adding endian routines i wrote independently; maybe it's useful, and less clutter in cvs ;)

This was SVN commit r237.

source/lib/endian.cpp

@@ -0,0 +1,40 @@
+#include "precompiled.h"
+
+// don't need to implement on VC - header maps bswap* to instrinsics
+#ifndef _MSC_VER
+
+u16 bswap16(u16 x)
+{
+	return (u16)(((x & 0xff) << 8) | (x >> 8));
+}
+
+
+u32 bswap32(u32 x)
+{
+	u32 t = x;
+
+	for(int i = 0; i < 4; i++)
+	{
+		x <<= 8;
+		x |= t & 0xff;
+	}
+
+	return x;
+}
+
+
+u64 bswap64(u64 x)
+{
+	u64 t = x;
+
+	for(int i = 0; i < 8; i++)
+	{
+		x <<= 8;
+		x |= t & 0xff;
+	}
+
+	return x;
+}
+
+
+#endif	// #ifndef _MSC_VER

source/lib/endian.h

@@ -0,0 +1,17 @@
+// map to intrinsics on VC
+#ifdef _MSC_VER
+
+#include <stdlib.h>
+
+#define bswap16 _byteswap_ushort
+#define bswap32 _byteswap_ulong
+#define bswap64 _byteswap_uint64
+
+// otherwise, define our own functions
+#else
+
+extern u16 bswap16(u16);
+extern u32 bswap32(u32);
+extern u64 bswap64(u64);
+
+#endif