/usr/include/podofo/base/PdfFiltersPrivate.h is in libpodofo-dev 0.9.4-6.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Copyright (C) 2007 by Dominik Seichter *
* domseichter@web.de *
* *
* This program is free software; you can redistribute it and/or modify *
* it under the terms of the GNU Library General Public License as *
* published by the Free Software Foundation; either version 2 of the *
* License, or (at your option) any later version. *
* *
* This program is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU Library General Public *
* License along with this program; if not, write to the *
* Free Software Foundation, Inc., *
* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
* *
* In addition, as a special exception, the copyright holders give *
* permission to link the code of portions of this program with the *
* OpenSSL library under certain conditions as described in each *
* individual source file, and distribute linked combinations *
* including the two. *
* You must obey the GNU General Public License in all respects *
* for all of the code used other than OpenSSL. If you modify *
* file(s) with this exception, you may extend this exception to your *
* version of the file(s), but you are not obligated to do so. If you *
* do not wish to do so, delete this exception statement from your *
* version. If you delete this exception statement from all source *
* files in the program, then also delete it here. *
***************************************************************************/
#ifndef _PDF_FILTERS_PRIVATE_H_
#define _PDF_FILTERS_PRIVATE_H_
/**
* \file PdfFiltersPrivate.h
*
* Provides implementations of various PDF stream filters.
*
* This is an internal header. It should not be included in podofo.h, and
* should not be included directly by client applications. These filters should
* only be accessed through the factory interface in PdfFilters.h .
*/
#include "PdfDefines.h"
#include "PdfDefinesPrivate.h"
#include "PdfFilter.h"
#include "PdfRefCountedBuffer.h"
#include <zlib.h>
#ifdef PODOFO_HAVE_JPEG_LIB
extern "C" {
#ifdef _WIN32 // Collision between win and jpeg-headers
#define XMD_H
#undef FAR
#endif
#include "jpeglib.h"
}
#endif // PODOFO_HAVE_JPEG_LIB
#ifdef PODOFO_HAVE_TIFF_LIB
extern "C" {
#include "tiffio.h"
#ifdef _WIN32 // Collision between tiff and jpeg-headers
#define XMD_H
#undef FAR
#endif
}
#endif // PODOFO_HAVE_TIFF_LIB
namespace PoDoFo {
#define PODOFO_FILTER_INTERNAL_BUFFER_SIZE 4096
class PdfPredictorDecoder;
class PdfOutputDevice;
/** The ascii hex filter.
*/
class PdfHexFilter : public PdfFilter {
public:
virtual ~PdfHexFilter() { }
/** Check wether the encoding is implemented for this filter.
*
* \returns true if the filter is able to encode data
*/
inline virtual bool CanEncode() const;
/** Encode a block of data and write it to the PdfOutputStream
* specified by BeginEncodeImpl.
*
* BeginEncodeImpl() has to be called before this function.
*
* \param pBuffer pointer to a buffer with data to encode
* \param lLen length of data to encode.
*
* Call EndEncodeImpl() after all data has been encoded
*
*
* \see BeginEncodeImpl
* \see EndEncodeImpl
*/
virtual void EncodeBlockImpl( const char* pBuffer, pdf_long lLen );
/** Check wether the decoding is implemented for this filter.
*
* \returns true if the filter is able to decode data
*/
inline virtual bool CanDecode() const;
/** Real implementation of `BeginDecode()'. NEVER call this method directly.
*
* By default this function does nothing. If your filter needs to do setup for decoding,
* you should override this method.
*
* PdfFilter ensures that a valid stream is available when this method is called, and
* that EndDecode() was called since the last BeginDecode()/DecodeBlock().
*
* \see BeginDecode */
virtual void BeginDecodeImpl( const PdfDictionary* );
/** Real implementation of `DecodeBlock()'. NEVER call this method directly.
*
* You must override this method to decode the buffer passed by the caller.
*
* You are not obliged to immediately process any or all of the data in
* the passed buffer, but you must ensure that you have processed it and
* written it out by the end of EndDecodeImpl(). You must copy the buffer
* if you're going to store it, as ownership is not transferred to the
* filter and the caller may free the buffer at any time.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, ensures that BeginDecode() has been called, and ensures that
* EndDecode() has not been called since the last BeginDecode().
*
* \see DecodeBlock */
virtual void DecodeBlockImpl( const char* pBuffer, pdf_long lLen );
/** Real implementation of `EndDecode()'. NEVER call this method directly.
*
* By the time this method returns, all filtered data must be written to the stream
* and the filter must be in a state where BeginDecode() can be safely called.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, and ensures that BeginDecodeImpl() has been called.
*
* \see EndDecode */
virtual void EndDecodeImpl();
/** GetType of this filter.
* \returns the GetType of this filter
*/
inline virtual EPdfFilter GetType() const;
private:
char m_cDecodedByte;
bool m_bLow;
};
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfHexFilter::CanEncode() const
{
return true;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfHexFilter::CanDecode() const
{
return true;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
EPdfFilter PdfHexFilter::GetType() const
{
return ePdfFilter_ASCIIHexDecode;
}
/** The Ascii85 filter.
*/
class PdfAscii85Filter : public PdfFilter {
public:
virtual ~PdfAscii85Filter() { }
/** Check wether the encoding is implemented for this filter.
*
* \returns true if the filter is able to encode data
*/
inline virtual bool CanEncode() const;
/** Begin encoding data using this filter. Called by PdfFilter::BeginEncode.
*
* \see EncodeBlockImpl
* \see EndEncodeImpl
* \see PdfFilter::BeginEncode
*/
virtual void BeginEncodeImpl();
/** Encode a block of data and write it to the PdfOutputStream
* specified by BeginEncodeImpl.
*
* BeginEncodeImpl() has to be called before this function.
*
* \param pBuffer pointer to a buffer with data to encode
* \param lLen length of data to encode.
*
* Call EndEncodeImpl() after all data has been encoded
*
*
* \see BeginEncodeImpl
* \see EndEncodeImpl
*/
virtual void EncodeBlockImpl( const char* pBuffer, pdf_long lLen );
/**
* Finish encoding of data.
*
* \see BeginEncodeImpl
* \see EncodeBlockImpl
*/
virtual void EndEncodeImpl();
/** Check wether the decoding is implemented for this filter.
*
* \returns true if the filter is able to decode data
*/
inline virtual bool CanDecode() const;
/** Real implementation of `BeginDecode()'. NEVER call this method directly.
*
* By default this function does nothing. If your filter needs to do setup for decoding,
* you should override this method.
*
* PdfFilter ensures that a valid stream is available when this method is called, and
* that EndDecode() was called since the last BeginDecode()/DecodeBlock().
*
* \see BeginDecode */
virtual void BeginDecodeImpl( const PdfDictionary* );
/** Real implementation of `DecodeBlock()'. NEVER call this method directly.
*
* You must override this method to decode the buffer passed by the caller.
*
* You are not obliged to immediately process any or all of the data in
* the passed buffer, but you must ensure that you have processed it and
* written it out by the end of EndDecodeImpl(). You must copy the buffer
* if you're going to store it, as ownership is not transferred to the
* filter and the caller may free the buffer at any time.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, ensures that BeginDecode() has been called, and ensures that
* EndDecode() has not been called since the last BeginDecode().
*
* \see DecodeBlock */
virtual void DecodeBlockImpl( const char* pBuffer, pdf_long lLen );
/** Real implementation of `EndDecode()'. NEVER call this method directly.
*
* By the time this method returns, all filtered data must be written to the stream
* and the filter must be in a state where BeginDecode() can be safely called.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, and ensures that BeginDecodeImpl() has been called.
*
* \see EndDecode */
virtual void EndDecodeImpl();
/** GetType of this filter.
* \returns the GetType of this filter
*/
inline virtual EPdfFilter GetType() const;
private:
void EncodeTuple ( unsigned long tuple, int bytes );
void WidePut( unsigned long tuple, int bytes ) const;
private:
int m_count;
unsigned long m_tuple;
};
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfAscii85Filter::CanEncode() const
{
return true;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfAscii85Filter::CanDecode() const
{
return true;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
EPdfFilter PdfAscii85Filter::GetType() const
{
return ePdfFilter_ASCII85Decode;
}
/** The flate filter.
*/
class PdfFlateFilter : public PdfFilter {
public:
PdfFlateFilter();
virtual ~PdfFlateFilter();
/** Check wether the encoding is implemented for this filter.
*
* \returns true if the filter is able to encode data
*/
inline virtual bool CanEncode() const;
/** Begin encoding data using this filter. Called by PdfFilter::BeginEncode.
*
* \see EncodeBlockImpl
* \see EndEncodeImpl
* \see PdfFilter::BeginEncode
*/
virtual void BeginEncodeImpl();
/** Encode a block of data and write it to the PdfOutputStream
* specified by BeginEncodeImpl.
*
* BeginEncodeImpl() has to be called before this function.
*
* \param pBuffer pointer to a buffer with data to encode
* \param lLen length of data to encode.
*
* Call EndEncodeImpl() after all data has been encoded
*
*
* \see BeginEncodeImpl
* \see EndEncodeImpl
*/
virtual void EncodeBlockImpl( const char* pBuffer, pdf_long lLen );
/**
* Finish encoding of data.
*
* \see BeginEncodeImpl
* \see EncodeBlockImpl
*/
virtual void EndEncodeImpl();
/** Check wether the decoding is implemented for this filter.
*
* \returns true if the filter is able to decode data
*/
inline virtual bool CanDecode() const;
/** Real implementation of `BeginDecode()'. NEVER call this method directly.
*
* By default this function does nothing. If your filter needs to do setup for decoding,
* you should override this method.
*
* PdfFilter ensures that a valid stream is available when this method is called, and
* that EndDecode() was called since the last BeginDecode()/DecodeBlock().
*
* \param pDecodeParms additional parameters for decoding data
*
* \see BeginDecode
*/
virtual void BeginDecodeImpl( const PdfDictionary* pDecodeParms );
/** Real implementation of `DecodeBlock()'. NEVER call this method directly.
*
* You must override this method to decode the buffer passed by the caller.
*
* You are not obliged to immediately process any or all of the data in
* the passed buffer, but you must ensure that you have processed it and
* written it out by the end of EndDecodeImpl(). You must copy the buffer
* if you're going to store it, as ownership is not transferred to the
* filter and the caller may free the buffer at any time.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, ensures that BeginDecode() has been called, and ensures that
* EndDecode() has not been called since the last BeginDecode().
*
* \see DecodeBlock */
virtual void DecodeBlockImpl( const char* pBuffer, pdf_long lLen );
/** Real implementation of `EndDecode()'. NEVER call this method directly.
*
* By the time this method returns, all filtered data must be written to the stream
* and the filter must be in a state where BeginDecode() can be safely called.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, and ensures that BeginDecodeImpl() has been called.
*
* \see EndDecode */
virtual void EndDecodeImpl();
/** GetType of this filter.
* \returns the GetType of this filter
*/
inline virtual EPdfFilter GetType() const;
private:
void EncodeBlockInternal( const char* pBuffer, pdf_long lLen, int nMode );
private:
unsigned char m_buffer[PODOFO_FILTER_INTERNAL_BUFFER_SIZE];
z_stream m_stream;
PdfPredictorDecoder* m_pPredictor;
};
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfFlateFilter::CanEncode() const
{
return true;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfFlateFilter::CanDecode() const
{
return true;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
EPdfFilter PdfFlateFilter::GetType() const
{
return ePdfFilter_FlateDecode;
}
/** The RLE filter.
*/
class PdfRLEFilter : public PdfFilter {
public:
virtual ~PdfRLEFilter() {}
/** Check wether the encoding is implemented for this filter.
*
* \returns true if the filter is able to encode data
*/
inline virtual bool CanEncode() const;
virtual void BeginEncodeImpl();
/** Encode a block of data and write it to the PdfOutputStream
* specified by BeginEncodeImpl.
*
* BeginEncodeImpl() has to be called before this function.
*
* \param pBuffer pointer to a buffer with data to encode
* \param lLen length of data to encode.
*
* Call EndEncodeImpl() after all data has been encoded
*
*
* \see BeginEncodeImpl
* \see EndEncodeImpl
*/
virtual void EncodeBlockImpl( const char* pBuffer, pdf_long lLen );
/**
* Finish encoding of data.
*
* \see BeginEncodeImpl
* \see EncodeBlockImpl
*/
virtual void EndEncodeImpl();
/** Check wether the decoding is implemented for this filter.
*
* \returns true if the filter is able to decode data
*/
inline virtual bool CanDecode() const;
/** Real implementation of `BeginDecode()'. NEVER call this method directly.
*
* By default this function does nothing. If your filter needs to do setup for decoding,
* you should override this method.
*
* PdfFilter ensures that a valid stream is available when this method is called, and
* that EndDecode() was called since the last BeginDecode()/DecodeBlock().
*
* \see BeginDecode */
virtual void BeginDecodeImpl( const PdfDictionary* );
/** Real implementation of `DecodeBlock()'. NEVER call this method directly.
*
* You must override this method to decode the buffer passed by the caller.
*
* You are not obliged to immediately process any or all of the data in
* the passed buffer, but you must ensure that you have processed it and
* written it out by the end of EndDecodeImpl(). You must copy the buffer
* if you're going to store it, as ownership is not transferred to the
* filter and the caller may free the buffer at any time.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, ensures that BeginDecode() has been called, and ensures that
* EndDecode() has not been called since the last BeginDecode().
*
* \see DecodeBlock */
virtual void DecodeBlockImpl( const char* pBuffer, pdf_long lLen );
/** GetType of this filter.
* \returns the GetType of this filter
*/
inline virtual EPdfFilter GetType() const;
private:
int m_nCodeLen;
};
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfRLEFilter::CanEncode() const
{
return false;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfRLEFilter::CanDecode() const
{
return true;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
EPdfFilter PdfRLEFilter::GetType() const
{
return ePdfFilter_RunLengthDecode;
}
/** The LZW filter.
*/
class PdfLZWFilter : public PdfFilter {
struct TLzwItem {
std::vector<unsigned char> value;
};
typedef std::vector<TLzwItem> TLzwTable;
typedef TLzwTable::iterator TILzwTable;
typedef TLzwTable::const_iterator TCILzwTable;
public:
PdfLZWFilter();
virtual ~PdfLZWFilter();
/** Check wether the encoding is implemented for this filter.
*
* \returns true if the filter is able to encode data
*/
inline virtual bool CanEncode() const;
/** Begin encoding data using this filter. Called by PdfFilter::BeginEncode.
*
* \see EncodeBlockImpl
* \see EndEncodeImpl
* \see PdfFilter::BeginEncode
*/
virtual void BeginEncodeImpl();
/** Encode a block of data and write it to the PdfOutputStream
* specified by BeginEncodeImpl.
*
* BeginEncodeImpl() has to be called before this function.
*
* \param pBuffer pointer to a buffer with data to encode
* \param lLen length of data to encode.
*
* Call EndEncodeImpl() after all data has been encoded
*
*
* \see BeginEncodeImpl
* \see EndEncodeImpl
*/
virtual void EncodeBlockImpl( const char* pBuffer, pdf_long lLen );
/**
* Finish encoding of data.
*
* \see BeginEncodeImpl
* \see EncodeBlockImpl
*/
virtual void EndEncodeImpl();
/** Check wether the decoding is implemented for this filter.
*
* \returns true if the filter is able to decode data
*/
inline virtual bool CanDecode() const;
/** Real implementation of `BeginDecode()'. NEVER call this method directly.
*
* By default this function does nothing. If your filter needs to do setup for decoding,
* you should override this method.
*
* PdfFilter ensures that a valid stream is available when this method is called, and
* that EndDecode() was called since the last BeginDecode()/DecodeBlock().
*
* \see BeginDecode */
virtual void BeginDecodeImpl( const PdfDictionary* );
/** Real implementation of `DecodeBlock()'. NEVER call this method directly.
*
* You must override this method to decode the buffer passed by the caller.
*
* You are not obliged to immediately process any or all of the data in
* the passed buffer, but you must ensure that you have processed it and
* written it out by the end of EndDecodeImpl(). You must copy the buffer
* if you're going to store it, as ownership is not transferred to the
* filter and the caller may free the buffer at any time.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, ensures that BeginDecode() has been called, and ensures that
* EndDecode() has not been called since the last BeginDecode().
*
* \see DecodeBlock */
virtual void DecodeBlockImpl( const char* pBuffer, pdf_long lLen );
/** Real implementation of `EndDecode()'. NEVER call this method directly.
*
* By the time this method returns, all filtered data must be written to the stream
* and the filter must be in a state where BeginDecode() can be safely called.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, and ensures that BeginDecodeImpl() has been called.
*
* \see EndDecode */
virtual void EndDecodeImpl();
/** GetType of this filter.
* \returns the GetType of this filter
*/
inline virtual EPdfFilter GetType() const;
private:
/** Initialize an lzw table.
*/
void InitTable();
private:
static const unsigned short s_masks[4];
static const unsigned short s_clear;
static const unsigned short s_eod;
TLzwTable m_table;
unsigned int m_mask;
unsigned int m_code_len;
unsigned char m_character;
bool m_bFirst;
PdfPredictorDecoder* m_pPredictor;
};
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfLZWFilter::CanEncode() const
{
return false;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfLZWFilter::CanDecode() const
{
return true;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
EPdfFilter PdfLZWFilter::GetType() const
{
return ePdfFilter_LZWDecode;
}
#ifdef PODOFO_HAVE_JPEG_LIB
void PODOFO_API jpeg_memory_src (j_decompress_ptr cinfo, const JOCTET * buffer, size_t bufsize);
extern "C" {
void JPegErrorExit(j_common_ptr cinfo);
void JPegErrorOutput(j_common_ptr, int);
};
/** The DCT filter can decoded JPEG compressed data.
*
* This filter requires JPEG lib to be available
*/
class PdfDCTFilter : public PdfFilter {
public:
PdfDCTFilter();
virtual ~PdfDCTFilter();
/** Check wether the encoding is implemented for this filter.
*
* \returns true if the filter is able to encode data
*/
inline virtual bool CanEncode() const;
/** Begin encoding data using this filter. Called by PdfFilter::BeginEncode.
*
* \see EncodeBlockImpl
* \see EndEncodeImpl
* \see PdfFilter::BeginEncode
*/
virtual void BeginEncodeImpl();
/** Encode a block of data and write it to the PdfOutputStream
* specified by BeginEncodeImpl.
*
* BeginEncodeImpl() has to be called before this function.
*
* \param pBuffer pointer to a buffer with data to encode
* \param lLen length of data to encode.
*
* Call EndEncodeImpl() after all data has been encoded
*
*
* \see BeginEncodeImpl
* \see EndEncodeImpl
*/
virtual void EncodeBlockImpl( const char* pBuffer, pdf_long lLen );
/**
* Finish encoding of data.
*
* \see BeginEncodeImpl
* \see EncodeBlockImpl
*/
virtual void EndEncodeImpl();
/** Check wether the decoding is implemented for this filter.
*
* \returns true if the filter is able to decode data
*/
inline virtual bool CanDecode() const;
/** Real implementation of `BeginDecode()'. NEVER call this method directly.
*
* By default this function does nothing. If your filter needs to do setup for decoding,
* you should override this method.
*
* PdfFilter ensures that a valid stream is available when this method is called, and
* that EndDecode() was called since the last BeginDecode()/DecodeBlock().
*
* \see BeginDecode */
virtual void BeginDecodeImpl( const PdfDictionary* );
/** Real implementation of `DecodeBlock()'. NEVER call this method directly.
*
* You must override this method to decode the buffer passed by the caller.
*
* You are not obliged to immediately process any or all of the data in
* the passed buffer, but you must ensure that you have processed it and
* written it out by the end of EndDecodeImpl(). You must copy the buffer
* if you're going to store it, as ownership is not transferred to the
* filter and the caller may free the buffer at any time.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, ensures that BeginDecode() has been called, and ensures that
* EndDecode() has not been called since the last BeginDecode().
*
* \see DecodeBlock */
virtual void DecodeBlockImpl( const char* pBuffer, pdf_long lLen );
/** Real implementation of `EndDecode()'. NEVER call this method directly.
*
* By the time this method returns, all filtered data must be written to the stream
* and the filter must be in a state where BeginDecode() can be safely called.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, and ensures that BeginDecodeImpl() has been called.
*
* \see EndDecode */
virtual void EndDecodeImpl();
/** GetType of this filter.
* \returns the GetType of this filter
*/
inline virtual EPdfFilter GetType() const;
private:
struct jpeg_decompress_struct m_cinfo;
struct jpeg_error_mgr m_jerr;
PdfRefCountedBuffer m_buffer;
PdfOutputDevice* m_pDevice;
};
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfDCTFilter::CanEncode() const
{
return false;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfDCTFilter::CanDecode() const
{
return true;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
EPdfFilter PdfDCTFilter::GetType() const
{
return ePdfFilter_DCTDecode;
}
#endif // PODOFO_HAVE_JPEG_LIB
#ifdef PODOFO_HAVE_TIFF_LIB
/** The CCITT filter can decoded CCITTFaxDecode compressed data.
*
* This filter requires TIFFlib to be available
*/
class PdfCCITTFilter : public PdfFilter {
public:
PdfCCITTFilter();
virtual ~PdfCCITTFilter();
/** Check wether the encoding is implemented for this filter.
*
* \returns true if the filter is able to encode data
*/
inline virtual bool CanEncode() const;
/** Begin encoding data using this filter. Called by PdfFilter::BeginEncode.
*
* \see EncodeBlockImpl
* \see EndEncodeImpl
* \see PdfFilter::BeginEncode
*/
virtual void BeginEncodeImpl();
/** Encode a block of data and write it to the PdfOutputStream
* specified by BeginEncodeImpl.
*
* BeginEncodeImpl() has to be called before this function.
*
* \param pBuffer pointer to a buffer with data to encode
* \param lLen length of data to encode.
*
* Call EndEncodeImpl() after all data has been encoded
*
*
* \see BeginEncodeImpl
* \see EndEncodeImpl
*/
virtual void EncodeBlockImpl( const char* pBuffer, pdf_long lLen );
/**
* Finish encoding of data.
*
* \see BeginEncodeImpl
* \see EncodeBlockImpl
*/
virtual void EndEncodeImpl();
/** Check wether the decoding is implemented for this filter.
*
* \returns true if the filter is able to decode data
*/
inline virtual bool CanDecode() const;
/** Real implementation of `BeginDecode()'. NEVER call this method directly.
*
* By default this function does nothing. If your filter needs to do setup for decoding,
* you should override this method.
*
* PdfFilter ensures that a valid stream is available when this method is called, and
* that EndDecode() was called since the last BeginDecode()/DecodeBlock().
*
* \see BeginDecode */
virtual void BeginDecodeImpl( const PdfDictionary* );
/** Real implementation of `DecodeBlock()'. NEVER call this method directly.
*
* You must override this method to decode the buffer passed by the caller.
*
* You are not obliged to immediately process any or all of the data in
* the passed buffer, but you must ensure that you have processed it and
* written it out by the end of EndDecodeImpl(). You must copy the buffer
* if you're going to store it, as ownership is not transferred to the
* filter and the caller may free the buffer at any time.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, ensures that BeginDecode() has been called, and ensures that
* EndDecode() has not been called since the last BeginDecode().
*
* \see DecodeBlock */
virtual void DecodeBlockImpl( const char* pBuffer, pdf_long lLen );
/** Real implementation of `EndDecode()'. NEVER call this method directly.
*
* By the time this method returns, all filtered data must be written to the stream
* and the filter must be in a state where BeginDecode() can be safely called.
*
* PdfFilter ensures that a valid stream is available when this method is
* called, and ensures that BeginDecodeImpl() has been called.
*
* \see EndDecode */
virtual void EndDecodeImpl();
/** GetType of this filter.
* \returns the GetType of this filter
*/
inline virtual EPdfFilter GetType() const;
private:
TIFF* m_tiff;
};
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfCCITTFilter::CanEncode() const
{
return false;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
bool PdfCCITTFilter::CanDecode() const
{
return true;
}
// -----------------------------------------------------
//
// -----------------------------------------------------
EPdfFilter PdfCCITTFilter::GetType() const
{
return ePdfFilter_CCITTFaxDecode;
}
#endif // PODOFO_HAVE_TIFF_LIB
};
#endif /* _PDF_FILTERS_PRIVATE_H_ */
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