12  * This file contains Huffman entropy decoding routines.
33  * Expanded entropy decoder object for Huffman decoding.
79   huff_entropy_ptr entropy = (huff_entropy_ptr)cinfo->entropy;  in start_pass_huff_decoder()  local
98     pdtbl = (d_derived_tbl **)(entropy->dc_derived_tbls) + dctbl;  in start_pass_huff_decoder()
100     pdtbl = (d_derived_tbl **)(entropy->ac_derived_tbls) + actbl;  in start_pass_huff_decoder()
103     entropy->saved.last_dc_val[ci] = 0;  in start_pass_huff_decoder()
111     entropy->dc_cur_tbls[blkn] = entropy->dc_derived_tbls[compptr->dc_tbl_no];  in start_pass_huff_decoder()
112     entropy->ac_cur_tbls[blkn] = entropy->ac_derived_tbls[compptr->ac_tbl_no];  in start_pass_huff_decoder()
115       entropy->dc_needed[blkn] = TRUE;  in start_pass_huff_decoder()
117       entropy->ac_needed[blkn] = (compptr->_DCT_scaled_size > 1);  in start_pass_huff_decoder()
119       entropy->dc_needed[blkn] = entropy->ac_needed[blkn] = FALSE;  in start_pass_huff_decoder()
124   entropy->bitstate.bits_left = 0;  in start_pass_huff_decoder()
125   entropy->bitstate.get_buffer = 0; /* unnecessary, but keeps Purify quiet */  in start_pass_huff_decoder()
126   entropy->pub.insufficient_data = FALSE;  in start_pass_huff_decoder()
129   entropy->restarts_to_go = cinfo->restart_interval;  in start_pass_huff_decoder()
365       if (!cinfo->entropy->insufficient_data) {  in jpeg_fill_bit_buffer()
367         cinfo->entropy->insufficient_data = TRUE;  in jpeg_fill_bit_buffer()
512   huff_entropy_ptr entropy = (huff_entropy_ptr)cinfo->entropy;  in process_restart()  local
517   cinfo->marker->discarded_bytes += entropy->bitstate.bits_left / 8;  in process_restart()
518   entropy->bitstate.bits_left = 0;  in process_restart()
526     entropy->saved.last_dc_val[ci] = 0;  in process_restart()
529   entropy->restarts_to_go = cinfo->restart_interval;  in process_restart()
537     entropy->pub.insufficient_data = FALSE;  in process_restart()
552   huff_entropy_ptr entropy = (huff_entropy_ptr)cinfo->entropy;  in decode_mcu_slow()  local
559   BITREAD_LOAD_STATE(cinfo, entropy->bitstate);  in decode_mcu_slow()
560   state = entropy->saved;  in decode_mcu_slow()
564     d_derived_tbl *dctbl = entropy->dc_cur_tbls[blkn];  in decode_mcu_slow()
565     d_derived_tbl *actbl = entropy->ac_cur_tbls[blkn];  in decode_mcu_slow()
578     if (entropy->dc_needed[blkn]) {  in decode_mcu_slow()
597     if (entropy->ac_needed[blkn] && block) {  in decode_mcu_slow()
648   BITREAD_SAVE_STATE(cinfo, entropy->bitstate);  in decode_mcu_slow()
649   entropy->saved = state;  in decode_mcu_slow()
663   huff_entropy_ptr entropy = (huff_entropy_ptr)cinfo->entropy;  in decode_mcu_fast()  local
671   BITREAD_LOAD_STATE(cinfo, entropy->bitstate);  in decode_mcu_fast()
673   state = entropy->saved;  in decode_mcu_fast()
677     d_derived_tbl *dctbl = entropy->dc_cur_tbls[blkn];  in decode_mcu_fast()
678     d_derived_tbl *actbl = entropy->ac_cur_tbls[blkn];  in decode_mcu_fast()
688     if (entropy->dc_needed[blkn]) {  in decode_mcu_fast()
699     if (entropy->ac_needed[blkn] && block) {  in decode_mcu_fast()
744   BITREAD_SAVE_STATE(cinfo, entropy->bitstate);  in decode_mcu_fast()
745   entropy->saved = state;  in decode_mcu_fast()
770   huff_entropy_ptr entropy = (huff_entropy_ptr)cinfo->entropy;  in decode_mcu()  local
775     if (entropy->restarts_to_go == 0)  in decode_mcu()
788   if (!entropy->pub.insufficient_data) {  in decode_mcu()
801     entropy->restarts_to_go--;  in decode_mcu()
808  * Module initialization routine for Huffman entropy decoding.
814   huff_entropy_ptr entropy;  in jinit_huff_decoder()  local
823   entropy = (huff_entropy_ptr)  in jinit_huff_decoder()
826   cinfo->entropy = (struct jpeg_entropy_decoder *)entropy;  in jinit_huff_decoder()
827   entropy->pub.start_pass = start_pass_huff_decoder;  in jinit_huff_decoder()
828   entropy->pub.decode_mcu = decode_mcu;  in jinit_huff_decoder()
832     entropy->dc_derived_tbls[i] = entropy->ac_derived_tbls[i] = NULL;  in jinit_huff_decoder()