//
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// CryptoSwift
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//
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// Copyright (C) 2014-2022 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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/// A type that supports incremental updates. For example Digest or Cipher may be updatable
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/// and calculate result incerementally.
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public protocol Updatable {
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/// Update given bytes in chunks.
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///
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/// - parameter bytes: Bytes to process.
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/// - parameter isLast: Indicate if given chunk is the last one. No more updates after this call.
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/// - returns: Processed partial result data or empty array.
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mutating func update(withBytes bytes: ArraySlice<UInt8>, isLast: Bool) throws -> Array<UInt8>
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/// Update given bytes in chunks.
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///
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/// - Parameters:
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/// - bytes: Bytes to process.
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/// - isLast: Indicate if given chunk is the last one. No more updates after this call.
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/// - output: Resulting bytes callback.
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/// - Returns: Processed partial result data or empty array.
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mutating func update(withBytes bytes: ArraySlice<UInt8>, isLast: Bool, output: (_ bytes: Array<UInt8>) -> Void) throws
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}
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extension Updatable {
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@inlinable
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public mutating func update(withBytes bytes: ArraySlice<UInt8>, isLast: Bool = false, output: (_ bytes: Array<UInt8>) -> Void) throws {
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let processed = try update(withBytes: bytes, isLast: isLast)
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if !processed.isEmpty {
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output(processed)
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}
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}
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@inlinable
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public mutating func update(withBytes bytes: ArraySlice<UInt8>, isLast: Bool = false) throws -> Array<UInt8> {
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try self.update(withBytes: bytes, isLast: isLast)
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}
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@inlinable
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public mutating func update(withBytes bytes: Array<UInt8>, isLast: Bool = false) throws -> Array<UInt8> {
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try self.update(withBytes: bytes.slice, isLast: isLast)
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}
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@inlinable
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public mutating func update(withBytes bytes: Array<UInt8>, isLast: Bool = false, output: (_ bytes: Array<UInt8>) -> Void) throws {
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try self.update(withBytes: bytes.slice, isLast: isLast, output: output)
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}
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/// Finish updates. This may apply padding.
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/// - parameter bytes: Bytes to process
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/// - returns: Processed data.
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@inlinable
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public mutating func finish(withBytes bytes: ArraySlice<UInt8>) throws -> Array<UInt8> {
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try self.update(withBytes: bytes, isLast: true)
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}
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@inlinable
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public mutating func finish(withBytes bytes: Array<UInt8>) throws -> Array<UInt8> {
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try self.finish(withBytes: bytes.slice)
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}
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/// Finish updates. May add padding.
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///
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/// - Returns: Processed data
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/// - Throws: Error
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@inlinable
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public mutating func finish() throws -> Array<UInt8> {
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try self.update(withBytes: [], isLast: true)
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}
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/// Finish updates. This may apply padding.
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/// - parameter bytes: Bytes to process
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/// - parameter output: Resulting data
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/// - returns: Processed data.
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@inlinable
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public mutating func finish(withBytes bytes: ArraySlice<UInt8>, output: (_ bytes: Array<UInt8>) -> Void) throws {
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let processed = try update(withBytes: bytes, isLast: true)
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if !processed.isEmpty {
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output(processed)
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}
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}
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@inlinable
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public mutating func finish(withBytes bytes: Array<UInt8>, output: (_ bytes: Array<UInt8>) -> Void) throws {
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try self.finish(withBytes: bytes.slice, output: output)
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}
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/// Finish updates. May add padding.
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///
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/// - Parameter output: Processed data
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/// - Throws: Error
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@inlinable
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public mutating func finish(output: (Array<UInt8>) -> Void) throws {
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try self.finish(withBytes: [], output: output)
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}
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}
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