object 0.14.1

use std::collections::HashMap;
use std::{env, fs, process};

use object::{write, Object, ObjectSection, RelocationTarget, SectionKind, SymbolKind};

fn main() {
    let mut args = env::args();
    if args.len() != 3 {
        eprintln!("Usage: {} <infile> <outfile>", args.next().unwrap());
        process::exit(1);
    }

    args.next();
    let in_file_path = args.next().unwrap();
    let out_file_path = args.next().unwrap();

    let in_file = match fs::File::open(&in_file_path) {
        Ok(file) => file,
        Err(err) => {
            eprintln!("Failed to open file '{}': {}", in_file_path, err,);
            process::exit(1);
        }
    };
    let in_file = match unsafe { memmap::Mmap::map(&in_file) } {
        Ok(mmap) => mmap,
        Err(err) => {
            eprintln!("Failed to map file '{}': {}", in_file_path, err,);
            process::exit(1);
        }
    };
    let in_object = match object::File::parse(&*in_file) {
        Ok(object) => object,
        Err(err) => {
            eprintln!("Failed to parse file '{}': {}", in_file_path, err);
            process::exit(1);
        }
    };

    let mut out_object = write::Object::new(in_object.format(), in_object.architecture());
    out_object.mangling = write::Mangling::None;

    let mut out_sections = HashMap::new();
    for in_section in in_object.sections() {
        if in_section.kind() == SectionKind::Metadata {
            continue;
        }
        let section_id = out_object.add_section(
            in_section.segment_name().unwrap_or("").as_bytes().to_vec(),
            in_section.name().unwrap_or("").as_bytes().to_vec(),
            in_section.kind(),
        );
        let out_section = out_object.section_mut(section_id);
        if out_section.is_bss() {
            out_section.append_bss(in_section.size(), in_section.align());
        } else {
            out_section.set_data(in_section.uncompressed_data().into(), in_section.align());
        }
        out_sections.insert(in_section.index(), section_id);
    }

    let mut out_symbols = HashMap::new();
    for (symbol_index, in_symbol) in in_object.symbols() {
        if in_symbol.kind() == SymbolKind::Null {
            continue;
        }
        let (section, value) = match in_symbol.section_index() {
            Some(index) => (
                Some(*out_sections.get(&index).unwrap()),
                in_symbol.address() - in_object.section_by_index(index).unwrap().address(),
            ),
            None => (None, in_symbol.address()),
        };
        let out_symbol = write::Symbol {
            name: in_symbol.name().unwrap_or("").as_bytes().to_vec(),
            value,
            size: in_symbol.size(),
            kind: in_symbol.kind(),
            scope: in_symbol.scope(),
            weak: in_symbol.is_weak(),
            section,
        };
        let symbol_id = out_object.add_symbol(out_symbol);
        out_symbols.insert(symbol_index, symbol_id);
    }

    for in_section in in_object.sections() {
        if in_section.kind() == SectionKind::Metadata {
            continue;
        }
        let out_section = *out_sections.get(&in_section.index()).unwrap();
        for (offset, in_relocation) in in_section.relocations() {
            let symbol = match in_relocation.target() {
                RelocationTarget::Symbol(symbol) => *out_symbols.get(&symbol).unwrap(),
                RelocationTarget::Section(section) => {
                    out_object.section_symbol(*out_sections.get(&section).unwrap())
                }
            };
            let out_relocation = write::Relocation {
                offset,
                size: in_relocation.size(),
                kind: in_relocation.kind(),
                encoding: in_relocation.encoding(),
                symbol,
                addend: in_relocation.addend(),
            };
            out_object
                .add_relocation(out_section, out_relocation)
                .unwrap();
        }
    }

    let out_data = out_object.write().unwrap();
    if let Err(err) = fs::write(&out_file_path, out_data) {
        eprintln!("Failed to write file '{}': {}", out_file_path, err);
        process::exit(1);
    }
}