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This is a utility written in only 149 lines of Swift to extract tar files with the standard 512-block size, or a multiple thereof, created with the GNU tar command:
Warning: This code does not support GNU ZIP (gzip) compression, such as
tar -czf, or non-standard block sizes.
FileManager.default.createFilesAndDirectories(path: "file/path/extracted", tarPath: "file/path/42.tar")
This code is a Swift port of NSFileManager+Tar.m from Octo's Light Untar for iOS written in Objective-C.
Since this code is NOT visible to Objective-C, if you are looking for an Objective-C version, check it out!