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- /* Copyright (C) 1994 Aladdin Enterprises. All rights reserved.
-
- This file is part of AFPL Ghostscript.
-
- AFPL Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author or
- distributor accepts any responsibility for the consequences of using it, or
- for whether it serves any particular purpose or works at all, unless he or
- she says so in writing. Refer to the Aladdin Free Public License (the
- "License") for full details.
-
- Every copy of AFPL Ghostscript must include a copy of the License, normally
- in a plain ASCII text file named PUBLIC. The License grants you the right
- to copy, modify and redistribute AFPL Ghostscript, but only under certain
- conditions described in the License. Among other things, the License
- requires that the copyright notice and this notice be preserved on all
- copies.
- */
-
- /*$Id: shcgen.h,v 1.2 2000/09/19 19:00:50 lpd Exp $ */
- /* Interface for Huffman code generation */
- /* Requires shc.h */
-
- #ifndef shcgen_INCLUDED
- # define shcgen_INCLUDED
-
- /* Compute an optimal Huffman code from an input data set. */
- /* The client must have set all the elements of *def. */
- /* The definition is guaranteed to be well-behaved. */
- int hc_compute(P3(hc_definition * def, const long *freqs, gs_memory_t * mem));
-
- /* Convert a definition to a byte string. */
- /* The caller must provide the byte string, of length def->num_values. */
- /* Assume (do not check) that the definition is well-behaved. */
- /* Return the actual length of the string. */
- int hc_bytes_from_definition(P2(byte * dbytes, const hc_definition * def));
-
- /* Extract num_counts and num_values from a byte string. */
- void hc_sizes_from_bytes(P3(hc_definition * def, const byte * dbytes, int num_bytes));
-
- /* Convert a byte string back to a definition. */
- /* The caller must initialize *def, including allocating counts and values. */
- void hc_definition_from_bytes(P2(hc_definition * def, const byte * dbytes));
-
- /* Generate the encoding table from the definition. */
- /* The size of the encode array is def->num_values. */
- void hc_make_encoding(P2(hce_code * encode, const hc_definition * def));
-
- /* Calculate the size of the decoding table. */
- uint hc_sizeof_decoding(P2(const hc_definition * def, int initial_bits));
-
- /* Generate the decoding tables. */
- void hc_make_decoding(P3(hcd_code * decode, const hc_definition * def,
- int initial_bits));
-
- #endif /* shcgen_INCLUDED */
-