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Code Issues Releases Wiki Activity

Preserve page labels (numbers) when splitting and merging

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This commit is contained in:
Jay Berkenbilt 2018-12-18 14:59:14 -05:00
parent 6ef9e31233
commit 352ce9b22b
12 changed files with 806 additions and 144 deletions
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6
ChangeLog
View File

@ -1,5 +1,11 @@
2018-12-18 Jay Berkenbilt <ejb@ql.org> 2018-12-18 Jay Berkenbilt <ejb@ql.org>
* Preserve page labels when merging and splitting files. Prior
versions of qpdf simply preserved the page label information from
the first file, which usually wouldn't make any sense in the
merged file. Now any page that had a page number in any original
file will have the same page number after merging or splitting.
* Add QPDFPageLabelDocumentHelper class. This is a document helper * Add QPDFPageLabelDocumentHelper class. This is a document helper
class that provides useful methods for dealing with page labels. class that provides useful methods for dealing with page labels.
It abstracts the fact that they are stored as number trees and It abstracts the fact that they are stored as number trees and

38
manual/qpdf-manual.xml
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@ -911,23 +911,23 @@ make
</itemizedlist> </itemizedlist>
</para> </para>
<para> <para>
Note that qpdf doesn't presently do anything special about other Starting in qpdf version 8.3, when you split and merge files, any
constructs in a PDF file that may know about pages, so semantics page labels (page numbers) are preserved in the final file. It is
of splitting and merging vary across features. For example, the expected that more document features will be preserved by
document's outlines (bookmarks) point to actual page objects, so splitting and merging. In the mean time, semantics of splitting
if you select some pages and not others, bookmarks that point to and merging vary across features. For example, the document's
pages that are in the output file will work, and remaining outlines (bookmarks) point to actual page objects, so if you
bookmarks will not work. On the other hand, page labels (page select some pages and not others, bookmarks that point to pages
numbers specified in the file) are just sequential, so page labels that are in the output file will work, and remaining bookmarks
will be messed up in the output file. A future version of will not work. A future version of <command>qpdf</command> may do
<command>qpdf</command> may do a better job at handling these a better job at handling these issues. (Note that the qpdf library
issues. (Note that the qpdf library already contains all of the already contains all of the APIs required in order to implement
APIs required in order to implement this in your own application this in your own application if you need it.) In the mean time,
if you need it.) In the mean time, you can always use you can always use <option>--empty</option> as the primary input
<option>--empty</option> as the primary input file to avoid file to avoid copying all of that from the first file. For
copying all of that from the first file. For example, to take example, to take pages 1 through 5 from a
pages 1 through 5 from a <filename>infile.pdf</filename> while <filename>infile.pdf</filename> while preserving all metadata
preserving all metadata associated with that file, you could use associated with that file, you could use
<programlisting><command>qpdf</command> <option>infile.pdf --pages infile.pdf 1-5 -- outfile.pdf</option> <programlisting><command>qpdf</command> <option>infile.pdf --pages infile.pdf 1-5 -- outfile.pdf</option>
</programlisting> </programlisting>
@ -946,8 +946,8 @@ make
If, for some reason, you wanted to take the first page of an If, for some reason, you wanted to take the first page of an
encrypted file called <filename>encrypted.pdf</filename> with encrypted file called <filename>encrypted.pdf</filename> with
password <literal>pass</literal> and repeat it twice in an output password <literal>pass</literal> and repeat it twice in an output
file, and if you wanted to drop metadata (like page numbers and file, and if you wanted to drop document-level metadata but
outlines) but preserve encryption, you would use preserve encryption, you would use
<programlisting><command>qpdf</command> <option>--empty --copy-encryption=encrypted.pdf --encryption-file-password=pass <programlisting><command>qpdf</command> <option>--empty --copy-encryption=encrypted.pdf --encryption-file-password=pass
--pages encrypted.pdf --password=pass 1 ./encrypted.pdf --password=pass 1 -- --pages encrypted.pdf --password=pass 1 ./encrypted.pdf --password=pass 1 --

