mirror of
https://github.com/tsolomko/SWCompression.git
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Timofey Solomko
369da20c16
I've also removed a most occurrences of inout keyword because DWP (and BitReader) are classes and they are already passed by reference in arguments.
42 lines
1.4 KiB
Swift
42 lines
1.4 KiB
Swift
// Copyright (c) 2017 Timofey Solomko
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// Licensed under MIT License
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//
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// See LICENSE for license information
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import Foundation
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/// Provides decompression function for LZMA algorithm.
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public class LZMA: DecompressionAlgorithm {
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/**
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Decompresses `data` using LZMA algortihm.
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If `data` is not actually compressed with LZMA, `LZMAError` will be thrown.
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- Parameter data: Data compressed with LZMA.
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- Throws: `LZMAError` if unexpected byte (bit) sequence was encountered in `data`.
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It may indicate that either data is damaged or it might not be compressed with LZMA at all.
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- Returns: Decompressed data.
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*/
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public static func decompress(data: Data) throws -> Data {
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/// Object with input data which supports convenient work with bit shifts.
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let pointerData = DataWithPointer(data: data)
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return Data(bytes: try decompress(pointerData))
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}
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/**
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- Parameter externalUncompressedSize: stream doesn't contain uncompressed size property,
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and decoder should use externally specified uncompressed size.
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Used in ZIP containers with LZMA compression.
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*/
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static func decompress(_ pointerData: DataWithPointer, _ externalUncompressedSize: Int? = nil) throws -> [UInt8] {
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let lzmaDecoder = try LZMADecoder(pointerData)
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try lzmaDecoder.decodeLZMA(externalUncompressedSize)
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return lzmaDecoder.out
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}
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}
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