Merging upstream version 1.70.0+dfsg2.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/vendor/crypto-bigint/src/uint/resize.rs b/vendor/crypto-bigint/src/uint/resize.rs
new file mode 100644
index 000000000..5a5ec7eef
--- /dev/null
+++ b/vendor/crypto-bigint/src/uint/resize.rs
@@ -0,0 +1,37 @@
+use super::UInt;
+
+impl<const LIMBS: usize> UInt<LIMBS> {
+    /// Construct a `UInt<T>` from the unsigned integer value,
+    /// truncating the upper bits if the value is too large to be
+    /// represented.
+    #[inline(always)]
+    pub const fn resize<const T: usize>(&self) -> UInt<T> {
+        let mut res = UInt::ZERO;
+        let mut i = 0;
+        let dim = if T < LIMBS { T } else { LIMBS };
+        while i < dim {
+            res.limbs[i] = self.limbs[i];
+            i += 1;
+        }
+        res
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{U128, U64};
+
+    #[test]
+    fn resize_larger() {
+        let u = U64::from_be_hex("AAAAAAAABBBBBBBB");
+        let u2: U128 = u.resize();
+        assert_eq!(u2, U128::from_be_hex("0000000000000000AAAAAAAABBBBBBBB"));
+    }
+
+    #[test]
+    fn resize_smaller() {
+        let u = U128::from_be_hex("AAAAAAAABBBBBBBBCCCCCCCCDDDDDDDD");
+        let u2: U64 = u.resize();
+        assert_eq!(u2, U64::from_be_hex("CCCCCCCCDDDDDDDD"));
+    }
+}