Re: Compressing SOAP requests

FYI, deflate follows Zlib as described in RFC 1950 (http://www.ietf.org/rfc/rfc1950.txt?number=1950).  The Zlib DEFLATE method of compression is described in RFC 1951, while gzip is described in RFC 1952 (http://www.ietf.org/rfc/rfc1952.txt?number=1952).  RFC 1952 looks like it specifies 10 bytes for the header, so I am not sure why 8 bytes works....

Scott Nichol

Do not send e-mail directly to this e-mail address,
because it is filtered to accept only mail from
specific mail lists.
----- Original Message ----- 
From: "Scott Nichol" <[email protected]>
To: <[email protected]>
Sent: Friday, November 12, 2004 1:08 PM
Subject: Re: Compressing SOAP requests


Try it without any CRC: I think gzip may be willing to decompress it, anyway.

Scott Nichol

Do not send e-mail directly to this e-mail address,
because it is filtered to accept only mail from
specific mail lists.
----- Original Message ----- 
From: "Nige White" <[email protected]>
To: <[email protected]>
Sent: Friday, November 12, 2004 12:48 PM
Subject: Re: Compressing SOAP requests


> Scott Nichol wrote:
> 
> >The magic header is 8 bytes: "\x1f\x8b\x08\x00\x00\x00\x00\x00".
> >
> >  
> >
> Interesting. I've read elsewhere that the header is 10 bytes, but...
> 
> I've tried writing those 8 bytes followed by the zlib-deflated data, 
> followed by 32 bits of zero.
> 
> Now, where gunzip -t  used to say "invalid compressed data--format violated"
> 
> it says "invalid compressed data--crc error"
> 
> Any idea how to calculate the CRC?
> 
> _____________________________________________________________________
> This message has been checked for all known viruses. Virus scanning
> powered by Messagelabs http://www.messagelabs.com For more information
> e-mail : [email protected]
> 
> 
>