110 lines
4.0 KiB
Swift
110 lines
4.0 KiB
Swift
//
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// BlockEncoding.swift
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// Bases
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//
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// Copyright (c) 2016-2019 Matt Rubin and the Bases authors
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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//
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internal typealias EncodedBlock = (EncodedChar, EncodedChar, EncodedChar, EncodedChar, EncodedChar,
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EncodedChar, EncodedChar, EncodedChar)
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internal func encodeBlock(bytes: UnsafeRawBufferPointer) -> EncodedBlock {
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switch bytes.count {
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case 1:
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return encodeBlock(bytes[0])
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case 2:
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return encodeBlock(bytes[0], bytes[1])
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case 3:
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return encodeBlock(bytes[0], bytes[1], bytes[2])
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case 4:
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return encodeBlock(bytes[0], bytes[1], bytes[2], bytes[3])
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case 5:
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return encodeBlock(bytes[0], bytes[1], bytes[2], bytes[3], bytes[4])
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default:
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fatalError("Cannot encode \(bytes.count) bytes. Max block size is five.")
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}
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}
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private func encodeBlock(_ b0: Byte, _ b1: Byte, _ b2: Byte, _ b3: Byte, _ b4: Byte) -> EncodedBlock {
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let q = quintetsFromBytes(b0, b1, b2, b3, b4)
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let c0 = character(encoding: q.0)
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let c1 = character(encoding: q.1)
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let c2 = character(encoding: q.2)
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let c3 = character(encoding: q.3)
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let c4 = character(encoding: q.4)
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let c5 = character(encoding: q.5)
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let c6 = character(encoding: q.6)
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let c7 = character(encoding: q.7)
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return (c0, c1, c2, c3, c4, c5, c6, c7)
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}
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private func encodeBlock(_ b0: Byte, _ b1: Byte, _ b2: Byte, _ b3: Byte) -> EncodedBlock {
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let q = quintetsFromBytes(b0, b1, b2, b3)
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let c0 = character(encoding: q.0)
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let c1 = character(encoding: q.1)
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let c2 = character(encoding: q.2)
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let c3 = character(encoding: q.3)
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let c4 = character(encoding: q.4)
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let c5 = character(encoding: q.5)
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let c6 = character(encoding: q.6)
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let c7 = paddingCharacter
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return (c0, c1, c2, c3, c4, c5, c6, c7)
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}
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private func encodeBlock(_ b0: Byte, _ b1: Byte, _ b2: Byte) -> EncodedBlock {
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let q = quintetsFromBytes(b0, b1, b2)
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let c0 = character(encoding: q.0)
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let c1 = character(encoding: q.1)
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let c2 = character(encoding: q.2)
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let c3 = character(encoding: q.3)
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let c4 = character(encoding: q.4)
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let c5 = paddingCharacter
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let c6 = paddingCharacter
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let c7 = paddingCharacter
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return (c0, c1, c2, c3, c4, c5, c6, c7)
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}
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private func encodeBlock(_ b0: Byte, _ b1: Byte) -> EncodedBlock {
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let q = quintetsFromBytes(b0, b1)
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let c0 = character(encoding: q.0)
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let c1 = character(encoding: q.1)
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let c2 = character(encoding: q.2)
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let c3 = character(encoding: q.3)
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let c4 = paddingCharacter
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let c5 = paddingCharacter
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let c6 = paddingCharacter
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let c7 = paddingCharacter
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return (c0, c1, c2, c3, c4, c5, c6, c7)
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}
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private func encodeBlock(_ b0: Byte) -> EncodedBlock {
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let q = quintetsFromBytes(b0)
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let c0 = character(encoding: q.0)
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let c1 = character(encoding: q.1)
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let c2 = paddingCharacter
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let c3 = paddingCharacter
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let c4 = paddingCharacter
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let c5 = paddingCharacter
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let c6 = paddingCharacter
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let c7 = paddingCharacter
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return (c0, c1, c2, c3, c4, c5, c6, c7)
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}
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