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cb769c62e5
This comment expands all tabs using an 8-character tab-width. You should ignore this commit when using git blame or use git blame -w. In the early days, I used to use tabs where possible for indentation, since emacs did this automatically. In recent years, I have switched to only using spaces, which means qpdf source code has been a mixture of spaces and tabs. I have avoided cleaning this up because of not wanting gratuitous whitespaces change to cloud the output of git blame, but I changed my mind after discussing with users who view qpdf source code in editors/IDEs that have other tab widths by default and in light of the fact that I am planning to start applying automatic code formatting soon.
692 lines
19 KiB
C++
692 lines
19 KiB
C++
#include <qpdf/QPDF_Stream.hh>
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#include <qpdf/QUtil.hh>
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#include <qpdf/Pipeline.hh>
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#include <qpdf/Pl_Flate.hh>
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#include <qpdf/Pl_Buffer.hh>
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#include <qpdf/Pl_Count.hh>
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#include <qpdf/ContentNormalizer.hh>
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#include <qpdf/QTC.hh>
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#include <qpdf/QPDF.hh>
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#include <qpdf/QPDFExc.hh>
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#include <qpdf/Pl_QPDFTokenizer.hh>
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#include <qpdf/QIntC.hh>
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#include <qpdf/SF_FlateLzwDecode.hh>
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#include <qpdf/SF_DCTDecode.hh>
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#include <qpdf/SF_RunLengthDecode.hh>
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#include <qpdf/SF_ASCII85Decode.hh>
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#include <qpdf/SF_ASCIIHexDecode.hh>
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#include <stdexcept>
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class SF_Crypt: public QPDFStreamFilter
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{
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public:
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SF_Crypt() = default;
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virtual ~SF_Crypt() = default;
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virtual bool setDecodeParms(QPDFObjectHandle decode_parms)
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{
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if (decode_parms.isNull())
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{
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return true;
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}
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bool filterable = true;
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for (auto const& key: decode_parms.getKeys())
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{
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if (((key == "/Type") || (key == "/Name")) &&
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((! decode_parms.hasKey("/Type")) ||
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decode_parms.isDictionaryOfType("/CryptFilterDecodeParms")))
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{
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// we handle this in decryptStream
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}
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else
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{
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filterable = false;
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}
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}
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return filterable;
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}
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virtual Pipeline* getDecodePipeline(Pipeline*)
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{
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// Not used -- handled by pipeStreamData
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return nullptr;
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}
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};
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std::map<std::string, std::string> QPDF_Stream::filter_abbreviations = {
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// The PDF specification provides these filter abbreviations for
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// use in inline images, but according to table H.1 in the pre-ISO
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// versions of the PDF specification, Adobe Reader also accepts
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// them for stream filters.
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{"/AHx", "/ASCIIHexDecode"},
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{"/A85", "/ASCII85Decode"},
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{"/LZW", "/LZWDecode"},
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{"/Fl", "/FlateDecode"},
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{"/RL", "/RunLengthDecode"},
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{"/CCF", "/CCITTFaxDecode"},
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{"/DCT", "/DCTDecode"},
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};
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std::map<
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std::string,
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std::function<std::shared_ptr<QPDFStreamFilter>()>>
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QPDF_Stream::filter_factories = {
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{"/Crypt", []() { return std::make_shared<SF_Crypt>(); }},
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{"/FlateDecode", SF_FlateLzwDecode::flate_factory},
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{"/LZWDecode", SF_FlateLzwDecode::lzw_factory},
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{"/RunLengthDecode", SF_RunLengthDecode::factory},
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{"/DCTDecode", SF_DCTDecode::factory},
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{"/ASCII85Decode", SF_ASCII85Decode::factory},
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{"/ASCIIHexDecode", SF_ASCIIHexDecode::factory},
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};
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QPDF_Stream::QPDF_Stream(QPDF* 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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qpdf(qpdf),
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objid(objid),
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generation(generation),
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filter_on_write(true),
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stream_dict(stream_dict),
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offset(offset),
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length(length)
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{
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if (! stream_dict.isDictionary())
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{
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throw std::logic_error(
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"stream object instantiated with non-dictionary "
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"object for dictionary");
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}
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setStreamDescription();
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}
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QPDF_Stream::~QPDF_Stream()
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{
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}
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void
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QPDF_Stream::registerStreamFilter(
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std::string const& filter_name,
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std::function<std::shared_ptr<QPDFStreamFilter>()> factory)
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{
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filter_factories[filter_name] = factory;
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}
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void
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QPDF_Stream::setFilterOnWrite(bool val)
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{
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this->filter_on_write = val;
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}
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bool
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QPDF_Stream::getFilterOnWrite() const
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{
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return this->filter_on_write;
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}
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void
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QPDF_Stream::releaseResolved()
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{
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this->stream_provider = 0;
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QPDFObjectHandle::ReleaseResolver::releaseResolved(this->stream_dict);
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}
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void
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QPDF_Stream::setObjGen(int objid, int generation)
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{
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if (! ((this->objid == 0) && (this->generation == 0)))
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{
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throw std::logic_error(
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"attempt to set object ID and generation of a stream"
