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jpegint.h
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/*
* jpegint.h
*
* This file was part of the Independent JPEG Group's software:
* Copyright (C) 1991-1997, Thomas G. Lane.
* Modified 1997-2009 by Guido Vollbeding.
* Lossless JPEG Modifications:
* Copyright (C) 1999, Ken Murchison.
* libjpeg-turbo Modifications:
* Copyright (C) 2015-2017, 2019, 2021-2022, D. R. Commander.
* Copyright (C) 2015, Google, Inc.
* Copyright (C) 2021, Alex Richardson.
* For conditions of distribution and use, see the accompanying README.ijg
* file.
*
* This file provides common declarations for the various JPEG modules.
* These declarations are considered internal to the JPEG library; most
* applications using the library shouldn't need to include this file.
*/
/* Representation of a spatial difference value.
* This should be a signed value of at least 16 bits; int is usually OK.
*/
typedef int JDIFF;
typedef JDIFF FAR *JDIFFROW; /* pointer to one row of difference values */
typedef JDIFFROW *JDIFFARRAY; /* ptr to some rows (a 2-D diff array) */
typedef JDIFFARRAY *JDIFFIMAGE; /* a 3-D diff array: top index is color */
/* Declarations for both compression & decompression */
typedef enum { /* Operating modes for buffer controllers */
JBUF_PASS_THRU, /* Plain stripwise operation */
/* Remaining modes require a full-image buffer to have been created */
JBUF_SAVE_SOURCE, /* Run source subobject only, save output */
JBUF_CRANK_DEST, /* Run dest subobject only, using saved data */
JBUF_SAVE_AND_PASS /* Run both subobjects, save output */
} J_BUF_MODE;
/* Values of global_state field (jdapi.c has some dependencies on ordering!) */
#define CSTATE_START 100 /* after create_compress */
#define CSTATE_SCANNING 101 /* start_compress done, write_scanlines OK */
#define CSTATE_RAW_OK 102 /* start_compress done, write_raw_data OK */
#define CSTATE_WRCOEFS 103 /* jpeg_write_coefficients done */
#define DSTATE_START 200 /* after create_decompress */
#define DSTATE_INHEADER 201 /* reading header markers, no SOS yet */
#define DSTATE_READY 202 /* found SOS, ready for start_decompress */
#define DSTATE_PRELOAD 203 /* reading multiscan file in start_decompress*/
#define DSTATE_PRESCAN 204 /* performing dummy pass for 2-pass quant */
#define DSTATE_SCANNING 205 /* start_decompress done, read_scanlines OK */
#define DSTATE_RAW_OK 206 /* start_decompress done, read_raw_data OK */
#define DSTATE_BUFIMAGE 207 /* expecting jpeg_start_output */
#define DSTATE_BUFPOST 208 /* looking for SOS/EOI in jpeg_finish_output */
#define DSTATE_RDCOEFS 209 /* reading file in jpeg_read_coefficients */
#define DSTATE_STOPPING 210 /* looking for EOI in jpeg_finish_decompress */
/* JLONG must hold at least signed 32-bit values. */
typedef long JLONG;
/* JUINTPTR must hold pointer values. */
#ifdef __UINTPTR_TYPE__
/*
* __UINTPTR_TYPE__ is GNU-specific and available in GCC 4.6+ and Clang 3.0+.
* Fortunately, that is sufficient to support the few architectures for which
* sizeof(void *) != sizeof(size_t). The only other options would require C99
* or Clang-specific builtins.
