/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Netscape Public License
 * Version 1.1 (the "License"); you may not use this file except in
 * compliance with the License. You may obtain a copy of the License at
 * http://www.mozilla.org/NPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is 
 * Netscape Communications Corporation.
 * Portions created by the Initial Developer are Copyright (C) 1998
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the NPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the NPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

#include "nsIFactory.h"
#include "nsString.h"
#include "nsVoidArray.h"
#include "nsICharsetConverterManager.h"
#include "nsISaveAsCharset.h"


#define MASK_FALLBACK(a) (nsISaveAsCharset::mask_Fallback & (a))
#define MASK_ENTITY(a) (nsISaveAsCharset::mask_Entity & (a))
#define MASK_CHARSET_FALLBACK(a) (nsISaveAsCharset::mask_CharsetFallback & (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);

  NS_IMETHODIMP GetCharset(char * *aCharset);

protected:

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

  NS_IMETHOD DoConversionFallBack(PRUint32 inUCS4, 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(PRUint32 character, char **outString, PRInt32 *bufferLength, 
                            PRInt32 *currentPos, PRInt32 estimatedLength);

  nsresult SetupUnicodeEncoder(const char* charset);

  nsresult SetupCharsetList(const char *charsetList);

  const char * GetNextCharset();

  PRUint32 mAttribute;                    // conversion attribute
  PRUint32 mEntityVersion;                // see nsIEntityConverter
  nsCOMPtr<nsIUnicodeEncoder> mEncoder;   // encoder (convert from unicode)
  nsCOMPtr<nsIEntityConverter> mEntityConverter;
  nsCStringArray mCharsetList;
  PRInt32        mCharsetListIndex;
};


nsresult NS_NewSaveAsCharset(nsISupports **inst);