52
qpdf/qpdf.cc
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@ -16,6 +16,7 @@
#include <qpdf/QPDF.hh> #include <qpdf/QPDF.hh>
#include <qpdf/QPDFPageDocumentHelper.hh> #include <qpdf/QPDFPageDocumentHelper.hh>
#include <qpdf/QPDFPageObjectHelper.hh> #include <qpdf/QPDFPageObjectHelper.hh>
#include <qpdf/QPDFPageLabelDocumentHelper.hh>
#include <qpdf/QPDFExc.hh> #include <qpdf/QPDFExc.hh>
#include <qpdf/QPDFWriter.hh> #include <qpdf/QPDFWriter.hh>
@ -2296,11 +2297,25 @@ static void handle_page_specs(QPDF& pdf, Options& o,
// Keep track of any pages from the original file that we are // Keep track of any pages from the original file that we are
// selecting. // selecting.
std::set<int> selected_from_orig; std::set<int> selected_from_orig;
std::vector<QPDFObjectHandle> new_labels;
bool any_page_labels = false;
int out_pageno = 0;
for (std::vector<QPDFPageData>::iterator iter = for (std::vector<QPDFPageData>::iterator iter =
parsed_specs.begin(); parsed_specs.begin();
iter != parsed_specs.end(); ++iter) iter != parsed_specs.end(); ++iter)
{ {
QPDFPageData& page_data = *iter; QPDFPageData& page_data = *iter;
ClosedFileInputSource* cis = 0;
if (page_spec_cfis.count(page_data.filename))
{
cis = page_spec_cfis[page_data.filename];
cis->stayOpen(true);
}
QPDFPageLabelDocumentHelper pldh(*page_data.qpdf);
if (pldh.hasPageLabels())
{
any_page_labels = true;
}
if (o.verbose) if (o.verbose)
{ {
std::cout << whoami << ": adding pages from " std::cout << whoami << ": adding pages from "
@ -2309,22 +2324,14 @@ static void handle_page_specs(QPDF& pdf, Options& o,
for (std::vector<int>::iterator pageno_iter = for (std::vector<int>::iterator pageno_iter =
page_data.selected_pages.begin(); page_data.selected_pages.begin();
pageno_iter != page_data.selected_pages.end(); pageno_iter != page_data.selected_pages.end();
++pageno_iter) ++pageno_iter, ++out_pageno)
{ {
// Pages are specified from 1 but numbered from 0 in the // Pages are specified from 1 but numbered from 0 in the
// vector // vector
int pageno = *pageno_iter - 1; int pageno = *pageno_iter - 1;
ClosedFileInputSource* cis = 0; pldh.getLabelsForPageRange(pageno, pageno, out_pageno,
if (page_spec_cfis.count(page_data.filename)) new_labels);
{
cis = page_spec_cfis[page_data.filename];
cis->stayOpen(true);
}
dh.addPage(page_data.orig_pages.at(pageno), false); dh.addPage(page_data.orig_pages.at(pageno), false);
if (cis)
{
cis->stayOpen(false);
}
if (page_data.qpdf == &pdf) if (page_data.qpdf == &pdf)
{ {
// This is a page from the original file. Keep track // This is a page from the original file. Keep track
@ -2332,6 +2339,18 @@ static void handle_page_specs(QPDF& pdf, Options& o,
selected_from_orig.insert(pageno); selected_from_orig.insert(pageno);
} }
} }
if (cis)
{
cis->stayOpen(false);
}
}
if (any_page_labels)
{
QPDFObjectHandle page_labels =
QPDFObjectHandle::newDictionary();
page_labels.replaceKey(
"/Nums", QPDFObjectHandle::newArray(new_labels));
pdf.getRoot().replaceKey("/PageLabels", page_labels);
} }
// Delete page objects for unused page in primary. This prevents // Delete page objects for unused page in primary. This prevents
@ -2574,6 +2593,7 @@ static void write_outfile(QPDF& pdf, Options& o)
dh.pushInheritedAttributesToPage(); dh.pushInheritedAttributesToPage();
dh.removeUnreferencedResources(); dh.removeUnreferencedResources();
} }
QPDFPageLabelDocumentHelper pldh(pdf);
std::vector<QPDFObjectHandle> const& pages = pdf.getAllPages(); std::vector<QPDFObjectHandle> const& pages = pdf.getAllPages();
int pageno_len = QUtil::int_to_string(pages.size()).length(); int pageno_len = QUtil::int_to_string(pages.size()).length();
unsigned int num_pages = pages.size(); unsigned int num_pages = pages.size();
@ -2592,6 +2612,16 @@ static void write_outfile(QPDF& pdf, Options& o)
QPDFObjectHandle page = pages.at(pageno - 1); QPDFObjectHandle page = pages.at(pageno - 1);
outpdf.addPage(page, false); outpdf.addPage(page, false);
} }
if (pldh.hasPageLabels())
{
std::vector<QPDFObjectHandle> labels;
pldh.getLabelsForPageRange(first - 1, last - 1, 0, labels);
QPDFObjectHandle page_labels =
QPDFObjectHandle::newDictionary();
page_labels.replaceKey(
"/Nums", QPDFObjectHandle::newArray(labels));
outpdf.getRoot().replaceKey("/PageLabels", page_labels);
}
std::string page_range = QUtil::int_to_string(first, pageno_len); std::string page_range = QUtil::int_to_string(first, pageno_len);
if (o.split_pages > 1) if (o.split_pages > 1)
{ {

