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 * The Original Code is Mozilla Communicator client code.
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#ifndef nsIUnicodeDecodeHelper_h___
#define nsIUnicodeDecodeHelper_h___

#include "nscore.h"
#include "uconvutil.h"
#include "nsISupports.h"
#include "nsIMappingCache.h"

// Interface ID for our Unicode Decode Helper interface
// {9CC39FF0-DD5D-11d2-8AAC-00600811A836}
#define NS_IUNICODEDECODEHELPER_IID \
{ 0x9cc39ff0, 0xdd5d, 0x11d2, {0x8a, 0xac, 0x0, 0x60, 0x8, 0x11, 0xa8, 0x36}}

// Class ID for our UnicodeDecoderHelper implementation
// {9CC39FF1-DD5D-11d2-8AAC-00600811A836}
#define NS_UNICODEDECODEHELPER_CID \
{  0x9cc39ff1, 0xdd5d, 0x11d2, {0x8a, 0xac, 0x0, 0x60, 0x8, 0x11, 0xa8, 0x36}}

#define NS_UNICODEDECODEHELPER_CONTRACTID "@mozilla.org/intl/unicode/decodehelper;1"

#define NS_ERROR_UDEC_NOHELPER  \
  NS_ERROR_GENERATE_FAILURE(NS_ERROR_MODULE_UCONV, 0x41)

//----------------------------------------------------------------------
// Class nsIUnicodeDecodeHelper [declaration]

/**
 * Interface for a Unicode Decode Helper object.
 * 
 * @created         22/Feb/1999
 * @author  Catalin Rotaru [CATA]
 */
class nsIUnicodeDecodeHelper : public nsISupports
{
public:
   NS_DEFINE_STATIC_IID_ACCESSOR(NS_IUNICODEDECODEHELPER_IID)

  /**
   * Converts data using a lookup table.
   */
  NS_IMETHOD ConvertByTable(const char * aSrc, PRInt32 * aSrcLength, 
      PRUnichar * aDest, PRInt32 * aDestLength, uShiftTable * aShiftTable, 
      uMappingTable * aMappingTable) = 0;

  /**
   * Converts data using a set of lookup tables.
   */
  NS_IMETHOD ConvertByMultiTable(const char * aSrc, PRInt32 * aSrcLength, 
      PRUnichar * aDest, PRInt32 * aDestLength, PRInt32 aTableCount, 
      uRange * aRangeArray, uShiftTable ** aShiftTable, 
      uMappingTable ** aMappingTable) = 0;

  /**
   * Converts data using a fast lookup table.
   */
  NS_IMETHOD ConvertByFastTable(const char * aSrc, PRInt32 * aSrcLength, 
      PRUnichar * aDest, PRInt32 * aDestLength, PRUnichar * aFastTable, 
      PRInt32 aTableSize) = 0;

  /**
   * Create a Mapping Cache
   */

  NS_IMETHOD CreateCache(nsMappingCacheType aType, nsIMappingCache* aResult) = 0;
  /**
   * Destroy a Mapping Cache
   */

  NS_IMETHOD DestroyCache(nsIMappingCache aCache) = 0;


  /**
   * Create a cache-like fast lookup table from a normal one.
   */
  NS_IMETHOD CreateFastTable( uShiftTable * aShiftTable, 
      uMappingTable * aMappingTable, PRUnichar * aFastTable, 
      PRInt32 aTableSize) = 0;
};

#endif /* nsIUnicodeDecodeHelper_h___ */