Vendor things

third-party/vendor/backtrace/src/symbolize/gimli/mmap_fake.rs

@@ -0,0 +1,25 @@
+use super::{mystd::io::Read, File};
+use alloc::vec::Vec;
+use core::ops::Deref;
+
+pub struct Mmap {
+    vec: Vec<u8>,
+}
+
+impl Mmap {
+    pub unsafe fn map(mut file: &File, len: usize) -> Option<Mmap> {
+        let mut mmap = Mmap {
+            vec: Vec::with_capacity(len),
+        };
+        file.read_to_end(&mut mmap.vec).ok()?;
+        Some(mmap)
+    }
+}
+
+impl Deref for Mmap {
+    type Target = [u8];
+
+    fn deref(&self) -> &[u8] {
+        &self.vec[..]
+    }
+}