1 files changed, 117 insertions, 0 deletions
diff --git a/vendor/gimli/src/write/endian_vec.rs b/vendor/gimli/src/write/endian_vec.rs
new file mode 100644
index 0000000..7b04060
--- /dev/null
+++ b/vendor/gimli/src/write/endian_vec.rs
@@ -0,0 +1,117 @@
+use alloc::vec::Vec;
+use std::mem;
+
+use crate::endianity::Endianity;
+use crate::write::{Error, Result, Writer};
+
+/// A `Vec<u8>` with endianity metadata.
+///
+/// This implements the `Writer` trait, which is used for all writing of DWARF sections.
+#[derive(Debug, Clone)]
+pub struct EndianVec<Endian>
+where
+    Endian: Endianity,
+{
+    vec: Vec<u8>,
+    endian: Endian,
+}
+
+impl<Endian> EndianVec<Endian>
+where
+    Endian: Endianity,
+{
+    /// Construct an empty `EndianVec` with the given endianity.
+    pub fn new(endian: Endian) -> EndianVec<Endian> {
+        EndianVec {
+            vec: Vec::new(),
+            endian,
+        }
+    }
+
+    /// Return a reference to the raw slice.
+    pub fn slice(&self) -> &[u8] {
+        &self.vec
+    }
+
+    /// Convert into a `Vec<u8>`.
+    pub fn into_vec(self) -> Vec<u8> {
+        self.vec
+    }
+
+    /// Take any written data out of the `EndianVec`, leaving an empty `Vec` in its place.
+    pub fn take(&mut self) -> Vec<u8> {
+        let mut vec = Vec::new();
+        mem::swap(&mut self.vec, &mut vec);
+        vec
+    }
+}
+
+impl<Endian> Writer for EndianVec<Endian>
+where
+    Endian: Endianity,
+{
+    type Endian = Endian;
+
+    #[inline]
+    fn endian(&self) -> Self::Endian {
+        self.endian
+    }
+
+    #[inline]
+    fn len(&self) -> usize {
+        self.vec.len()
+    }
+
+    fn write(&mut self, bytes: &[u8]) -> Result<()> {
+        self.vec.extend(bytes);
+        Ok(())
+    }
+
+    fn write_at(&mut self, offset: usize, bytes: &[u8]) -> Result<()> {
+        if offset > self.vec.len() {
+            return Err(Error::OffsetOutOfBounds);
+        }
+        let to = &mut self.vec[offset..];
+        if bytes.len() > to.len() {
+            return Err(Error::LengthOutOfBounds);
+        }
+        let to = &mut to[..bytes.len()];
+        to.copy_from_slice(bytes);
+        Ok(())
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::LittleEndian;
+
+    #[test]
+    fn test_endian_vec() {
+        let mut w = EndianVec::new(LittleEndian);
+        assert_eq!(w.endian(), LittleEndian);
+        assert_eq!(w.len(), 0);
+
+        w.write(&[1, 2]).unwrap();
+        assert_eq!(w.slice(), &[1, 2]);
+        assert_eq!(w.len(), 2);
+
+        w.write(&[3, 4, 5]).unwrap();
+        assert_eq!(w.slice(), &[1, 2, 3, 4, 5]);
+        assert_eq!(w.len(), 5);
+
+        w.write_at(0, &[6, 7]).unwrap();
+        assert_eq!(w.slice(), &[6, 7, 3, 4, 5]);
+        assert_eq!(w.len(), 5);
+
+        w.write_at(3, &[8, 9]).unwrap();
+        assert_eq!(w.slice(), &[6, 7, 3, 8, 9]);
+        assert_eq!(w.len(), 5);
+
+        assert_eq!(w.write_at(4, &[6, 7]), Err(Error::LengthOutOfBounds));
+        assert_eq!(w.write_at(5, &[6, 7]), Err(Error::LengthOutOfBounds));
+        assert_eq!(w.write_at(6, &[6, 7]), Err(Error::OffsetOutOfBounds));
+
+        assert_eq!(w.into_vec(), vec![6, 7, 3, 8, 9]);
+    }
+}