1
qpdf/qpdf.testcov
View File

@ -360,3 +360,4 @@ qpdf disable keep files open 0
qpdf keep files open n 0 qpdf keep files open n 0
qpdf keep files open y 0 qpdf keep files open y 0
qpdf don't disable keep files open 0 qpdf don't disable keep files open 0
QPDFPageLabelDocumentHelper skip first 0

29
qpdf/qtest/qpdf.test
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@ -1137,7 +1137,7 @@ my @sp_cases = (
[11, 'pdf extension', '', 'split-out.Pdf'], [11, 'pdf extension', '', 'split-out.Pdf'],
[4, 'fallback', '--pages 11-pages.pdf 1-3 minimal.pdf --', 'split-out'], [4, 'fallback', '--pages 11-pages.pdf 1-3 minimal.pdf --', 'split-out'],
); );
$n_tests += 9; $n_tests += 12;
for (@sp_cases) for (@sp_cases)
{ {
$n_tests += 1 + $_->[0]; $n_tests += 1 + $_->[0];
@ -1171,6 +1171,17 @@ foreach my $i (qw(01-04 05-08 09-10))
{$td->FILE => "shared-split-$i.pdf"}); {$td->FILE => "shared-split-$i.pdf"});
} }
$td->runtest("split page with labels",
{$td->COMMAND => "qpdf --qdf --static-id --split-pages=6".
" 11-pages-with-labels.pdf split-out-labels.pdf"},
{$td->STRING => "", $td->EXIT_STATUS => 0});
foreach my $i (qw(01-06 07-11))
{
$td->runtest("check output ($i)",
{$td->FILE => "split-out-labels-$i.pdf"},
{$td->FILE => "labels-split-$i.pdf"});
}
foreach my $d (@sp_cases) foreach my $d (@sp_cases)
{ {
my ($n, $description, $xargs, $out) = @$d; my ($n, $description, $xargs, $out) = @$d;
@ -1335,7 +1346,7 @@ foreach my $d (@nrange_tests)
show_ntests(); show_ntests();
# ---------- # ----------
$td->notify("--- Merging and Splitting ---"); $td->notify("--- Merging and Splitting ---");
$n_tests += 16; $n_tests += 18;
# Select pages from the same file multiple times including selecting # Select pages from the same file multiple times including selecting
# twice from an encrypted file and specifying the password only the # twice from an encrypted file and specifying the password only the
@ -1368,8 +1379,7 @@ $td->runtest("merge three files",
" $pages_options --static-id"}, " $pages_options --static-id"},
{$td->STRING => "", $td->EXIT_STATUS => 0}); {$td->STRING => "", $td->EXIT_STATUS => 0});
# Manually verified about this file: it has the same pages but does # Manually verified about this file: it has the same pages but does
# not contain outlines, page labels, or other things from the original # not contain outlines or other things from the original file.
# file.
$td->runtest("check output", $td->runtest("check output",
{$td->FILE => "a.pdf"}, {$td->FILE => "a.pdf"},
{$td->FILE => "merge-three-files-2.pdf"}); {$td->FILE => "merge-three-files-2.pdf"});
@ -1392,6 +1402,17 @@ $td->runtest("merge with implicit ranges",
$td->runtest("check output", $td->runtest("check output",
{$td->FILE => "a.pdf"}, {$td->FILE => "a.pdf"},
{$td->FILE => "merge-implicit-ranges.pdf"}); {$td->FILE => "merge-implicit-ranges.pdf"});
$td->runtest("merge with multiple labels",
{$td->COMMAND =>
"qpdf --empty a.pdf" .
" --pages 11-pages-with-labels.pdf 8-11" .
" minimal.pdf " .
" page-labels-and-outlines.pdf 17-19 --" .
" --static-id"},
{$td->STRING => "", $td->EXIT_STATUS => 0});
$td->runtest("check output",
{$td->FILE => "a.pdf"},
{$td->FILE => "merge-multiple-labels.pdf"});
$td->runtest("split with shared resources", $td->runtest("split with shared resources",
{$td->COMMAND => {$td->COMMAND =>

