mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 18:09:48 +00:00
778 lines
18 KiB
C++
778 lines
18 KiB
C++
#ifndef CRYPTOPP_MISC_H
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#define CRYPTOPP_MISC_H
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#include "cryptlib.h"
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#include "smartptr.h"
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#ifdef INTEL_INTRINSICS
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#include <stdlib.h>
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#endif
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NAMESPACE_BEGIN(CryptoPP)
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// ************** compile-time assertion ***************
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template <bool b>
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struct CompileAssert
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{
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static char dummy[2*b-1];
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};
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#define CRYPTOPP_COMPILE_ASSERT(assertion) CRYPTOPP_COMPILE_ASSERT_INSTANCE(assertion, __LINE__)
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#if defined(CRYPTOPP_EXPORTS) || defined(CRYPTOPP_IMPORTS)
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#define CRYPTOPP_COMPILE_ASSERT_INSTANCE(assertion, instance)
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#else
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#define CRYPTOPP_COMPILE_ASSERT_INSTANCE(assertion, instance) static CompileAssert<(assertion)> CRYPTOPP_ASSERT_JOIN(cryptopp_assert_, instance)
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#endif
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#define CRYPTOPP_ASSERT_JOIN(X, Y) CRYPTOPP_DO_ASSERT_JOIN(X, Y)
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#define CRYPTOPP_DO_ASSERT_JOIN(X, Y) X##Y
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// ************** misc classes ***************
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class CRYPTOPP_DLL Empty
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{
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};
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template <class BASE1, class BASE2>
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class CRYPTOPP_NO_VTABLE TwoBases : public BASE1, public BASE2
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{
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};
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template <class BASE1, class BASE2, class BASE3>
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class CRYPTOPP_NO_VTABLE ThreeBases : public BASE1, public BASE2, public BASE3
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{
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};
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template <class T>
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class ObjectHolder
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{
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protected:
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T m_object;
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};
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class NotCopyable
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{
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public:
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NotCopyable() {}
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private:
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NotCopyable(const NotCopyable &);
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void operator=(const NotCopyable &);
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};
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// ************** misc functions ***************
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// can't use std::min or std::max in MSVC60 or Cygwin 1.1.0
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template <class _Tp> inline const _Tp& STDMIN(const _Tp& __a, const _Tp& __b)
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{
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return __b < __a ? __b : __a;
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}
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template <class _Tp> inline const _Tp& STDMAX(const _Tp& __a, const _Tp& __b)
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{
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return __a < __b ? __b : __a;
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}
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#define RETURN_IF_NONZERO(x) unsigned int returnedValue = x; if (returnedValue) return returnedValue
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// this version of the macro is fastest on Pentium 3 and Pentium 4 with MSVC 6 SP5 w/ Processor Pack
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#define GETBYTE(x, y) (unsigned int)byte((x)>>(8*(y)))
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// these may be faster on other CPUs/compilers
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// #define GETBYTE(x, y) (unsigned int)(((x)>>(8*(y)))&255)
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// #define GETBYTE(x, y) (((byte *)&(x))[y])
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CRYPTOPP_DLL unsigned int Parity(unsigned long);
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CRYPTOPP_DLL unsigned int BytePrecision(unsigned long);
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CRYPTOPP_DLL unsigned int BitPrecision(unsigned long);
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CRYPTOPP_DLL unsigned long Crop(unsigned long, unsigned int size);
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inline unsigned int BitsToBytes(unsigned int bitCount)
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{
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return ((bitCount+7)/(8));
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}
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inline unsigned int BytesToWords(unsigned int byteCount)
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{
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return ((byteCount+WORD_SIZE-1)/WORD_SIZE);
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}
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inline unsigned int BitsToWords(unsigned int bitCount)
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{
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return ((bitCount+WORD_BITS-1)/(WORD_BITS));
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}
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CRYPTOPP_DLL void xorbuf(byte *buf, const byte *mask, unsigned int count);
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CRYPTOPP_DLL void xorbuf(byte *output, const byte *input, const byte *mask, unsigned int count);
