106 lines
3.6 KiB
C
106 lines
3.6 KiB
C
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* Copyright by The HDF Group. *
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* Copyright by the Board of Trustees of the University of Illinois. *
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* All rights reserved. *
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* *
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* This file is part of HDF. The full HDF copyright notice, including *
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* terms governing use, modification, and redistribution, is contained in *
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* the COPYING file, which can be found at the root of the source code *
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* distribution tree, or in https://support.hdfgroup.org/ftp/HDF/releases/. *
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* If you do not have access to either file, you may request a copy from *
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* help@hdfgroup.org. *
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* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
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/* $Id$ */
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/*-----------------------------------------------------------------------------
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* File: cskphuff.h
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* Purpose: Header file for skipping huffman encoding information.
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* Dependencies: should only be included from hcompi.h
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* Invokes: none
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* Contents: Structures & definitions for skipping huffman encoding.
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* Structure definitions:
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* Constant definitions:
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*---------------------------------------------------------------------------*/
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/* avoid re-inclusion */
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#ifndef __CSKPHUFF_H
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#define __CSKPHUFF_H
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#if defined c_plusplus || defined __cplusplus
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extern "C"
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{
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#endif /* c_plusplus || __cplusplus */
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/*
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** from cskphuff.c
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*/
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HDFLIBAPI int32 HCPcskphuff_stread
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(accrec_t * rec);
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HDFLIBAPI int32 HCPcskphuff_stwrite
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(accrec_t * rec);
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HDFLIBAPI int32 HCPcskphuff_seek
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(accrec_t * access_rec, int32 offset, int origin);
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HDFLIBAPI int32 HCPcskphuff_inquire
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(accrec_t * access_rec, int32 *pfile_id, uint16 *ptag, uint16 *pref,
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int32 *plength, int32 *poffset, int32 *pposn, int16 *paccess,
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int16 *pspecial);
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HDFLIBAPI int32 HCPcskphuff_read
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(accrec_t * access_rec, int32 length, void * data);
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HDFLIBAPI int32 HCPcskphuff_write
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(accrec_t * access_rec, int32 length, const void * data);
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HDFLIBAPI intn HCPcskphuff_endaccess
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(accrec_t * access_rec);
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#if defined c_plusplus || defined __cplusplus
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}
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#endif /* c_plusplus || __cplusplus */
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/* The maximum source character code: */
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#define SKPHUFF_MAX_CHAR 255
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/* One greater than the maximum source character code: */
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#define SUCCMAX (SKPHUFF_MAX_CHAR+1)
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/* Twice the maximum source character code: */
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#define TWICEMAX (2*SUCCMAX+1)
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/* The root node in the tree */
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#define ROOT 0
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/* Skipping huffman [en|de]coding information */
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typedef struct
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{
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intn skip_size; /* number of bytes in each element */
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uintn **left, /* define the left and right pointer arrays */
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**right;
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uint8 **up; /* define the up pointer array */
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intn skip_pos; /* current byte to read or write */
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int32 offset; /* offset in the de-compressed array */
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}
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comp_coder_skphuff_info_t;
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#ifndef CSKPHUFF_MASTER
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extern funclist_t cskphuff_funcs; /* functions to perform skipping huffman encoding */
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#else
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funclist_t cskphuff_funcs =
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{ /* functions to perform skipping huffman encoding */
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HCPcskphuff_stread,
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HCPcskphuff_stwrite,
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HCPcskphuff_seek,
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HCPcskphuff_inquire,
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HCPcskphuff_read,
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HCPcskphuff_write,
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HCPcskphuff_endaccess
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};
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#endif
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#endif /* __CSKPHUFF_H */
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