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kusanagi |
1.1 |
#include <stdlib.h> |
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#include <stdio.h> |
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#include <string.h> |
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#define BLEN 8 |
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extern "C"{ |
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short crctof_(short*, short*); |
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} |
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short crctof_(short *oldCRC, short *newCRC) |
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/* void crctof_(short *old,short *new) */ |
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{ |
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union crctof_data { |
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short word; |
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struct bit_field { |
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unsigned b0:1; |
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unsigned b1:1; |
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unsigned b2:1; |
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unsigned b3:1; |
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unsigned b4:1; |
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unsigned b5:1; |
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unsigned b6:1; |
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unsigned b7:1; |
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} bit; |
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} c,d,r; |
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c.word = *oldCRC; |
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d.word = *newCRC; |
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r.word = 0; |
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r.bit.b0 = c.bit.b7 ^ c.bit.b6 ^ c.bit.b0 ^ |
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d.bit.b0 ^ d.bit.b6 ^ d.bit.b7; |
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r.bit.b1 = c.bit.b6 ^ c.bit.b1 ^ c.bit.b0 ^ |
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d.bit.b0 ^ d.bit.b1 ^ d.bit.b6; |
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r.bit.b2 = c.bit.b6 ^ c.bit.b2 ^ c.bit.b1 ^ c.bit.b0 ^ |
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d.bit.b0 ^ d.bit.b1 ^ d.bit.b2 ^ d.bit.b6; |
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r.bit.b3 = c.bit.b7 ^ c.bit.b3 ^ c.bit.b2 ^ c.bit.b1 ^ |
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d.bit.b1 ^ d.bit.b2 ^ d.bit.b3 ^ d.bit.b7; |
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r.bit.b4 = c.bit.b4 ^ c.bit.b3 ^ c.bit.b2 ^ |
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d.bit.b2 ^ d.bit.b3 ^ d.bit.b4; |
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r.bit.b5 = c.bit.b5 ^ c.bit.b4 ^ c.bit.b3 ^ |
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d.bit.b3 ^ d.bit.b4 ^ d.bit.b5; |
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r.bit.b6 = c.bit.b6 ^ c.bit.b5 ^ c.bit.b4 ^ |
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d.bit.b4 ^ d.bit.b5 ^ d.bit.b6; |
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r.bit.b7 = c.bit.b7 ^ c.bit.b6 ^ c.bit.b5 ^ |
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d.bit.b5 ^ d.bit.b6 ^ d.bit.b7 ; |
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return r.word; |
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/* *old = r.word; */ |
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} |
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