From 8dc1d70d854a83c473222882e217392d314b264b Mon Sep 17 00:00:00 2001
From: Filip Sykala - NTB T15p <Filip.Sykala@Prusa3D.cz>
Date: Tue, 30 Jan 2024 11:22:00 +0100
Subject: [PATCH] Fix SPE-2129
 https://github.com/prusa3d/PrusaSlicer/issues/12157

(cherry picked from commit 309ec8c5fbcc0754f165b51e39e7c291da13ab77)
---
 src/libslic3r/Format/objparser.cpp | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/libslic3r/Format/objparser.cpp b/src/libslic3r/Format/objparser.cpp
index 2b80a26721..3fbd3102ec 100644
--- a/src/libslic3r/Format/objparser.cpp
+++ b/src/libslic3r/Format/objparser.cpp
@@ -352,10 +352,18 @@ bool objparse(const char *path, ObjData &data)
 		return false;
 
 	try {
-		char buf[65536 * 2];
+		char buf[(65536+1) * 2];
 		size_t len = 0;
 		size_t lenPrev = 0;
 		while ((len = ::fread(buf + lenPrev, 1, 65536, pFile)) != 0) {
+            if (std::feof(pFile)) {
+                // Fix issue with missing last trinagle in obj file:
+                // https://github.com/prusa3d/PrusaSlicer/issues/12157
+                // algorithm expect line endings after last face
+                // but file format support it
+                buf[len] = '\n';
+                ++len;
+            }
 			len += lenPrev;
 			size_t lastLine = 0;
 			for (size_t i = 0; i < len; ++ i)