Vendor things

third-party/vendor/object/src/read/macho/file.rs

@@ -0,0 +1,781 @@
+use alloc::vec::Vec;
+use core::fmt::Debug;
+use core::{mem, str};
+
+use crate::read::{
+    self, Architecture, ComdatKind, Error, Export, FileFlags, Import, NoDynamicRelocationIterator,
+    Object, ObjectComdat, ObjectKind, ObjectMap, ObjectSection, ReadError, ReadRef, Result,
+    SectionIndex, SubArchitecture, SymbolIndex,
+};
+use crate::{endian, macho, BigEndian, ByteString, Endian, Endianness, Pod};
+
+use super::{
+    DyldCacheImage, LoadCommandIterator, MachOSection, MachOSectionInternal, MachOSectionIterator,
+    MachOSegment, MachOSegmentInternal, MachOSegmentIterator, MachOSymbol, MachOSymbolIterator,
+    MachOSymbolTable, Nlist, Section, Segment, SymbolTable,
+};
+
+/// A 32-bit Mach-O object file.
+///
+/// This is a file that starts with [`macho::MachHeader32`], and corresponds
+/// to [`crate::FileKind::MachO32`].
+pub type MachOFile32<'data, Endian = Endianness, R = &'data [u8]> =
+    MachOFile<'data, macho::MachHeader32<Endian>, R>;
+/// A 64-bit Mach-O object file.
+///
+/// This is a file that starts with [`macho::MachHeader64`], and corresponds
+/// to [`crate::FileKind::MachO64`].
+pub type MachOFile64<'data, Endian = Endianness, R = &'data [u8]> =
+    MachOFile<'data, macho::MachHeader64<Endian>, R>;
+
+/// A partially parsed Mach-O file.
+///
+/// Most of the functionality of this type is provided by the [`Object`] trait implementation.
+#[derive(Debug)]
+pub struct MachOFile<'data, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) endian: Mach::Endian,
+    pub(super) data: R,
+    pub(super) header_offset: u64,
+    pub(super) header: &'data Mach,
+    pub(super) segments: Vec<MachOSegmentInternal<'data, Mach, R>>,
+    pub(super) sections: Vec<MachOSectionInternal<'data, Mach>>,
+    pub(super) symbols: SymbolTable<'data, Mach, R>,
+}
+
+impl<'data, Mach, R> MachOFile<'data, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    /// Parse the raw Mach-O file data.
+    pub fn parse(data: R) -> Result<Self> {
+        let header = Mach::parse(data, 0)?;
+        let endian = header.endian()?;
+
+        // Build a list of segments and sections to make some operations more efficient.
+        let mut segments = Vec::new();
+        let mut sections = Vec::new();
+        let mut symbols = SymbolTable::default();
+        if let Ok(mut commands) = header.load_commands(endian, data, 0) {
+            while let Ok(Some(command)) = commands.next() {
+                if let Some((segment, section_data)) = Mach::Segment::from_command(command)? {
+                    let segment_index = segments.len();
+                    segments.push(MachOSegmentInternal { segment, data });
+                    for section in segment.sections(endian, section_data)? {
+                        let index = SectionIndex(sections.len() + 1);
+                        sections.push(MachOSectionInternal::parse(index, segment_index, section));
+                    }
+                } else if let Some(symtab) = command.symtab()? {
+                    symbols = symtab.symbols(endian, data)?;
+                }
+            }
+        }
+
+        Ok(MachOFile {
+            endian,
+            data,
+            header_offset: 0,
+            header,
+            segments,
+            sections,
+            symbols,
+        })
+    }
+
+    /// Parse the Mach-O file for the given image from the dyld shared cache.
+    /// This will read different sections from different subcaches, if necessary.
+    pub fn parse_dyld_cache_image<'cache, E: Endian>(
+        image: &DyldCacheImage<'data, 'cache, E, R>,
+    ) -> Result<Self> {
+        let (data, header_offset) = image.image_data_and_offset()?;
+        let header = Mach::parse(data, header_offset)?;
+        let endian = header.endian()?;
+
+        // Build a list of sections to make some operations more efficient.
+        // Also build a list of segments, because we need to remember which ReadRef
+        // to read each section's data from. Only the DyldCache knows this information,
+        // and we won't have access to it once we've exited this function.
