1 files changed, 436 insertions, 0 deletions
diff --git a/third_party/rust/object/src/read/pe/section.rs b/third_party/rust/object/src/read/pe/section.rs
new file mode 100644
index 0000000000..439d42dac1
--- /dev/null
+++ b/third_party/rust/object/src/read/pe/section.rs
@@ -0,0 +1,436 @@
+use core::marker::PhantomData;
+use core::{cmp, iter, slice, str};
+
+use crate::endian::LittleEndian as LE;
+use crate::pe;
+use crate::pe::ImageSectionHeader;
+use crate::read::{
+    self, CompressedData, CompressedFileRange, ObjectSection, ObjectSegment, ReadError, ReadRef,
+    Relocation, Result, SectionFlags, SectionIndex, SectionKind, SegmentFlags,
+};
+
+use super::{ImageNtHeaders, PeFile, SectionTable};
+
+/// An iterator over the loadable sections of a `PeFile32`.
+pub type PeSegmentIterator32<'data, 'file, R = &'data [u8]> =
+    PeSegmentIterator<'data, 'file, pe::ImageNtHeaders32, R>;
+/// An iterator over the loadable sections of a `PeFile64`.
+pub type PeSegmentIterator64<'data, 'file, R = &'data [u8]> =
+    PeSegmentIterator<'data, 'file, pe::ImageNtHeaders64, R>;
+
+/// An iterator over the loadable sections of a `PeFile`.
+#[derive(Debug)]
+pub struct PeSegmentIterator<'data, 'file, Pe, R = &'data [u8]>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file PeFile<'data, Pe, R>,
+    pub(super) iter: slice::Iter<'data, pe::ImageSectionHeader>,
+}
+
+impl<'data, 'file, Pe, R> Iterator for PeSegmentIterator<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    type Item = PeSegment<'data, 'file, Pe, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|section| PeSegment {
+            file: self.file,
+            section,
+        })
+    }
+}
+
+/// A loadable section of a `PeFile32`.
+pub type PeSegment32<'data, 'file, R = &'data [u8]> =
+    PeSegment<'data, 'file, pe::ImageNtHeaders32, R>;
+/// A loadable section of a `PeFile64`.
+pub type PeSegment64<'data, 'file, R = &'data [u8]> =
+    PeSegment<'data, 'file, pe::ImageNtHeaders64, R>;
+
+/// A loadable section of a `PeFile`.
+#[derive(Debug)]
+pub struct PeSegment<'data, 'file, Pe, R = &'data [u8]>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    file: &'file PeFile<'data, Pe, R>,
+    section: &'data pe::ImageSectionHeader,
+}
+
+impl<'data, 'file, Pe, R> read::private::Sealed for PeSegment<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Pe, R> ObjectSegment<'data> for PeSegment<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    #[inline]
+    fn address(&self) -> u64 {
+        u64::from(self.section.virtual_address.get(LE)).wrapping_add(self.file.common.image_base)
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        u64::from(self.section.virtual_size.get(LE))
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        self.file.section_alignment()
+    }
+
+    #[inline]
+    fn file_range(&self) -> (u64, u64) {
+        let (offset, size) = self.section.pe_file_range();
+        (u64::from(offset), u64::from(size))
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        self.section.pe_data(self.file.data)
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.data()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<Option<&[u8]>> {
+        self.section
+            .name(self.file.common.symbols.strings())
+            .map(Some)
+    }
+
+    #[inline]
+    fn name(&self) -> Result<Option<&str>> {
+        let name = self.section.name(self.file.common.symbols.strings())?;
+        Ok(Some(
+            str::from_utf8(name)
+                .ok()
+                .read_error("Non UTF-8 PE section name")?,
+        ))
+    }
+
+    #[inline]
+    fn flags(&self) -> SegmentFlags {
+        let characteristics = self.section.characteristics.get(LE);
+        SegmentFlags::Coff { characteristics }
+    }
+}
+
+/// An iterator over the sections of a `PeFile32`.
+pub type PeSectionIterator32<'data, 'file, R = &'data [u8]> =
+    PeSectionIterator<'data, 'file, pe::ImageNtHeaders32, R>;
+/// An iterator over the sections of a `PeFile64`.
+pub type PeSectionIterator64<'data, 'file, R = &'data [u8]> =
+    PeSectionIterator<'data, 'file, pe::ImageNtHeaders64, R>;
+
+/// An iterator over the sections of a `PeFile`.
