TIFF CHANGE INFORMATION
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:
MAJOR CHANGES:
- Support for configure/build using CMake.
- Support for large (> 2GB) files under Microsoft Windows.
CHANGES IN THE SOFTWARE CONFIGURATION:
- CMakeLists.txt / CMake
- Configuration and building using CMake is now supported
under Microsoft Windows and on Unix-type systems.
- configure.ac / configure
- Test for and use fseeko() if it is available. This allows
supporting large files on Unix-type systems with a 32-bit 'long'
type and a 64-bit 'off_t' type.
CHANGES IN LIBTIFF:
- tiffiop.h:
- Macros added to use 64-bit equivalents for all standard I/O
and POSIX APIs used by libtiff and its tools which are limited
to 2GB in Windows builds. Note that these 64-bit equivalents
were introduced by the CRT provided with Visual Studio 2005 and
if the necessary CRT is not installed on the target computer,
the program will not run. The wrapper macros will not be
activated unless the definition _MSC_VER is at least 1400 or
__MSVCRT_VERSION__ is at least 0x800.
- tif_unix.c:
- Updated to support large files under Microsoft Windows.
This makes tif_unix.c a completely viable candidate for use
under Windows (in spite of its name) if the CRT is modern
enough. Please note that tif_win32.c already supported large
files, but only 'tiffinfo' and 'tiffdump' made any provision to
support large files under Windows.
- _tiffReadProc() and _tiffWriteProc() are modified to chunk
I/O to a maximum size of 2GB for extremely large I/O
requests. This surmounts limitations in the Microsoft Windows
read() and write() APIs (which are limited to the range of a
32-bit 'int'), and may avoid poor behavior with extremely large
I/O requests on other systems.
CHANGES IN THE TOOLS:
- All tools
- Updated to use I/O wrapper macros from tiffiop.h in order
to support large files under Microsoft Windows.
CHANGES IN THE CONTRIB AREA:
Last updated $Date: 2015-08-28 16:04:56 $.