mirror of https://github.com/pavel-demin/ft8d.git
60 lines
2.6 KiB
C
60 lines
2.6 KiB
C
#include <stdbool.h>
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static unsigned short table[256] =
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{
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0x0000, 0x1c06, 0x340a, 0x280c, 0x6814, 0x7412, 0x5c1e, 0x4018,
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0xdc2e, 0xc028, 0xe824, 0xf422, 0xb43a, 0xa83c, 0x8030, 0x9c36,
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0xb45a, 0xa85c, 0x8050, 0x9c56, 0xdc4e, 0xc048, 0xe844, 0xf442,
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0x6874, 0x7472, 0x5c7e, 0x4078, 0x0060, 0x1c66, 0x346a, 0x286c,
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0x68b4, 0x74b2, 0x5cbe, 0x40b8, 0x00a0, 0x1ca6, 0x34aa, 0x28ac,
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0xb49a, 0xa89c, 0x8090, 0x9c96, 0xdc8e, 0xc088, 0xe884, 0xf482,
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0xdcee, 0xc0e8, 0xe8e4, 0xf4e2, 0xb4fa, 0xa8fc, 0x80f0, 0x9cf6,
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0x00c0, 0x1cc6, 0x34ca, 0x28cc, 0x68d4, 0x74d2, 0x5cde, 0x40d8,
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0xdd6e, 0xc168, 0xe964, 0xf562, 0xb57a, 0xa97c, 0x8170, 0x9d76,
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0x0140, 0x1d46, 0x354a, 0x294c, 0x6954, 0x7552, 0x5d5e, 0x4158,
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0x6934, 0x7532, 0x5d3e, 0x4138, 0x0120, 0x1d26, 0x352a, 0x292c,
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0xb51a, 0xa91c, 0x8110, 0x9d16, 0xdd0e, 0xc108, 0xe904, 0xf502,
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0xb5da, 0xa9dc, 0x81d0, 0x9dd6, 0xddce, 0xc1c8, 0xe9c4, 0xf5c2,
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0x69f4, 0x75f2, 0x5dfe, 0x41f8, 0x01e0, 0x1de6, 0x35ea, 0x29ec,
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0x0180, 0x1d86, 0x358a, 0x298c, 0x6994, 0x7592, 0x5d9e, 0x4198,
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0xddae, 0xc1a8, 0xe9a4, 0xf5a2, 0xb5ba, 0xa9bc, 0x81b0, 0x9db6,
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0xb6da, 0xaadc, 0x82d0, 0x9ed6, 0xdece, 0xc2c8, 0xeac4, 0xf6c2,
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0x6af4, 0x76f2, 0x5efe, 0x42f8, 0x02e0, 0x1ee6, 0x36ea, 0x2aec,
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0x0280, 0x1e86, 0x368a, 0x2a8c, 0x6a94, 0x7692, 0x5e9e, 0x4298,
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0xdeae, 0xc2a8, 0xeaa4, 0xf6a2, 0xb6ba, 0xaabc, 0x82b0, 0x9eb6,
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0xde6e, 0xc268, 0xea64, 0xf662, 0xb67a, 0xaa7c, 0x8270, 0x9e76,
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0x0240, 0x1e46, 0x364a, 0x2a4c, 0x6a54, 0x7652, 0x5e5e, 0x4258,
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0x6a34, 0x7632, 0x5e3e, 0x4238, 0x0220, 0x1e26, 0x362a, 0x2a2c,
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0xb61a, 0xaa1c, 0x8210, 0x9e16, 0xde0e, 0xc208, 0xea04, 0xf602,
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0x6bb4, 0x77b2, 0x5fbe, 0x43b8, 0x03a0, 0x1fa6, 0x37aa, 0x2bac,
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0xb79a, 0xab9c, 0x8390, 0x9f96, 0xdf8e, 0xc388, 0xeb84, 0xf782,
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0xdfee, 0xc3e8, 0xebe4, 0xf7e2, 0xb7fa, 0xabfc, 0x83f0, 0x9ff6,
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0x03c0, 0x1fc6, 0x37ca, 0x2bcc, 0x6bd4, 0x77d2, 0x5fde, 0x43d8,
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0x0300, 0x1f06, 0x370a, 0x2b0c, 0x6b14, 0x7712, 0x5f1e, 0x4318,
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0xdf2e, 0xc328, 0xeb24, 0xf722, 0xb73a, 0xab3c, 0x8330, 0x9f36,
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0xb75a, 0xab5c, 0x8350, 0x9f56, 0xdf4e, 0xc348, 0xeb44, 0xf742,
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0x6b74, 0x7772, 0x5f7e, 0x4378, 0x0360, 0x1f66, 0x376a, 0x2b6c
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};
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short crc12(unsigned char const *data, int length)
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{
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unsigned short remainder = 0;
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unsigned char index;
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int i;
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for(i = 0; i < length; ++i)
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{
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index = remainder >> 4;
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remainder <<= 8;
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remainder |= data[i];
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remainder ^= table[index];
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}
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return remainder & 0x0fff;
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}
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bool crc12_check(unsigned char const *data, int length)
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{
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return !crc12(data, length);
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}
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