1 files changed, 303 insertions, 0 deletions
diff --git a/vendor/object/src/read/macho/segment.rs b/vendor/object/src/read/macho/segment.rs
new file mode 100644
index 0000000..c889ad2
--- /dev/null
+++ b/vendor/object/src/read/macho/segment.rs
@@ -0,0 +1,303 @@
+use core::fmt::Debug;
+use core::{result, slice, str};
+
+use crate::endian::{self, Endianness};
+use crate::macho;
+use crate::pod::Pod;
+use crate::read::{self, ObjectSegment, ReadError, ReadRef, Result, SegmentFlags};
+
+use super::{LoadCommandData, MachHeader, MachOFile, Section};
+
+/// An iterator for the segments in a [`MachOFile32`](super::MachOFile32).
+pub type MachOSegmentIterator32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSegmentIterator<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// An iterator for the segments in a [`MachOFile64`](super::MachOFile64).
+pub type MachOSegmentIterator64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSegmentIterator<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// An iterator for the segments in a [`MachOFile`].
+#[derive(Debug)]
+pub struct MachOSegmentIterator<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file MachOFile<'data, Mach, R>,
+    pub(super) iter: slice::Iter<'file, MachOSegmentInternal<'data, Mach, R>>,
+}
+
+impl<'data, 'file, Mach, R> Iterator for MachOSegmentIterator<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    type Item = MachOSegment<'data, 'file, Mach, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|internal| MachOSegment {
+            file: self.file,
+            internal,
+        })
+    }
+}
+
+/// A segment in a [`MachOFile32`](super::MachOFile32).
+pub type MachOSegment32<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSegment<'data, 'file, macho::MachHeader32<Endian>, R>;
+/// A segment in a [`MachOFile64`](super::MachOFile64).
+pub type MachOSegment64<'data, 'file, Endian = Endianness, R = &'data [u8]> =
+    MachOSegment<'data, 'file, macho::MachHeader64<Endian>, R>;
+
+/// A segment in a [`MachOFile`].
+///
+/// Most functionality is provided by the [`ObjectSegment`] trait implementation.
+#[derive(Debug)]
+pub struct MachOSegment<'data, 'file, Mach, R = &'data [u8]>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    file: &'file MachOFile<'data, Mach, R>,
+    internal: &'file MachOSegmentInternal<'data, Mach, R>,
+}
+
+impl<'data, 'file, Mach, R> MachOSegment<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    fn bytes(&self) -> Result<&'data [u8]> {
+        self.internal
+            .segment
+            .data(self.file.endian, self.file.data)
+            .read_error("Invalid Mach-O segment size or offset")
+    }
+}
+
+impl<'data, 'file, Mach, R> read::private::Sealed for MachOSegment<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Mach, R> ObjectSegment<'data> for MachOSegment<'data, 'file, Mach, R>
+where
+    Mach: MachHeader,
+    R: ReadRef<'data>,
+{
+    #[inline]
+    fn address(&self) -> u64 {
+        self.internal.segment.vmaddr(self.file.endian).into()
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        self.internal.segment.vmsize(self.file.endian).into()
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        // Page size.
+        0x1000
+    }
+
+    #[inline]
+    fn file_range(&self) -> (u64, u64) {
+        self.internal.segment.file_range(self.file.endian)
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        self.bytes()
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.bytes()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<Option<&[u8]>> {
+        Ok(Some(self.internal.segment.name()))
+    }
+
+    #[inline]
+    fn name(&self) -> Result<Option<&str>> {
+        Ok(Some(
+            str::from_utf8(self.internal.segment.name())
+                .ok()
+                .read_error("Non UTF-8 Mach-O segment name")?,
+        ))
+    }
+
+    #[inline]
+    fn flags(&self) -> SegmentFlags {
+        let flags = self.internal.segment.flags(self.file.endian);
+        let maxprot = self.internal.segment.maxprot(self.file.endian);
+        let initprot = self.internal.segment.initprot(self.file.endian);
+        SegmentFlags::MachO {
+            flags,
+            maxprot,
+            initprot,
+        }
+    }
+}
+
+#[derive(Debug, Clone, Copy)]
+pub(super) struct MachOSegmentInternal<'data, Mach: MachHeader, R: ReadRef<'data>> {
+    pub data: R,
+    pub segment: &'data Mach::Segment,
+}
+
+/// A trait for generic access to [`macho::SegmentCommand32`] and [`macho::SegmentCommand64`].
+#[allow(missing_docs)]
+pub trait Segment: Debug + Pod {
+    type Word: Into<u64>;
+    type Endian: endian::Endian;
+    type Section: Section<Endian = Self::Endian>;
+
+    fn from_command(command: LoadCommandData<'_, Self::Endian>) -> Result<Option<(&Self, &[u8])>>;
+
+    fn cmd(&self, endian: Self::Endian) -> u32;
+    fn cmdsize(&self, endian: Self::Endian) -> u32;
+    fn segname(&self) -> &[u8; 16];
+    fn vmaddr(&self, endian: Self::Endian) -> Self::Word;
+    fn vmsize(&self, endian: Self::Endian) -> Self::Word;
+    fn fileoff(&self, endian: Self::Endian) -> Self::Word;
+    fn filesize(&self, endian: Self::Endian) -> Self::Word;
+    fn maxprot(&self, endian: Self::Endian) -> u32;
+    fn initprot(&self, endian: Self::Endian) -> u32;
+    fn nsects(&self, endian: Self::Endian) -> u32;
+    fn flags(&self, endian: Self::Endian) -> u32;
+
+    /// Return the `segname` bytes up until the null terminator.
