113 lines
3.2 KiB
C#
113 lines
3.2 KiB
C#
#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
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#pragma warning disable
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using System;
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using System.Collections.Generic;
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namespace BestHTTP.SecureProtocol.Org.BouncyCastle.Crypto.Utilities
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{
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/**
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* A basic alphabet mapper that just creates a mapper based on the
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* passed in array of characters.
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*/
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public class BasicAlphabetMapper
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: IAlphabetMapper
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{
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private readonly IDictionary<char, int> m_indexMap = new Dictionary<char, int>();
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private readonly IList<char> m_charMap = new List<char>();
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/**
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* Base constructor.
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*
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* @param alphabet a string of characters making up the alphabet.
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*/
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public BasicAlphabetMapper(string alphabet) :
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this(alphabet.ToCharArray())
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{
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}
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/**
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* Base constructor.
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*
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* @param alphabet an array of characters making up the alphabet.
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*/
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public BasicAlphabetMapper(char[] alphabet)
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{
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for (int i = 0; i != alphabet.Length; i++)
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{
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if (m_indexMap.ContainsKey(alphabet[i]))
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throw new ArgumentException("duplicate key detected in alphabet: " + alphabet[i]);
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m_indexMap.Add(alphabet[i], i);
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m_charMap.Add(alphabet[i]);
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}
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}
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public int Radix
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{
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get { return m_charMap.Count; }
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}
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public byte[] ConvertToIndexes(char[] input)
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{
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byte[] outBuf;
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if (m_charMap.Count <= 256)
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{
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outBuf = new byte[input.Length];
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for (int i = 0; i != input.Length; i++)
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{
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if (!m_indexMap.TryGetValue(input[i], out var idx))
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throw new InvalidOperationException();
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outBuf[i] = (byte)idx;
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}
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}
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else
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{
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outBuf = new byte[input.Length * 2];
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for (int i = 0; i != input.Length; i++)
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{
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if (!m_indexMap.TryGetValue(input[i], out var idx))
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throw new InvalidOperationException();
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outBuf[i * 2 + 0] = (byte)(idx >> 8);
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outBuf[i * 2 + 1] = (byte)idx;
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}
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}
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return outBuf;
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}
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public char[] ConvertToChars(byte[] input)
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{
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char[] outBuf;
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if (m_charMap.Count <= 256)
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{
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outBuf = new char[input.Length];
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for (int i = 0; i != input.Length; i++)
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{
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outBuf[i] = m_charMap[input[i]];
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}
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}
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else
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{
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if ((input.Length & 0x1) != 0)
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{
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throw new ArgumentException("two byte radix and input string odd.Length");
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}
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outBuf = new char[input.Length / 2];
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for (int i = 0; i != input.Length; i += 2)
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{
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outBuf[i / 2] = m_charMap[(input[i] << 8) | input[i + 1]];
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}
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}
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return outBuf;
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}
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}
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}
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#pragma warning restore
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#endif
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