I have converted the one from fpc to its own library to do streams , can email
it to you later if you wish
-----Original Message-----
From: "Michalis Kamburelis" <michalis.ka...@gmail.com>
Sent: 28/03/2013 6:13 AM
To: "FPC-Pascal users discussions" <fpc-pascal@lists.freepascal.org>
Subject: Re: [fpc-pascal] TStream descendant to compress/decompress gzip data
from another stream
José Mejuto wrote:
> El 27/03/2013 19:22, Michalis Kamburelis escribió:
>
>> Google found an old thread on lazarus mailing list about this ("FPC,
>> gzip and stream") but without any solution, everything mentioned there
>> has either the limitations of TCompressionStream/TDecompressionStream
>> (no gzip format) or TGZFileStream (not able to work wit ObjectPascal
>> streams).
>>
>
> Hello,
>
> .gz is a quite simple format, but it can not be implemented as a TStream
> (only) descendant because in a single .gz file many files could be added
> so something like the class to handle .zip files should be used.
The existing TGZFileStream in ZStream unit already shows that it can be
implemented, i.e. TGZFileStream reads gzip data and is a TStream
descendant. I assume that TGZFileStream simply returns the first file
inside a multi-file gzip (otherwise it would need to call gzopen
multiple times, as far as I understand).
This is also my use case: I know that my .gz files should contain only
one file (X3D standard guarantees it for me), I want to ignore the
remaining files (if any).
>
> Parsing the .gz header is easy, and calling TCompressionStream and
> TDecompressionstream over the payload should be easy, but only for the
> first file in the .gz
>
I will probably have to implement it then. I was hoping to have
something available ready, since ZStream contains things that are *so*
close (but not quite) to what I want :)
Thanks,
Michalis
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