math.h

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#ifndef STDEXT_MATH_H
#define STDEXT_MATH_H
 
#include <algorithm>
#include "types.h"
 
namespace stdext {
 
inline bool is_power_of_two(size_t v) { return ((v != 0) && !(v & (v - 1))); }
inline size_t to_power_of_two(size_t v) { if(v == 0) return 0; size_t r = 1; while(r < v && r != 0xffffffff) r <<= 1; return r; }
 
inline uint16_t readULE16(const uchar *addr) { return (uint16_t)addr[1] << 8 | addr[0]; }
inline uint32_t readULE32(const uchar *addr) { return (uint32_t)readULE16(addr + 2) << 16 | readULE16(addr); }
inline uint64_t readULE64(const uchar *addr) { return (uint64_t)readULE32(addr + 4) << 32 | readULE32(addr); }
 
inline void writeULE16(uchar *addr, uint16_t value) { addr[1] = value >> 8; addr[0] = (uint8_t)value; }
inline void writeULE32(uchar *addr, uint32_t value) { writeULE16(addr + 2, value >> 16); writeULE16(addr, (uint16_t)value); }
inline void writeULE64(uchar *addr, uint64_t value) { writeULE32(addr + 4, value >> 32); writeULE32(addr, (uint32_t)value); }
 
inline int16_t readSLE16(const uchar *addr) { return (int16_t)addr[1] << 8 | addr[0]; }
inline int32_t readSLE32(const uchar *addr) { return (int32_t)readSLE16(addr + 2) << 16 | readSLE16(addr); }
inline int64_t readSLE64(const uchar *addr) { return (int64_t)readSLE32(addr + 4) << 32 | readSLE32(addr); }
 
inline void writeSLE16(uchar *addr, int16_t value) { addr[1] = value >> 8; addr[0] = (int8_t)value; }
inline void writeSLE32(uchar *addr, int32_t value) { writeSLE16(addr + 2, value >> 16); writeSLE16(addr, (int16_t)value); }
inline void writeSLE64(uchar *addr, int64_t value) { writeSLE32(addr + 4, value >> 32); writeSLE32(addr, (int32_t)value); }
 
uint32_t adler32(const uint8_t *buffer, size_t size);
 
long random_range(long min, long max);
float random_range(float min, float max);
 
double round(double r);
 
template<typename T>
T clamp(T x, T min, T max) { return std::max<T>(min, std::min<T>(x, max)); }
 
}
 
#endif