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Zlib:crc32

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uLong crc32(uLong crc, const Bytef *buf, uInt len);

Update a running CRC-32 with the bytes buf[0..len-1] and return the updated CRC-32. If buf is Z_NULL, this function returns the required initial value for the for the crc. Pre- and post-conditioning (one's complement) is performed within this function so it shouldn't be done by the application.

Usage exampleEdit

uLong crc = crc32(0L, Z_NULL, 0);
while (read_buffer(buffer, length) != EOF) {
    crc = crc32(crc, buffer, length);
}
if (crc != original_crc) error();

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