Combining the HTTP Chunks into single packet

Hi,
I need help on the following situation:

Any HTTP data, that comes over the wire in TCP/IP packets, might consist of
multiple chunks. The IP packet would be unique for each of this chunk, and
the HTTP Header ( a status of 100 - Continue) would indicate that the next
packet is in continuation with the the one that is recieved. How would I
able to able to combine all such chunks into a single HTTP request, using
some network sniffer code (which gives me individual IP packets ) ??

Any pointers could prove of great help...
Thanks in advance,

Maulik V. Shah
Software Engineer
Patni Computer Systems Limited, India.