---
title: Decompressing single files
framework: accelerate
role: article
role_heading: Article
path: accelerate/decompressing-single-files
---

# Decompressing single files

Recreate a single file from a compressed file.

## Overview

Overview In this article, you’ll learn how to use AppleArchive to decompress a previously compressed file, and write the decompressed data to a file. The code below decompresses the file generated using the steps explained in Compressing single files. Create the file stream to read the source archive The ArchiveByteStream class provides static factory methods that create streams for different functions. In this case, use fileStream(path:mode:options:permissions:) to create a byte stream that reads the source file: let archiveFilePath = FilePath(NSTemporaryDirectory() + "myFile.pdf.lzfse")

guard let readFileStream = ArchiveByteStream.fileStream(         path: archiveFilePath,         mode: .readOnly,         options: [ ],         permissions: FilePermissions(rawValue: 0o644)) else {     return } defer {     try? readFileStream.close() } Create the file stream to write the decompressed file You also use fileStream(path:mode:options:permissions:) to create the file stream that writes the decompressed file to the file system. In this case, use the writeOnly mode: let destinationFilePath = FilePath(NSTemporaryDirectory() + "myFile_decompressed.pdf")

guard let writeFileStream = ArchiveByteStream.fileStream(         path: destinationFilePath,         mode: .writeOnly,         options: [ .create ],         permissions: FilePermissions(rawValue: 0o644)) else {     return } defer {     try? writeFileStream.close() } Create the decompression stream Create the decompression stream. Specify the file-reading stream as the input stream that provides the compressed data: guard let decompressStream = ArchiveByteStream.decompressionStream(readingFrom: readFileStream) else {     print("unable to create compress stream")     return } defer {     try? decompressStream.close() } Decompress the source archive Finally, call process(readingFrom:writingTo:) to write the output of the decompression stream to the file-writing stream: do {     _ = try ArchiveByteStream.process(readingFrom: decompressStream,                                       writingTo: writeFileStream) } catch {     print("Handle `ArchiveByteStream.process` failed.") } On return, myFile_decompressed.pdf exists in NSTemporaryDirectory() and contains the decompressed contents of myFile.pdf.lzfse.

## See Also

### Directories, Files, and Data Archives

- [Compressing single files](accelerate/compressing-single-files.md)
- [Compressing file system directories](accelerate/compressing-file-system-directories.md)
- [Decompressing and extracting an archived directory](accelerate/decompressing-and-extracting-an-archived-directory.md)
- [Compressing and saving a string to the file system](accelerate/compressing-and-saving-a-string-to-the-file-system.md)
- [Decompressing and parsing an archived string](accelerate/decompressing-and-parsing-an-archived-string.md)