"file_getc()" returns either an 8-bit unsigned value, or -1 for error or
EOF; store its return value into an "int", and check for -1 and return
-2, in "esc_read()" (rather than checking "file_error()" at the end).
Clean up some comments, routine names, and variable names - eyeSDN files
are binary, not text.
In "parse_eyesdn_packet_data()", handle the case of an EOF from
"esc_read()".
svn path=/trunk/; revision=10050