*/
typedef __UINTPTR_TYPE__ JUINTPTR;
#else
typedef size_t JUINTPTR;
#endif
#define IsExtRGB(cs) \
(cs == JCS_RGB || (cs >= JCS_EXT_RGB && cs <= JCS_EXT_ARGB))
/*
* Left shift macro that handles a negative operand without causing any
* sanitizer warnings
*/
#define LEFT_SHIFT(a, b) ((JLONG)((unsigned long)(a) << (b)))
/* Declarations for compression modules */
/* Master control module */
struct jpeg_comp_master {
void (*prepare_for_pass) (j_compress_ptr cinfo);
void (*pass_startup) (j_compress_ptr cinfo);
void (*finish_pass) (j_compress_ptr cinfo);
/* State variables made visible to other modules */
boolean call_pass_startup; /* True if pass_startup must be called */
boolean is_last_pass; /* True during last pass */
boolean lossless; /* True if lossless mode is enabled */
};
/* Main buffer control (downsampled-data buffer) */
struct jpeg_c_main_controller {
void (*start_pass) (j_compress_ptr cinfo, J_BUF_MODE pass_mode);
void (*process_data) (j_compress_ptr cinfo, JSAMPARRAY input_buf,
JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail);
void (*process_data_12) (j_compress_ptr cinfo, J12SAMPARRAY input_buf,
JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail);
#ifdef C_LOSSLESS_SUPPORTED
void (*process_data_16) (j_compress_ptr cinfo, J16SAMPARRAY input_buf,
JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail);
#endif
};
/* Compression preprocessing (downsampling input buffer control) */
struct jpeg_c_prep_controller {
void (*start_pass) (j_compress_ptr cinfo, J_BUF_MODE pass_mode);
void (*pre_process_data) (j_compress_ptr cinfo, JSAMPARRAY input_buf,
JDIMENSION *in_row_ctr, JDIMENSION in_rows_avail,
JSAMPIMAGE output_buf,
JDIMENSION *out_row_group_ctr,
JDIMENSION out_row_groups_avail);
void (*pre_process_data_12) (j_compress_ptr cinfo, J12SAMPARRAY input_buf,
JDIMENSION *in_row_ctr,
JDIMENSION in_rows_avail,
J12SAMPIMAGE output_buf,
JDIMENSION *out_row_group_ctr,
JDIMENSION out_row_groups_avail);
#ifdef C_LOSSLESS_SUPPORTED
void (*pre_process_data_16) (j_compress_ptr cinfo, J16SAMPARRAY input_buf,
JDIMENSION *in_row_ctr,
JDIMENSION in_rows_avail,
J16SAMPIMAGE output_buf,
JDIMENSION *out_row_group_ctr,
JDIMENSION out_row_groups_avail);
#endif
};
/* Lossy mode: Coefficient buffer control
* Lossless mode: Difference buffer control
*/
struct jpeg_c_coef_controller {
void (*start_pass) (j_compress_ptr cinfo, J_BUF_MODE pass_mode);
boolean (*compress_data) (j_compress_ptr cinfo, JSAMPIMAGE input_buf);
boolean (*compress_data_12) (j_compress_ptr cinfo, J12SAMPIMAGE input_buf);
#ifdef C_LOSSLESS_SUPPORTED
boolean (*compress_data_16) (j_compress_ptr cinfo, J16SAMPIMAGE input_buf);
#endif
};
/* Colorspace conversion */
struct jpeg_color_converter {
void (*start_pass) (j_compress_ptr cinfo);
void (*color_convert) (j_compress_ptr cinfo, JSAMPARRAY input_buf,
JSAMPIMAGE output_buf, JDIMENSION output_row,
int num_rows);
void (*color_convert_12) (j_compress_ptr cinfo, J12SAMPARRAY input_buf,
J12SAMPIMAGE output_buf, JDIMENSION output_row,
int num_rows);
#ifdef C_LOSSLESS_SUPPORTED
void (*color_convert_16) (j_compress_ptr cinfo, J16SAMPARRAY input_buf,
J16SAMPIMAGE output_buf, JDIMENSION output_row,
int num_rows);
#endif
};
/* Downsampling */
struct jpeg_downsampler {
void (*start_pass) (j_compress_ptr cinfo);
void (*downsample) (j_compress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION in_row_index, JSAMPIMAGE output_buf,
JDIMENSION out_row_group_index);
void (*downsample_12) (j_compress_ptr cinfo, J12SAMPIMAGE input_buf,
JDIMENSION in_row_index, J12SAMPIMAGE output_buf,
JDIMENSION out_row_group_index);
#ifdef C_LOSSLESS_SUPPORTED
void (*downsample_16) (j_compress_ptr cinfo, J16SAMPIMAGE input_buf,
JDIMENSION in_row_index, J16SAMPIMAGE output_buf,
JDIMENSION out_row_group_index);
#endif
boolean need_context_rows; /* TRUE if need rows above & below */
};
/* Lossy mode: Forward DCT (also controls coefficient quantization)
