Guard against very large packets.
Guard against very large packets.

Their size could overflow a long (especially on, e.g., Win64, where
 they could still fit in memory).


git-svn-id: a21e2c1a9f1a66aa2b49a2fb7314df0f83771e9b@18758 0101bb08-14d6-0310-b084-bc0e0c8e3800

oss-forks/libogg,pcwalton/ogg,spritebuilder/ogg,ShiftMediaProject/ogg,TitaniumEagle/libogg,spritebuilder/ogg,KTXSoftware/ogg,Distrotech/libogg,gcp/libogg,pcwalton/ogg,KTXSoftware/ogg,Distrotech/libogg,pcwalton/ogg,TitaniumEagle/libogg,OffByOneStudios/ogg,gcp/libogg,ShiftMediaProject/ogg,wighawag/ogg,oss-forks/libogg,Rillke/libogg,libninjam/libogg,OffByOneStudios/ogg,oss-forks/libogg,Rillke/libogg,libninjam/libogg,wighawag/ogg