Module checksum 

FIX checksum calculation.

The FIX checksum is the sum of all bytes in the message (excluding the checksum field itself) modulo 256, formatted as a 3-digit zero-padded string.

Functions

calculate_checksum

Calculates the FIX checksum for the given data.

format_checksum

Formats a checksum value as a 3-digit zero-padded string.

parse_checksum

Parses a 3-digit checksum string to a u8 value.