/**

 * 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 ... */