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Code Issues Releases Wiki Activity

Support TIFF Predictor (fixes #171)

This commit is contained in:
Jay Berkenbilt 2018-01-13 14:24:09 -05:00
parent 53971d50be
commit ec0087e3ce
6 changed files with 38 additions and 9 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2018-01-13 Jay Berkenbilt <ejb@ql.org>
* Add support for TIFF predictor for LZW and Flate streams. Now
all predictor functions are supported.
2017-12-25 Jay Berkenbilt <ejb@ql.org>
* Clarify documentation around options that control parsing but

27
libqpdf/QPDF_Stream.cc
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@ -4,6 +4,7 @@
#include <qpdf/Pipeline.hh>
#include <qpdf/Pl_Flate.hh>
#include <qpdf/Pl_PNGFilter.hh>
#include <qpdf/Pl_TIFFPredictor.hh>
#include <qpdf/Pl_RC4.hh>
#include <qpdf/Pl_Buffer.hh>
#include <qpdf/Pl_ASCII85Decoder.hh>
@ -133,7 +134,7 @@ QPDF_Stream::understandDecodeParams(
if (predictor_obj.isInteger())
{
predictor = predictor_obj.getIntValue();
if (! ((predictor == 1) ||
if (! ((predictor == 1) || (predictor == 2) ||
((predictor >= 10) && (predictor <= 15))))
{
filterable = false;
@ -459,14 +460,24 @@ QPDF_Stream::pipeStreamData(Pipeline* pipeline,
{
std::string const& filter = *iter;
if (((filter == "/FlateDecode") || (filter == "/LZWDecode")) &&
((predictor >= 10) && (predictor <= 15)))
if ((filter == "/FlateDecode") || (filter == "/LZWDecode"))
{
QTC::TC("qpdf", "QPDF_Stream PNG filter");
pipeline = new Pl_PNGFilter(
"png decode", pipeline, Pl_PNGFilter::a_decode,
columns, colors, bits_per_component);
to_delete.push_back(pipeline);
if ((predictor >= 10) && (predictor <= 15))
{
QTC::TC("qpdf", "QPDF_Stream PNG filter");
pipeline = new Pl_PNGFilter(
"png decode", pipeline, Pl_PNGFilter::a_decode,
columns, colors, bits_per_component);
to_delete.push_back(pipeline);
}
else if (predictor == 2)
{
QTC::TC("qpdf", "QPDF_Stream TIFF predictor");
pipeline = new Pl_TIFFPredictor(
"tiff decode", pipeline, Pl_TIFFPredictor::a_decode,
columns, colors, bits_per_component);
to_delete.push_back(pipeline);
}
}
if (filter == "/Crypt")

1
qpdf/qpdf.testcov
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@ -301,3 +301,4 @@ qpdf-c called qpdf_set_decode_level 0
qpdf-c called qpdf_set_compress_streams 0
qpdf-c called qpdf_set_preserve_unreferenced_objects 0
qpdf-c called qpdf_set_newline_before_endstream 0
QPDF_Stream TIFF predictor 0

8
qpdf/qtest/qpdf.test
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@ -240,7 +240,7 @@ foreach my $d (@bug_tests)
show_ntests();
# ----------
$td->notify("--- Miscellaneous Tests ---");
$n_tests += 86;
$n_tests += 87;
$td->runtest("qpdf version",
{$td->COMMAND => "qpdf --version"},
@ -684,6 +684,12 @@ $td->runtest("short /O or /U",
$td->EXIT_STATUS => 0},
$td->NORMALIZE_NEWLINES);
$td->runtest("stream with tiff predictor",
{$td->COMMAND => "qpdf --check tiff-predictor.pdf"},
{$td->FILE => "tiff-predictor.out",
$td->EXIT_STATUS => 0},
$td->NORMALIZE_NEWLINES);
show_ntests();
# ----------
$td->notify("--- Newline before endstream ---");

6
qpdf/qtest/qpdf/tiff-predictor.out Normal file
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@ -0,0 +1,6 @@
checking tiff-predictor.pdf
PDF Version: 1.5
File is not encrypted
File is not linearized
No syntax or stream encoding errors found; the file may still contain
errors that qpdf cannot detect

BIN
qpdf/qtest/qpdf/tiff-predictor.pdf Normal file
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Binary file not shown.