// Copyright 2013 Dolphin Emulator Project
// Licensed under GPLv2
// Refer to the license.txt file included.

#ifndef _COMMONFUNCS_H_
#define _COMMONFUNCS_H_

#ifdef _WIN32
#define SLEEP(x) Sleep(x)
#else
#include <unistd.h>
#define SLEEP(x) usleep(x*1000)
#endif

template <bool> struct CompileTimeAssert;
template<> struct CompileTimeAssert<true> {};

#define b2(x)   (   (x) | (   (x) >> 1) )
#define b4(x)   ( b2(x) | ( b2(x) >> 2) )
#define b8(x)   ( b4(x) | ( b4(x) >> 4) )
#define b16(x)  ( b8(x) | ( b8(x) >> 8) )  
#define b32(x)  (b16(x) | (b16(x) >>16) )
#define ROUND_UP_POW2(x)    (b32(x - 1) + 1)

#define MIN(a, b)   ((a)<(b)?(a):(b))
#define MAX(a, b)   ((a)>(b)?(a):(b))

#define CLAMP(x, min, max)  (((x) > max) ? max : (((x) < min) ? min : (x)))

#define ARRAY_SIZE(a) (sizeof(a) / sizeof(a[0]))

#ifndef _WIN32

#include <errno.h>
#ifdef __linux__
#include <byteswap.h>
#elif defined __FreeBSD__
#include <sys/endian.h>
#endif

// go to debugger mode
    #ifdef GEKKO
        #define Crash()
    #elif defined _M_GENERIC
        #define Crash() { exit(1); }
    #else
        #define Crash() {asm ("int $3");}
    #endif
    #define ARRAYSIZE(A) (sizeof(A)/sizeof((A)[0]))
// GCC 4.8 defines all the rotate functions now
// Small issue with GCC's lrotl/lrotr intrinsics is they are still 32bit while we require 64bit
#ifndef _rotl
inline u32 _rotl(u32 x, int shift) {
    shift &= 31;
    if (!shift) return x;
    return (x << shift) | (x >> (32 - shift));
}

inline u32 _rotr(u32 x, int shift) {
    shift &= 31;
    if (!shift) return x;
    return (x >> shift) | (x << (32 - shift));
}
#endif

inline u64 _rotl64(u64 x, unsigned int shift){
    unsigned int n = shift % 64;
    return (x << n) | (x >> (64 - n));
}

inline u64 _rotr64(u64 x, unsigned int shift){
    unsigned int n = shift % 64;
    return (x >> n) | (x << (64 - n));
}

#else // WIN32
// Function Cross-Compatibility
    #define strcasecmp _stricmp
    #define strncasecmp _strnicmp
    #define unlink _unlink
    #define snprintf _snprintf
    #define vscprintf _vscprintf
    
// Locale Cross-Compatibility
    #define locale_t _locale_t
    #define freelocale _free_locale
    #define newlocale(mask, locale, base) _create_locale(mask, locale)
    
    #define LC_GLOBAL_LOCALE    ((locale_t)-1)
    #define LC_ALL_MASK            LC_ALL
    #define LC_COLLATE_MASK        LC_COLLATE
    #define LC_CTYPE_MASK        LC_CTYPE
    #define LC_MONETARY_MASK    LC_MONETARY
    #define LC_NUMERIC_MASK        LC_NUMERIC
    #define LC_TIME_MASK        LC_TIME
    
    inline locale_t uselocale(locale_t new_locale)
    {
        // Retrieve the current per thread locale setting
        bool bIsPerThread = (_configthreadlocale(0) == _ENABLE_PER_THREAD_LOCALE);

        // Retrieve the current thread-specific locale
        locale_t old_locale = bIsPerThread ? _get_current_locale() : LC_GLOBAL_LOCALE;

        if(new_locale == LC_GLOBAL_LOCALE)
        {
            // Restore the global locale
            _configthreadlocale(_DISABLE_PER_THREAD_LOCALE);
        }
        else if(new_locale != NULL)
        {
            // Configure the thread to set the locale only for this thread
            _configthreadlocale(_ENABLE_PER_THREAD_LOCALE);

