49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
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// Copyright (c) 1999 Microsoft Corporation. All Rights Reserved.
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#ifndef crc32_h
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#define crc32_h
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// initial CRC should be 0xffffffff
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class CRC32
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{
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public:
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CRC32( DWORD in) : m_crc32( in ) {};
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CRC32() : m_crc32( 0xffffffff ) {};
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CRC32( const CRC32& in ) : m_crc32( in.m_crc32 ) {};
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CRC32(const void* pPtr, unsigned dwNumBytes);
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template <class T>
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CRC32(const T* pPtr) : m_crc32( 0xffffffff )
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{ Update( pPtr ); }
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DWORD Update( BYTE bNextByte );
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DWORD Update( const void* pPtr, unsigned dwNumBytes );
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// template version for adding a structure, data type, or class
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// do not add classes with virtual functions
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template <class T>
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DWORD Update( const T* pPtr )
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{ return Update( pPtr, sizeof(*pPtr));}
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// a conversion operator is used instead of a 'Get' method so
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// that you can use declarations like " DWORD myCRC = CRC32(ptr,len)"
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//
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// This class can be used like a function or as an object
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//
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// For example:
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// CRC32 myCRC32;
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// myCRC32.Update( ptr, len );
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// DWORD myValue = myCRC32;
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//
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// CRC32 myCRC32(ptr1, len1 );
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// myCRC32.Update(ptr2, len2 );
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//
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// DWORD myValue = CRC32(ptr, len )
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//
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operator DWORD() const { return m_crc32; };
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protected:
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DWORD m_crc32;
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};
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#endif // CRC32
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