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/* -*- c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* ====================================================================
* Copyright (c) 2009 Carnegie Mellon University. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* This work was supported in part by funding from the Defense Advanced
* Research Projects Agency and the National Science Foundation of the
* United States of America, and the CMU Sphinx Speech Consortium.
*
* THIS SOFTWARE IS PROVIDED BY CARNEGIE MELLON UNIVERSITY ``AS IS'' AND
* ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL CARNEGIE MELLON UNIVERSITY
* NOR ITS EMPLOYEES BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* ====================================================================
*
*/
/**
* @file huff_code.h
* @brief Huffman code and bitstream implementation
*
* This interface supports building canonical Huffman codes from
* string and integer values. It also provides support for encoding
* and decoding from strings and files, and for reading and writing
* codebooks from files.
*/
#ifndef __HUFF_CODE_H__
#define __HUFF_CODE_H__
#include <stdio.h>
#include <sphinxbase/sphinxbase_export.h>
#include <sphinxbase/prim_type.h>
#include <sphinxbase/cmd_ln.h>
typedef struct huff_code_s huff_code_t;
/**
* Create a codebook from 32-bit integer data.
*/
SPHINXBASE_EXPORT
huff_code_t *huff_code_build_int(int32 const *values, int32 const *frequencies, int nvals);
/**
* Create a codebook from string data.
*/
SPHINXBASE_EXPORT
huff_code_t *huff_code_build_str(char * const *values, int32 const *frequencies, int nvals);
/**
* Read a codebook from a file.
*/
SPHINXBASE_EXPORT
huff_code_t *huff_code_read(FILE *infh);
/**
* Write a codebook to a file.
*/
SPHINXBASE_EXPORT
int huff_code_write(huff_code_t *hc, FILE *outfh);
/**
* Print a codebook to a file as text (for debugging)
*/
SPHINXBASE_EXPORT
int huff_code_dump(huff_code_t *hc, FILE *dumpfh);
/**
* Retain a pointer to a Huffman codec object.
*/
SPHINXBASE_EXPORT
huff_code_t *huff_code_retain(huff_code_t *hc);
/**
* Release a pointer to a Huffman codec object.
*/
SPHINXBASE_EXPORT
int huff_code_free(huff_code_t *hc);
/**
* Attach a Huffman codec to a file handle for input/output.
*/
SPHINXBASE_EXPORT
FILE *huff_code_attach(huff_code_t *hc, FILE *fh, char const *mode);
/**
* Detach a Huffman codec from its file handle.
*/
SPHINXBASE_EXPORT
FILE *huff_code_detach(huff_code_t *hc);
/**
* Encode an integer, writing it to the file handle, if any.
*/
SPHINXBASE_EXPORT
int huff_code_encode_int(huff_code_t *hc, int32 sym, uint32 *outcw);
/**
* Encode a string, writing it to the file handle, if any.
*/
SPHINXBASE_EXPORT
int huff_code_encode_str(huff_code_t *hc, char const *sym, uint32 *outcw);
/**
* Decode an integer, reading it from the file if no data given.
*/
SPHINXBASE_EXPORT
int huff_code_decode_int(huff_code_t *hc, int *outval,
char const **inout_data,
size_t *inout_data_len,
int *inout_offset);
/**
* Decode a string, reading it from the file if no data given.
*/
SPHINXBASE_EXPORT
char const *huff_code_decode_str(huff_code_t *hc,
char const **inout_data,
size_t *inout_data_len,
int *inout_offset);
#endif /* __HUFF_CODE_H__ */
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