+    fn name(&self) -> &[u8] {
+        let segname = &self.segname()[..];
+        match memchr::memchr(b'\0', segname) {
+            Some(end) => &segname[..end],
+            None => segname,
+        }
+    }
+
+    /// Return the offset and size of the segment in the file.
+    fn file_range(&self, endian: Self::Endian) -> (u64, u64) {
+        (self.fileoff(endian).into(), self.filesize(endian).into())
+    }
+
+    /// Get the segment data from the file data.
+    ///
+    /// Returns `Err` for invalid values.
+    fn data<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        data: R,
+    ) -> result::Result<&'data [u8], ()> {
+        let (offset, size) = self.file_range(endian);
+        data.read_bytes_at(offset, size)
+    }
+
+    /// Get the array of sections from the data following the segment command.
+    ///
+    /// Returns `Err` for invalid values.
+    fn sections<'data, R: ReadRef<'data>>(
+        &self,
+        endian: Self::Endian,
+        section_data: R,
+    ) -> Result<&'data [Self::Section]> {
+        section_data
+            .read_slice_at(0, self.nsects(endian) as usize)
+            .read_error("Invalid Mach-O number of sections")
+    }
+}
+
+impl<Endian: endian::Endian> Segment for macho::SegmentCommand32<Endian> {
+    type Word = u32;
+    type Endian = Endian;
+    type Section = macho::Section32<Self::Endian>;
+
+    fn from_command(command: LoadCommandData<'_, Self::Endian>) -> Result<Option<(&Self, &[u8])>> {
+        command.segment_32()
+    }
+
+    fn cmd(&self, endian: Self::Endian) -> u32 {
+        self.cmd.get(endian)
+    }
+    fn cmdsize(&self, endian: Self::Endian) -> u32 {
+        self.cmdsize.get(endian)
+    }
+    fn segname(&self) -> &[u8; 16] {
+        &self.segname
+    }
+    fn vmaddr(&self, endian: Self::Endian) -> Self::Word {
+        self.vmaddr.get(endian)
+    }
+    fn vmsize(&self, endian: Self::Endian) -> Self::Word {
+        self.vmsize.get(endian)
+    }
+    fn fileoff(&self, endian: Self::Endian) -> Self::Word {
+        self.fileoff.get(endian)
+    }
+    fn filesize(&self, endian: Self::Endian) -> Self::Word {
+        self.filesize.get(endian)
+    }
+    fn maxprot(&self, endian: Self::Endian) -> u32 {
+        self.maxprot.get(endian)
+    }
+    fn initprot(&self, endian: Self::Endian) -> u32 {
+        self.initprot.get(endian)
+    }
+    fn nsects(&self, endian: Self::Endian) -> u32 {
+        self.nsects.get(endian)
+    }
+    fn flags(&self, endian: Self::Endian) -> u32 {
+        self.flags.get(endian)
+    }
+}
+
+impl<Endian: endian::Endian> Segment for macho::SegmentCommand64<Endian> {
+    type Word = u64;
+    type Endian = Endian;
+    type Section = macho::Section64<Self::Endian>;
+
+    fn from_command(command: LoadCommandData<'_, Self::Endian>) -> Result<Option<(&Self, &[u8])>> {
+        command.segment_64()
+    }
+
+    fn cmd(&self, endian: Self::Endian) -> u32 {
+        self.cmd.get(endian)
+    }
+    fn cmdsize(&self, endian: Self::Endian) -> u32 {
+        self.cmdsize.get(endian)
+    }
+    fn segname(&self) -> &[u8; 16] {
+        &self.segname
+    }
+    fn vmaddr(&self, endian: Self::Endian) -> Self::Word {
+        self.vmaddr.get(endian)
+    }
+    fn vmsize(&self, endian: Self::Endian) -> Self::Word {
+        self.vmsize.get(endian)
+    }
+    fn fileoff(&self, endian: Self::Endian) -> Self::Word {
+        self.fileoff.get(endian)
+    }
+    fn filesize(&self, endian: Self::Endian) -> Self::Word {
+        self.filesize.get(endian)
+    }
+    fn maxprot(&self, endian: Self::Endian) -> u32 {
+        self.maxprot.get(endian)
+    }
+    fn initprot(&self, endian: Self::Endian) -> u32 {
+        self.initprot.get(endian)
+    }
+    fn nsects(&self, endian: Self::Endian) -> u32 {
+        self.nsects.get(endian)
+    }
+    fn flags(&self, endian: Self::Endian) -> u32 {
+        self.flags.get(endian)
+    }
+}