mirror of
https://github.com/tsolomko/SWCompression.git
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Timofey Solomko
55 lines
1.5 KiB
Swift
55 lines
1.5 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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class SevenZipCoder {
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/// Possible coder IDs.
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struct ID {
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static let copy: [UInt8] = [0x00]
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/// Shouldn't be used, added for compatibility, `ID.copy` should be used instead.
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static let zipCopy: [UInt8] = [0x04, 0x01, 0x00]
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static let deflate: [UInt8] = [0x04, 0x01, 0x08]
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/// Shouldn't be used, added for compatibility, `ID.bzip2` should be used instead.
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static let zipBzip2: [UInt8] = [0x04, 0x01, 0x0C]
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static let bzip2: [UInt8] = [0x04, 0x02, 0x02]
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static let lzma2: [UInt8] = [0x21]
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static let lzma: [UInt8] = [0x03, 0x01, 0x01]
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}
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let idSize: Int
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let isComplex: Bool
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let hasAttributes: Bool
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let id: [UInt8]
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let numInStreams: Int
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let numOutStreams: Int
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var propertiesSize: Int?
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var properties: [UInt8]?
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init(_ bitReader: BitReader) throws {
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let flags = bitReader.byte()
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guard flags & 0xC0 == 0
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else { throw SevenZipError.internalStructureError }
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idSize = (flags & 0x0F).toInt()
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isComplex = flags & 0x10 != 0
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hasAttributes = flags & 0x20 != 0
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id = bitReader.bytes(count: idSize)
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numInStreams = isComplex ? bitReader.szMbd() : 1
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numOutStreams = isComplex ? bitReader.szMbd() : 1
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if hasAttributes {
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propertiesSize = bitReader.szMbd()
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properties = bitReader.bytes(count: propertiesSize!)
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}
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}
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}
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