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Diffstat (limited to 'src/endian_uqm.h')
| -rw-r--r-- | src/endian_uqm.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/src/endian_uqm.h b/src/endian_uqm.h new file mode 100644 index 0000000..057da4c --- /dev/null +++ b/src/endian_uqm.h @@ -0,0 +1,136 @@ +/* + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +/* + * Endian swapping, taken from SDL-1.2.5 sources and modified + * Original copyright (C) Sam Lantinga + */ + +#ifndef ENDIAN_UQM_H_ +#define ENDIAN_UQM_H_ + +#include "config.h" +#include "types.h" + +#if defined (__APPLE__) && defined (__GNUC__) +// When using the MacOS gcc compiler to build universal binaries, +// each file will be compiled once for each platform. +// This means that checking endianness beforehand from build.sh will not do, +// but fortunately, gcc defines __BIG_ENDIAN__ or __LITTLE_ENDIAN__ on +// this platform. +# if defined(__BIG_ENDIAN__) +# undef WORDS_BIGENDIAN +# define WORDS_BIGENDIAN +# elif defined(__LITTLE_ENDIAN__) +# undef WORDS_BIGENDIAN +# else + // Neither __BIG_ENDIAN__ nor __LITTLE_ENDIAN__ is defined. + // Fallback to using the build.sh defined value. +# endif +#endif /* __APPLE__ */ + +#if defined(_MSC_VER) || defined(__BORLANDC__) || \ + defined(__DMC__) || defined(__SC__) || \ + defined(__WATCOMC__) || defined(__LCC__) +#ifndef __inline__ +#define __inline__ __inline +#endif +#endif + +/* The macros used to swap values */ +/* Try to use superfast macros on systems that support them */ +#ifdef linux +#include <endian.h> +#ifdef __arch__swab16 +#define UQM_Swap16 __arch__swab16 +#endif +#ifdef __arch__swab32 +#define UQM_Swap32 __arch__swab32 +#endif +#endif /* linux */ + +#if defined(__cplusplus) +extern "C" { +#endif + +/* Use inline functions for compilers that support them, and static + functions for those that do not. Because these functions become + static for compilers that do not support inline functions, this + header should only be included in files that actually use them. +*/ +#ifndef UQM_Swap16 +static __inline__ uint16 UQM_Swap16(uint16 D) +{ + return((D<<8)|(D>>8)); +} +#endif +#ifndef UQM_Swap32 +static __inline__ uint32 UQM_Swap32(uint32 D) +{ + return((D<<24)|((D<<8)&0x00FF0000)|((D>>8)&0x0000FF00)|(D>>24)); +} +#endif +#ifdef UQM_INT64 +#ifndef UQM_Swap64 +static __inline__ uint64 UQM_Swap64(uint64 val) +{ + uint32 hi, lo; + + /* Separate into high and low 32-bit values and swap them */ + lo = (uint32)(val&0xFFFFFFFF); + val >>= 32; + hi = (uint32)(val&0xFFFFFFFF); + val = UQM_Swap32(lo); + val <<= 32; + val |= UQM_Swap32(hi); + return(val); +} +#endif +#else +#ifndef UQM_Swap64 +/* This is mainly to keep compilers from complaining in SDL code. + If there is no real 64-bit datatype, then compilers will complain about + the fake 64-bit datatype that SDL provides when it compiles user code. +*/ +#define UQM_Swap64(X) (X) +#endif +#endif /* UQM_INT64 */ + + +/* Byteswap item from the specified endianness to the native endianness + * or vice versa. + */ +#ifndef WORDS_BIGENDIAN +#define UQM_SwapLE16(X) (X) +#define UQM_SwapLE32(X) (X) +#define UQM_SwapLE64(X) (X) +#define UQM_SwapBE16(X) UQM_Swap16(X) +#define UQM_SwapBE32(X) UQM_Swap32(X) +#define UQM_SwapBE64(X) UQM_Swap64(X) +#else +#define UQM_SwapLE16(X) UQM_Swap16(X) +#define UQM_SwapLE32(X) UQM_Swap32(X) +#define UQM_SwapLE64(X) UQM_Swap64(X) +#define UQM_SwapBE16(X) (X) +#define UQM_SwapBE32(X) (X) +#define UQM_SwapBE64(X) (X) +#endif + +#if defined(__cplusplus) +} +#endif + +#endif /* _ENDIAN_H */ |