/*
Copyright (C) 2001-2011 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 ELFI_SECTION_HPP
#define ELFI_SECTION_HPP
#include <string>
#include <fstream>
#include "elf_types.hpp"
#include "elfio_utils.hpp"
namespace ELFIO {
class section
{
friend class elfio;
public:
virtual ~section() {};
virtual Elf_Half get_index() const = 0;
ELFIO_GET_SET_ACCESS_DECL( std::string, name );
ELFIO_GET_SET_ACCESS_DECL( Elf_Word, type );
ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, flags );
ELFIO_GET_SET_ACCESS_DECL( Elf_Word, info );
ELFIO_GET_SET_ACCESS_DECL( Elf_Word, link );
ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, addr_align );
ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, entry_size );
ELFIO_GET_SET_ACCESS_DECL( Elf64_Addr, address );
ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, size );
ELFIO_GET_SET_ACCESS_DECL( Elf_Word, name_string_offset );
virtual const char* get_data() const = 0;
virtual void set_data( const char* pData, Elf_Word size ) = 0;
virtual void set_data( const std::string& data ) = 0;
virtual void append_data( const char* pData, Elf_Word size ) = 0;
virtual void append_data( const std::string& data ) = 0;
protected:
virtual void set_index( Elf_Half ) = 0;
virtual void load( std::ifstream& f,
std::streampos header_offset ) = 0;
virtual void save( std::ofstream& f,
std::streampos header_offset,
std::streampos data_offset ) = 0;
virtual bool is_address_initialized() const = 0;
};
template< class T >
class section_impl : public section
{
public:
//------------------------------------------------------------------------------
section_impl( const endianess_convertor* convertor_ ) : convertor( convertor_ )
{
std::fill_n( reinterpret_cast<char*>( &header ), sizeof( header ), '\0' );
is_address_set = false;
data = 0;
data_size = 0;
}
//------------------------------------------------------------------------------
~section_impl()
{
delete [] data;
}
//------------------------------------------------------------------------------
// Section info functions
ELFIO_GET_SET_ACCESS( Elf_Word, type, header.sh_type );
ELFIO_GET_SET_ACCESS( Elf_Xword, flags, header.sh_flags );
ELFIO_GET_SET_ACCESS( Elf_Xword, size, header.sh_size );
ELFIO_GET_SET_ACCESS( Elf_Word, link, header.sh_link );
ELFIO_GET_SET_ACCESS( Elf_Word, info, header.sh_info );
ELFIO_GET_SET_ACCESS( Elf_Xword, addr_align, header.sh_addralign );
ELFIO_GET_SET_ACCESS( Elf_Xword, entry_size, header.sh_entsize );
ELFIO_GET_SET_ACCESS( Elf_Word, name_string_offset, header.sh_name );
ELFIO_GET_ACCESS ( Elf64_Addr, address, header.sh_addr );
//------------------------------------------------------------------------------
Elf_Half
get_index() const
{
return index;
}
//------------------------------------------------------------------------------
std::string
get_name() const
{
return name;
}
//------------------------------------------------------------------------------
void
set_name( std::string name_ )
{
name = name_;
}
//------------------------------------------------------------------------------
void
set_address( Elf64_Addr value )
{
header.sh_addr = value;
header.sh_addr = (*convertor)( header.sh_addr );
is_address_set = true;
}
//------------------------------------------------------------------------------
bool
is_address_initialized() const
{
return is_address_set;
}
//------------------------------------------------------------------------------
const char*
get_data() const
{
return data;
}
//------------------------------------------------------------------------------
void
set_data( const char* raw_data, Elf_Word size )
{
if ( get_type() != SHT_NOBITS ) {
delete [] data;
data = new char[size];
if ( 0 != data && 0 != raw_data ) {
data_size = size;
std::copy( raw_data, raw_data + size, data );
}
}
set_size( size );
}
//------------------------------------------------------------------------------
void
set_data( const std::string& str_data )
{
return set_data( str_data.c_str(), (Elf_Word)str_data.size() );
}
//------------------------------------------------------------------------------
void
append_data( const char* raw_data, Elf_Word size )
{
if ( get_type() != SHT_NOBITS ) {
if ( get_size() + size < data_size ) {
std::copy( raw_data, raw_data + size, data + get_size() );
}
else {
data_size = 2*( data_size + size);
char* new_data = new char[data_size];
if ( 0 != new_data ) {
std::copy( data, data + get_size(), new_data );
std::copy( raw_data, raw_data + size, new_data + get_size() );
delete [] data;
data = new_data;
}
}
set_size( get_size() + size );
}
}
//------------------------------------------------------------------------------
void
append_data( const std::string& str_data )
{
return append_data( str_data.c_str(), (Elf_Word)str_data.size() );
}
//------------------------------------------------------------------------------
protected:
//------------------------------------------------------------------------------
void
set_index( Elf_Half value )
{
index = value;
}
//------------------------------------------------------------------------------
void
load( std::ifstream& stream,
std::streampos header_offset )
{
std::fill_n( reinterpret_cast<char*>( &header ), sizeof( header ), '\0' );
stream.seekg( header_offset );
stream.read( reinterpret_cast<char*>( &header ), sizeof( header ) );
Elf_Xword size = get_size();
if ( 0 == data && SHT_NULL != get_type() && SHT_NOBITS != get_type() &&
0 != size ) {
data = new char[size];
stream.seekg( (*convertor)( header.sh_offset ) );
stream.read( data, size );
data_size = size;
}
}
//------------------------------------------------------------------------------
void
save( std::ofstream& f,
std::streampos header_offset,
std::streampos data_offset )
{
if ( 0 != get_index() ) {
header.sh_offset = data_offset;
header.sh_offset = (*convertor)( header.sh_offset );
}
save_header( f, header_offset );
if ( get_type() != SHT_NOBITS && get_type() != SHT_NULL &&
get_size() != 0 && data != 0 ) {
save_data( f, data_offset );
}
}
//------------------------------------------------------------------------------
private:
//------------------------------------------------------------------------------
void
save_header( std::ofstream& f,
std::streampos header_offset ) const
{
f.seekp( header_offset );
f.write( reinterpret_cast<const char*>( &header ), sizeof( header ) );
}
//------------------------------------------------------------------------------
void
save_data( std::ofstream& f,
std::streampos data_offset ) const
{
f.seekp( data_offset );
f.write( get_data(), get_size() );
}
//------------------------------------------------------------------------------
private:
mutable T header;
Elf_Half index;
std::string name;
char* data;
Elf_Word data_size;
const endianess_convertor* convertor;
bool is_address_set;
};
} // namespace ELFIO
#endif // ELFI_SECTION_HPP