; just because Adobe
 * * sometimes emits noncompliant files doesn't mean you should too.
 */
#  define C_MAX_BLOCKS_IN_MCU   10     /* compressor's limit on blocks per MCU */
#  ifndef D_MAX_BLOCKS_IN_MCU
#    define D_MAX_BLOCKS_IN_MCU   10   /* decompressor's limit on blocks per MCU */
#  endif

/*
 * Data structures for images (arrays of samples and of DCT coefficients).
 * * On 80x86 machines, the image arrays are too big for near pointers,
 * * but the pointer arrays can fit in near memory.
 */

typedef JSAMPLE FAR *JSAMPROW;         /* ptr to one image row of pixel samples. */
typedef JSAMPROW *JSAMPARRAY;          /* ptr to some rows (a 2-D sample array) */
typedef JSAMPARRAY *JSAMPIMAGE;        /* a 3-D sample array: top index is color */

typedef JCOEF JBLOCK[DCTSIZE2];        /* one block of coefficients */
typedef JBLOCK FAR *JBLOCKROW;         /* pointer to one row of coefficient blocks */
typedef JBLOCKROW *JBLOCKARRAY;        /* a 2-D array of coefficient blocks */
typedef JBLOCKARRAY *JBLOCKIMAGE;      /* a 3-D array of coefficient blocks */

typedef JCOEF FAR *JCOEFPTR;           /* useful in a couple of places */

/*
 * Types for JPEG compression parameters and working tables. 
 */

/*
 * DCT coefficient quantization tables. 
 */

typedef struct {
    /*
     * This array gives the coefficient quantizers in natural array order
     * * (not the zigzag order in which they are stored in a JPEG DQT marker).
     * * CAUTION: IJG versions prior to v6a kept this array in zigzag order.
     */
    UINT16        quantval[DCTSIZE2];  /* quantization step for each coefficient */
    /*
     * This field is used only during compression.  It's initialized FALSE when
     * * the table is created, and set TRUE when it's been output to the file.
     * * You could suppress output of a table by setting this to TRUE.
     * * (See jpeg_suppress_tables for an example.)
     */
    boolean       sent_table;          /* TRUE when table has been output */
} JQUANT_TBL;

/*
 * Huffman coding tables. 
 */

typedef struct {
    /*
     * These two fields directly represent the contents of a JPEG DHT marker 
     */
    UINT8         bits[17];            /* bits[k] = # of symbols with codes of */
    /*
     * length k bits; bits[0] is unused 
     */
    UINT8         huffval[256];        /* The symbols, in order of incr code length */
    /*
     * This field is used only during compression.  It's initialized FALSE when
     * * the table is created, and set TRUE when it's been output to the file.
     * * You could suppress output of a table by setting this to TRUE.
     * * (See jpeg_suppress_tables for an example.)
     */
    boolean       sent_table;          /* TRUE when table has been output */
} JHUFF_TBL;

/*
 * Basic info about one component (color channel). 
 */

typedef struct {
    /*
     * These values are fixed over the whole image. 
     */
    /*
     * For compression, they must be supplied by parameter setup; 
     */
    /*
     * for decompression, they are read from the SOF marker. 
     */
    int           component_id;        /* identifier for this component (0..255) */
    int           component_index;     /* its index in SOF or cinfo->comp_info[] */
    int           h_samp_factor;       /* horizontal sampling factor (1..4) */
    int           v_samp_factor;       /* vertical sampling factor (1..4) */
    int           quant_tbl_no;        /* quantization table selector (0..3) */
    /*
     * These values may vary between scans. 
     */
    /*
     * For compression, they must be supplied by parameter setup; 
     */
    /*
     * for decompression, they are read from the SOS marker. 
     */
    /*
     * The decompressor output side may not use these variables. 
     */
    int           dc_tbl_no;           /* DC entropy table selector (0..3) */
    int           ac_tbl_no;           /* AC entropy table selector (0..3) */

    /*
     * Remaining fields should be treated as private by applications. 
     */

    /*
     * These values are computed during compression or decompression startup: 
     */
    /*
     * Component's size in DCT blocks.
     * * Any dummy blocks added to complete an MCU are not counted; therefore
     * * these values do not depend on whether a scan is interleaved or not.
     */
    JDIMENSION    width_in_blocks;
    JDIMENSION    height_in_blocks;
    /*
     * Size of a DCT block in samples.  Always DCTSIZE for compression.
     * * For decompression this is the size of the output from one DCT block,
     * * reflecting any scaling we choose to apply during the IDCT step.
     * * Values of 1,2,4,8 are likely to be supported.  Note that different
     * * components may receive different IDCT scalings.
     */
    int           DCT_scaled_size;
    /*
     * The downsampled dimensions are the component's actual, unpadded number
     * * of samples at the main buffer (preprocessing/compression interface), thus
     * * downsampled_width = ceil(image_width * Hi/Hmax)
     * * and similarly for height.  For decompression, IDCT scaling is included, so
     * * downsampled_width = ceil(image_width * Hi/Hmax * DCT_scaled_size/DCTSIZE)
     */
    JDIMENSION    downsampled_width;   /* actual width in samples */
    JDIMENSION    downsampled_height;  /* actual height in samples */
    /*
     * This flag is used only for decompression.  In cases where some of the
     * * components will be ignored (eg grayscale output from YCbCr image),
     * * we can skip most computations for the unused components.
     */
    boolean       component_needed;    /* do we need the value of this component? */

    /*
     * These values are computed before starting a scan of the component. 
     */
    /*
     * The decompressor output side may not use these variables. 
     */
    int           MCU_width;           /* number of blocks per MCU, horizontally */
    int           MCU_height;          /* number of blocks per MCU, vertically */
    int           MCU_blocks;          /* MCU_width * MCU_height */
    int           MCU_sample_width;    /* MCU width in samples, MCU_width*DCT_scaled_size */
    int           last_col_width;      /* # of non-dummy blocks across in last MCU */
    int           last_row_height;     /* # of non-dummy blocks down in last MCU */

    /*
     * Saved quantization table for component; NULL if none yet saved.
     * * See jdinput.c comments about the need for this information.
     * * This field is currently used only for decompression.
     */
    JQUANT_TBL   *quant_table;

    /*
     * Private per-component storage for DCT or IDCT subsystem. 
     */
    void         *dct_table;
} jpeg_component_info;

