mirror of
https://github.com/qpdf/qpdf.git
synced 2024-11-01 03:12:29 +00:00
83e0f8da88
1. Make class final 2. Pass og parameter by value 3. Properly initialize qpdf and og Also, tweak QPDF::replaceObject to allow stream replacement without violating the requirement that streams must always be indirect objects. Also, remove QPDF::reserveStream as it does not do what the name implies and having this as a separate methods does not aid code readability.
691 lines
21 KiB
C++
691 lines
21 KiB
C++
#include <qpdf/QPDF_Stream.hh>
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#include <qpdf/ContentNormalizer.hh>
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#include <qpdf/JSON_writer.hh>
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#include <qpdf/Pipeline.hh>
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#include <qpdf/Pl_Base64.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/Pl_Discard.hh>
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#include <qpdf/Pl_Flate.hh>
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#include <qpdf/Pl_QPDFTokenizer.hh>
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#include <qpdf/QIntC.hh>
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#include <qpdf/QPDF.hh>
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#include <qpdf/QPDFExc.hh>
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#include <qpdf/QTC.hh>
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#include <qpdf/QUtil.hh>
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#include <qpdf/SF_ASCII85Decode.hh>
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#include <qpdf/SF_ASCIIHexDecode.hh>
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#include <qpdf/SF_DCTDecode.hh>
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#include <qpdf/SF_FlateLzwDecode.hh>
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#include <qpdf/SF_RunLengthDecode.hh>
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#include <stdexcept>
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namespace
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{
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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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~SF_Crypt() override = default;
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bool
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setDecodeParms(QPDFObjectHandle decode_parms) override
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{
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if (decode_parms.isNull()) {
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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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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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// we handle this in decryptStream
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} else {
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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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Pipeline*
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getDecodePipeline(Pipeline*) override
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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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class StreamBlobProvider
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{
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public:
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StreamBlobProvider(QPDF_Stream* stream, qpdf_stream_decode_level_e decode_level);
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void operator()(Pipeline*);
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private:
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QPDF_Stream* stream;
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qpdf_stream_decode_level_e decode_level;
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};
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} // namespace
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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 use in inline images, but
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// according to table H.1 in the pre-ISO versions of the PDF specification, Adobe Reader also
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// accepts 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<std::string, 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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StreamBlobProvider::StreamBlobProvider(
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QPDF_Stream* stream, qpdf_stream_decode_level_e decode_level) :
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stream(stream),
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decode_level(decode_level)
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{
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}
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void
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StreamBlobProvider::operator()(Pipeline* p)
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{
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this->stream->pipeStreamData(p, nullptr, 0, decode_level, false, false);
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}
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QPDF_Stream::QPDF_Stream(
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QPDF* qpdf, QPDFObjGen og, QPDFObjectHandle stream_dict, qpdf_offset_t offset, size_t length) :
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QPDFValue(::ot_stream, qpdf, og),
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filter_on_write(true),
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stream_dict(stream_dict),
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length(length)
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{
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if (!stream_dict.isDictionary()) {
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throw std::logic_error(
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"stream object instantiated with non-dictionary object for dictionary");
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}
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auto descr = std::make_shared<QPDFValue::Description>(
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qpdf->getFilename() + ", stream object " + og.unparse(' '));
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setDescription(qpdf, descr, offset);
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}
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std::shared_ptr<QPDFObject>
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QPDF_Stream::create(
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QPDF* qpdf, QPDFObjGen og, QPDFObjectHandle stream_dict, qpdf_offset_t offset, size_t length)
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{
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return do_create(new QPDF_Stream(qpdf, og, stream_dict, offset, length));
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}
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std::shared_ptr<QPDFObject>
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QPDF_Stream::copy(bool shallow)
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{
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QTC::TC("qpdf", "QPDF_Stream ERR shallow copy stream");
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throw std::runtime_error("stream objects cannot be cloned");
