Re: lzlib?

[Kein-Hong Man <mkh@...>]

Rici Lake wrote:
> On 14-Mar-05, at 2:06 PM, PA wrote:
>
> > local zlib = require( "zlib" )
> > local aCompressedContent = zlib.compress( aContent )
> > [snip]
> > "gzip stream does not have a gzip header"
> > What am I doing wrong? Do I need to provide additional parameters to 
> > zlib.compress()?
>
> You need to format the stream by sending a gzip header prior to the 
> compressed content. (You will also need to provide a trailer containing 
> a CRC.) It's annoying, isn't it? And really badly documented. Most of 
> the implementations I've seen are cargo culted from other implementations.
>
> You might find this page a useful place to start. It's not the best, but 
> I only googled for three minutes: 
> http://www.cherrypy.org/wiki/NotesOnTicket59

Just look for these, they are quite readable:
RFC 1950 ZLIB Compressed Data Format Specification version 3
RFC 1951 DEFLATE Compressed Data Format Specification ver 1.3
RFC 1952 GZIP File Format Specification version 4_3

--
Cheers,
Kein-Hong Man (esq.)
Kuala Lumpur, Malaysia