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jdhuff.h File Reference

Go to the source code of this file.

Classes

struct  d_derived_tbl
 
struct  bitread_perm_state
 
struct  bitread_working_state
 

Macros

#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, JHUFF_TBL *htbl, d_derived_tbl **pdtbl))
 
EXTERN boolean jpeg_fill_bit_buffer JPP ((bitread_working_state *state, register bit_buf_type get_buffer, register int bits_left, int nbits))
 
EXTERN int jpeg_huff_decode JPP ((bitread_working_state *state, register bit_buf_type get_buffer, register int bits_left, d_derived_tbl *htbl, int min_bits))
 

Macro Definition Documentation

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

Definition at line 69 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; \
br_state.unread_marker = cinfop->unread_marker; \
get_buffer = permstate.get_buffer; \
bits_left = permstate.bits_left; \
br_state.printed_eod_ptr = & permstate.printed_eod

Definition at line 105 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; \
cinfop->unread_marker = br_state.unread_marker; \
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
INT32 bit_buf_type
Definition: jdhuff.h:68

Definition at line 100 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; } }
GLOBAL boolean jpeg_fill_bit_buffer(bitread_working_state *state, register bit_buf_type get_buffer, register int bits_left, int nbits)
Definition: jdhuff.c:234
if(!ValidDisplayID(prefInfo.prefDisplayID)) prefInfo.prefDisplayID

Definition at line 139 of file jdhuff.h.

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

Definition at line 151 of file jdhuff.h.

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

Definition at line 145 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; \
} \
} \
if ((nb = htbl->look_nbits[look]) != 0) { \
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; \
} \
}
#define DROP_BITS(nbits)
Definition: jdhuff.h:151
GLOBAL int 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: jdhuff.c:322
Boolean result
#define PEEK_BITS(nbits)
Definition: jdhuff.h:148
#define HUFF_LOOKAHEAD
Definition: jdhuff.h:24
GLOBAL boolean jpeg_fill_bit_buffer(bitread_working_state *state, register bit_buf_type get_buffer, register int bits_left, int nbits)
Definition: jdhuff.c:234
if(!ValidDisplayID(prefInfo.prefDisplayID)) prefInfo.prefDisplayID

Definition at line 177 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 148 of file jdhuff.h.

Typedef Documentation

Definition at line 68 of file jdhuff.h.

Function Documentation

EXTERN boolean jpeg_fill_bit_buffer JPP ( (bitread_working_state *state, register bit_buf_type get_buffer, register int bits_left, int nbits)  )
EXTERN int jpeg_huff_decode JPP ( (bitread_working_state *state, register bit_buf_type get_buffer, register int bits_left, d_derived_tbl *htbl, int min_bits)  )