# ArchiveHeader.Field An enumeration that describes the type, key, and value of a header field. ``` enum Field ``` ## Topics ### Field Constants [`case blob(key: ArchiveHeader.FieldKey, size: UInt64, offset: UInt64)`](/documentation/AppleArchive/ArchiveHeader/Field/blob(key:size:offset:)) An enumeration that indicates the field is a data blob. [`case flag(key: ArchiveHeader.FieldKey)`](/documentation/AppleArchive/ArchiveHeader/Field/flag(key:)) An enumeration that indicates the field is a flag. [`case hash(key: ArchiveHeader.FieldKey, hashFunction: ArchiveHash, value: ContiguousArray)`](/documentation/AppleArchive/ArchiveHeader/Field/hash(key:hashFunction:value:)) An enumeration that indicates the field is a hash. [`case string(key: ArchiveHeader.FieldKey, value: String)`](/documentation/AppleArchive/ArchiveHeader/Field/string(key:value:)) An enumeration that indicates the field is a string. [`case timespec(key: ArchiveHeader.FieldKey, value: timespec)`](/documentation/AppleArchive/ArchiveHeader/Field/timespec(key:value:)) An enumeration that indicates the field is a time value. [`case uint(key: ArchiveHeader.FieldKey, value: UInt64)`](/documentation/AppleArchive/ArchiveHeader/Field/uint(key:value:)) An enumeration that indicates the field is an unsigned integer. ### Instance Properties [`var key: ArchiveHeader.FieldKey`](/documentation/AppleArchive/ArchiveHeader/Field/key) The field key of this field. [`var type: ArchiveHeader.FieldType`](/documentation/AppleArchive/ArchiveHeader/Field/type) The field type of this field. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)