39 lines
1.2 KiB
C
39 lines
1.2 KiB
C
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/* Warning : this header has no multi-inclusion guard. It must be included only once in the
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* translation unit of use. The reason is that all functions defined here are meant to
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* be inlined for performance purpose
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*/
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#include "../global.h"
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#ifdef FOUG_HAVE_MSVC_BUILTIN_BSWAP_FUNC
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# include <stdlib.h>
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#endif
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/*! Returns \p val with the order of bytes reversed, uses compiler builtin functions if available */
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FOUG_INLINE static uint16_t foug_uint16_bswap(uint16_t val)
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{
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#ifdef FOUG_HAVE_GCC_BUILTIN_BSWAP_FUNC
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return __builtin_bswap16(val);
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#elif defined(FOUG_HAVE_MSVC_BUILTIN_BSWAP_FUNC)
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return _byteswap_ushort(val);
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#else
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return ((val & 0x00FF) << 8) | ((val >> 8) & 0x00FF);
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#endif
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}
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/*! Returns \p val with the order of bytes reversed, uses compiler builtin functions if available */
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FOUG_INLINE static uint32_t foug_uint32_bswap(uint32_t val)
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{
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#ifdef FOUG_HAVE_GCC_BUILTIN_BSWAP_FUNC
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return __builtin_bswap32(val);
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#elif defined(FOUG_HAVE_MSVC_BUILTIN_BSWAP_FUNC)
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return _byteswap_ulong(val);
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#else
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return
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((val & 0x000000FF) << 24)
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| ((val & 0x0000FF00) << 8)
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| ((val >> 8) & 0x0000FF00)
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| ((val >> 24) & 0x000000FF);
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#endif
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}
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