1: /*************************************************************************
2: * (C) 2013 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
3: * by Michael Pounov <misho@elwix.org>
4: *
5: * $Author: misho $
6: * $Id: acrc.h,v 1.11 2025/08/21 15:43:00 misho Exp $
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:
15: Copyright 2004 - 2024
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: #ifdef __cplusplus
62: extern "C" {
63: #endif
64:
65: /*
66: * crcReflect() - Reflect all bits of number
67: *
68: * @crcNum = Number for reflection
69: * @crcBits = Number width bits
70: * return: reflecting number
71: */
72: unsigned int crcReflect(unsigned int crcNum, unsigned char crcBits);
73: /*
74: * crcCalc() - Generic CRC calculation function for many sub variants of CRC algorithms
75: *
76: * @psBuf = Data for calculation
77: * @bufLen = Length of data
78: * @crcBits = CRC algorithm bits (1, 4, 5, 6, 7, 8, 10, 11, 12, 15, 16, 24, 30, 32)
79: * @RevOpts = Options for computation (REVOPTS_REVERTBYTE, REVOPTS_REVERTCRC)
80: * @initCRC = Initial CRC value
81: * @xorCRC = Last xor CRC value
82: * return: CRC checksum
83: */
84: unsigned int crcCalc(unsigned char * __restrict psBuf, unsigned int bufLen,
85: unsigned char crcBits, unsigned char RevOpts,
86: unsigned int initCRC, unsigned int xorCRC);
87: #define crc_32(x, l) crcCalc((x), (l), 32, REVOPTS_REVERTBYTE|REVOPTS_REVERTCRC, 0xFFFFFFFF, 0xFFFFFFFF)
88: #define crc_16(x, l) crcCalc((x), (l), 16, REVOPTS_REVERTBYTE|REVOPTS_REVERTCRC, 0x0, 0x0)
89: #define crc_16_ccitt(x, l) crcCalc((x), (l), 161, 0, 0x0, 0x0)
90: #define crc_16_xmodem(x, l) crcCalc((x), (l), 162, REVOPTS_REVERTBYTE|REVOPTS_REVERTCRC, 0x0, 0x0)
91: #define crc_8(x, l) crcCalc((x), (l), 8, 0, 0x0, 0x0)
92:
93: /*
94: * crc16_ccitt() - Checksum calculation
95: *
96: * @buf = Data for calculation
97: * @bufLen = Length of data
98: * return: Checksum
99: */
100: unsigned short crc16_ccitt(unsigned char * __restrict buf, int bufLen);
101: /*
102: * crc16_xy() - Checksum calculation in X/Y modem communication
103: *
104: * @buf = Data for calculation
105: * @bufLen = Length of data
106: * return: Checksum
107: */
108: unsigned short crc16_xy(unsigned char * __restrict buf, int bufLen);
109: /*
110: * crcIP() - Checksum in IP communication
111: *
112: * @buf = Data for calculation
113: * @len = Length of data in bytes
114: * return: Checksum
115: */
116: unsigned short crcIP(unsigned short* __restrict buf, int len);
117: /*
118: * crcTCP() - Checksum for TCP v4 communication
119: *
120: * @buf = Data for calculation
121: * @bufLen = Length of data
122: * @th = TCP header
123: * return: Checksum
124: */
125: unsigned short crcTCP(struct in_addr src, struct in_addr dst,
126: unsigned char * __restrict th);
127: /*
128: * crcUDP() - Checksum for UDP v4 communication
129: *
130: * @buf = Data for calculation
131: * @bufLen = Length of data
132: * @uh = UDP header
133: * return: Checksum
134: */
135: unsigned short crcUDP(struct in_addr src, struct in_addr dst,
136: unsigned char * __restrict uh);
137:
138: /*
139: * crcFletcher16() - Fletcher-16 Checksum computing
140: *
141: * @nBuf = Data for calculation
142: * @bufLen = Length of data
143: * return: Checksum
144: */
145: unsigned short crcFletcher16(unsigned short * __restrict nBuf, int bufLen);
146: /*
147: * crcFletcher() - Fletcher-32 Checksum computing
148: *
149: * @nBuf = Data for calculation
150: * @bufLen = Length of data
151: * return: Checksum
152: */
153: unsigned int crcFletcher(unsigned short * __restrict nBuf, int bufLen);
154: /*
