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Member "qdiff-0.9.1/trotfile.h" (21 Oct 2008, 2321 Bytes) of package /linux/privat/old/qdiff-0.9.1.tar.gz:
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1 /*GPL*START*
2 *
3 * Copyright (C) 1998 by Johannes Overmann <overmann@iname.com>
4 * Copyright (C) 2008 by Tong Sun <suntong001@users.sourceforge.net>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
19 * *GPL*END*/
20
21 #ifndef _trotfile_h_
22 #define _trotfile_h_
23
24 #include "terror.h"
25 #include "ttypes.h"
26 #include "tstring.h"
27
28 class TROTFile {
29 public:
30 // ctor & dtor
31 TROTFile(const char *fname, int numbuf, int bufsize);
32 ~TROTFile();
33
34 // readonly access
35 uchar operator[] (int i);
36 int size() const {return _size;}
37 const char *name() const {return fname.data();};
38
39 private:
40 // internal buffer
41 int numbuf; // number of buffer
42 int bufsize; // size of buffer
43 int bufbits; // bits of buffer size
44 int bufmask; // address mask for buffer (in)
45 int nummask; // address mask for buffer (which)
46 int offmask; // address mask for offset
47 int *off; // offset of buffer
48 uchar **buf; // buffer
49
50 // real file
51 int _size; // size of file
52 tstring fname; // filename
53 FILE *file; // open file
54
55 // private methods
56 void loadBuf(int offset, int buffer);
57 int intLog2(int i) const;
58 bool isPowerOf2(int i) const;
59
60 // forbid copy
61 TROTFile(const TROTFile& a);
62 const TROTFile& operator=(const TROTFile& a);
63 };
64
65 inline uchar TROTFile::operator[] (int i) {
66 if(((uint)i) < ((uint)_size)) {
67 int offset = i&offmask;
68 int buffer = (i >> bufbits) & nummask;
69 if(offset!=off[buffer]) loadBuf(offset, buffer);
70 return buf[buffer][i & bufmask];
71 } else
72 fatalError("operator[]: index out of range! (%d not in [0..%d])\n",
73 i, _size-1);
74 }
75
76 #endif
77
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