On Thu, Mar 28, 2013 at 8:51 AM, José Mejuto <joshy...@gmail.com> wrote: > El 28/03/2013 1:06, Ewald 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. >> >> >> Sorry to just drop in on this quite late, but isn't gzip a compression >> algorithm and not a file format as such? gzip (the command line utility) >> only compresses one file and *doesn't* put this in a multi-file container. >> To get `multi-file gzips`, you will first want to bundle the files and >> compress this bundle (files -> tar -> gzip) or compress the files separately >> and then bundle them together (files -> multiple separate gzipped files -> >> tar). Or are we talking about a different gzip here? >> > > Hello, > > Just quoting the RFC1952 about .gz format: > > --- http://tools.ietf.org/html/rfc1952 -------- > > 2.2. File format > > A gzip file consists of a series of "members" (compressed data > sets). The format of each member is specified in the following > section. The members simply appear one after another in the file, > with no additional information before, between, or after them. > > ----------------------------------------------- > > So I think it is legal to concatenate several .gz files and get a final .gz > with several files inside. > > In the other hand, yes, the usual behavior in .gz is to store only one file. > > --
"Members" refer to each available section according to the flags. Re-read this whole paragraph you posted and a few following you'll realize only one "file" is allowed in a gzip file/blob. -Flávio _______________________________________________ fpc-pascal maillist - fpc-pascal@lists.freepascal.org http://lists.freepascal.org/mailman/listinfo/fpc-pascal