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template <class T>
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inline bool IsPowerOf2(T n)
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{
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return n > 0 && (n & (n-1)) == 0;
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}
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template <class T1, class T2>
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inline T2 ModPowerOf2(T1 a, T2 b)
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{
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assert(IsPowerOf2(b));
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return T2(a) & (b-1);
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}
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template <class T>
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inline T RoundDownToMultipleOf(T n, T m)
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{
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return n - (IsPowerOf2(m) ? ModPowerOf2(n, m) : (n%m));
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}
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template <class T>
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inline T RoundUpToMultipleOf(T n, T m)
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{
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return RoundDownToMultipleOf(n+m-1, m);
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}
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template <class T>
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inline unsigned int GetAlignment(T *dummy=NULL) // VC60 workaround
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{
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#if (_MSC_VER >= 1300)
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return __alignof(T);
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#elif defined(__GNUC__)
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return __alignof__(T);
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#else
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return sizeof(T);
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#endif
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}
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inline bool IsAlignedOn(const void *p, unsigned int alignment)
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{
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return IsPowerOf2(alignment) ? ModPowerOf2((unsigned int)p, alignment) == 0 : (unsigned int)p % alignment == 0;
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}
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template <class T>
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inline bool IsAligned(const void *p, T *dummy=NULL) // VC60 workaround
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{
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return IsAlignedOn(p, GetAlignment<T>());
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}
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#ifdef IS_LITTLE_ENDIAN
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typedef LittleEndian NativeByteOrder;
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#else
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typedef BigEndian NativeByteOrder;
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#endif
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inline ByteOrder GetNativeByteOrder()
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{
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return NativeByteOrder::ToEnum();
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}
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inline bool NativeByteOrderIs(ByteOrder order)
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{
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return order == GetNativeByteOrder();
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}
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template <class T> // can't use <sstream> because GCC 2.95.2 doesn't have it
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std::string IntToString(T a, unsigned int base = 10)
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{
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if (a == 0)
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return "0";
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bool negate = false;
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if (a < 0)
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{
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negate = true;
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a = 0-a; // VC .NET does not like -a
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}
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std::string result;
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while (a > 0)
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{
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T digit = a % base;
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result = char((digit < 10 ? '0' : ('a' - 10)) + digit) + result;
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a /= base;
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}
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if (negate)
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result = "-" + result;
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return result;
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}
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template <class T1, class T2>
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inline T1 SaturatingSubtract(T1 a, T2 b)
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{
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CRYPTOPP_COMPILE_ASSERT_INSTANCE(T1(-1)>0, 0); // T1 is unsigned type
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CRYPTOPP_COMPILE_ASSERT_INSTANCE(T2(-1)>0, 1); // T2 is unsigned type
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return T1((a > b) ? (a - b) : 0);
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}
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template <class T>
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inline CipherDir GetCipherDir(const T &obj)
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{
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return obj.IsForwardTransformation() ? ENCRYPTION : DECRYPTION;
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}
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// This function safely initializes a static object in a multithreaded environment without using locks.
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// It may leak memory when two threads try to initialize the static object at the same time
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// but this should be acceptable since each static object is only initialized once per session.