+        let mut segments = Vec::new();
+        let mut sections = Vec::new();
+        let mut linkedit_data: Option<R> = None;
+        let mut symtab = None;
+        if let Ok(mut commands) = header.load_commands(endian, data, header_offset) {
+            while let Ok(Some(command)) = commands.next() {
+                if let Some((segment, section_data)) = Mach::Segment::from_command(command)? {
+                    // Each segment can be stored in a different subcache. Get the segment's
+                    // address and look it up in the cache mappings, to find the correct cache data.
+                    let addr = segment.vmaddr(endian).into();
+                    let (data, _offset) = image
+                        .cache
+                        .data_and_offset_for_address(addr)
+                        .read_error("Could not find segment data in dyld shared cache")?;
+                    if segment.name() == macho::SEG_LINKEDIT.as_bytes() {
+                        linkedit_data = Some(data);
+                    }
+                    let segment_index = segments.len();
+                    segments.push(MachOSegmentInternal { segment, data });
+
+                    for section in segment.sections(endian, section_data)? {
+                        let index = SectionIndex(sections.len() + 1);
+                        sections.push(MachOSectionInternal::parse(index, segment_index, section));
+                    }
+                } else if let Some(st) = command.symtab()? {
+                    symtab = Some(st);
+                }
+            }
+        }
+
+        // The symbols are found in the __LINKEDIT segment, so make sure to read them from the
+        // correct subcache.
+        let symbols = match (symtab, linkedit_data) {
+            (Some(symtab), Some(linkedit_data)) => symtab.symbols(endian, linkedit_data)?,
+            _ => SymbolTable::default(),
+        };
+
+        Ok(MachOFile {
+            endian,
+            data,
+            header_offset,
+            header,
+            segments,
+            sections,
+            symbols,
+        })
+    }
+
+    /// Return the section at the given index.
+    #[inline]
+    pub(super) fn section_internal(
+        &self,
+        index: SectionIndex,
+    ) -> Result<&MachOSectionInternal<'data, Mach>> {
+        index
+            .0
+            .checked_sub(1)
+            .and_then(|index| self.sections.get(index))
+            .read_error("Invalid Mach-O section index")
+    }
+
+    pub(super) fn segment_internal(
+        &self,
+        index: usize,
+    ) -> Result<&MachOSegmentInternal<'data, Mach, R>> {
+        self.segments
+            .get(index)
+            .read_error("Invalid Mach-O segment index")
+    }
+
+    /// Returns the endianness.
+    pub fn endian(&self) -> Mach::Endian {
+        self.endian
+    }
+
+    /// Returns the raw data.
+    pub fn data(&self) -> R {
+        self.data
+    }
+
+    /// Returns the raw Mach-O file header.
+    pub fn raw_header(&self) -> &'data Mach {
+        self.header
+    }
+
+    /// Return the `LC_BUILD_VERSION` load command if present.
+    pub fn build_version(&self) -> Result<Option<&'data macho::BuildVersionCommand<Mach::Endian>>> {
+        let mut commands = self
+            .header
+            .load_commands(self.endian, self.data, self.header_offset)?;
+        while let Some(command) = commands.next()? {
+            if let Some(build_version) = command.build_version()? {
+                return Ok(Some(build_version));
+            }
+        }
+        Ok(None)
+    }
+}
+
+impl<'data, Mach, R> read::private::Sealed for MachOFile<'data, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Mach, R> Object<'data, 'file> for MachOFile<'data, Mach, R>
+where
+    'data: 'file,
+    Mach: MachHeader,
+    R: 'file + ReadRef<'data>,
+{
+    type Segment = MachOSegment<'data, 'file, Mach, R>;
+    type SegmentIterator = MachOSegmentIterator<'data, 'file, Mach, R>;
+    type Section = MachOSection<'data, 'file, Mach, R>;
+    type SectionIterator = MachOSectionIterator<'data, 'file, Mach, R>;
+    type Comdat = MachOComdat<'data, 'file, Mach, R>;
+    type ComdatIterator = MachOComdatIterator<'data, 'file, Mach, R>;
+    type Symbol = MachOSymbol<'data, 'file, Mach, R>;
