From be28a9d813056e6f86a1f71d6cbb45d2d100f17f Mon Sep 17 00:00:00 2001
From: Lilith River <lilith@imazen.io>
Date: Thu, 5 Sep 2024 17:53:19 -0400
Subject: [PATCH] Fix libpng diagnostics for unexpctedeof

---
 imageflow_core/src/codecs/libpng_decoder.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/imageflow_core/src/codecs/libpng_decoder.rs b/imageflow_core/src/codecs/libpng_decoder.rs
index 84e8bdff..88d3a47b 100644
--- a/imageflow_core/src/codecs/libpng_decoder.rs
+++ b/imageflow_core/src/codecs/libpng_decoder.rs
@@ -161,11 +161,11 @@ impl PngDec{
                     let len = decoder.io.try_get_length();
                     let pos = decoder.io.try_get_position();
                     let remaining = if len.is_some() && pos.is_some() {
-                        Some(len.unwrap() - pos.unwrap())
+                        Some(len.unwrap() as i64 - pos.unwrap() as i64)
                     } else {
                         None
                     };
-                    let missing = remaining.map(|r| (bytes_requested as u64) - r);
+                    let missing = remaining.map(|r| (bytes_requested as i64) - (r as i64));
                     let err =
                     FlowError::without_location(ErrorKind::DecodingIoError,
                         format!("{:?} (failed to read requested {} bytes (only {:?} remain), pos={:?}, len={:?}, missing={:?})", err, bytes_requested, remaining, pos, len, missing)).at(here!());