mirror of
https://github.com/qpdf/qpdf.git
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9744414c66
This commit adds several API methods that enable control over which types of filters QPDF will attempt to decode. It also adds support for /RunLengthDecode and /DCTDecode filters for both encoding and decoding.
71 lines
2.3 KiB
C++
71 lines
2.3 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*,
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unsigned long encode_flags,
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qpdf_stream_decode_level_e decode_level,
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bool suppress_warnings);
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PointerHolder<Buffer> getStreamData(qpdf_stream_decode_level_e);
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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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bool& specialized_compression, bool& lossy_compression,
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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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