240 lines
9.7 KiB
C++
240 lines
9.7 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Copyright (C) Microsoft Corporation, 1997-1998.
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//
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// File: unaligned.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 UNALIGNED 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 UNALIGNED type, use the MAKE_UNALIGNED_TYPE macro. For example, if
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// you need an int_UNALIGNED, say
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//
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// MAKE_UNALIGNED_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 UNALIGNED" in your code
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// with "type_UNALIGNED". 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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// UNALIGNED64: 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 __unaligned_h__
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#define __unaligned_h__
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#if defined (_MSC_VER) || defined(__APOGEE__)
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#define MAKE_UNALIGNED_TYPE(base,size) typedef base UNALIGNED base##_UNALIGNED
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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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#ifdef SPARC
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#define MAKE_UNALIGNED64_TYPE(base,size) typedef base base##_UNALIGNED64
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#else
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#define MAKE_UNALIGNED64_TYPE(base,size) typedef base UNALIGNED base##_UNALIGNED64
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#endif // SPARC
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#define MAKE_UNALIGNEDPTR_TYPE(base) typedef base UNALIGNED *base##_UNALIGNEDPTR
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#else // defined (_MSC_VER) || defined(__APOGEE__)
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#ifdef BIG_ENDIAN
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#define SET2(val,data) \
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data[0] = (val) >> 8, \
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data[1] = (val)
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#define GET2(data) \
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( ( data[0] << 8 ) | \
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( data[1] ) )
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#define SET4(val,data) \
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data[0] = (val) >> 24, \
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data[1] = (val) >> 16, \
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data[2] = (val) >> 8, \
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data[3] = (val)
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#define GET4(data) \
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( ( data[0] << 24 ) | \
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( data[1] << 16 ) | \
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( data[2] << 8 ) | \
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( data[3] ) )
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#define SET8(val,data) \
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data[0] = (val) >> 56, \
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data[1] = (val) >> 48, \
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data[2] = (val) >> 40, \
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data[3] = (val) >> 32 \
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data[4] = (val) >> 24, \
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data[5] = (val) >> 16, \
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data[6] = (val) >> 8, \
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data[7] = (val)
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#define GET8(data) \
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( ( data[0] << 56 ) | \
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( data[1] << 48 ) | \
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( data[2] << 40 ) | \
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( data[3] << 32 ) | \
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( data[4] << 24 ) | \
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( data[5] << 16 ) | \
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( data[6] << 8 ) | \
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( data[7] ) )
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#define SET648(val,data) \
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data[0] = (val) >> 32, \
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data[1] = (val)
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#define GET648(data) \
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( ( data[0] << 32 ) | \
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( data[1] ) )
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#else
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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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#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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#endif
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#define GROUP(type,size,get,set,sfx) \
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Unaligned##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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#define MAKE_TEMPLATE(size,type,sfx) \
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template<class BASE> \
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class Unaligned##sfx##size<BASE> \
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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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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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MAKE_TEMPLATE( 8, unsigned int, 64 );
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template<class BASE>
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class UnalignedPtr<BASE> : Unaligned4<BASE> {
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public:
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UnalignedPtr<BASE>(const void * v) : Unaligned4<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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#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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#define MAKE_UNALIGNED_TYPE(base,size) typedef Unaligned##size<base> base##_UNALIGNED
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#define MAKE_UNALIGNED64_TYPE(base,size) typedef Unaligned64##size<base> base##_UNALIGNED64
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#define MAKE_UNALIGNEDPTR_TYPE(base) typedef UnalignedPtr<base> * base##_UNALIGNEDPTR
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#endif // _MSC_VER
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// Predefine some of the basic types.
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MAKE_UNALIGNED_TYPE( short, 2 );
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MAKE_UNALIGNED_TYPE( int, 4 );
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MAKE_UNALIGNED_TYPE( long, 4 );
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MAKE_UNALIGNED_TYPE( WORD, 2 );
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MAKE_UNALIGNED_TYPE( DWORD, 4 );
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MAKE_UNALIGNED_TYPE( USHORT, 4 );
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MAKE_UNALIGNED_TYPE( SHORT, 4 );
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MAKE_UNALIGNED_TYPE( __int64, 8 );
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MAKE_UNALIGNED64_TYPE( __int64, 8 );
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#endif __unaligned_h__
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