/*
 * The script for encoding a multiple-scan file is an array of these: 
 */

typedef struct {
    int           comps_in_scan;       /* number of components encoded in this scan */
    int           component_index[MAX_COMPS_IN_SCAN];   /* their SOF/comp_info[] indexes */
    int           Ss, Se;              /* progressive JPEG spectral selection parms */
    int           Ah, Al;              /* progressive JPEG successive approx. parms */
} jpeg_scan_info;

/*
 * The decompressor can save APPn and COM markers in a list of these: 
 */

typedef struct jpeg_marker_struct FAR *jpeg_saved_marker_ptr;

struct jpeg_marker_struct {
    jpeg_saved_marker_ptr next;        /* next in list, or NULL */
    UINT8         marker;              /* marker code: JPEG_COM, or JPEG_APP0+n */
    unsigned int  original_length;     /* # bytes of data in the file */
    unsigned int  data_length;         /* # bytes of data saved at data[] */
    JOCTET FAR   *data;                /* the data contained in the marker */
    /*
     * the marker length word is not counted in data_length or original_length 
     */
};

/*
 * Known color spaces. 
 */

typedef enum {
    JCS_UNKNOWN,                       /* error/unspecified */
    JCS_GRAYSCALE,                     /* monochrome */
    JCS_RGB,                           /* red/green/blue */
    JCS_YCbCr,                         /* Y/Cb/Cr (also known as YUV) */
    JCS_CMYK,                          /* C/M/Y/K */
    JCS_YCCK                           /* Y/Cb/Cr/K */
} J_COLOR_SPACE;

/*
 * DCT/IDCT algorithm options. 
 */

typedef enum {
    JDCT_ISLOW,                        /* slow but accurate integer algorithm */
    JDCT_IFAST,                        /* faster, less accurate integer method */
    JDCT_FLOAT                         /* floating-point: accurate, fast on fast HW */
} J_DCT_METHOD;

#  ifndef JDCT_DEFAULT                 /* may be overridden in jconfig.h */
#    define JDCT_DEFAULT  JDCT_ISLOW
#  endif
#  ifndef JDCT_FASTEST                 /* may be overridden in jconfig.h */
#    define JDCT_FASTEST  JDCT_IFAST
#  endif

/*
 * Dithering options for decompression. 
 */

typedef enum {
    JDITHER_NONE,                      /* no dithering */
    JDITHER_ORDERED,                   /* simple ordered dither */
    JDITHER_FS                         /* Floyd-Steinberg error diffusion dither */
} J_DITHER_MODE;

/*
 * Common fields between JPEG compression and decompression master structs. 
 */

#  define jpeg_common_fields \
  struct jpeg_error_mgr * err;	/* Error handler module */\
  struct jpeg_memory_mgr * mem;	/* Memory manager module */\
  struct jpeg_progress_mgr * progress; /* Progress monitor, or NULL if none */\
  void * client_data;		/* Available for use by application */\
  boolean is_decompressor;	/* So common code can tell which is which */\
  int global_state                     /* For checking call sequence validity */

/*
 * Routines that are to be used by both halves of the library are declared
 * * to receive a pointer to this structure.  There are no actual instances of
 * * jpeg_common_struct, only of jpeg_compress_struct and jpeg_decompress_struct.
 */
struct jpeg_common_struct {
    jpeg_common_fields;                /* Fields common to both master struct types */
    /*
     * Additional fields follow in an actual jpeg_compress_struct or
     * * jpeg_decompress_struct.  All three structs must agree on these
     * * initial fields!  (This would be a lot cleaner in C++.)
     */
};

typedef struct jpeg_common_struct *j_common_ptr;
typedef struct jpeg_compress_struct *j_compress_ptr;
typedef struct jpeg_decompress_struct *j_decompress_ptr;

/*
 * Master record for a compression instance 
 */

struct jpeg_compress_struct {
    jpeg_common_fields;                /* Fields shared with jpeg_decompress_struct */

    /*
     * Destination for compressed data 
     */
    struct jpeg_destination_mgr *dest;

    /*
     * Description of source image --- these fields must be filled in by
     * * outer application before starting compression.  in_color_space must
     * * be correct before you can even call jpeg_set_defaults().
     */

    JDIMENSION    image_width;         /* input image width */
    JDIMENSION    image_height;        /* input image height */
    int           input_components;    /* # of color components in input image */
    J_COLOR_SPACE in_color_space;      /* colorspace of input image */

    double        input_gamma;         /* image gamma of input image */

    /*
     * Compression parameters --- these fields must be set before calling
     * * jpeg_start_compress().  We recommend calling jpeg_set_defaults() to
     * * initialize everything to reasonable defaults, then changing anything
     * * the application specifically wants to change.  That way you won't get
     * * burnt when new parameters are added.  Also note that there are several
     * * helper routines to simplify changing parameters.
     */

    int           data_precision;      /* bits of precision in image data */

    int           num_components;      /* # of color components in JPEG image */
    J_COLOR_SPACE jpeg_color_space;    /* colorspace of JPEG image */

    jpeg_component_info *comp_info;
    /*
     * comp_info[i] describes component that appears i'th in SOF 
     */

    JQUANT_TBL   *quant_tbl_ptrs[NUM_QUANT_TBLS];
    /*
     * ptrs to coefficient quantization tables, or NULL if not defined 
     */

    JHUFF_TBL    *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
    JHUFF_TBL    *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
    /*
     * ptrs to Huffman coding tables, or NULL if not defined 
     */

    UINT8         arith_dc_L[NUM_ARITH_TBLS];   /* L values for DC arith-coding tables */
    UINT8         arith_dc_U[NUM_ARITH_TBLS];   /* U values for DC arith-coding tables */
    UINT8         arith_ac_K[NUM_ARITH_TBLS];   /* Kx values for AC arith-coding tables */

    int           num_scans;           /* # of entries in scan_info array */
    const jpeg_scan_info *scan_info;   /* script for multi-scan file, or NULL */
    /*
     * The default value of scan_info is NULL, which causes a single-scan
     * * sequential JPEG file to be emitted.  To create a multi-scan file,
     * * set num_scans and scan_info to point to an array of scan definitions.
     */

    boolean       raw_data_in;         /* TRUE=caller supplies downsampled data */
    boolean       arith_code;          /* TRUE=arithmetic coding, FALSE=Huffman */
    boolean       optimize_coding;     /* TRUE=optimize entropy encoding parms */
    boolean       CCIR601_sampling;    /* TRUE=first samples are cosited */
    int           smoothing_factor;    /* 1..100, or 0 for no input smoothing */
    J_DCT_METHOD  dct_method;          /* DCT algorithm selector */