+    type SymbolIterator = MachOSymbolIterator<'data, 'file, Mach, R>;
+    type SymbolTable = MachOSymbolTable<'data, 'file, Mach, R>;
+    type DynamicRelocationIterator = NoDynamicRelocationIterator;
+
+    fn architecture(&self) -> Architecture {
+        match self.header.cputype(self.endian) {
+            macho::CPU_TYPE_ARM => Architecture::Arm,
+            macho::CPU_TYPE_ARM64 => Architecture::Aarch64,
+            macho::CPU_TYPE_ARM64_32 => Architecture::Aarch64_Ilp32,
+            macho::CPU_TYPE_X86 => Architecture::I386,
+            macho::CPU_TYPE_X86_64 => Architecture::X86_64,
+            macho::CPU_TYPE_MIPS => Architecture::Mips,
+            macho::CPU_TYPE_POWERPC => Architecture::PowerPc,
+            macho::CPU_TYPE_POWERPC64 => Architecture::PowerPc64,
+            _ => Architecture::Unknown,
+        }
+    }
+
+    fn sub_architecture(&self) -> Option<SubArchitecture> {
+        match (
+            self.header.cputype(self.endian),
+            self.header.cpusubtype(self.endian),
+        ) {
+            (macho::CPU_TYPE_ARM64, macho::CPU_SUBTYPE_ARM64E) => Some(SubArchitecture::Arm64E),
+            _ => None,
+        }
+    }
+
+    #[inline]
+    fn is_little_endian(&self) -> bool {
+        self.header.is_little_endian()
+    }
+
+    #[inline]
+    fn is_64(&self) -> bool {
+        self.header.is_type_64()
+    }
+
+    fn kind(&self) -> ObjectKind {
+        match self.header.filetype(self.endian) {
+            macho::MH_OBJECT => ObjectKind::Relocatable,
+            macho::MH_EXECUTE => ObjectKind::Executable,
+            macho::MH_CORE => ObjectKind::Core,
+            macho::MH_DYLIB => ObjectKind::Dynamic,
+            _ => ObjectKind::Unknown,
+        }
+    }
+
+    fn segments(&'file self) -> MachOSegmentIterator<'data, 'file, Mach, R> {
+        MachOSegmentIterator {
+            file: self,
+            iter: self.segments.iter(),
+        }
+    }
+
+    fn section_by_name_bytes(
+        &'file self,
+        section_name: &[u8],
+    ) -> Option<MachOSection<'data, 'file, Mach, R>> {
+        // Translate the "." prefix to the "__" prefix used by OSX/Mach-O, eg
+        // ".debug_info" to "__debug_info", and limit to 16 bytes total.
+        let system_name = if section_name.starts_with(b".") {
+            if section_name.len() > 15 {
+                Some(&section_name[1..15])
+            } else {
+                Some(&section_name[1..])
+            }
+        } else {
+            None
+        };
+        let cmp_section_name = |section: &MachOSection<'data, 'file, Mach, R>| {
+            section
+                .name_bytes()
+                .map(|name| {
+                    section_name == name
+                        || system_name
+                            .filter(|system_name| {
+                                name.starts_with(b"__") && name[2..] == **system_name
+                            })
+                            .is_some()
+                })
+                .unwrap_or(false)
+        };
+
+        self.sections().find(cmp_section_name)
+    }
+
+    fn section_by_index(
+        &'file self,
+        index: SectionIndex,
+    ) -> Result<MachOSection<'data, 'file, Mach, R>> {
+        let internal = *self.section_internal(index)?;
+        Ok(MachOSection {
+            file: self,
+            internal,
+        })
+    }
+
+    fn sections(&'file self) -> MachOSectionIterator<'data, 'file, Mach, R> {
+        MachOSectionIterator {
+            file: self,
+            iter: self.sections.iter(),
+        }
+    }
+
+    fn comdats(&'file self) -> MachOComdatIterator<'data, 'file, Mach, R> {
+        MachOComdatIterator { file: self }
+    }
+
+    fn symbol_by_index(
+        &'file self,
+        index: SymbolIndex,
+    ) -> Result<MachOSymbol<'data, 'file, Mach, R>> {
+        let nlist = self.symbols.symbol(index.0)?;
+        MachOSymbol::new(self, index, nlist).read_error("Unsupported Mach-O symbol index")
+    }
+
+    fn symbols(&'file self) -> MachOSymbolIterator<'data, 'file, Mach, R> {
+        MachOSymbolIterator {
+            file: self,
+            index: 0,
+        }
+    }
+
+    #[inline]
+    fn symbol_table(&'file self) -> Option<MachOSymbolTable<'data, 'file, Mach, R>> {
+        Some(MachOSymbolTable { file: self })
+    }
+
+    fn dynamic_symbols(&'file self) -> MachOSymbolIterator<'data, 'file, Mach, R> {