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template <class T, class F>
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T & StaticObject(F NewT, T *dummy=NULL)
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{
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static member_ptr<T> s_pObject;
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static char s_objectState = 0;
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switch (s_objectState)
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{
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case 0:
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s_objectState = 1;
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s_pObject.reset(NewT());
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s_objectState = 2;
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break;
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case 1:
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while (s_objectState == 1) {}
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default:
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break;
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}
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return *s_pObject;
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};
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// ************** rotate functions ***************
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template <class T> inline T rotlFixed(T x, unsigned int y)
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{
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assert(y < sizeof(T)*8);
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return (x<<y) | (x>>(sizeof(T)*8-y));
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}
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template <class T> inline T rotrFixed(T x, unsigned int y)
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{
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assert(y < sizeof(T)*8);
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return (x>>y) | (x<<(sizeof(T)*8-y));
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}
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template <class T> inline T rotlVariable(T x, unsigned int y)
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{
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assert(y < sizeof(T)*8);
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return (x<<y) | (x>>(sizeof(T)*8-y));
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}
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template <class T> inline T rotrVariable(T x, unsigned int y)
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{
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assert(y < sizeof(T)*8);
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return (x>>y) | (x<<(sizeof(T)*8-y));
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}
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template <class T> inline T rotlMod(T x, unsigned int y)
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{
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y %= sizeof(T)*8;
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return (x<<y) | (x>>(sizeof(T)*8-y));
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}
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template <class T> inline T rotrMod(T x, unsigned int y)
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{
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y %= sizeof(T)*8;
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return (x>>y) | (x<<(sizeof(T)*8-y));
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}
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#ifdef INTEL_INTRINSICS
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#pragma intrinsic(_lrotl, _lrotr)
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template<> inline word32 rotlFixed<word32>(word32 x, unsigned int y)
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{
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assert(y < 32);
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return y ? _lrotl(x, y) : x;
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}
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template<> inline word32 rotrFixed<word32>(word32 x, unsigned int y)
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{
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assert(y < 32);
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return y ? _lrotr(x, y) : x;
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}
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template<> inline word32 rotlVariable<word32>(word32 x, unsigned int y)
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{
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assert(y < 32);
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return _lrotl(x, y);
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}
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template<> inline word32 rotrVariable<word32>(word32 x, unsigned int y)
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{
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assert(y < 32);
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return _lrotr(x, y);
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}
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template<> inline word32 rotlMod<word32>(word32 x, unsigned int y)
