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Avoid traversing same object twice when copying objects

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This is a performance fix.  The output is unchanged.

Fixes #28.
This commit is contained in:
Jay Berkenbilt 2013-12-26 11:51:50 -05:00
parent 0b6127558d
commit c9a9fe9c2f
3 changed files with 14 additions and 0 deletions
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8
ChangeLog
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@ -1,3 +1,11 @@
2013-12-26 Jay Berkenbilt <ejb@ql.org>
* Bug fix: when copying foreign objects (which occurs during page
splitting among other cases), avoid traversing the same object
more than once if it appears more than once in the same direct
object. This bug is performance-only and does not affect the
actual output.
2013-12-17 Jay Berkenbilt <ejb@ql.org> 2013-12-17 Jay Berkenbilt <ejb@ql.org>
* 5.1.0: release * 5.1.0: release

5
libqpdf/QPDF.cc
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@ -1755,6 +1755,11 @@ QPDF::reserveObjects(QPDFObjectHandle foreign, ObjCopier& obj_copier,
QTC::TC("qpdf", "QPDF loop reserving objects"); QTC::TC("qpdf", "QPDF loop reserving objects");
return; return;
} }
if (obj_copier.object_map.find(foreign_og) != obj_copier.object_map.end())
{
QTC::TC("qpdf", "QPDF already reserved object");
return;
}
QTC::TC("qpdf", "QPDF copy indirect"); QTC::TC("qpdf", "QPDF copy indirect");
obj_copier.visiting.insert(foreign_og); obj_copier.visiting.insert(foreign_og);
std::map<QPDFObjGen, QPDFObjectHandle>::iterator mapping = std::map<QPDFObjGen, QPDFObjectHandle>::iterator mapping =

1
qpdf/qpdf.testcov
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@ -268,3 +268,4 @@ QPDF xref space 2
qpdf pages range omitted at end 0 qpdf pages range omitted at end 0
qpdf pages range omitted in middle 0 qpdf pages range omitted in middle 0
qpdf npages 0 qpdf npages 0
QPDF already reserved object 0