235 lines
9.5 KiB
C++
235 lines
9.5 KiB
C++
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//+---------------------------------------------------------------------------
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//
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// Copyright (C) Microsoft Corporation, 1997.
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//
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// File: lendian.hpp
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//
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// Contents: Templatized data types for access to unaligned scalar values.
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//
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//----------------------------------------------------------------------------
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// Implementation of LENDIAN data values. This works for simple scalar values.
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// This file is heavily macro-based. The intent is to do this work with arithmetic.
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// The functionality may be expressed much more consisely with memcpy, but I need an
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// implementation faster than that.
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// To create an LENDIAN type, use the MAKE_LENDIAN_TYPE macro. For example, if
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// you need an int_LENDIAN, say
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//
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// MAKE_LENDIAN_TYPE( int, 4 );
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//
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// Note that you need to specifiy the size of the base type. This is because the
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// amount of work to be done needs to be known by the preprocessor, where sizeof()
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// doesn't work.
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// To use: The intent is that replace occurances of "type LENDIAN" in your code
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// with "type_LENDIAN". It's simply a lexical change. You could automate this
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// change in order to easily convert code. More importantly, the reverse
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// transformation may also be easily automated, making it easier to merge with code
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// that doesn't use these types.
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// LENDIAN64: The unaligned 64 types are an optimization. They should only be used
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// for values over four bytes in size (e.g. __int64, double). They assume that the
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// pointers are aligned to 4-bytes, so that access may be done with two 32-bit
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// references, instead of 8 8-bit references.
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#ifndef __lendian_h__
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#define __lendian_h__
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#if defined(_MSC_VER) && !defined(BIG_ENDIAN)
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#define MAKE_LENDIAN_UNALIGNED_TYPE(base,size) typedef base UNALIGNED base##_LENDIAN_UNALIGNED
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#define MAKE_LENDIAN_TYPE(base,size) typedef base base##_LENDIAN_UNALIGNED; \
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typedef base base##_LENDIAN \
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//
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// Use MAKE_UNALIGNED64_TYPE for QWORD data that may only be DWORD aligned on 64-bit
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// machines. Only 64-bit architectures pay the penalty for accessing such data.
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//
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#if defined(ALPHA)
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# define MAKE_LENDIAN64_UNALIGNED_TYPE(base,size) typedef base UNALIGNED base##_LENDIAN64_UNALIGNED
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#else
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# define MAKE_LENDIAN64_UNALIGNED_TYPE(base,size) typedef base base##_LENDIAN64_UNALIGNED
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#endif
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#define MAKE_LENDIAN64_TYPE(base,size) typedef base base##_LENDIAN64
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#define MAKE_LENDIANPTR_UNALIGNED_TYPE(base) typedef base UNALIGNED *base##_LENDIANPTR_UNALIGNED
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#define MAKE_LENDIANPTR_TYPE(base) typedef base *base##_LENDIANPTR
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#else // _MSC_VER
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#define SET2(val,data) \
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data[1] = (val) >> 8, \
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data[0] = (val)
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#define GET2(data) \
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( ( data[1] << 8 ) | \
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( data[0] ) )
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#define SET4(val,data) \
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data[3] = (val) >> 24, \
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data[2] = (val) >> 16, \
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data[1] = (val) >> 8, \
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data[0] = (val)
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#define GET4(data) \
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( ( data[3] << 24 ) | \
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( data[2] << 16 ) | \
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( data[1] << 8 ) | \
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( data[0] ) )
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#define SET8(val,data) \
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data[7] = (val) >> 56, \
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data[6] = (val) >> 48, \
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data[5] = (val) >> 40, \
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data[4] = (val) >> 32, \
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data[3] = (val) >> 24, \
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data[2] = (val) >> 16, \
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data[1] = (val) >> 8, \
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data[0] = (val)
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#define GET8(data) \
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( ( data[7] << 56 ) | \
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( data[6] << 48 ) | \
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( data[5] << 40 ) | \
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( data[4] << 32 ) | \
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( data[3] << 24 ) | \
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( data[2] << 16 ) | \
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( data[1] << 8 ) | \
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( data[0] ) )
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#if defined( ux10 )
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#define SET02(x,y) SET2(x,y)
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#define GET02(x) GET2(x)
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#define SET04(x,y) SET4(x,y)
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#define GET04(x) GET4(x)
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#define SET08(x,y) SET8(x,y)
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#define GET08(x) GET8(x)
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#endif
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#define SET648(val,data) \
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data[1] = (val) >> 32, \
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data[0] = (val)
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#define GET648(data) \
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( ( data[1] << 32 ) | \
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( data[0] ) )
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#define GROUP(type,size,get,set,sfx) \
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LEndian##sfx##size( type v ) { set##size( v, data ); } \
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type operator = ( type v ) { set##size( v, data ); return v; } \
