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1 office 1 /* bitswap.c
2 * Table of bit-swapped values of bytes
3 *
4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
7 *
8 *
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License
11 * as published by the Free Software Foundation; either version 2
12 * of the License, or (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
22 */
23  
24 #include "config.h"
25  
26 #include <glib.h>
27  
28 #include "bitswap.h"
29  
30 /* "swaptab[i]" is the value of "i" with the bits reversed. */
31 static const guint8 swaptab[256] =
32 {
33 0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0,
34 0x10, 0x90, 0x50, 0xd0, 0x30, 0xb0, 0x70, 0xf0,
35 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8,
36 0x18, 0x98, 0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8,
37 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64, 0xe4,
38 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4,
39 0x0c, 0x8c, 0x4c, 0xcc, 0x2c, 0xac, 0x6c, 0xec,
40 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc,
41 0x02, 0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2,
42 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2, 0x72, 0xf2,
43 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea,
44 0x1a, 0x9a, 0x5a, 0xda, 0x3a, 0xba, 0x7a, 0xfa,
45 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
46 0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6,
47 0x0e, 0x8e, 0x4e, 0xce, 0x2e, 0xae, 0x6e, 0xee,
48 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe,
49 0x01, 0x81, 0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1,
50 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71, 0xf1,
51 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9,
52 0x19, 0x99, 0x59, 0xd9, 0x39, 0xb9, 0x79, 0xf9,
53 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5,
54 0x15, 0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5,
55 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad, 0x6d, 0xed,
56 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd,
57 0x03, 0x83, 0x43, 0xc3, 0x23, 0xa3, 0x63, 0xe3,
58 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
59 0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb,
60 0x1b, 0x9b, 0x5b, 0xdb, 0x3b, 0xbb, 0x7b, 0xfb,
61 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7,
62 0x17, 0x97, 0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7,
63 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f, 0xef,
64 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff,
65 };
66  
67 void bitswap_buf_inplace(guint8 *buf, size_t len)
68 {
69 size_t i;
70  
71 for (i = 0; i < len; i++)
72 buf[i] = swaptab[buf[i]];
73 }
74  
75 /*
76 * Editor modelines - http://www.wireshark.org/tools/modelines.html
77 *
78 * Local Variables:
79 * c-basic-offset: 2
80 * tab-width: 8
81 * indent-tabs-mode: nil
82 * End:
83 *
84 * ex: set shiftwidth=2 tabstop=8 expandtab:
85 * :indentSize=2:tabSize=8:noTabs=true:
86 */