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#region Copyright notice and license
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
#endregion
using System;
namespace Google.Protobuf
{
/// <summary>
/// Provides a utility routine to copy small arrays much more quickly than Buffer.BlockCopy
/// </summary>
internal static class ByteArray
{
/// <summary>
/// The threshold above which you should use Buffer.BlockCopy rather than ByteArray.Copy
/// </summary>
private const int CopyThreshold = 12;
/// <summary>
/// Determines which copy routine to use based on the number of bytes to be copied.
/// </summary>
internal static void Copy(byte[] src, int srcOffset, byte[] dst, int dstOffset, int count)
{
if (count > CopyThreshold)
{
Buffer.BlockCopy(src, srcOffset, dst, dstOffset, count);
}
else
{
int stop = srcOffset + count;
for (int i = srcOffset; i < stop; i++)
{
dst[dstOffset++] = src[i];
}
}
}
/// <summary>
/// Reverses the order of bytes in the array
/// </summary>
internal static void Reverse(byte[] bytes)
{
for (int first = 0, last = bytes.Length - 1; first < last; first++, last--)
{
byte temp = bytes[first];
bytes[first] = bytes[last];
bytes[last] = temp;
}
}
}
}