    /*
     * The restart interval can be specified in absolute MCUs by setting
     * * restart_interval, or in MCU rows by setting restart_in_rows
     * * (in which case the correct restart_interval will be figured
     * * for each scan).
     */
    unsigned int  restart_interval;    /* MCUs per restart, or 0 for no restart */
    int           restart_in_rows;     /* if > 0, MCU rows per restart interval */

    /*
     * Parameters controlling emission of special markers. 
     */

    boolean       write_JFIF_header;   /* should a JFIF marker be written? */
    UINT8         JFIF_major_version;  /* What to write for the JFIF version number */
    UINT8         JFIF_minor_version;
    /*
     * These three values are not used by the JPEG code, merely copied 
     */
    /*
     * into the JFIF APP0 marker.  density_unit can be 0 for unknown, 
     */
    /*
     * 1 for dots/inch, or 2 for dots/cm.  Note that the pixel aspect 
     */
    /*
     * ratio is defined by X_density/Y_density even when density_unit=0. 
     */
    UINT8         density_unit;        /* JFIF code for pixel size units */
    UINT16        X_density;           /* Horizontal pixel density */
    UINT16        Y_density;           /* Vertical pixel density */
    boolean       write_Adobe_marker;  /* should an Adobe marker be written? */

    /*
     * State variable: index of next scanline to be written to
     * * jpeg_write_scanlines().  Application may use this to control its
     * * processing loop, e.g., "while (next_scanline < image_height)".
     */

    JDIMENSION    next_scanline;       /* 0 .. image_height-1  */

    /*
     * Remaining fields are known throughout compressor, but generally
     * * should not be touched by a surrounding application.
     */

    /*
     * These fields are computed during compression startup
     */
    boolean       progressive_mode;    /* TRUE if scan script uses progressive mode */
    int           max_h_samp_factor;   /* largest h_samp_factor */
    int           max_v_samp_factor;   /* largest v_samp_factor */

    JDIMENSION    total_iMCU_rows;     /* # of iMCU rows to be input to coef ctlr */
    /*
     * The coefficient controller receives data in units of MCU rows as defined
     * * for fully interleaved scans (whether the JPEG file is interleaved or not).
     * * There are v_samp_factor * DCTSIZE sample rows of each component in an
     * * "iMCU" (interleaved MCU) row.
     */

    /*
     * These fields are valid during any one scan.
     * They describe the components and MCUs actually appearing in the scan.
     */
    int           comps_in_scan;       /* # of JPEG components in this scan */
    jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN];
    /*
     *cur_comp_info[i] describes component that appears i'th in SOS */

    JDIMENSION    MCUs_per_row;        /* # of MCUs across the image */
    JDIMENSION    MCU_rows_in_scan;    /* # of MCU rows in the image */

    int           blocks_in_MCU;       /* # of DCT blocks per MCU */
    int           MCU_membership[C_MAX_BLOCKS_IN_MCU];
    /*
     * MCU_membership[i] is index in cur_comp_info of component owning 
     */
    /*
     * i'th block in an MCU 
     */

    int           Ss, Se, Ah, Al;      /* progressive JPEG parameters for scan */

    /*
     * Links to compression subobjects (methods and private variables of modules)
     */
    struct jpeg_comp_master *master;
    struct jpeg_c_main_controller *main;
    struct jpeg_c_prep_controller *prep;
    struct jpeg_c_coef_controller *coef;
    struct jpeg_marker_writer *marker;
    struct jpeg_color_converter *cconvert;
    struct jpeg_downsampler *downsample;
    struct jpeg_forward_dct *fdct;
    struct jpeg_entropy_encoder *entropy;
    jpeg_scan_info *script_space;      /* workspace for jpeg_simple_progression */
    int           script_space_size;
};

/*
 * Master record for a decompression instance 
 */

struct jpeg_decompress_struct {
    jpeg_common_fields;                /* Fields shared with jpeg_compress_struct */

    /*
     * Source of compressed data 
     */
    struct jpeg_source_mgr *src;

    /*
     * Basic description of image --- filled in by jpeg_read_header(). 
     */
    /*
     * Application may inspect these values to decide how to process image. 
     */

    JDIMENSION    image_width;         /* nominal image width (from SOF marker) */
    JDIMENSION    image_height;        /* nominal image height */
    int           num_components;      /* # of color components in JPEG image */
    J_COLOR_SPACE jpeg_color_space;    /* colorspace of JPEG image */

    /*
     * Decompression processing parameters --- these fields must be set before
     * * calling jpeg_start_decompress().  Note that jpeg_read_header() initializes
     * * them to default values.
     */

    J_COLOR_SPACE out_color_space;     /* colorspace for output */

    unsigned int  scale_num, scale_denom;       /* fraction by which to scale image */

    double        output_gamma;        /* image gamma wanted in output */

    boolean       buffered_image;      /* TRUE=multiple output passes */
    boolean       raw_data_out;        /* TRUE=downsampled data wanted */

    J_DCT_METHOD  dct_method;          /* IDCT algorithm selector */
    boolean       do_fancy_upsampling; /* TRUE=apply fancy upsampling */
    boolean       do_block_smoothing;  /* TRUE=apply interblock smoothing */

    boolean       quantize_colors;     /* TRUE=colormapped output wanted */
    /*
     * the following are ignored if not quantize_colors: 
     */
    J_DITHER_MODE dither_mode;         /* type of color dithering to use */
    boolean       two_pass_quantize;   /* TRUE=use two-pass color quantization */
    int           desired_number_of_colors;     /* max # colors to use in created colormap */
    /*
     * these are significant only in buffered-image mode: 
     */
    boolean       enable_1pass_quant;  /* enable future use of 1-pass quantizer */
    boolean       enable_external_quant;        /* enable future use of external colormap */
    boolean       enable_2pass_quant;  /* enable future use of 2-pass quantizer */

