jdhuff.c File Reference

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

Go to the source code of this file.

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

Typedefs
typedef huff_entropy_decoder *	huff_entropy_ptr

Functions
	start_pass_huff_decoder (j_decompress_ptr cinfo)
	jpeg_make_d_derived_tbl (j_decompress_ptr cinfo, boolean isDC, int tblno, d_derived_tbl **pdtbl)
	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)
	process_restart (j_decompress_ptr cinfo)
	decode_mcu (j_decompress_ptr cinfo, JBLOCKROW *MCU_data)
	jinit_huff_decoder (j_decompress_ptr cinfo)

Macro Definition Documentation

ASSIGN_STATE

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

Definition at line 40 of file jdhuff.c.

Referenced by decode_mcu().

HUFF_EXTEND

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

Definition at line 447 of file jdhuff.c.

Referenced by decode_mcu().

JPEG_INTERNALS

#define JPEG_INTERNALS

Definition at line 17 of file jdhuff.c.

MIN_GET_BITS

#define MIN_GET_BITS   (BIT_BUF_SIZE-7)

Definition at line 287 of file jdhuff.c.

Referenced by jpeg_fill_bit_buffer().

Typedef Documentation

huff_entropy_ptr

typedef huff_entropy_decoder* huff_entropy_ptr

Definition at line 78 of file jdhuff.c.

Function Documentation

decode_mcu()

decode_mcu	(	j_decompress_ptr	cinfo,
		JBLOCKROW *	MCU_data
	)

Definition at line 517 of file jdhuff.c.

References ASSIGN_STATE, BITREAD_LOAD_STATE, BITREAD_SAVE_STATE, BITREAD_STATE_VARS, CHECK_BIT_BUFFER, DCTSIZE2, DROP_BITS, FALSE, GET_BITS, GLOBAL, HUFF_DECODE, HUFF_EXTEND, if(), jpeg_natural_order, process_restart(), and TRUE.

Referenced by jinit_huff_decoder().

jinit_huff_decoder()

jinit_huff_decoder

(

j_decompress_ptr

cinfo

)

Definition at line 635 of file jdhuff.c.

References decode_mcu(), i, JPOOL_IMAGE, NULL, NUM_HUFF_TBLS, SIZEOF, and start_pass_huff_decoder().

Referenced by master_selection(), and transdecode_master_selection().

jpeg_fill_bit_buffer()

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

Definition at line 292 of file jdhuff.c.

References bits_left, jpeg_source_mgr::bytes_in_buffer, jpeg_decompress_struct::entropy, FALSE, get_buffer, GETJOCTET, GLOBAL, 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()

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

Definition at line 398 of file jdhuff.c.

References bits_left, CHECK_BIT_BUFFER, code, GET_BITS, get_buffer, JHUFF_TBL::huffval, int, min_bits, and WARNMS.

jpeg_make_d_derived_tbl()

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

Definition at line 149 of file jdhuff.c.

References JHUFF_TBL::bits, code, ERREXIT, ERREXIT1, htbl, HUFF_LOOKAHEAD, JHUFF_TBL::huffval, i, if(), int, isDC, 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 start_pass_huff_decoder().

process_restart()

process_restart

(

j_decompress_ptr

cinfo

)

Definition at line 468 of file jdhuff.c.

References FALSE, if(), METHODDEF, and TRUE.

Referenced by decode_mcu().

start_pass_huff_decoder()

start_pass_huff_decoder

(

j_decompress_ptr

cinfo

)

Definition at line 86 of file jdhuff.c.

References jpeg_component_info::ac_tbl_no, jpeg_component_info::component_needed, compptr, jpeg_component_info::dc_tbl_no, jpeg_component_info::DCT_scaled_size, DCTSIZE2, FALSE, GLOBAL, if(), jpeg_make_d_derived_tbl(), TRUE, and WARNMS.

Referenced by jinit_huff_decoder().