From 22f23ef7889eec27a5bed3eaa49f52c9416ea01e Mon Sep 17 00:00:00 2001
From: Jonathan Behrens <fintelia@gmail.com>
Date: Thu, 1 Aug 2024 20:38:06 -0700
Subject: [PATCH] Special case RLE codes (#87)

---
 src/lossless.rs | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/lossless.rs b/src/lossless.rs
index 4ba4aa6..36b5357 100644
--- a/src/lossless.rs
+++ b/src/lossless.rs
@@ -548,8 +548,15 @@ impl<R: Read> LosslessDecoder<R> {
                     return Err(DecodingError::BitStreamError);
                 }
 
-                for i in 0..length * 4 {
-                    data[index * 4 + i] = data[index * 4 + i - dist * 4];
+                if dist == 1 {
+                    let value: [u8; 4] = data[(index - dist) * 4..][..4].try_into().unwrap();
+                    for i in 0..length {
+                        data[index * 4 + i * 4..][..4].copy_from_slice(&value);
+                    }
+                } else {
+                    for i in 0..length * 4 {
+                        data[index * 4 + i] = data[index * 4 + i - dist * 4];
+                    }
                 }
                 index += length;
             } else {