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namespace Google.ProtocolBuffers
{
/// <summary>
/// Provides a utility routine to copy small arrays much more quickly than Buffer.BlockCopy
/// </summary>
static class Bytes
{
/// <summary>
/// The threshold above which you should use Buffer.BlockCopy rather than Bytes.Copy
/// </summary>
const int CopyThreshold = 12;
/// <summary>
/// Determines which copy routine to use based on the number of bytes to be copied.
/// </summary>
public static void Copy(byte[] src, int srcOffset, byte[] dst, int dstOffset, int count)
{
if (count > CopyThreshold)
global::System.Buffer.BlockCopy(src, srcOffset, dst, dstOffset, count);
else
ByteCopy(src, srcOffset, dst, dstOffset, count);
}
/// <summary>
/// Copyies the bytes provided with a for loop, faster when there are only a few bytes to copy
/// </summary>
public static void ByteCopy(byte[] src, int srcOffset, byte[] dst, int dstOffset, int count)
{
int stop = srcOffset + count;
for (int i = srcOffset; i < stop; i++)
dst[dstOffset++] = src[i];
}
}
}
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