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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, 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::disconnect()
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{
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this->stream_provider = nullptr;
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QPDFObjectHandle::DisconnectAccess::disconnect(this->stream_dict);
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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 og.unparse(' ') + " R";
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}
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void
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QPDF_Stream::writeJSON(int json_version, JSON::Writer& jw)
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{
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stream_dict.writeJSON(json_version, jw);
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}
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JSON
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QPDF_Stream::getStreamJSON(
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int json_version,
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qpdf_json_stream_data_e json_data,
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qpdf_stream_decode_level_e decode_level,
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Pipeline* p,
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std::string const& data_filename)
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{
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Pl_Buffer pb{"streamjson"};
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JSON::Writer jw{&pb, 0};
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decode_level =
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writeStreamJSON(json_version, jw, json_data, decode_level, p, data_filename, true);
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pb.finish();
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auto result = JSON::parse(pb.getString());
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if (json_data == qpdf_sj_inline) {
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result.addDictionaryMember("data", JSON::makeBlob(StreamBlobProvider(this, decode_level)));
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}
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return result;
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}
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qpdf_stream_decode_level_e
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QPDF_Stream::writeStreamJSON(
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int json_version,
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JSON::Writer& jw,
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qpdf_json_stream_data_e json_data,
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qpdf_stream_decode_level_e decode_level,
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Pipeline* p,
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std::string const& data_filename,
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bool no_data_key)
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{
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switch (json_data) {
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case qpdf_sj_none:
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case qpdf_sj_inline:
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if (p != nullptr) {
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throw std::logic_error("QPDF_Stream::writeStreamJSON: pipeline should only be supplied "
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"when json_data is file");
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}
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break;
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case qpdf_sj_file:
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if (p == nullptr) {
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throw std::logic_error(
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"QPDF_Stream::writeStreamJSON: pipeline must be supplied when json_data is file");
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}
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if (data_filename.empty()) {
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throw std::logic_error("QPDF_Stream::writeStreamJSON: data_filename must be supplied "
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"when json_data is file");
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}
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break;
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}
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jw.writeStart('{');
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if (json_data == qpdf_sj_none) {
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jw.writeNext();
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jw << R"("dict": )";
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stream_dict.writeJSON(json_version, jw);
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jw.writeEnd('}');
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return decode_level;
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}
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Pl_Discard discard;
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Pl_Buffer buf_pl{"stream data"};
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Pipeline* data_pipeline = &buf_pl;
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if (no_data_key && json_data == qpdf_sj_inline) {
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data_pipeline = &discard;
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}
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// pipeStreamData produced valid data.
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bool buf_pl_ready = false;
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bool filtered = false;
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bool filter = (decode_level != qpdf_dl_none);
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for (int attempt = 1; attempt <= 2; ++attempt) {
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bool succeeded =
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pipeStreamData(data_pipeline, &filtered, 0, decode_level, false, (attempt == 1));
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if (!succeeded || (filter && !filtered)) {
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// Try again
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filter = false;
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decode_level = qpdf_dl_none;
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buf_pl.getString(); // reset buf_pl
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} else {
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buf_pl_ready = true;
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break;
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}
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}
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if (!buf_pl_ready) {
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throw std::logic_error("QPDF_Stream: failed to get stream data");
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}
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// We can use unsafeShallowCopy because we are only touching top-level keys.
