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Add QPDFObjectHandle::shallowCopy()
This commit is contained in:
Jay Berkenbilt
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commit
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@ -1,5 +1,7 @@
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2012-06-21 Jay Berkenbilt <ejb@ql.org>
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* QPDFObjectHandle: add shallowCopy() method
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* QPDF: add new APIs for adding and removing pages. This includes
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addPage(), addPageAt(), and removePage(). Also a method
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updateAllPagesCache() is now available to force update of the
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@ -190,6 +190,13 @@ class QPDFObjectHandle
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QPDF_DLL
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bool isOrHasName(std::string const&);
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// Create a shallow copy of an object as a direct object. Since
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// this is a shallow copy, for dictionaries and arrays, any keys
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// or items that were indirect objects will still be indirect
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// objects that point to the same place.
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QPDF_DLL
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QPDFObjectHandle shallowCopy();
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// Mutator methods. Use with caution.
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// Recursively copy this object, making it direct. Throws an
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@ -663,6 +663,38 @@ QPDFObjectHandle::newStream(QPDF* qpdf, PointerHolder<Buffer> data)
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return result;
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}
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QPDFObjectHandle
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QPDFObjectHandle::shallowCopy()
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{
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assertInitialized();
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if (isStream())
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{
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QTC::TC("qpdf", "QPDFObjectHandle ERR shallow copy stream");
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throw std::runtime_error(
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"attempt to make a shallow copy of a stream");
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}
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QPDFObjectHandle new_obj;
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if (isArray())
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{
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QTC::TC("qpdf", "QPDFObjectHandle shallow copy array");
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new_obj = newArray(getArrayAsVector());
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}
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else if (isDictionary())
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{
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QTC::TC("qpdf", "QPDFObjectHandle shallow copy dictionary");
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new_obj = newDictionary(getDictAsMap());
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}
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else
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{
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QTC::TC("qpdf", "QPDFObjectHandle shallow copy scalar");
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new_obj = *this;
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}
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return new_obj;
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}
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void
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QPDFObjectHandle::makeDirectInternal(std::set<int>& visited)
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{
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@ -209,3 +209,7 @@ QPDF insert page 2
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QPDF updateAllPagesCache 0
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QPDF insert non-indirect page 0
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QPDF insert indirect page 0
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QPDFObjectHandle ERR shallow copy stream 0
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QPDFObjectHandle shallow copy array 0
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QPDFObjectHandle shallow copy dictionary 0
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QPDFObjectHandle shallow copy scalar 0
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@ -144,7 +144,7 @@ $td->runtest("duplicate page",
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$td->NORMALIZE_NEWLINES);
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# ----------
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$td->notify("--- Miscellaneous Tests ---");
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$n_tests += 37;
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$n_tests += 40;
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$td->runtest("qpdf version",
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{$td->COMMAND => "qpdf --version"},
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@ -338,6 +338,18 @@ $td->runtest("check output",
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{$td->FILE => "c-info-out.pdf"});
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unlink "a.pdf" or die;
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$td->runtest("shallow copy an array",
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{$td->COMMAND => "test_driver 20 shallow_array.pdf"},
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{$td->STRING => "test 20 done\n", $td->EXIT_STATUS => 0},
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$td->NORMALIZE_NEWLINES);
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$td->runtest("check output",
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{$td->FILE => "a.pdf"},
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{$td->FILE => "shallow_array-out.pdf"});
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$td->runtest("shallow copy a stream",
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{$td->COMMAND => "test_driver 21 shallow_array.pdf"},
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{$td->FILE => "shallow_stream.out", $td->EXIT_STATUS => 2},
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$td->NORMALIZE_NEWLINES);
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show_ntests();
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# ----------
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$td->notify("--- Error Condition Tests ---");
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40
qpdf/qtest/qpdf/shallow_array-out.pdf
Normal file
40
qpdf/qtest/qpdf/shallow_array-out.pdf
Normal file
@ -0,0 +1,40 @@
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%PDF-1.3
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%¿÷¢þ
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1 0 obj
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<< /Pages 2 0 R /Type /Catalog >>
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endobj
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2 0 obj
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<< /Count 1 /Kids [ 3 0 R ] /Type /Pages >>
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endobj
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3 0 obj
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<< /Contents 4 0 R /MediaBox [ 0 0 612 792 ] /Parent 2 0 R /Resources << /Font << /F1 5 0 R >> /ProcSet 6 0 R >> /Type /Page >>
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endobj
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4 0 obj
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<< /Length 44 >>
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stream
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BT
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/F1 24 Tf
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72 720 Td
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(Potato) Tj
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ET
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endstream
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endobj
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5 0 obj
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<< /BaseFont /Helvetica /Encoding /WinAnsiEncoding /Name /F1 /Subtype /Type1 /Type /Font >>
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endobj
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6 0 obj
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[ /PDF /Text ]
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endobj
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xref
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0 7
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0000000000 65535 f
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0000000015 00000 n
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0000000064 00000 n
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0000000123 00000 n
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0000000266 00000 n
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0000000359 00000 n
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0000000466 00000 n
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trailer << /QTest [ /A 1 0 R /B ] /QTest2 [ /A 1 0 R /B 7 ] /Root 1 0 R /Size 7 /ID [<31415926535897932384626433832795><31415926535897932384626433832795>] >>
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startxref
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496
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%%EOF
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80
qpdf/qtest/qpdf/shallow_array.pdf
Normal file
80
qpdf/qtest/qpdf/shallow_array.pdf
Normal file
@ -0,0 +1,80 @@
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%PDF-1.3
