mirror of
https://github.com/ZDoom/Raze.git
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122 lines
1.9 KiB
C++
122 lines
1.9 KiB
C++
//
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// DESCRIPTION:
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// Endianess handling, swapping 16bit and 32bit.
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//
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//-----------------------------------------------------------------------------
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#ifndef __FS_SWAP_H__
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#define __FS_SWAP_H__
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#include <stdlib.h>
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// Endianess handling.
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// WAD files are stored little endian.
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#ifdef __APPLE__
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#include <libkern/OSByteOrder.h>
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#endif
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namespace FileSys {
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namespace byteswap {
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#ifdef __APPLE__
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inline unsigned short LittleShort(unsigned short x)
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{
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return OSSwapLittleToHostInt16(x);
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}
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inline unsigned int LittleLong(unsigned int x)
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{
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return OSSwapLittleToHostInt32(x);
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}
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inline unsigned short BigShort(unsigned short x)
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{
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return OSSwapBigToHostInt16(x);
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}
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inline unsigned int BigLong(unsigned int x)
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{
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return OSSwapBigToHostInt32(x);
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}
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#elif defined __BIG_ENDIAN__
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// Swap 16bit, that is, MSB and LSB byte.
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// No masking with 0xFF should be necessary.
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inline unsigned short LittleShort (unsigned short x)
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{
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return (unsigned short)((x>>8) | (x<<8));
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}
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inline unsigned int LittleLong (unsigned int x)
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{
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return (unsigned int)(
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(x>>24)
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| ((x>>8) & 0xff00)
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| ((x<<8) & 0xff0000)
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| (x<<24));
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}
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inline unsigned short BigShort(unsigned short x)
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{
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return x;
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}
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inline unsigned int BigLong(unsigned int x)
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{
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return x;
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}
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#else
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inline unsigned short LittleShort(unsigned short x)
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{
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return x;
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}
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inline unsigned int LittleLong(unsigned int x)
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{
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return x;
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}
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#ifdef _MSC_VER
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inline unsigned short BigShort(unsigned short x)
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{
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return _byteswap_ushort(x);
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}
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inline unsigned int BigLong(unsigned int x)
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{
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return (unsigned int)_byteswap_ulong((unsigned long)x);
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}
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#pragma warning (default: 4035)
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#else
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inline unsigned short BigShort (unsigned short x)
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{
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return (unsigned short)((x>>8) | (x<<8));
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}
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inline unsigned int BigLong (unsigned int x)
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{
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return (unsigned int)(
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(x>>24)
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| ((x>>8) & 0xff00)
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| ((x<<8) & 0xff0000)
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| (x<<24));
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}
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#endif
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#endif // __BIG_ENDIAN__
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}
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}
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#endif // __M_SWAP_H__
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