Extended attributes (EAs) can contain any type of data. So that applications can understand the type of information stored in an EA, the first WORD of EA data must specify one of the following data types:
Extended Attribute Data Types
旼컴컴컴컴컴컴컴쩡컴컴컫컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿏ata Type 쿣alue 쿏escription � 쳐컴컴컴컴컴컴컴탠컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿐AT_BINARY 쿑FFE 쿍inary (non-text) data; the first WORD � � � 쿯ollowing the data type specifies the � � � 쿹ength of the data. � 쳐컴컴컴컴컴컴컴탠컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿐AT_ASCII 쿑FFD 쿌SCII text; the first WORD following the� � � 쿭ata type specifies the length of the � � � 쿭ata. � 쳐컴컴컴컴컴컴컴탠컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿐AT_BITMAP 쿑FFB 쿍it map data; the first WORD following � � � 퀃he data type specifies the length of � � � 퀃he data. � 쳐컴컴컴컴컴컴컴탠컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿐AT_METAFILE 쿑FFA 쿘etafile data; the first WORD following � � � 퀃he data type specifies the length of � � � 퀃he data. � 쳐컴컴컴컴컴컴컴탠컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿐AT_ICON 쿑FF9 쿔con data; the first WORD following the � � � 쿭ata type specifies the length of the � � � 쿭ata. � 쳐컴컴컴컴컴컴컴탠컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿐AT_EA 쿑FEE 쿌SCII name of another EA that is � � � 쿪ssociated with the file. The contents � � � 쿽f that EA are to be included into the � � � 쿬urrent EA. The first WORD following the� � � 쿭ata type specifies the length of the � � � 쿭ata. � 쳐컴컴컴컴컴컴컴탠컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿐AT_MVMT 쿑FDF 쿘ulti-Valued, Multi-Typed data-two or � � � 쿺ore consecutive extended attribute � � � 퀆alues. Each value has an explicitly � � � 퀂pecified type. � 쳐컴컴컴컴컴컴컴탠컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿐AT_MVST 쿑FDE 쿘ulti-Valued, Single-Typed data-two or � � � 쿺ore consecutive extended attribute � � � 퀆alues. All values have the same type. � 쳐컴컴컴컴컴컴컴탠컴컴컵컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴� 쿐AT_ASN1 쿑FDD 쿌SN.1 field data; an ISO standard for � � � 쿭escribing multivalue data streams. � 읕컴컴컴컴컴컴컴좔컴컴컨컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴컴�Values of hex 8000 and up are reserved. Values between hex 0000 and hex 7FFF can be defined by the user.
Symbolic constants are defined in BSEDOS.H and BSEDOS.INC.
In all cases, the length specifies the number of bytes of data. Other values for data types, in the range hex 0000 through hex 7FFF, can be used for user-defined extended attributes.
All user-defined data types should be length-preceded, meaning that a WORD indicating the length of the data (in bytes) precedes the data.
For example, here is how to represent the string "Hello":
EAT_ASCII 0005 Hello