On Mon, Feb 04, 2013 at 06:53:34PM +0100, Martin Kletzander wrote:
> On 02/04/2013 04:53 PM, Daniel P. Berrange wrote:
> > On Mon, Feb 04, 2013 at 04:46:53PM +0100, Martin Kletzander wrote:
> [...]
> >> +
> >> + /* not fully supported, but qemu knows it, so we should be able to
> >> + * handle this at least basically */
> >> + [VIR_STORAGE_FILE_VDI] = { NULL, ".vdi", LV_LITTLE_ENDIAN,
> >> + -2, 0, 0, 0, 0, -1, NULL},
> >
> > We can do better than that - look at block/vdi.c in QEMU GIT tree
> > to find out the offsets / values for version number, magic signature
> > at least, even if you ignore backing files for now.
> >
>
> Thanks for pointing that out, I've got a v2 and will send it
> after some testing. However, it looks like VDI doesn't have a
> magic, because there is a 40 Byte string at the start that cacn
> contain anything the creating binary puts there. For example
> qemu-img uses "<<< QEMU VM Virtual Disk Image >>>\n". According
> to [1], I'm adding "<<<" as the magic, because we don't fail if
> it doesn't match and we can still match it by the extension then.
No, you need to look at the 'signature' field of the header
instead, which has a fixed magic value
#define VDI_SIGNATURE 0xbeda107f
Daniel
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