48 lines
1.0 KiB
C#
48 lines
1.0 KiB
C#
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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 - 2015 Jb Evain
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// Copyright (c) 2008 - 2011 Novell, Inc.
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//
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// Licensed under the MIT/X11 license.
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//
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using System.Collections.Generic;
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namespace MonoFN.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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// See http://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function
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const int fnv_offset_bias = unchecked((int)2166136261);
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const int fnv_prime = 16777619;
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var hash_code = fnv_offset_bias;
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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_code = unchecked((hash_code ^ bytes [i]) * fnv_prime);
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return hash_code;
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}
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}
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}
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