implement Block::pad without integer conversion

Here, this gives around 2% in speedup in the 1024 byte case.

1 files changed, 3 insertions, 1 deletions

diff --git a/src/block.rs b/src/block.rs
index 0e64bbe..ce2d22c 100644
--- a/src/block.rs
+++ b/src/block.rs
@@ -72,7 +72,9 @@ impl Block {
     /// This corresponds to X10* in the paper.
     pub fn pad(&self, length: usize) -> Block {
         assert!(length <= 127);
-        Block::from_int(self.to_int() | (1 << (127 - length)))
+        let mut result = *self;
+        result[length / 8] |= 1 << (7 - length % 8);
+        result
     }
 
     /// Clip the block by setting all bits beyond the given length to 0.