[4585] | 1 | //crc.c: |
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| 2 | |
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| 3 | /* |
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[5823] | 4 | * Copyright (C) Philipp 'ph3-der-loewe' Schafft - 2010-2013 |
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[4585] | 5 | * |
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| 6 | * This file is part of libroar a part of RoarAudio, |
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| 7 | * a cross-platform sound system for both, home and professional use. |
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| 8 | * See README for details. |
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| 9 | * |
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| 10 | * This file is free software; you can redistribute it and/or modify |
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| 11 | * it under the terms of the GNU General Public License version 3 |
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| 12 | * as published by the Free Software Foundation. |
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| 13 | * |
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| 14 | * libroar is distributed in the hope that it will be useful, |
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| 15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 17 | * GNU General Public License for more details. |
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| 18 | * |
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| 19 | * You should have received a copy of the GNU General Public License |
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| 20 | * along with this software; see the file COPYING. If not, write to |
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| 21 | * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
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| 22 | * Boston, MA 02110-1301, USA. |
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| 23 | * |
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| 24 | * NOTE for everyone want's to change something and send patches: |
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| 25 | * read README and HACKING! There a addition information on |
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| 26 | * the license of this document you need to read before you send |
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| 27 | * any patches. |
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| 28 | * |
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| 29 | * NOTE for uses of non-GPL (LGPL,...) software using libesd, libartsc |
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| 30 | * or libpulse*: |
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| 31 | * The libs libroaresd, libroararts and libroarpulse link this lib |
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| 32 | * and are therefore GPL. Because of this it may be illigal to use |
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| 33 | * them with any software that uses libesd, libartsc or libpulse*. |
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| 34 | */ |
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| 35 | |
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| 36 | #include "libroar.h" |
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| 37 | |
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| 38 | #define CRC24_POLY 0x01864CFBL |
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| 39 | #define CRC24_INIT 0x00B704CEL |
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| 40 | |
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[4795] | 41 | #define ADLER32_BASE 65521L |
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| 42 | #define ADLER32_INIT 1L |
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| 43 | |
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[4645] | 44 | uint32_t roar_crc24_add(uint32_t state, const void * data, size_t len) { |
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[4585] | 45 | const unsigned char * p = data; |
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| 46 | int i; |
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| 47 | |
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| 48 | if ( data == NULL ) |
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| 49 | return CRC24_INIT; |
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| 50 | |
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| 51 | for (; len; len--) { |
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[5007] | 52 | state ^= ((uint32_t)(*p++)) << 16; |
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[4585] | 53 | for (i = 0; i < 8; i++) { |
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| 54 | state <<= 1; |
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| 55 | if ( state & 0x01000000 ) |
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| 56 | state ^= CRC24_POLY; |
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| 57 | } |
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| 58 | } |
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| 59 | |
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| 60 | return state & 0x00FFFFFFL; |
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| 61 | } |
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| 62 | |
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[4795] | 63 | uint32_t roar_adler32_add(uint32_t state, const void * data, size_t len) { |
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| 64 | const unsigned char * p = data; |
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| 65 | uint32_t s1 = state & 0xFFFFL; |
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| 66 | uint32_t s2 = (state >> 16) & 0xFFFFL; |
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| 67 | size_t n; |
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| 68 | |
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| 69 | if ( data == NULL ) |
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| 70 | return ADLER32_INIT; |
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| 71 | |
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| 72 | for (n = 0; n < len; n++) { |
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| 73 | s1 = (s1 + p[n]) % ADLER32_BASE; |
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| 74 | s2 = (s2 + s1 ) % ADLER32_BASE; |
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| 75 | } |
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| 76 | |
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| 77 | return (s2 << 16) + s1; |
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| 78 | } |
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| 79 | |
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| 80 | |
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[4671] | 81 | int roar_hash_crc24_init(void * state) { |
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| 82 | uint32_t * self = state; |
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| 83 | |
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| 84 | *self = roar_crc24_init(); |
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| 85 | |
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| 86 | return 0; |
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| 87 | } |
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| 88 | |
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| 89 | int roar_hash_crc24_digest(void * state, void * digest, size_t * len) { |
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| 90 | uint32_t * self = state; |
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| 91 | unsigned char * out = digest; |
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| 92 | register uint32_t crc; |
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| 93 | |
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| 94 | if ( *len < 3 ) |
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| 95 | return -1; |
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| 96 | |
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| 97 | *len = 3; |
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| 98 | |
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| 99 | crc = *self; |
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| 100 | |
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| 101 | out[0] = ((crc & 0x00FF0000) >> 16) & 0xFF; |
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| 102 | out[1] = ((crc & 0x0000FF00) >> 8) & 0xFF; |
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| 103 | out[2] = ((crc & 0x000000FF) >> 0) & 0xFF; |
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| 104 | |
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| 105 | return 0; |
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| 106 | } |
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| 107 | |
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| 108 | int roar_hash_crc24_proc(void * state, const void * data, size_t len) { |
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| 109 | uint32_t * self = state; |
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| 110 | |
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| 111 | *self = roar_crc24_add(*self, data, len); |
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| 112 | |
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| 113 | return 0; |
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| 114 | } |
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| 115 | |
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[4795] | 116 | |
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| 117 | int roar_hash_adler32_init(void * state) { |
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| 118 | uint32_t * self = state; |
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| 119 | |
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| 120 | *self = roar_adler32_init(); |
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| 121 | |
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| 122 | return 0; |
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| 123 | } |
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| 124 | |
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| 125 | int roar_hash_adler32_digest(void * state, void * digest, size_t * len) { |
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| 126 | uint32_t * self = state; |
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| 127 | unsigned char * out = digest; |
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| 128 | register uint32_t crc; |
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| 129 | |
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| 130 | if ( *len < 4 ) |
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| 131 | return -1; |
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| 132 | |
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| 133 | *len = 4; |
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| 134 | |
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| 135 | crc = *self; |
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| 136 | |
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| 137 | out[0] = ((crc & 0xFF000000) >> 24) & 0xFF; |
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| 138 | out[1] = ((crc & 0x00FF0000) >> 16) & 0xFF; |
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| 139 | out[2] = ((crc & 0x0000FF00) >> 8) & 0xFF; |
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| 140 | out[3] = ((crc & 0x000000FF) >> 0) & 0xFF; |
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| 141 | |
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| 142 | return 0; |
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| 143 | } |
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| 144 | |
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| 145 | int roar_hash_adler32_proc(void * state, const void * data, size_t len) { |
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| 146 | uint32_t * self = state; |
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| 147 | |
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| 148 | *self = roar_adler32_add(*self, data, len); |
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| 149 | |
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| 150 | return 0; |
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| 151 | } |
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| 152 | |
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[4585] | 153 | //ll |
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