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#ifndef nsGBK2312ToUnicode_h___
#define nsGBK2312ToUnicode_h___

#include "nsCOMPtr.h"
#include "nsIUnicodeDecoder.h"
#include "nsUCSupport.h"
#include "gbku.h"

//----------------------------------------------------------------------
// Class nsGBKToUnicode [declaration]

/**
 * A character set converter from GBK to Unicode.
 * 
 *
 * @created         07/Sept/1999
 * @author  Yueheng Xu, Yueheng.Xu@intel.com
 */
class nsGBKToUnicode : public nsBufferDecoderSupport
{
public:
		  
  /**
   * Class constructor.
   */
  nsGBKToUnicode() : nsBufferDecoderSupport(1)
  {
    mExtensionDecoder = nsnull;
    m4BytesDecoder = nsnull;
  }

protected:

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

protected:
  nsGBKConvUtil mUtil;
  nsCOMPtr<nsIUnicodeDecoder> mExtensionDecoder;
  nsCOMPtr<nsIUnicodeDecoder> m4BytesDecoder;

  virtual void CreateExtensionDecoder();
  virtual void Create4BytesDecoder();
  PRBool TryExtensionDecoder(const char* aSrc, PRUnichar* aDest);
  PRBool Try4BytesDecoder(const char* aSrc, PRUnichar* aDest);
  virtual PRBool DecodeToSurrogate(const char* aSrc, PRUnichar* aDest);

};


class nsGB18030ToUnicode : public nsGBKToUnicode
{
public:
  nsGB18030ToUnicode() {}
  virtual ~nsGB18030ToUnicode() {}
protected:
  virtual void CreateExtensionDecoder();
  virtual void Create4BytesDecoder();
  virtual PRBool DecodeToSurrogate(const char* aSrc, PRUnichar* aDest);
};

#endif /* nsGBK2312ToUnicode_h___ */

