xref: /third_party/elfio/examples/tutorial/tutorial.cpp

/*
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.
*/

#include <iostream>
#include <elfio/elfio.hpp>

using namespace ELFIO;

int main( int argc, char** argv )
{
    if ( argc != 2 ) {
        std::cout << "Usage: tutorial <elf_file>" << std::endl;
        return 1;
    }

    // Create an elfio reader
    elfio reader;

    // Load ELF data
    if ( !reader.load( argv[1] ) ) {
        std::cout << "Can't find or process ELF file " << argv[1] << std::endl;
        return 2;
    }

    // Print ELF file properties
    std::cout << "ELF file class    : ";
    if ( reader.get_class() == ELFCLASS32 )
        std::cout << "ELF32" << std::endl;
    else
        std::cout << "ELF64" << std::endl;

    std::cout << "ELF file encoding : ";
    if ( reader.get_encoding() == ELFDATA2LSB )
        std::cout << "Little endian" << std::endl;
    else
        std::cout << "Big endian" << std::endl;

    // Print ELF file sections info
    Elf_Half sec_num = reader.sections.size();
    std::cout << "Number of sections: " << sec_num << std::endl;
    for ( int i = 0; i < sec_num; ++i ) {
        section* psec = reader.sections[i];
        std::cout << "  [" << i << "] " << psec->get_name() << "\t"
                  << psec->get_size() << std::endl;
        // Access to section's data
        // const char* p = reader.sections[i]->get_data()
    }

    // Print ELF file segments info
    Elf_Half seg_num = reader.segments.size();
    std::cout << "Number of segments: " << seg_num << std::endl;
    for ( int i = 0; i < seg_num; ++i ) {
        const segment* pseg = reader.segments[i];
        std::cout << "  [" << i << "] 0x" << std::hex << pseg->get_flags()
                  << "\t0x" << pseg->get_virtual_address() << "\t0x"
                  << pseg->get_file_size() << "\t0x" << pseg->get_memory_size()
                  << std::endl;
        // Access to segments's data
        // const char* p = reader.segments[i]->get_data()
    }

    for ( int i = 0; i < sec_num; ++i ) {
        section* psec = reader.sections[i];
        // Check section type
        if ( psec->get_type() == SHT_SYMTAB ) {
            const symbol_section_accessor symbols( reader, psec );
            for ( unsigned int j = 0; j < symbols.get_symbols_num(); ++j ) {
                std::string   name;
                Elf64_Addr    value;
                Elf_Xword     size;
                unsigned char bind;
                unsigned char type;
                Elf_Half      section_index;
                unsigned char other;

                // Read symbol properties
                symbols.get_symbol( j, name, value, size, bind, type,
                                    section_index, other );
                std::cout << j << " " << name << " " << value << std::endl;
            }
        }
    }

    return 0;
}