Add QPDFNumberTreeObjectHelper

1 files changed, 122 insertions, 0 deletions

diff --git a/libqpdf/QPDFNumberTreeObjectHelper.cc b/libqpdf/QPDFNumberTreeObjectHelper.cc
new file mode 100644
index 00000000..bf360cf5
--- /dev/null
+++ b/libqpdf/QPDFNumberTreeObjectHelper.cc
@@ -0,0 +1,122 @@
+#include <qpdf/QPDFNumberTreeObjectHelper.hh>
+#include <qpdf/QTC.hh>
+
+QPDFNumberTreeObjectHelper::Members::~Members()
+{
+}
+
+QPDFNumberTreeObjectHelper::Members::Members()
+{
+}
+
+QPDFNumberTreeObjectHelper::QPDFNumberTreeObjectHelper(QPDFObjectHandle oh) :
+    QPDFObjectHelper(oh),
+    m(new Members())
+{
+    updateMap(oh);
+}
+
+void
+QPDFNumberTreeObjectHelper::updateMap(QPDFObjectHandle oh)
+{
+    if (this->m->seen.count(oh.getObjGen()))
+    {
+        return;
+    }
+    this->m->seen.insert(oh.getObjGen());
+    QPDFObjectHandle nums = oh.getKey("/Nums");
+    if (nums.isArray())
+    {
+        size_t nitems = nums.getArrayNItems();
+        size_t i = 0;
+        while (i < nitems - 1)
+        {
+            QPDFObjectHandle num = nums.getArrayItem(i);
+            if (num.isInteger())
+            {
+                ++i;
+                QPDFObjectHandle obj = nums.getArrayItem(i);
+                this->m->entries[num.getIntValue()] = obj;
+            }
+            ++i;
+        }
+    }
+    QPDFObjectHandle kids = oh.getKey("/Kids");
+    if (kids.isArray())
+    {
+        size_t nitems = kids.getArrayNItems();
+        for (size_t i = 0; i < nitems; ++i)
+        {
+            updateMap(kids.getArrayItem(i));
+        }
+    }
+}
+
+
+QPDFNumberTreeObjectHelper::numtree_number
+QPDFNumberTreeObjectHelper::getMin()
+{
+    if (this->m->entries.empty())
+    {
+        return 0;
+    }
+    // Our map is sorted in reverse.
+    return this->m->entries.rbegin()->first;
+}
+
+QPDFNumberTreeObjectHelper::numtree_number
+QPDFNumberTreeObjectHelper::getMax()
+{
+    if (this->m->entries.empty())
+    {
+        return 0;
+    }
+    // Our map is sorted in reverse.
+    return this->m->entries.begin()->first;
+}
+
+bool
+QPDFNumberTreeObjectHelper::hasIndex(numtree_number idx)
+{
+    return this->m->entries.count(idx) != 0;
+}
+
+bool
+QPDFNumberTreeObjectHelper::findObject(
+    numtree_number idx, QPDFObjectHandle& oh)
+{
+    Members::idx_map::iterator i = this->m->entries.find(idx);
+    if (i == this->m->entries.end())
+    {
+        return false;
+    }
+    oh = (*i).second;
+    return true;
+}
+
+bool
+QPDFNumberTreeObjectHelper::findObjectAtOrBelow(
+    numtree_number idx, QPDFObjectHandle& oh,
+    numtree_number& offset)
+{
+    Members::idx_map::iterator i = this->m->entries.lower_bound(idx);
+    if (i == this->m->entries.end())
+    {
+        return false;
+    }
+    oh = (*i).second;
+    offset = idx - (*i).first;
+    return true;
+}
+
+std::map<QPDFNumberTreeObjectHelper::numtree_number, QPDFObjectHandle>
+QPDFNumberTreeObjectHelper::getAsMap() const
+{
+    std::map<numtree_number, QPDFObjectHandle> result;
+    for (Members::idx_map::const_iterator iter = this->m->entries.begin();
+         iter != this->m->entries.end(); ++iter)
+    {
+        result[(*iter).first] = (*iter).second;
+    }
+    return result;
+}