physfs_byteorder.c
changeset 177 9aaf01f4b8ec
child 194 09c353d30cd4
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/physfs_byteorder.c	Fri Apr 05 18:10:02 2002 +0000
@@ -0,0 +1,114 @@
+/**
+ * PhysicsFS; a portable, flexible file i/o abstraction.
+ *
+ * Documentation is in physfs.h. It's verbose, honest.  :)
+ *
+ * Please see the file LICENSE in the source's root directory.
+ *
+ *  This file written by Ryan C. Gordon.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include "physfs.h"
+
+/* This byteorder stuff was lifted from SDL. http://www.libsdl.org/ */
+#define PHYSFS_LIL_ENDIAN  1234
+#define PHYSFS_BIG_ENDIAN  4321
+
+#if  defined(__i386__) || defined(__ia64__) || defined(WIN32) || \
+    (defined(__alpha__) || defined(__alpha)) || \
+     defined(__arm__) || \
+    (defined(__mips__) && defined(__MIPSEL__)) || \
+     defined(__SYMBIAN32__) || \
+     defined(__LITTLE_ENDIAN__)
+#define PHYSFS_BYTEORDER    PHYSFS_LIL_ENDIAN
+#else
+#define PHYSFS_BYTEORDER    PHYSFS_BIG_ENDIAN
+#endif
+
+
+/* The macros used to swap values */
+/* Try to use superfast macros on systems that support them */
+#ifdef linux
+#include <asm/byteorder.h>
+#ifdef __arch__swab16
+#define PHYSFS_Swap16  __arch__swab16
+#endif
+#ifdef __arch__swab32
+#define PHYSFS_Swap32  __arch__swab32
+#endif
+#endif /* linux */
+
+#ifndef PHYSFS_Swap16
+static __inline__ PHYSFS_uint16 PHYSFS_Swap16(PHYSFS_uint16 D)
+{
+	return((D<<8)|(D>>8));
+}
+#endif
+#ifndef PHYSFS_Swap32
+static __inline__ PHYSFS_uint32 PHYSFS_Swap32(PHYSFS_uint32 D)
+{
+	return((D<<24)|((D<<8)&0x00FF0000)|((D>>8)&0x0000FF00)|(D>>24));
+}
+#endif
+#ifndef PHYSFS_NO_64BIT_SUPPORT
+#ifndef PHYSFS_Swap64
+static __inline__ PHYSFS_uint64 PHYSFS_Swap64(PHYSFS_uint64 val) {
+	PHYSFS_uint32 hi, lo;
+
+	/* Separate into high and low 32-bit values and swap them */
+	lo = (PHYSFS_uint32)(val&0xFFFFFFFF);
+	val >>= 32;
+	hi = (PHYSFS_uint32)(val&0xFFFFFFFF);
+	val = PHYSFS_Swap32(lo);
+	val <<= 32;
+	val |= PHYSFS_Swap32(hi);
+	return(val);
+}
+#endif
+#else
+#ifndef PHYSFS_Swap64
+/* This is mainly to keep compilers from complaining in PHYSFS code.
+   If there is no real 64-bit datatype, then compilers will complain about
+   the fake 64-bit datatype that PHYSFS provides when it compiles user code.
+*/
+#define PHYSFS_Swap64(X)	(X)
+#endif
+#endif /* PHYSFS_NO_64BIT_SUPPORT */
+
+
+/* Byteswap item from the specified endianness to the native endianness */
+#if PHYSFS_BYTEORDER == PHYSFS_LIL_ENDIAN
+PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 x) { return(x); }
+PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 x) { return(x); }
+PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 x) { return(x); }
+PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 x) { return(x); }
+PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 x) { return(x); }
+PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 x) { return(x); }
+
+PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 x) { return(PHYSFS_Swap16(x)); }
+PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 x) { return(PHYSFS_Swap16(x)); }
+PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 x) { return(PHYSFS_Swap32(x)); }
+PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 x) { return(PHYSFS_Swap32(x)); }
+PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 x) { return(PHYSFS_Swap64(x)); }
+PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 x) { return(PHYSFS_Swap64(x)); }
+#else
+PHYSFS_uint16 PHYSFS_swapULE16(PHYSFS_uint16 x) { return(PHYSFS_Swap16(x)); }
+PHYSFS_sint16 PHYSFS_swapSLE16(PHYSFS_sint16 x) { return(PHYSFS_Swap16(x)); }
+PHYSFS_uint32 PHYSFS_swapULE32(PHYSFS_uint32 x) { return(PHYSFS_Swap32(x)); }
+PHYSFS_sint32 PHYSFS_swapSLE32(PHYSFS_sint32 x) { return(PHYSFS_Swap32(x)); }
+PHYSFS_uint64 PHYSFS_swapULE64(PHYSFS_uint64 x) { return(PHYSFS_Swap64(x)); }
+PHYSFS_sint64 PHYSFS_swapSLE64(PHYSFS_sint64 x) { return(PHYSFS_Swap64(x)); }
+
+PHYSFS_uint16 PHYSFS_swapUBE16(PHYSFS_uint16 x) { return(x); }
+PHYSFS_sint16 PHYSFS_swapSBE16(PHYSFS_sint16 x) { return(x); }
+PHYSFS_uint32 PHYSFS_swapUBE32(PHYSFS_uint32 x) { return(x); }
+PHYSFS_sint32 PHYSFS_swapSBE32(PHYSFS_sint32 x) { return(x); }
+PHYSFS_uint64 PHYSFS_swapUBE64(PHYSFS_uint64 x) { return(x); }
+PHYSFS_sint64 PHYSFS_swapSBE64(PHYSFS_sint64 x) { return(x); }
+#endif
+
+/* end of physfs_byteorder.c ... */
+