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147 lines
3.6 KiB
C
147 lines
3.6 KiB
C
/* this header file comes from libowfat, http://www.fefe.de/libowfat/ */
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#ifndef UINT16_H
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#define UINT16_H
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#include <inttypes.h> // uint16_t, int16_t
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#include <stddef.h> // size_t
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef uint16_t uint16;
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typedef int16_t int16;
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#if (defined(__i386__) || defined(__x86_64__)) && !defined(NO_UINT16_MACROS)
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/* On x86 and x64 unaligned access are OK and the compiler knows it and
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* will collapse this long-looking code into a single load or store
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* instruction, so turn it into inline functions */
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static inline void uint16_pack(char* out,uint16 in) {
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out[0]=in;
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out[1]=in>>8;
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}
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static inline void uint16_unpack(const char *in,uint16* out) {
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const unsigned char* i = (const unsigned char*)in;
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*out=i[0] | (i[1]<<8);
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}
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static inline uint16 uint16_read(const char* in) {
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const unsigned char* i = (const unsigned char*)in;
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return i[0] | (i[1]<<8);
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}
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static inline void uint16_pack_big(char* out,uint16 in) {
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out[0]=in>>8;
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out[1]=in;
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}
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static inline void uint16_unpack_big(const char *in,uint16* out) {
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const unsigned char* i = (const unsigned char*)in;
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*out=(i[0]<<8) | i[1];
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}
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static inline uint16 uint16_read_big(const char* in) {
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const unsigned char* i = (const unsigned char*)in;
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return (i[0]<<8) | i[1];
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}
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#else
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void uint16_pack(char *out,uint16 in);
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void uint16_pack_big(char *out,uint16 in);
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void uint16_unpack(const char *in,uint16* out);
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void uint16_unpack_big(const char *in,uint16* out);
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uint16 uint16_read(const char *in);
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uint16 uint16_read_big(const char *in);
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#endif
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static inline size_t fmt_uint16(char* out, uint16 in) {
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if (out) uint16_pack(out,in);
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return 2;
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}
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static inline size_t fmt_uint16_big(char* out, uint16 in) {
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if (out) uint16_pack_big(out,in);
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return 2;
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}
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static inline size_t scan_uint16(const char* in, size_t len, uint16_t* b) {
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if (len<2) return 0;
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*b = uint16_read(in);
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return 2;
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}
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static inline size_t scan_uint16_big(const char* in, size_t len, uint16_t* b) {
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if (len<2) return 0;
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*b = uint16_read_big(in);
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return 2;
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}
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#ifdef __cplusplus
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}
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inline void uint16_pack(unsigned char* out,uint16 in) {
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uint16_pack(reinterpret_cast<char*>(out), in);
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}
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inline void uint16_pack_big(unsigned char* out,uint16 in) {
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uint16_pack_big(reinterpret_cast<char*>(out), in);
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}
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inline void uint16_unpack(const unsigned char *in,uint16* out) {
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uint16_unpack(reinterpret_cast<const char*>(in), out);
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}
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inline void uint16_unpack_big(const unsigned char *in,uint16* out) {
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uint16_unpack_big(reinterpret_cast<const char*>(in), out);
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}
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inline void uint16_pack(uint16* out,uint16 in) {
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uint16_pack(reinterpret_cast<char*>(out), in);
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}
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inline void uint16_pack_big(uint16* out,uint16 in) {
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uint16_pack_big(reinterpret_cast<char*>(out), in);
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}
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inline void uint16_unpack(uint16* *in,uint16* out) {
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uint16_unpack(reinterpret_cast<const char*>(in), out);
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}
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inline void uint16_unpack_big(uint16* *in,uint16* out) {
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uint16_unpack_big(reinterpret_cast<const char*>(in), out);
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}
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inline uint16 uint16_read(const unsigned char *in) {
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return uint16_read(reinterpret_cast<const char*>(in));
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}
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inline uint16 uint16_read_big(const unsigned char *in) {
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return uint16_read_big(reinterpret_cast<const char*>(in));
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}
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inline uint16 uint16_read(const uint16 *in) {
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return uint16_read(reinterpret_cast<const char*>(in));
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}
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inline uint16 uint16_read_big(const uint16 *in) {
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return uint16_read_big(reinterpret_cast<const char*>(in));
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}
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inline uint16 uint_read(const uint16* in) {
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return uint16_read(reinterpret_cast<const char*>(in));
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}
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inline uint16 uint_read_big(const uint16* in) {
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return uint16_read_big(reinterpret_cast<const char*>(in));
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}
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#endif
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#endif
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