+#[derive(Debug)]
+pub struct PeSectionIterator<'data, 'file, Pe, R = &'data [u8]>
+where
+    'data: 'file,
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file PeFile<'data, Pe, R>,
+    pub(super) iter: iter::Enumerate<slice::Iter<'data, pe::ImageSectionHeader>>,
+}
+
+impl<'data, 'file, Pe, R> Iterator for PeSectionIterator<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    type Item = PeSection<'data, 'file, Pe, R>;
+
+    fn next(&mut self) -> Option<Self::Item> {
+        self.iter.next().map(|(index, section)| PeSection {
+            file: self.file,
+            index: SectionIndex(index + 1),
+            section,
+        })
+    }
+}
+
+/// A section of a `PeFile32`.
+pub type PeSection32<'data, 'file, R = &'data [u8]> =
+    PeSection<'data, 'file, pe::ImageNtHeaders32, R>;
+/// A section of a `PeFile64`.
+pub type PeSection64<'data, 'file, R = &'data [u8]> =
+    PeSection<'data, 'file, pe::ImageNtHeaders64, R>;
+
+/// A section of a `PeFile`.
+#[derive(Debug)]
+pub struct PeSection<'data, 'file, Pe, R = &'data [u8]>
+where
+    'data: 'file,
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    pub(super) file: &'file PeFile<'data, Pe, R>,
+    pub(super) index: SectionIndex,
+    pub(super) section: &'data pe::ImageSectionHeader,
+}
+
+impl<'data, 'file, Pe, R> read::private::Sealed for PeSection<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+}
+
+impl<'data, 'file, Pe, R> ObjectSection<'data> for PeSection<'data, 'file, Pe, R>
+where
+    Pe: ImageNtHeaders,
+    R: ReadRef<'data>,
+{
+    type RelocationIterator = PeRelocationIterator<'data, 'file, R>;
+
+    #[inline]
+    fn index(&self) -> SectionIndex {
+        self.index
+    }
+
+    #[inline]
+    fn address(&self) -> u64 {
+        u64::from(self.section.virtual_address.get(LE)).wrapping_add(self.file.common.image_base)
+    }
+
+    #[inline]
+    fn size(&self) -> u64 {
+        u64::from(self.section.virtual_size.get(LE))
+    }
+
+    #[inline]
+    fn align(&self) -> u64 {
+        self.file.section_alignment()
+    }
+
+    #[inline]
+    fn file_range(&self) -> Option<(u64, u64)> {
+        let (offset, size) = self.section.pe_file_range();
+        if size == 0 {
+            None
+        } else {
+            Some((u64::from(offset), u64::from(size)))
+        }
+    }
+
+    fn data(&self) -> Result<&'data [u8]> {
+        self.section.pe_data(self.file.data)
+    }
+
+    fn data_range(&self, address: u64, size: u64) -> Result<Option<&'data [u8]>> {
+        Ok(read::util::data_range(
+            self.data()?,
+            self.address(),
+            address,
+            size,
+        ))
+    }
+
+    #[inline]
+    fn compressed_file_range(&self) -> Result<CompressedFileRange> {
+        Ok(CompressedFileRange::none(self.file_range()))
+    }
+
+    #[inline]
+    fn compressed_data(&self) -> Result<CompressedData<'data>> {
+        self.data().map(CompressedData::none)
+    }
+
+    #[inline]
+    fn name_bytes(&self) -> Result<&[u8]> {
+        self.section.name(self.file.common.symbols.strings())
+    }
+
+    #[inline]
+    fn name(&self) -> Result<&str> {
+        let name = self.name_bytes()?;
+        str::from_utf8(name)
+            .ok()
+            .read_error("Non UTF-8 PE section name")
+    }
+
+    #[inline]
+    fn segment_name_bytes(&self) -> Result<Option<&[u8]>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn segment_name(&self) -> Result<Option<&str>> {
+        Ok(None)
+    }
+
+    #[inline]
+    fn kind(&self) -> SectionKind {
+        self.section.kind()
+    }
+
+    fn relocations(&self) -> PeRelocationIterator<'data, 'file, R> {
+        PeRelocationIterator(PhantomData)
+    }
+
+    fn flags(&self) -> SectionFlags {
+        SectionFlags::Coff {
+            characteristics: self.section.characteristics.get(LE),
+        }
+    }
+}
+
+impl<'data> SectionTable<'data> {
+    /// Return the file offset of the given virtual address, and the size up
+    /// to the end of the section containing it.
+    ///
+    /// Returns `None` if no section contains the address.
+    pub fn pe_file_range_at(&self, va: u32) -> Option<(u32, u32)> {
+        self.iter().find_map(|section| section.pe_file_range_at(va))
+    }
+
+    /// Return the data starting at the given virtual address, up to the end of the
+    /// section containing it.
+    ///
+    /// Ignores sections with invalid data.
+    ///
+    /// Returns `None` if no section contains the address.