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{
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return _lrotl(x, y);
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}
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template<> inline word32 rotrMod<word32>(word32 x, unsigned int y)
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{
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return _lrotr(x, y);
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}
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#endif // #ifdef INTEL_INTRINSICS
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#ifdef PPC_INTRINSICS
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template<> inline word32 rotlFixed<word32>(word32 x, unsigned int y)
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{
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assert(y < 32);
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return y ? __rlwinm(x,y,0,31) : x;
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}
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template<> inline word32 rotrFixed<word32>(word32 x, unsigned int y)
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{
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assert(y < 32);
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return y ? __rlwinm(x,32-y,0,31) : x;
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}
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template<> inline word32 rotlVariable<word32>(word32 x, unsigned int y)
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{
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assert(y < 32);
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return (__rlwnm(x,y,0,31));
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}
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template<> inline word32 rotrVariable<word32>(word32 x, unsigned int y)
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{
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assert(y < 32);
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return (__rlwnm(x,32-y,0,31));
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}
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template<> inline word32 rotlMod<word32>(word32 x, unsigned int y)
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{
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return (__rlwnm(x,y,0,31));
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}
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template<> inline word32 rotrMod<word32>(word32 x, unsigned int y)
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{
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return (__rlwnm(x,32-y,0,31));
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}
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#endif // #ifdef PPC_INTRINSICS
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// ************** endian reversal ***************
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template <class T>
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inline unsigned int GetByte(ByteOrder order, T value, unsigned int index)
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{
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if (order == LITTLE_ENDIAN_ORDER)
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return GETBYTE(value, index);
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else
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return GETBYTE(value, sizeof(T)-index-1);
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}
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inline byte ByteReverse(byte value)
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{
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return value;
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}
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inline word16 ByteReverse(word16 value)
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{
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return rotlFixed(value, 8U);
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}
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inline word32 ByteReverse(word32 value)
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{
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#ifdef PPC_INTRINSICS
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// PPC: load reverse indexed instruction
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return (word32)__lwbrx(&value,0);
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#elif defined(FAST_ROTATE)
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// 5 instructions with rotate instruction, 9 without
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return (rotrFixed(value, 8U) & 0xff00ff00) | (rotlFixed(value, 8U) & 0x00ff00ff);
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#else
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// 6 instructions with rotate instruction, 8 without
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value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
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return rotlFixed(value, 16U);
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#endif
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}
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#ifdef WORD64_AVAILABLE
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inline word64 ByteReverse(word64 value)
