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 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 );

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

        void    CalcFromFile( const char *fileName );

        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