Debugger support for CRC hash values

// The CRC class is a 4 byte CRC value of a string (ignoring case)
// If CRC_STRINGS is defined in the project's settings you can use GetStr to retrieve the text.
// In that case it will check for CRC conflicts (different strings with same CRC).
// The comparison operators compare the CRC value.
// CRC("")=0
//
// Add this to AUTOEXP.DAT
// CRC=$ADDIN(<path to the DLL>\CRCView.dll,CRCView)
//
// Copyright (C) 2005-2006 Pandemic Studios
//
///////////////////////////////////////////////////////////////////////////////

#ifndef _CRC_H
#define _CRC_H

class CRC
{
public:
	// Constructors
	CRC( void )
	{
	}

	CRC( const CRC &x )
	{
		m_Crc=x.m_Crc;
	}

	CRC( const char *string );

	CRC( unsigned long crc )
	{
		m_Crc=crc;
	}

	// Access
	// Resolves the CRC to a string
	const char *GetStr( void ) const;

	unsigned long GetCRC( void ) const
	{
		return m_Crc;
	}

	// Compare
	bool operator==( const CRC &x ) const
	{
		return m_Crc==x.m_Crc;
	}

	bool operator!=( const CRC &x ) const
	{
		return m_Crc!=x.m_Crc;
	}

	bool operator<( const CRC &x ) const
	{
		return m_Crc<x.m_Crc;
	}

	bool operator>( const CRC &x ) const
	{
		return m_Crc>x.m_Crc;
	}

	bool operator<=( const CRC &x ) const
	{
		return m_Crc<=x.m_Crc;
	}

	bool operator>=( const CRC &x ) const
	{
		return m_Crc>=x.m_Crc;
	}

	// Appends a string to the end
	void Append( const char *string );

	// Returns true if it is an empty CRC
	bool IsEmpty( void ) const
	{
		return m_Crc==0;
	}

private:
	unsigned long m_Crc;
};

//Given a data buffer and it's size, calculates the CRC code for it.
unsigned long CalcCRC( const void *buffer, int size, unsigned long crc=0 );

//Given a string, calculates the CRC code for it, ignore case.
unsigned long CalcCRCNoCase( const char *buffer, unsigned long crc=0 );

#endif