Parsing '\x00' -- appears to be the only thing preventing parsing binary data

[Stephen Taylor via Users list for the GNU Bison parser generator]

I am trying to parse binary files and obviously need to write rules that 
include the 8-bit value 0x00 — flex appears to allow me to obtain an 8-bit 
scanner using the -8 option. I seem to be able to use ‘\x01’ to ‘\xFF’ for 
individual terminal symbols in Bison rules. Unfortunately, ‘\x00’ is used to 
denote end of input. Looking at the output tables, there appears to be no real 
reason to do this (other than convenience) and I am wondering if anyone has a 
workaround? 
Thanks !
Steve

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