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 /**
 * A character set converter from Unicode to GBK.
 * 
 *
 * @created         08/Sept/1999
 * @author  Yueheng Xu, Yueheng.Xu@intel.com
 */

#ifndef nsUnicodeToGBK_h___
#define nsUnicodeToGBK_h___

#include "nsUCSupport.h"
#include "nsCOMPtr.h"
#include "nsIUnicodeEncoder.h"
#include "gbku.h"
//----------------------------------------------------------------------
// Class nsUnicodeToGBK [declaration]

class nsUnicodeToGBK: public nsEncoderSupport
{
public:

  /**
   * Class constructor.
   */
  nsUnicodeToGBK(PRUint32 aMaxLengthFactor = 2);
  virtual ~nsUnicodeToGBK() {}

protected:

  //--------------------------------------------------------------------
  // Subclassing of nsEncoderSupport class [declaration]
  NS_IMETHOD ConvertNoBuff(const PRUnichar * aSrc, 
                            PRInt32 * aSrcLength, 
                            char * aDest, 
                            PRInt32 * aDestLength);

  NS_IMETHOD ConvertNoBuffNoErr(const PRUnichar * aSrc, PRInt32 * aSrcLength, 
                                char * aDest, PRInt32 * aDestLength)
  {
    return NS_OK;
  }  // just make it not abstract;

  virtual void CreateExtensionEncoder();
  virtual void Create4BytesEncoder();

  nsCOMPtr<nsIUnicodeEncoder> mExtensionEncoder;
  nsCOMPtr<nsIUnicodeEncoder> m4BytesEncoder;
protected:
  PRUnichar mSurrogateHigh;
  nsGBKConvUtil mUtil;
  PRBool TryExtensionEncoder(PRUnichar aChar, char* aDest, PRInt32* aOutLen);
  PRBool Try4BytesEncoder(PRUnichar aChar, char* aDest, PRInt32* aOutLen);
  virtual PRBool EncodeSurrogate(PRUnichar aSurrogateHigh, PRUnichar aSurrogateLow, char* aDest);
};

class nsUnicodeToGB18030: public nsUnicodeToGBK
{
public:
  nsUnicodeToGB18030() : nsUnicodeToGBK(4) {}
  virtual ~nsUnicodeToGB18030() {}
protected:
  virtual void CreateExtensionEncoder();
  virtual void Create4BytesEncoder();
  virtual PRBool EncodeSurrogate(PRUnichar aSurrogateHigh, PRUnichar aSurrogateLow, char* aDest);
};

#endif /* nsUnicodeToGBK_h___ */

