+++ /dev/null
-/* huff.h
- Copyright (C) 2008, Gonzalo Navarro, all rights reserved.
-
- Canonical Huffman
-
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Lesser General Public
- License as published by the Free Software Foundation; either
- version 2.1 of the License, or (at your option) any later version.
-
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public
- License along with this library; if not, write to the Free Software
- Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
-
-*/
-
-#ifndef HUFFINCLUDED
-#define HUFFINCLUDED
-
-#include <basics.h>
-
-typedef struct
- { uint max,lim; // maximum symbol (0..max), same excluding zero freqs
- uint depth; // max symbol length
- union
- { uint *spos; // symbol positions after sorting by decr freq (enc)
- uint *symb; // symbols sorted by freq (dec)
- } s;
- uint *num; // first pos of each length (dec), number of each length (enc)
- uint *fst; // first code (numeric) of each length (dec)
- ulong total; // total length to achieve, in bits
- } THuff;
-
-
-/** Creates Huffman encoder given symbols 0..lim with frequencies
- * freq[i], ready for compression
- *
- * @author Gonzalo Navarro
- */
-THuff createHuff (uint *freq, uint lim);
-
-/** Encodes symb using H, over stream[ptr...lim] (ptr and lim are
- * bit positions of stream). Returns the new ptr.
- *
- * @author Gonzalo Navarro
- */
-ulong encodeHuff (THuff H, uint symb, uint *stream, ulong ptr);
-
-/** Decodes *symb using H, over stream[ptr...lim] (ptr and lim are
- * bit positions of stream). Returns the new ptr.
- *
- * @author Gonzalo Navarro
- */
-ulong decodeHuff (THuff H, uint *symb, uint *stream, ulong ptr);
-
-/** Writes H in file f
- *
- * @author Gonzalo Navarro
- */
-void saveHuff (THuff H, FILE *f);
-
-/** Size of H written on file
- *
- * @author Gonzalo Navarro
- */
-uint sizeHuff (THuff H);
-
-/** Frees H
- *
- * @author Gonzalo Navarro
- */
-void freeHuff (THuff H);
-
-/** Loads H from file f, prepared for encoding or decoding depending
- * on enc
- *
- * @author Gonzalo Navarro
- */
-THuff loadHuff (FILE *f, int enc);
-
-#endif