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//
// ArraySegment.cs
//
// Authors:
// Ben Maurer (bmaurer@ximian.com)
// Jensen Somers <jensen.somers@gmail.com>
//
// Copyright (C) 2004 Novell
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
#if NET_2_0
namespace System {
[Serializable]
public struct ArraySegment <T> {
T [] array;
int offset, count;
public ArraySegment (T [] array, int offset, int count)
{
if (array == null)
throw new ArgumentNullException ("array");
if (offset < 0)
throw new ArgumentOutOfRangeException ("offset", "Non-negative number required.");
if (count < 0)
throw new ArgumentOutOfRangeException ("count", "Non-negative number required.");
if (offset > array.Length)
throw new ArgumentException ("out of bounds");
// now offset is valid, or just beyond the end.
// Check count -- do it this way to avoid overflow on 'offset + count'
if (array.Length - offset < count)
throw new ArgumentException ("out of bounds", "offset");
this.array = array;
this.offset = offset;
this.count = count;
}
public ArraySegment (T [] array)
{
if (array == null)
throw new ArgumentNullException ("array");
this.array = array;
this.offset = 0;
this.count = array.Length;
}
public T [] Array {
get { return array; }
}
public int Offset {
get { return offset; }
}
public int Count {
get { return count; }
}
public override bool Equals (Object obj)
{
if (obj is ArraySegment<T>) {
return this.Equals((ArraySegment<T>) obj);
}
return false;
}
public bool Equals (ArraySegment<T> obj)
{
if ((this.array == obj.Array) && (this.offset == obj.Offset) && (this.count == obj.Count))
return true;
return false;
}
public override int GetHashCode ()
{
return ((this.array.GetHashCode() ^ this.offset) ^ this.count);
}
public static bool operator ==(ArraySegment<T> a, ArraySegment<T> b)
{
return a.Equals(b);
}
public static bool operator !=(ArraySegment<T> a, ArraySegment<T> b)
{
return !(a.Equals(b));
}
}
}
#endif
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