Annotation of libelwix/inc/elwix/acrc.h, revision 1.8
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 $
1.8 ! misho 6: * $Id: acrc.h,v 1.7.36.1 2024/10/10 23:53:00 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:
1.8 ! misho 15: Copyright 2004 - 2024
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
1.7 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
1.7 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);
1.8 ! misho 84: #define crc_32(x, l) crcCalc((x), (l), 32, REVOPTS_REVERTBYTE|REVOPTS_REVERTCRC, 0xFFFFFFFF, 0xFFFFFFFF)
! 85: #define crc_16(x, l) crcCalc((x), (l), 16, REVOPTS_REVERTBYTE|REVOPTS_REVERTCRC, 0x0, 0x0)
! 86: #define crc_16_ccitt(x, l) crcCalc((x), (l), 161, 0, 0x0, 0x0)
! 87: #define crc_16_xmodem(x, l) crcCalc((x), (l), 162, REVOPTS_REVERTBYTE|REVOPTS_REVERTCRC, 0x0, 0x0)
1.1 misho 88:
89: /*
1.8 ! misho 90: * crc16_ccitt() - Checksum calculation
1.7 misho 91: *
92: * @buf = Data for calculation
93: * @bufLen = Length of data
94: * return: Checksum
95: */
1.8 ! misho 96: unsigned short crc16_ccitt(unsigned char * __restrict buf, int bufLen);
1.7 misho 97: /*
1.8 ! misho 98: * crc16_xy() - Checksum calculation in X/Y modem communication
1.7 misho 99: *
100: * @buf = Data for calculation
101: * @bufLen = Length of data
102: * return: Checksum
103: */
1.8 ! misho 104: unsigned short crc16_xy(unsigned char * __restrict buf, int bufLen);
1.7 misho 105: /*
1.1 misho 106: * crcIP() - Checksum in IP communication
107: *
108: * @buf = Data for calculation
109: * @bufLen = Length of data
1.7 misho 110: * return: Checksum
1.1 misho 111: */
1.2 misho 112: unsigned short crcIP(unsigned char * __restrict buf, int bufLen);
1.6 misho 113: /*
114: * crcTCP() - Checksum for TCP v4 communication
115: *
116: * @buf = Data for calculation
117: * @bufLen = Length of data
118: * @th = TCP header
1.7 misho 119: * return: Checksum
1.6 misho 120: */
121: unsigned short crcTCP(struct in_addr src, struct in_addr dst,
122: unsigned char * __restrict th);
123: /*
124: * crcUDP() - Checksum for UDP v4 communication
125: *
126: * @buf = Data for calculation
127: * @bufLen = Length of data
128: * @uh = UDP header
1.7 misho 129: * return: Checksum
1.6 misho 130: */
131: unsigned short crcUDP(struct in_addr src, struct in_addr dst,
132: unsigned char * __restrict uh);
133:
1.1 misho 134: /*
135: * crcFletcher16() - Fletcher-16 Checksum computing
136: *
137: * @nBuf = Data for calculation
138: * @bufLen = Length of data
1.7 misho 139: * return: Checksum
1.1 misho 140: */
1.2 misho 141: unsigned short crcFletcher16(unsigned short * __restrict nBuf, int bufLen);
1.1 misho 142: /*
143: * crcFletcher() - Fletcher-32 Checksum computing
144: *
145: * @nBuf = Data for calculation
146: * @bufLen = Length of data
1.7 misho 147: * return: Checksum
1.1 misho 148: */
1.2 misho 149: unsigned int crcFletcher(unsigned short * __restrict nBuf, int bufLen);
1.1 misho 150: /*
151: * crcAdler() - crcAdler-32 Checksum computing
152: *
153: * @psBuf = Data for calculation
154: * @bufLen = Length of data
1.7 misho 155: * return: Checksum
1.1 misho 156: */
1.2 misho 157: unsigned int crcAdler(unsigned char * __restrict psBuf, int bufLen);
1.1 misho 158:
159: /*