    /*
     * Description of actual output image that will be returned to application.
     * * These fields are computed by jpeg_start_decompress().
     * * You can also use jpeg_calc_output_dimensions() to determine these values
     * * in advance of calling jpeg_start_decompress().
     */

    JDIMENSION    output_width;        /* scaled image width */
    JDIMENSION    output_height;       /* scaled image height */
    int           out_color_components; /* # of color components in out_color_space */
    int           output_components;   /* # of color components returned */
    /*
     * output_components is 1 (a colormap index) when quantizing colors;
     * * otherwise it equals out_color_components.
     */
    int           rec_outbuf_height;   /* min recommended height of scanline buffer */
    /*
     * If the buffer passed to jpeg_read_scanlines() is less than this many rows
     * * high, space and time will be wasted due to unnecessary data copying.
     * * Usually rec_outbuf_height will be 1 or 2, at most 4.
     */

    /*
     * When quantizing colors, the output colormap is described by these fields.
     * * The application can supply a colormap by setting colormap non-NULL before
     * * calling jpeg_start_decompress; otherwise a colormap is created during
     * * jpeg_start_decompress or jpeg_start_output.
     * * The map has out_color_components rows and actual_number_of_colors columns.
     */
    int           actual_number_of_colors;      /* number of entries in use */
    JSAMPARRAY    colormap;            /* The color map as a 2-D pixel array */

    /*
     * State variables: these variables indicate the progress of decompression.
     * * The application may examine these but must not modify them.
     */

    /*
     * Row index of next scanline to be read from jpeg_read_scanlines().
     * * Application may use this to control its processing loop, e.g.,
     * * "while (output_scanline < output_height)".
     */
    JDIMENSION    output_scanline;     /* 0 .. output_height-1  */

    /*
     * Current input scan number and number of iMCU rows completed in scan.
     * * These indicate the progress of the decompressor input side.
     */
    int           input_scan_number;   /* Number of SOS markers seen so far */
    JDIMENSION    input_iMCU_row;      /* Number of iMCU rows completed */

    /*
     * The "output scan number" is the notional scan being displayed by the
     * * output side.  The decompressor will not allow output scan/row number
     * * to get ahead of input scan/row, but it can fall arbitrarily far behind.
     */
    int           output_scan_number;  /* Nominal scan number being displayed */
    JDIMENSION    output_iMCU_row;     /* Number of iMCU rows read */

    /*
     * Current progression status.  coef_bits[c][i] indicates the precision
     * * with which component c's DCT coefficient i (in zigzag order) is known.
     * * It is -1 when no data has yet been received, otherwise it is the point
     * * transform (shift) value for the most recent scan of the coefficient
     * * (thus, 0 at completion of the progression).
     * * This pointer is NULL when reading a non-progressive file.
     */
    int           (*coef_bits)[DCTSIZE2];       /* -1 or current Al value for each coef */

    /*
     * Internal JPEG parameters --- the application usually need not look at
     * * these fields.  Note that the decompressor output side may not use
     * * any parameters that can change between scans.
     */

    /*
     * Quantization and Huffman tables are carried forward across input
     * * datastreams when processing abbreviated JPEG datastreams.
     */

    JQUANT_TBL   *quant_tbl_ptrs[NUM_QUANT_TBLS];
    /*
     * ptrs to coefficient quantization tables, or NULL if not defined 
     */

    JHUFF_TBL    *dc_huff_tbl_ptrs[NUM_HUFF_TBLS];
    JHUFF_TBL    *ac_huff_tbl_ptrs[NUM_HUFF_TBLS];
    /*
     * ptrs to Huffman coding tables, or NULL if not defined 
     */

    /*
     * These parameters are never carried across datastreams, since they
     * * are given in SOF/SOS markers or defined to be reset by SOI.
     */

    int           data_precision;      /* bits of precision in image data */

    jpeg_component_info *comp_info;
    /*
     * comp_info[i] describes component that appears i'th in SOF 
     */

    boolean       progressive_mode;    /* TRUE if SOFn specifies progressive mode */
    boolean       arith_code;          /* TRUE=arithmetic coding, FALSE=Huffman */

    UINT8         arith_dc_L[NUM_ARITH_TBLS];   /* L values for DC arith-coding tables */
    UINT8         arith_dc_U[NUM_ARITH_TBLS];   /* U values for DC arith-coding tables */
    UINT8         arith_ac_K[NUM_ARITH_TBLS];   /* Kx values for AC arith-coding tables */

    unsigned int  restart_interval;    /* MCUs per restart interval, or 0 for no restart */

    /*
     * These fields record data obtained from optional markers recognized by
     * * the JPEG library.
     */
    boolean       saw_JFIF_marker;     /* TRUE iff a JFIF APP0 marker was found */
    /*
     * Data copied from JFIF marker; only valid if saw_JFIF_marker is TRUE: 
     */
    UINT8         JFIF_major_version;  /* JFIF version number */
    UINT8         JFIF_minor_version;
    UINT8         density_unit;        /* JFIF code for pixel size units */
    UINT16        X_density;           /* Horizontal pixel density */
    UINT16        Y_density;           /* Vertical pixel density */
    boolean       saw_Adobe_marker;    /* TRUE iff an Adobe APP14 marker was found */
    UINT8         Adobe_transform;     /* Color transform code from Adobe marker */

    boolean       CCIR601_sampling;    /* TRUE=first samples are cosited */

    /*
     * Aside from the specific data retained from APPn markers known to the
     * * library, the uninterpreted contents of any or all APPn and COM markers
     * * can be saved in a list for examination by the application.
     */
    jpeg_saved_marker_ptr marker_list; /* Head of list of saved markers */

    /*
     * Remaining fields are known throughout decompressor, but generally
     * * should not be touched by a surrounding application.
     */

    /*
     * These fields are computed during decompression startup
     */
    int           max_h_samp_factor;   /* largest h_samp_factor */
    int           max_v_samp_factor;   /* largest v_samp_factor */

    int           min_DCT_scaled_size; /* smallest DCT_scaled_size of any component */

    JDIMENSION    total_iMCU_rows;     /* # of iMCU rows in image */
    /*
     * The coefficient controller's input and output progress is measured in
     * * units of "iMCU" (interleaved MCU) rows.  These are the same as MCU rows
     * * in fully interleaved JPEG scans, but are used whether the scan is
     * * interleaved or not.  We define an iMCU row as v_samp_factor DCT block
     * * rows of each component.  Therefore, the IDCT output contains
     * * v_samp_factor*DCT_scaled_size sample rows of a component per iMCU row.
     */