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auto dict = stream_dict.unsafeShallowCopy();
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dict.removeKey("/Length");
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if (filter && filtered) {
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dict.removeKey("/Filter");
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dict.removeKey("/DecodeParms");
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}
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if (json_data == qpdf_sj_file) {
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jw.writeNext() << R"("datafile": ")" << JSON::Writer::encode_string(data_filename) << "\"";
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p->writeString(buf_pl.getString());
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} else if (json_data == qpdf_sj_inline) {
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if (!no_data_key) {
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jw.writeNext() << R"("data": ")";
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jw.writeBase64(buf_pl.getString()) << "\"";
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}
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} else {
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throw std::logic_error("QPDF_Stream::writeStreamJSON : unexpected value of json_data");
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}
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jw.writeNext() << R"("dict": )";
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dict.writeJSON(json_version, jw);
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jw.writeEnd('}');
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return decode_level;
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}
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void
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QPDF_Stream::setDescription(
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QPDF* qpdf, std::shared_ptr<QPDFValue::Description>& description, qpdf_offset_t offset)
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{
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this->QPDFValue::setDescription(qpdf, description, offset);
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setDictDescription();
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}
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void
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QPDF_Stream::setDictDescription()
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{
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if (!this->stream_dict.hasObjectDescription()) {
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this->stream_dict.setObjectDescription(qpdf, getDescription() + " -> 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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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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std::shared_ptr<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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std::shared_ptr<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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std::shared_ptr<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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throw QPDFExc(
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qpdf_e_unsupported,
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qpdf->getFilename(),
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"",
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this->parsed_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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std::shared_ptr<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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throw QPDFExc(
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qpdf_e_unsupported,
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qpdf->getFilename(),
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"",
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this->parsed_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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// No filters
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} else if (filter_obj.isName()) {
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// One filter
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filter_names.push_back(filter_obj.getName());
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} else if (filter_obj.isArray()) {
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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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QPDFObjectHandle item = filter_obj.getArrayItem(i);
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if (item.isName()) {
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filter_names.push_back(item.getName());
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} else {
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filters_okay = false;
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}
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}
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} else {
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filters_okay = false;
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}
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if (!filters_okay) {
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QTC::TC("qpdf", "QPDF_Stream invalid filter");
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warn("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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if (filter_abbreviations.count(filter_name)) {
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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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filterable = false;
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} else {
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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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return false;
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}
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// filters now contains a list of filters to be applied in order. 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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decode_obj = QPDFObjectHandle::newNull();
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}
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if (decode_obj.isArray()) {
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for (int i = 0; i < decode_obj.getArrayNItems(); ++i) {
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decode_parms.push_back(decode_obj.getArrayItem(i));
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}
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} else {
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for (unsigned int i = 0; i < filter_names.size(); ++i) {