* Lossless mode: Prediction, sample differencing, and point transform
*/
struct jpeg_forward_dct {
void (*start_pass) (j_compress_ptr cinfo);
/* Lossy mode */
/* perhaps this should be an array??? */
void (*forward_DCT) (j_compress_ptr cinfo, jpeg_component_info *compptr,
JSAMPARRAY sample_data, JBLOCKROW coef_blocks,
JDIMENSION start_row, JDIMENSION start_col,
JDIMENSION num_blocks);
void (*forward_DCT_12) (j_compress_ptr cinfo, jpeg_component_info *compptr,
J12SAMPARRAY sample_data, JBLOCKROW coef_blocks,
JDIMENSION start_row, JDIMENSION start_col,
JDIMENSION num_blocks);
};
/* Entropy encoding */
struct jpeg_entropy_encoder {
void (*start_pass) (j_compress_ptr cinfo, boolean gather_statistics);
/* Lossy mode */
boolean (*encode_mcu) (j_compress_ptr cinfo, JBLOCKROW *MCU_data);
/* Lossless mode */
JDIMENSION (*encode_mcus) (j_compress_ptr cinfo, JDIFFIMAGE diff_buf,
JDIMENSION MCU_row_num, JDIMENSION MCU_col_num,
JDIMENSION nMCU);
void (*finish_pass) (j_compress_ptr cinfo);
};
/* Marker writing */
struct jpeg_marker_writer {
void (*write_file_header) (j_compress_ptr cinfo);
void (*write_frame_header) (j_compress_ptr cinfo);
void (*write_scan_header) (j_compress_ptr cinfo);
void (*write_file_trailer) (j_compress_ptr cinfo);
void (*write_tables_only) (j_compress_ptr cinfo);
/* These routines are exported to allow insertion of extra markers */
/* Probably only COM and APPn markers should be written this way */
void (*write_marker_header) (j_compress_ptr cinfo, int marker,
unsigned int datalen);
void (*write_marker_byte) (j_compress_ptr cinfo, int val);
};
/* Declarations for decompression modules */
/* Master control module */
struct jpeg_decomp_master {
void (*prepare_for_output_pass) (j_decompress_ptr cinfo);
void (*finish_output_pass) (j_decompress_ptr cinfo);
/* State variables made visible to other modules */
boolean is_dummy_pass; /* True during 1st pass for 2-pass quant */
boolean lossless; /* True if decompressing a lossless image */
/* Partial decompression variables */
JDIMENSION first_iMCU_col;
JDIMENSION last_iMCU_col;
JDIMENSION first_MCU_col[MAX_COMPONENTS];
JDIMENSION last_MCU_col[MAX_COMPONENTS];
boolean jinit_upsampler_no_alloc;
/* Last iMCU row that was successfully decoded */
JDIMENSION last_good_iMCU_row;
};
/* Input control module */
struct jpeg_input_controller {
int (*consume_input) (j_decompress_ptr cinfo);
void (*reset_input_controller) (j_decompress_ptr cinfo);
void (*start_input_pass) (j_decompress_ptr cinfo);
void (*finish_input_pass) (j_decompress_ptr cinfo);
/* State variables made visible to other modules */
boolean has_multiple_scans; /* True if file has multiple scans */
boolean eoi_reached; /* True when EOI has been consumed */
};
/* Main buffer control (downsampled-data buffer) */
struct jpeg_d_main_controller {
void (*start_pass) (j_decompress_ptr cinfo, J_BUF_MODE pass_mode);
void (*process_data) (j_decompress_ptr cinfo, JSAMPARRAY output_buf,
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail);
void (*process_data_12) (j_decompress_ptr cinfo, J12SAMPARRAY output_buf,
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail);
#ifdef D_LOSSLESS_SUPPORTED
void (*process_data_16) (j_decompress_ptr cinfo, J16SAMPARRAY output_buf,
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail);
#endif
};
/* Lossy mode: Coefficient buffer control
* Lossless mode: Difference buffer control
*/
struct jpeg_d_coef_controller {
void (*start_input_pass) (j_decompress_ptr cinfo);
int (*consume_data) (j_decompress_ptr cinfo);
void (*start_output_pass) (j_decompress_ptr cinfo);
int (*decompress_data) (j_decompress_ptr cinfo, JSAMPIMAGE output_buf);
int (*decompress_data_12) (j_decompress_ptr cinfo, J12SAMPIMAGE output_buf);
#ifdef D_LOSSLESS_SUPPORTED
int (*decompress_data_16) (j_decompress_ptr cinfo, J16SAMPIMAGE output_buf);
#endif
/* These variables keep track of the current location of the input side. */
