Annotation of libelwix/inc/elwix/acrc.h, revision 1.6.28.1
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 $
1.6.28.1! misho 6: * $Id: acrc.h,v 1.6 2017/12/08 00:07:48 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:
1.6.28.1! misho 15: Copyright 2004 - 2019
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
1.6.28.1! misho 67: * return: reflecting number
1.1 misho 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
1.6.28.1! misho 79: * return: CRC checksum
1.1 misho 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: /*
1.6.28.1! misho 86: * crc16() - Checksum in X/Y modem communication
! 87: *
! 88: * @buf = Data for calculation
! 89: * @bufLen = Length of data
! 90: * return: Checksum
! 91: */
! 92: unsigned short crc16(unsigned char * __restrict buf, int bufLen);
! 93: /*
1.1 misho 94: * crcIP() - Checksum in IP communication
95: *
96: * @buf = Data for calculation
97: * @bufLen = Length of data
1.6.28.1! misho 98: * return: Checksum
1.1 misho 99: */
1.2 misho 100: unsigned short crcIP(unsigned char * __restrict buf, int bufLen);
1.6 misho 101: /*
102: * crcTCP() - Checksum for TCP v4 communication
103: *
104: * @buf = Data for calculation
105: * @bufLen = Length of data
106: * @th = TCP header
1.6.28.1! misho 107: * return: Checksum
1.6 misho 108: */
109: unsigned short crcTCP(struct in_addr src, struct in_addr dst,
110: unsigned char * __restrict th);
111: /*
112: * crcUDP() - Checksum for UDP v4 communication
113: *
114: * @buf = Data for calculation
115: * @bufLen = Length of data
116: * @uh = UDP header
1.6.28.1! misho 117: * return: Checksum
1.6 misho 118: */
119: unsigned short crcUDP(struct in_addr src, struct in_addr dst,
120: unsigned char * __restrict uh);
121:
1.1 misho 122: /*
123: * crcFletcher16() - Fletcher-16 Checksum computing
124: *
125: * @nBuf = Data for calculation
126: * @bufLen = Length of data
1.6.28.1! misho 127: * return: Checksum
1.1 misho 128: */
1.2 misho 129: unsigned short crcFletcher16(unsigned short * __restrict nBuf, int bufLen);
1.1 misho 130: /*
131: * crcFletcher() - Fletcher-32 Checksum computing
132: *
133: * @nBuf = Data for calculation
134: * @bufLen = Length of data
1.6.28.1! misho 135: * return: Checksum
1.1 misho 136: */
1.2 misho 137: unsigned int crcFletcher(unsigned short * __restrict nBuf, int bufLen);
1.1 misho 138: /*
139: * crcAdler() - crcAdler-32 Checksum computing
140: *
141: * @psBuf = Data for calculation
142: * @bufLen = Length of data
1.6.28.1! misho 143: * return: Checksum
1.1 misho 144: */
1.2 misho 145: unsigned int crcAdler(unsigned char * __restrict psBuf, int bufLen);
1.1 misho 146:
147: /*
148: * crcEther() - Checksum in Ethernet communication
149: *
150: * @psBuf = Data for calculation
151: * @bufLen = Length of data
1.6.28.1! misho 152: * return: Checksum
1.1 misho 153: */
154: #define crcEther(psBuf, bufLen) crcCalc((psBuf), (bufLen), 32, 3, 0xFFFFFFFF, 0xFFFFFFFF)
155:
1.3 misho 156: /*
1.4 misho 157: * crc_32() - CRC32 calculation from table
1.3 misho 158: *
159: * @crc = Initial crc value
160: * @buf = Data for calculation
161: * @len = Length of data
162: * return: calculated CRC32
163: */
1.4 misho 164: unsigned int crc_32(unsigned int crc, const unsigned char * __restrict buf, unsigned int len);
1.1 misho 165:
166: /*
167: * crcPelco() - Calculate Pelco D/P CRC
168: *
169: * @ver = Pelco protocol version (Dd | Pp)
170: * @pkt = Packet for calculate crc
171: * return: crc for packet, if is 0 check and crc_GetErrno() == 1
172: Pelco protocol not supported
173: */
1.2 misho 174: unsigned char crcPelco(unsigned char ver, unsigned char *pkt);
1.1 misho 175:
176:
177: /*
178: * hash_varchar() - Compute index hash by variable length string
179: *
180: * @csStr = Input data buffer
181: * @nStrLen = Length of data buffer
182: * @nVer = Version of algorythm; 0 - original, 1 - AITNET variant
183: * return: Hash value
184: */
1.2 misho 185: unsigned int hash_varchar(const char *csStr, int nStrLen, int nVer);
1.1 misho 186: /*
187: * hash_bernstein() - Compute index hash by Bernstein
188: *
189: * @csStr = Input data buffer
190: * @nStrLen = Length of data buffer
191: * @nVer = Version of algorythm; 0 - Bernstein, 1 - DJBX33A variant
192: * return: Hash value
193: */
1.2 misho 194: unsigned int hash_bernstein(const char *csStr, int nStrLen, int nVer);
1.1 misho 195: /*
196: * hash_jenkins() - Compute index hash by Jenkins (one-at-a-time)
197: *
198: * @csStr = Input data buffer
199: * @nStrLen = Length of data buffer
200: * return: Hash value
201: */
1.2 misho 202: unsigned int hash_jenkins(const char *csStr, int nStrLen);
1.1 misho 203: /*
204: * hash_jenkins32() - Fast Jenkins hash function
205: *
206: * @buf = Input buffer
207: * @len = Length of buffer
208: * @prevhash = Previous hash, if participate in continuing hash
209: * return: Hash value
210: */
211: unsigned int hash_jenkins32(const unsigned int *buf, int len, unsigned int prevhash);
212: /*
213: * hash_reddragon() - Compute index hash by Red Dragon
214: *
215: * @csStr = Input data buffer
216: * @nStrLen = Length of data buffer
217: * return: Hash value
218: */
1.2 misho 219: unsigned int hash_reddragon(const char *csStr, int nStrLen);
1.1 misho 220: /*
221: * hash_fnv1() - Compute index hash by FNV-1
222: *
223: * @csStr = Input data buffer
224: * @nStrLen = Length of data buffer
225: * @nVer = Version of algorythm; 0 - FNV-1, 1 - FNV-1a (best avalanche)
226: * return: Hash value
227: */
1.2 misho 228: unsigned int hash_fnv1(const char *csStr, int nStrLen, int nVer);
1.1 misho 229:
230: /*
231: * hash_fnv() - Compute index hash by FNV-1a
232: *
233: * @csStr = Input data buffer
234: * @nStrLen = Length of data buffer
235: * return: Hash value
236: */
237: #define hash_fnv(str, len) hash_fnv1((str), (len), 1)
238:
239:
240: #endif
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