libnfc  1.7.0-rc7
mirror-subr.c
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1 /*-
2  * Free/Libre Near Field Communication (NFC) library
3  *
4  * Libnfc historical contributors:
5  * Copyright (C) 2009 Roel Verdult
6  * Copyright (C) 2009-2013 Romuald Conty
7  * Copyright (C) 2010-2012 Romain Tartière
8  * Copyright (C) 2010-2013 Philippe Teuwen
9  * Copyright (C) 2012-2013 Ludovic Rousseau
10  * Additional contributors of this file:
11  *
12  * This program is free software: you can redistribute it and/or modify it
13  * under the terms of the GNU Lesser General Public License as published by the
14  * Free Software Foundation, either version 3 of the License, or (at your
15  * option) any later version.
16  *
17  * This program is distributed in the hope that it will be useful, but WITHOUT
18  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
19  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
20  * more details.
21  *
22  * You should have received a copy of the GNU Lesser General Public License
23  * along with this program. If not, see <http://www.gnu.org/licenses/>
24  */
25 
31 #ifdef HAVE_CONFIG_H
32 # include "config.h"
33 #endif // HAVE_CONFIG_H
34 
35 #include <stdio.h>
36 
37 #include "mirror-subr.h"
38 
39 static const uint8_t ByteMirror[256] = {
40  0x00, 0x80, 0x40, 0xc0, 0x20, 0xa0, 0x60, 0xe0, 0x10, 0x90, 0x50, 0xd0, 0x30,
41  0xb0, 0x70, 0xf0, 0x08, 0x88, 0x48, 0xc8, 0x28, 0xa8, 0x68, 0xe8, 0x18, 0x98,
42  0x58, 0xd8, 0x38, 0xb8, 0x78, 0xf8, 0x04, 0x84, 0x44, 0xc4, 0x24, 0xa4, 0x64,
43  0xe4, 0x14, 0x94, 0x54, 0xd4, 0x34, 0xb4, 0x74, 0xf4, 0x0c, 0x8c, 0x4c, 0xcc,
44  0x2c, 0xac, 0x6c, 0xec, 0x1c, 0x9c, 0x5c, 0xdc, 0x3c, 0xbc, 0x7c, 0xfc, 0x02,
45  0x82, 0x42, 0xc2, 0x22, 0xa2, 0x62, 0xe2, 0x12, 0x92, 0x52, 0xd2, 0x32, 0xb2,
46  0x72, 0xf2, 0x0a, 0x8a, 0x4a, 0xca, 0x2a, 0xaa, 0x6a, 0xea, 0x1a, 0x9a, 0x5a,
47  0xda, 0x3a, 0xba, 0x7a, 0xfa, 0x06, 0x86, 0x46, 0xc6, 0x26, 0xa6, 0x66, 0xe6,
48  0x16, 0x96, 0x56, 0xd6, 0x36, 0xb6, 0x76, 0xf6, 0x0e, 0x8e, 0x4e, 0xce, 0x2e,
49  0xae, 0x6e, 0xee, 0x1e, 0x9e, 0x5e, 0xde, 0x3e, 0xbe, 0x7e, 0xfe, 0x01, 0x81,
50  0x41, 0xc1, 0x21, 0xa1, 0x61, 0xe1, 0x11, 0x91, 0x51, 0xd1, 0x31, 0xb1, 0x71,
51  0xf1, 0x09, 0x89, 0x49, 0xc9, 0x29, 0xa9, 0x69, 0xe9, 0x19, 0x99, 0x59, 0xd9,
52  0x39, 0xb9, 0x79, 0xf9, 0x05, 0x85, 0x45, 0xc5, 0x25, 0xa5, 0x65, 0xe5, 0x15,
53  0x95, 0x55, 0xd5, 0x35, 0xb5, 0x75, 0xf5, 0x0d, 0x8d, 0x4d, 0xcd, 0x2d, 0xad,
54  0x6d, 0xed, 0x1d, 0x9d, 0x5d, 0xdd, 0x3d, 0xbd, 0x7d, 0xfd, 0x03, 0x83, 0x43,
55  0xc3, 0x23, 0xa3, 0x63, 0xe3, 0x13, 0x93, 0x53, 0xd3, 0x33, 0xb3, 0x73, 0xf3,
56  0x0b, 0x8b, 0x4b, 0xcb, 0x2b, 0xab, 0x6b, 0xeb, 0x1b, 0x9b, 0x5b, 0xdb, 0x3b,
57  0xbb, 0x7b, 0xfb, 0x07, 0x87, 0x47, 0xc7, 0x27, 0xa7, 0x67, 0xe7, 0x17, 0x97,
58  0x57, 0xd7, 0x37, 0xb7, 0x77, 0xf7, 0x0f, 0x8f, 0x4f, 0xcf, 0x2f, 0xaf, 0x6f,
59  0xef, 0x1f, 0x9f, 0x5f, 0xdf, 0x3f, 0xbf, 0x7f, 0xff
60 };
61 
62 uint8_t
63 mirror(uint8_t bt)
64 {
65  return ByteMirror[bt];
66 }
67 
68 static void
69 mirror_bytes(uint8_t *pbts, size_t szLen)
70 {
71  size_t szByteNr;
72 
73  for (szByteNr = 0; szByteNr < szLen; szByteNr++) {
74  *pbts = ByteMirror[*pbts];
75  pbts++;
76  }
77 }
78 
79 uint32_t
80 mirror32(uint32_t ui32Bits)
81 {
82  mirror_bytes((uint8_t *) & ui32Bits, 4);
83  return ui32Bits;
84 }
85 
86 uint64_t
87 mirror64(uint64_t ui64Bits)
88 {
89  mirror_bytes((uint8_t *) & ui64Bits, 8);
90  return ui64Bits;
91 }