utils.h

Go to the documentation of this file.

/*
 * /phoenix/include/utils.h
 *
 * This file is a part of Phoenix operating system.
 * Copyright (c) 2011-2012, Artyom Lebedev <artyom.lebedev@gmail.com>
 * All rights reserved.
 * See COPYING file for copyright details.
 */

#ifndef COMMON_UTILS_H_
#define COMMON_UTILS_H_

namespace {

template <typename T>
inline T
Min(T x, T y) { return MIN(x, y); }

template <typename T>
inline T
Max(T x, T y) { return MAX(x, y); }

template <typename T, typename Tal>
inline T
RoundUp(T size, Tal align) { return ROUND_UP(size, align); }

template <typename T, typename Tal>
inline T
RoundDown(T size, Tal align) { return ROUND_DOWN(size, align); }

template <typename T>
inline bool
IsPowerOf2(T value) { return IS_POWER_OF_2(value); }

template <typename T, typename Tal>
inline T
RoundUp2(T size, Tal align)
{
    ASSERT(IsPowerOf2(align));
    return ROUND_UP2(size, align);
}

template <typename T, typename Tal>
inline T
RoundDown2(T size, Tal align)
{
    ASSERT(IsPowerOf2(align));
    return ROUND_DOWN2(size, align);
}

template <typename T>
inline T
RotL(const T value, const size_t numBits)
{
    return (value << numBits) | (value >> (sizeof(value) * NBBY - numBits));
}

template <typename T>
inline T
RotR(const T value, const size_t numBits)
{
    return (value >> numBits) | (value << (sizeof(value) * NBBY - numBits));
}

template <typename T>
struct UnalignedData {
    T value;
} __PACKED;

template <typename T>
inline T
GetUnaligned(const void *p)
{
    return static_cast<const UnalignedData<T> *>(p)->value;
}

template <typename T>
inline void
PutUnaligned(T value, void *p)
{
    static_cast<const UnalignedData<T> *>(p)->value = value;
}

} /* Anonymous namespace */

#endif /* COMMON_UTILS_H_ */