here - OSTA - Optical Storage Technology Association

ignored and the file creation time from the main File Entry shall be
used.
If the main File Entry is an Extended File Entry, this structure shall
not be recorded with a file creation time.
If the main File Entry is not an Extended File Entry and the File Times
Extended Attribute does not exist or does not contain the file creation time
then an implementation shall use the Modification Time field of the File
Entry to represent the file creation time.
3.3.4.4 Device Specification Extended Attribute
struct DeviceSpecificationExtendedAttribute { /* ECMA 167 4/14.10.7 */
Uint32 AttributeType;
Uint8
AttributeSubtype;
byte
Reserved[3];
Uint32 AttributeLength;
Uint32 ImplementationUseLength; /* (=IU_L) */
Uint32 MajorDeviceIdentification;
Uint32 MinorDeviceIdentification;
byte
ImplementationUse[IU_L];
}
The following paradigm shall be followed by an implementation that creates a
Device Specification Extended Attribute associated with a file :
If and only if a file has a DeviceSpecificationExtendedAttribute associated
with it, the contents of the FileType field in the icbtag structure shall be set
to 6 (indicating a block special device file), OR 7 (indicating a character
special device file).
If the contents of the FileType field in the icbtag structure do not equal 6
or 7, the DeviceSpecificationExtendedAttribute associated with a file shall
be ignored.
In the event that the contents of the FileType field in the icbtag structure
equals 6 or 7, and the file does not have a
DeviceSpecificationExtendedAttribute associated with it, access to the file
shall be denied.
For operating system environments that do not provide for the semantics
associated with a block special device file, requests to
open/read/write/close a file that has the
DeviceSpecificationExtendedAttribute associated with it shall be denied.
UDF 2.01
77
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