Memory Copy - CSharp System

CSharp examples for System:Byte

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Description

Memory Copy

Demo Code

/* Copyright (c) 2006-2008, Peter Golde
 * All rights reserved./* w w w.  j av a  2 s.c o m*/
 * 
 * Redistribution and use in source and binary forms, with or without 
 * modification, are permitted provided that the following conditions are 
 * met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 * 
 * 2. Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 * 
 * 3. Neither the name of Peter Golde, nor "Purple Pen", nor the names
 * of its contributors may be used to endorse or promote products
 * derived from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
 * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 */
using System.Drawing.Drawing2D;
using System.Drawing.Imaging;
using System.Drawing;
using System.Diagnostics;
using System;

public class Main{
        unsafe static void MemCopy(byte * dest, byte * src, int size) {
         if (dest > src && dest - src < size) {
            // If we overlap, copy backwards.
            dest += size;
            src += size;

            // copy first part
            while (size > 0 && ((int)src & 4) != 0) {
               *--dest = *--src;
               --size;
            }

            // Copy main part one int at a time.
            while (size >= sizeof(int)) {
               dest -= sizeof(int);
               src -= sizeof(int);
               *(int *)dest = *(int *)src;
               size -= sizeof(int);
            }

            // Copy last part
            while (size > 0 ) {
               *--dest = *--src;
               --size;
            }
         }
         else {
            // Copy first part
            while (size > 0 && ((int)src & 4) != 0) {
               *dest++ = *src++;
               --size;
            }

            // Copy main part one int at a time.
            while (size >= sizeof(int)) {
               *(int *)dest = *(int *)src;
               dest += sizeof(int);
               src += sizeof(int);
               size -= sizeof(int);
            }

            // Copy last part
            while (size > 0) {
               *dest++ = *src++;
               --size;
            }
         }
      }
}

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