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" that already has them");
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}
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this->objid = objid;
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this->generation = generation;
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}
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std::string
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QPDF_Stream::unparse()
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{
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// Unparse stream objects as indirect references
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return QUtil::int_to_string(this->objid) + " " +
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QUtil::int_to_string(this->generation) + " R";
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}
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JSON
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QPDF_Stream::getJSON()
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{
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return this->stream_dict.getJSON();
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}
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QPDFObject::object_type_e
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QPDF_Stream::getTypeCode() const
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{
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return QPDFObject::ot_stream;
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}
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char const*
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QPDF_Stream::getTypeName() const
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{
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return "stream";
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}
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void
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QPDF_Stream::setDescription(QPDF* qpdf, std::string const& description)
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{
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this->QPDFObject::setDescription(qpdf, description);
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setDictDescription();
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}
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void
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QPDF_Stream::setStreamDescription()
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{
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setDescription(
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this->qpdf,
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this->qpdf->getFilename() +
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", stream object " + QUtil::int_to_string(this->objid) + " " +
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QUtil::int_to_string(this->generation));
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}
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void
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QPDF_Stream::setDictDescription()
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{
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QPDF* qpdf = 0;
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std::string description;
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if ((! this->stream_dict.hasObjectDescription()) &&
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getDescription(qpdf, description))
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{
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this->stream_dict.setObjectDescription(
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qpdf, description + " -> stream dictionary");
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}
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}
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QPDFObjectHandle
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QPDF_Stream::getDict() const
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{
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return this->stream_dict;
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}
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bool
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QPDF_Stream::isDataModified() const
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{
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return (! this->token_filters.empty());
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}
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qpdf_offset_t
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QPDF_Stream::getOffset() const
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{
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return this->offset;
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}
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size_t
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QPDF_Stream::getLength() const
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{
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return this->length;
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}
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PointerHolder<Buffer>
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QPDF_Stream::getStreamDataBuffer() const
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{
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return this->stream_data;
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}
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PointerHolder<QPDFObjectHandle::StreamDataProvider>
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QPDF_Stream::getStreamDataProvider() const
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{
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return this->stream_provider;
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}
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PointerHolder<Buffer>
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QPDF_Stream::getStreamData(qpdf_stream_decode_level_e decode_level)
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{
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Pl_Buffer buf("stream data buffer");
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bool filtered;
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pipeStreamData(&buf, &filtered, 0, decode_level, false, false);
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if (! filtered)
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{
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throw QPDFExc(qpdf_e_unsupported, qpdf->getFilename(),
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"", this->offset,
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"getStreamData called on unfilterable stream");
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}
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QTC::TC("qpdf", "QPDF_Stream getStreamData");
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return buf.getBufferSharedPointer();
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}
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PointerHolder<Buffer>
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QPDF_Stream::getRawStreamData()
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{
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Pl_Buffer buf("stream data buffer");
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if (! pipeStreamData(&buf, nullptr, 0, qpdf_dl_none, false, false))
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{
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throw QPDFExc(qpdf_e_unsupported, qpdf->getFilename(),
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"", this->offset,
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"error getting raw stream data");
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}
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QTC::TC("qpdf", "QPDF_Stream getRawStreamData");
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return buf.getBufferSharedPointer();
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}
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bool
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QPDF_Stream::filterable(
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std::vector<std::shared_ptr<QPDFStreamFilter>>& filters,
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bool& specialized_compression,
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bool& lossy_compression)
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{
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// Check filters
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QPDFObjectHandle filter_obj = this->stream_dict.getKey("/Filter");
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bool filters_okay = true;
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std::vector<std::string> filter_names;
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if (filter_obj.isNull())
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{
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// No filters
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}
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else if (filter_obj.isName())
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{
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// One filter
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filter_names.push_back(filter_obj.getName());
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}
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else if (filter_obj.isArray())
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{
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// Potentially multiple filters
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int n = filter_obj.getArrayNItems();
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for (int i = 0; i < n; ++i)
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{
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QPDFObjectHandle item = filter_obj.getArrayItem(i);
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if (item.isName())
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{
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filter_names.push_back(item.getName());
