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40 lines
1.6 KiB
40 lines
1.6 KiB
// |
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// CryptoSwift |
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// |
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// Copyright (C) 2014-2021 Marcin Krzyżanowski <marcin@krzyzanowskim.com> |
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// This software is provided 'as-is', without any express or implied warranty. |
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// |
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// In no event will the authors be held liable for any damages arising from the use of this software. |
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// |
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// Permission is granted to anyone to use this software for any purpose,including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: |
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// |
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// - The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation is required. |
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// - Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. |
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// - This notice may not be removed or altered from any source or binary distribution. |
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// |
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/// All the bytes that are required to be padded are padded with zero. |
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/// Zero padding may not be reversible if the original file ends with one or more zero bytes. |
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struct ZeroPadding: PaddingProtocol { |
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init() { |
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} |
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@inlinable |
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func add(to bytes: Array<UInt8>, blockSize: Int) -> Array<UInt8> { |
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let paddingCount = blockSize - (bytes.count % blockSize) |
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if paddingCount > 0 { |
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return bytes + Array<UInt8>(repeating: 0, count: paddingCount) |
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} |
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return bytes |
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} |
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@inlinable |
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func remove(from bytes: Array<UInt8>, blockSize _: Int?) -> Array<UInt8> { |
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for (idx, value) in bytes.reversed().enumerated() { |
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if value != 0 { |
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return Array(bytes[0..<bytes.count - idx]) |
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} |
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} |
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return bytes |
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} |
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}
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