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      1 // Copyright 2014 PDFium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
      6 
      7 #ifndef _FDE_TXTEDTBUF_H
      8 #define _FDE_TXTEDTBUF_H
      9 class IFX_CharIter;
     10 class CFDE_TxtEdtBufIter;
     11 class CFDE_TxtEdtBuf;
     12 class CFDE_TxtEdtBufIter : public IFX_CharIter {
     13  public:
     14 #ifdef FDE_USEFORMATBLOCK
     15   CFDE_TxtEdtBufIter(CFDE_TxtEdtBuf* pBuf, FX_BOOL bForDisplay = TRUE);
     16 #else
     17   CFDE_TxtEdtBufIter(CFDE_TxtEdtBuf* pBuf, FX_WCHAR wcAlias = 0);
     18 #endif
     19 
     20   virtual void Release();
     21   virtual FX_BOOL Next(FX_BOOL bPrev = FALSE);
     22   virtual FX_WCHAR GetChar();
     23   virtual void SetAt(int32_t nIndex);
     24   virtual int32_t GetAt() const;
     25   virtual FX_BOOL IsEOF(FX_BOOL bTail = TRUE) const;
     26   virtual IFX_CharIter* Clone();
     27 
     28  protected:
     29   ~CFDE_TxtEdtBufIter();
     30 
     31  private:
     32   CFDE_TxtEdtBuf* m_pBuf;
     33   int32_t m_nCurChunk;
     34   int32_t m_nCurIndex;
     35   int32_t m_nIndex;
     36 #ifdef FDE_USEFORMATBLOCK
     37   FX_BOOL m_bForDisplay;
     38   int32_t m_nAliasCount;
     39 #endif
     40   FX_WCHAR m_Alias;
     41 };
     42 class CFDE_TxtEdtBuf : public IFDE_TxtEdtBuf {
     43   friend class CFDE_TxtEdtBufIter;
     44   struct _FDE_CHUNKHEADER {
     45     int32_t nUsed;
     46     FX_WCHAR wChars[1];
     47   };
     48   typedef _FDE_CHUNKHEADER FDE_CHUNKHEADER;
     49   typedef _FDE_CHUNKHEADER* FDE_LPCHUNKHEADER;
     50   struct _FDE_CHUNKPLACE {
     51     int32_t nChunkIndex;
     52     int32_t nCharIndex;
     53   };
     54   typedef _FDE_CHUNKPLACE FDE_CHUNKPLACE;
     55   typedef _FDE_CHUNKPLACE* FDE_LPCHUNKPLACE;
     56 
     57  public:
     58   CFDE_TxtEdtBuf(int32_t nDefChunkSize = FDE_DEFCHUNKLENGTH);
     59 
     60   virtual void Release();
     61   virtual FX_BOOL SetChunkSize(int32_t nChunkSize);
     62   virtual int32_t GetChunkSize() const;
     63   virtual int32_t GetTextLength() const;
     64   virtual void SetText(const CFX_WideString& wsText);
     65   virtual void GetText(CFX_WideString& wsText) const;
     66   virtual FX_WCHAR GetCharByIndex(int32_t nIndex) const;
     67   virtual void GetRange(CFX_WideString& wsText,
     68                         int32_t nBegine,
     69                         int32_t nCount = -1) const;
     70 
     71   virtual void Insert(int32_t nPos,
     72                       const FX_WCHAR* lpText,
     73                       int32_t nLength = 1);
     74   virtual void Delete(int32_t nIndex, int32_t nLength = 1);
     75   virtual void Clear(FX_BOOL bRelease = TRUE);
     76 
     77   virtual FX_BOOL Optimize(IFX_Pause* pPause = NULL);
     78 
     79  protected:
     80   virtual ~CFDE_TxtEdtBuf();
     81 
     82  private:
     83   void ResetChunkBuffer(int32_t nDefChunkCount, int32_t nChunkSize);
     84   int32_t CP2Index(const FDE_CHUNKPLACE& cp) const;
     85   void Index2CP(int32_t nIndex, FDE_CHUNKPLACE& cp) const;
     86 
     87   int32_t m_nChunkSize;
     88 
     89   int32_t m_nTotal;
     90   FX_BOOL m_bChanged;
     91   CFX_PtrArray m_Chunks;
     92   IFX_MEMAllocator* m_pAllocator;
     93 };
     94 #endif
     95