CWE-ou-minkata/Sources/Plasma/PubUtilLib/plEncryption/plChecksum.h

/*==LICENSE==*

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*==LICENSE==*/
#ifndef PL_CHECKSUM_H
#define PL_CHECKSUM_H

#include "hsTypes.h"
#include "openssl/md5.h"

class plChecksum
{
public:
	typedef UInt32 SumStorage;
private:
	SumStorage fSum;
public:
	plChecksum(unsigned int bufsize, const char* buffer);
	static int GetChecksumSize() { return sizeof(SumStorage); }
	static int GetWindowSize() { return sizeof(SumStorage); }
	SumStorage GetChecksum() { return fSum; }
};

class hsStream;

class plMD5Checksum 
{
	protected:

		hsBool	fValid;
		MD5_CTX	fContext;
		UInt8	fChecksum[ MD5_DIGEST_LENGTH ];

		UInt8	IHexCharToInt( char c ) const;

	public:

		plMD5Checksum( UInt32 size, UInt8 *buffer );
		plMD5Checksum();
		plMD5Checksum( const plMD5Checksum &rhs );
		plMD5Checksum( const char *fileName );
		plMD5Checksum( hsStream* stream );

		hsBool	IsValid( void ) const { return fValid; }
		void	Clear();

		void	CalcFromFile( const char *fileName );
 		void	CalcFromStream( hsStream* stream );

		void	Start( void );
		void	AddTo( UInt32 size, const UInt8 *buffer );
		void	Finish( void );

		const UInt8	*GetValue( void ) const { return fChecksum; }
		UInt32		GetSize( void ) const { return sizeof( fChecksum ); }

		// Backdoor for cached checksums (ie, if you loaded it off disk)
		void SetValue(UInt8* checksum);

		// Note: GetAsHexString() returns a pointer to a static string; do not rely on the contents of this string between calls!
		const char	*GetAsHexString( void ) const;
		void		SetFromHexString( const char *string );

		bool	operator==( const plMD5Checksum &rhs ) const;
		bool	operator!=( const plMD5Checksum &rhs ) const { return !operator==( rhs ); }
};
#endif // PL_CHECKSUM_H