mirror of
https://github.com/tsolomko/SWCompression.git
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Timofey Solomko
33 lines
836 B
Swift
33 lines
836 B
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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extension DataWithPointer {
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// TODO: Replace with single DataError.
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func multiByteDecode(_ mbiError: Error) throws -> (multiByteInteger: Int, bytesProcessed: [UInt8]) {
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var i = 1
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var result = self.byte().toInt()
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var bytes: [UInt8] = [result.toUInt8()]
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if result <= 127 {
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return (result, bytes)
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}
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result &= 0x7F
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while self.previousByte & 0x80 != 0 {
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let byte = self.byte()
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if i >= 9 || byte == 0x00 {
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throw mbiError
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}
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bytes.append(byte)
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result += (byte.toInt() & 0x7F) << (7 * i)
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i += 1
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}
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return (result, bytes)
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}
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}
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