# withRandomAccessDecompressionStream(readingFrom:allocationLimit:flags:threadCount:_:) Calls the given closure with a decompression random access input stream. ``` static func withRandomAccessDecompressionStream(readingFrom compressedStream: ArchiveByteStream, allocationLimit: Int = Int.max, flags: ArchiveFlags = [], threadCount: Int = 0, _ body: (ArchiveByteStream) throws -> E) throws -> E ``` ## Parameters `compressedStream` An input stream that provides compressed data. `allocationLimit` The requested memory allocation size, in bytes. Set to `0` for lowest memory footprint or for best performance. `flags` Flags that control the behavior of the operation. `threadCount` The number of worker threads that the operation uses, set to `0` for default. `body` A closure with the archive byte stream passed as a parameter. ## Return Value The result of the closure. ## Discussion This function opens a stream created by [`randomAccessDecompressionStream(readingFrom:allocationLimit:flags:threadCount:)`](/documentation/AppleArchive/ArchiveByteStream/randomAccessDecompressionStream(readingFrom:allocationLimit:flags:threadCount:)), calls the specified closure, and closes the stream. --- 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)