OpenSystemsDevelopment / qpdf

Commit 7b6ab900dced033465172976abeb3497454a1a7a

Authored by Jay Berkenbilt
1 parent 16fd6e64

Support page collation with --collate (fixes #259)

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Showing 6 changed files with 1049 additions and 0 deletions
ChangeLog
  View file @7b6ab90
1 1 2019-01-04 Jay Berkenbilt <ejb@ql.org>
2 2  
  3 + * Add new option --collate. When specified, the semantics of
  4 + --pages change from concatenation to collation. See the manual for
  5 + a more detailed discussion. Fixes #259.
  6 +
3 7 * Add new method QPDFWriter::getFinalVersion, which returns the
4 8 PDF version that will ultimately be written to the final file. See
5 9 comments in QPDFWriter.hh for some restrictions on its use. Fixes
... ...
qpdf/qpdf.cc
  View file @7b6ab90
... ... @@ -124,6 +124,7 @@ struct Options
124 124 show_filtered_stream_data(false),
125 125 show_pages(false),
126 126 show_page_images(false),
  127 + collate(false),
127 128 json(false),
128 129 check(false),
129 130 require_outfile(true),
... ... @@ -202,6 +203,7 @@ struct Options
202 203 bool show_filtered_stream_data;
203 204 bool show_pages;
204 205 bool show_page_images;
  206 + bool collate;
205 207 bool json;
206 208 std::set<std::string> json_keys;
207 209 std::set<std::string> json_objects;
... ... @@ -216,6 +218,7 @@ struct Options
216 218 struct QPDFPageData
217 219 {
218 220 QPDFPageData(std::string const& filename, QPDF* qpdf, char const* range);
  221 + QPDFPageData(QPDFPageData const& other, int page);
219 222  
220 223 std::string filename;
221 224 QPDF* qpdf;
... ... @@ -557,6 +560,7 @@ class ArgParser
557 560 void argEncryptionFilePassword(char* parameter);
558 561 void argPages();
559 562 void argRotate(char* parameter);
  563 + void argCollate();
560 564 void argStreamData(char* parameter);
561 565 void argCompressStreams(char* parameter);
562 566 void argDecodeLevel(char* parameter);
... ... @@ -743,6 +747,7 @@ ArgParser::initOptionTable()
743 747 &ArgParser::argRotate, "[+|-]angle:page-range");
744 748 char const* stream_data_choices[] =
745 749 {"compress", "preserve", "uncompress", 0};
  750 + (*t)["collate"] = oe_bare(&ArgParser::argCollate);
746 751 (*t)["stream-data"] = oe_requiredChoices(
747 752 &ArgParser::argStreamData, stream_data_choices);
748 753 (*t)["compress-streams"] = oe_requiredChoices(
... ... @@ -1063,6 +1068,12 @@ ArgParser::argEncryptionFilePassword(char* parameter)
1063 1068 }
1064 1069  
1065 1070 void
  1071 +ArgParser::argCollate()
  1072 +{
  1073 + o.collate = true;
  1074 +}
  1075 +
  1076 +void
1066 1077 ArgParser::argPages()
1067 1078 {
1068 1079 ++cur_arg;
... ... @@ -1711,6 +1722,8 @@ Basic Options\n\
1711 1722 --decrypt remove any encryption on the file\n\
1712 1723 --password-is-hex-key treat primary password option as a hex-encoded key\n\
1713 1724 --pages options -- select specific pages from one or more files\n\
  1725 +--collate causes files specified in --pages to be collated\n\
  1726 + rather than concatenated\n\
1714 1727 --rotate=[+|-]angle[:page-range]\n\
1715 1728 rotate each specified page 90, 180, or 270 degrees;\n\
1716 1729 rotate all pages if no page range is given\n\
... ... @@ -1854,6 +1867,14 @@ If the page range is omitted, the range of 1-z is assumed. qpdf decides\n\
1854 1867 that the page range is omitted if the range argument is either -- or a\n\
1855 1868 valid file name and not a valid range.\n\
1856 1869 \n\
  1870 +The usual behavior of --pages is to add all pages from the first file,\n\
  1871 +then all pages from the second file, and so on. If the --collate option\n\