+        MachOSymbolIterator {
+            file: self,
+            index: self.symbols.len(),
+        }
+    }
+
+    #[inline]
+    fn dynamic_symbol_table(&'file self) -> Option<MachOSymbolTable<'data, 'file, Mach, R>> {
+        None
+    }
+
+    fn object_map(&'file self) -> ObjectMap<'data> {
+        self.symbols.object_map(self.endian)
+    }
+
+    fn imports(&self) -> Result<Vec<Import<'data>>> {
+        let mut dysymtab = None;
+        let mut libraries = Vec::new();
+        let twolevel = self.header.flags(self.endian) & macho::MH_TWOLEVEL != 0;
+        if twolevel {
+            libraries.push(&[][..]);
+        }
+        let mut commands = self
+            .header
+            .load_commands(self.endian, self.data, self.header_offset)?;
+        while let Some(command) = commands.next()? {
+            if let Some(command) = command.dysymtab()? {
+                dysymtab = Some(command);
+            }
+            if twolevel {
+                if let Some(dylib) = command.dylib()? {
+                    libraries.push(command.string(self.endian, dylib.dylib.name)?);
+                }
+            }
+        }
+
+        let mut imports = Vec::new();
+        if let Some(dysymtab) = dysymtab {
+            let index = dysymtab.iundefsym.get(self.endian) as usize;
+            let number = dysymtab.nundefsym.get(self.endian) as usize;
+            for i in index..(index.wrapping_add(number)) {
+                let symbol = self.symbols.symbol(i)?;
+                let name = symbol.name(self.endian, self.symbols.strings())?;
+                let library = if twolevel {
+                    libraries
+                        .get(symbol.library_ordinal(self.endian) as usize)
+                        .copied()
+                        .read_error("Invalid Mach-O symbol library ordinal")?
+                } else {
+                    &[]
+                };
+                imports.push(Import {
+                    name: ByteString(name),
+                    library: ByteString(library),
+                });
+            }
+        }
+        Ok(imports)
+    }
+
+    fn exports(&self) -> Result<Vec<Export<'data>>> {
+        let mut dysymtab = None;
+        let mut commands = self
+            .header
+            .load_commands(self.endian, self.data, self.header_offset)?;
+        while let Some(command) = commands.next()? {
+            if let Some(command) = command.dysymtab()? {
+                dysymtab = Some(command);
+                break;
+            }
+        }
+
+        let mut exports = Vec::new();
+        if let Some(dysymtab) = dysymtab {
+            let index = dysymtab.iextdefsym.get(self.endian) as usize;
+            let number = dysymtab.nextdefsym.get(self.endian) as usize;
+            for i in index..(index.wrapping_add(number)) {
+                let symbol = self.symbols.symbol(i)?;
+                let name = symbol.name(self.endian, self.symbols.strings())?;
+                let address = symbol.n_value(self.endian).into();
+                exports.push(Export {
+                    name: ByteString(name),
+                    address,
+                });
+            }
+        }
+        Ok(exports)
+    }
+
+    #[inline]
+    fn dynamic_relocations(&'file self) -> Option<NoDynamicRelocationIterator> {
+        None
+    }
+
+    fn has_debug_symbols(&self) -> bool {
+        self.section_by_name(".debug_info").is_some()
+    }
+
+    fn mach_uuid(&self) -> Result<Option<[u8; 16]>> {
+        self.header.uuid(self.endian, self.data, self.header_offset)
+    }
+
+    fn relative_address_base(&self) -> u64 {
+        0
+    }
+
+    fn entry(&self) -> u64 {
+        if let Ok(mut commands) =
+            self.header
+                .load_commands(self.endian, self.data, self.header_offset)
+        {
+            while let Ok(Some(command)) = commands.next() {
+                if let Ok(Some(command)) = command.entry_point() {
+                    return command.entryoff.get(self.endian);
+                }
+            }
+        }
+        0
+    }
+
+    fn flags(&self) -> FileFlags {
+        FileFlags::MachO {
+            flags: self.header.flags(self.endian),
+        }
+    }
+}
+
+/// An iterator for the COMDAT section groups in a [`MachOFile64`].
