mirror of
https://github.com/tsolomko/SWCompression.git
synced 2026-06-23 14:56:41 +00:00
Timofey Solomko
78 lines
2.5 KiB
Swift
78 lines
2.5 KiB
Swift
// Copyright (c) 2017 Timofey Solomko
|
|
// Licensed under MIT License
|
|
//
|
|
// See LICENSE for license information
|
|
|
|
import Foundation
|
|
|
|
class SevenZipCoder {
|
|
|
|
/// Possible coder IDs.
|
|
struct ID {
|
|
// TODO: Left comments column indicates whether coder has been implemented or not (I/NI) and tested (T/NT).
|
|
/* I/T */static let copy: [UInt8] = [0x00]
|
|
/// Shouldn't be used, added for compatibility, `ID.copy` should be used instead.
|
|
/* I/T */static let zipCopy: [UInt8] = [0x04, 0x01, 0x00]
|
|
/* I/T */static let deflate: [UInt8] = [0x04, 0x01, 0x08]
|
|
/// Shouldn't be used, added for compatibility, `ID.bzip2` should be used instead.
|
|
/* I/T */static let zipBzip2: [UInt8] = [0x04, 0x01, 0x0C]
|
|
/* NI/NT */static let zipLzma: [UInt8] = [0x04, 0x01, 0x0E]
|
|
/// For some reason, this method is specified in ZIP section of Methods.txt.
|
|
/* NI/NT */static let xz: [UInt8] = [0x04, 0x01, 0x5F]
|
|
/* I/T */static let bzip2: [UInt8] = [0x04, 0x02, 0x02]
|
|
/* I/T */static let lzma2: [UInt8] = [0x21]
|
|
/* I/T */static let lzma: [UInt8] = [0x03, 0x01, 0x01]
|
|
}
|
|
|
|
let idSize: Int
|
|
let isComplex: Bool
|
|
let hasAttributes: Bool
|
|
|
|
let id: [UInt8]
|
|
|
|
let numInStreams: Int
|
|
let numOutStreams: Int
|
|
|
|
var propertiesSize: Int?
|
|
var properties: [UInt8]?
|
|
|
|
init(_ bitReader: BitReader) throws {
|
|
let flags = bitReader.byte()
|
|
guard flags & 0xC0 == 0
|
|
else { throw SevenZipError.reservedCodecFlags }
|
|
idSize = (flags & 0x0F).toInt()
|
|
isComplex = flags & 0x10 != 0
|
|
hasAttributes = flags & 0x20 != 0
|
|
|
|
guard flags & 0x80 == 0 else { throw SevenZipError.altMethodsNotSupported }
|
|
|
|
id = bitReader.bytes(count: idSize)
|
|
|
|
numInStreams = isComplex ? bitReader.szMbd() : 1
|
|
numOutStreams = isComplex ? bitReader.szMbd() : 1
|
|
|
|
if hasAttributes {
|
|
propertiesSize = bitReader.szMbd()
|
|
properties = bitReader.bytes(count: propertiesSize!)
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
extension SevenZipCoder: Equatable {
|
|
|
|
static func == (lhs: SevenZipCoder, rhs: SevenZipCoder) -> Bool {
|
|
let propertiesEqual: Bool
|
|
if lhs.properties == nil && rhs.properties == nil {
|
|
propertiesEqual = true
|
|
} else if lhs.properties != nil && rhs.properties != nil {
|
|
propertiesEqual = lhs.properties! == rhs.properties!
|
|
} else {
|
|
propertiesEqual = false
|
|
}
|
|
return lhs.id == rhs.id && lhs.numInStreams == rhs.numInStreams &&
|
|
lhs.numOutStreams == rhs.numOutStreams && propertiesEqual
|
|
}
|
|
|
|
}
|