From 26488721a0cdb26c33f4e35f177c40fb81984346 Mon Sep 17 00:00:00 2001
From: Kostya Shishkov <kostya.shishkov@gmail.com>
Date: Sat, 8 Dec 2018 15:21:22 +0100
Subject: [PATCH] codebook: reject invalid codes

---
 src/io/codebook.rs | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/io/codebook.rs b/src/io/codebook.rs
index 5bfd719..3d1e8d0 100644
--- a/src/io/codebook.rs
+++ b/src/io/codebook.rs
@@ -195,7 +195,12 @@ impl<S: Copy> Codebook<S> {
         let mut symidx: usize = 0;
         for i in 0..cb.len() {
             let bits = cb.bits(i);
-            if bits > 0 { nnz = nnz + 1; }
+            if bits > 0 {
+                nnz = nnz + 1;
+                if cb.code(i) >= (1 << bits) {
+                    return Err(CodebookError::InvalidCodebook);
+                }
+            }
             maxbits = max(bits, maxbits);
             if bits > MAX_LUT_BITS {
                 let code = cb.code(i);
-- 
2.30.2