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// **************************************************************************
// * This file is part of the FreeFileSync project. It is distributed under *
// * GNU General Public License: http://www.gnu.org/licenses/gpl.html *
// * Copyright (C) Zenju (zenju AT gmx DOT de) - All Rights Reserved *
// **************************************************************************
#ifndef FFS_LARGE_64_BIT_INTEGER_H_INCLUDED
#define FFS_LARGE_64_BIT_INTEGER_H_INCLUDED
#include <cassert>
#include <limits>
#include <cstdint>
#include <cstdint>
#include <ostream>
#include "assert_static.h"
#include "type_tools.h"
#ifdef ZEN_WIN
#include "win.h"
#endif
/*
zen::Int64/zen::UInt64: wrapper classes around std::int64_t/std::uint64_t
- default initialization with 0
- debug runtime overflow/underflow checks
- safe and explicit semantics: no unsafe type conversions
- safe conversion to and from Windows 64-bit integers
- specializes std::numeric_limits
- support stream operator<< and operator>>
*/
namespace zen
{
template <class T, class U> inline
void checkRange(U value)
{
//caveat: std::numeric_limits<T>::min returns minimum positive(!) number for T = double, while behaving correctly for integer types... sigh
assert(double(std::numeric_limits<T>::lowest()) <= double(value) && //new with C++11!
double(std::numeric_limits<T>::max() ) >= double(value));
}
class Int64
{
public:
//safe implicit conversions
Int64() : value(0) {}
Int64(const Int64& rhs) : value(rhs.value) {}
template <class T>
Int64(T rhs, typename EnableIf<IsSignedInt<T>::value&& sizeof(T) <= sizeof(std::int64_t)>::Type* = nullptr) :
value(static_cast<std::int64_t>(rhs)) {}
//unsafe explicit but checked conversion for all other integer types
template <class T> explicit Int64(T rhs, typename EnableIf<!(IsSignedInt<T>::value&& sizeof(T) <= sizeof(std::int64_t))>::Type* = nullptr) :
value(static_cast<std::int64_t>(rhs)) { checkRange<std::int64_t>(rhs); }
Int64& operator=(const Int64& rhs) { value = rhs.value; return *this; }
#ifdef ZEN_WIN
Int64(DWORD low, LONG high)
{
assert_static(sizeof(low) + sizeof(high) == sizeof(value));
LARGE_INTEGER cvt = {};
cvt.LowPart = low;
cvt.HighPart = high;
value = cvt.QuadPart;
}
LONG getHi() const
{
LARGE_INTEGER cvt = {};
cvt.QuadPart = value;
return cvt.HighPart;
}
DWORD getLo() const
{
LARGE_INTEGER cvt = {};
cvt.QuadPart = value;
return cvt.LowPart;
}
#endif
Int64& operator+=(const Int64& rhs) { checkRange<std::int64_t>(double(value) + rhs.value); value += rhs.value; return *this; }
Int64& operator-=(const Int64& rhs) { checkRange<std::int64_t>(double(value) - rhs.value); value -= rhs.value; return *this; }
Int64& operator*=(const Int64& rhs) { checkRange<std::int64_t>(double(value) * rhs.value); value *= rhs.value; return *this; }
Int64& operator/=(const Int64& rhs) { assert(rhs.value != 0); value /= rhs.value; return *this; }
Int64& operator%=(const Int64& rhs) { assert(rhs.value != 0); value %= rhs.value; return *this; }
Int64& operator&=(const Int64& rhs) { value &= rhs.value; return *this;}
Int64& operator|=(const Int64& rhs) { value |= rhs.value; return *this;}
Int64& operator<<=(int rhs) { assert(rhs < 0 || (value << rhs) >> rhs == value); value <<= rhs; return *this; }
Int64& operator>>=(int rhs) { assert(rhs > 0 || (value >> rhs) << rhs == value); value >>= rhs; return *this; }
Int64 operator-() const { return -value; }
inline friend bool operator==(const Int64& lhs, const Int64& rhs) { return lhs.value == rhs.value; }
inline friend bool operator!=(const Int64& lhs, const Int64& rhs) { return lhs.value != rhs.value; }
inline friend bool operator< (const Int64& lhs, const Int64& rhs) { return lhs.value < rhs.value; }
inline friend bool operator> (const Int64& lhs, const Int64& rhs) { return lhs.value > rhs.value; }
