Windows Tempfile Fix Plugin

December 8th, 2006

This is the initial release of the Windows Tempfile Fix plugin. This plugin sets out to make Tempfile binary safe on Windows.

Installation



$ piston import svn://svn.teksol.info/svn/rails/plugins/windows_tempfile_fix vendor\plugins\windows_tempfile_fix

Alternatively:



$ ruby script/plugin install svn://svn.teksol.info/svn/rails/plugins/windows_tempfile_fix

README

As I reported on my blog at http://blog.teksol.info/articles/2006/12/08/rmagick-and-jpeg-datastream-contains-no-image, the Windows version of Ruby will fail to load certain files when they are used through a Tempfile. This is because the Tempfile class does not open it’s files in binary mode.

This plugin is very conservative. It will not install itself if it does not detect the exact version it is supposed to be used against.

This plugin will only do it’s work if it the following expression evaluates to true: RUBY_PLATFORM "i386-mswin32" && RUBY_VERSION “1.8.4”

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RMagick and JPEG datastream contains no image

December 7th, 2006

Today, I hit a major roadblock: “JPEG datastream contains no image”. I turned to Google and found a solution.

Line 55 of tempfile.rb is: 


@tmpfile = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL, 0600)

Unfortunately, on Windows, this causes problems. If the file contains binary data (such as a JPEG datastream…), the fact that we open the file without the BINARY flag sometimes truncates the file content.

I patched my local Ruby 1.8.4 version to this: 


@tmpfile = File.open(tmpname, File::RDWR|File::CREAT|File::EXCL|File::BINARY, 0600)

The only change is I OR the File::BINARY flag to the mode parameter.

Now, I guess I should submit a Ruby enhancement request, no ? With failing test and all ? Sometimes I hate my Windows box…

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I am François Beausoleil, a Ruby on Rails coder. During the day, I work on XLsuite. At night, I am interested many things. Read my biography

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