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Improve performance of Tar library (dotnet#74281)
* Avoid unnecessary byte[] allocations * Remove unnecessary use of FileStreamOptions * Clean up Dispose{Async} implementations * Clean up unnecessary consts Not a perf thing, just readability. * Remove MemoryStream/Encoding.UTF8.GetBytes allocations, unnecessary async variants, and overhaul GenerateExtendedAttributesDataStream * Avoid string allocations in ReadMagicAttribute * Avoid allocation in WriteAsOctal * Improve handling of octal * Avoid allocation for version string * Removing boxing and char string allocation in GenerateExtendedAttributeName * Fix a couple unnecessary dictionary lookups * Replace Enum.HasFlag usage * Remove allocations from Write{Posix}Name * Replace ArrayPool use with string.Create * Replace more superfluous ArrayPool usage * Remove ArrayPool use from System.IO.Compression.ZipFile * Fix inverted condition * Use generic math to parse octal * Remove allocations from StringReader and string.Split * Remove magic string allocation for Ustar when not V7 * Remove file name and directory name allocation in GenerateExtendedAttributeName
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