/* This file is part of pr-downloader (GPL v2 or later), see the LICENSE file */

#ifndef _CCHECKSUM_H
#define _CCHECKSUM_H

#include <string>
#include <assert.h>

class IHash
{
public:
	/**
  *	Init Hash
  */
	virtual void Init() = 0;
	/**
  * abstract base classes should always have virtual dtors
  */
	virtual ~IHash()
	{
	}
	/**
  *	Finalize Hash
  */
	virtual void Final() = 0;
	/**
  *	Update Hash with given data
  */
	virtual void Update(const char* data, const int size) = 0;
	/**
  *	return human readable hash string
  */
	virtual const std::string toString(const unsigned char* data = NULL,
					   int size = 0);
	/**
  *	compare this hash
  *	@return true, when both hashes are identical
  */
	virtual bool compare(const IHash* checksum);
	/**
  *	compare this hash
  *	@return true, when both hashes are identical
  */
	virtual bool compare(const unsigned char* data, int size);
	/**
  * Set the md5 hash
  */
	virtual bool Set(const unsigned char* data, int size) = 0;

	virtual bool Set(const std::string& hash);
	/**
  *	returns the size of binary hash for comparison
  */
	virtual int getSize() const = 0;
	/**
  *	returns true, if a hash is set/calculated
  */
	virtual bool isSet();
	/**
  *	@return part of binary hash store for comparison
  */
	virtual unsigned char get(int pos) const = 0;

protected:
	bool isset;

private:
	/**
  * convert hex to int
  */
	unsigned getVal(char c);
};

#endif
