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 /*
  * jpeglib.h
  *
  * Copyright (C) 1991-1998, Thomas G. Lane.
  * Modified 2002-2020 by Guido Vollbeding.
  * 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 */
 
 
 #ifdef __cplusplus
 #ifndef DONT_USE_EXTERN_C
 extern "C" {
 #endif
 #endif
 
 /* Version IDs for the JPEG library.
  * Might be useful for tests like "#if JPEG_LIB_VERSION >= 90".
  */
 
 #define JPEG_LIB_VERSION        90  /* Compatibility version 9.0 */
 #define JPEG_LIB_VERSION_MAJOR  9
 #define JPEG_LIB_VERSION_MINOR  5
 
 
 /* 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 coefficients */
 #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,
    * reflecting any scaling we choose to apply during the DCT step.
    * Values from 1 to 16 are supported.
    * Note that different components may receive different DCT scalings.
    */
   int DCT_h_scaled_size;
   int DCT_v_scaled_size;
   /* The downsampled dimensions are the component's actual, unpadded number
    * of samples at the main buffer (preprocessing/compression interface);
    * DCT scaling is included, so
    * downsampled_width =
    *   ceil(image_width * Hi/Hmax * DCT_h_scaled_size/block_size)
    * and similarly for height.
    */
   JDIMENSION downsampled_width;  /* actual width in samples */
   JDIMENSION downsampled_height; /* actual height in samples */
   /* 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.
    * For compression, some of the components will need further quantization
    * scale by factor of 2 after DCT (eg BG_YCC output from normal RGB input).
    * The field is first set TRUE for decompression, FALSE for compression
    * in initial_setup, and then adapted in color conversion setup.
    */
   boolean component_needed;
 
   /* 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_h_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, standard RGB (sRGB) */
     JCS_YCbCr,      /* Y/Cb/Cr (also known as YUV), standard YCC */
     JCS_CMYK,       /* C/M/Y/K */
     JCS_YCCK,       /* Y/Cb/Cr/K */
     JCS_BG_RGB,     /* big gamut red/green/blue, bg-sRGB */
     JCS_BG_YCC      /* big gamut Y/Cb/Cr, bg-sYCC */
 } J_COLOR_SPACE;
 
 /* Supported color transforms. */
 
 typedef enum {
     JCT_NONE           = 0,
     JCT_SUBTRACT_GREEN = 1
 } J_COLOR_TRANSFORM;
 
 /* 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.
    */
 
   unsigned int scale_num, scale_denom; /* fraction by which to scale image */
 
   JDIMENSION jpeg_width;    /* scaled JPEG image width */
   JDIMENSION jpeg_height;   /* scaled JPEG image height */
   /* Dimensions of actual JPEG image that will be written to file,
    * derived from input dimensions by scaling factors above.
    * These fields are computed by jpeg_start_compress().
    * You can also use jpeg_calc_jpeg_dimensions() to determine these values
    * in advance of calling jpeg_start_compress().
    */
 
   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];
   int q_scale_factor[NUM_QUANT_TBLS];
   /* ptrs to coefficient quantization tables, or NULL if not defined,
    * and corresponding scale factors (percentage, initialized 100).
    */
 
   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 */
   boolean do_fancy_downsampling; /* TRUE=apply fancy downsampling */
   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? */
 
   J_COLOR_TRANSFORM color_transform;
   /* Color transform identifier, writes LSE marker if nonzero */
 
   /* 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 */
 
   int min_DCT_h_scaled_size;    /* smallest DCT_h_scaled_size of any component */
   int min_DCT_v_scaled_size;    /* smallest DCT_v_scaled_size of any component */
 
   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 * DCT_v_scaled_size 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 */
 
   int block_size;       /* the basic DCT block size: 1..16 */
   const int * natural_order;    /* natural-order position array */
   int lim_Se;           /* min( Se, DCTSIZE2-1 ) */
 
   /*
    * 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 is_baseline;      /* TRUE if Baseline SOF0 encountered */
   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 */
 
   J_COLOR_TRANSFORM color_transform;
   /* Color transform identifier derived from LSE marker, otherwise zero */
 
   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_h_scaled_size;    /* smallest DCT_h_scaled_size of any component */
   int min_DCT_v_scaled_size;    /* smallest DCT_v_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_v_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 */
 
   /* These fields are derived from Se of first SOS marker.
    */
   int block_size;       /* the basic DCT block size: 1..16 */
   const int * natural_order; /* natural-order position array for entropy decode */
   int lim_Se;           /* min( Se, DCTSIZE2-1 ) for entropy decode */
 
   /* 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(noreturn_t, 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_mem_dest       jMemDest
 #define jpeg_mem_src        jMemSrc
 #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_default_qtables    jDefQTables
 #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_std_huff_table jStdHTable
 #define jpeg_start_compress jStrtCompress
 #define jpeg_write_scanlines    jWrtScanlines
 #define jpeg_finish_compress    jFinCompress
 #define jpeg_calc_jpeg_dimensions   jCjpegDimensions
 #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_core_output_dimensions jCoreDimensions
 #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));
 
 /* Data source and destination managers: memory buffers. */
 EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
                    unsigned char ** outbuffer,
                    size_t * outsize));
 EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
                   const unsigned char * inbuffer,
                   size_t insize));
 
 /* 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_default_qtables JPP((j_compress_ptr cinfo,
                        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));
 EXTERN(JHUFF_TBL *) jpeg_std_huff_table JPP((j_common_ptr cinfo,
                          boolean isDC, int tblno));
 
 /* 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));
 
 /* Precalculate JPEG dimensions for current compression parameters. */
 EXTERN(void) jpeg_calc_jpeg_dimensions 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.txt 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_core_output_dimensions JPP((j_decompress_ptr cinfo));
 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
 
 #ifdef __cplusplus
 #ifndef DONT_USE_EXTERN_C
 }
 #endif
 #endif
 
 #endif /* JPEGLIB_H */

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