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estimating the worst-possible-case memory usage (the longest row length times the number of rows) to a more reasonable dynamic allocation of memory. Now the buffer is started at 512 bytes and approximately doubled each time it fills. 512 bytes is a compromise that was determined empirically. Most regular scans use less than 512 bytes. Scans with -sV and especially -sC tend to use a few k of memory. See http://seclists.org/nmap-dev/2009/q1/0782.html for the tests.
Here is some documentation for Nmap, but these files are much less comprehensive than what you'll find at the actual Nmap documentation site ( http://nmap.org ).