I have several character data fields that happen to contain sections of 
non-ascii binary data including nul characters.  I'd like to get a string 
display that shows all of the characters according to the length of the field, 
i.e.

20 20 20 20 20 20 01 00 01 00 48 31 20 20 20 20 

produces

"      \001\000\001\000H1    "

In proto.c, I see that all of the format_text calls use strlen(bytes) as the 
length.

case FT_STRING:
case FT_STRINGZ:
case FT_UINT_STRING:
        bytes = (guint8 *)fvalue_get(&fi->value);
        label_fill(label_str, hfinfo, format_text(bytes, strlen(bytes)));

What is the recommended way of creating a text string that uses the octal 
encoding '\xxx' for non-ASCII data including nul characters that uses the 
'length' field of 'proto_tree_add_item'?  I'm currently using FT_STRING, but 
obviously the string label ends at the first nul character.  I do not want 
FT_BYTES because the characters themselves are the important data in the field.

Thanks,
John Dill
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