intl/uconv/ucvcn/nsUnicodeToGBK.h

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  37
  38  /**
  39  * A character set converter from Unicode to GBK.
  40  *
  41  *
  42  * @created         08/Sept/1999
  43  * @author  Yueheng Xu, Yueheng.Xu@intel.com
  44  */
  45
  46 #ifndef nsUnicodeToGBK_h___
  47 #define nsUnicodeToGBK_h___
  48
  49 #include "nsUCSupport.h"
  50 #include "nsCOMPtr.h"
  51 #include "nsIUnicodeEncoder.h"
  52 #include "gbku.h"
  53 //----------------------------------------------------------------------
  54 // Class nsUnicodeToGBK [declaration]
  55
  56 class nsUnicodeToGBK: public nsEncoderSupport
  57 {
  58 public:
  59
  60   /**
  61    * Class constructor.
  62    */
  63   nsUnicodeToGBK(PRUint32 aMaxLengthFactor = 2);
  64   virtual ~nsUnicodeToGBK() {}
  65
  66 protected:
  67
  68   //--------------------------------------------------------------------
  69   // Subclassing of nsEncoderSupport class [declaration]
  70   NS_IMETHOD ConvertNoBuff(const PRUnichar * aSrc,
  71                             PRInt32 * aSrcLength,
  72                             char * aDest,
  73                             PRInt32 * aDestLength);
  74
  75   NS_IMETHOD ConvertNoBuffNoErr(const PRUnichar * aSrc, PRInt32 * aSrcLength,
  76                                 char * aDest, PRInt32 * aDestLength)
  77   {
  78     return NS_OK;
  79   }  // just make it not abstract;
  80
  81   NS_IMETHOD FillInfo(PRUint32 *aInfo);
  82
  83   virtual void CreateExtensionEncoder();
  84   virtual void Create4BytesEncoder();
  85
  86   nsCOMPtr<nsIUnicodeEncoder> mExtensionEncoder;
  87   nsCOMPtr<nsIUnicodeEncoder> m4BytesEncoder;
  88 protected:
  89   PRUnichar mSurrogateHigh;
  90   nsGBKConvUtil mUtil;
  91   PRBool TryExtensionEncoder(PRUnichar aChar, char* aDest, PRInt32* aOutLen);
  92   PRBool Try4BytesEncoder(PRUnichar aChar, char* aDest, PRInt32* aOutLen);
  93   virtual PRBool EncodeSurrogate(PRUnichar aSurrogateHigh, PRUnichar aSurrogateLow, char* aDest);
  94 };
  95
  96 class nsUnicodeToGB18030: public nsUnicodeToGBK
  97 {
  98 public:
  99   nsUnicodeToGB18030() : nsUnicodeToGBK(4) {}
 100   virtual ~nsUnicodeToGB18030() {}
 101 protected:
 102   virtual void CreateExtensionEncoder();
 103   virtual void Create4BytesEncoder();
 104   virtual PRBool EncodeSurrogate(PRUnichar aSurrogateHigh, PRUnichar aSurrogateLow, char* aDest);
 105 };
 106
 107 #endif /* nsUnicodeToGBK_h___ */
 108