Road to v1 begins!

NTwain/Internals/WinMemoryManager.cs

@@ -0,0 +1,39 @@
+using NTwain.Data;
+using NTwain.Internals;
+using System;
+
+namespace NTwain
+{
+    /// <summary>
+    /// Provides methods for managing memory on data exchanged with twain sources using old win32 methods.
+    /// This should only be used after the DSM has been opened.
+    /// </summary>
+    class WinMemoryManager : IMemoryManager
+    {
+        public IntPtr Allocate(uint size)
+        {
+            IntPtr retVal = NativeMethods.WinGlobalAlloc(0x0040, new UIntPtr(size));
+
+            if (retVal == IntPtr.Zero)
+            {
+                throw new OutOfMemoryException();
+            }
+            return retVal;
+        }
+
+        public void Free(IntPtr handle)
+        {
+            NativeMethods.WinGlobalFree(handle);
+        }
+
+        public IntPtr Lock(IntPtr handle)
+        {
+            return NativeMethods.WinGlobalLock(handle);
+        }
+
+        public void Unlock(IntPtr handle)
+        {
+            NativeMethods.WinGlobalUnlock(handle);
+        }
+    }
+}