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Added CopyTo extension that specifies a start offset.

pull/60/head
David Hall 2019-05-08 09:23:04 -06:00
parent 0aacc9ff30
commit 0ff50e3291
1 changed files with 16 additions and 5 deletions
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21
Core/Extensions/InteropExtensions.cs
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@ -15,12 +15,23 @@ namespace Vanara.Extensions
/// <param name="ptr">The allocated memory pointer.</param>
/// <param name="dest">The allocated memory pointer to copy to.</param>
/// <param name="length">The number of bytes to copy from <paramref name="ptr"/> to <paramref name="dest"/>.</param>
public static unsafe void CopyTo(this IntPtr ptr, IntPtr dest, long length)
public static void CopyTo(this IntPtr ptr, IntPtr dest, long length) => CopyTo(ptr, 0L, dest, length);
/// <summary>Copies the number of specified bytes from one unmanaged memory block to another.</summary>
/// <param name="source">The allocated memory pointer.</param>
/// <param name="start">The offset from <paramref name="source"/> at which to start the copying.</param>
/// <param name="dest">The allocated memory pointer to copy to.</param>
/// <param name="length">The number of bytes to copy from <paramref name="source"/> to <paramref name="dest"/>.</param>
public static void CopyTo(this IntPtr source, long start, IntPtr dest, long length)
{
var psrc = (byte*)ptr;
var pdest = (byte*)dest;
for (var i = 0; i < length; i++, psrc++, pdest++)
*pdest = *psrc;
if (start < 0 || length < 0) throw new ArgumentOutOfRangeException();
if (source == IntPtr.Zero || dest == IntPtr.Zero) throw new ArgumentNullException();
unsafe
{
byte* psrc = (byte*)source + start, pdest = (byte*)dest;
for (long i = 0; i < length; i++, psrc++, pdest++)
*pdest = *psrc;
}
}
/// <summary>