    JSAMPLE      *sample_range_limit;  /* table for fast range-limiting */

    /*
     * These fields are valid during any one scan.
     * They describe the components and MCUs actually appearing in the scan.
     * Note that the decompressor output side must not use these fields.
     */
    int           comps_in_scan;       /* # of JPEG components in this scan */
    jpeg_component_info *cur_comp_info[MAX_COMPS_IN_SCAN];
    /*
     *cur_comp_info[i] describes component that appears i'th in SOS */

    JDIMENSION    MCUs_per_row;        /* # of MCUs across the image */
    JDIMENSION    MCU_rows_in_scan;    /* # of MCU rows in the image */

    int           blocks_in_MCU;       /* # of DCT blocks per MCU */
    int           MCU_membership[D_MAX_BLOCKS_IN_MCU];
    /*
     * MCU_membership[i] is index in cur_comp_info of component owning 
     */
    /*
     * i'th block in an MCU 
     */

    int           Ss, Se, Ah, Al;      /* progressive JPEG parameters for scan */

    /*
     * This field is shared between entropy decoder and marker parser.
     * * It is either zero or the code of a JPEG marker that has been
     * * read from the data source, but has not yet been processed.
     */
    int           unread_marker;

    /*
     * Links to decompression subobjects (methods, private variables of modules)
     */
    struct jpeg_decomp_master *master;
    struct jpeg_d_main_controller *main;
    struct jpeg_d_coef_controller *coef;
    struct jpeg_d_post_controller *post;
    struct jpeg_input_controller *inputctl;
    struct jpeg_marker_reader *marker;
    struct jpeg_entropy_decoder *entropy;
    struct jpeg_inverse_dct *idct;
    struct jpeg_upsampler *upsample;
    struct jpeg_color_deconverter *cconvert;
    struct jpeg_color_quantizer *cquantize;
};

/*
 * "Object" declarations for JPEG modules that may be supplied or called
 * * directly by the surrounding application.
 * * As with all objects in the JPEG library, these structs only define the
 * * publicly visible methods and state variables of a module.  Additional
 * * private fields may exist after the public ones.
 */

/*
 * Error handler object 
 */

struct jpeg_error_mgr {
    /*
     * Error exit handler: does not return to caller 
     */
    JMETHOD (void, error_exit, (j_common_ptr cinfo));
    /*
     * Conditionally emit a trace or warning message 
     */
                  JMETHOD (void, emit_message, (j_common_ptr cinfo, int msg_level));
    /*
     * Routine that actually outputs a trace or error message 
     */
                  JMETHOD (void, output_message, (j_common_ptr cinfo));
    /*
     * Format a message string for the most recent JPEG error or message 
     */
                  JMETHOD (void, format_message, (j_common_ptr cinfo, char *buffer));
#  define JMSG_LENGTH_MAX  200         /* recommended size of format_message buffer */
    /*
     * Reset error state variables at start of a new image 
     */
                  JMETHOD (void, reset_error_mgr, (j_common_ptr cinfo));

    /*
     * The message ID code and any parameters are saved here.
     * * A message can have one string parameter or up to 8 int parameters.
     */
    int           msg_code;
#  define JMSG_STR_PARM_MAX  80
    union {
        int           i[8];
        char          s[JMSG_STR_PARM_MAX];
    } msg_parm;

    /*
     * Standard state variables for error facility 
     */

    int           trace_level;         /* max msg_level that will be displayed */

    /*
     * For recoverable corrupt-data errors, we emit a warning message,
     * * but keep going unless emit_message chooses to abort.  emit_message
     * * should count warnings in num_warnings.  The surrounding application
     * * can check for bad data by seeing if num_warnings is nonzero at the
     * * end of processing.
     */
    long          num_warnings;        /* number of corrupt-data warnings */

    /*
     * These fields point to the table(s) of error message strings.
     * * An application can change the table pointer to switch to a different
     * * message list (typically, to change the language in which errors are
     * * reported).  Some applications may wish to add additional error codes
     * * that will be handled by the JPEG library error mechanism; the second
     * * table pointer is used for this purpose.
     * *
     * * First table includes all errors generated by JPEG library itself.
     * * Error code 0 is reserved for a "no such error string" message.
     */
    const char   *const *jpeg_message_table;    /* Library errors */
    int           last_jpeg_message;   /* Table contains strings 0..last_jpeg_message */
    /*
     * Second table can be added by application (see cjpeg/djpeg for example).
     * * It contains strings numbered first_addon_message..last_addon_message.
     */
    const char   *const *addon_message_table;   /* Non-library errors */
    int           first_addon_message; /* code for first string in addon table */
    int           last_addon_message;  /* code for last string in addon table */
};

/*
 * Progress monitor object 
 */

struct jpeg_progress_mgr {
    JMETHOD (void, progress_monitor, (j_common_ptr cinfo));

    long          pass_counter;        /* work units completed in this pass */
    long          pass_limit;          /* total number of work units in this pass */
    int           completed_passes;    /* passes completed so far */
    int           total_passes;        /* total number of passes expected */
};

/*
 * Data destination object for compression 
 */

struct jpeg_destination_mgr {
    JOCTET       *next_output_byte;    /* => next byte to write in buffer */
    size_t        free_in_buffer;      /* # of byte spaces remaining in buffer */

                  JMETHOD (void, init_destination, (j_compress_ptr cinfo));
                  JMETHOD (boolean, empty_output_buffer, (j_compress_ptr cinfo));
                  JMETHOD (void, term_destination, (j_compress_ptr cinfo));
};

/*
 * Data source object for decompression 
 */

struct jpeg_source_mgr {
    const JOCTET *next_input_byte;     /* => next byte to read from buffer */
    size_t        bytes_in_buffer;     /* # of bytes remaining in buffer */

                  JMETHOD (void, init_source, (j_decompress_ptr cinfo));
                  JMETHOD (boolean, fill_input_buffer, (j_decompress_ptr cinfo));
                  JMETHOD (void, skip_input_data, (j_decompress_ptr cinfo, long num_bytes));
                  JMETHOD (boolean, resync_to_restart, (j_decompress_ptr cinfo, int desired));
                  JMETHOD (void, term_source, (j_decompress_ptr cinfo));
};

