mirror of
https://github.com/serge1/ELFIO.git
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320 lines
11 KiB
C++
320 lines
11 KiB
C++
/*
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Copyright (C) 2001-2015 by Serge Lamikhov-Center
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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#ifndef ELFIO_SECTION_HPP
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#define ELFIO_SECTION_HPP
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#include <string>
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#include <iostream>
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namespace ELFIO {
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class section
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{
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friend class elfio;
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public:
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virtual ~section() {};
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ELFIO_GET_ACCESS_DECL ( Elf_Half, index );
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ELFIO_GET_SET_ACCESS_DECL( std::string, name );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Word, type );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, flags );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Word, info );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Word, link );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, addr_align );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, entry_size );
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ELFIO_GET_SET_ACCESS_DECL( Elf64_Addr, address );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Xword, size );
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ELFIO_GET_SET_ACCESS_DECL( Elf_Word, name_string_offset );
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ELFIO_GET_ACCESS_DECL ( Elf64_Off, offset );
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virtual const char* get_data() const = 0;
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virtual void set_data( const char* pData, Elf_Word size ) = 0;
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virtual void set_data( const std::string& data ) = 0;
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virtual void append_data( const char* pData, Elf_Word size ) = 0;
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virtual void append_data( const std::string& data ) = 0;
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virtual size_t get_stream_size() const = 0;
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virtual void set_stream_size( size_t value ) = 0;
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protected:
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ELFIO_SET_ACCESS_DECL( Elf64_Off, offset );
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ELFIO_SET_ACCESS_DECL( Elf_Half, index );
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virtual void load( std::istream& stream,
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std::streampos header_offset ) = 0;
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virtual void save( std::ostream& stream,
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std::streampos header_offset,
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std::streampos data_offset ) = 0;
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virtual bool is_address_initialized() const = 0;
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};
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template< class T >
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class section_impl : public section
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{
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public:
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//------------------------------------------------------------------------------
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section_impl( const endianess_convertor* convertor_ ) : convertor( convertor_ )
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{
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std::fill_n( reinterpret_cast<char*>( &header ), sizeof( header ), '\0' );
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is_address_set = false;
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data = 0;
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data_size = 0;
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}
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//------------------------------------------------------------------------------
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~section_impl()
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{
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delete [] data;
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}
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//------------------------------------------------------------------------------
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// Section info functions
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ELFIO_GET_SET_ACCESS( Elf_Word, type, header.sh_type );
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ELFIO_GET_SET_ACCESS( Elf_Xword, flags, header.sh_flags );
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ELFIO_GET_SET_ACCESS( Elf_Xword, size, header.sh_size );
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ELFIO_GET_SET_ACCESS( Elf_Word, link, header.sh_link );
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ELFIO_GET_SET_ACCESS( Elf_Word, info, header.sh_info );
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ELFIO_GET_SET_ACCESS( Elf_Xword, addr_align, header.sh_addralign );
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ELFIO_GET_SET_ACCESS( Elf_Xword, entry_size, header.sh_entsize );
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ELFIO_GET_SET_ACCESS( Elf_Word, name_string_offset, header.sh_name );
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ELFIO_GET_ACCESS ( Elf64_Addr, address, header.sh_addr );
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//------------------------------------------------------------------------------
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Elf_Half
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get_index() const
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{
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return index;
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}
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//------------------------------------------------------------------------------
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std::string
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get_name() const
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{
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return name;
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}
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//------------------------------------------------------------------------------
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void
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set_name( std::string name_ )
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{
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name = name_;
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}
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//------------------------------------------------------------------------------
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void
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set_address( Elf64_Addr value )
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{
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header.sh_addr = value;
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header.sh_addr = (*convertor)( header.sh_addr );
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is_address_set = true;
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}
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//------------------------------------------------------------------------------
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bool
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is_address_initialized() const
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{
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return is_address_set;
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}
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//------------------------------------------------------------------------------
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const char*
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get_data() const
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{
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return data;
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}
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//------------------------------------------------------------------------------
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void
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set_data( const char* raw_data, Elf_Word size )
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{
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if ( get_type() != SHT_NOBITS ) {
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delete [] data;
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try {
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data = new char[size];
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} catch (const std::bad_alloc&) {
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data = 0;
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data_size = 0;
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size = 0;
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}
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if ( 0 != data && 0 != raw_data ) {
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data_size = size;
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std::copy( raw_data, raw_data + size, data );
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}
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}
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set_size( size );
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}
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//------------------------------------------------------------------------------
