Ethereal-dev: Re: [Ethereal-dev] Some TVB rountines I want to add ...
At 08:17 AM 11/28/00 -0500, Ed Warnicke wrote:
>See comments inline...
>
>On Tue, 28 Nov 2000, Richard Sharpe wrote:
>
>> At 12:58 AM 11/28/00 -0800, Guy Harris wrote:
>> >On Tue, Nov 28, 2000 at 01:50:28PM +1000, Richard Sharpe wrote:
>> >> 1. tvb_skip_bytes
>> >>
>> >> int
>> >> tvb_skip_bytes(tvbuff_t *tvb, guint offset, guint8 bytes[],
>> >> guint len, guint min, guint max)
>> >>
>> >> Returns -1 if the specified (len of bytes)*min does not occur at
>> >> the currentoffset, or there is not enough characters in the buffer.
>> >>
>> >> Returns number of bytes skipped if (len bytes)*min found in buffer,
>> up to
>> >> (len bytes)*max. Only complete occurrences of (len bytes)
skipped. Any
>> >> partial initial match does not count!
>> >>
>> >> This does not currently seem to exist as a routine.
>> >
>> >What does it skip over? Occurrences of the exact "len"-byte array of
>> >bytes "bytes"?
>>
>> Yes.
>>
>> >Where would that be used?
>>
>> In protocols where there are literal text strings, or spaces etc separating
>> elements, the call would allow me to skip one or more of them.
>>
>> Ie, with the appropriate calls, it can skip spaces, or tell me if a ':' was
>> there and skip it, and so on, and so forth.
>
>But frequently I don't want to skip over a simple space ( ' ' ) but
>rather over a rfc2234 WSP ( WSP = SP | HTAB ) or LWS
>( LWS = WSP | CRLF WSP ). These are more complicated cases than are
>covered by tvb_skip_bytes() (although I am very much in favor of covering
>this in a more general way than I did with tvb_skip_wsp() in
>plugin/mgcp/packet-mgcp.c ).
Ahhh, some discussion ... This is good. Perhaps I need to pass a list of
characters that will be skipped, like a regex?
>Ed
Regards
-------
Richard Sharpe, sharpe@xxxxxxxxxx
Samba (Team member, www.samba.org), Ethereal (Team member, www.zing.org)
Contributing author, SAMS Teach Yourself Samba in 24 Hours
Author, Special Edition, Using Samba