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}
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else
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{
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filters_okay = false;
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}
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}
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}
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else
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{
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filters_okay = false;
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}
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if (! filters_okay)
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{
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QTC::TC("qpdf", "QPDF_Stream invalid filter");
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warn(QPDFExc(qpdf_e_damaged_pdf, qpdf->getFilename(),
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"", this->offset,
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"stream filter type is not name or array"));
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return false;
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}
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bool filterable = true;
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for (auto& filter_name: filter_names)
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{
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if (filter_abbreviations.count(filter_name))
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{
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QTC::TC("qpdf", "QPDF_Stream expand filter abbreviation");
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filter_name = filter_abbreviations[filter_name];
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}
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auto ff = filter_factories.find(filter_name);
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if (ff == filter_factories.end())
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{
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filterable = false;
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}
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else
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{
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filters.push_back((ff->second)());
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}
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}
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if (! filterable)
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{
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return false;
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}
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// filters now contains a list of filters to be applied in order.
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// See which ones we can support.
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// See if we can support any decode parameters that are specified.
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QPDFObjectHandle decode_obj = this->stream_dict.getKey("/DecodeParms");
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std::vector<QPDFObjectHandle> decode_parms;
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if (decode_obj.isArray() && (decode_obj.getArrayNItems() == 0))
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{
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decode_obj = QPDFObjectHandle::newNull();
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}
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if (decode_obj.isArray())
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{
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for (int i = 0; i < decode_obj.getArrayNItems(); ++i)
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{
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decode_parms.push_back(decode_obj.getArrayItem(i));
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}
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}
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else
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{
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for (unsigned int i = 0; i < filter_names.size(); ++i)
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{
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decode_parms.push_back(decode_obj);
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}
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}
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// Ignore /DecodeParms entirely if /Filters is empty. At least
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// one case of a file whose /DecodeParms was [ << >> ] when
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// /Filters was empty has been seen in the wild.
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if ((filters.size() != 0) && (decode_parms.size() != filters.size()))
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{
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warn(QPDFExc(qpdf_e_damaged_pdf, qpdf->getFilename(),
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"", this->offset,
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"stream /DecodeParms length is"
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" inconsistent with filters"));
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filterable = false;
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}
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if (! filterable)
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{
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return false;
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}
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for (size_t i = 0; i < filters.size(); ++i)
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{
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auto filter = filters.at(i);
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auto decode_item = decode_parms.at(i);
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if (filter->setDecodeParms(decode_item))
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{
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if (filter->isSpecializedCompression())
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{
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specialized_compression = true;
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}
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if (filter->isLossyCompression())
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{
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specialized_compression = true;
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lossy_compression = true;
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}
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}
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else
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{
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filterable = false;
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}
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}
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return filterable;
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}
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bool
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QPDF_Stream::pipeStreamData(Pipeline* pipeline, bool* filterp,
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int encode_flags,
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qpdf_stream_decode_level_e decode_level,
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bool suppress_warnings, bool will_retry)
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{
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std::vector<std::shared_ptr<QPDFStreamFilter>> filters;
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bool specialized_compression = false;
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bool lossy_compression = false;
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bool ignored;
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if (filterp == nullptr)
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{
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filterp = &ignored;
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}
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bool& filter = *filterp;
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filter = (! ((encode_flags == 0) && (decode_level == qpdf_dl_none)));
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bool success = true;
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if (filter)
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{
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filter = filterable(
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filters, specialized_compression, lossy_compression);
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if ((decode_level < qpdf_dl_all) && lossy_compression)
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{
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filter = false;
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}
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if ((decode_level < qpdf_dl_specialized) && specialized_compression)
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{
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filter = false;
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}
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QTC::TC("qpdf", "QPDF_Stream special filters",
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(! filter) ? 0 :
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lossy_compression ? 1 :
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specialized_compression ? 2 :
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3);
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}
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if (pipeline == 0)
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{
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QTC::TC("qpdf", "QPDF_Stream pipeStreamData with null pipeline");
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// Return value is whether we can filter in this case.
