* Additional notes: The SHA1 message digest of the uncompressed data is
* calculated (except when doing a raw copy --- see below). If the @unhashed
* flag is set on the lookup table entry, this message digest is simply copied
* Additional notes: The SHA1 message digest of the uncompressed data is
* calculated (except when doing a raw copy --- see below). If the @unhashed
* flag is set on the lookup table entry, this message digest is simply copied