+    pub fn pe_data_at<R: ReadRef<'data>>(&self, data: R, va: u32) -> Option<&'data [u8]> {
+        self.iter().find_map(|section| section.pe_data_at(data, va))
+    }
+
+    /// Return the data of the section that contains the given virtual address in a PE file.
+    ///
+    /// Also returns the virtual address of that section.
+    ///
+    /// Ignores sections with invalid data.
+    pub fn pe_data_containing<R: ReadRef<'data>>(
+        &self,
+        data: R,
+        va: u32,
+    ) -> Option<(&'data [u8], u32)> {
+        self.iter()
+            .find_map(|section| section.pe_data_containing(data, va))
+    }
+
+    /// Return the section that contains a given virtual address.
+    pub fn section_containing(&self, va: u32) -> Option<&'data ImageSectionHeader> {
+        self.iter().find(|section| section.contains_rva(va))
+    }
+}
+
+impl pe::ImageSectionHeader {
+    /// Return the offset and size of the section in a PE file.
+    ///
+    /// The size of the range will be the minimum of the file size and virtual size.
+    pub fn pe_file_range(&self) -> (u32, u32) {
+        // Pointer and size will be zero for uninitialized data; we don't need to validate this.
+        let offset = self.pointer_to_raw_data.get(LE);
+        let size = cmp::min(self.virtual_size.get(LE), self.size_of_raw_data.get(LE));
+        (offset, size)
+    }
+
+    /// Return the file offset of the given virtual address, and the remaining size up
+    /// to the end of the section.
+    ///
+    /// Returns `None` if the section does not contain the address.
+    pub fn pe_file_range_at(&self, va: u32) -> Option<(u32, u32)> {
+        let section_va = self.virtual_address.get(LE);
+        let offset = va.checked_sub(section_va)?;
+        let (section_offset, section_size) = self.pe_file_range();
+        // Address must be within section (and not at its end).
+        if offset < section_size {
+            Some((section_offset.checked_add(offset)?, section_size - offset))
+        } else {
+            None
+        }
+    }
+
+    /// Return the virtual address and size of the section.
+    pub fn pe_address_range(&self) -> (u32, u32) {
+        (self.virtual_address.get(LE), self.virtual_size.get(LE))
+    }
+
+    /// Return the section data in a PE file.
+    ///
+    /// The length of the data will be the minimum of the file size and virtual size.
+    pub fn pe_data<'data, R: ReadRef<'data>>(&self, data: R) -> Result<&'data [u8]> {
+        let (offset, size) = self.pe_file_range();
+        data.read_bytes_at(offset.into(), size.into())
+            .read_error("Invalid PE section offset or size")
+    }
+
+    /// Return the data starting at the given virtual address, up to the end of the
+    /// section.
+    ///
+    /// Ignores sections with invalid data.
+    ///
+    /// Returns `None` if the section does not contain the address.
+    pub fn pe_data_at<'data, R: ReadRef<'data>>(&self, data: R, va: u32) -> Option<&'data [u8]> {
+        let (offset, size) = self.pe_file_range_at(va)?;
+        data.read_bytes_at(offset.into(), size.into()).ok()
+    }
+
+    /// Tests whether a given RVA is part of this section
+    pub fn contains_rva(&self, va: u32) -> bool {
+        let section_va = self.virtual_address.get(LE);
+        match va.checked_sub(section_va) {
+            None => false,
+            Some(offset) => {
+                // Address must be within section (and not at its end).
+                offset < self.virtual_size.get(LE)
+            }
+        }
+    }
+
+    /// Return the section data if it contains the given virtual address.
+    ///
+    /// Also returns the virtual address of that section.
+    ///
+    /// Ignores sections with invalid data.
+    pub fn pe_data_containing<'data, R: ReadRef<'data>>(
+        &self,
+        data: R,
+        va: u32,
+    ) -> Option<(&'data [u8], u32)> {
+        let section_va = self.virtual_address.get(LE);
+        let offset = va.checked_sub(section_va)?;
+        let (section_offset, section_size) = self.pe_file_range();
+        // Address must be within section (and not at its end).
+        if offset < section_size {
+            let section_data = data
+                .read_bytes_at(section_offset.into(), section_size.into())
+                .ok()?;
+            Some((section_data, section_va))
+        } else {
+            None
+        }
+    }
+}
+
+/// An iterator over the relocations in an `PeSection`.
+#[derive(Debug)]
+pub struct PeRelocationIterator<'data, 'file, R = &'data [u8]>(
+    PhantomData<(&'data (), &'file (), R)>,
+);
+
+impl<'data, 'file, R> Iterator for PeRelocationIterator<'data, 'file, R> {
+    type Item = (u64, Relocation);
+
+    fn next(&mut self) -> Option<Self::Item> {
+        None
+    }
+}