/*
 * Memory manager object.
 * * Allocates "small" objects (a few K total), "large" objects (tens of K),
 * * and "really big" objects (virtual arrays with backing store if needed).
 * * The memory manager does not allow individual objects to be freed; rather,
 * * each created object is assigned to a pool, and whole pools can be freed
 * * at once.  This is faster and more convenient than remembering exactly what
 * * to free, especially where malloc()/free() are not too speedy.
 * * NB: alloc routines never return NULL.  They exit to error_exit if not
 * * successful.
 */

#  define JPOOL_PERMANENT	0      /* lasts until master record is destroyed */
#  define JPOOL_IMAGE	1              /* lasts until done with image/datastream */
#  define JPOOL_NUMPOOLS	2

typedef struct jvirt_sarray_control *jvirt_sarray_ptr;
typedef struct jvirt_barray_control *jvirt_barray_ptr;

struct jpeg_memory_mgr {
    /*
     * Method pointers 
     */
    JMETHOD (void *, alloc_small, (j_common_ptr cinfo, int pool_id, size_t sizeofobject));
                  JMETHOD (void FAR *, alloc_large, (j_common_ptr cinfo, int pool_id, size_t sizeofobject));
                  JMETHOD (JSAMPARRAY, alloc_sarray,
                           (j_common_ptr cinfo, int pool_id, JDIMENSION samplesperrow, JDIMENSION numrows));
                  JMETHOD (JBLOCKARRAY, alloc_barray,
                           (j_common_ptr cinfo, int pool_id, JDIMENSION blocksperrow, JDIMENSION numrows));
                  JMETHOD (jvirt_sarray_ptr, request_virt_sarray,
                           (j_common_ptr cinfo, int pool_id, boolean pre_zero, JDIMENSION samplesperrow,
                            JDIMENSION numrows, JDIMENSION maxaccess));
                  JMETHOD (jvirt_barray_ptr, request_virt_barray,
                           (j_common_ptr cinfo, int pool_id, boolean pre_zero, JDIMENSION blocksperrow,
                            JDIMENSION numrows, JDIMENSION maxaccess));
                  JMETHOD (void, realize_virt_arrays, (j_common_ptr cinfo));
                  JMETHOD (JSAMPARRAY, access_virt_sarray,
                           (j_common_ptr cinfo, jvirt_sarray_ptr ptr, JDIMENSION start_row, JDIMENSION num_rows,
                            boolean writable));
                  JMETHOD (JBLOCKARRAY, access_virt_barray,
                           (j_common_ptr cinfo, jvirt_barray_ptr ptr, JDIMENSION start_row, JDIMENSION num_rows,
                            boolean writable));
                  JMETHOD (void, free_pool, (j_common_ptr cinfo, int pool_id));
                  JMETHOD (void, self_destruct, (j_common_ptr cinfo));

    /*
     * Limit on memory allocation for this JPEG object.  (Note that this is
     * * merely advisory, not a guaranteed maximum; it only affects the space
     * * used for virtual-array buffers.)  May be changed by outer application
     * * after creating the JPEG object.
     */
    long          max_memory_to_use;

    /*
     * Maximum allocation request accepted by alloc_large. 
     */
    long          max_alloc_chunk;
};

/*
 * Routine signature for application-supplied marker processing methods.
 * * Need not pass marker code since it is stored in cinfo->unread_marker.
 */
typedef       JMETHOD (boolean, jpeg_marker_parser_method, (j_decompress_ptr cinfo));

/*
 * Declarations for routines called by application.
 * * The JPP macro hides prototype parameters from compilers that can't cope.
 * * Note JPP requires double parentheses.
 */

#  ifdef HAVE_PROTOTYPES
#    define JPP(arglist)	arglist
#  else
#    define JPP(arglist)	()
#  endif

/*
 * Short forms of external names for systems with brain-damaged linkers.
 * * We shorten external names to be unique in the first six letters, which
 * * is good enough for all known systems.
 * * (If your compiler itself needs names to be unique in less than 15
 * * characters, you are out of luck.  Get a better compiler.)
 */

#  ifdef NEED_SHORT_EXTERNAL_NAMES
#    define jpeg_std_error		jStdError
#    define jpeg_CreateCompress	jCreaCompress
#    define jpeg_CreateDecompress	jCreaDecompress
#    define jpeg_destroy_compress	jDestCompress
#    define jpeg_destroy_decompress	jDestDecompress
#    define jpeg_stdio_dest		jStdDest
#    define jpeg_stdio_src		jStdSrc
#    define jpeg_set_defaults	jSetDefaults
#    define jpeg_set_colorspace	jSetColorspace
#    define jpeg_default_colorspace	jDefColorspace
#    define jpeg_set_quality	jSetQuality
#    define jpeg_set_linear_quality	jSetLQuality
#    define jpeg_add_quant_table	jAddQuantTable
#    define jpeg_quality_scaling	jQualityScaling
#    define jpeg_simple_progression	jSimProgress
#    define jpeg_suppress_tables	jSuppressTables
#    define jpeg_alloc_quant_table	jAlcQTable
#    define jpeg_alloc_huff_table	jAlcHTable
#    define jpeg_start_compress	jStrtCompress
#    define jpeg_write_scanlines	jWrtScanlines
#    define jpeg_finish_compress	jFinCompress
#    define jpeg_write_raw_data	jWrtRawData
#    define jpeg_write_marker	jWrtMarker
#    define jpeg_write_m_header	jWrtMHeader
#    define jpeg_write_m_byte	jWrtMByte
#    define jpeg_write_tables	jWrtTables
#    define jpeg_read_header	jReadHeader
#    define jpeg_start_decompress	jStrtDecompress
#    define jpeg_read_scanlines	jReadScanlines
#    define jpeg_finish_decompress	jFinDecompress
#    define jpeg_read_raw_data	jReadRawData
#    define jpeg_has_multiple_scans	jHasMultScn
#    define jpeg_start_output	jStrtOutput
#    define jpeg_finish_output	jFinOutput
#    define jpeg_input_complete	jInComplete
#    define jpeg_new_colormap	jNewCMap
#    define jpeg_consume_input	jConsumeInput
#    define jpeg_calc_output_dimensions	jCalcDimensions
#    define jpeg_save_markers	jSaveMarkers
#    define jpeg_set_marker_processor	jSetMarker
#    define jpeg_read_coefficients	jReadCoefs
#    define jpeg_write_coefficients	jWrtCoefs
#    define jpeg_copy_critical_parameters	jCopyCrit
#    define jpeg_abort_compress	jAbrtCompress
#    define jpeg_abort_decompress	jAbrtDecompress
#    define jpeg_abort		jAbort
#    define jpeg_destroy		jDestroy
#    define jpeg_resync_to_restart	jResyncRestart
#  endif                               /* NEED_SHORT_EXTERNAL_NAMES */