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operator type() { return get##size( data ); } \
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type operator += (const type v) { set##size( get##size(data) + v, data); return *this; } \
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type operator -= (const type v) { set##size( get##size(data) - v, data); return *this; } \
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type operator <<= (const type v) { set##size( get##size(data) << v, data); return *this; } \
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type operator <= (const type v) { set##size( get##size(data) < v, data); return *this; } \
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type operator >= (const type v) { set##size( get##size(data) > v, data); return *this; } \
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type operator *= (const type v) { set##size( get##size(data) * v, data); return *this; } \
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type operator /= (const type v) { set##size( get##size(data) / v, data); return *this; } \
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type operator %= (const type v) { set##size( get##size(data) % v, data); return *this; } \
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type operator >>= (const type v) { set##size( get##size(data) >> v, data); return *this; } \
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type operator ^= (const type v) { set##size( get##size(data) ^ v, data); return *this; } \
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type operator &= (const type v) { set##size( get##size(data) & v, data); return *this; } \
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type operator |= (const type v) { set##size( get##size(data) | v, data); return *this; }
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#define MAKE_TEMPLATE(size,type,sfx) \
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template<class BASE> \
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class LEndian##sfx##size \
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{ \
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protected: \
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type data[ size / sizeof(type) ]; \
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\
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public: \
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\
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GROUP( signed char, size, GET##sfx, SET##sfx, sfx ) \
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GROUP( short, size, GET##sfx, SET##sfx, sfx ) \
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GROUP( int, size, GET##sfx, SET##sfx, sfx ) \
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GROUP( wchar_t, size, GET##sfx, SET##sfx, sfx ) \
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GROUP( long, size, GET##sfx, SET##sfx, sfx ) \
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GROUP( __int64, size, GET##sfx, SET##sfx, sfx ) \
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GROUP( unsigned char, size, GET##sfx, SET##sfx, sfx ) \
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GROUP( unsigned short, size, GET##sfx, SET##sfx, sfx ) \
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GROUP( unsigned int, size, GET##sfx, SET##sfx, sfx ) \
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GROUP( unsigned long, size, GET##sfx, SET##sfx, sfx ) \
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GROUP( unsigned __int64, size, GET##sfx, SET##sfx, sfx ) \
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}
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#if defined( ux10 )
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MAKE_TEMPLATE( 2, unsigned char, 0);
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MAKE_TEMPLATE( 4, unsigned char, 0);
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MAKE_TEMPLATE( 8, unsigned char, 0);
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#else
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MAKE_TEMPLATE( 2, unsigned char, );
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MAKE_TEMPLATE( 4, unsigned char, );
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MAKE_TEMPLATE( 8, unsigned char, );
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#endif
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MAKE_TEMPLATE( 8, unsigned int, 64 );
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#if defined( ux10 )
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template<class BASE>
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class LEndianPtr : LEndian04<BASE> {
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public:
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LEndianPtr(const void * v) : LEndian04<BASE>((int)v) { }
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void *operator = (void * v) { SET4((int)v,data); return v; }
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const void *operator = (const void * v) { SET4((int)v,data); return v; }
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operator BASE() { return (BASE)GET4(data); }
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};
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#else
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template<class BASE>
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class LEndianPtr : LEndian4<BASE> {
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public:
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LEndianPtr(const void * v) : LEndian4<BASE>((int)v) { }
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void *operator = (void * v) { SET4((int)v,data); return v; }
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const void *operator = (const void * v) { SET4((int)v,data); return v; }
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operator BASE() { return (BASE)GET4(data); }
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};
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#endif
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#undef SET2
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#undef SET4
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#undef SET8
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#undef SET648
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#undef GROUP
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#undef MAKE_TEMPLATE
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#if defined( ux10 )
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#define MAKE_LENDIAN_TYPE(base,size) \
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typedef LEndian0##size<base> base##_LENDIAN; \
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typedef LEndian0##size<base> base##_LENDIAN_UNALIGNED
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#else
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#define MAKE_LENDIAN_TYPE(base,size) \
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typedef LEndian##size<base> base##_LENDIAN; \
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typedef LEndian##size<base> base##_LENDIAN_UNALIGNED
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#endif
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#define MAKE_LENDIAN64_TYPE(base,size) \
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typedef LEndian64##size<base> base##_LENDIAN64; \
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typedef LEndian64##size<base> base##_LENDIAN64_UNALIGNED
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#define MAKE_LENDIANPTR_TYPE(base) \
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typedef LEndianPtr<base> base##_LENDIANPTR; \
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typedef LEndianPtr<base> base##_LENDIANPTR_UNALIGNED
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#endif // _MSC_VER
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// Predefine some of the basic types.
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MAKE_LENDIAN_TYPE( short, 2 );
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MAKE_LENDIAN_TYPE( int, 4 );
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MAKE_LENDIAN_TYPE( long, 4 );
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MAKE_LENDIAN_TYPE( WORD, 2 );
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MAKE_LENDIAN_TYPE( DWORD, 4 );
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MAKE_LENDIAN_TYPE( USHORT, 4 );
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MAKE_LENDIAN_TYPE( SHORT, 4 );
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MAKE_LENDIAN_TYPE( __int64, 8 );
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MAKE_LENDIAN64_TYPE( __int64, 8 );
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#endif // __lendian_h__
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