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 *
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#include "nsIFactory.h"
#include "nsString.h"
#include "nsISaveAsCharset.h"


#define MASK_FALLBACK(a) (nsISaveAsCharset::mask_Fallback & (a))
#define MASK_ENTITY(a) (nsISaveAsCharset::mask_Entity & (a))
#define ATTR_NO_FALLBACK(a) (nsISaveAsCharset::attr_FallbackNone == MASK_FALLBACK(a) && \
                             nsISaveAsCharset::attr_EntityAfterCharsetConv != MASK_ENTITY(a))

class nsIUnicodeEncoder;
class nsIEntityConverter;

class nsSaveAsCharset : public nsISaveAsCharset
{
public:
	
	//
	// implementation methods
	//
  nsSaveAsCharset();
  virtual ~nsSaveAsCharset();

	//
	// nsISupports
	//
	NS_DECL_ISUPPORTS

	//
	// nsIEntityConverter
	//
  NS_IMETHOD Init(const char *charset, PRUint32 attr, PRUint32 entityVersion);

  NS_IMETHOD Convert(const PRUnichar *inString, char **_retval);

protected:

  NS_IMETHOD DoCharsetConversion(const PRUnichar *inString, char **outString);

  NS_IMETHOD DoConversionFallBack(PRUnichar inCharacter, char *outString, PRInt32 bufferLength);

  // do the fallback, reallocate the buffer if necessary
  // need to pass destination buffer info (size, current position and estimation of rest of the conversion)
  NS_IMETHOD HandleFallBack(PRUnichar character, char **outString, PRInt32 *bufferLength, 
                            PRInt32 *currentPos, PRInt32 estimatedLength);


  PRUint32 mAttribute;                    // conversion attribute
  PRUint32 mEntityVersion;                // see nsIEntityConverter
  nsIUnicodeEncoder *mEncoder;            // encoder (convert from unicode)
  nsIEntityConverter *mEntityConverter;
};


nsresult NS_NewSaveAsCharset(nsISupports **inst);