[Libguestfs] [PREVIEW ONLY] Refactor data transfer code

[Richard W.M. Jones]

On Wed, Sep 22, 2010 at 09:59:20AM +0100, Matthew Booth wrote:
> Except read and write from a block device, although that could be
> fixed with new APIs.

Um yes indeed.  pwrite-device, pread-device.

> Also, as I said before, I think the handle-based API is a good
> alternative for large data-transfer. I don't think your hexedit
> experience was a good example. For example, I would expect using
> hread to be less code than using pread for reading the contents of a
> file into memory in chunks.

A filename can be used as a handle, except it is a handle that doesn't
need to be opened or closed, so the code simply has to be shorter.
But anyhow if you post the actual code involved then I can try out
both APIs.

The issue with hexedit was managing the handles, specifically making
sure they are closed along all paths.

Rich.

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