Add TrueCrypt 7.1a MacOSX/Linux specific source files.

src/Volume/Crc32.h

@@ -0,0 +1,44 @@
+/*
+ Copyright (c) 2008 TrueCrypt Developers Association. All rights reserved.
+
+ Governed by the TrueCrypt License 3.0 the full text of which is contained in
+ the file License.txt included in TrueCrypt binary and source code distribution
+ packages.
+*/
+
+#ifndef TC_HEADER_Encryption_Crc32
+#define TC_HEADER_Encryption_Crc32
+
+#include "Platform/Platform.h"
+#include "Common/Crc.h"
+
+namespace TrueCrypt
+{
+	class Crc32
+	{
+	public:
+		Crc32 () : CrcValue (0xffffFFFF) { };
+		virtual ~Crc32 () { };
+
+		uint32 Get () const { return CrcValue ^ 0xffffFFFF; }
+
+		uint32 Process (byte data)
+		{
+			return CrcValue = crc_32_tab[(byte) (CrcValue ^ data)] ^ (CrcValue >> 8);
+		}
+
+		static uint32 ProcessBuffer (const ConstBufferPtr &buffer)
+		{
+			return ::GetCrc32 (const_cast<byte *> (buffer.Get()), static_cast<int> (buffer.Size()));
+		}
+
+	protected:
+		uint32 CrcValue;
+
+	private:
+		Crc32 (const Crc32 &);
+		Crc32 &operator= (const Crc32 &);
+	};
+}
+
+#endif // TC_HEADER_Encryption_Crc32