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//
// System.Buffer.cs
//
// Authors:
// Paolo Molaro (lupus@ximian.com)
// Dan Lewis (dihlewis@yahoo.co.uk)
//
// (C) 2001 Ximian, Inc. http://www.ximian.com
//
//
// Copyright (C) 2004 Novell, Inc (http://www.novell.com)
//
// 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.
//
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
namespace System {
#if NET_2_0
[ComVisible (true)]
#endif
public
#if NET_2_0
static
#else
sealed
#endif
class Buffer {
#if !NET_2_0
private Buffer ()
{
}
#endif
public static int ByteLength (Array array)
{
// note: the other methods in this class also use ByteLength to test for
// null and non-primitive arguments as a side-effect.
if (array == null)
throw new ArgumentNullException ("array");
int length = ByteLengthInternal (array);
if (length < 0)
throw new ArgumentException (Locale.GetText ("Object must be an array of primitives."));
return length;
}
public static byte GetByte (Array array, int index)
{
if (index < 0 || index >= ByteLength (array))
throw new ArgumentOutOfRangeException ("index", Locale.GetText(
"Value must be non-negative and less than the size of the collection."));
return GetByteInternal (array, index);
}
public static void SetByte (Array array, int index, byte value)
{
if (index < 0 || index >= ByteLength (array))
throw new ArgumentOutOfRangeException ("index", Locale.GetText(
"Value must be non-negative and less than the size of the collection."));
SetByteInternal (array, index, value);
}
public static void BlockCopy (Array src, int srcOffset, Array dst, int dstOffset, int count)
{
if (src == null)
throw new ArgumentNullException ("src");
if (dst == null)
throw new ArgumentNullException ("dst");
if (srcOffset < 0)
throw new ArgumentOutOfRangeException ("srcOffset", Locale.GetText(
"Non-negative number required."));
if (dstOffset < 0)
throw new ArgumentOutOfRangeException ("dstOffset", Locale.GetText (
"Non-negative number required."));
if (count < 0)
throw new ArgumentOutOfRangeException ("count", Locale.GetText (
"Non-negative number required."));
// We do the checks in unmanaged code for performance reasons
bool res = BlockCopyInternal (src, srcOffset, dst, dstOffset, count);
if (!res) {
// watch for integer overflow
if ((srcOffset > ByteLength (src) - count) || (dstOffset > ByteLength (dst) - count))
throw new ArgumentException (Locale.GetText (
"Offset and length were out of bounds for the array or count is greater than " +
"the number of elements from index to the end of the source collection."));
}
}
// private
[MethodImplAttribute (MethodImplOptions.InternalCall)]
private extern static int ByteLengthInternal (Array array);
[MethodImplAttribute (MethodImplOptions.InternalCall)]
private extern static byte GetByteInternal (Array array, int index);
[MethodImplAttribute (MethodImplOptions.InternalCall)]
private extern static void SetByteInternal (Array array, int index, int value);
[MethodImplAttribute (MethodImplOptions.InternalCall)]
internal extern static bool BlockCopyInternal (Array src, int src_offset, Array dest, int dest_offset, int count);
}
}
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