From 7afea49893078cfc624ee7f943c1155a4c31e58a Mon Sep 17 00:00:00 2001
From: Ryan Oldenburg <ryan@guzba.com>
Date: Mon, 16 May 2022 19:05:13 -0500
Subject: [PATCH] single branch

---
 src/pixie/fileformats/jpeg.nim | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/pixie/fileformats/jpeg.nim b/src/pixie/fileformats/jpeg.nim
index 543c8ea..3bb484d 100644
--- a/src/pixie/fileformats/jpeg.nim
+++ b/src/pixie/fileformats/jpeg.nim
@@ -91,7 +91,11 @@ template failInvalid(reason = "unable to load") =
 
 template clampByte(x: int32): uint8 =
   ## Clamp integer into byte range.
-  clamp(x, 0, 0xFF).uint8
+  # clamp(x, 0, 0xFF).uint8
+  let
+    signBit = (cast[uint32](x) shr 31)
+    value = cast[uint32](x) and (signBit - 1)
+  min(value, 255).uint8
 
 proc readUint8(state: var DecoderState): uint8 =
   ## Reads a byte from the input stream.