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