BIN
qpdf/qtest/qpdf/11-pages-with-labels.pdf Normal file
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Binary file not shown.

324
qpdf/qtest/qpdf/labels-split-01-06.pdf Normal file
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@ -0,0 +1,324 @@
%PDF-1.3
%¿÷¢þ
%QDF-1.0
%% Original object ID: 1 0
1 0 obj
<<
/PageLabels <<
/Nums [
0
<<
/P (pre-)
/St 1
>>
4
<<
/S /r
/St 4
>>
]
>>
/Pages 2 0 R
/Type /Catalog
>>
endobj
%% Original object ID: 2 0
2 0 obj
<<
/Count 6
/Kids [
3 0 R
4 0 R
5 0 R
6 0 R
7 0 R
8 0 R
]
/Type /Pages
>>
endobj
%% Page 1
%% Original object ID: 3 0
3 0 obj
<<
/Contents 9 0 R
/MediaBox [
0
0
612
792
]
/Parent 2 0 R
/Resources <<
/Font <<
/F1 11 0 R
>>
/ProcSet [
/PDF
/Text
]
>>
/Type /Page
>>
endobj
%% Page 2
%% Original object ID: 6 0
4 0 obj
<<
/Contents 12 0 R
/MediaBox [
0
0
612
792
]
/Parent 2 0 R
/Resources <<
/Font <<
/F1 11 0 R
>>
/ProcSet [
/PDF
/Text
]
>>
/Type /Page
>>
endobj
%% Page 3
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5 0 obj
<<
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/MediaBox [
0
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612
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]
/Parent 2 0 R
/Resources <<
/Font <<
/F1 11 0 R
>>
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endobj
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endobj
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BT /F1 15 Tf 72 720 Td (Original page 2) Tj ET
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BT /F1 15 Tf 72 720 Td (Original page 4) Tj ET
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280
qpdf/qtest/qpdf/labels-split-07-11.pdf Normal file
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@ -0,0 +1,280 @@
%PDF-1.3
%¿÷¢þ
%QDF-1.0
%% Original object ID: 1 0
1 0 obj
<<
/PageLabels <<
/Nums [
0
<<
/S /r
/St 6
>>
2
<<
/S /a
/St 16
>>
]
>>
/Pages 2 0 R
/Type /Catalog
>>
endobj
%% Original object ID: 2 0
2 0 obj
<<
/Count 5
/Kids [
3 0 R
4 0 R
5 0 R
6 0 R
7 0 R
]
/Type /Pages
>>
endobj
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3 0 obj
<<
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/MediaBox [
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0
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]
/Parent 2 0 R
/Resources <<
/Font <<
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220
qpdf/qtest/qpdf/merge-implicit-ranges.pdf
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@ -1,7 +1,7 @@
%PDF-1.3 %PDF-1.3
%¿÷¢þ %¿÷¢þ
1 0 obj 1 0 obj
<< /Pages 2 0 R /Type /Catalog >> << /PageLabels << /Nums [ 0 << /St 1 >> 21 << /P () /St 1 >> 23 << /S /r /St 1 >> 28 << /P () /St 1 >> 30 << /S /r /St 6 >> 32 << /P () /St 1 >> 33 << /S /D /St 2 >> 36 << /S /D /St 6 >> 40 << /P () /St 1 >> 41 << /S /D /St 12 >> 43 << /S /D /St 16059 >> 44 << /S /r /St 50 >> 50 << /S /r /St 54 >> ] >> /Pages 2 0 R /Type /Catalog >>
endobj endobj
2 0 obj 2 0 obj
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@ -514,115 +514,115 @@ xref
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