macho.rs - mozsearch

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use object::read::macho::MachHeader;

use object::read::{Object, ObjectSection};

use object::{macho, read, write, Architecture, BinaryFormat, Endianness};

// Test that segment size is valid when the first section needs alignment.

#[test]

fn issue_286_segment_file_size() {

    let mut object = write::Object::new(

        BinaryFormat::MachO,

        Architecture::X86_64,

        Endianness::Little,

);

    let text = object.section_id(write::StandardSection::Text);

    object.append_section_data(text, &[1; 30], 0x1000);

    let bytes = &*object.write().unwrap();

    let header = macho::MachHeader64::parse(bytes, 0).unwrap();

    let endian: Endianness = header.endian().unwrap();

    let mut commands = header.load_commands(endian, bytes, 0).unwrap();

    let command = commands.next().unwrap().unwrap();

    let (segment, _) = command.segment_64().unwrap().unwrap();

    assert_eq!(segment.vmsize.get(endian), 30);

    assert_eq!(segment.filesize.get(endian), 30);

// We were emitting section file alignment padding that didn't match the address alignment padding.

#[test]

fn issue_552_section_file_alignment() {

    let mut object = write::Object::new(

        BinaryFormat::MachO,

        Architecture::X86_64,

        Endianness::Little,

);

    // The starting file offset is not a multiple of 32 (checked later).

    // Length of 32 ensures that the file offset of the end of this section is still not a

    // multiple of 32.

    let section = object.add_section(vec![], vec![], object::SectionKind::ReadOnlyDataWithRel);

    object.append_section_data(section, &[0u8; 32], 1);

    // Address is already aligned correctly, so there must not any padding,

    // even though file offset is not aligned.

    let section = object.add_section(vec![], vec![], object::SectionKind::ReadOnlyData);

    object.append_section_data(section, &[0u8; 1], 32);

    let bytes = &*object.write().unwrap();

    //std::fs::write(&"align.o", &bytes).unwrap();

    let object = read::File::parse(bytes).unwrap();

    let mut sections = object.sections();

    let section = sections.next().unwrap();

    let offset = section.file_range().unwrap().0;

    // Check file offset is not aligned to 32.

    assert_ne!(offset % 32, 0);

    assert_eq!(section.address(), 0);

    assert_eq!(section.size(), 32);

    let section = sections.next().unwrap();

    // Check there is no padding.

    assert_eq!(section.file_range(), Some((offset + 32, 1)));

    assert_eq!(section.address(), 32);

    assert_eq!(section.size(), 1);