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{
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#ifdef CRYPTOPP_SLOW_WORD64
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return (word64(ByteReverse(word32(value))) << 32) | ByteReverse(word32(value>>32));
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#else
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value = ((value & W64LIT(0xFF00FF00FF00FF00)) >> 8) | ((value & W64LIT(0x00FF00FF00FF00FF)) << 8);
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value = ((value & W64LIT(0xFFFF0000FFFF0000)) >> 16) | ((value & W64LIT(0x0000FFFF0000FFFF)) << 16);
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return rotlFixed(value, 32U);
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#endif
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}
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#endif
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inline byte BitReverse(byte value)
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{
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value = ((value & 0xAA) >> 1) | ((value & 0x55) << 1);
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value = ((value & 0xCC) >> 2) | ((value & 0x33) << 2);
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return rotlFixed(value, 4);
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}
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inline word16 BitReverse(word16 value)
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{
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value = ((value & 0xAAAA) >> 1) | ((value & 0x5555) << 1);
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value = ((value & 0xCCCC) >> 2) | ((value & 0x3333) << 2);
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value = ((value & 0xF0F0) >> 4) | ((value & 0x0F0F) << 4);
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return ByteReverse(value);
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}
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inline word32 BitReverse(word32 value)
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{
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value = ((value & 0xAAAAAAAA) >> 1) | ((value & 0x55555555) << 1);
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value = ((value & 0xCCCCCCCC) >> 2) | ((value & 0x33333333) << 2);
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value = ((value & 0xF0F0F0F0) >> 4) | ((value & 0x0F0F0F0F) << 4);
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return ByteReverse(value);
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}
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#ifdef WORD64_AVAILABLE
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inline word64 BitReverse(word64 value)
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{
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#ifdef CRYPTOPP_SLOW_WORD64
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return (word64(BitReverse(word32(value))) << 32) | BitReverse(word32(value>>32));
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#else
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value = ((value & W64LIT(0xAAAAAAAAAAAAAAAA)) >> 1) | ((value & W64LIT(0x5555555555555555)) << 1);
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value = ((value & W64LIT(0xCCCCCCCCCCCCCCCC)) >> 2) | ((value & W64LIT(0x3333333333333333)) << 2);
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value = ((value & W64LIT(0xF0F0F0F0F0F0F0F0)) >> 4) | ((value & W64LIT(0x0F0F0F0F0F0F0F0F)) << 4);
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return ByteReverse(value);
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#endif
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}
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#endif
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template <class T>
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inline T BitReverse(T value)
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{
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if (sizeof(T) == 1)
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return (T)BitReverse((byte)value);
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else if (sizeof(T) == 2)
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return (T)BitReverse((word16)value);
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else if (sizeof(T) == 4)
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return (T)BitReverse((word32)value);
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else
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{
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#ifdef WORD64_AVAILABLE
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assert(sizeof(T) == 8);
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return (T)BitReverse((word64)value);
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#else
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assert(false);
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return 0;
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#endif
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}
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}
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template <class T>
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inline T ConditionalByteReverse(ByteOrder order, T value)
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{
