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-rw-r--r--lodepng.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/lodepng.cpp b/lodepng.cpp
index 2be3fbe..426236e 100644
--- a/lodepng.cpp
+++ b/lodepng.cpp
@@ -1468,7 +1468,7 @@ static unsigned encodeLZ77(uivector* out, Hash* hash,
const unsigned char *lastptr, *foreptr, *backptr;
unsigned hashpos;
- if(windowsize <= 0 || windowsize > 32768) return 60; /*error: windowsize smaller/larger than allowed*/
+ if(windowsize == 0 || windowsize > 32768) return 60; /*error: windowsize smaller/larger than allowed*/
if((windowsize & (windowsize - 1)) != 0) return 90; /*error: must be power of two*/
if(nicematch > MAX_SUPPORTED_DEFLATE_LENGTH) nicematch = MAX_SUPPORTED_DEFLATE_LENGTH;