160: * crcEther() - Checksum in Ethernet communication
161: *
162: * @psBuf = Data for calculation
163: * @bufLen = Length of data
1.7 misho 164: * return: Checksum
1.1 misho 165: */
166: #define crcEther(psBuf, bufLen) crcCalc((psBuf), (bufLen), 32, 3, 0xFFFFFFFF, 0xFFFFFFFF)
167:
1.3 misho 168: /*
1.8 ! misho 169: * crc32tbl() - CRC32 calculation from table
1.3 misho 170: *
171: * @crc = Initial crc value
172: * @buf = Data for calculation
173: * @len = Length of data
174: * return: calculated CRC32
175: */
1.8 ! misho 176: unsigned int crc32tbl(unsigned int crc, const unsigned char * __restrict buf, unsigned int len);
1.1 misho 177:
178: /*
179: * crcPelco() - Calculate Pelco D/P CRC
180: *
181: * @ver = Pelco protocol version (Dd | Pp)
182: * @pkt = Packet for calculate crc
183: * return: crc for packet, if is 0 check and crc_GetErrno() == 1
184: Pelco protocol not supported
185: */
1.2 misho 186: unsigned char crcPelco(unsigned char ver, unsigned char *pkt);
1.1 misho 187:
188:
189: /*
190: * hash_varchar() - Compute index hash by variable length string
191: *
192: * @csStr = Input data buffer
193: * @nStrLen = Length of data buffer
194: * @nVer = Version of algorythm; 0 - original, 1 - AITNET variant
195: * return: Hash value
196: */
1.2 misho 197: unsigned int hash_varchar(const char *csStr, int nStrLen, int nVer);
1.1 misho 198: /*
199: * hash_bernstein() - Compute index hash by Bernstein
200: *
201: * @csStr = Input data buffer
202: * @nStrLen = Length of data buffer
203: * @nVer = Version of algorythm; 0 - Bernstein, 1 - DJBX33A variant
204: * return: Hash value
205: */
1.2 misho 206: unsigned int hash_bernstein(const char *csStr, int nStrLen, int nVer);
1.1 misho 207: /*
208: * hash_jenkins() - Compute index hash by Jenkins (one-at-a-time)
209: *
210: * @csStr = Input data buffer
211: * @nStrLen = Length of data buffer
212: * return: Hash value
213: */
1.2 misho 214: unsigned int hash_jenkins(const char *csStr, int nStrLen);
1.1 misho 215: /*
216: * hash_jenkins32() - Fast Jenkins hash function
217: *
218: * @buf = Input buffer
219: * @len = Length of buffer
220: * @prevhash = Previous hash, if participate in continuing hash
221: * return: Hash value
222: */
223: unsigned int hash_jenkins32(const unsigned int *buf, int len, unsigned int prevhash);
224: /*
225: * hash_reddragon() - Compute index hash by Red Dragon
226: *
227: * @csStr = Input data buffer
228: * @nStrLen = Length of data buffer
229: * return: Hash value
230: */
1.2 misho 231: unsigned int hash_reddragon(const char *csStr, int nStrLen);
1.1 misho 232: /*
233: * hash_fnv1() - Compute index hash by FNV-1
234: *
235: * @csStr = Input data buffer
236: * @nStrLen = Length of data buffer
237: * @nVer = Version of algorythm; 0 - FNV-1, 1 - FNV-1a (best avalanche)
238: * return: Hash value
239: */
1.2 misho 240: unsigned int hash_fnv1(const char *csStr, int nStrLen, int nVer);
1.1 misho 241:
242: /*
243: * hash_fnv() - Compute index hash by FNV-1a
244: *
245: * @csStr = Input data buffer
246: * @nStrLen = Length of data buffer
247: * return: Hash value
248: */
249: #define hash_fnv(str, len) hash_fnv1((str), (len), 1)
250:
251:
252: #endif
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