From 3eb77a700434ed6d9b51e326fa4d49c530fcd473 Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Fri, 20 May 2022 09:57:30 -0400
Subject: JSON: detect duplicate dictionary keys while parsing

---
 include/qpdf/JSON.hh | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'include')

diff --git a/include/qpdf/JSON.hh b/include/qpdf/JSON.hh
index e711a2df..e6857ca6 100644
--- a/include/qpdf/JSON.hh
+++ b/include/qpdf/JSON.hh
@@ -42,6 +42,7 @@
 #include <list>
 #include <map>
 #include <memory>
+#include <set>
 #include <string>
 #include <vector>
 
@@ -149,6 +150,14 @@ class JSON
     QPDF_DLL
     bool isDictionary() const;
 
+    // If the key is already in the dictionary, return true.
+    // Otherwise, mark it has seen and return false. This is primarily
+    // intended to used by the parser to detect duplicate keys when
+    // the reactor blocks them from being added to the final
+    // dictionary.
+    QPDF_DLL
+    bool checkDictionaryKeySeen(std::string const& key);
+
     // Accessors. Accessor behavior:
     //
     // - If argument is wrong type, including null, return false
@@ -314,6 +323,7 @@ class JSON
         virtual ~JSON_dictionary() = default;
         virtual void write(Pipeline*, size_t depth) const;
         std::map<std::string, std::shared_ptr<JSON_value>> members;
+        std::set<std::string> parsed_keys;
     };
     struct JSON_array: public JSON_value
     {
-- 
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