/* cinfo->input_iMCU_row is also used for this. */
JDIMENSION MCU_ctr; /* counts MCUs processed in current row */
int MCU_vert_offset; /* counts MCU rows within iMCU row */
int MCU_rows_per_iMCU_row; /* number of such rows needed */
/* The output side's location is represented by cinfo->output_iMCU_row. */
/* Lossy mode */
/* Pointer to array of coefficient virtual arrays, or NULL if none */
jvirt_barray_ptr *coef_arrays;
};
/* Decompression postprocessing (color quantization buffer control) */
struct jpeg_d_post_controller {
void (*start_pass) (j_decompress_ptr cinfo, J_BUF_MODE pass_mode);
void (*post_process_data) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION *in_row_group_ctr,
JDIMENSION in_row_groups_avail,
JSAMPARRAY output_buf, JDIMENSION *out_row_ctr,
JDIMENSION out_rows_avail);
void (*post_process_data_12) (j_decompress_ptr cinfo, J12SAMPIMAGE input_buf,
JDIMENSION *in_row_group_ctr,
JDIMENSION in_row_groups_avail,
J12SAMPARRAY output_buf,
JDIMENSION *out_row_ctr,
JDIMENSION out_rows_avail);
#ifdef D_LOSSLESS_SUPPORTED
void (*post_process_data_16) (j_decompress_ptr cinfo, J16SAMPIMAGE input_buf,
JDIMENSION *in_row_group_ctr,
JDIMENSION in_row_groups_avail,
J16SAMPARRAY output_buf,
JDIMENSION *out_row_ctr,
JDIMENSION out_rows_avail);
#endif
};
/* Marker reading & parsing */
struct jpeg_marker_reader {
void (*reset_marker_reader) (j_decompress_ptr cinfo);
/* Read markers until SOS or EOI.
* Returns same codes as are defined for jpeg_consume_input:
* JPEG_SUSPENDED, JPEG_REACHED_SOS, or JPEG_REACHED_EOI.
*/
int (*read_markers) (j_decompress_ptr cinfo);
/* Read a restart marker --- exported for use by entropy decoder only */
jpeg_marker_parser_method read_restart_marker;
/* State of marker reader --- nominally internal, but applications
* supplying COM or APPn handlers might like to know the state.
*/
boolean saw_SOI; /* found SOI? */
boolean saw_SOF; /* found SOF? */
int next_restart_num; /* next restart number expected (0-7) */
unsigned int discarded_bytes; /* # of bytes skipped looking for a marker */
};
/* Entropy decoding */
struct jpeg_entropy_decoder {
void (*start_pass) (j_decompress_ptr cinfo);
/* Lossy mode */
boolean (*decode_mcu) (j_decompress_ptr cinfo, JBLOCKROW *MCU_data);
/* Lossless mode */
JDIMENSION (*decode_mcus) (j_decompress_ptr cinfo, JDIFFIMAGE diff_buf,
JDIMENSION MCU_row_num, JDIMENSION MCU_col_num,
JDIMENSION nMCU);
boolean (*process_restart) (j_decompress_ptr cinfo);
/* This is here to share code between baseline and progressive decoders; */
/* other modules probably should not use it */
boolean insufficient_data; /* set TRUE after emitting warning */
};
/* Lossy mode: Inverse DCT (also performs dequantization)
* Lossless mode: Prediction, sample undifferencing, point transform, and
* sample size scaling
*/
typedef void (*inverse_DCT_method_ptr) (j_decompress_ptr cinfo,
jpeg_component_info *compptr,
JCOEFPTR coef_block,
JSAMPARRAY output_buf,
JDIMENSION output_col);
typedef void (*inverse_DCT_12_method_ptr) (j_decompress_ptr cinfo,
jpeg_component_info *compptr,
JCOEFPTR coef_block,
J12SAMPARRAY output_buf,
JDIMENSION output_col);
struct jpeg_inverse_dct {
void (*start_pass) (j_decompress_ptr cinfo);
/* Lossy mode */
/* It is useful to allow each component to have a separate IDCT method. */
inverse_DCT_method_ptr inverse_DCT[MAX_COMPONENTS];
inverse_DCT_12_method_ptr inverse_DCT_12[MAX_COMPONENTS];
};
/* Upsampling (note that upsampler must also call color converter) */
struct jpeg_upsampler {
void (*start_pass) (j_decompress_ptr cinfo);
void (*upsample) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION *in_row_group_ctr,
JDIMENSION in_row_groups_avail, JSAMPARRAY output_buf,
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail);
void (*upsample_12) (j_decompress_ptr cinfo, J12SAMPIMAGE input_buf,
JDIMENSION *in_row_group_ctr,
JDIMENSION in_row_groups_avail, J12SAMPARRAY output_buf,
