# ArchiveHeader An AppleArchive entry header. ``` class ArchiveHeader ``` ## Topics ### Creating an Archive Header [`init()`](/documentation/AppleArchive/ArchiveHeader/init()) Creates a new empty archive header. [`init?(keySet: ArchiveHeader.FieldKeySet, directory: FilePath, path: FilePath, flags: ArchiveFlags)`](/documentation/AppleArchive/ArchiveHeader/init(keySet:directory:path:flags:)) Creates a new archive header with fields derived from the filesystem object, at the specified directory and path. [`init?(withAAEncodedData: UnsafeBufferPointer)`](/documentation/AppleArchive/ArchiveHeader/init(withAAEncodedData:)) Creates a new archive header from encoded data. [`init(copying: ArchiveHeader)`](/documentation/AppleArchive/ArchiveHeader/init(copying:)) Creates a copy of an archive header. ### Manipulating Fields [`func field(forKey: ArchiveHeader.FieldKey) -> ArchiveHeader.Field?`](/documentation/AppleArchive/ArchiveHeader/field(forKey:)) Returns the field for a specified key. [`struct FieldKey`](/documentation/AppleArchive/ArchiveHeader/FieldKey-swift.struct) A type that’s an alias for the field key structure. [`enum Field`](/documentation/AppleArchive/ArchiveHeader/Field) An enumeration that describes the type, key, and value of a header field. [`var fieldType: ArchiveHeader._FieldTypes`](/documentation/AppleArchive/ArchiveHeader/fieldType-swift.property) The field types of the archive header. [`struct FieldType`](/documentation/AppleArchive/ArchiveHeader/FieldType-swift.struct) Constants that specify the field type of an archive header. [`var fieldKey: ArchiveHeader._FieldKeys`](/documentation/AppleArchive/ArchiveHeader/fieldKey-swift.property) The field keys of the archive header. [`class FieldKeySet`](/documentation/AppleArchive/ArchiveHeader/FieldKeySet) An object that represents a field key set. ### Manipulating Entries [`class EntryAttributes`](/documentation/AppleArchive/ArchiveHeader/EntryAttributes) An object that describes archive entry attributes. [`class EntryXATBlob`](/documentation/AppleArchive/ArchiveHeader/EntryXATBlob) An object that describes the extended attributes of an archive entry. [`var entryType: ArchiveHeader.EntryType?`](/documentation/AppleArchive/ArchiveHeader/entryType-swift.property) The entry type from `TYP` field, or `nil` if missing or invalid. [`struct EntryType`](/documentation/AppleArchive/ArchiveHeader/EntryType-swift.struct) Constants that specify the filesystem entry types. [`typealias EntryFilter`](/documentation/AppleArchive/ArchiveHeader/EntryFilter) A type alias for the parameters passed to an archive stream operation’s entry selection and status closure. [`struct EntryMessage`](/documentation/AppleArchive/ArchiveHeader/EntryMessage) Constants that represent message values for the entry message filters. [`enum EntryFilterData`](/documentation/AppleArchive/ArchiveHeader/EntryFilterData) Enumerations that represent entry filter data. [`struct EntryMessageStatus`](/documentation/AppleArchive/ArchiveHeader/EntryMessageStatus) Statuses that you return from an archive stream operation’s entry selection and status closure. ### Accessing File Paths [`var entryPath: FilePath?`](/documentation/AppleArchive/ArchiveHeader/entryPath) The entry from the path field, or nil if missing or invalid. ### Accessing AppleArchive Encoded Data [`func withAAEncodedData((UnsafeBufferPointer) throws -> R) rethrows -> R`](/documentation/AppleArchive/ArchiveHeader/withAAEncodedData(_:)) Executes a closure with encoded data. ### Collection Requirements [`func append(ArchiveHeader.Field)`](/documentation/AppleArchive/ArchiveHeader/append(_:)) [`func remove(at: Int) -> ArchiveHeader.Field`](/documentation/AppleArchive/ArchiveHeader/remove(at:)) [`func removeAll()`](/documentation/AppleArchive/ArchiveHeader/removeAll()) ### Subscripts ### Instance Methods ## Relationships ### Conforms To [`BidirectionalCollection`](/documentation/Swift/BidirectionalCollection) [`Sequence`](/documentation/Swift/Sequence) [`MutableCollection`](/documentation/Swift/MutableCollection) [`Copyable`](/documentation/Swift/Copyable) [`RandomAccessCollection`](/documentation/Swift/RandomAccessCollection) [`Collection`](/documentation/Swift/Collection) [`Escapable`](/documentation/Swift/Escapable) --- 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)