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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 one case of a file whose
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// /DecodeParms was [ << >> ] when /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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warn("stream /DecodeParms length is inconsistent with filters");
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filterable = false;
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}
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if (!filterable) {
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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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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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if (filter->isSpecializedCompression()) {
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specialized_compression = true;
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}
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if (filter->isLossyCompression()) {
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specialized_compression = true;
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lossy_compression = true;
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}
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} else {
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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(
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Pipeline* pipeline,
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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,
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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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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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filter = filterable(filters, specialized_compression, lossy_compression);
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if ((decode_level < qpdf_dl_all) && lossy_compression) {
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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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filter = false;
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}
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QTC::TC(
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"qpdf",
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"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 == nullptr) {
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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 create to be deleted when this
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// function finishes. Pipelines 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;
|
|
|
|
std::shared_ptr<ContentNormalizer> normalizer;
|
|
std::shared_ptr<Pipeline> new_pipeline;
|
|
if (filter) {
|
|
if (encode_flags & qpdf_ef_compress) {
|
|
new_pipeline =
|
|
std::make_shared<Pl_Flate>("compress stream", pipeline, Pl_Flate::a_deflate);
|
|
to_delete.push_back(new_pipeline);
|
|
pipeline = new_pipeline.get();
|
|
}
|
|
|
|
if (encode_flags & qpdf_ef_normalize) {
|
|
normalizer = std::make_shared<ContentNormalizer>();
|
|
new_pipeline =
|
|
std::make_shared<Pl_QPDFTokenizer>("normalizer", normalizer.get(), pipeline);
|
|
to_delete.push_back(new_pipeline);
|
|
pipeline = new_pipeline.get();
|
|
}
|
|
|
|
for (auto iter = this->token_filters.rbegin(); iter != this->token_filters.rend(); ++iter) {
|
|
new_pipeline =
|
|
std::make_shared<Pl_QPDFTokenizer>("token filter", (*iter).get(), pipeline);
|
|
to_delete.push_back(new_pipeline);
|
|
pipeline = new_pipeline.get();
|
|
}
|
|
|
|
for (auto f_iter = filters.rbegin(); f_iter != filters.rend(); ++f_iter) {
|
|
auto decode_pipeline = (*f_iter)->getDecodePipeline(pipeline);
|
|
if (decode_pipeline) {
|
|
pipeline = decode_pipeline;
|
|
}
|
|
auto* flate = dynamic_cast<Pl_Flate*>(pipeline);
|
|
if (flate != nullptr) {
|
|
flate->setWarnCallback([this](char const* msg, int code) { warn(msg); });
|
|
}
|
|
}
|
|
}
|
|
|
|
if (this->stream_data.get()) {
|
|
QTC::TC("qpdf", "QPDF_Stream pipe replaced stream data");
|
|
pipeline->write(this->stream_data->getBuffer(), this->stream_data->getSize());
|
|
pipeline->finish();
|
|
} else if (this->stream_provider.get()) {
|
|
Pl_Count count("stream provider count", pipeline);
|
|
if (this->stream_provider->supportsRetry()) {
|
|
if (!this->stream_provider->provideStreamData(
|
|
og, &count, suppress_warnings, will_retry)) {
|
|
filter = false;
|
|
success = false;
|
|
}
|
|
} else {
|
|
this->stream_provider->provideStreamData(og, &count);
|
|
}
|
|
qpdf_offset_t actual_length = count.getCount();
|
|
qpdf_offset_t desired_length = 0;
|
|
if (success && this->stream_dict.hasKey("/Length")) {
|
|
desired_length = this->stream_dict.getKey("/Length").getIntValue();
|
|
if (actual_length == desired_length) {
|
|
QTC::TC("qpdf", "QPDF_Stream pipe use stream provider");
|
|
} else {
|
|
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 " + og.unparse(' ') + " provided " +
|
|
std::to_string(actual_length) + " bytes instead of expected " +
|
|
std::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->parsed_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,
|
|
og,
|
|
this->parsed_offset,
|
|
this->length,
|
|
this->stream_dict,
|
|
pipeline,
|
|
suppress_warnings,
|
|
will_retry)) {
|
|
filter = false;
|
|
success = false;
|
|
}
|
|
}
|
|
|
|
if (filter && (!suppress_warnings) && normalizer.get() && normalizer->anyBadTokens()) {
|
|
warn("content normalization encountered bad tokens");
|
|
if (normalizer->lastTokenWasBad()) {
|
|
QTC::TC("qpdf", "QPDF_Stream bad token at end during normalize");
|
|
warn("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("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(
|
|
std::shared_ptr<Buffer> data,
|
|
QPDFObjectHandle const& filter,
|
|
QPDFObjectHandle const& decode_parms)
|
|
{
|
|
this->stream_data = data;
|
|
this->stream_provider = nullptr;
|
|
replaceFilterData(filter, decode_parms, data->getSize());
|
|
}
|
|
|
|
void
|
|
QPDF_Stream::replaceStreamData(
|
|
std::shared_ptr<QPDFObjectHandle::StreamDataProvider> provider,
|
|
QPDFObjectHandle const& filter,
|
|
QPDFObjectHandle const& decode_parms)
|
|
{
|
|
this->stream_provider = provider;
|
|
this->stream_data = nullptr;
|
|
replaceFilterData(filter, decode_parms, 0);
|
|
}
|
|
|
|
void
|
|
QPDF_Stream::addTokenFilter(std::shared_ptr<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)
|
|
{
|
|
if (filter.isInitialized()) {
|
|
this->stream_dict.replaceKey("/Filter", filter);
|
|
}
|
|
if (decode_parms.isInitialized()) {
|
|
this->stream_dict.replaceKey("/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 const& new_dict)
|
|
{
|
|
this->stream_dict = new_dict;
|
|
setDictDescription();
|
|
}
|
|
|
|
void
|
|
QPDF_Stream::warn(std::string const& message)
|
|
{
|
|
this->qpdf->warn(qpdf_e_damaged_pdf, "", this->parsed_offset, message);
|
|
}
|