Revision history for Perl extension PerlIO::Gzip. 0.01 Sat Feb 3 13:51:15 2001 - original version; created by h2xs 1.21 with options -c -n Layer::Gzip /usr/local/include/sfio.h 0.02 Sunday parse gzip header, 40 regression tests 0.03 Tue Feb 6 18:50:01 GMT 2001 Change name from Layer::Gzip to PerlIO::gzip following feedback on p5p. Add checks to Makefile.PL to ensure you have 5.7.0 [or later :-)] and PerlIO configure. 0.04 Tue Feb 6 23:56:16 GMT 2001 Added autopop mode. There must be a better name for it. Changed order in PerlIOGzip_pushed to call PerlIObuf first (D'oh) and to pop without error in autopop mode with a write. 0.05 Sun Feb 11 22:12:42 GMT 2001 Mmm. CRCs at the ends of files - maybe I should check them? Now gives error on close if the z_stream is at the end and either the CRC or the length recorded in the gzip trailer is wrong. Doesn't try these checks for files with no gzip header. PROTOTYPES: DISABLE in the .xs 0.06 Fri Feb 16 23:59:18 GMT 2001 We have compression! Hmm. Didn't check the return from close on perl.gz - transpires there was a bug in my code to read the length of uncompressed data from the gzip file Hmm. Why was I passing *my* args down to the PerlIOBuf I'm a derived class of? On the other hand, why not? ISA or HASA? My args, HASA, I guess, so I'll give it NULL args. 0.07 Sun Feb 18 23:21:48 GMT 2001 s/to/too/ in the BARF message in Makefile.PL [1 character change. Look at the paperwork that generated :-)] use XSLoader rather than Dynaloader. 0.08 Mon Feb 19 21:14:45 GMT 2001 fix bug in get_more's return value that basically prevented you from reading any header with embedded filename from an unbuffered layer. [Obscure, but it's supposed to work with unbuffered] However, still problems with unread, so you can't inflate any gzip file with an original filename (or comment) in the header. This is related to the /* fix me */ mentioned in perlio.c. Hopefully it will be soon. 0.09 Sat Apr 21 16:14:54 BST 2001 The perlio.c layer API has changed by the 5.7.1 release. 0.08 and earlier won't compile - 0.09 mainly consists of necessary changes to function prototypes and the layer struct. 5.7.1 contains a known bug - when opening a file with layers specified, failure of a layer to push is supposed to cause the open to fail. In 5.7.0 it did. In 5.7.1 it doesn't. Commented the tests that will fail due to this bug. Attempted to detect the "OS" type at compile time to set the default OS for the gzip header. 0.10 Sun Aug 26 13:05:25 BST 2001 By 5.7.2 it seems that the pushed argument is passed in as &sv_undef rather than NULL. I wasn't testing SvOK() and was getting use of uninitialized value errors. 0.11 Mon Oct 29 20:28:38 GMT 2001 perlio.c layer API has changed again with the addition of a dup() function for cloning layers across. (both within and across ithreads) Currently I don't want to pretend that PerlIO::gzip can cope with this, hence it will croak. Fixing this properly is a TODO. 0.12 Mon Mar 18 21:03:52 GMT 2002 Catch up with the 5.7.3 perlio API changes. 0.13 Tue Jul 2 21:55:08 BST 2002 Richard Clamp sent me a complete patch to catch up with the 5.8.0-RC2 perlio API changes, and sprinkles C<pTHX>ie dust to make it compile for a threaded perl. (But please don't create any threads or fork on Win32 while a gzip layer is active, as bad things will happen (duplicate frees)) 0.14 Fri Jul 19 23:19:24 BST 2002 Whoops. Same undefined behaviour bug in my argument passing code as PerlIO::subfile. No surprise there, as PerlIO::subfile got the code from PerlIO::gzip. So I'll migrate the fix back from there to here. Well spotted valgrind. Use valgrind. http://developer.kde.org/~sewardj/ It's far more effective than coffee. 0.15 Tue Jul 15 21:07:11 BST 2003 gzip.xs was using PerlIOBuf_close, which isn't on the list of exported symbols. Hence gzip.xs won't link on platforms such as AIX and Windows. This is fixed in 5.8.1 - Inline the code for PerlIOBuf_close when building for 5.8.0. 0.16 Fri Jun 25 09:38:28 BST 2004 Merge this in from Sun Nov 4 15:27:24 GMT 2001: Split the tests from test.pl into t/read.t, t/write.t use Test::More; [Happy Schwern? :-)] and loop over several buffering possibilities. Actually unlink the test perl.gz file. 0.17 Wed Jun 30 18:29:30 BST 2004 Track down the cause of the problem reported by some Linux users. It's another manifestation of the core perlio bug, whereby perlio loses data if you push another layer onto a file handle with unread data. In this case the layer push is happening on some Linux systems because the stdio layer isn't supporting Perl's fast buffer snooping, presuambly because glibc has decided to use mmap() for the file. Work around is for PerlIO::gzip to push its buffering layer before it calls unread, which is a somewhat messy hack, but works. This means that all the TODO tests can be taken out, as they now pass. Fix small typo in read.t 0.18 Sun Oct 1 22:08:32 BST 2006 Patch from alexchorny [at] gmail.com (#21469) - write.t fails (I had the skip arguments wrong) TODO 2 tests in read.t which fail. I'm infering that this is because :stdio opens in text mode, and there's no way to tell it to open in binary mode. Time to consult p5p. 0.19 Sat Feb 28 11:31:29 CET 2015 Two patches from zefram [at] fysh.org (#92412) - usesfio config removal breaks And whose fault was this anyway? (See core commit 0b39d4dc4ab83828) (#92031) - printf format mismatch 0.20 Wed Jun 21 21:29:59 CEST 2017 Patch from Slaven to fix test skip count on Win32 (#76335) Really this should have been in 0.19.