inline friend bool operator<=(const Int64& lhs, const Int64& rhs) { return lhs.value <= rhs.value; }
inline friend bool operator>=(const Int64& lhs, const Int64& rhs) { return lhs.value >= rhs.value; }
//checked conversion to arbitrary target integer type
template <class T> inline friend T to(Int64 number) { checkRange<T>(number.value); return static_cast<T>(number.value); }
template <class T> inline friend std::basic_istream<T>& operator>>(std::basic_istream<T>& lhs, Int64& rhs) { lhs >> rhs.value; return lhs; }
template <class T> inline friend std::basic_ostream<T>& operator<<(std::basic_ostream<T>& lhs, const Int64& rhs) { lhs << rhs.value; return lhs; }
private:
std::int64_t value;
};
inline Int64 operator+ (const Int64& lhs, const Int64& rhs) { return Int64(lhs) += rhs; }
inline Int64 operator- (const Int64& lhs, const Int64& rhs) { return Int64(lhs) -= rhs; }
inline Int64 operator* (const Int64& lhs, const Int64& rhs) { return Int64(lhs) *= rhs; }
inline Int64 operator/ (const Int64& lhs, const Int64& rhs) { return Int64(lhs) /= rhs; }
inline Int64 operator% (const Int64& lhs, const Int64& rhs) { return Int64(lhs) %= rhs; }
inline Int64 operator& (const Int64& lhs, const Int64& rhs) { return Int64(lhs) &= rhs; }
inline Int64 operator| (const Int64& lhs, const Int64& rhs) { return Int64(lhs) |= rhs; }
inline Int64 operator<<(const Int64& lhs, int rhs) { return Int64(lhs) <<= rhs; }
inline Int64 operator>>(const Int64& lhs, int rhs) { return Int64(lhs) >>= rhs; }
class UInt64
{
public:
//safe implicit conversions
UInt64() : value(0) {}
UInt64(const UInt64& rhs) : value(rhs.value) {}
template <class T>
UInt64(T rhs, typename EnableIf<IsUnsignedInt<T>::value&& sizeof(T) <= sizeof(std::uint64_t)>::Type* = nullptr) :
value(static_cast<std::uint64_t>(rhs)) {}
//unsafe explicit but checked conversion for all other integer types
template <class T> explicit UInt64(T rhs, typename EnableIf<!(IsUnsignedInt<T>::value&& sizeof(T) <= sizeof(std::uint64_t))>::Type* = nullptr) :
value(static_cast<std::uint64_t>(rhs)) { checkRange<std::uint64_t>(rhs); }
UInt64& operator=(const UInt64& rhs) { value = rhs.value; return *this; }
#ifdef ZEN_WIN
UInt64(DWORD low, DWORD high)
{
assert_static(sizeof(low) + sizeof(high) == sizeof(value));
ULARGE_INTEGER cvt = {};
cvt.LowPart = low;
cvt.HighPart = high;
value = cvt.QuadPart;
}
DWORD getHi() const
{
ULARGE_INTEGER cvt = {};
cvt.QuadPart = value;
return cvt.HighPart;
}
DWORD getLo() const
{
ULARGE_INTEGER cvt = {};
cvt.QuadPart = value;
return cvt.LowPart;
}
#endif
UInt64& operator+=(const UInt64& rhs) { checkRange<std::uint64_t>(double(value) + rhs.value); value += rhs.value; return *this; }
UInt64& operator-=(const UInt64& rhs) { checkRange<std::uint64_t>(double(value) - rhs.value); value -= rhs.value; return *this; }
UInt64& operator*=(const UInt64& rhs) { checkRange<std::uint64_t>(double(value) * rhs.value); value *= rhs.value; return *this; }
UInt64& operator/=(const UInt64& rhs) { assert(rhs.value != 0); value /= rhs.value; return *this; }
UInt64& operator%=(const UInt64& rhs) { assert(rhs.value != 0); value %= rhs.value; return *this; }
UInt64& operator&=(const UInt64& rhs) { value &= rhs.value; return *this;}
UInt64& operator|=(const UInt64& rhs) { value |= rhs.value; return *this;}
UInt64& operator<<=(int rhs) { assert(rhs < 0 || (value << rhs) >> rhs == value); value <<= rhs; return *this; }
UInt64& operator>>=(int rhs) { assert(rhs > 0 || (value >> rhs) << rhs == value); value >>= rhs; return *this; }
inline friend bool operator==(const UInt64& lhs, const UInt64& rhs) { return lhs.value == rhs.value; }
inline friend bool operator!=(const UInt64& lhs, const UInt64& rhs) { return lhs.value != rhs.value; }
