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t10crc16.c
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1 /*
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32 
33 /*****************************************************************/
34 /* */
35 /* CRC LOOKUP TABLE */
36 /* ================ */
37 /* The following CRC lookup table was generated automagically */
38 /* by the Rocksoft^tm Model CRC Algorithm Table Generation */
39 /* Program V1.0 using the following model parameters: */
40 /* */
41 /* Width : 2 bytes. */
42 /* Poly : 0x8BB7 */
43 /* Reverse : FALSE. */
44 /* */
45 /* For more information on the Rocksoft^tm Model CRC Algorithm, */
46 /* see the document titled "A Painless Guide to CRC Error */
47 /* Detection Algorithms" by Ross Williams */
48 /* (ross@guest.adelaide.edu.au.). This document is likely to be */
49 /* in the FTP archive "ftp.adelaide.edu.au/pub/rocksoft". */
50 /* */
51 /*****************************************************************/
52 /*
53  * Emulex Inc, changes:
54  * - minor syntax changes for successful compilation with contemporary
55  * C compilers, and OCS SDK API
56  * - crctable[] generated using Rocksoft public domain code
57  *
58  * Used in the Emulex SDK, the generated file crctable.out is cut and pasted into
59  * applicable SDK sources.
60  */
61 
62 #include "t10crc16.h"
63 
64 static unsigned short crctable[256] =
65 {
66  0x0000, 0x8BB7, 0x9CD9, 0x176E, 0xB205, 0x39B2, 0x2EDC, 0xA56B,
67  0xEFBD, 0x640A, 0x7364, 0xF8D3, 0x5DB8, 0xD60F, 0xC161, 0x4AD6,
68  0x54CD, 0xDF7A, 0xC814, 0x43A3, 0xE6C8, 0x6D7F, 0x7A11, 0xF1A6,
69  0xBB70, 0x30C7, 0x27A9, 0xAC1E, 0x0975, 0x82C2, 0x95AC, 0x1E1B,
70  0xA99A, 0x222D, 0x3543, 0xBEF4, 0x1B9F, 0x9028, 0x8746, 0x0CF1,
71  0x4627, 0xCD90, 0xDAFE, 0x5149, 0xF422, 0x7F95, 0x68FB, 0xE34C,
72  0xFD57, 0x76E0, 0x618E, 0xEA39, 0x4F52, 0xC4E5, 0xD38B, 0x583C,
73  0x12EA, 0x995D, 0x8E33, 0x0584, 0xA0EF, 0x2B58, 0x3C36, 0xB781,
74  0xD883, 0x5334, 0x445A, 0xCFED, 0x6A86, 0xE131, 0xF65F, 0x7DE8,
75  0x373E, 0xBC89, 0xABE7, 0x2050, 0x853B, 0x0E8C, 0x19E2, 0x9255,
76  0x8C4E, 0x07F9, 0x1097, 0x9B20, 0x3E4B, 0xB5FC, 0xA292, 0x2925,
77  0x63F3, 0xE844, 0xFF2A, 0x749D, 0xD1F6, 0x5A41, 0x4D2F, 0xC698,
78  0x7119, 0xFAAE, 0xEDC0, 0x6677, 0xC31C, 0x48AB, 0x5FC5, 0xD472,
79  0x9EA4, 0x1513, 0x027D, 0x89CA, 0x2CA1, 0xA716, 0xB078, 0x3BCF,
80  0x25D4, 0xAE63, 0xB90D, 0x32BA, 0x97D1, 0x1C66, 0x0B08, 0x80BF,
81  0xCA69, 0x41DE, 0x56B0, 0xDD07, 0x786C, 0xF3DB, 0xE4B5, 0x6F02,
82  0x3AB1, 0xB106, 0xA668, 0x2DDF, 0x88B4, 0x0303, 0x146D, 0x9FDA,
83  0xD50C, 0x5EBB, 0x49D5, 0xC262, 0x6709, 0xECBE, 0xFBD0, 0x7067,
84  0x6E7C, 0xE5CB, 0xF2A5, 0x7912, 0xDC79, 0x57CE, 0x40A0, 0xCB17,
85  0x81C1, 0x0A76, 0x1D18, 0x96AF, 0x33C4, 0xB873, 0xAF1D, 0x24AA,
86  0x932B, 0x189C, 0x0FF2, 0x8445, 0x212E, 0xAA99, 0xBDF7, 0x3640,
87  0x7C96, 0xF721, 0xE04F, 0x6BF8, 0xCE93, 0x4524, 0x524A, 0xD9FD,
88  0xC7E6, 0x4C51, 0x5B3F, 0xD088, 0x75E3, 0xFE54, 0xE93A, 0x628D,
89  0x285B, 0xA3EC, 0xB482, 0x3F35, 0x9A5E, 0x11E9, 0x0687, 0x8D30,
90  0xE232, 0x6985, 0x7EEB, 0xF55C, 0x5037, 0xDB80, 0xCCEE, 0x4759,
91  0x0D8F, 0x8638, 0x9156, 0x1AE1, 0xBF8A, 0x343D, 0x2353, 0xA8E4,
92  0xB6FF, 0x3D48, 0x2A26, 0xA191, 0x04FA, 0x8F4D, 0x9823, 0x1394,
93  0x5942, 0xD2F5, 0xC59B, 0x4E2C, 0xEB47, 0x60F0, 0x779E, 0xFC29,
94  0x4BA8, 0xC01F, 0xD771, 0x5CC6, 0xF9AD, 0x721A, 0x6574, 0xEEC3,
95  0xA415, 0x2FA2, 0x38CC, 0xB37B, 0x1610, 0x9DA7, 0x8AC9, 0x017E,
96  0x1F65, 0x94D2, 0x83BC, 0x080B, 0xAD60, 0x26D7, 0x31B9, 0xBA0E,
97  0xF0D8, 0x7B6F, 0x6C01, 0xE7B6, 0x42DD, 0xC96A, 0xDE04, 0x55B3
98 };
99 
100 /*****************************************************************/
101 /* End of CRC Lookup Table */
102 /*****************************************************************/
103 
104 /**
105  * @brief Calculate the T10 PI CRC guard value for a block.
106  *
107  * Code based on Rocksoft's public domain CRC code, refer to
108  * http://www.ross.net/crc/download/crc_v3.txt. Minimally altered
109  * to work with the ocs_dif API.
110  *
111  * @param blk_adr Pointer to the data buffer.
112  * @param blk_len Number of bytes.
113  * @param crc Previously-calculated CRC, or crcseed for a new block.
114  *
115  * @return Returns the calculated CRC, which may be passed back in for partial blocks.
116  *
117  */
118 
119 unsigned short
120 t10crc16(const unsigned char *blk_adr, unsigned long blk_len, unsigned short crc)
121 {
122  if (blk_len > 0) {
123  while (blk_len--) {
124  crc = crctable[((crc>>8) ^ *blk_adr++) & 0xFFL] ^ (crc << 8);
125  }
126  }
127  return crc;
128 }
t10crc16
unsigned short t10crc16(const unsigned char *blk_adr, unsigned long blk_len, unsigned short crc)
Calculate the T10 PI CRC guard value for a block.
Definition: t10crc16.c:120
crctable
static unsigned short crctable[256]
Definition: t10crc16.c:64