From 5eb47bed81de1326843e1e3bad41addcfed08d4e Mon Sep 17 00:00:00 2001
From: Bent Bisballe Nyeng <deva@aasimon.org>
Date: Wed, 6 Mar 2019 17:28:57 +0100
Subject: Fix crash if opening Resource with a directory instead of a file.

---
 plugingui/resource.cc | 16 ++++++++++++++--
 test/resource_test.cc | 23 ++++++++++++++++++++---
 2 files changed, 34 insertions(+), 5 deletions(-)

diff --git a/plugingui/resource.cc b/plugingui/resource.cc
index 2435668..432f25d 100644
--- a/plugingui/resource.cc
+++ b/plugingui/resource.cc
@@ -28,11 +28,13 @@
 
 #include <hugin.hpp>
 #include <cstdio>
+#include <climits>
 
 // rcgen generated file containing rc_data declaration.
 #include "resource_data.h"
 
-namespace GUI {
+namespace GUI
+{
 
 // Internal resources start with a colon.
 static bool nameIsInternal(const std::string& name)
@@ -85,7 +87,17 @@ Resource::Resource(const std::string& name)
 			std::fclose(fp);
 			return;
 		}
-		size_t filesize = ftell(fp);
+
+		long filesize = std::ftell(fp);
+
+		// Apparently fseek doesn't fail if fp points to a directory that has been
+		// opened (which doesn't fail either!!) and ftell will then fail by either
+		// returning -1 or LONG_MAX
+		if(filesize == -1L || filesize == LONG_MAX)
+		{
+			std::fclose(fp);
+			return;
+		}
 
 		// Reserve space in the string for the data.
 		externalData.reserve(filesize);
diff --git a/test/resource_test.cc b/test/resource_test.cc
index 2e88c45..28a244e 100644
--- a/test/resource_test.cc
+++ b/test/resource_test.cc
@@ -30,10 +30,12 @@
 
 #include "drumkit_creator.h"
 
-class ResourceTester : public GUI::Resource {
+class ResourceTester
+	: public GUI::Resource
+{
 public:
 	ResourceTester(const std::string& name)
-		: Resource(name)
+		: GUI::Resource(name)
 	{}
 
 	bool probeIsInternal()
@@ -42,13 +44,15 @@ public:
 	}
 };
 
-class ResourceTest : public DGUnit
+class ResourceTest
+	: public DGUnit
 {
 public:
 	ResourceTest()
 	{
 		DGUNIT_TEST(ResourceTest::externalReadTest);
 		DGUNIT_TEST(ResourceTest::internalReadTest);
+		DGUNIT_TEST(ResourceTest::failTest);
 	}
 
 	DrumkitCreator drumkit_creator;
@@ -70,6 +74,19 @@ public:
 		DGUNIT_ASSERT(rc.valid());
 		DGUNIT_ASSERT_EQUAL((size_t)1123, rc.size());
 	}
+
+	void failTest()
+	{
+		{
+			ResourceTester rc("/tmp/");
+			DGUNIT_ASSERT(!rc.valid());
+		}
+
+		{
+			ResourceTester rc("no_such_file");
+			DGUNIT_ASSERT(!rc.valid());
+		}
+	}
 };
 
 // Registers the fixture into the 'registry'
-- 
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