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git://git.code.sf.net/p/cdesktopenv/code
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115 lines
3.3 KiB
C++
115 lines
3.3 KiB
C++
/*
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* CDE - Common Desktop Environment
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*
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* Copyright (c) 1993-2012, The Open Group. All rights reserved.
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*
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* These libraries and programs are free software; you can
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* redistribute them and/or modify them under the terms of the GNU
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* Lesser General Public License as published by the Free Software
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* Foundation; either version 2 of the License, or (at your option)
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* any later version.
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*
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* These libraries and programs are distributed in the hope that
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* they will be useful, but WITHOUT ANY WARRANTY; without even the
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* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU Lesser General Public License for more
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* details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with these libraries and programs; if not, write
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* to the Free Software Foundation, Inc., 51 Franklin Street, Fifth
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* Floor, Boston, MA 02110-1301 USA
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*/
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/*
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* $XConsortium: huffman.h /main/3 1996/06/11 17:15:11 cde-hal $
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*
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* Copyright (c) 1993 HAL Computer Systems International, Ltd.
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* All rights reserved. Unpublished -- rights reserved under
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* the Copyright Laws of the United States. USE OF A COPYRIGHT
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* NOTICE IS PRECAUTIONARY ONLY AND DOES NOT IMPLY PUBLICATION
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* OR DISCLOSURE.
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*
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* THIS SOFTWARE CONTAINS CONFIDENTIAL INFORMATION AND TRADE
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* SECRETS OF HAL COMPUTER SYSTEMS INTERNATIONAL, LTD. USE,
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* DISCLOSURE, OR REPRODUCTION IS PROHIBITED WITHOUT THE
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* PRIOR EXPRESS WRITTEN PERMISSION OF HAL COMPUTER SYSTEMS
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* INTERNATIONAL, LTD.
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*
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* RESTRICTED RIGHTS LEGEND
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* Use, duplication, or disclosure by the Government is subject
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* to the restrictions as set forth in subparagraph (c)(l)(ii)
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* of the Rights in Technical Data and Computer Software clause
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* at DFARS 252.227-7013.
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*
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* HAL COMPUTER SYSTEMS INTERNATIONAL, LTD.
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* 1315 Dell Avenue
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* Campbell, CA 95008
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*
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*/
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#ifndef _huff_h
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#define _huff_h 1
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#include "compression/abs_agent.h"
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#include "compression/trie.h"
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////////////////////////////////////////
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//
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////////////////////////////////////////
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class htr_node
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{
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public:
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htr_node* left;
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htr_node* right;
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encoding_unit* eu;
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unsigned long freq;
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htr_node* parent;
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public:
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htr_node(encoding_unit* eu, htr_node* lt = 0, htr_node* rt = 0);
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htr_node(unsigned long freq, htr_node* lt = 0, htr_node* rt = 0);
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~htr_node();
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};
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////////////////////////////////////////
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//
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////////////////////////////////////////
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class huff : public compress_agent
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{
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protected:
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encoding_unit** e_units;
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unsigned int cts ;
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trie* tri;
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htr_node* htr_root;
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protected:
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void build_tree();
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void calculate_code();
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encoding_unit* get_e_unit(unsigned char*& data, int len);
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public:
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huff();
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virtual ~huff() ;
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virtual void compress(const buffer& uncompressed, buffer& compressed) ;
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virtual void decompress(buffer& compressed, buffer& uncompressed) ;
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ostream& print_alphabet(ostream& out);
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MMDB_SIGNATURES(huff);
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// compacted disk representation In and Out functions
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virtual int cdr_sizeof();
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virtual io_status cdrOut(buffer&);
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virtual io_status cdrIn(buffer&);
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// get data to compute the alphabet
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virtual io_status build_dict(lex_func_t f_lex, getchar_func_t f_getchar);
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};
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extern huff g_huff_agent;
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#endif
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