fix(inflate): byte boundary aligning underflow

0x5eal · Jan 7, 2025 · 6daf378 · 6daf378
1 parent 77d1a75
commit 6daf378
Showing 1 changed file with 4 additions and 4 deletions.
diff --git a/lib/inflate.luau b/lib/inflate.luau
@@ -313,10 +313,10 @@ end
 --- Processes an uncompressed block
 local function inflateUncompressedBlock(d: Data)
 	-- Align to byte boundary
-	while d.bitcount > 8 do
-		d.sourceIndex -= 1
-		d.bitcount -= 8
-	end
+	local bytesToMove = d.bitcount // 8
+	d.sourceIndex -= bytesToMove
+	d.bitcount = 0
+	d.tag = 0
 
 	-- Read block length and its complement
 	local length = buffer.readu8(d.source, d.sourceIndex + 1)