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Code Issues Releases Wiki Activity

Use QPDFNameTreeObjectHelper's iterator directly

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This commit is contained in:
Jay Berkenbilt 2021-01-16 12:11:35 -05:00
parent 5f0708418a
commit ba814703fb
5 changed files with 20 additions and 5 deletions
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8
ChangeLog
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@ -1,5 +1,13 @@
2021-01-16 Jay Berkenbilt <ejb@ql.org>
* Re-implement QPDFNameTreeObjectHelper and
QPDFNumberTreeObjectHelper to be much more efficient and to have
an iterator-based API in addition to the existing one. This makes
it possible to use "range-for" loops over these helpers and to
iterate through name and number trees without creating a map
containing all the keys and values, which is slow and potentially
consumes a lot of memory.
* Add warn() to QPDF's public API.
2021-01-11 Jay Berkenbilt <ejb@ql.org>

2
include/qpdf/QPDFNameTreeObjectHelper.hh
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@ -53,7 +53,7 @@ class QPDFNameTreeObjectHelper: public QPDFObjectHelper
bool hasName(std::string const& utf8);
// Find an object by name. If found, returns true and initializes
// oh.
// oh. See also find().
QPDF_DLL
bool findObject(std::string const& utf8, QPDFObjectHandle& oh);

5
include/qpdf/QPDFNumberTreeObjectHelper.hh
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@ -60,7 +60,7 @@ class QPDFNumberTreeObjectHelper: public QPDFObjectHelper
bool hasIndex(numtree_number idx);
// Find an object with a specific index. If found, returns true
// and initializes oh.
// and initializes oh. See also find().
QPDF_DLL
bool findObject(numtree_number idx, QPDFObjectHandle& oh);
// Find the object at the index or, if not found, the object whose
@ -70,7 +70,8 @@ class QPDFNumberTreeObjectHelper: public QPDFObjectHelper
// offset to the difference between the requested index and the
// actual index. For example, if a number tree has values for 3
// and 6 and idx is 5, this method would return true, initialize
// oh to the value with index 3, and set offset to 2 (5 - 3).
// oh to the value with index 3, and set offset to 2 (5 - 3). See
// also find().
QPDF_DLL
bool findObjectAtOrBelow(numtree_number idx, QPDFObjectHandle& oh,
numtree_number& offset);

3
libqpdf/QPDF.cc
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@ -3011,8 +3011,7 @@ QPDF::findAttachmentStreams()
return;
}
QPDFNameTreeObjectHelper ef_tree(embedded_files);
auto ef_tree_map = ef_tree.getAsMap();
for (auto& i: ef_tree_map)
for (auto i: ef_tree)
{
QPDFObjectHandle item = i.second;
if (item.isDictionary() &&

7
manual/qpdf-manual.xml
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@ -4833,6 +4833,13 @@ print "\n";
<classname>QPDF</classname>'s public API.
</para>
</listitem>
<listitem>
<para>
Re-implement <classname>QPDFNameTreeObjectHelper</classname>
and <classname>QPDFNumberTreeObjectHelper</classname> to be
more efficient, and add an iterator-based API.
</para>
</listitem>
</itemizedlist>
</listitem>
</itemizedlist>