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return NativeByteOrderIs(order) ? value : ByteReverse(value);
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}
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template <class T>
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void ByteReverse(T *out, const T *in, unsigned int byteCount)
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{
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assert(byteCount % sizeof(T) == 0);
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unsigned int count = byteCount/sizeof(T);
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for (unsigned int i=0; i<count; i++)
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out[i] = ByteReverse(in[i]);
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}
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template <class T>
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inline void ConditionalByteReverse(ByteOrder order, T *out, const T *in, unsigned int byteCount)
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{
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if (!NativeByteOrderIs(order))
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ByteReverse(out, in, byteCount);
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else if (in != out)
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memcpy(out, in, byteCount);
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}
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template <class T>
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inline void GetUserKey(ByteOrder order, T *out, unsigned int outlen, const byte *in, unsigned int inlen)
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{
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const unsigned int U = sizeof(T);
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assert(inlen <= outlen*U);
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memcpy(out, in, inlen);
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memset((byte *)out+inlen, 0, outlen*U-inlen);
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ConditionalByteReverse(order, out, out, RoundUpToMultipleOf(inlen, U));
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}
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inline byte UnalignedGetWordNonTemplate(ByteOrder order, const byte *block, byte*)
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{
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return block[0];
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}
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inline word16 UnalignedGetWordNonTemplate(ByteOrder order, const byte *block, word16*)
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{
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return (order == BIG_ENDIAN_ORDER)
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? block[1] | (block[0] << 8)
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: block[0] | (block[1] << 8);
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}
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inline word32 UnalignedGetWordNonTemplate(ByteOrder order, const byte *block, word32*)
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{
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return (order == BIG_ENDIAN_ORDER)
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? word32(block[3]) | (word32(block[2]) << 8) | (word32(block[1]) << 16) | (word32(block[0]) << 24)
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: word32(block[0]) | (word32(block[1]) << 8) | (word32(block[2]) << 16) | (word32(block[3]) << 24);
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}
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#ifdef WORD64_AVAILABLE
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inline word64 UnalignedGetWordNonTemplate(ByteOrder order, const byte *block, word64*)
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{
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return (order == BIG_ENDIAN_ORDER)
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?
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(word64(block[7]) |
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(word64(block[6]) << 8) |
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(word64(block[5]) << 16) |
|
|
(word64(block[4]) << 24) |
|
|
(word64(block[3]) << 32) |
|
|
(word64(block[2]) << 40) |
|
|
(word64(block[1]) << 48) |
|
|
(word64(block[0]) << 56))
|
|
:
|
|
(word64(block[0]) |
|
|
(word64(block[1]) << 8) |
|
|
(word64(block[2]) << 16) |
|
|
(word64(block[3]) << 24) |
|
|
(word64(block[4]) << 32) |
|
|
(word64(block[5]) << 40) |
|
|
(word64(block[6]) << 48) |
|
|
(word64(block[7]) << 56));
|
|
}
|
|
#endif
|
|
|
|
template <class T>
|
|
inline T UnalignedGetWord(ByteOrder order, const byte *block, T*dummy=NULL)
|
|
{
|
|
return UnalignedGetWordNonTemplate(order, block, dummy);
|
|
}
|
|
|
|
inline void UnalignedPutWord(ByteOrder order, byte *block, byte value, const byte *xorBlock = NULL)
|
|
{
|
|
block[0] = xorBlock ? (value ^ xorBlock[0]) : value;
|
|
}
|
|
|
|
inline void UnalignedPutWord(ByteOrder order, byte *block, word16 value, const byte *xorBlock = NULL)
|
|
{
|
|
if (order == BIG_ENDIAN_ORDER)
|
|
{
|
|
block[0] = GETBYTE(value, 1);
|
|
block[1] = GETBYTE(value, 0);
|
|
}
|
|
else
|
|
{
|
|
block[0] = GETBYTE(value, 0);
|
|
block[1] = GETBYTE(value, 1);
|
|
}
|
|
|
|
if (xorBlock)
|
|
{
|
|
block[0] ^= xorBlock[0];
|
|
