Annotation of libelwix/inc/elwix/acrc.h, revision 1.5
1.1 misho 1: /*************************************************************************
2: * (C) 2013 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
3: * by Michael Pounov <misho@elwix.org>
4: *
5: * $Author: misho $
1.5 ! misho 6: * $Id: acrc.h,v 1.4.16.1 2015/06/25 00:36:47 misho Exp $
1.1 misho 7: *
8: **************************************************************************
9: The ELWIX and AITNET software is distributed under the following
10: terms:
11:
12: All of the documentation and software included in the ELWIX and AITNET
13: Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>
14:
1.5 ! misho 15: Copyright 2004 - 2015
1.1 misho 16: by Michael Pounov <misho@elwix.org>. All rights reserved.
17:
18: Redistribution and use in source and binary forms, with or without
19: modification, are permitted provided that the following conditions
20: are met:
21: 1. Redistributions of source code must retain the above copyright
22: notice, this list of conditions and the following disclaimer.
23: 2. Redistributions in binary form must reproduce the above copyright
24: notice, this list of conditions and the following disclaimer in the
25: documentation and/or other materials provided with the distribution.
26: 3. All advertising materials mentioning features or use of this software
27: must display the following acknowledgement:
28: This product includes software developed by Michael Pounov <misho@elwix.org>
29: ELWIX - Embedded LightWeight unIX and its contributors.
30: 4. Neither the name of AITNET nor the names of its contributors
31: may be used to endorse or promote products derived from this software
32: without specific prior written permission.
33:
34: THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
35: ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
36: IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
37: ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
38: FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
39: DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
40: OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
41: HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
42: LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
43: OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44: SUCH DAMAGE.
45: */
46: #ifndef __ACRC_H
47: #define __ACRC_H
48:
49:
50: #define REVOPTS_REVERTBYTE 1
51: #define REVOPTS_REVERTCRC 2
52:
53:
54: struct tagCRCPoly {
55: u_char poly_bits;
56: u_int poly_num;
57: char poly_name[19];
58: }; /* size 24bytes */
59: typedef struct tagCRCPoly crcPoly_t;
60:
61:
62: /*
63: * crcReflect() - Reflect all bits of number
64: *
65: * @crcNum = Number for reflection
66: * @crcBits = Number width bits
67: * return: -1 error, !=-1 reflecting number
68: */
1.2 misho 69: unsigned int crcReflect(unsigned int crcNum, unsigned char crcBits);
1.1 misho 70: /*
71: * crcCalc() - Generic CRC calculation function for many sub variants of CRC algorithms
72: *
73: * @psBuf = Data for calculation
74: * @bufLen = Length of data
75: * @crcBits = CRC algorithm bits (1, 4, 5, 6, 7, 8, 10, 11, 12, 15, 16, 24, 30, 32)
76: * @RevOpts = Options for computation (REVOPTS_REVERTBYTE, REVOPTS_REVERTCRC)
77: * @initCRC = Initial CRC value
78: * @xorCRC = Last xor CRC value
79: * return: -1 error, !=-1 CRC checksum
80: */
1.2 misho 81: unsigned int crcCalc(unsigned char * __restrict psBuf, unsigned int bufLen,
1.1 misho 82: unsigned char crcBits, unsigned char RevOpts,
83: unsigned int initCRC, unsigned int xorCRC);
84:
85: /*
86: * crcIP() - Checksum in IP communication
87: *
88: * @buf = Data for calculation
89: * @bufLen = Length of data
90: * return: -1 error, !=-1 Checksum
91: */
1.2 misho 92: unsigned short crcIP(unsigned char * __restrict buf, int bufLen);
1.1 misho 93: /*
94: * crcFletcher16() - Fletcher-16 Checksum computing
95: *
96: * @nBuf = Data for calculation