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return filter;
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}
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// Construct the pipeline in reverse order. Force pipelines we
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// create to be deleted when this function finishes. Pipelines
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// created by QPDFStreamFilter objects will be deleted by those
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// objects.
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std::vector<std::shared_ptr<Pipeline>> to_delete;
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PointerHolder<ContentNormalizer> normalizer;
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std::shared_ptr<Pipeline> new_pipeline;
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if (filter)
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{
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if (encode_flags & qpdf_ef_compress)
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{
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new_pipeline = std::make_shared<Pl_Flate>(
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"compress stream", pipeline, Pl_Flate::a_deflate);
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to_delete.push_back(new_pipeline);
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pipeline = new_pipeline.get();
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}
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if (encode_flags & qpdf_ef_normalize)
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{
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normalizer = make_pointer_holder<ContentNormalizer>();
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new_pipeline = std::make_shared<Pl_QPDFTokenizer>(
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"normalizer", normalizer.get(), pipeline);
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to_delete.push_back(new_pipeline);
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pipeline = new_pipeline.get();
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}
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for (auto iter = this->token_filters.rbegin();
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iter != this->token_filters.rend(); ++iter)
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{
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new_pipeline = std::make_shared<Pl_QPDFTokenizer>(
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"token filter", (*iter).get(), pipeline);
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to_delete.push_back(new_pipeline);
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pipeline = new_pipeline.get();
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}
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for (auto f_iter = filters.rbegin();
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f_iter != filters.rend(); ++f_iter)
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{
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auto decode_pipeline = (*f_iter)->getDecodePipeline(pipeline);
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if (decode_pipeline)
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{
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pipeline = decode_pipeline;
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}
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Pl_Flate* flate = dynamic_cast<Pl_Flate*>(pipeline);
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if (flate != nullptr)
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{
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flate->setWarnCallback([this](char const* msg, int code) {
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warn(QPDFExc(qpdf_e_damaged_pdf, qpdf->getFilename(),
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"", this->offset, msg));
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});
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}
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}
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}
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if (this->stream_data.get())
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{
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QTC::TC("qpdf", "QPDF_Stream pipe replaced stream data");
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pipeline->write(this->stream_data->getBuffer(),
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this->stream_data->getSize());
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pipeline->finish();
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}
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else if (this->stream_provider.get())
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{
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Pl_Count count("stream provider count", pipeline);
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if (this->stream_provider->supportsRetry())
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{
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if (! this->stream_provider->provideStreamData(
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this->objid, this->generation, &count,
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suppress_warnings, will_retry))
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{
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filter = false;
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success = false;
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}
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}
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else
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{
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this->stream_provider->provideStreamData(
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this->objid, this->generation, &count);
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}
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qpdf_offset_t actual_length = count.getCount();
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qpdf_offset_t desired_length = 0;
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if (success && this->stream_dict.hasKey("/Length"))
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{
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desired_length = this->stream_dict.getKey("/Length").getIntValue();
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if (actual_length == desired_length)
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{
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QTC::TC("qpdf", "QPDF_Stream pipe use stream provider");
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}
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else
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{
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QTC::TC("qpdf", "QPDF_Stream provider length mismatch");
|
|
// This would be caused by programmer error on the
|
|
// part of a library user, not by invalid input data.
