Version Requirements accessor (modifier) was added

elfio/elfio_versym.hpp

@@ -57,6 +57,30 @@ template <class S> class versym_section_accessor_template
         return false;
     }
 
+    //------------------------------------------------------------------------------
+    bool modify_entry( Elf_Word no, Elf_Half value )
+    {
+        if ( versym_section && ( no < get_entries_num() ) ) {
+            ( (Elf_Half*)versym_section->get_data() )[no] = value;
+            return true;
+        }
+
+        return false;
+    }
+
+    //------------------------------------------------------------------------------
+    bool add_entry( Elf_Half value )
+    {
+        if ( !versym_section ) {
+            return false;
+        }
+
+        versym_section->append_data( (const char*)&value, sizeof( Elf_Half ) );
+        ++entries_num;
+
+        return true;
+    }
+
     //------------------------------------------------------------------------------
   private:
     S*       versym_section;

tests/ELFIOTest2.cpp

@@ -421,6 +421,44 @@ BOOST_AUTO_TEST_CASE( gnu_version_64_le )
     BOOST_CHECK_EQUAL( dep_name, "GLIBC_2.2.5" );
 }
 
+////////////////////////////////////////////////////////////////////////////////
+BOOST_AUTO_TEST_CASE( gnu_version_64_le_modify )
+{
+    elfio reader;
+    // Load ELF data
+
+    BOOST_REQUIRE_EQUAL( reader.load( "elf_examples/hello_64" ), true );
+
+    std::string   name;
+    Elf64_Addr    value;
+    Elf_Xword     size;
+    unsigned char bind;
+    unsigned char type;
+    Elf_Half      section_index;
+    unsigned char other;
+
+    section*                gnu_version = reader.sections[".gnu.version"];
+    versym_section_accessor gnu_version_arr( gnu_version );
+
+    section*                  gnu_version_r = reader.sections[".gnu.version_r"];
+    versym_r_section_accessor gnu_version_r_arr( reader, gnu_version_r );
+
+    auto       orig_entries_num = gnu_version_arr.get_entries_num();
+    Elf64_Word i                = 0;
+    for ( i = 0; i < orig_entries_num; i++ ) {
+        gnu_version_arr.modify_entry( i, i + 10 );
+    }
+    gnu_version_arr.add_entry( i + 10 );
+    gnu_version_arr.add_entry( i + 11 );
+    BOOST_CHECK_EQUAL( orig_entries_num + 2,
+                       gnu_version_arr.get_entries_num() );
+
+    for ( i = 0; i < gnu_version_arr.get_entries_num(); i++ ) {
+        Elf_Half value;
+        gnu_version_arr.get_entry( i, value );
+        BOOST_CHECK_EQUAL( i + 10, value );
+    }
+}
 
 ////////////////////////////////////////////////////////////////////////////////
 BOOST_AUTO_TEST_CASE( move_constructor_and_assignment )