source: roaraudio/libroar/crc.c @ 5823:f9f70dbaa376

Last change on this file since 5823:f9f70dbaa376 was 5823:f9f70dbaa376, checked in by phi, 11 years ago

updated copyright

File size: 3.5 KB
Line 
1//crc.c:
2
3/*
4 *      Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2013
5 *
6 *  This file is part of libroar a part of RoarAudio,
7 *  a cross-platform sound system for both, home and professional use.
8 *  See README for details.
9 *
10 *  This file is free software; you can redistribute it and/or modify
11 *  it under the terms of the GNU General Public License version 3
12 *  as published by the Free Software Foundation.
13 *
14 *  libroar 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 software; see the file COPYING.  If not, write to
21 *  the Free Software Foundation, 51 Franklin Street, Fifth Floor,
22 *  Boston, MA 02110-1301, USA.
23 *
24 *  NOTE for everyone want's to change something and send patches:
25 *  read README and HACKING! There a addition information on
26 *  the license of this document you need to read before you send
27 *  any patches.
28 *
29 *  NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc
30 *  or libpulse*:
31 *  The libs libroaresd, libroararts and libroarpulse link this lib
32 *  and are therefore GPL. Because of this it may be illigal to use
33 *  them with any software that uses libesd, libartsc or libpulse*.
34 */
35
36#include "libroar.h"
37
38#define CRC24_POLY 0x01864CFBL
39#define CRC24_INIT 0x00B704CEL
40
41#define ADLER32_BASE 65521L
42#define ADLER32_INIT 1L
43
44uint32_t roar_crc24_add(uint32_t state, const void * data, size_t len) {
45 const unsigned char * p = data;
46 int i;
47
48 if ( data == NULL )
49  return CRC24_INIT;
50
51 for (; len; len--) {
52  state ^= ((uint32_t)(*p++)) << 16;
53  for (i = 0; i < 8; i++) {
54   state <<= 1;
55   if ( state & 0x01000000 )
56    state ^= CRC24_POLY;
57  }
58 }
59
60 return state & 0x00FFFFFFL;
61}
62
63uint32_t roar_adler32_add(uint32_t state, const void * data, size_t len) {
64 const unsigned char * p = data;
65 uint32_t s1 =  state        & 0xFFFFL;
66 uint32_t s2 = (state >> 16) & 0xFFFFL;
67 size_t n;
68
69 if ( data == NULL )
70  return ADLER32_INIT;
71
72 for (n = 0; n < len; n++) {
73  s1 = (s1 + p[n]) % ADLER32_BASE;
74  s2 = (s2 + s1  ) % ADLER32_BASE;
75 }
76
77 return (s2 << 16) + s1;
78}
79
80
81int roar_hash_crc24_init(void * state) {
82 uint32_t * self = state;
83
84 *self = roar_crc24_init();
85
86 return 0;
87}
88
89int roar_hash_crc24_digest(void * state, void * digest, size_t * len) {
90 uint32_t * self = state;
91 unsigned char * out  = digest;
92 register uint32_t crc;
93
94 if ( *len < 3 )
95  return -1;
96
97 *len = 3;
98
99 crc = *self;
100
101 out[0] = ((crc & 0x00FF0000) >> 16) & 0xFF;
102 out[1] = ((crc & 0x0000FF00) >>  8) & 0xFF;
103 out[2] = ((crc & 0x000000FF) >>  0) & 0xFF;
104
105 return 0;
106}
107
108int roar_hash_crc24_proc(void * state, const void * data, size_t len) {
109 uint32_t * self = state;
110
111 *self = roar_crc24_add(*self, data, len);
112
113 return 0;
114}
115
116
117int roar_hash_adler32_init(void * state) {
118 uint32_t * self = state;
119
120 *self = roar_adler32_init();
121
122 return 0;
123}
124
125int roar_hash_adler32_digest(void * state, void * digest, size_t * len) {
126 uint32_t * self = state;
127 unsigned char * out  = digest;
128 register uint32_t crc;
129
130 if ( *len < 4 )
131  return -1;
132
133 *len = 4;
134
135 crc = *self;
136
137 out[0] = ((crc & 0xFF000000) >> 24) & 0xFF;
138 out[1] = ((crc & 0x00FF0000) >> 16) & 0xFF;
139 out[2] = ((crc & 0x0000FF00) >>  8) & 0xFF;
140 out[3] = ((crc & 0x000000FF) >>  0) & 0xFF;
141
142 return 0;
143}
144
145int roar_hash_adler32_proc(void * state, const void * data, size_t len) {
146 uint32_t * self = state;
147
148 *self = roar_adler32_add(*self, data, len);
149
150 return 0;
151}
152
153//ll
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