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Lidarr/src/MonoTorrent/ToolBox.cs

124 lines
3.8 KiB

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