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail);
#ifdef D_LOSSLESS_SUPPORTED
void (*upsample_16) (j_decompress_ptr cinfo, J16SAMPIMAGE input_buf,
JDIMENSION *in_row_group_ctr,
JDIMENSION in_row_groups_avail, J16SAMPARRAY output_buf,
JDIMENSION *out_row_ctr, JDIMENSION out_rows_avail);
#endif
boolean need_context_rows; /* TRUE if need rows above & below */
};
/* Colorspace conversion */
struct jpeg_color_deconverter {
void (*start_pass) (j_decompress_ptr cinfo);
void (*color_convert) (j_decompress_ptr cinfo, JSAMPIMAGE input_buf,
JDIMENSION input_row, JSAMPARRAY output_buf,
int num_rows);
void (*color_convert_12) (j_decompress_ptr cinfo, J12SAMPIMAGE input_buf,
JDIMENSION input_row, J12SAMPARRAY output_buf,
int num_rows);
#ifdef D_LOSSLESS_SUPPORTED
void (*color_convert_16) (j_decompress_ptr cinfo, J16SAMPIMAGE input_buf,
JDIMENSION input_row, J16SAMPARRAY output_buf,
int num_rows);
#endif
};
/* Color quantization or color precision reduction */
struct jpeg_color_quantizer {
void (*start_pass) (j_decompress_ptr cinfo, boolean is_pre_scan);
void (*color_quantize) (j_decompress_ptr cinfo, JSAMPARRAY input_buf,
JSAMPARRAY output_buf, int num_rows);
void (*color_quantize_12) (j_decompress_ptr cinfo, J12SAMPARRAY input_buf,
J12SAMPARRAY output_buf, int num_rows);
void (*finish_pass) (j_decompress_ptr cinfo);
void (*new_color_map) (j_decompress_ptr cinfo);
};
/* Miscellaneous useful macros */
#undef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#undef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
/* We assume that right shift corresponds to signed division by 2 with
* rounding towards minus infinity. This is correct for typical "arithmetic
* shift" instructions that shift in copies of the sign bit. But some
* C compilers implement >> with an unsigned shift. For these machines you
* must define RIGHT_SHIFT_IS_UNSIGNED.
* RIGHT_SHIFT provides a proper signed right shift of a JLONG quantity.
* It is only applied with constant shift counts. SHIFT_TEMPS must be
* included in the variables of any routine using RIGHT_SHIFT.
*/
#ifdef RIGHT_SHIFT_IS_UNSIGNED
#define SHIFT_TEMPS JLONG shift_temp;
#define RIGHT_SHIFT(x, shft) \
((shift_temp = (x)) < 0 ? \
(shift_temp >> (shft)) | ((~((JLONG)0)) << (32 - (shft))) : \
(shift_temp >> (shft)))
#else
#define SHIFT_TEMPS
#define RIGHT_SHIFT(x, shft) ((x) >> (shft))
#endif
/* Compression module initialization routines */
EXTERN(void) jinit_compress_master(j_compress_ptr cinfo);
EXTERN(void) jinit_c_master_control(j_compress_ptr cinfo,
boolean transcode_only);
EXTERN(void) jinit_c_main_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j12init_c_main_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) jinit_c_prep_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j12init_c_prep_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) jinit_c_coef_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j12init_c_coef_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) jinit_color_converter(j_compress_ptr cinfo);
EXTERN(void) j12init_color_converter(j_compress_ptr cinfo);
EXTERN(void) jinit_downsampler(j_compress_ptr cinfo);
EXTERN(void) j12init_downsampler(j_compress_ptr cinfo);
EXTERN(void) jinit_forward_dct(j_compress_ptr cinfo);
EXTERN(void) j12init_forward_dct(j_compress_ptr cinfo);
EXTERN(void) jinit_huff_encoder(j_compress_ptr cinfo);
EXTERN(void) jinit_phuff_encoder(j_compress_ptr cinfo);
EXTERN(void) jinit_arith_encoder(j_compress_ptr cinfo);
EXTERN(void) jinit_marker_writer(j_compress_ptr cinfo);
#ifdef C_LOSSLESS_SUPPORTED
EXTERN(void) j16init_c_main_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j16init_c_prep_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j16init_color_converter(j_compress_ptr cinfo);
EXTERN(void) j16init_downsampler(j_compress_ptr cinfo);
