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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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