mirror of
https://github.com/serge1/ELFIO.git
synced 2024-12-27 12:17:28 +00:00
379 lines
15 KiB
C++
379 lines
15 KiB
C++
/*
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Copyright (C) 2001-present 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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#include <new>
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#include <limits>
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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() = default;
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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 free_data() const = 0;
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virtual void set_data( const char* raw_data, 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* raw_data, Elf_Word size ) = 0;
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virtual void append_data( const std::string& data ) = 0;
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virtual void
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insert_data( Elf_Xword pos, const char* raw_data, Elf_Word size ) = 0;
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virtual void insert_data( Elf_Xword pos, 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 bool load( std::istream& stream,
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std::streampos header_offset,
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bool is_lazy ) = 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> 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,
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const address_translator* translator,
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const std::shared_ptr<compression_interface>& compression )
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: convertor( convertor ), translator( translator ),
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compression( compression )
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{
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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 get_index() const override { return index; }
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//------------------------------------------------------------------------------
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std::string get_name() const override { return name; }
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//------------------------------------------------------------------------------
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void set_name( const std::string& name_prm ) override
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{
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this->name = name_prm;
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}
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//------------------------------------------------------------------------------
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void set_address( const Elf64_Addr& value ) override
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{
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header.sh_addr = decltype( 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 is_address_initialized() const override { return is_address_set; }
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//------------------------------------------------------------------------------
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const char* get_data() const override
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{
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if ( !is_loaded ) {
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load_data();
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}
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return data.get();
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}
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//------------------------------------------------------------------------------
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void free_data() const override
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{
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if ( is_lazy ) {
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data.reset( nullptr );
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is_loaded = false;
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}
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}
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//------------------------------------------------------------------------------
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void set_data( const char* raw_data, Elf_Word size ) override
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{
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if ( get_type() != SHT_NOBITS ) {
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data = std::unique_ptr<char[]>( new ( std::nothrow ) char[size] );
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if ( nullptr != data.get() && nullptr != raw_data ) {
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data_size = size;
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std::copy( raw_data, raw_data + size, data.get() );
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}
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else {
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data_size = 0;
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}
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}
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set_size( data_size );
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if ( translator->empty() ) {
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set_stream_size( data_size );
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}
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}
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//------------------------------------------------------------------------------
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void set_data( const std::string& str_data ) override
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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 append_data( const char* raw_data, Elf_Word size ) override
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{
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insert_data( get_size(), raw_data, size );
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}
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//------------------------------------------------------------------------------
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void append_data( const std::string& str_data ) override
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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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void
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insert_data( Elf_Xword pos, const char* raw_data, Elf_Word size ) override
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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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char* d = data.get();
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std::copy_backward( d + pos, d + get_size(),
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d + get_size() + size );
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std::copy( raw_data, raw_data + size, d + pos );
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}
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else {
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data_size = 2 * ( data_size + size );
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std::unique_ptr<char[]> new_data(
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new ( std::nothrow ) char[data_size] );
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if ( nullptr != new_data ) {
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char* d = data.get();
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std::copy( d, d + pos, new_data.get() );
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std::copy( raw_data, raw_data + size,
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new_data.get() + pos );
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std::copy( d + pos, d + get_size(),
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new_data.get() + pos + size );
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data = std::move( new_data );
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}
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else {
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size = 0;
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}
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}
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set_size( get_size() + size );
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if ( translator->empty() ) {
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set_stream_size( get_stream_size() + size );
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}
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}
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}
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//------------------------------------------------------------------------------
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void insert_data( Elf_Xword pos, const std::string& str_data ) override
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{
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return insert_data( pos, str_data.c_str(), (Elf_Word)str_data.size() );
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}
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size_t get_stream_size() const override { return stream_size; }
