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SFL Version 2.11 |
#include "sflcryp.h" qbyte calculate_crc (byte *block, size_t length)
Calculates the 32-bit CCITT CRC for a memory block. The CRC calculation is rapid, since the function uses a pre-calculated table. Returns the 32-bit CRC.
{ size_t offset; word this_word; qbyte crc_value; /* Running CRC value */ crc_value = 0xFFFFFFFFL; for (offset = 0; offset < length; offset++) { this_word = block [offset]; this_word = this_word ^ (dbyte) (crc_value & 255); crc_value = (crc_value >> 8) ^ crc_table [this_word]; } return (crc_value ^ 0xFFFFFFFFL); }
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