Line data    Source code

       1             : /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
       2             : /* This Source Code Form is subject to the terms of the Mozilla Public
       3             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       4             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
       5             : #ifndef nsCharSetProber_h__
       6             : #define nsCharSetProber_h__
       7             : 
       8             : #include "nscore.h"
       9             : 
      10             : //#define DEBUG_chardet // Uncomment this for debug dump.
      11             : 
      12             : typedef enum {
      13             :   eDetecting = 0,   //We are still detecting, no sure answer yet, but caller can ask for confidence.
      14             :   eFoundIt = 1,     //That's a positive answer
      15             :   eNotMe = 2        //Negative answer
      16             : } nsProbingState;
      17             : 
      18             : #define SHORTCUT_THRESHOLD      (float)0.95
      19             : 
      20           0 : class nsCharSetProber {
      21             : public:
      22           0 :   virtual ~nsCharSetProber() {}
      23             :   virtual const char* GetCharSetName() = 0;
      24             :   virtual nsProbingState HandleData(const char* aBuf, uint32_t aLen) = 0;
      25             :   virtual nsProbingState GetState(void) = 0;
      26             :   virtual void      Reset(void)  = 0;
      27             :   virtual float     GetConfidence(void) = 0;
      28             : 
      29             : #ifdef DEBUG_chardet
      30             :   virtual void  DumpStatus() {};
      31             : #endif
      32             : 
      33             :   // Helper functions used in the Latin1 and Group probers.
      34             :   // both functions Allocate a new buffer for newBuf. This buffer should be
      35             :   // freed by the caller using free().
      36             :   // Both functions return false in case of memory allocation failure.
      37             :   static bool FilterWithoutEnglishLetters(const char* aBuf, uint32_t aLen, char** newBuf, uint32_t& newLen);
      38             :   static bool FilterWithEnglishLetters(const char* aBuf, uint32_t aLen, char** newBuf, uint32_t& newLen);
      39             : 
      40             : };
      41             : 
      42             : #endif /* nsCharSetProber_h__ */