First commit, Vystem v0.1

vyld/elfio/elfio_array.hpp

@@ -0,0 +1,119 @@
+/*
+Copyright (C) 2001-present by Serge Lamikhov-Center
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+
+#ifndef ELFIO_ARRAY_HPP
+#define ELFIO_ARRAY_HPP
+
+#include <algorithm>
+
+namespace ELFIO {
+
+//------------------------------------------------------------------------------
+// Template class for accessing array sections
+template <class S, typename T> class array_section_accessor_template
+{
+  public:
+    //------------------------------------------------------------------------------
+    // Constructor
+    explicit array_section_accessor_template( const elfio& elf_file,
+                                              S*           section );
+
+    //------------------------------------------------------------------------------
+    // Returns the number of entries in the array section
+    Elf_Xword get_entries_num() const;
+
+    //------------------------------------------------------------------------------
+    // Retrieves an entry from the array section
+    bool get_entry( Elf_Xword index, Elf64_Addr& address ) const;
+
+    //------------------------------------------------------------------------------
+    // Adds an entry to the array section
+    void add_entry( Elf64_Addr address );
+
+  private:
+    //------------------------------------------------------------------------------
+    // Reference to the ELF file
+    const elfio& elf_file;
+    //------------------------------------------------------------------------------
+    // Pointer to the array section
+    S* array_section;
+};
+
+//------------------------------------------------------------------------------
+// Constructor
+template <class S, typename T>
+array_section_accessor_template<S, T>::array_section_accessor_template(
+    const elfio& elf_file, S* section )
+    : elf_file( elf_file ), array_section( section )
+{
+}
+
+//------------------------------------------------------------------------------
+// Returns the number of entries in the array section
+template <class S, typename T>
+Elf_Xword array_section_accessor_template<S, T>::get_entries_num() const
+{
+    Elf_Xword entry_size = sizeof( T );
+    return array_section->get_size() / entry_size;
+}
+
+//------------------------------------------------------------------------------
+// Retrieves an entry from the array section
+template <class S, typename T>
+bool array_section_accessor_template<S, T>::get_entry(
+    Elf_Xword index, Elf64_Addr& address ) const
+{
+    if ( index >= get_entries_num() ) { // Is index valid
+        return false;
+    }
+
+    const auto& convertor = elf_file.get_convertor();
+
+    const T temp = *reinterpret_cast<const T*>( array_section->get_data() +
+                                                index * sizeof( T ) );
+    address      = ( *convertor )( temp );
+
+    return true;
+}
+
+//------------------------------------------------------------------------------
+// Adds an entry to the array section
+template <class S, typename T>
+void array_section_accessor_template<S, T>::add_entry( Elf64_Addr address )
+{
+    const auto& convertor = elf_file.get_convertor();
+
+    T temp = ( *convertor )( (T)address );
+    array_section->append_data( reinterpret_cast<char*>( &temp ),
+                                sizeof( temp ) );
+}
+
+// Type aliases for array section accessors
+template <typename T = Elf32_Word>
+using array_section_accessor = array_section_accessor_template<section, T>;
+template <typename T = Elf32_Word>
+using const_array_section_accessor =
+    array_section_accessor_template<const section, T>;
+
+} // namespace ELFIO
+
+#endif // ELFIO_ARRAY_HPP