diff options
Diffstat (limited to 'libqpdf/QPDF_pages.cc')
| -rw-r--r-- | libqpdf/QPDF_pages.cc | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/libqpdf/QPDF_pages.cc b/libqpdf/QPDF_pages.cc index 44db064c..f9b421c6 100644 --- a/libqpdf/QPDF_pages.cc +++ b/libqpdf/QPDF_pages.cc @@ -56,6 +56,24 @@ void QPDF::getAllPagesInternal(QPDFObjectHandle cur_pages, std::vector<QPDFObjectHandle>& result) { + std::set<QPDFObjGen> visited; + getAllPagesInternal2(cur_pages, result, visited); +} + +void +QPDF::getAllPagesInternal2(QPDFObjectHandle cur_pages, + std::vector<QPDFObjectHandle>& result, + std::set<QPDFObjGen>& visited) +{ + QPDFObjGen this_og = cur_pages.getObjGen(); + if (visited.count(this_og) > 0) + { + throw QPDFExc( + qpdf_e_pages, this->file->getName(), + this->last_object_description, 0, + "Loop detected in /Pages structure (getAllPages)"); + } + visited.insert(this_og); std::string type; QPDFObjectHandle type_key = cur_pages.getKey("/Type"); if (type_key.isName()) @@ -76,7 +94,7 @@ QPDF::getAllPagesInternal(QPDFObjectHandle cur_pages, int n = kids.getArrayNItems(); for (int i = 0; i < n; ++i) { - getAllPagesInternal(kids.getArrayItem(i), result); + getAllPagesInternal2(kids.getArrayItem(i), result, visited); } } else if (type == "/Page") @@ -90,6 +108,7 @@ QPDF::getAllPagesInternal(QPDFObjectHandle cur_pages, this->file->getLastOffset(), "invalid Type " + type + " in page tree"); } + visited.erase(this_og); } void |