bsp
|
00001 /* 00002 * jchuff.h 00003 * 00004 * Copyright (C) 1991-1995, Thomas G. Lane. 00005 * This file is part of the Independent JPEG Group's software. 00006 * For conditions of distribution and use, see the accompanying README file. 00007 * 00008 * This file contains declarations for Huffman entropy encoding routines 00009 * that are shared between the sequential encoder (jchuff.c) and the 00010 * progressive encoder (jcphuff.c). No other modules need to see these. 00011 */ 00012 00013 /* Derived data constructed for each Huffman table */ 00014 00015 typedef struct 00016 { 00017 unsigned int ehufco[256]; /* code for each symbol */ 00018 char ehufsi[256]; /* length of code for each symbol */ 00019 /* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */ 00020 } c_derived_tbl; 00021 00022 /* Short forms of external names for systems with brain-damaged linkers. */ 00023 00024 #ifdef NEED_SHORT_EXTERNAL_NAMES 00025 #define jpeg_make_c_derived_tbl jMkCDerived 00026 #define jpeg_gen_optimal_table jGenOptTbl 00027 #endif /* NEED_SHORT_EXTERNAL_NAMES */ 00028 00029 /* Expand a Huffman table definition into the derived format */ 00030 EXTERN void jpeg_make_c_derived_tbl JPP((j_compress_ptr cinfo, 00031 JHUFF_TBL * htbl, c_derived_tbl ** pdtbl)); 00032 00033 /* Generate an optimal table definition given the specified counts */ 00034 EXTERN void jpeg_gen_optimal_table JPP((j_compress_ptr cinfo, 00035 JHUFF_TBL * htbl, long freq[]));