Ability to modify content in a stream about mscfb HOT 6 CLOSED

Hi cgilling
I've just had a quick go at adding the io.Seeker and io.Writer interfaces to File objects.
This should allow you to seek within a File and change bytes.
Make sure your underlying source is an io.WriterAt and has write permissions if a file.

Current implementation is quick and nasty and the test function (https://github.com/richardlehane/mscfb/blob/master/mscfb_test.go#L146) isn't at all comprehensive. So please consider this experimental feature for now.

Will be interested to hear how you get on with it.

cheers
Richard

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some tests now failing, this needs a bit more work, shouldn't take long

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basic tests, now passing. Added ReadAt() and WriteAt() methods too. See doco at https://godoc.org/github.com/richardlehane/mscfb for usage. Think this is ready to go now.

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sweet thanks, I'll give it a spin soon

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Just a quick update, works great, I was able to implement what I wanted and sent 100,000 random documents through it (of various filetypes include non mscfb filetypes) and no crashing.

Thanks again for the quick turnaround on the request

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Glad to hear, thx for the request

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