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LibObjectFile is a .NET library to read, manipulate and write linker and executable object files (e.g ELF, PE, DWARF, ar...)

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LibObjectFile ci NuGet

LibObjectFile is a .NET library to read, manipulate and write linker and executable object files (e.g ELF, ar, DWARF, PE...)

NOTE: Currently LibObjectFile supports the following file format:

  • PE image file format (Portable Executable / DLL)
  • ELF object-file format
  • DWARF debugging format (version 4)
  • Archive ar file format (Common, GNU and BSD variants)

There is a longer term plan to support other file formats (e.g COFF, MACH-O, .lib) but as I don't have a need for them right now, it is left as an exercise for PR contributors! ;)

Usage

// Reads an ELF file
using var inStream = File.OpenRead("helloworld");
var elf = ElfObjectFile.Read(inStream);
foreach(var section in elf.Sections)
{
    Console.WriteLine(section.Name);
}
// Print the content of the ELF as readelf output
elf.Print(Console.Out);
// Write the ElfObjectFile to another file on the disk
using var outStream = File.OpenWrite("helloworld2");
elf.Write(outStream);

Features

  • Full support of Archive ar file format including Common, GNU and BSD variants.
  • Full support for the PE file format
    • Read and write from/to a System.IO.Stream
    • All PE Directories are supported
    • PEFile.Relocate to relocate the image base of a PE file
    • PEFile.Print to print the content of a PE file to a textual representation
    • Support for calculating the checksum of a PE file
    • Good support for the ELF file format:
    • Read and write from/to a System.IO.Stream
    • Handling of LSB/MSB
    • Support the following sections:
      • String Table
      • Symbol Table
      • Relocation Table: supported I386, X86_64, ARM and AARCH64 relocations (others can be exposed by adding some mappings)
      • Note Table
      • Other sections fallback to ElfCustomSection
    • Program headers with or without sections
    • Print with readelf similar output
  • Support for DWARF debugging format:
    • Partial support of Version 4 (currently still the default for GCC)
    • Support for the sections: .debug_info, .debug_line, .debug_aranges, .debug_abbrev and .debug_str
    • Support for Dwarf expressions
    • High level interface, automatic layout/offsets between sections.
    • Integration with ELF to support easy reading/writing back
    • Support for relocatable sections
  • Use of a Diagnostics API to validate file format (on read/before write)
  • Library requiring net8.0
    • If you are looking for netstandard2.1 support you will need to use 0.4.0 version

Documentation

The doc/readme.md explains how the library is designed and can be used.

Download

LibObjectFile is available as a NuGet package: NuGet

Build

In order to build LibObjectFile, you need to have installed the .NET 8 SDK.

Running the tests require Ubuntu 22.04. dotnet test will work on Windows (via WSL) and on that version of Ubuntu. If you're using macOS or another Linux, there's a Dockerfile and a helper script under src to run tests in the right OS version.

License

This software is released under the BSD-Clause 2 license.

Author

Alexandre MUTEL aka xoofx

Supporters

Supports this project with a monthly donation and help me continue improving it. [Become a supporter]

bruno-garcia

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LibObjectFile is a .NET library to read, manipulate and write linker and executable object files (e.g ELF, PE, DWARF, ar...)

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