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https://github.com/aaru-dps/Aaru.Compression.Native.git
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91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
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/***********************************************************************
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This file is part of HA, a general purpose file archiver.
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Copyright (C) 1995 Harri Hirvola
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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************************************************************************
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HA HSC method
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***********************************************************************/
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/***********************************************************************
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Modified to work with memory buffers instead of files by
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Copyright (C) 2005 Natalia Portillo
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************************************************************************/
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#ifndef HSC_H
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#define HSC_H
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#include "internal.h"
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int hsc_unpack(decompress_context_t *ctx);
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#define IECLIM 32
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#define NECLIM 5
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#define NECTLIM 4
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#define NECMAX 10
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#define MAXCLEN 4
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#define NUMCON 10000
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#define NUMCFB 32760
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#define ESCTH 3
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#define MAXTVAL 8000
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#define RFMINI 4
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#define HTLEN 16384
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#define NIL 0xffff
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#define ESC 256
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typedef unsigned char Context[4];
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/* Model data */
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static Context curcon;
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static U16B * ht = NULL;
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static U16B * hp = NULL;
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static Context * con = NULL;
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static unsigned char *cl = NULL;
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static unsigned char *cc = NULL;
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static U16B * ft = NULL;
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static unsigned char *fe = NULL;
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static U16B * elp = NULL;
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static U16B * eln = NULL;
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static U16B elf, ell;
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static unsigned char *rfm = NULL;
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static U16B * fa = NULL;
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static unsigned char *fc = NULL;
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static U16B * nb = NULL;
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static U16B fcfbl;
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static U16B nrel;
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/* Frequency mask system */
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static unsigned char cmask[256];
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static unsigned char cmstack[256];
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static S16B cmsp;
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/* Escape probability modifying system variables */
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static unsigned char nec;
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static unsigned char iec[MAXCLEN + 1];
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/* Update stack variables */
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static U16B usp;
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static U16B cps[MAXCLEN + 1];
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static U16B as[MAXCLEN + 1];
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/* Miscellaneous */
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static S16B dropcnt;
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static unsigned char maxclen;
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static U16B hrt[HTLEN];
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static U16B hs[MAXCLEN + 1];
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static S16B cslen;
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#endif /* HSC_H */
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