/*
 * Default error-management setup 
 */
EXTERN (struct jpeg_error_mgr *) jpeg_std_error JPP ((struct jpeg_error_mgr * err));

/*
 * Initialization of JPEG compression objects.
 * * jpeg_create_compress() and jpeg_create_decompress() are the exported
 * * names that applications should call.  These expand to calls on
 * * jpeg_CreateCompress and jpeg_CreateDecompress with additional information
 * * passed for version mismatch checking.
 * * NB: you must set up the error-manager BEFORE calling jpeg_create_xxx.
 */
#  define jpeg_create_compress(cinfo) \
    jpeg_CreateCompress((cinfo), JPEG_LIB_VERSION, \
			(size_t) sizeof(struct jpeg_compress_struct))
#  define jpeg_create_decompress(cinfo) \
    jpeg_CreateDecompress((cinfo), JPEG_LIB_VERSION, \
			  (size_t) sizeof(struct jpeg_decompress_struct))
EXTERN (void)
jpeg_CreateCompress JPP ((j_compress_ptr cinfo, int version, size_t structsize));
EXTERN (void)
jpeg_CreateDecompress JPP ((j_decompress_ptr cinfo, int version, size_t structsize));
/*
 * Destruction of JPEG compression objects 
 */
EXTERN (void)
jpeg_destroy_compress JPP ((j_compress_ptr cinfo));
EXTERN (void)
jpeg_destroy_decompress JPP ((j_decompress_ptr cinfo));

/*
 * Standard data source and destination managers: stdio streams. 
 */
/*
 * Caller is responsible for opening the file before and closing after. 
 */
EXTERN (void)
jpeg_stdio_dest JPP ((j_compress_ptr cinfo, FILE * outfile));
EXTERN (void)
jpeg_stdio_src JPP ((j_decompress_ptr cinfo, FILE * infile));

/*
 * Default parameter setup for compression 
 */
EXTERN (void)
jpeg_set_defaults JPP ((j_compress_ptr cinfo));
/*
 * Compression parameter setup aids 
 */
EXTERN (void)
jpeg_set_colorspace JPP ((j_compress_ptr cinfo, J_COLOR_SPACE colorspace));
EXTERN (void)
jpeg_default_colorspace JPP ((j_compress_ptr cinfo));
EXTERN (void)
jpeg_set_quality JPP ((j_compress_ptr cinfo, int quality, boolean force_baseline));
EXTERN (void)
jpeg_set_linear_quality JPP ((j_compress_ptr cinfo, int scale_factor, boolean force_baseline));
EXTERN (void)
jpeg_add_quant_table
JPP ((j_compress_ptr cinfo, int which_tbl, const unsigned int *basic_table, int scale_factor, boolean force_baseline));
EXTERN (int)
jpeg_quality_scaling JPP ((int quality));
EXTERN (void)
jpeg_simple_progression JPP ((j_compress_ptr cinfo));
EXTERN (void)
jpeg_suppress_tables JPP ((j_compress_ptr cinfo, boolean suppress));
EXTERN (JQUANT_TBL *)
jpeg_alloc_quant_table JPP ((j_common_ptr cinfo));
EXTERN (JHUFF_TBL *)
jpeg_alloc_huff_table JPP ((j_common_ptr cinfo));

/*
 * Main entry points for compression 
 */
EXTERN (void)
jpeg_start_compress JPP ((j_compress_ptr cinfo, boolean write_all_tables));
EXTERN (JDIMENSION)
jpeg_write_scanlines JPP ((j_compress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION num_lines));
EXTERN (void)
jpeg_finish_compress JPP ((j_compress_ptr cinfo));

/*
 * Replaces jpeg_write_scanlines when writing raw downsampled data. 
 */
EXTERN (JDIMENSION)
jpeg_write_raw_data JPP ((j_compress_ptr cinfo, JSAMPIMAGE data, JDIMENSION num_lines));

/*
 * Write a special marker.  See libjpeg.doc concerning safe usage. 
 */
EXTERN (void) jpeg_write_marker JPP ((j_compress_ptr cinfo, int marker, const JOCTET * dataptr, unsigned int datalen));
/*
 * Same, but piecemeal. 
 */
EXTERN (void) jpeg_write_m_header JPP ((j_compress_ptr cinfo, int marker, unsigned int datalen));
EXTERN (void) jpeg_write_m_byte JPP ((j_compress_ptr cinfo, int val));

/*
 * Alternate compression function: just write an abbreviated table file 
 */
EXTERN (void)
jpeg_write_tables JPP ((j_compress_ptr cinfo));

/*
 * Decompression startup: read start of JPEG datastream to see what's there 
 */
EXTERN (int)
jpeg_read_header JPP ((j_decompress_ptr cinfo, boolean require_image));
/*
 * Return value is one of: 
 */
#  define JPEG_SUSPENDED		0
                                       /* Suspended due to lack of input data */
#  define JPEG_HEADER_OK		1
                                       /* Found valid image datastream */
#  define JPEG_HEADER_TABLES_ONLY	2
                                       /* Found valid table-specs-only datastream */
/*
 * If you pass require_image = TRUE (normal case), you need not check for
 * * a TABLES_ONLY return code; an abbreviated file will cause an error exit.
 * * JPEG_SUSPENDED is only possible if you use a data source module that can
 * * give a suspension return (the stdio source module doesn't).
 */

/*
 * Main entry points for decompression 
 */
EXTERN (boolean)
jpeg_start_decompress JPP ((j_decompress_ptr cinfo));
EXTERN (JDIMENSION)
jpeg_read_scanlines JPP ((j_decompress_ptr cinfo, JSAMPARRAY scanlines, JDIMENSION max_lines));
EXTERN (boolean)
jpeg_finish_decompress JPP ((j_decompress_ptr cinfo));

