mirror of
https://github.com/ZDoom/gzdoom-gles.git
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96d328de9b
For some files that had the Doom Source license attached but saw heavy external contributions over the years I added a special note to license all original ZDoom code under BSD.
219 lines
4 KiB
C
219 lines
4 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 __M_SWAP_H__
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#define __M_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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inline short LittleShort(short x)
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{
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return (short)OSSwapLittleToHostInt16((uint16_t)x);
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}
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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 short LittleShort(int x)
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{
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return OSSwapLittleToHostInt16((uint16_t)x);
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}
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inline unsigned short LittleShort(unsigned int x)
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{
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return OSSwapLittleToHostInt16((uint16_t)x);
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}
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inline int LittleLong(int x)
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{
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return OSSwapLittleToHostInt32((uint32_t)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 int LittleLong(long x)
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{
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return OSSwapLittleToHostInt32((uint32_t)x);
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}
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inline unsigned int LittleLong(unsigned long x)
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{
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return OSSwapLittleToHostInt32((uint32_t)x);
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}
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inline short BigShort(short x)
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{
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return (short)OSSwapBigToHostInt16((uint16_t)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 int BigLong(int x)
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{
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return OSSwapBigToHostInt32((uint32_t)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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#else
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#ifdef __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 short LittleShort (short x)
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{
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return (short)((((unsigned short)x)>>8) | (((unsigned short)x)<<8));
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}
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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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// Swapping 32bit.
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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 int LittleLong (int x)
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{
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return (int)(
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(((unsigned int)x)>>24)
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| ((((unsigned int)x)>>8) & 0xff00)
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| ((((unsigned int)x)<<8) & 0xff0000)
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| (((unsigned int)x)<<24));
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}
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#define BigShort(x) (x)
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#define BigLong(x) (x)
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#else
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#define LittleShort(x) (x)
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#define LittleLong(x) (x)
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#if defined(_MSC_VER)
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inline short BigShort (short x)
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{
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return (short)_byteswap_ushort((unsigned short)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 _byteswap_ushort(x);
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}
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inline int BigLong (int x)
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{
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return (int)_byteswap_ulong((unsigned long)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 short BigShort (short x)
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{
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return (short)((((unsigned short)x)>>8) | (((unsigned short)x)<<8));
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}
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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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inline int BigLong (int x)
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{
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return (int)(
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(((unsigned int)x)>>24)
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| ((((unsigned int)x)>>8) & 0xff00)
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| ((((unsigned int)x)<<8) & 0xff0000)
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| (((unsigned int)x)<<24));
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}
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#endif
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#endif // __BIG_ENDIAN__
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#endif // __APPLE__
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// Data accessors, since some data is highly likely to be unaligned.
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#if defined(_M_IX86) || defined(_M_X64) || defined(__i386__)
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inline int GetShort(const unsigned char *foo)
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{
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return *(const short *)foo;
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}
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inline int GetInt(const unsigned char *foo)
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{
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return *(const int *)foo;
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}
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inline int GetBigInt(const unsigned char *foo)
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{
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return BigLong(GetInt(foo));
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}
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#else
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inline int GetShort(const unsigned char *foo)
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{
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return short(foo[0] | (foo[1] << 8));
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}
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inline int GetInt(const unsigned char *foo)
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{
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return int(foo[0] | (foo[1] << 8) | (foo[2] << 16) | (foo[3] << 24));
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}
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inline int GetBigInt(const unsigned char *foo)
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{
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return int((foo[0] << 24) | (foo[1] << 16) | (foo[2] << 8) | foo[3]);
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}
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#endif
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#ifdef __BIG_ENDIAN__
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inline int GetNativeInt(const unsigned char *foo)
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{
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return GetBigInt(foo);
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}
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#else
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inline int GetNativeInt(const unsigned char *foo)
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{
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return GetInt(foo);
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}
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#endif
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#endif // __M_SWAP_H__
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