[Mono-devel-list] System.IO.FileStream patch

[Ben Maurer]

Hello,

I noticed while doing some IO stuff that when FileStream is created it
always allocates a buffer, even if not necessary. For example, if the
user allocates a large buffer for use by the read method, it is
unnecessary to allocate the FileStream buffer.

Some real life examples of this would be tools that read data from a lot
of files, such as a compression tool, or a compiler.

This patch solves that issue by allocating the buffer on first use. All
the System.IO tests that were previously green are still green with this
patch. As a test for its effectiveness, I tested with the monodoc
assembler. It was able to reduce the memory consumption of the program
by 15 MB.

-- Ben
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