inline friend bool operator< (const UInt64& lhs, const UInt64& rhs) { return lhs.value < rhs.value; }
inline friend bool operator> (const UInt64& lhs, const UInt64& rhs) { return lhs.value > rhs.value; }
inline friend bool operator<=(const UInt64& lhs, const UInt64& rhs) { return lhs.value <= rhs.value; }
inline friend bool operator>=(const UInt64& lhs, const UInt64& rhs) { return lhs.value >= rhs.value; }
//checked conversion to arbitrary target integer type
template <class T> friend T to(UInt64 number);
template <class T> inline friend std::basic_istream<T>& operator>>(std::basic_istream<T>& lhs, UInt64& rhs) { lhs >> rhs.value; return lhs; }
template <class T> inline friend std::basic_ostream<T>& operator<<(std::basic_ostream<T>& lhs, const UInt64& rhs) { lhs << rhs.value; return lhs; }
private:
std::uint64_t value;
};
template <class T> inline T to(UInt64 number) { checkRange<T>(number.value); return static_cast<T>(number.value); } //Clang 3.2 doesn't properly handle inline-friends defined in class definition
inline UInt64 operator+ (const UInt64& lhs, const UInt64& rhs) { return UInt64(lhs) += rhs; }
inline UInt64 operator- (const UInt64& lhs, const UInt64& rhs) { return UInt64(lhs) -= rhs; }
inline UInt64 operator* (const UInt64& lhs, const UInt64& rhs) { return UInt64(lhs) *= rhs; }
inline UInt64 operator/ (const UInt64& lhs, const UInt64& rhs) { return UInt64(lhs) /= rhs; }
inline UInt64 operator% (const UInt64& lhs, const UInt64& rhs) { return UInt64(lhs) %= rhs; }
inline UInt64 operator& (const UInt64& lhs, const UInt64& rhs) { return UInt64(lhs) &= rhs; }
inline UInt64 operator| (const UInt64& lhs, const UInt64& rhs) { return UInt64(lhs) |= rhs; }
inline UInt64 operator<<(const UInt64& lhs, int rhs) { return UInt64(lhs) <<= rhs; }
inline UInt64 operator>>(const UInt64& lhs, int rhs) { return UInt64(lhs) >>= rhs; }
template <> inline UInt64 to(Int64 number) { checkRange<std::uint64_t>(number.value); return UInt64(number.value); }
template <> inline Int64 to(UInt64 number) { checkRange<std:: int64_t>(number.value); return Int64(number.value); }
#ifdef ZEN_WIN
//convert FILETIME (number of 100-nanosecond intervals since January 1, 1601 UTC)
// to time_t (number of seconds since Jan. 1st 1970 UTC)
//
//FAT32 time is preserved exactly: FAT32 -> toTimeT -> tofiletime -> FAT32
inline
Int64 toTimeT(const FILETIME& ft)
{
return to<Int64>(UInt64(ft.dwLowDateTime, ft.dwHighDateTime) / 10000000U) - Int64(3054539008UL, 2);
//timeshift between ansi C time and FILETIME in seconds == 11644473600s
}
inline
FILETIME toFileTime(const Int64& utcTime)
{
const UInt64 fileTimeLong = to<UInt64>(utcTime + Int64(3054539008UL, 2)) * 10000000U;
const FILETIME output = { fileTimeLong.getLo(), fileTimeLong.getHi() };
return output;
}
#endif
}
//specialize numeric limits
namespace std
{
assert_static(std::numeric_limits<std:: int64_t>::is_specialized);
assert_static(std::numeric_limits<std::uint64_t>::is_specialized);
template <> class numeric_limits<zen::Int64> : public numeric_limits<std::int64_t>
{
public:
static zen::Int64 min() throw() { return numeric_limits<std::int64_t>::min(); }
static zen::Int64 max() throw() { return numeric_limits<std::int64_t>::max(); }
};
template <> class numeric_limits<zen::UInt64> : public numeric_limits<std::uint64_t>
{
public:
static zen::UInt64 min() throw() { return numeric_limits<std::uint64_t>::min(); }
static zen::UInt64 max() throw() { return numeric_limits<std::uint64_t>::max(); }
};
}
/*
//specialize zen type trait
namespace zen -> we cannot mix signed/unsigned in general arithmetic operations -> we'll use the ostream-approach
{
template <> struct IsUnsignedInt<UInt64> : StaticBool<true> {};
template <> struct IsSignedInt <Int64> : StaticBool<true> {};
}
*/
#endif //FFS_LARGE_64_BIT_INTEGER_H_INCLUDED
|
