Source code of Windows XP (NT5)
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/*
* jchuff.h * * Copyright (C) 1991-1995, Thomas G. Lane. * This file is part of the Independent JPEG Group's software. * For conditions of distribution and use, see the accompanying README file. * * This file contains declarations for Huffman entropy encoding routines * that are shared between the sequential encoder (jchuff.c) and the * progressive encoder (jcphuff.c). No other modules need to see these. */
/* Derived data constructed for each Huffman table */
typedef struct { unsigned int ehufco[256]; /* code for each symbol */ char ehufsi[256]; /* length of code for each symbol */ /* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */} c_derived_tbl;
/* Short forms of external names for systems with brain-damaged linkers. */
#ifdef NEED_SHORT_EXTERNAL_NAMES
#define jpeg_make_c_derived_tbl jMkCDerived
#define jpeg_gen_optimal_table jGenOptTbl
#endif /* NEED_SHORT_EXTERNAL_NAMES */
/* Expand a Huffman table definition into the derived format */EXTERN void jpeg_make_c_derived_tbl JPP((j_compress_ptr cinfo, JHUFF_TBL * htbl, c_derived_tbl ** pdtbl));
/* Generate an optimal table definition given the specified counts */EXTERN void jpeg_gen_optimal_table JPP((j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[]));
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