check map tag size in create functions too, for consistency, i think we should indeed remove the direct map access and constructor, see comment in ticket 129

git-svn-id: svn://bind10.isc.org/svn/bind10/trunk@1668 e5f2f494-b856-4b98-b285-d166d9295462

src/lib/cc/data.cc

@@ -249,6 +249,12 @@ Element::create(const std::vector<ElementPtr>& v) {
 
 ElementPtr
 Element::create(const std::map<std::string, ElementPtr>& m) {
+    for (std::map<std::string, ElementPtr>::const_iterator it = m.begin();
+         it != m.end(); ++it) {
+        if ((*it).first.length() > 255) {
+            isc_throw(TypeError, "Map tag is too long");
+        }
+    }
     try {
         return ElementPtr(new MapElement(m));
     } catch (std::bad_alloc) {

src/lib/cc/data_unittests.cc

@@ -211,15 +211,25 @@ TEST(Element, MapElement) {
                        "9123456789abcdefa123456789abcdefb123456789abcdef"
                        "c123456789abcdefd123456789abcdefe123456789abcdef"
                        "f123456789abcde");
+    std::map<std::string, ElementPtr> long_maptag_map;
+    
     EXPECT_EQ(255, long_maptag.length()); // check prerequisite
     el = Element::createFromString("{ \"" + long_maptag + "\": \"bar\"}");
     EXPECT_EQ("bar", el->find(long_maptag)->stringValue());
 
+    long_maptag_map[long_maptag] = Element::create("bar");
+    el = Element::create(long_maptag_map);
+    EXPECT_EQ("bar", el->find(long_maptag)->stringValue());
+
     // A one-byte longer tag should trigger an exception.
     long_maptag.push_back('f');
     EXPECT_THROW(Element::createFromString("{ \"" + long_maptag +
                                            "\": \"bar\"}"),
                  ParseError);
+
+    long_maptag_map[long_maptag] = Element::create("bar");
+    EXPECT_THROW(Element::create(long_maptag_map), TypeError);
+
 }
 
 TEST(Element, to_and_from_wire) {