SF_FlateLzwDecode.cc
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#include <qpdf/SF_FlateLzwDecode.hh>
#include <qpdf/Pl_Flate.hh>
#include <qpdf/Pl_LZWDecoder.hh>
#include <qpdf/Pl_PNGFilter.hh>
#include <qpdf/Pl_TIFFPredictor.hh>
#include <qpdf/QIntC.hh>
#include <qpdf/QTC.hh>
bool
SF_FlateLzwDecode::setDecodeParms(QPDFObjectHandle decode_parms)
{
if (decode_parms.isNull()) {
return true;
}
auto memory_limit = Pl_Flate::memory_limit();
std::set<std::string> keys = decode_parms.getKeys();
for (auto const& key: keys) {
QPDFObjectHandle value = decode_parms.getKey(key);
if (key == "/Predictor") {
if (value.isInteger()) {
predictor = value.getIntValueAsInt();
if (!(predictor == 1 || predictor == 2 || (predictor >= 10 && predictor <= 15))) {
return false;
}
} else {
return false;
}
} else if (key == "/Columns" || key == "/Colors" || key == "/BitsPerComponent") {
if (value.isInteger()) {
int val = value.getIntValueAsInt();
if (memory_limit && static_cast<unsigned int>(val) > memory_limit) {
QPDFLogger::defaultLogger()->warn(
"SF_FlateLzwDecode parameter exceeds PL_Flate memory limit\n");
return false;
}
if (key == "/Columns") {
columns = val;
} else if (key == "/Colors") {
colors = val;
} else if (key == "/BitsPerComponent") {
bits_per_component = val;
}
} else {
return false;
}
} else if (lzw && (key == "/EarlyChange")) {
if (value.isInteger()) {
int earlychange = value.getIntValueAsInt();
early_code_change = (earlychange == 1);
if (!(earlychange == 0 || earlychange == 1)) {
return false;
}
} else {
return false;
}
}
}
if (predictor > 1 && columns == 0) {
return false;
}
return true;
}
Pipeline*
SF_FlateLzwDecode::getDecodePipeline(Pipeline* next)
{
std::shared_ptr<Pipeline> pipeline;
if (predictor >= 10 && predictor <= 15) {
QTC::TC("qpdf", "SF_FlateLzwDecode PNG filter");
pipeline = std::make_shared<Pl_PNGFilter>(
"png decode",
next,
Pl_PNGFilter::a_decode,
QIntC::to_uint(columns),
QIntC::to_uint(colors),
QIntC::to_uint(bits_per_component));
pipelines.push_back(pipeline);
next = pipeline.get();
} else if (predictor == 2) {
QTC::TC("qpdf", "SF_FlateLzwDecode TIFF predictor");
pipeline = std::make_shared<Pl_TIFFPredictor>(
"tiff decode",
next,
Pl_TIFFPredictor::a_decode,
QIntC::to_uint(columns),
QIntC::to_uint(colors),
QIntC::to_uint(bits_per_component));
pipelines.push_back(pipeline);
next = pipeline.get();
}
if (lzw) {
pipeline = std::make_shared<Pl_LZWDecoder>("lzw decode", next, early_code_change);
} else {
pipeline = std::make_shared<Pl_Flate>("stream inflate", next, Pl_Flate::a_inflate);
}
pipelines.push_back(pipeline);
return pipeline.get();
}
std::shared_ptr<QPDFStreamFilter>
SF_FlateLzwDecode::flate_factory()
{
return std::make_shared<SF_FlateLzwDecode>(false);
}
std::shared_ptr<QPDFStreamFilter>
SF_FlateLzwDecode::lzw_factory()
{
return std::make_shared<SF_FlateLzwDecode>(true);
}