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jdhuff.h File Reference

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Data Structures

struct  d_derived_tbl
struct  bitread_perm_state
struct  bitread_working_state

Defines

#define HUFF_LOOKAHEAD   8 /* # of bits of lookahead */
#define BIT_BUF_SIZE   32 /* size of buffer in bits */
#define BITREAD_STATE_VARS
#define BITREAD_LOAD_STATE(cinfop, permstate)
#define BITREAD_SAVE_STATE(cinfop, permstate)
#define CHECK_BIT_BUFFER(state, nbits, action)
#define GET_BITS(nbits)   (((int) (get_buffer >> (bits_left -= (nbits)))) & ((1<<(nbits))-1))
#define PEEK_BITS(nbits)   (((int) (get_buffer >> (bits_left - (nbits)))) & ((1<<(nbits))-1))
#define DROP_BITS(nbits)   (bits_left -= (nbits))
#define HUFF_DECODE(result, state, htbl, failaction, slowlabel)

Typedefs

typedef INT32 bit_buf_type

Functions

 EXTERN (void) jpeg_make_d_derived_tbl JPP((j_decompress_ptr cinfo
 EXTERN (boolean) jpeg_fill_bit_buffer JPP((bitread_working_state *state
 EXTERN (int) jpeg_huff_decode JPP((bitread_working_state *state

Variables

boolean isDC
boolean int tblno
boolean int d_derived_tbl ** pdtbl
register bit_buf_type get_buffer
register bit_buf_type register
int 
bits_left
register bit_buf_type register
int int 
nbits
register bit_buf_type register
int d_derived_tbl
htbl
register bit_buf_type register
int d_derived_tbl int 
min_bits


Define Documentation

#define BIT_BUF_SIZE   32 /* size of buffer in bits */
 

Definition at line 73 of file jdhuff.h.

#define BITREAD_LOAD_STATE cinfop,
permstate   ) 
 

Value:

br_state.cinfo = cinfop; \ br_state.next_input_byte = cinfop->src->next_input_byte; \ br_state.bytes_in_buffer = cinfop->src->bytes_in_buffer; \ get_buffer = permstate.get_buffer; \ bits_left = permstate.bits_left;

Definition at line 107 of file jdhuff.h.

#define BITREAD_SAVE_STATE cinfop,
permstate   ) 
 

Value:

cinfop->src->next_input_byte = br_state.next_input_byte; \ cinfop->src->bytes_in_buffer = br_state.bytes_in_buffer; \ permstate.get_buffer = get_buffer; \ permstate.bits_left = bits_left

Definition at line 114 of file jdhuff.h.

#define BITREAD_STATE_VARS
 

Value:

register bit_buf_type get_buffer; \ register int bits_left; \ bitread_working_state br_state

Definition at line 102 of file jdhuff.h.

#define CHECK_BIT_BUFFER state,
nbits,
action   ) 
 

Value:

{ if (bits_left < (nbits)) { \ if (! jpeg_fill_bit_buffer(&(state),get_buffer,bits_left,nbits)) \ { action; } \ get_buffer = (state).get_buffer; bits_left = (state).bits_left; } }

Definition at line 138 of file jdhuff.h.

#define DROP_BITS nbits   )     (bits_left -= (nbits))
 

Definition at line 150 of file jdhuff.h.

#define GET_BITS nbits   )     (((int) (get_buffer >> (bits_left -= (nbits)))) & ((1<<(nbits))-1))
 

Definition at line 144 of file jdhuff.h.

#define HUFF_DECODE result,
state,
htbl,
failaction,
slowlabel   ) 
 

Value:

{ register int nb, look; \ if (bits_left < HUFF_LOOKAHEAD) { \ if (! jpeg_fill_bit_buffer(&state,get_buffer,bits_left, 0)) {failaction;} \ get_buffer = state.get_buffer; bits_left = state.bits_left; \ if (bits_left < HUFF_LOOKAHEAD) { \ nb = 1; goto slowlabel; \ } \ } \ look = PEEK_BITS(HUFF_LOOKAHEAD); \ if ((nb = htbl->look_nbits[look]) != 0) { \ DROP_BITS(nb); \ result = htbl->look_sym[look]; \ } else { \ nb = HUFF_LOOKAHEAD+1; \ slowlabel: \ if ((result=jpeg_huff_decode(&state,get_buffer,bits_left,htbl,nb)) < 0) \ { failaction; } \ get_buffer = state.get_buffer; bits_left = state.bits_left; \ } \ }

Definition at line 176 of file jdhuff.h.

#define HUFF_LOOKAHEAD   8 /* # of bits of lookahead */
 

Definition at line 24 of file jdhuff.h.

#define PEEK_BITS nbits   )     (((int) (get_buffer >> (bits_left - (nbits)))) & ((1<<(nbits))-1))
 

Definition at line 147 of file jdhuff.h.


Typedef Documentation

typedef INT32 bit_buf_type
 

Definition at line 72 of file jdhuff.h.


Function Documentation

EXTERN int   ) 
 

EXTERN boolean   ) 
 

EXTERN void   ) 
 


Variable Documentation

register bit_buf_type register int bits_left
 

Definition at line 200 of file jdhuff.h.

register bit_buf_type get_buffer
 

Definition at line 200 of file jdhuff.h.

register bit_buf_type register int d_derived_tbl* htbl
 

Definition at line 200 of file jdhuff.h.

boolean isDC
 

Definition at line 50 of file jdhuff.h.

register bit_buf_type register int d_derived_tbl int min_bits
 

Definition at line 200 of file jdhuff.h.

register bit_buf_type register int int nbits
 

Definition at line 155 of file jdhuff.h.

boolean int d_derived_tbl** pdtbl
 

Definition at line 50 of file jdhuff.h.

boolean int tblno
 

Definition at line 50 of file jdhuff.h.


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