ZEXTERN uLong ZEXPORT adler32 OF((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 Z_NULL, this function returns the
- required initial value for the checksum.
+ return the updated checksum. An Adler-32 value is in the range of a 32-bit
+ unsigned integer. If buf is Z_NULL, this function returns the required
+ initial value for the checksum.
An Adler-32 checksum is almost as reliable as a CRC-32 but can be computed
much faster.
ZEXTERN uLong ZEXPORT crc32 OF((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 crc. Pre- and post-conditioning (one's complement) is
- performed within this function so it shouldn't be done by the application.
+ updated CRC-32. A CRC-32 value is in the range of a 32-bit unsigned integer.
+ If buf is Z_NULL, this function returns the required initial value 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 example: