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When requested, QPDFWriter will do more aggress prechecking of streams to make sure it can actually succeed in decoding them before attempting to do so. This will allow preservation of raw data even when the raw data is corrupted relative to the specified filters.
69 lines
2.2 KiB
C++
69 lines
2.2 KiB
C++
#ifndef __QPDF_STREAM_HH__
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#define __QPDF_STREAM_HH__
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#include <qpdf/Types.h>
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#include <qpdf/QPDFObject.hh>
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#include <qpdf/QPDFObjectHandle.hh>
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class Pipeline;
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class QPDF;
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class QPDF_Stream: public QPDFObject
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{
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public:
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QPDF_Stream(QPDF*, int objid, int generation,
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QPDFObjectHandle stream_dict,
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qpdf_offset_t offset, size_t length);
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virtual ~QPDF_Stream();
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virtual std::string unparse();
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virtual QPDFObject::object_type_e getTypeCode() const;
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virtual char const* getTypeName() const;
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QPDFObjectHandle getDict() const;
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// See comments in QPDFObjectHandle.hh for these methods.
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bool pipeStreamData(Pipeline*, bool filter,
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bool normalize, bool compress,
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bool suppress_warnings);
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PointerHolder<Buffer> getStreamData();
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PointerHolder<Buffer> getRawStreamData();
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void replaceStreamData(PointerHolder<Buffer> data,
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QPDFObjectHandle const& filter,
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QPDFObjectHandle const& decode_parms);
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void replaceStreamData(
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PointerHolder<QPDFObjectHandle::StreamDataProvider> provider,
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QPDFObjectHandle const& filter,
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QPDFObjectHandle const& decode_parms);
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void replaceDict(QPDFObjectHandle new_dict);
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// Replace object ID and generation. This may only be called if
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// object ID and generation are 0. It is used by QPDFObjectHandle
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// when adding streams to files.
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void setObjGen(int objid, int generation);
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private:
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static std::map<std::string, std::string> filter_abbreviations;
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void replaceFilterData(QPDFObjectHandle const& filter,
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QPDFObjectHandle const& decode_parms,
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size_t length);
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bool understandDecodeParams(
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std::string const& filter, QPDFObjectHandle decode_params,
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int& predictor, int& columns, bool& early_code_change);
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bool filterable(std::vector<std::string>& filters,
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int& predictor, int& columns, bool& early_code_change);
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void warn(QPDFExc const& e);
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QPDF* qpdf;
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int objid;
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int generation;
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QPDFObjectHandle stream_dict;
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qpdf_offset_t offset;
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size_t length;
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PointerHolder<Buffer> stream_data;
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PointerHolder<QPDFObjectHandle::StreamDataProvider> stream_provider;
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};
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#endif // __QPDF_STREAM_HH__
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