112 lines
2.9 KiB
Objective-C
112 lines
2.9 KiB
Objective-C
#ifndef ENDIEN_H
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#define ENDIEN_H
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#include <stdint.h>
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/**
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@file
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@brief Pořadí bytů ve slově.
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*/
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#if __GNUC__ < 4 // Compiler test
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#error "Zkontroluj nastaveni"
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#endif
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// Pro 16.bit musíme struktury pakovat
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#define PACKSTRUCT __attribute__((packed))
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#if __thumb__
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// Specificky a krátce pro danou architektutu a pokud chceme mít úplnou kontrolu.
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static inline uint32_t swab32 (uint32_t p) {
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register uint32_t t;
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asm volatile ("rev %0, %1":"=r"(t):"0"(p));
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return t;
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}
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#else //__thumb__
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// Obecně
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static inline uint32_t swab32 (uint32_t p) {
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// return __builtin_bswap32 (p); // I takto to jde, ale pro názornost:
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return ((p & 0x000000ff) << 24)
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| ((p & 0x0000ff00) << 8)
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| ((p & 0x00ff0000) >> 8)
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| ((p & 0xff000000) >> 24);
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}
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#endif //__thumb__
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// Tohle nebudeme ani specifikovat pro ARM
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static inline uint16_t swab16 (uint16_t p) {
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return (p << 8) | (p >> 8);
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}
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// Nedělá nic a ani nijak neotravuje - pouze pro kompatibilitu
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static inline uint32_t nosw32 (uint32_t p) {
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return p;
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}
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static inline uint16_t nosw16 (uint16_t p) {
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return p;
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}
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// Specificky podle pořadí bytů - LE je pro ARM i X86 normální.
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#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
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#define cpu_to_be32 swab32
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#define be32_to_cpu swab32
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#define cpu_to_le32 nosw32
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#define le32_to_cpu nosw32
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#define cpu_to_be16 swab16
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#define be16_to_cpu swab16
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#define cpu_to_le16 nosw16
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#define le16_to_cpu nosw16
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#else
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#define cpu_to_be32 nosw32
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#define be32_to_cpu nosw32
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#define cpu_to_le32 swab32
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#define le32_to_cpu swab32
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#define cpu_to_be16 nosw16
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#define be16_to_cpu nosw16
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#define cpu_to_le16 swab16
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#define le16_to_cpu swab16
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#endif
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/**
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@class ui32be
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@brief C++ 32.bit data v BIG Endien.
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@class ui32le
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@brief C++ 32.bit data v LITTLE Endien.
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@class ui16be
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@brief C++ 16.bit data v BIG Endien.
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@class ui16le
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@brief C++ 16.bit data v LITTLE Endien.
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*/
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class ui32be {
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public:
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/// Nastavení hodnoty
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/// @par p uint32_t hodnota
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void set (uint32_t p) {num = cpu_to_be32 (p); };
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/// Zjištění hodnoty
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/// @return uint32_t hodnota
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uint32_t get (void) {return be32_to_cpu (num); };
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private:
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/// Vlastní data uint32_t - k nim se přímo nedostaneme, jsou privátní
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uint32_t num;
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}PACKSTRUCT;
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class ui32le {
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public:
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void set (uint32_t p) {num = cpu_to_le32 (p); };
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uint32_t get (void) {return le32_to_cpu (num); };
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private:
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uint32_t num;
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}PACKSTRUCT;
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/* *******************************************************/
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class ui16be {
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public:
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void set (uint16_t p) {num = cpu_to_be16 (p); };
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uint16_t get (void) {return be16_to_cpu (num); };
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private:
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uint16_t num;
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}PACKSTRUCT;
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class ui16le {
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public:
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void set (uint16_t p) {num = cpu_to_le16 (p); };
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uint16_t get (void) {return le16_to_cpu (num); };
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private:
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uint16_t num;
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}PACKSTRUCT;
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#endif // ENDIEN_H
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