38 lines
741 B
C
38 lines
741 B
C
#include "data.h"
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word crc_update(char far * data, word size)
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{
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word i;
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word j;
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word crc = 0;
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for (j = 0; j < size; j++) {
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crc = crc ^ ((word) data[j] << 8);
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for (i = 0; i < 8; i++) {
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if (crc & 0x8000)
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crc = (crc << 1) ^ 0x1021;
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else
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crc <<= 1;
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}
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}
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return crc;
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}
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word crc_update_mem(unsigned long addr, word size)
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{
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word i;
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word j;
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word crc = 0;
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for (j = 0; j < size; j++) {
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crc = crc ^ ((word) * (byte *) (addr + j) << 8);
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for (i = 0; i < 8; i++) {
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if (crc & 0x8000)
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crc = (crc << 1) ^ 0x1021;
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else
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crc <<= 1;
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}
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}
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return crc;
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}
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