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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 class CPDF_DecryptFilter : public CFX_DataFilter
      8 {
      9 public:
     10     CPDF_DecryptFilter(CPDF_CryptoHandler* pCryptoHandler, FX_DWORD objnum, FX_DWORD gennum);
     11     virtual ~CPDF_DecryptFilter();
     12     virtual	void	v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf);
     13     virtual void	v_FilterFinish(CFX_BinaryBuf& dest_buf);
     14     CPDF_CryptoHandler*	m_pCryptoHandler;
     15     FX_LPVOID		m_pContext;
     16     FX_DWORD		m_ObjNum, m_GenNum;
     17 };
     18 class CPDF_FlateFilter : public CFX_DataFilter
     19 {
     20 public:
     21     CPDF_FlateFilter();
     22     virtual ~CPDF_FlateFilter();
     23     virtual	void	v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf);
     24     virtual void	v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
     25     void*			m_pContext;
     26     FX_BYTE			m_DestBuffer[FPDF_FILTER_BUFFER_SIZE];
     27 };
     28 class CPDF_LzwFilter : public CFX_DataFilter
     29 {
     30 public:
     31     CPDF_LzwFilter(FX_BOOL bEarlyChange);
     32     virtual ~CPDF_LzwFilter() {}
     33     virtual	void	v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf);
     34     virtual void	v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
     35     FX_BOOL			m_bEarlyChange;
     36     FX_DWORD		m_CodeArray[5021];
     37     FX_DWORD		m_nCodes;
     38     FX_DWORD		m_CodeLen;
     39     FX_DWORD		m_OldCode;
     40     FX_BYTE			m_LastChar;
     41     FX_DWORD		m_nLeftBits, m_LeftBits;
     42     FX_BYTE			m_DecodeStack[4000];
     43     FX_DWORD		m_StackLen;
     44     void			AddCode(FX_DWORD prefix_code, FX_BYTE append_char);
     45     void			DecodeString(FX_DWORD code);
     46 };
     47 class CPDF_PredictorFilter : public CFX_DataFilter
     48 {
     49 public:
     50     CPDF_PredictorFilter(int predictor, int colors, int bpc, int cols);
     51     virtual ~CPDF_PredictorFilter();
     52     virtual	void	v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf);
     53     virtual void	v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
     54     FX_BOOL			m_bTiff;
     55     FX_DWORD		m_Pitch, m_Bpp;
     56     FX_LPBYTE		m_pRefLine, m_pCurLine;
     57     FX_DWORD		m_iLine, m_LineInSize;
     58 };
     59 class CPDF_AsciiHexFilter : public CFX_DataFilter
     60 {
     61 public:
     62     CPDF_AsciiHexFilter();
     63     virtual ~CPDF_AsciiHexFilter() {}
     64     virtual	void	v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf);
     65     virtual void	v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
     66     int				m_State;
     67     int				m_FirstDigit;
     68 };
     69 class CPDF_Ascii85Filter : public CFX_DataFilter
     70 {
     71 public:
     72     CPDF_Ascii85Filter();
     73     virtual ~CPDF_Ascii85Filter() {}
     74     virtual	void	v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf);
     75     virtual void	v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
     76     int				m_State;
     77     int				m_CharCount;
     78     FX_DWORD		m_CurDWord;
     79 };
     80 class CPDF_RunLenFilter : public CFX_DataFilter
     81 {
     82 public:
     83     CPDF_RunLenFilter();
     84     virtual ~CPDF_RunLenFilter() {}
     85     virtual	void	v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf);
     86     virtual void	v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
     87     int				m_State;
     88     FX_DWORD		m_Count;
     89 };
     90 class CPDF_JpegFilter : public CFX_DataFilter
     91 {
     92 public:
     93     CPDF_JpegFilter();
     94     virtual ~CPDF_JpegFilter();
     95     virtual	void	v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf);
     96     virtual void	v_FilterFinish(CFX_BinaryBuf& dest_buf) {}
     97     void*			m_pContext;
     98     CFX_BinaryBuf	m_InputBuf;
     99     FX_LPBYTE		m_pScanline;
    100     int				m_Pitch, m_Height, m_Width, m_nComps, m_iLine;
    101     FX_BOOL			m_bGotHeader;
    102 };
    103 class CPDF_FaxFilter : public CFX_DataFilter
    104 {
    105 public:
    106     CPDF_FaxFilter();
    107     virtual ~CPDF_FaxFilter();
    108     FX_BOOL			Initialize(int Encoding, int bEndOfLine, int bByteAlign, int bBlack, int nRows, int nColumns);
    109     virtual	void	v_FilterIn(FX_LPCBYTE src_buf, FX_DWORD src_size, CFX_BinaryBuf& dest_buf);
    110     virtual void	v_FilterFinish(CFX_BinaryBuf& dest_buf);
    111     int				m_Encoding, m_bEndOfLine, m_bByteAlign, m_bBlack;
    112     int				m_nRows, m_nColumns, m_Pitch, m_iRow;
    113     FX_LPBYTE		m_pScanlineBuf, m_pRefBuf;
    114     CFX_BinaryBuf	m_InputBuf;
    115     int				m_InputBitPos;
    116     void			ProcessData(FX_LPCBYTE src_buf, FX_DWORD src_size, int& bitpos, FX_BOOL bFinish,
    117                                 CFX_BinaryBuf& dest_buf);
    118     FX_BOOL			ReadLine(FX_LPCBYTE src_buf, int bitsize, int& bitpos);
    119 };
    120