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comparison packages/services/crc/current/src/crc16.c @ 395:9f81d6e38c3d

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Fixed 32-bit reliance.
author asl
date Tue, 29 Oct 2002 08:18:17 +0000
parents 544b77bfb6d5
children 74dbf4c3f2e1
comparison
equal deleted inserted replaced
394:7ca632b46393 395:9f81d6e38c3d
54 //========================================================================== 54 //==========================================================================
55 55
56 #include <cyg/crc/crc.h> 56 #include <cyg/crc/crc.h>
57 57
58 // Table of CRC constants - implements x^16+x^12+x^5+1 58 // Table of CRC constants - implements x^16+x^12+x^5+1
59 static const unsigned short crc16_tab[] = { 59 static const cyg_uint16 crc16_tab[] = {
60 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7, 60 0x0000, 0x1021, 0x2042, 0x3063, 0x4084, 0x50a5, 0x60c6, 0x70e7,
61 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef, 61 0x8108, 0x9129, 0xa14a, 0xb16b, 0xc18c, 0xd1ad, 0xe1ce, 0xf1ef,
62 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6, 62 0x1231, 0x0210, 0x3273, 0x2252, 0x52b5, 0x4294, 0x72f7, 0x62d6,
63 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de, 63 0x9339, 0x8318, 0xb37b, 0xa35a, 0xd3bd, 0xc39c, 0xf3ff, 0xe3de,
64 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485, 64 0x2462, 0x3443, 0x0420, 0x1401, 0x64e6, 0x74c7, 0x44a4, 0x5485,
89 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1, 89 0x7c26, 0x6c07, 0x5c64, 0x4c45, 0x3ca2, 0x2c83, 0x1ce0, 0x0cc1,
90 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8, 90 0xef1f, 0xff3e, 0xcf5d, 0xdf7c, 0xaf9b, 0xbfba, 0x8fd9, 0x9ff8,
91 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0, 91 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0,
92 }; 92 };
93 93
94 unsigned short 94 cyg_uint16
95 cyg_crc16(unsigned char *buf, int len) 95 cyg_crc16(unsigned char *buf, int len)
96 { 96 {
97 int i; 97 int i;
98 unsigned short cksum; 98 cyg_uint16 cksum;
99 99
100 cksum = 0; 100 cksum = 0;
101 for (i = 0; i < len; i++) { 101 for (i = 0; i < len; i++) {
102 cksum = crc16_tab[((cksum>>8) ^ *buf++) & 0xFF] ^ (cksum << 8); 102 cksum = crc16_tab[((cksum>>8) ^ *buf++) & 0xFF] ^ (cksum << 8);
103 } 103 }