count characters in specific records

Shell Programming and Scripting
1

I have a text file which represents a http flow like this:

HTTP/1.1 200 OK 
Date: Fri, 23 Jan 2009 17:16:24 GMT 
Server: Apache 
Last-Modified: Fri, 23 Jan 2009 17:08:03 GMT 
Accept-Ranges: bytes 
Cache-Control: max-age=540 
Expires: Fri, 23 Jan 2009 17:21:31 GMT 
Vary: Accept-Encoding 
Content-Encoding: gzip 
Age: 233 
Content-Length: 1276 
Keep-Alive: timeout=1, max=198 
Connection: Keep-Alive 
Content-Type: application/x-javascript 

.4..5...5...>...>.m.....>.Y..?...i...W....X.....&..3}..C}0...3kt.{.k.l....@..........=`...=...e
.g.w.{i.a.,~...Gy..[..s...Bo=.An.$.........m..6j..j....
Dy..Z..:a...m.....qQ...Y&F.Q..*.`<3.uO<....2.3hA.PG4.}:*o..2.z..T..PL<QUX....j........b.%.2.....].v..Nq..iK..S..d..q....9w<.\...............p.9w.v."~......#.'...M.Ju.........n...z.H%Ae..a...[R...rX....k.:.EM..j.W.Z\5..K.v....!n.)..K..JQVT0..X?{v..Bm.......rN?.>>....0..s....*.+....Q.^.#..g.^G.I........;.a..fq......^....S..?g.k[^JE...9+.....HTTP/1.1 200 OK 
Date: Fri, 23 Jan 2009 17:16:24 GMT 
Server: Apache 
Last-Modified: Thu, 18 Sep 2008 09:38:18 GMT 
Accept-Ranges: bytes 
Content-Length: 1903 
Cache-Control: max-age=604800 
Expires: Fri, 30 Jan 2009 17:08:23 GMT 
Age: 481 
Keep-Alive: timeout=1, max=197 
Connection: Keep-Alive 
Content-Type: image/jpeg 
 
......JFIF.....x.x.....C..............

I need to count characters (bytes) in packet payloads. I noticed that if a packet has a payload this is after a blank line following the headers. It is possible that a new header is attached to a preceding packet as shown in the example. I need an output like this:

pkt1 payload size
pkt2 payload size
....... ........
pktn payload size

Thanks in advance

2

Each payload ends with something like "HTTP/1.1 200 OK" and the next one starts with Date:

So you could do something like this:

awk /^Content-Type: /,/^Date: / && /GMT$/ { packet++; count+=length($0); } /^Server: / { print "Packet " packet, "payload size",count; count=0; } END { print count; }