|
|
throw std::runtime_error(
|
|
"stream data provider for " +
|
|
QUtil::int_to_string(this->objid) + " " +
|
|
QUtil::int_to_string(this->generation) +
|
|
" provided " +
|
|
QUtil::int_to_string(actual_length) +
|
|
" bytes instead of expected " +
|
|
QUtil::int_to_string(desired_length) + " bytes");
|
|
}
|
|
}
|
|
else if (success)
|
|
{
|
|
QTC::TC("qpdf", "QPDF_Stream provider length not provided");
|
|
this->stream_dict.replaceKey(
|
|
"/Length", QPDFObjectHandle::newInteger(actual_length));
|
|
}
|
|
}
|
|
else if (this->offset == 0)
|
|
{
|
|
QTC::TC("qpdf", "QPDF_Stream pipe no stream data");
|
|
throw std::logic_error(
|
|
"pipeStreamData called for stream with no data");
|
|
}
|
|
else
|
|
{
|
|
QTC::TC("qpdf", "QPDF_Stream pipe original stream data");
|
|
if (! QPDF::Pipe::pipeStreamData(this->qpdf, this->objid, this->generation,
|
|
this->offset, this->length,
|
|
this->stream_dict, pipeline,
|
|
suppress_warnings,
|
|
will_retry))
|
|
{
|
|
filter = false;
|
|
success = false;
|
|
}
|
|
}
|
|
|
|
if (filter &&
|
|
(! suppress_warnings) &&
|
|
normalizer.get() &&
|
|
normalizer->anyBadTokens())
|
|
{
|
|
warn(QPDFExc(qpdf_e_damaged_pdf, qpdf->getFilename(),
|
|
"", this->offset,
|
|
"content normalization encountered bad tokens"));
|
|
if (normalizer->lastTokenWasBad())
|
|
{
|
|
QTC::TC("qpdf", "QPDF_Stream bad token at end during normalize");
|
|
warn(QPDFExc(qpdf_e_damaged_pdf, qpdf->getFilename(),
|
|
"", this->offset,
|
|
"normalized content ended with a bad token;"
|
|
" you may be able to resolve this by"
|
|
" coalescing content streams in combination"
|
|
" with normalizing content. From the command"
|
|
" line, specify --coalesce-contents"));
|
|
}
|
|
warn(QPDFExc(qpdf_e_damaged_pdf, qpdf->getFilename(),
|
|
"", this->offset,
|
|
"Resulting stream data may be corrupted but is"
|
|
" may still useful for manual inspection."
|
|
" For more information on this warning, search"
|
|
" for content normalization in the manual."));
|
|
}
|
|
|
|
return success;
|
|
}
|
|
|
|
void
|
|
QPDF_Stream::replaceStreamData(PointerHolder<Buffer> data,
|
|
QPDFObjectHandle const& filter,
|
|
QPDFObjectHandle const& decode_parms)
|
|
{
|
|
this->stream_data = data;
|
|
this->stream_provider = 0;
|
|
replaceFilterData(filter, decode_parms, data->getSize());
|
|
}
|
|
|
|
void
|
|
QPDF_Stream::replaceStreamData(
|
|
PointerHolder<QPDFObjectHandle::StreamDataProvider> provider,
|
|
QPDFObjectHandle const& filter,
|
|
QPDFObjectHandle const& decode_parms)
|
|
{
|
|
this->stream_provider = provider;
|
|
this->stream_data = 0;
|
|
replaceFilterData(filter, decode_parms, 0);
|
|
}
|
|
|
|
void
|
|
QPDF_Stream::addTokenFilter(
|
|
PointerHolder<QPDFObjectHandle::TokenFilter> token_filter)
|
|
{
|
|
this->token_filters.push_back(token_filter);
|
|
}
|
|
|
|
void
|
|
QPDF_Stream::replaceFilterData(QPDFObjectHandle const& filter,
|
|
QPDFObjectHandle const& decode_parms,
|
|
size_t length)
|
|
{
|
|
this->stream_dict.replaceOrRemoveKey("/Filter", filter);
|
|
this->stream_dict.replaceOrRemoveKey("/DecodeParms", decode_parms);
|
|
if (length == 0)
|
|
{
|
|
QTC::TC("qpdf", "QPDF_Stream unknown stream length");
|
|
this->stream_dict.removeKey("/Length");
|
|
}
|
|
else
|
|
{
|
|
this->stream_dict.replaceKey(
|
|
"/Length", QPDFObjectHandle::newInteger(
|
|
QIntC::to_longlong(length)));
|
|
}
|
|
}
|
|
|
|
void
|
|
QPDF_Stream::replaceDict(QPDFObjectHandle new_dict)
|
|
{
|
|
this->stream_dict = new_dict;
|
|
setDictDescription();
|
|
QPDFObjectHandle length_obj = new_dict.getKey("/Length");
|
|
if (length_obj.isInteger())
|
|
{
|
|
this->length = QIntC::to_size(length_obj.getUIntValue());
|
|
}
|
|
else
|
|
{
|
|
this->length = 0;
|
|
}
|
|
}
|
|
|
|
void
|
|
QPDF_Stream::warn(QPDFExc const& e)
|
|
{
|
|
this->qpdf->warn(e);
|
|
}
|