  1872 +is specified, then pages are collated instead. In other words, qpdf takes\n\
  1873 +the first page from the first file, the first page from the second file,\n\
  1874 +and so on until it runs out of files; then it takes the second page from\n\
  1875 +each file, etc. When a file runs out of pages, it is skipped until all\n\
  1876 +specified pages are taken from all files.\n\
  1877 +\n\
1857 1878 See the manual for examples and a discussion of additional subtleties.\n\
1858 1879 \n\
1859 1880 \n\
... ... @@ -2225,6 +2246,14 @@ QPDFPageData::QPDFPageData(std::string const&amp; filename,
2225 2246 }
2226 2247 }
2227 2248  
  2249 +QPDFPageData::QPDFPageData(QPDFPageData const& other, int page) :
  2250 + filename(other.filename),
  2251 + qpdf(other.qpdf),
  2252 + orig_pages(other.orig_pages)
  2253 +{
  2254 + this->selected_pages.push_back(page);
  2255 +}
  2256 +
2228 2257 static void parse_version(std::string const& full_version_string,
2229 2258 std::string& version, int& extension_level)
2230 2259 {
... ... @@ -3553,6 +3582,35 @@ static void handle_page_specs(QPDF&amp; pdf, Options&amp; o,
3553 3582 dh.removePage(*iter);
3554 3583 }
3555 3584  
  3585 + if (o.collate && (parsed_specs.size() > 1))
  3586 + {
  3587 + // Collate the pages by selecting one page from each spec in
  3588 + // order. When a spec runs out of pages, stop selecting from
  3589 + // it.
  3590 + std::vector<QPDFPageData> new_parsed_specs;
  3591 + size_t nspecs = parsed_specs.size();
  3592 + size_t cur_page = 0;
  3593 + bool got_pages = true;
  3594 + while (got_pages)
  3595 + {
  3596 + got_pages = false;
  3597 + for (size_t i = 0; i < nspecs; ++i)
  3598 + {
  3599 + QPDFPageData& page_data = parsed_specs.at(i);
  3600 + if (cur_page < page_data.selected_pages.size())
  3601 + {
  3602 + got_pages = true;
  3603 + new_parsed_specs.push_back(
  3604 + QPDFPageData(
  3605 + page_data,
  3606 + page_data.selected_pages.at(cur_page)));
  3607 + }
  3608 + }
  3609 + ++cur_page;
  3610 + }
  3611 + parsed_specs = new_parsed_specs;
  3612 + }
  3613 +
3556 3614 // Add all the pages from all the files in the order specified.
3557 3615 // Keep track of any pages from the original file that we are
3558 3616 // selecting.
... ...
qpdf/qtest/qpdf.test
  View file @7b6ab90
... ... @@ -1739,6 +1739,28 @@ $td-&gt;runtest(&quot;check output&quot;,
1739 1739  
1740 1740 show_ntests();
1741 1741 # ----------
  1742 +$td->notify("--- Collating ---");
  1743 +my @collate = (
  1744 + ["three-files", "collate-odd",
  1745 + "collate-odd.pdf 1-5 minimal.pdf collate-even.pdf 7-1"],
  1746 + );
  1747 +$n_tests += 2 * scalar(@collate);
  1748 +
  1749 +foreach my $d (@collate)
  1750 +{
  1751 + my ($description, $first, $args) = @$d;
  1752 + $td->runtest("collate pages: $description",
  1753 + {$td->COMMAND =>
  1754 + "qpdf --qdf --static-id --collate $first.pdf" .
  1755 + " --pages $args -- a.pdf"},
  1756 + {$td->STRING => "", $td->EXIT_STATUS => 0});
  1757 + $td->runtest("check output",
  1758 + {$td->FILE => "a.pdf"},
  1759 + {$td->FILE => "$description-collate-out.pdf"});
  1760 +}
  1761 +
  1762 +show_ntests();
  1763 +# ----------
1742 1764 $td->notify("--- PDF From Scratch ---");
1743 1765 $n_tests += 2;
1744 1766  
... ...
qpdf/qtest/qpdf/collate-even.pdf 0 → 100644
View file @7b6ab90
No preview for this file type
qpdf/qtest/qpdf/collate-odd.pdf 0 → 100644
View file @7b6ab90
No preview for this file type
qpdf/qtest/qpdf/three-files-collate-out.pdf 0 → 100644
  View file @7b6ab90
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