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