79 lines
2.1 KiB
C#
79 lines
2.1 KiB
C#
//
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// ByteBufferEqualityComparer.cs
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//
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// Author:
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// Jb Evain (jbevain@gmail.com)
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//
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// Copyright (c) 2008 - 2011 Jb Evain
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all 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,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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namespace Mono.Cecil.PE {
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sealed class ByteBufferEqualityComparer : IEqualityComparer<ByteBuffer> {
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public bool Equals (ByteBuffer x, ByteBuffer y)
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{
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if (x.length != y.length)
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return false;
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var x_buffer = x.buffer;
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var y_buffer = y.buffer;
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for (int i = 0; i < x.length; i++)
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if (x_buffer [i] != y_buffer [i])
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return false;
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return true;
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}
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public int GetHashCode (ByteBuffer buffer)
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{
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#if !BYTE_BUFFER_WELL_DISTRIBUTED_HASH
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var hash = 0;
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var bytes = buffer.buffer;
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for (int i = 0; i < buffer.length; i++)
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hash = (hash * 37) ^ bytes [i];
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return hash;
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#else
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const uint p = 16777619;
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uint hash = 2166136261;
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var bytes = buffer.buffer;
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for (int i = 0; i < buffer.length; i++)
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hash = (hash ^ bytes [i]) * p;
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hash += hash << 13;
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hash ^= hash >> 7;
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hash += hash << 3;
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hash ^= hash >> 17;
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hash += hash << 5;
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return (int) hash;
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#endif
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}
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}
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}
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