Changes in TIFF v3.5.6beta
==========================

.. table:: References
  :widths: auto

  ======================  ==========================================
  Current Version         v3.5.6beta (no release tag)
  Previous Version        :doc:`v3.5.5 <v3.5.5>`
  Master Download Site    `<ftp://ftp.onshore.com/pub/libtiff/>`_
  Master HTTP Site        `<http://www.simplesystems.org/libtiff/>`_
  ======================  ==========================================

This document describes the changes made to the software between the
*previous* and *current* versions (see above).
If you don't find something listed here, then it was not done in this
timeframe, or it was not considered important enough to be mentioned.
The following information is located here:


Software configuration changes
------------------------------

* Added ``GNULDdso`` target and switched linux and freebsd to use it.
* :file:`tools/Makefile.in`: Modified to install properly on SGI.
* :file:`configure`: Fixed DSO test for Linux as per patch from
  `Jan Van Buggenhout <[email protected]>`_.


Library changes
---------------

* :file:`tif_dir.c`: Clear :c:macro:`TIFF_ISTILED` flag in :c:macro:`TIFFDefaultDirectory`
  as per :bugzilla-rs:`18`
  from `<[email protected]>`_.

* Modified :file:`tif_packbits.c` decoding to avoid overrunning the
  output buffer, and to issue a warning if data needs to be
  discarded.  See :bugzilla-rs:`18`

* Modified :c:func:`TIFFClientOpen` to emit an error on an attempt to
  open a compressed file for update (``O_RDWR``/"``r+``") access.  This is
  because the compressor/decompressor code gets very confused when
  the mode is ``O_RDWR``, assuming this means writing only.  See
  bug :bugzilla-rs:`13`

* Applied patch for 0x0000 sequences in :file:`tif_fax3.h` definition
  of :c:macro:`EXPAND1D` as per bug :bugzilla-rs:`11` (from Roman).

* Fixed :file:`tiffcomp.h` to avoid win32 stuff if unix ``#defined``, to improve
  cygwin compatibility.

* Applied patch from Roman Shpount to :file:`tif_fax3.c`.  This seems to
  be a proper fix to the buffer sizing problem.  See 
  :bugzilla-rs:`11`

* Fixed :file:`tif_getimage.c` to fix overrun bug with YCbCr images without
  downsampling.  :bugzilla-rs:`10`
  Thanks to `Nick Lamb <[email protected]>`_ for reporting the
  bug and proving the patch.
  
* Fixed :file:`tif_jpeg.c` to avoid destroying the decompressor before
  we are done access data thanks to bug report from:
  `Michael Eckstein <[email protected]>`_.

* :file:`tif_open.c`: Don't set ``MMAP`` for ``O_RDWR`` files.

* :file:`tif_open.c`: Set :c:macro:`STRIPCHOP_DEFAULT` for ``O_RDWR`` as well as ``O_RDONLY``
  so that files opened for update can be strip chopped too.

* :file:`tif_read.c`: fixed up bug with files missing rowsperstrip and
  the strips per separation fix done a few weeks ago.

* Tentatively added support for :c:macro:`SAMPLEFORMAT_COMPLEXIEEEFP`, and
  :c:macro:`SAMPLEFORMAT_COMPLEXINT`.

* :file:`index.html`, :file:`bugs.html`: added bugzilla info.

* :file:`tif_read.c`: fix subtle bug with determining the number of
  rows for strips that are the last strip in a separation but
  not the last strip of all in :c:func:`TIFFReadEncodedStrip`.

* Applied 16/32 bit fix to :file:`tif_fax3.c`.  Fix supplied by
  `Peter Skarpetis <[email protected]>`_.

* Modified :file:`tiffio.h` logic with regard to including :file:`windows.h`.  It
  won't include it when building with :c:macro:`__CYGWIN__`.

* :file:`README`: update to mention {REDACTED - defunct web site}, don't list Sam's old
  email address.

* :file:`libtiff/tif_dirread.c`: Don't use estimate strip byte count for
  one tile/strip images with an offset, and byte count of zero. These
  could be "unpopulated" images. 

* :file:`tif_win32.c`: Applied patch to fix overreads and ovverwrites
  caught by BoundsChecker.  From `Arvan Pritchard <[email protected]>`_ (untested).
  
* :file:`tif_getimage.c`: Applied patch to silence VC6 warnings.  From
  `Arvan Pritchard <[email protected]>`__.
  
* :file:`tif_lzw.c`: Applied patch to silence VC6 warnings.  From
  `Arvan Pritchard <[email protected]>`__.

* :file:`libtiff/tif_apple.c`: Applied "Carbon" support patches supplied by
  `Leonard Rosenthol <[email protected]>`_.  May interfere
  with correct building on older systems.  If so, please let me know.


Tools changes
-------------

* :file:`tools/rgb2ycbcr.c`: fixed output strip size to account for vertical
  roundup if rows_per_strip not a multiple of vertical sample size.

* :file:`tools/tiffsplit.c`: Copy :c:macro:`TIFFTAG_SAMPLEFORMAT`.

*  Modified :program:`tiff2bw` to ensure portions add to 100%, and that
   white is properly recovered.  See bug
   :bugzilla-rs:`15` Patch
   c/o `Stanislav Brabec <[email protected]>`_


Contributed software changes
----------------------------

* :file:`contrib/addtiffo`: Added "averaging" resampling option.

* Added :file:`contrib/stream` (stream io) code submitted by Avi Bleiweiss.


LZW compression kit changes
---------------------------

* updated :file:`tif_dir.c` to reflect changes to no-lzw :file:`tif_dir.c`.