jdhuff.c File Reference

#include "jinclude.h"
#include "jpeglib.h"
#include "jdhuff.h"

Data Structures
struct	huff_entropy_decoder
struct	savable_state

Macros
#define	ASSIGN_STATE(dest, src)   ((dest) = (src))
#define	HUFF_EXTEND(x, s)   ((x) < extend_test[s] ? (x) + extend_offset[s] : (x))
#define	JPEG_INTERNALS
#define	MIN_GET_BITS   (BIT_BUF_SIZE-7)

Typedefs
typedef huff_entropy_decoder *	huff_entropy_ptr

Functions
	decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
	jinit_huff_decoder (j_decompress_ptr cinfo)
	jpeg_fill_bit_buffer (bitread_working_state *state, register bit_buf_type get_buffer, register int bits_left, int nbits)
	jpeg_huff_decode (bitread_working_state *state, register bit_buf_type get_buffer, register int bits_left, d_derived_tbl *htbl, int min_bits)
	jpeg_make_d_derived_tbl (j_decompress_ptr cinfo, boolean isDC, int tblno, d_derived_tbl **pdtbl)
	process_restart (j_decompress_ptr cinfo)
	start_pass_huff_decoder (j_decompress_ptr cinfo)

Variables
static const int	extend_offset [16]
static const int	extend_test [16]

#define ASSIGN_STATE	(		dest,
			src
	)		((dest) = (src))

Referenced by decode_mcu().

#define HUFF_EXTEND	(		x,
			s
	)		((x) < extend_test[s] ? (x) + extend_offset[s] : (x))

Referenced by decode_mcu().

#define JPEG_INTERNALS

#define MIN_GET_BITS   (BIT_BUF_SIZE-7)

Referenced by jpeg_fill_bit_buffer().

typedef huff_entropy_decoder* huff_entropy_ptr

decode_mcu	(	j_decompress_ptr	cinfo,
		JBLOCKROW *	MCU_data
	)

References ASSIGN_STATE, BITREAD_LOAD_STATE, BITREAD_SAVE_STATE, BITREAD_STATE_VARS, CHECK_BIT_BUFFER, ci, DCTSIZE2, DROP_BITS, FALSE, GET_BITS, HUFF_DECODE, HUFF_EXTEND, if(), jpeg_natural_order, process_restart(), huff_entropy_encoder::pub, huff_entropy_encoder::restarts_to_go, s, huff_entropy_encoder::saved, state, and TRUE.

Referenced by jinit_huff_decoder().

jinit_huff_decoder

(

j_decompress_ptr

cinfo

)

References huff_entropy_encoder::ac_derived_tbls, huff_entropy_encoder::dc_derived_tbls, decode_mcu(), i, JPOOL_IMAGE, NULL, NUM_HUFF_TBLS, huff_entropy_encoder::pub, SIZEOF, and start_pass_huff_decoder().

Referenced by master_selection(), and transdecode_master_selection().

jpeg_fill_bit_buffer	(	bitread_working_state *	state,
		register bit_buf_type	get_buffer,
		register int	bits_left,
		int	nbits
	)

References bits_left, jpeg_source_mgr::bytes_in_buffer, c, cinfo, jpeg_decompress_struct::entropy, FALSE, get_buffer, GETJOCTET, jpeg_entropy_decoder::insufficient_data, MIN_GET_BITS, jpeg_source_mgr::next_input_byte, jpeg_decompress_struct::src, TRUE, jpeg_decompress_struct::unread_marker, and WARNMS.

jpeg_huff_decode	(	bitread_working_state *	state,
		register bit_buf_type	get_buffer,
		register int	bits_left,
		d_derived_tbl *	htbl,
		int	min_bits
	)

References bits_left, CHECK_BIT_BUFFER, GET_BITS, get_buffer, min_bits, and WARNMS.

jpeg_make_d_derived_tbl	(	j_decompress_ptr	cinfo,
		boolean	isDC,
		int	tblno,
		d_derived_tbl **	pdtbl
	)

References JHUFF_TBL::bits, ERREXIT, ERREXIT1, htbl, HUFF_LOOKAHEAD, JHUFF_TBL::huffval, i, if(), JPOOL_IMAGE, d_derived_tbl::look_nbits, d_derived_tbl::look_sym, d_derived_tbl::maxcode, MEMZERO, NULL, NUM_HUFF_TBLS, pdtbl, d_derived_tbl::pub, SIZEOF, tblno, and d_derived_tbl::valoffset.

Referenced by METHODDEF(), and start_pass_huff_decoder().

process_restart

(

j_decompress_ptr

cinfo

)

References ci, cinfo, FALSE, if(), savable_state::last_dc_val, huff_entropy_encoder::pub, huff_entropy_encoder::restarts_to_go, huff_entropy_encoder::saved, and TRUE.

Referenced by decode_mcu(), decode_mcu_AC_first(), decode_mcu_AC_refine(), decode_mcu_DC_first(), and decode_mcu_DC_refine().

start_pass_huff_decoder

(

j_decompress_ptr

cinfo

)

References huff_entropy_encoder::ac_derived_tbls, jpeg_component_info::ac_tbl_no, ci, jpeg_component_info::component_needed, compptr, huff_entropy_encoder::dc_derived_tbls, jpeg_component_info::dc_tbl_no, jpeg_component_info::DCT_scaled_size, DCTSIZE2, FALSE, if(), jpeg_make_d_derived_tbl(), savable_state::last_dc_val, huff_entropy_encoder::pub, huff_entropy_encoder::restarts_to_go, huff_entropy_encoder::saved, TRUE, and WARNMS.

Referenced by jinit_huff_decoder().

const int extend_offset[16]

static

Initial value:

= 
  { 0, ((-1)<<1) + 1, ((-1)<<2) + 1, ((-1)<<3) + 1, ((-1)<<4) + 1,
    ((-1)<<5) + 1, ((-1)<<6) + 1, ((-1)<<7) + 1, ((-1)<<8) + 1,
    ((-1)<<9) + 1, ((-1)<<10) + 1, ((-1)<<11) + 1, ((-1)<<12) + 1,
    ((-1)<<13) + 1, ((-1)<<14) + 1, ((-1)<<15) + 1 }

const int extend_test[16]

static

Initial value:

=   
  { 0, 0x0001, 0x0002, 0x0004, 0x0008, 0x0010, 0x0020, 0x0040, 0x0080,
    0x0100, 0x0200, 0x0400, 0x0800, 0x1000, 0x2000, 0x4000 }