/* CpuArch.h
 2008-08-05
 Igor Pavlov
 Public domain */
 
 #ifndef __CPUARCH_H
 #define __CPUARCH_H
 
 /*
 LITTLE_ENDIAN_UNALIGN means:
   1) CPU is LITTLE_ENDIAN
   2) it's allowed to make unaligned memory accesses
 if LITTLE_ENDIAN_UNALIGN is not defined, it means that we don't know
 about these properties of platform.
 */
 
 #if defined(_M_IX86) || defined(_M_X64) || defined(_M_AMD64) || defined(__i386__) || defined(__x86_64__)
 #define LITTLE_ENDIAN_UNALIGN
 #endif
 
 #ifdef LITTLE_ENDIAN_UNALIGN
 
 #define GetUi16(p) (*(const UInt16 *)(p))
 #define GetUi32(p) (*(const UInt32 *)(p))
 #define GetUi64(p) (*(const UInt64 *)(p))
 #define SetUi32(p, d) *(UInt32 *)(p) = (d);
 
 #else
 
 #define GetUi16(p) (((const Byte *)(p))[0] | ((UInt16)((const Byte *)(p))[1] << 8))
 
 #define GetUi32(p) ( \
              ((const Byte *)(p))[0]        | \
     ((UInt32)((const Byte *)(p))[1] <<  8) | \
     ((UInt32)((const Byte *)(p))[2] << 16) | \
     ((UInt32)((const Byte *)(p))[3] << 24))
 
 #define GetUi64(p) (GetUi32(p) | ((UInt64)GetUi32(((const Byte *)(p)) + 4) << 32))
 
 #define SetUi32(p, d) { UInt32 _x_ = (d); \
     ((Byte *)(p))[0] = (Byte)_x_; \
     ((Byte *)(p))[1] = (Byte)(_x_ >> 8); \
     ((Byte *)(p))[2] = (Byte)(_x_ >> 16); \
     ((Byte *)(p))[3] = (Byte)(_x_ >> 24); }
 
 #endif
 
 #if defined(LITTLE_ENDIAN_UNALIGN) && defined(_WIN64) && (_MSC_VER >= 1300)
 
 #pragma intrinsic(_byteswap_ulong)
 #pragma intrinsic(_byteswap_uint64)
 #define GetBe32(p) _byteswap_ulong(*(const UInt32 *)(const Byte *)(p))
 #define GetBe64(p) _byteswap_uint64(*(const UInt64 *)(const Byte *)(p))
 
 #else
 
 #define GetBe32(p) ( \
     ((UInt32)((const Byte *)(p))[0] << 24) | \
     ((UInt32)((const Byte *)(p))[1] << 16) | \
     ((UInt32)((const Byte *)(p))[2] <<  8) | \
              ((const Byte *)(p))[3] )
 
 #define GetBe64(p) (((UInt64)GetBe32(p) << 32) | GetBe32(((const Byte *)(p)) + 4))
 
 #endif
 
 #define GetBe16(p) (((UInt16)((const Byte *)(p))[0] << 8) | ((const Byte *)(p))[1])
 
 #endif