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Zlib:adler32

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uLong adler32(uLong adler, const Bytef *buf, uInt len);

Update a running Adler-32 checksum with the bytes buf[0..len-1] and return the updated checksum. If buf is NULL, this function returns the required initial value for the checksum.

An Adler-32 checksum is almost as reliable as a CRC32 but can be computed much faster.

Usage example:

uLong adler = adler32(0L, Z_NULL, 0);
while (read_buffer(buffer, length) != EOF) {
    adler = adler32(adler, buffer, length);
}
if (adler != original_adler) error();

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