29 lines
741 B
Swift
29 lines
741 B
Swift
//
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// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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//
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import Foundation
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public class ChunkedOutputStreamTransform: StreamTransform {
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public func transform(data: Data) throws -> Data {
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let byteLength = UInt32(data.count)
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var result = Data()
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result.append(Self.writeVariableLengthUInt32(byteLength))
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result.append(data)
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return result
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}
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public static func writeVariableLengthUInt32(_ value: UInt32) -> Data {
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var result = Data()
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var v = value
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while v > 0x7F {
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result.append(contentsOf: [UInt8(v & 0x7f | 0x80)])
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v >>= 7
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}
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result.append(contentsOf: [UInt8(v)])
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return result
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}
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}
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