+pub type MachOComdatIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdatIterator<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// An iterator for the COMDAT section groups in a [`MachOFile64`].
+pub type MachOComdatIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdatIterator<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// An iterator for the COMDAT section groups in a [`MachOFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct MachOComdatIterator<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    file: &'file MachOFile<'data, Mach, R>,
+}
+
+impl<'data, 'file, Mach, R> Iterator for MachOComdatIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type Item = MachOComdat<'data, 'file, Mach, R>;
+
+    #[inline]
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A COMDAT section group in a [`MachOFile32`].
+pub type MachOComdat32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdat<'data, 'file, macho::MachHeader32<Endian>, R>;
+
+/// A COMDAT section group in a [`MachOFile64`].
+pub type MachOComdat64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdat<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// A COMDAT section group in a [`MachOFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct MachOComdat<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    file: &'file MachOFile<'data, Mach, R>,
+}
+
+impl<'data, 'file, Mach, R> read::private::Sealed for MachOComdat<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Mach, R> ObjectComdat<'data> for MachOComdat<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type SectionIterator = MachOComdatSectionIterator<'data, 'file, Mach, R>;
+
+    #[inline]
+    fn kind(&self) -> ComdatKind {
+        unreachable!();
+    }
+
+    #[inline]
+    fn symbol(&self) -> SymbolIndex {
+        unreachable!();
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        unreachable!();
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        unreachable!();
+    }
+
+    #[inline]
+    fn sections(&self) -> Self::SectionIterator {
+        unreachable!();
+    }
+}
+
+/// An iterator for the sections in a COMDAT section group in a [`MachOFile32`].
+pub type MachOComdatSectionIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdatSectionIterator<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// An iterator for the sections in a COMDAT section group in a [`MachOFile64`].
+pub type MachOComdatSectionIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOComdatSectionIterator<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// An iterator for the sections in a COMDAT section group in a [`MachOFile`].
+///
+/// This is a stub that doesn't implement any functionality.
+#[derive(Debug)]
+pub struct MachOComdatSectionIterator<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    #[allow(unused)]
+    file: &'file MachOFile<'data, Mach, R>,
+}
+
+impl<'data, 'file, Mach, R> Iterator for MachOComdatSectionIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type Item = SectionIndex;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}
+
+/// A trait for generic access to [`macho::MachHeader32`] and [`macho::MachHeader64`].
+#[allow(missing_docs)]
+pub trait MachHeader: Debug + Pod {
+    type Word: Into<u64>;
+    type Endian: endian::Endian;
+    type Segment: Segment<Endian = Self::Endian, Section = Self::Section>;
+    type Section: Section<Endian = Self::Endian>;
+    type Nlist: Nlist<Endian = Self::Endian>;
+
+    /// Return true if this type is a 64-bit header.
+    ///
+    /// This is a property of the type, not a value in the header data.
+    fn is_type_64(&self) -> bool;
+
+    /// Return true if the `magic` field signifies big-endian.
+    fn is_big_endian(&self) -> bool;
+
+    /// Return true if the `magic` field signifies little-endian.
+    fn is_little_endian(&self) -> bool;
+
+    fn magic(&self) -> u32;
+    fn cputype(&self, endian: Self::Endian) -> u32;
+    fn cpusubtype(&self, endian: Self::Endian) -> u32;
+    fn filetype(&self, endian: Self::Endian) -> u32;
+    fn ncmds(&self, endian: Self::Endian) -> u32;
+    fn sizeofcmds(&self, endian: Self::Endian) -> u32;
+    fn flags(&self, endian: Self::Endian) -> u32;
+
+    // Provided methods.
+
+    /// Read the file header.
+    ///
+    /// Also checks that the magic field in the file header is a supported format.
