89 lines
3.0 KiB
C#
89 lines
3.0 KiB
C#
// Copyright (C) 2013, The Duplicati Team
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// http://www.duplicati.com, info@duplicati.com
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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using System;
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using System.Collections.Generic;
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namespace Duplicati.Library.Main
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{
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/// <summary>
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/// Lookup table for hashes
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/// </summary>
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public class HashLookupHelper<T>
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{
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/// <summary>
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/// The lookup table
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/// </summary>
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private readonly SortedList<string, T>[] m_lookup;
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/// <summary>
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/// The number of entries in the table
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/// </summary>
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private readonly ulong m_entries;
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/// <summary>
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/// Initializes a new instance of the <see cref="Duplicati.Library.Main.HashLookupHelper{T}"/> class.
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/// </summary>
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/// <param name="maxmemory">The maximum amount of bytes to use for the lookup table</param>
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public HashLookupHelper (ulong maxmemory)
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{
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m_entries = Math.Max(16, maxmemory / (ulong)IntPtr.Size);
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m_lookup = new SortedList<string, T>[m_entries];
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}
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/// <summary>
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/// Hex digit ASCII lookup table
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/// </summary>
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private static readonly byte[] HEXTB = new byte[128];
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/// <summary>
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/// Base64 digit ASCII lookup table
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/// </summary>
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private static readonly byte[] BAS64TB = new byte[128];
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/// <summary>
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/// Initializes the lookup
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/// </summary>
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static HashLookupHelper()
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{
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for(byte i = 0; i < 10; i++)
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HEXTB['0' + i] = i;
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for (byte i = 0; i < 6; i++)
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{
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//Case insensitive support
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HEXTB['A' + i] = (byte)(i + 10);
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HEXTB['a' + i] = (byte)(i + 10);
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}
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for (byte i = 0; i < 26; i++)
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BAS64TB['A' + i] = i;
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for (byte i = 0; i < 26; i++)
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BAS64TB['a' + i] = (byte)(i + 26);
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for (byte i = 0; i < 10; i++)
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BAS64TB['0' + i] = (byte)(i + 52);
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BAS64TB['+'] = 62;
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BAS64TB['/'] = 63;
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//Base64 URL support
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BAS64TB['-'] = 62;
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BAS64TB['_'] = 63;
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}
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}
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}
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