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- This mail from Scott describes changes to the library that I have
- not made because I couldn't figure out exactly where they went.
- Anything not in this file has either been placed in the appropriate
- directory (e.g. libtiff/tif_win32.c) or applied to the current
- source code (e.g. libtiff/tiffiop.h).
-
- Note that the Window NT/Window 95 support is untested; Scott's work
- was done with an earlier version of the library. Hopefully this'll
- get cleaned up soon.
-
- Sam
-
- Date: Fri, 14 Apr 95 17:01:42 EDT
- From: wagner@itek.com (scott wagner)
- Message-Id: <9504142101.AA00764@cyan.>
- To: sam@cthulhu.engr.sgi.com
- Subject: Re: Libtiff for Win32 (Windows NT / Windows 95)
-
- Hi, Sam!
-
- Enclosed are my libtiff for win32 pieces. They are in the form of 3 files
- (tif_w32.c, dllshell.c, and libtiff.def), and 2 diffs (for tiffiop.h and
- tiffio.h).
-
- Hope this is not too difficult to separate!
-
- Regards,
- Scott Wagner (wagner@itek.com)
-
- tif_w32.c ---------------------------------------------------------------
-
- tiffiop.h ---------------------------------------------------------------
-
- tiffio.h ---------------------------------------------------------------
- 38a39
- > #ifdef _TIFFIOP_
- 39a41,43
- > #else
- > typedef void TIFF; /* Avoid ANSI undefined structure warning */
- > #endif
- 66a71,75
- > #ifdef WIN32 /* WIN32 identifies Win32 compiles */
- > #pragma warn -sig /* Turn off Borland warn of long to short int convert */
- > #pragma warn -par /* Turn off Borland warn "Parameter x is never used" */
- > DECLARE_HANDLE(thandle_t); /* Win32 file handle */
- > #else /* if not WIN32_ */
- 67a77
- > #endif /* defined WIN32 */
-
- (Message tiff:1396)
- -- using template mhl.format --
- Date: Mon, 17 Apr 1995 07:51:03 EDT
- To: sam@cthulhu.engr.sgi.com
-
- From: wagner@itek.com (scott wagner)
- Subject: Libtiff for Win32
-
- Return-Path: sam@flake.asd.sgi.com
- Delivery-Date: Mon, 17 Apr 1995 05:36:50 PDT
- Return-Path: sam@flake.asd.sgi.com
-
- Hello, Sam!
-
- > ... libtiff for win32 pieces. They are in the form of 3 files
- > (tif_w32.c, dllshell.c, and libtiff.def), and 2 diffs (for tiffiop.h and
- > tiffio.h).
- >
- > I don't understand how these pieces fit together. Can you please explain
- > what dllshell.c and libtiff.def are for?
-
- Sorry I was short on documentation here ... I was rushing to get home to
- dinner on Friday and the material for you was the last loose end I had to
- deal with. Excuses aside ...
-
- The goal of the adaptation of libtiff to Win32 was to replace only one
- environment-specific code module and to make minimal changes to header
- files. tif_win32.c required one addition to tiffio.h (the
- DECLARE_HANDLE line, which is probably a better way to typedef thandle-t
- under Windows 3.1 as well); it also required the addition of pv_map_handle
- to the tiff structure and the conditional definition of the
- TIFFUnmapFileContents macro in tiffiop.h (this because Win32 uses a handle
- and a pointer in mapping memory, and I needed to save both).
-
- Additionally, I made a general style change to tiffio.h. If tiffio.h is
- included by a client, which does not include tiffiop.h, then ANSI compilers
- warn about the typedef of TIFF to a non-existent structure. To avoid this,
- I changed the typedef of TIFF in this case to void.
-
- I also made a style change in the tiff structure. All references to tif_fd
- in the library treat it as int, yet the tif_fd member itself is short. I
- changed this member to int and added the reserved member to maintain
- 32-bit structure member alignment in a 32 bit environment. [ At cost of
- 4 more bytes in an already bloated structure! :-) ] As long as fd's are
- less than 64k, the old member works; this is not the case in Win32, and is
- not generally a safe assumption.
-
- The module dllshell.c and the file libtiff.def are not specific to the
- functionality of libtiff; they are used to make a Win32 dynamic link
- library, and would be best packaged with a Win32 makefile, which I have
- not yet perfected. I will, however, commit to a Borland and Microsoft C
- makefile for libtiff; perhaps these two could be combined with the
- makefile for the _next_ (!) release of libtiff when it is ready.
-
- Once again, sorry for the confused message on Friday. I hope that at
- least tif_w32 and the tiffio.h and tiffiop.h diffs will be useful for
- this release.
-
- Regards,
- Scott Wagner (wagner@itek.com)
- Itek Graphix
- Rochester, NY
-