4.7.0

In this update LZ4 compression and decompression has been implemented. By providing 5 new functions, from a simple LZ4.decompress(data:) function to a more advanced LZ4.compress with 5 required and 3 optional arguments, SWCompression supports all features and options of the LZ4 format and algorithm (including external dictionary (de)compression).

You may also note that the new functions throw errors from a new DataError type instead of the algorithm-specific LZ4Error. The current plan is to use this new enum for all newly added functionality going forward and replace all previous algorithm/format-specific error types in the next major update (like 5.0).

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• Added support for LZ4 compression and decompression by introducing 5 new functions inside LZ4 enum.
  • This enum conforms to the DecompressionAlgorithm and CompressionAlgorithm protocols.
  • Added SWCompression/LZ4 subspec for CocoaPods users.
  • Added support for the use of the LZ4 algorithm in 7-Zip containers.
    • The SWCompression/LZ4 subspec acts as a "optional dependency" for SWCompression/SevenZip subspec.
• Added DataError enum which conforms to Error and Equatable protocols.
• Swift 5.0 is no longer supported.
• Fixed an issue where in some cases Deflate compression would produce incorrect output.
• Optimized performance of the Deflate compression.
• swcomp changes:
  • Increased the lowest required version of SwiftCLI dependency to 6.0.0.
  • Added lz4 command with many options to support all LZ4 features (both compression and decompression).
  • Added --use-format option to the tar command which when used with the -c option allows to force the use of a selected TAR format when creating a TAR container.
  • The -j and -z options of the tar command can now be used together with the -c option to create compressed TAR containers.
  • Added un-lz4, comp-lz4, and comp-lz4-bd subcommands to the benchmark command.
  • Benchmark commands for compression now report compression ratio.