+    fn parse<'data, R: ReadRef<'data>>(data: R, offset: u64) -> read::Result<&'data Self> {
+        let header = data
+            .read_at::<Self>(offset)
+            .read_error("Invalid Mach-O header size or alignment")?;
+        if !header.is_supported() {
+            return Err(Error("Unsupported Mach-O header"));
+        }
+        Ok(header)
+    }
+
+    fn is_supported(&self) -> bool {
+        self.is_little_endian() || self.is_big_endian()
+    }
+
+    fn endian(&self) -> Result<Self::Endian> {
+        Self::Endian::from_big_endian(self.is_big_endian()).read_error("Unsupported Mach-O endian")
+    }
+
+    fn load_commands<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+        header_offset: u64,
+    ) -> Result<LoadCommandIterator<'data, Self::Endian>> {
+        let data = data
+            .read_bytes_at(
+                header_offset + mem::size_of::<Self>() as u64,
+                self.sizeofcmds(endian).into(),
+            )
+            .read_error("Invalid Mach-O load command table size")?;
+        Ok(LoadCommandIterator::new(endian, data, self.ncmds(endian)))
+    }
+
+    /// Return the UUID from the `LC_UUID` load command, if one is present.
+    fn uuid<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+        header_offset: u64,
+    ) -> Result<Option<[u8; 16]>> {
+        let mut commands = self.load_commands(endian, data, header_offset)?;
+        while let Some(command) = commands.next()? {
+            if let Ok(Some(uuid)) = command.uuid() {
+                return Ok(Some(uuid.uuid));
+            }
+        }
+        Ok(None)
+    }
+}
+
+impl<Endian: endian::Endian> MachHeader for macho::MachHeader32<Endian> {
+    type Word = u32;
+    type Endian = Endian;
+    type Segment = macho::SegmentCommand32<Endian>;
+    type Section = macho::Section32<Endian>;
+    type Nlist = macho::Nlist32<Endian>;
+
+    fn is_type_64(&self) -> bool {
+        false
+    }
+
+    fn is_big_endian(&self) -> bool {
+        self.magic() == macho::MH_MAGIC
+    }
+
+    fn is_little_endian(&self) -> bool {
+        self.magic() == macho::MH_CIGAM
+    }
+
+    fn magic(&self) -> u32 {
+        self.magic.get(BigEndian)
+    }
+
+    fn cputype(&self, endian: Self::Endian) -> u32 {
+        self.cputype.get(endian)
+    }
+
+    fn cpusubtype(&self, endian: Self::Endian) -> u32 {
+        self.cpusubtype.get(endian)
+    }
+
+    fn filetype(&self, endian: Self::Endian) -> u32 {
+        self.filetype.get(endian)
+    }
+
+    fn ncmds(&self, endian: Self::Endian) -> u32 {
+        self.ncmds.get(endian)
+    }
+
+    fn sizeofcmds(&self, endian: Self::Endian) -> u32 {
+        self.sizeofcmds.get(endian)
+    }
+
+    fn flags(&self, endian: Self::Endian) -> u32 {
+        self.flags.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> MachHeader for macho::MachHeader64<Endian> {
+    type Word = u64;
+    type Endian = Endian;
+    type Segment = macho::SegmentCommand64<Endian>;
+    type Section = macho::Section64<Endian>;
+    type Nlist = macho::Nlist64<Endian>;
+
+    fn is_type_64(&self) -> bool {
+        true
+    }
+
+    fn is_big_endian(&self) -> bool {
+        self.magic() == macho::MH_MAGIC_64
+    }
+
+    fn is_little_endian(&self) -> bool {
+        self.magic() == macho::MH_CIGAM_64
+    }
+
+    fn magic(&self) -> u32 {
+        self.magic.get(BigEndian)
+    }
+
+    fn cputype(&self, endian: Self::Endian) -> u32 {
+        self.cputype.get(endian)
+    }
+
+    fn cpusubtype(&self, endian: Self::Endian) -> u32 {
+        self.cpusubtype.get(endian)
+    }
+
+    fn filetype(&self, endian: Self::Endian) -> u32 {
+        self.filetype.get(endian)
+    }
+
+    fn ncmds(&self, endian: Self::Endian) -> u32 {
+        self.ncmds.get(endian)
+    }
+
+    fn sizeofcmds(&self, endian: Self::Endian) -> u32 {
+        self.sizeofcmds.get(endian)
+    }
+
+    fn flags(&self, endian: Self::Endian) -> u32 {
+        self.flags.get(endian)
+    }
+}