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1 0 obj
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<<
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/Type /Catalog
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/Pages 2 0 R
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>>
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endobj
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2 0 obj
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<<
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/Type /Pages
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/Kids [
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3 0 R
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]
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/Count 1
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>>
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endobj
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3 0 obj
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<<
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/Type /Page
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/Parent 2 0 R
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/MediaBox [0 0 612 792]
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/Contents 4 0 R
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/Resources <<
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/ProcSet 5 0 R
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/Font <<
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/F1 6 0 R
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>>
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>>
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>>
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endobj
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4 0 obj
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<<
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/Length 44
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>>
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stream
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BT
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/F1 24 Tf
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72 720 Td
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(Potato) Tj
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ET
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endstream
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endobj
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5 0 obj
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[
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/PDF
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/Text
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]
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endobj
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6 0 obj
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<<
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/Type /Font
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/Subtype /Type1
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/Name /F1
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/BaseFont /Helvetica
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/Encoding /WinAnsiEncoding
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>>
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endobj
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xref
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0 7
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0000000000 65535 f
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0000000009 00000 n
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0000000063 00000 n
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0000000135 00000 n
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0000000307 00000 n
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0000000403 00000 n
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0000000438 00000 n
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trailer <<
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/Size 7
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/Root 1 0 R
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/QTest [ /A 1 0 R /B ]
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>>
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startxref
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556
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%%EOF
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1
qpdf/qtest/qpdf/shallow_stream.out
Normal file
1
qpdf/qtest/qpdf/shallow_stream.out
Normal file
@ -0,0 +1 @@
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attempt to make a shallow copy of a stream
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@ -691,17 +691,15 @@ void runtest(int n, char const* filename)
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// dictionary and modify it. Using the results of
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// getDictAsMap to create a new dictionary effectively creates
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// a shallow copy.
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std::map<std::string, QPDFObjectHandle> page_dict_keys =
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QPDFObjectHandle(pages[0]).getDictAsMap();
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QPDFObjectHandle page_tempate = pages[0];
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std::vector<QPDFObjectHandle> new_pages;
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for (std::vector<QPDFObjectHandle>::iterator iter = contents.begin();
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iter != contents.end(); ++iter)
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{
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// We will retain indirect object references to other
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// indirect objects other than page content.
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page_dict_keys["/Contents"] = *iter;
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QPDFObjectHandle page =
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QPDFObjectHandle::newDictionary(page_dict_keys);
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QPDFObjectHandle page = page_tempate.shallowCopy();
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page.replaceKey("/Contents", *iter);
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if (iter == contents.begin())
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{
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// leave direct
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@ -745,12 +743,10 @@ void runtest(int n, char const* filename)
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std::vector<QPDFObjectHandle> const& all_pages = pdf.getAllPages();
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QPDFObjectHandle contents = createPageContents(pdf, "New page 10");
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std::map<std::string, QPDFObjectHandle> page_dict_keys =
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QPDFObjectHandle(all_pages[0]).getDictAsMap();
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page_dict_keys["/Contents"] = contents;
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QPDFObjectHandle page =
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pdf.makeIndirectObject(
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QPDFObjectHandle::newDictionary(page_dict_keys));
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QPDFObjectHandle(all_pages[0]).shallowCopy());
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page.replaceKey("/Contents", contents);
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// Insert the page manually.
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QPDFObjectHandle root = pdf.getRoot();
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@ -807,6 +803,30 @@ void runtest(int n, char const* filename)
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pdf.addPage(pages[5], false);
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std::cout << "you can't see this" << std::endl;
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}
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else if (n == 20)
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{
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// Shallow copy an array
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QPDFObjectHandle trailer = pdf.getTrailer();
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QPDFObjectHandle qtest = trailer.getKey("/QTest");
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QPDFObjectHandle copy = qtest.shallowCopy();
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// Append shallow copy of a scalar
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copy.appendItem(trailer.getKey("/Size").shallowCopy());
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trailer.replaceKey("/QTest2", copy);
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QPDFWriter w(pdf, "a.pdf");
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w.setStaticID(true);
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w.setStreamDataMode(qpdf_s_preserve);
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w.write();
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}
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else if (n == 21)
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{
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// Try to shallow copy a stream
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std::vector<QPDFObjectHandle> const& pages = pdf.getAllPages();
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QPDFObjectHandle page = pages[0];
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QPDFObjectHandle contents = page.getKey("/Contents");
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contents.shallowCopy();
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std::cout << "you can't see this" << std::endl;
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}
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else
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{
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throw std::runtime_error(std::string("invalid test ") +
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