155: * crcAdler() - crcAdler-32 Checksum computing
156: *
157: * @psBuf = Data for calculation
158: * @bufLen = Length of data
159: * return: Checksum
160: */
161: unsigned int crcAdler(unsigned char * __restrict psBuf, int bufLen);
162:
163: /*
164: * crcEther() - Checksum in Ethernet communication
165: *
166: * @psBuf = Data for calculation
167: * @bufLen = Length of data
168: * return: Checksum
169: */
170: #define crcEther(psBuf, bufLen) crcCalc((psBuf), (bufLen), 32, 3, 0xFFFFFFFF, 0xFFFFFFFF)
171:
172: /*
173: * crc8tbl() - CRC8 calculation from table
174: *
175: * @crc = Initial crc value
176: * @buf = Data for calculation
177: * @len = Length of data
178: * return: calculated CRC8
179: */
180: uint8_t crc8tbl(unsigned char crc, const unsigned char * __restrict buf, unsigned int len);
181: /*
182: * crc32tbl() - CRC32 calculation from table
183: *
184: * @crc = Initial crc value
185: * @buf = Data for calculation
186: * @len = Length of data
187: * return: calculated CRC32
188: */
189: unsigned int crc32tbl(unsigned int crc, const unsigned char * __restrict buf, unsigned int len);
190:
191: /*
192: * crcPelco() - Calculate Pelco D/P CRC
193: *
194: * @ver = Pelco protocol version (Dd | Pp)
195: * @pkt = Packet for calculate crc
196: * return: crc for packet, if is 0 check and crc_GetErrno() == 1
197: Pelco protocol not supported
198: */
199: unsigned char crcPelco(unsigned char ver, unsigned char *pkt);
200:
201:
202: /*
203: * hash_varchar() - Compute index hash by variable length string
204: *
205: * @csStr = Input data buffer
206: * @nStrLen = Length of data buffer
207: * @nVer = Version of algorythm; 0 - original, 1 - AITNET variant
208: * return: Hash value
209: */
210: unsigned int hash_varchar(const char *csStr, int nStrLen, int nVer);
211: /*
212: * hash_bernstein() - Compute index hash by Bernstein
213: *
214: * @csStr = Input data buffer
215: * @nStrLen = Length of data buffer
216: * @nVer = Version of algorythm; 0 - Bernstein, 1 - DJBX33A variant
217: * return: Hash value
218: */
219: unsigned int hash_bernstein(const char *csStr, int nStrLen, int nVer);
220: /*
221: * hash_jenkins() - Compute index hash by Jenkins (one-at-a-time)
222: *
223: * @csStr = Input data buffer
224: * @nStrLen = Length of data buffer
225: * return: Hash value
226: */
227: unsigned int hash_jenkins(const char *csStr, int nStrLen);
228: /*
229: * hash_jenkins32() - Fast Jenkins hash function
230: *
231: * @buf = Input buffer
232: * @len = Length of buffer
233: * @prevhash = Previous hash, if participate in continuing hash
234: * return: Hash value
235: */
236: unsigned int hash_jenkins32(const unsigned int *buf, int len, unsigned int prevhash);
237: /*
238: * hash_reddragon() - Compute index hash by Red Dragon
239: *
240: * @csStr = Input data buffer
241: * @nStrLen = Length of data buffer
242: * return: Hash value
243: */
244: unsigned int hash_reddragon(const char *csStr, int nStrLen);
245: /*
246: * hash_fnv1() - Compute index hash by FNV-1
247: *
248: * @csStr = Input data buffer
249: * @nStrLen = Length of data buffer
250: * @nVer = Version of algorythm; 0 - FNV-1, 1 - FNV-1a (best avalanche)
251: * return: Hash value
252: */
253: unsigned int hash_fnv1(const char *csStr, int nStrLen, int nVer);
254:
255: /*
256: * hash_fnv() - Compute index hash by FNV-1a
257: *
258: * @csStr = Input data buffer
259: * @nStrLen = Length of data buffer
260: * return: Hash value
261: */
262: #define hash_fnv(str, len) hash_fnv1((str), (len), 1)
263:
264: #ifdef __cplusplus
265: }
266: #endif
267:
268: #endif
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