            // Set all locale categories
            for(int i = LC_MIN; i <= LC_MAX; i++)
                setlocale(i, new_locale->locinfo->lc_category[i].locale);
        }

        return old_locale;
    }

// 64 bit offsets for windows
    #define fseeko _fseeki64
    #define ftello _ftelli64
    #define atoll _atoi64
    #define stat64 _stat64
    #define fstat64 _fstat64
    #define fileno _fileno

    #if _M_IX86
        #define Crash() {__asm int 3}
    #else
extern "C" {
    __declspec(dllimport) void __stdcall DebugBreak(void);
}
        #define Crash() {DebugBreak();}
    #endif // M_IX86
#endif // WIN32 ndef

// Dolphin's min and max functions
#undef min
#undef max

template<class T>
inline T min(const T& a, const T& b) {return a > b ? b : a;}
template<class T>
inline T max(const T& a, const T& b) {return a > b ? a : b;}

// Generic function to get last error message.
// Call directly after the command or use the error num.
// This function might change the error code.
// Defined in Misc.cpp.
const char* GetLastErrorMsg();

namespace Common
{
inline u8 swap8(u8 _data) {return _data;}
inline u32 swap24(const u8* _data) {return (_data[0] << 16) | (_data[1] << 8) | _data[2];}

#ifdef ANDROID
#undef swap16
#undef swap32
#undef swap64
#endif

#ifdef _WIN32
inline u16 swap16(u16 _data) {return _byteswap_ushort(_data);}
inline u32 swap32(u32 _data) {return _byteswap_ulong (_data);}
inline u64 swap64(u64 _data) {return _byteswap_uint64(_data);}
#elif _M_ARM
inline u16 swap16 (u16 _data) { u32 data = _data; __asm__ ("rev16 %0, %1\n" : "=l" (data) : "l" (data)); return (u16)data;} 
inline u32 swap32 (u32 _data) {__asm__ ("rev %0, %1\n" : "=l" (_data) : "l" (_data)); return _data;} 
inline u64 swap64(u64 _data) {return ((u64)swap32(_data) << 32) | swap32(_data >> 32);}
#elif __linux__
inline u16 swap16(u16 _data) {return bswap_16(_data);}
inline u32 swap32(u32 _data) {return bswap_32(_data);}
inline u64 swap64(u64 _data) {return bswap_64(_data);}
#elif __APPLE__
inline __attribute__((always_inline)) u16 swap16(u16 _data)
    {return (_data >> 8) | (_data << 8);}
inline __attribute__((always_inline)) u32 swap32(u32 _data)
    {return __builtin_bswap32(_data);}
inline __attribute__((always_inline)) u64 swap64(u64 _data)
    {return __builtin_bswap64(_data);}
#elif __FreeBSD__
inline u16 swap16(u16 _data) {return bswap16(_data);}
inline u32 swap32(u32 _data) {return bswap32(_data);}
inline u64 swap64(u64 _data) {return bswap64(_data);}
#else
// Slow generic implementation.
inline u16 swap16(u16 data) {return (data >> 8) | (data << 8);}
inline u32 swap32(u32 data) {return (swap16(data) << 16) | swap16(data >> 16);}
inline u64 swap64(u64 data) {return ((u64)swap32(data) << 32) | swap32(data >> 32);}
#endif

inline u16 swap16(const u8* _pData) {return swap16(*(const u16*)_pData);}
inline u32 swap32(const u8* _pData) {return swap32(*(const u32*)_pData);}
inline u64 swap64(const u8* _pData) {return swap64(*(const u64*)_pData);}

template <int count>
void swap(u8*);

template <>
inline void swap<1>(u8* data)
{}

template <>
inline void swap<2>(u8* data)
{
    *reinterpret_cast<u16*>(data) = swap16(data);
}

template <>
inline void swap<4>(u8* data)
{
    *reinterpret_cast<u32*>(data) = swap32(data);
}

template <>
inline void swap<8>(u8* data)
{
    *reinterpret_cast<u64*>(data) = swap64(data);
}

template <typename T>
inline T FromBigEndian(T data)
{
    //static_assert(std::is_arithmetic<T>::value, "function only makes sense with arithmetic types");
    
    swap<sizeof(data)>(reinterpret_cast<u8*>(&data));
    return data;
}

}  // Namespace Common

#endif // _COMMONFUNCS_H_
