here - OSTA - Optical Storage Technology Association

this. Remember that in the latter case, the Implementation Use field shall be at
least 32 bytes.
2.3.4.5 byte ImplementationUse[]
If the LengthofImplementationUse field is non ZERO then the first 32
bytes of this field shall be interpreted as specifying the implementation
identifier EntityID of the implementation which last modified the File
Identifier Descriptor.
If the LengthofImplementationUse field is non ZERO then the first 32
bytes of this field shall be set to the implementation identifier EntityID of
the current implementation.
NOTE: For additional information on the proper handling of this field refer to
the section on Entity Identifier.
This field allows an implementation to identify which implementation last created
and/or modified a specific File Identifier Descriptor .
2.3.4.6 char FileIdentifier[]
Contains a File Identifier stored in the OSTA Compressed Unicode format, see
2.1.1. The byte length of this field shall be greater than 1 with the sole exception
of 0 for a parent FID. If the deleted bit is set in the File Characteristics field of this
File Identifier Descriptor, then see 2.3.4.2 for additional rules. If the deleted bit is
not set, then the Unicode representation of the File Identifier shall be unique in
this directory. This requires not only byte-wise uniqueness as required by ECMA
4/8.6, but also uniqueness of the Unicode identifier resulting from uncompress of
the OSTA Compressed Unicode format.
2.3.5 ICB Tag
struct icbtag { /* ECMA 167 4/14.6 */
Uint32 PriorRecordedNumberofDirectEntries;
Uint16 StrategyType;
byte
StrategyParameter[2];
Uint16 MaximumNumberofEntries;
byte
Reserved;
Uint8
FileType;
Lb_addr ParentICBLocation;
Uint16 Flags;
}
UDF 2.01
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