source: trunk/indexers/mg/lib/bitio_stdio.h@ 3745

Last change on this file since 3745 was 3745, checked in by mdewsnip, 21 years ago

Addition of MG package for search and retrieval
  • Property svn:executable set to *
  • Property svn:keywords set to Author Date Id Revision
File size: 3.3 KB
Line 
1/**************************************************************************
2 *
3 * bitio_stdio.h -- Functions for bitio to a file
4 * Copyright (C) 1994 Neil Sharman
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
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 *
20 * $Id: bitio_stdio.h 3745 2003-02-20 21:20:24Z mdewsnip $
21 *
22 **************************************************************************
23 *
24 * This file contains function definitions for doing bitwise input and output
25 * of number on a FILE*. With these function you cannot mix reads and writes
26 * on the FILE, or multiple writes, at the same time and guarantee them to
27 * work, also you cannot seek to a point and do a write. The decode function
28 * can detect when you run off the end of the file and will produce an
29 * approate error message.
30 *
31 *
32 **************************************************************************/
33
34#ifndef H_BITIO_STDIO
35#define H_BITIO_STDIO
36
37
38typedef struct stdio_bitio_state
39 {
40 FILE *File;
41 unsigned char Buff;
42 unsigned char Btg;
43 }
44stdio_bitio_state;
45
46
47/* NOTE : All bytes are filled high bit first */
48
49
50void BIO_Stdio_Encode_Start (FILE * f, stdio_bitio_state * bs);
51void BIO_Stdio_Encode_Done (stdio_bitio_state * bs);
52
53
54
55void BIO_Stdio_Decode_Start (FILE * f, stdio_bitio_state * bs);
56
57
58
59void BIO_Stdio_Encode_Bit (int bit, stdio_bitio_state * bs);
60int BIO_Stdio_Decode_Bit (stdio_bitio_state * bs);
61
62
63void BIO_Stdio_Unary_Encode (unsigned long val, stdio_bitio_state * bs,
64 unsigned long *bits);
65unsigned long BIO_Stdio_Unary_Decode (stdio_bitio_state * bs,
66 unsigned long *bits);
67
68
69
70void BIO_Stdio_Binary_Encode (unsigned long val, unsigned long b,
71 stdio_bitio_state * bs, unsigned long *bits);
72unsigned long BIO_Stdio_Binary_Decode (unsigned long b, stdio_bitio_state * bs,
73 unsigned long *bits);
74
75
76
77void BIO_Stdio_Gamma_Encode (unsigned long val, stdio_bitio_state * bs,
78 unsigned long *bits);
79unsigned long BIO_Stdio_Gamma_Decode (stdio_bitio_state * bs,
80 unsigned long *bits);
81
82
83
84void BIO_Stdio_Delta_Encode (unsigned long val, stdio_bitio_state * bs,
85 unsigned long *bits);
86unsigned long BIO_Stdio_Delta_Decode (stdio_bitio_state * bs,
87 unsigned long *bits);
88
89
90
91void BIO_Stdio_Elias_Encode (unsigned long val, unsigned long b, double s,
92 stdio_bitio_state * bs, unsigned long *bits);
93unsigned long BIO_Stdio_Elias_Decode (unsigned long b, double s,
94 stdio_bitio_state * bs,
95 unsigned long *bits);
96
97
98void BIO_Stdio_Bblock_Encode (unsigned long val, unsigned long b,
99 stdio_bitio_state * bs, unsigned long *bits);
100unsigned long BIO_Stdio_Bblock_Decode (unsigned long b, stdio_bitio_state * bs,
101 unsigned long *bits);
102
103
104void BIO_Stdio_Decode_Seek (unsigned long pos, stdio_bitio_state * bs);
105
106#endif
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