97: * @bufLen = Length of data
98: * return: -1 error, !=-1 Checksum
99: */
1.2 misho 100: unsigned short crcFletcher16(unsigned short * __restrict nBuf, int bufLen);
1.1 misho 101: /*
102: * crcFletcher() - Fletcher-32 Checksum computing
103: *
104: * @nBuf = Data for calculation
105: * @bufLen = Length of data
106: * return: -1 error, !=-1 Checksum
107: */
1.2 misho 108: unsigned int crcFletcher(unsigned short * __restrict nBuf, int bufLen);
1.1 misho 109: /*
110: * crcAdler() - crcAdler-32 Checksum computing
111: *
112: * @psBuf = Data for calculation
113: * @bufLen = Length of data
114: * return: -1 error, !=-1 Checksum
115: */
1.2 misho 116: unsigned int crcAdler(unsigned char * __restrict psBuf, int bufLen);
1.1 misho 117:
118: /*
119: * crcEther() - Checksum in Ethernet communication
120: *
121: * @psBuf = Data for calculation
122: * @bufLen = Length of data
123: * return: -1 error, !=-1 Checksum
124: */
125: #define crcEther(psBuf, bufLen) crcCalc((psBuf), (bufLen), 32, 3, 0xFFFFFFFF, 0xFFFFFFFF)
126:
1.3 misho 127: /*
1.4 misho 128: * crc_32() - CRC32 calculation from table
1.3 misho 129: *
130: * @crc = Initial crc value
131: * @buf = Data for calculation
132: * @len = Length of data
133: * return: calculated CRC32
134: */
1.4 misho 135: unsigned int crc_32(unsigned int crc, const unsigned char * __restrict buf, unsigned int len);
1.1 misho 136:
137: /*
138: * crcPelco() - Calculate Pelco D/P CRC
139: *
140: * @ver = Pelco protocol version (Dd | Pp)
141: * @pkt = Packet for calculate crc
142: * return: crc for packet, if is 0 check and crc_GetErrno() == 1
143: Pelco protocol not supported
144: */
1.2 misho 145: unsigned char crcPelco(unsigned char ver, unsigned char *pkt);
1.1 misho 146:
147:
148: /*
149: * hash_varchar() - Compute index hash by variable length string
150: *
151: * @csStr = Input data buffer
152: * @nStrLen = Length of data buffer
153: * @nVer = Version of algorythm; 0 - original, 1 - AITNET variant
154: * return: Hash value
155: */
1.2 misho 156: unsigned int hash_varchar(const char *csStr, int nStrLen, int nVer);
1.1 misho 157: /*
158: * hash_bernstein() - Compute index hash by Bernstein
159: *
160: * @csStr = Input data buffer
161: * @nStrLen = Length of data buffer
162: * @nVer = Version of algorythm; 0 - Bernstein, 1 - DJBX33A variant
163: * return: Hash value
164: */
1.2 misho 165: unsigned int hash_bernstein(const char *csStr, int nStrLen, int nVer);
1.1 misho 166: /*
167: * hash_jenkins() - Compute index hash by Jenkins (one-at-a-time)
168: *
169: * @csStr = Input data buffer
170: * @nStrLen = Length of data buffer
171: * return: Hash value
172: */
1.2 misho 173: unsigned int hash_jenkins(const char *csStr, int nStrLen);
1.1 misho 174: /*
175: * hash_jenkins32() - Fast Jenkins hash function
176: *
177: * @buf = Input buffer
178: * @len = Length of buffer
179: * @prevhash = Previous hash, if participate in continuing hash
180: * return: Hash value
181: */
182: unsigned int hash_jenkins32(const unsigned int *buf, int len, unsigned int prevhash);
183: /*
184: * hash_reddragon() - Compute index hash by Red Dragon
185: *
186: * @csStr = Input data buffer
187: * @nStrLen = Length of data buffer
188: * return: Hash value
189: */
1.2 misho 190: unsigned int hash_reddragon(const char *csStr, int nStrLen);
1.1 misho 191: /*
192: * hash_fnv1() - Compute index hash by FNV-1
193: *
194: * @csStr = Input data buffer
195: * @nStrLen = Length of data buffer
196: * @nVer = Version of algorythm; 0 - FNV-1, 1 - FNV-1a (best avalanche)
197: * return: Hash value
198: */
1.2 misho 199: unsigned int hash_fnv1(const char *csStr, int nStrLen, int nVer);
1.1 misho 200:
201: /*
202: * hash_fnv() - Compute index hash by FNV-1a
203: *
204: * @csStr = Input data buffer
205: * @nStrLen = Length of data buffer
206: * return: Hash value
207: */
208: #define hash_fnv(str, len) hash_fnv1((str), (len), 1)
209:
210:
211: #endif
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