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124 lines
3.8 KiB
C#
124 lines
3.8 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Threading;
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namespace MonoTorrent
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{
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public delegate long Operation<T>(T target);
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public static class Toolbox
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{
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private static Random r = new Random();
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public static int Count<T>(IEnumerable<T> enumerable, Predicate<T> predicate)
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{
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int count = 0;
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foreach (T t in enumerable)
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if (predicate(t))
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count++;
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return count;
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}
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public static long Accumulate<T>(IEnumerable<T> enumerable, Operation<T> action)
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{
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long count = 0;
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foreach (T t in enumerable)
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count += action(t);
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return count;
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}
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public static void RaiseAsyncEvent<T>(EventHandler<T> e, object o, T args)
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where T : EventArgs
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{
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if (e == null)
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return;
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ThreadPool.QueueUserWorkItem(delegate {
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if (e != null)
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e(o, args);
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});
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}
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/// <summary>
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/// Randomizes the contents of the array
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="array"></param>
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public static void Randomize<T>(List<T> array)
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{
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List<T> clone = new List<T>(array);
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array.Clear();
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while (clone.Count > 0)
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{
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int index = r.Next(0, clone.Count);
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array.Add(clone[index]);
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clone.RemoveAt(index);
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}
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}
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/// <summary>
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/// Switches the positions of two elements in an array
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/// </summary>
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/// <typeparam name="T"></typeparam>
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/// <param name="array"></param>
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/// <param name="first"></param>
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/// <param name="second"></param>
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public static void Switch<T>(IList<T> array, int first, int second)
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{
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T obj = array[first];
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array[first] = array[second];
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array[second] = obj;
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}
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/// <summary>
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/// Checks to see if the contents of two byte arrays are equal
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/// </summary>
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/// <param name="array1">The first array</param>
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/// <param name="array2">The second array</param>
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/// <returns>True if the arrays are equal, false if they aren't</returns>
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public static bool ByteMatch(byte[] array1, byte[] array2)
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{
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if (array1 == null)
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throw new ArgumentNullException("array1");
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if (array2 == null)
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throw new ArgumentNullException("array2");
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if (array1.Length != array2.Length)
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return false;
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return ByteMatch(array1, 0, array2, 0, array1.Length);
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}
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/// <summary>
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/// Checks to see if the contents of two byte arrays are equal
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/// </summary>
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/// <param name="array1">The first array</param>
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/// <param name="array2">The second array</param>
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/// <param name="offset1">The starting index for the first array</param>
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/// <param name="offset2">The starting index for the second array</param>
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/// <param name="count">The number of bytes to check</param>
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/// <returns></returns>
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public static bool ByteMatch(byte[] array1, int offset1, byte[] array2, int offset2, int count)
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{
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if (array1 == null)
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throw new ArgumentNullException("array1");
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if (array2 == null)
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throw new ArgumentNullException("array2");
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// If either of the arrays is too small, they're not equal
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if ((array1.Length - offset1) < count || (array2.Length - offset2) < count)
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return false;
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// Check if any elements are unequal
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for (int i = 0; i < count; i++)
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if (array1[offset1 + i] != array2[offset2 + i])
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return false;
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return true;
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}
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}
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}
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