block[1] ^= xorBlock[1];
|
|
}
|
|
}
|
|
|
|
inline void UnalignedPutWord(ByteOrder order, byte *block, word32 value, const byte *xorBlock = NULL)
|
|
{
|
|
if (order == BIG_ENDIAN_ORDER)
|
|
{
|
|
block[0] = GETBYTE(value, 3);
|
|
block[1] = GETBYTE(value, 2);
|
|
block[2] = GETBYTE(value, 1);
|
|
block[3] = GETBYTE(value, 0);
|
|
}
|
|
else
|
|
{
|
|
block[0] = GETBYTE(value, 0);
|
|
block[1] = GETBYTE(value, 1);
|
|
block[2] = GETBYTE(value, 2);
|
|
block[3] = GETBYTE(value, 3);
|
|
}
|
|
|
|
if (xorBlock)
|
|
{
|
|
block[0] ^= xorBlock[0];
|
|
block[1] ^= xorBlock[1];
|
|
block[2] ^= xorBlock[2];
|
|
block[3] ^= xorBlock[3];
|
|
}
|
|
}
|
|
|
|
#ifdef WORD64_AVAILABLE
|
|
inline void UnalignedPutWord(ByteOrder order, byte *block, word64 value, const byte *xorBlock = NULL)
|
|
{
|
|
if (order == BIG_ENDIAN_ORDER)
|
|
{
|
|
block[0] = GETBYTE(value, 7);
|
|
block[1] = GETBYTE(value, 6);
|
|
block[2] = GETBYTE(value, 5);
|
|
block[3] = GETBYTE(value, 4);
|
|
block[4] = GETBYTE(value, 3);
|
|
block[5] = GETBYTE(value, 2);
|
|
block[6] = GETBYTE(value, 1);
|
|
block[7] = GETBYTE(value, 0);
|
|
}
|
|
else
|
|
{
|
|
block[0] = GETBYTE(value, 0);
|
|
block[1] = GETBYTE(value, 1);
|
|
block[2] = GETBYTE(value, 2);
|
|
block[3] = GETBYTE(value, 3);
|
|
block[4] = GETBYTE(value, 4);
|
|
block[5] = GETBYTE(value, 5);
|
|
block[6] = GETBYTE(value, 6);
|
|
block[7] = GETBYTE(value, 7);
|
|
}
|
|
|
|
if (xorBlock)
|
|
{
|
|
block[0] ^= xorBlock[0];
|
|
block[1] ^= xorBlock[1];
|
|
block[2] ^= xorBlock[2];
|
|
block[3] ^= xorBlock[3];
|
|
block[4] ^= xorBlock[4];
|
|
block[5] ^= xorBlock[5];
|
|
block[6] ^= xorBlock[6];
|
|
block[7] ^= xorBlock[7];
|
|
}
|
|
}
|
|
#endif
|
|
|
|
template <class T>
|
|
inline T GetWord(bool assumeAligned, ByteOrder order, const byte *block)
|
|
{
|
|
if (assumeAligned)
|
|
{
|
|
assert(IsAligned<T>(block));
|
|
return ConditionalByteReverse(order, *reinterpret_cast<const T *>(block));
|
|
}
|
|
else
|
|
return UnalignedGetWord<T>(order, block);
|
|
}
|
|
|
|
template <class T>
|
|
inline void GetWord(bool assumeAligned, ByteOrder order, T &result, const byte *block)
|
|
{
|
|
result = GetWord<T>(assumeAligned, order, block);
|
|
}
|
|
|
|
template <class T>
|
|
inline void PutWord(bool assumeAligned, ByteOrder order, byte *block, T value, const byte *xorBlock = NULL)
|
|
{
|
|
if (assumeAligned)
|
|
{
|
|
assert(IsAligned<T>(block));
|
|
if (xorBlock)
|
|
*reinterpret_cast<T *>(block) = ConditionalByteReverse(order, value) ^ *reinterpret_cast<const T *>(xorBlock);
|
|
else
|
|
*reinterpret_cast<T *>(block) = ConditionalByteReverse(order, value);
|
|
}
|
|
else
|
|
UnalignedPutWord(order, block, value, xorBlock);
|
|
}
|
|
|
|
template <class T, class B, bool A=true>
|
|
class GetBlock
|
|
{
|
|
public:
|
|
GetBlock(const void *block)
|
|
: m_block((const byte *)block) {}
|
|
|
|
template <class U>
|
|
inline GetBlock<T, B, A> & operator()(U &x)
|
|
{
|
|
CRYPTOPP_COMPILE_ASSERT(sizeof(U) >= sizeof(T));
|
|
x = GetWord<T>(A, B::ToEnum(), m_block);
|
|
m_block += sizeof(T);
|
|
return *this;
|
|
}
|
|
|
|
private:
|
|
const byte *m_block;
|
|
};
|
|
|
|
template <class T, class B, bool A=true>
|
|
class PutBlock
|
|
{
|
|
public:
|
|
PutBlock(const void *xorBlock, void *block)
|
|
: m_xorBlock((const byte *)xorBlock), m_block((byte *)block) {}
|
|
|
|
template <class U>
|
|
inline PutBlock<T, B, A> & operator()(U x)
|
|
{
|
|
PutWord(A, B::ToEnum(), m_block, (T)x, m_xorBlock);
|
|
m_block += sizeof(T);
|
|
if (m_xorBlock)
|
|
m_xorBlock += sizeof(T);
|
|
return *this;
|
|
}
|
|
|
|
private:
|
|
const byte *m_xorBlock;
|
|
byte *m_block;
|
|
};
|
|
|
|
template <class T, class B, bool A=true>
|
|
struct BlockGetAndPut
|
|
{
|
|
// function needed because of C++ grammatical ambiguity between expression-statements and declarations
|
|
static inline GetBlock<T, B, A> Get(const void *block) {return GetBlock<T, B, A>(block);}
|
|
typedef PutBlock<T, B, A> Put;
|
|
};
|
|
|
|
template <class T>
|
|
std::string WordToString(T value, ByteOrder order = BIG_ENDIAN_ORDER)
|
|
{
|
|
if (!NativeByteOrderIs(order))
|
|
value = ByteReverse(value);
|
|
|
|
return std::string((char *)&value, sizeof(value));
|
|
}
|
|
|
|
template <class T>
|
|
T StringToWord(const std::string &str, ByteOrder order = BIG_ENDIAN_ORDER)
|
|
{
|
|
T value = 0;
|
|
memcpy(&value, str.data(), STDMIN(sizeof(value), str.size()));
|
|
return NativeByteOrderIs(order) ? value : ByteReverse(value);
|
|
}
|
|
|
|
// ************** help remove warning on g++ ***************
|
|
|
|
template <bool overflow> struct SafeShifter;
|
|
|
|
template<> struct SafeShifter<true>
|
|
{
|
|
template <class T>
|
|
static inline T RightShift(T value, unsigned int bits)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
template <class T>
|
|
static inline T LeftShift(T value, unsigned int bits)
|
|
{
|
|
return 0;
|
|
}
|
|
};
|
|
|
|
template<> struct SafeShifter<false>
|
|
{
|
|
template <class T>
|
|
static inline T RightShift(T value, unsigned int bits)
|
|
{
|
|
return value >> bits;
|
|
}
|
|
|
|
template <class T>
|
|
static inline T LeftShift(T value, unsigned int bits)
|
|
{
|
|
return value << bits;
|
|
}
|
|
};
|
|
|
|
template <unsigned int bits, class T>
|
|
inline T SafeRightShift(T value)
|
|
{
|
|
return SafeShifter<(bits>=(8*sizeof(T)))>::RightShift(value, bits);
|
|
}
|
|
|
|
template <unsigned int bits, class T>
|
|
inline T SafeLeftShift(T value)
|
|
{
|
|
return SafeShifter<(bits>=(8*sizeof(T)))>::LeftShift(value, bits);
|
|
}
|
|
|
|
NAMESPACE_END
|
|
|
|
#endif // MISC_H
|