EXTERN(void) jinit_c_diff_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j12init_c_diff_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j16init_c_diff_controller(j_compress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) jinit_lhuff_encoder(j_compress_ptr cinfo);
EXTERN(void) jinit_lossless_compressor(j_compress_ptr cinfo);
EXTERN(void) j12init_lossless_compressor(j_compress_ptr cinfo);
EXTERN(void) j16init_lossless_compressor(j_compress_ptr cinfo);
#endif
/* Decompression module initialization routines */
EXTERN(void) jinit_master_decompress(j_decompress_ptr cinfo);
EXTERN(void) jinit_d_main_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j12init_d_main_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) jinit_d_coef_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j12init_d_coef_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) jinit_d_post_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j12init_d_post_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) jinit_input_controller(j_decompress_ptr cinfo);
EXTERN(void) jinit_marker_reader(j_decompress_ptr cinfo);
EXTERN(void) jinit_huff_decoder(j_decompress_ptr cinfo);
EXTERN(void) jinit_phuff_decoder(j_decompress_ptr cinfo);
EXTERN(void) jinit_arith_decoder(j_decompress_ptr cinfo);
EXTERN(void) jinit_inverse_dct(j_decompress_ptr cinfo);
EXTERN(void) j12init_inverse_dct(j_decompress_ptr cinfo);
EXTERN(void) jinit_upsampler(j_decompress_ptr cinfo);
EXTERN(void) j12init_upsampler(j_decompress_ptr cinfo);
EXTERN(void) jinit_color_deconverter(j_decompress_ptr cinfo);
EXTERN(void) j12init_color_deconverter(j_decompress_ptr cinfo);
EXTERN(void) jinit_1pass_quantizer(j_decompress_ptr cinfo);
EXTERN(void) j12init_1pass_quantizer(j_decompress_ptr cinfo);
EXTERN(void) jinit_2pass_quantizer(j_decompress_ptr cinfo);
EXTERN(void) j12init_2pass_quantizer(j_decompress_ptr cinfo);
EXTERN(void) jinit_merged_upsampler(j_decompress_ptr cinfo);
EXTERN(void) j12init_merged_upsampler(j_decompress_ptr cinfo);
#ifdef D_LOSSLESS_SUPPORTED
EXTERN(void) j16init_d_main_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j16init_d_post_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j16init_upsampler(j_decompress_ptr cinfo);
EXTERN(void) j16init_color_deconverter(j_decompress_ptr cinfo);
EXTERN(void) jinit_d_diff_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j12init_d_diff_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) j16init_d_diff_controller(j_decompress_ptr cinfo,
boolean need_full_buffer);
EXTERN(void) jinit_lhuff_decoder(j_decompress_ptr cinfo);
EXTERN(void) jinit_lossless_decompressor(j_decompress_ptr cinfo);
EXTERN(void) j12init_lossless_decompressor(j_decompress_ptr cinfo);
EXTERN(void) j16init_lossless_decompressor(j_decompress_ptr cinfo);
#endif
/* Memory manager initialization */
EXTERN(void) jinit_memory_mgr(j_common_ptr cinfo);
/* Utility routines in jutils.c */
EXTERN(long) jdiv_round_up(long a, long b);
EXTERN(long) jround_up(long a, long b);
EXTERN(void) jcopy_sample_rows(JSAMPARRAY input_array, int source_row,
JSAMPARRAY output_array, int dest_row,
int num_rows, JDIMENSION num_cols);
EXTERN(void) j12copy_sample_rows(J12SAMPARRAY input_array, int source_row,
J12SAMPARRAY output_array, int dest_row,
int num_rows, JDIMENSION num_cols);
#if defined(C_LOSSLESS_SUPPORTED) || defined(D_LOSSLESS_SUPPORTED)
EXTERN(void) j16copy_sample_rows(J16SAMPARRAY input_array, int source_row,
J16SAMPARRAY output_array, int dest_row,
int num_rows, JDIMENSION num_cols);
#endif
EXTERN(void) jcopy_block_row(JBLOCKROW input_row, JBLOCKROW output_row,
JDIMENSION num_blocks);
EXTERN(void) jzero_far(void *target, size_t bytestozero);
/* Constant tables in jutils.c */
#if 0 /* This table is not actually needed in v6a */
extern const int jpeg_zigzag_order[]; /* natural coef order to zigzag order */
#endif
extern const int jpeg_natural_order[]; /* zigzag coef order to natural order */
/* Arithmetic coding probability estimation tables in jaricom.c */
extern const JLONG jpeg_aritab[];