Add document and object helpers for outlines (bookmarks)

1 files changed, 137 insertions, 0 deletions

diff --git a/libqpdf/QPDFOutlineDocumentHelper.cc b/libqpdf/QPDFOutlineDocumentHelper.cc
new file mode 100644
index 00000000..411ccf34
--- /dev/null
+++ b/libqpdf/QPDFOutlineDocumentHelper.cc
@@ -0,0 +1,137 @@
+#include <qpdf/QPDFOutlineDocumentHelper.hh>
+#include <qpdf/QTC.hh>
+
+QPDFOutlineDocumentHelper::Members::~Members()
+{
+}
+
+QPDFOutlineDocumentHelper::Members::Members()
+{
+}
+
+QPDFOutlineDocumentHelper::QPDFOutlineDocumentHelper(QPDF& qpdf) :
+    QPDFDocumentHelper(qpdf),
+    m(new Members())
+{
+    QPDFObjectHandle root = qpdf.getRoot();
+    if (! root.hasKey("/Outlines"))
+    {
+        return;
+    }
+    QPDFObjectHandle outlines = root.getKey("/Outlines");
+    if (! (outlines.isDictionary() && outlines.hasKey("/First")))
+    {
+        return;
+    }
+    QPDFObjectHandle cur = outlines.getKey("/First");
+    while (! cur.isNull())
+    {
+        this->m->outlines.push_back(
+            QPDFOutlineObjectHelper::Accessor::create(cur, *this, 1));
+        cur = cur.getKey("/Next");
+    }
+}
+
+QPDFOutlineDocumentHelper::~QPDFOutlineDocumentHelper()
+{
+}
+
+bool
+QPDFOutlineDocumentHelper::hasOutlines()
+{
+    return ! this->m->outlines.empty();
+}
+
+std::list<QPDFOutlineObjectHelper>
+QPDFOutlineDocumentHelper::getTopLevelOutlines()
+{
+    return this->m->outlines;
+}
+
+void
+QPDFOutlineDocumentHelper::initializeByPage()
+{
+    std::list<QPDFOutlineObjectHelper> queue;
+    queue.insert(queue.end(), this->m->outlines.begin(), this->m->outlines.end());
+
+    while (! queue.empty())
+    {
+        QPDFOutlineObjectHelper oh = queue.front();
+        queue.pop_front();
+        this->m->by_page[oh.getDestPage().getObjGen()].push_back(oh);
+        std::list<QPDFOutlineObjectHelper> kids = oh.getKids();
+        queue.insert(queue.end(), kids.begin(), kids.end());
+    }
+}
+
+std::list<QPDFOutlineObjectHelper>
+QPDFOutlineDocumentHelper::getOutlinesForPage(QPDFObjGen const& og)
+{
+    if (this->m->by_page.empty())
+    {
+        initializeByPage();
+    }
+    std::list<QPDFOutlineObjectHelper> result;
+    if (this->m->by_page.count(og))
+    {
+        result = this->m->by_page[og];
+    }
+    return result;
+}
+
+QPDFObjectHandle
+QPDFOutlineDocumentHelper::resolveNamedDest(QPDFObjectHandle name)
+{
+    QPDFObjectHandle result;
+    if (name.isName())
+    {
+        if (! this->m->dest_dict.isInitialized())
+        {
+            this->m->dest_dict = this->qpdf.getRoot().getKey("/Dests");
+        }
+        if (this->m->dest_dict.isDictionary())
+        {
+            QTC::TC("qpdf", "QPDFOutlineDocumentHelper name named dest");
+            result = this->m->dest_dict.getKey(name.getName());
+        }
+    }
+    else if (name.isString())
+    {
+        if (0 == this->m->names_dest.getPointer())
+        {
+            QPDFObjectHandle names = this->qpdf.getRoot().getKey("/Names");
+            if (names.isDictionary())
+            {
+                QPDFObjectHandle dests = names.getKey("/Dests");
+                if (dests.isDictionary())
+                {
+                    this->m->names_dest =
+                        new QPDFNameTreeObjectHelper(dests);
+                }
+            }
+        }
+        if (this->m->names_dest.getPointer())
+        {
+            if (this->m->names_dest->findObject(name.getUTF8Value(), result))
+            {
+                QTC::TC("qpdf", "QPDFOutlineDocumentHelper string named dest");
+            }
+        }
+    }
+    if (! result.isInitialized())
+    {
+        result = QPDFObjectHandle::newNull();
+    }
+    return result;
+}
+
+bool
+QPDFOutlineDocumentHelper::checkSeen(QPDFObjGen const& og)
+{
+    if (this->m->seen.count(og) > 0)
+    {
+        return true;
+    }
+    this->m->seen.insert(og);
+    return false;
+}