[Vorbis] ogg_sync_buffer() memory alignment

[Patrick Byrne]

I am writing an Ogg Vorbis decoder for win32.

I want a memory buffer which is aligned to the disk sector size (512 
bytes on hard disk, 2048 bytes on cd/dvd), so that the win32 function 
ReadFile can be persuaded to do 'unbuffered IO'.

Unfortunately, the ogg_sync_buffer() call gives me a pointer from its 
own, internally allocated buffer. I have found no docs to indicate that 
this would be "page-aligned' (say 4k memory pages).

Hopefully I can alter the source to guarantee buffer alignment (about to 
check), but has this issue been addressed elsewhere, please?

Thanks.

-- 
Patrick Byrne,
Frontier Developments Ltd
dd +44 (0)1223 394300
fax +44 (0)1223 420005