/*
 * Replaces jpeg_read_scanlines when reading raw downsampled data. 
 */
EXTERN (JDIMENSION)
jpeg_read_raw_data JPP ((j_decompress_ptr cinfo, JSAMPIMAGE data, JDIMENSION max_lines));

/*
 * Additional entry points for buffered-image mode. 
 */
EXTERN (boolean)
jpeg_has_multiple_scans JPP ((j_decompress_ptr cinfo));
EXTERN (boolean)
jpeg_start_output JPP ((j_decompress_ptr cinfo, int scan_number));
EXTERN (boolean)
jpeg_finish_output JPP ((j_decompress_ptr cinfo));
EXTERN (boolean)
jpeg_input_complete JPP ((j_decompress_ptr cinfo));
EXTERN (void)
jpeg_new_colormap JPP ((j_decompress_ptr cinfo));
EXTERN (int)
jpeg_consume_input JPP ((j_decompress_ptr cinfo));
/*
 * Return value is one of: 
 */
/*
 * #define JPEG_SUSPENDED       0    Suspended due to lack of input data 
 */
#  define JPEG_REACHED_SOS	1      /* Reached start of new scan */
#  define JPEG_REACHED_EOI	2      /* Reached end of image */
#  define JPEG_ROW_COMPLETED	3      /* Completed one iMCU row */
#  define JPEG_SCAN_COMPLETED	4      /* Completed last iMCU row of a scan */

/*
 * Precalculate output dimensions for current decompression parameters. 
 */
EXTERN (void)
jpeg_calc_output_dimensions JPP ((j_decompress_ptr cinfo));

/*
 * Control saving of COM and APPn markers into marker_list. 
 */
EXTERN (void) jpeg_save_markers JPP ((j_decompress_ptr cinfo, int marker_code, unsigned int length_limit));

/*
 * Install a special processing method for COM or APPn markers. 
 */
EXTERN (void) jpeg_set_marker_processor
JPP ((j_decompress_ptr cinfo, int marker_code, jpeg_marker_parser_method routine));

/*
 * Read or write raw DCT coefficients --- useful for lossless transcoding. 
 */
EXTERN (jvirt_barray_ptr *)
jpeg_read_coefficients JPP ((j_decompress_ptr cinfo));
EXTERN (void)
jpeg_write_coefficients JPP ((j_compress_ptr cinfo, jvirt_barray_ptr * coef_arrays));
EXTERN (void)
jpeg_copy_critical_parameters JPP ((j_decompress_ptr srcinfo, j_compress_ptr dstinfo));

/*
 * If you choose to abort compression or decompression before completing
 * * jpeg_finish_(de)compress, then you need to clean up to release memory,
 * * temporary files, etc.  You can just call jpeg_destroy_(de)compress
 * * if you're done with the JPEG object, but if you want to clean it up and
 * * reuse it, call this:
 */
EXTERN (void)
jpeg_abort_compress JPP ((j_compress_ptr cinfo));
EXTERN (void)
jpeg_abort_decompress JPP ((j_decompress_ptr cinfo));

/*
 * Generic versions of jpeg_abort and jpeg_destroy that work on either
 * * flavor of JPEG object.  These may be more convenient in some places.
 */
EXTERN (void)
jpeg_abort JPP ((j_common_ptr cinfo));
EXTERN (void)
jpeg_destroy JPP ((j_common_ptr cinfo));

/*
 * Default restart-marker-resync procedure for use by data source modules 
 */
EXTERN (boolean)
jpeg_resync_to_restart JPP ((j_decompress_ptr cinfo, int desired));

/*
 * These marker codes are exported since applications and data source modules
 * * are likely to want to use them.
 */

#  define JPEG_RST0	0xD0           /* RST0 marker code */
#  define JPEG_EOI	0xD9           /* EOI marker code */
#  define JPEG_APP0	0xE0           /* APP0 marker code */
#  define JPEG_COM	0xFE           /* COM marker code */

/*
 * If we have a brain-damaged compiler that emits warnings (or worse, errors)
 * * for structure definitions that are never filled in, keep it quiet by
 * * supplying dummy definitions for the various substructures.
 */

#  ifdef INCOMPLETE_TYPES_BROKEN
#    ifndef JPEG_INTERNALS             /* will be defined in jpegint.h */
struct jvirt_sarray_control {
    long dummy;
};
struct jvirt_barray_control {
    long dummy;
};
struct jpeg_comp_master {
    long dummy;
};
struct jpeg_c_main_controller {
    long dummy;
};
struct jpeg_c_prep_controller {
    long dummy;
};
struct jpeg_c_coef_controller {
    long dummy;
};
struct jpeg_marker_writer {
    long dummy;
};
struct jpeg_color_converter {
    long dummy;
};
struct jpeg_downsampler {
    long dummy;
};
struct jpeg_forward_dct {
    long dummy;
};
struct jpeg_entropy_encoder {
    long dummy;
};
struct jpeg_decomp_master {
    long dummy;
};
struct jpeg_d_main_controller {
    long dummy;
};
struct jpeg_d_coef_controller {
    long dummy;
};
struct jpeg_d_post_controller {
    long dummy;
};
struct jpeg_input_controller {
    long dummy;
};
struct jpeg_marker_reader {
    long dummy;
};
struct jpeg_entropy_decoder {
    long dummy;
};
struct jpeg_inverse_dct {
    long dummy;
};
struct jpeg_upsampler {
    long dummy;
};
struct jpeg_color_deconverter {
    long dummy;
};
struct jpeg_color_quantizer {
    long dummy;
};
#    endif                             /* JPEG_INTERNALS */
#  endif                               /* INCOMPLETE_TYPES_BROKEN */

/*
 * The JPEG library modules define JPEG_INTERNALS before including this file.
 * The internal structure declarations are read only when that is true.
 * Applications using the library should not include jpegint.h, but may wish
 * to include jerror.h.
 */

#  ifdef JPEG_INTERNALS
#    include "jpegint.h"               /* fetch private declarations */
#    include "jerror.h"                /* fetch error codes too */
#  endif

#endif                                 /* JPEGLIB_H */
