Last change
on this file since 446 was 321, checked in by coas-nagasima, 7 years ago |
文字コードを設定
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Property svn:eol-style
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native
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Property svn:mime-type
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text/x-csrc;charset=UTF-8
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File size:
710 bytes
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[270] | 1 | /*
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| 2 | * Generate a FCS table for the HDLC FCS (RFC1171).
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| 3 | *
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| 4 | * Drew D. Perkins at Carnegie Mellon University.
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| 5 | *
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| 6 | * Code liberally borrowed from Mohsen Banan and D. Hugh Redelmeier.
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| 7 | */
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| 8 |
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| 9 | #include <stdio.h>
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| 10 |
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| 11 | /* The HDLC polynomail: X**0 + X**5 + X**12 + X**16 (0x8408) */
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| 12 |
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| 13 | #define Polynomial 0x8408
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| 14 |
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| 15 | int
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| 16 | main (int argc, char *argv[])
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| 17 | {
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| 18 | unsigned int count, octet;
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| 19 | int bit;
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| 20 |
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| 21 | printf("%s = {\n", argv[1]);
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| 22 | for (count = 0; count < 256; count ++) {
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| 23 | octet = count;
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| 24 | for (bit = 8; bit-- > 0; )
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| 25 | octet = (octet & 0x01) ? ((octet >> 1) ^ Polynomial) : (octet >> 1);
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| 26 | printf("%c0x%04x,", count % 8 ? ' ' : '\t', octet & 0xffff);
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| 27 | if (count % 8 == 7)
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| 28 | putchar('\n');
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| 29 | }
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| 30 | fputs("\t};\n", stdout);
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| 31 | return 0;
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| 32 | }
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