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1 : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 : /*************************************************************************
3 : *
4 : * The Contents of this file are made available subject to the terms of
5 : * either of the following licenses
6 : *
7 : * - GNU Lesser General Public License Version 2.1
8 : * - Sun Industry Standards Source License Version 1.1
9 : *
10 : * Sun Microsystems Inc., October, 2000
11 : *
12 : * GNU Lesser General Public License Version 2.1
13 : * =============================================
14 : * Copyright 2000 by Sun Microsystems, Inc.
15 : * 901 San Antonio Road, Palo Alto, CA 94303, USA
16 : *
17 : * This library is free software; you can redistribute it and/or
18 : * modify it under the terms of the GNU Lesser General Public
19 : * License version 2.1, as published by the Free Software Foundation.
20 : *
21 : * This library is distributed in the hope that it will be useful,
22 : * but WITHOUT ANY WARRANTY; without even the implied warranty of
23 : * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
24 : * Lesser General Public License for more details.
25 : *
26 : * You should have received a copy of the GNU Lesser General Public
27 : * License along with this library; if not, write to the Free Software
28 : * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
29 : * MA 02111-1307 USA
30 : *
31 : *
32 : * Sun Industry Standards Source License Version 1.1
33 : * =================================================
34 : * The contents of this file are subject to the Sun Industry Standards
35 : * Source License Version 1.1 (the "License"); You may not use this file
36 : * except in compliance with the License. You may obtain a copy of the
37 : * License at http://www.openoffice.org/license.html.
38 : *
39 : * Software provided under this License is provided on an "AS IS" basis,
40 : * WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING,
41 : * WITHOUT LIMITATION, WARRANTIES THAT THE SOFTWARE IS FREE OF DEFECTS,
42 : * MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE, OR NON-INFRINGING.
43 : * See the License for the specific provisions governing your rights and
44 : * obligations concerning the Software.
45 : *
46 : * The Initial Developer of the Original Code is: IBM Corporation
47 : *
48 : * Copyright: 2008 by IBM Corporation
49 : *
50 : * All Rights Reserved.
51 : *
52 : * Contributor(s): _______________________________________
53 : *
54 : *
55 : ************************************************************************/
56 : #ifndef _EXPLODE_HXX_
57 : #define _EXPLODE_HXX_
58 :
59 : #include <tools/stream.hxx>
60 :
61 : class HuffmanTreeNode
62 : {
63 : public:
64 : HuffmanTreeNode * left;
65 : HuffmanTreeNode * right;
66 : sal_uInt32 value;
67 :
68 : HuffmanTreeNode(sal_uInt32 value = 0xffffffff, HuffmanTreeNode * left = NULL, HuffmanTreeNode * right = NULL) ;
69 : ~HuffmanTreeNode() ;
70 : HuffmanTreeNode * InsertNode(sal_uInt32 nValue, const sal_Char * pInCode);
71 : HuffmanTreeNode * QueryNode(const sal_Char *pCode);
72 : sal_uInt32 QueryValue(const sal_Char *pCode);
73 : };
74 :
75 :
76 : /**
77 : * @brief
78 : * define the function type for input read, output write
79 : */
80 : #define CHUNK 16384
81 : #define MAXWIN 4096 /* maximum window size */
82 : class Decompression
83 : {
84 : public:
85 : Decompression(SvStream * pInStream, SvStream * pOutStream);
86 0 : ~Decompression()
87 : {
88 0 : delete m_Tree1;
89 0 : delete m_Tree2;
90 0 : };
91 : /**
92 : * @brief
93 : * decompress from instream to outstream
94 : */
95 : sal_Int32 explode();
96 : sal_uInt32 ReadBits(sal_uInt16 iCount, sal_uInt32 & nBits) ;
97 : sal_uInt32 Decode(HuffmanTreeNode * pRoot);
98 :
99 : /**
100 : * @brief
101 : * compressed/decompressed stream
102 : */
103 : SvStream *m_pInStream;
104 : SvStream *m_pOutStream;
105 :
106 : sal_uInt32 m_nCurrent4Byte; // bit buffer
107 : sal_uInt32 m_nBitsLeft; // number of bits remained in bit buffer
108 :
109 : sal_uInt8 m_Buffer[CHUNK]; // input byte buffer
110 : sal_uInt8 *m_pBuffer; // pointer to input buffer
111 : sal_uInt32 m_nBytesLeft; // number of bytes remained in byte buffer
112 :
113 : sal_uInt8 m_Output[MAXWIN]; // output byte buffer
114 : sal_uInt32 m_nOutputBufferPos; // pointer to output buffer
115 :
116 : sal_uInt32 m_iArrayOfM[16];
117 :
118 :
119 : HuffmanTreeNode *m_Tree1, *m_Tree2;
120 :
121 : void ConstructTree1();
122 : void ConstructTree2();
123 : void fillArray();
124 : void ToString(sal_uInt32 nBits, sal_Char *pChar, sal_uInt32 nLen);
125 : };
126 : #endif
127 :
128 : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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