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Message-Id:	<201201231825.q0NIPeLV026438@delorie.com>
From:	Juan Manuel Guerrero <juan DOT guerrero AT gmx DOT de>
To:	djgpp-announce AT delorie DOT com
Subject:	ANNOUNCE: DJGPP port of XZ utils 5.0.3 uploaded.
Date:	Mon, 23 Jan 2012 12:48:49 +0100

This is a port of XZ utils 5.0.3 to MSDOS/DJGPP.

  
  XZ utils provide a general-purpose data compression library and command line
  tools.  The native file format is the .xz format, but also the legacy .lzma
  format is supported.  The .xz format supports multiple compression algorithms,
  which are called "filters" in context of XZ Utils. The primary filter is
  currently LZMA2.  With typical files, XZ utils create about 30 % smaller
  files than gzip.

  To ease adapting support for the .xz format into existing applications and
  scripts, the API of liblzma is somewhat similar to the API of the popular
  zlib library. For the same reason, the command line tool xz has similar
  command line syntax than that of gzip.


  DJGPP specific changes.
  =======================

  The sources do not compile with djdev203 because inttypes.h and snprintf are
  missed.  This port uses the CVS repository version of snprintf.  The required
  definition for PRIx32 and PRIx64 have been taken from the CVS repository
  version of inttypes.h.
  The library code itself has not been changed.  The code has already enough
  DJGPP support.  But the driver program has no SFN support at all.  It simply
  appends a ".xz" or ".lzma" extension to the original file name according to
  the compression algorithm used.  This will work on systems with LFN support
  but not on plain DOS.  I have applied the same schema that I have used for
  the BZIP2 port.  Unfortunately the original file name is not stored in the
  compressed file header so there will be no way to restore the original file
  name extension on SFN systems.  The program will try to preserve as much
  characters as possible from the extension.
  For SFN systems the following rules apply for ".xz" extension:
    compressed name       uncompressed name
      filename.exx    -->   filename.ex
      filename.exz    -->   filename.e
      filename.xz     -->   filename
    uncompressed name     compressed name
      filename.ext    -->   filename.exx
      filename.ex     -->   filename.exx
      filename.e      -->   filename.exz
      filename        -->   filename.xz

  For SFN systems the following rules apply for ".lzma" extension:
    compressed name       uncompressed name
      filename.exl    -->   filename.ex
      filename.elz    -->   filename.e
      filename.lzm    -->   filename
    uncompressed name     compressed name
      filename.ext    -->   filename.exl
      filename.ex     -->   filename.exl
      filename.e      -->   filename.elz
      filename        -->   filename.lzm

  The port will detect at run time if LFN support is available or not and will
  select the method to handle the extension creation accordingly.  For LFN and
  SFN systems, ".txz" and ".tlz" extensions are always identified as tar files.
  Their file name will always get a ".tar" extension.  On LFN systems the port
  will behave as the original concerning the generation of the extension.
  To compile the sources and run the test suite you will need LFN support.

  Please read the docs to become familiar with the products.




  The port has been compiled using stock djdev203 (patchlevel 2) and consists
  of the two packages that can be downloaded from ftp.delorie.com and mirrors
  as (timestamp 2012-01-22):

    XZ utils 5.0.3 binaries, scripts and man format documentation:
    ftp://ftp.delorie.com/pub/djgpp/current/v2apps/xz-503b.zip

    XZ utils 5.0.3 lzma library and headers:
    ftp://ftp.delorie.com/pub/djgpp/current/v2apps/xz-503a.zip

    XZ utils 5.0.3 pdf format documentation:
    ftp://ftp.delorie.com/pub/djgpp/current/v2apps/xz-503d.zip

    XZ utils 5.0.3 source:
    ftp://ftp.delorie.com/pub/djgpp/current/v2apps/xz-503s.zip


  The binaries have been produced a second time using the stock version of
  djdev204 beta library.  This package is available at ftp.delorie.com and
  mirrors as (timestamp 2012-01-22):

    XZ utils 5.0.3 binaries, scripts and man format documentation:
    ftp://ftp.delorie.com/pub/djgpp/beta/v2apps/xz-503b.zip

    XZ utils 5.0.3 lzma library and headers:
    ftp://ftp.delorie.com/pub/djgpp/beta/v2apps/xz-503a.zip


  Send libpng specific bug reports to <lasse DOT collin AT tukaani DOT org>.
  Send suggestions and bug reports concerning the DJGPP port to
  comp.os.msdos.djgpp or <djgpp AT delorie DOT com>.


Enjoy.

        Guerrero, Juan Manuel <juan DOT guerrero AT gmx DOT de>

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