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void
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set_data( const std::string& str_data )
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{
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return set_data( str_data.c_str(), (Elf_Word)str_data.size() );
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}
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//------------------------------------------------------------------------------
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void
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append_data( const char* raw_data, Elf_Word size )
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{
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if ( get_type() != SHT_NOBITS ) {
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if ( get_size() + size < data_size ) {
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std::copy( raw_data, raw_data + size, data + get_size() );
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}
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else {
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data_size = 2*( data_size + size);
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char* new_data;
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try {
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new_data = new char[data_size];
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} catch (const std::bad_alloc&) {
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new_data = 0;
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size = 0;
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}
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if ( 0 != new_data ) {
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std::copy( data, data + get_size(), new_data );
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std::copy( raw_data, raw_data + size, new_data + get_size() );
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delete [] data;
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data = new_data;
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}
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}
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set_size( get_size() + size );
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}
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}
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//------------------------------------------------------------------------------
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void
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append_data( const std::string& str_data )
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{
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return append_data( str_data.c_str(), (Elf_Word)str_data.size() );
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}
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//------------------------------------------------------------------------------
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protected:
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//------------------------------------------------------------------------------
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ELFIO_GET_SET_ACCESS( Elf64_Off, offset, header.sh_offset );
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//------------------------------------------------------------------------------
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void
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set_index( Elf_Half value )
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{
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index = value;
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}
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//------------------------------------------------------------------------------
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void
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load( std::istream& stream,
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std::streampos header_offset )
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{
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std::fill_n( reinterpret_cast<char*>( &header ), sizeof( header ), '\0' );
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stream.seekg ( 0, stream.end );
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set_stream_size ( stream.tellg() );
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stream.seekg( header_offset );
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stream.read( reinterpret_cast<char*>( &header ), sizeof( header ) );
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Elf_Xword size = get_size();
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if ( 0 == data && SHT_NULL != get_type() && SHT_NOBITS != get_type() && size < get_stream_size()) {
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try {
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data = new char[size + 1];
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} catch (const std::bad_alloc&) {
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data = 0;
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data_size = 0;
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}
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if ( ( 0 != size ) && ( 0 != data ) ) {
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stream.seekg( (*convertor)( header.sh_offset ) );
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stream.read( data, size );
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data[size] = 0; // Ensure data is ended with 0 to avoid oob read
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data_size = size;
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}
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}
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}
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//------------------------------------------------------------------------------
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void
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save( std::ostream& stream,
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std::streampos header_offset,
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std::streampos data_offset )
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{
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if ( 0 != get_index() ) {
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header.sh_offset = data_offset;
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header.sh_offset = (*convertor)( header.sh_offset );
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}
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save_header( stream, header_offset );
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if ( get_type() != SHT_NOBITS && get_type() != SHT_NULL &&
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get_size() != 0 && data != 0 ) {
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save_data( stream, data_offset );
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}
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}
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//------------------------------------------------------------------------------
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private:
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//------------------------------------------------------------------------------
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void
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save_header( std::ostream& stream,
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std::streampos header_offset ) const
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{
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stream.seekp( header_offset );
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stream.write( reinterpret_cast<const char*>( &header ), sizeof( header ) );
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}
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//------------------------------------------------------------------------------
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void
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save_data( std::ostream& stream,
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std::streampos data_offset ) const
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{
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stream.seekp( data_offset );
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stream.write( get_data(), get_size() );
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}
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//------------------------------------------------------------------------------
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size_t get_stream_size() const
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{
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return stream_size;
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}
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//------------------------------------------------------------------------------
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void set_stream_size(size_t value)
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{
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stream_size = value;
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}
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//------------------------------------------------------------------------------
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private:
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T header;
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Elf_Half index;
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std::string name;
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char* data;
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Elf_Word data_size;
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const endianess_convertor* convertor;
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bool is_address_set;
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size_t stream_size;
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};
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} // namespace ELFIO
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#endif // ELFIO_SECTION_HPP
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