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//------------------------------------------------------------------------------
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void set_stream_size( size_t value ) override { stream_size = value; }
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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 set_index( const Elf_Half& value ) override { index = value; }
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bool is_compressed() const
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{
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return ( ( get_flags() & SHF_RPX_DEFLATE ) ||
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( get_flags() & SHF_COMPRESSED ) ) &&
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compression != nullptr;
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}
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//------------------------------------------------------------------------------
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bool load( std::istream& stream,
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std::streampos header_offset,
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bool is_lazy_ ) override
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{
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pstream = &stream;
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is_lazy = is_lazy_;
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if ( translator->empty() ) {
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stream.seekg( 0, std::istream::end );
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set_stream_size( size_t( stream.tellg() ) );
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}
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else {
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set_stream_size( std::numeric_limits<size_t>::max() );
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}
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stream.seekg( ( *translator )[header_offset] );
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stream.read( reinterpret_cast<char*>( &header ), sizeof( header ) );
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if ( !( is_lazy || is_loaded ) ) {
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bool ret = load_data();
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if ( is_compressed() ) {
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Elf_Xword size = get_size();
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Elf_Xword uncompressed_size = 0;
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auto decompressed_data = compression->inflate(
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data.get(), convertor, size, uncompressed_size );
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if ( decompressed_data != nullptr ) {
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set_size( uncompressed_size );
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data = std::move( decompressed_data );
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}
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}
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return ret;
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}
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return true;
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}
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bool load_data() const
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{
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Elf_Xword size = get_size();
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if ( nullptr == data && SHT_NULL != get_type() &&
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SHT_NOBITS != get_type() && size < get_stream_size() ) {
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data.reset( new ( std::nothrow ) char[size_t( size ) + 1] );
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if ( ( 0 != size ) && ( nullptr != data ) ) {
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pstream->seekg(
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( *translator )[( *convertor )( header.sh_offset )] );
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pstream->read( data.get(), size );
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if ( static_cast<Elf_Xword>( pstream->gcount() ) != size ) {
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data = nullptr;
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return false;
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}
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// refresh size because it may have changed if we had to decompress data
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size = get_size();
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data.get()[size] =
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0; // Ensure data is ended with 0 to avoid oob read
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data_size = decltype( data_size )( size );
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}
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else {
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data_size = 0;
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}
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}
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is_loaded = true;
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return true;
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}
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//------------------------------------------------------------------------------
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void save( std::ostream& stream,
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std::streampos header_offset,
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std::streampos data_offset ) override
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{
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if ( 0 != get_index() ) {
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header.sh_offset = decltype( 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 != nullptr ) {
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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 save_header( std::ostream& stream, std::streampos header_offset ) const
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{
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adjust_stream_size( stream, header_offset );
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stream.write( reinterpret_cast<const char*>( &header ),
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sizeof( header ) );
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}
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//------------------------------------------------------------------------------
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void save_data( std::ostream& stream, std::streampos data_offset )
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{
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adjust_stream_size( stream, data_offset );
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if ( ( ( get_flags() & SHF_COMPRESSED ) ||
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( get_flags() & SHF_RPX_DEFLATE ) ) &&
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compression != nullptr ) {
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Elf_Xword decompressed_size = get_size();
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Elf_Xword compressed_size = 0;
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auto compressed_ptr = compression->deflate(
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data.get(), convertor, decompressed_size, compressed_size );
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stream.write( compressed_ptr.get(), compressed_size );
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}
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else {
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stream.write( get_data(), get_size() );
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}
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}
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//------------------------------------------------------------------------------
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private:
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mutable std::istream* pstream = nullptr;
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T header = {};
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Elf_Half index = 0;
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std::string name;
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mutable std::unique_ptr<char[]> data;
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mutable Elf_Word data_size = 0;
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const endianess_convertor* convertor = nullptr;
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const address_translator* translator = nullptr;
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const std::shared_ptr<compression_interface> compression = nullptr;
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bool is_address_set = false;
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size_t stream_size = 0;
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mutable bool is_lazy = false;
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mutable bool is_loaded = false;
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};
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} // namespace ELFIO
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#endif // ELFIO_SECTION_HPP
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