COMMON: Fix GCC-9 Warning in MacResManager Class

This is another case of a warning from using memset to clear a non-trivial
data structure.

GCC-9 detects this with the default warning of -Wclass-memaccess.

2 files changed, 25 insertions, 1 deletions

diff --git a/common/macresman.cpp b/common/macresman.cpp
index 553b138717..ac78ea0bd0 100644
--- a/common/macresman.cpp
+++ b/common/macresman.cpp
@@ -47,7 +47,22 @@ namespace Common {
 #define MAXNAMELEN 63
 
 MacResManager::MacResManager() {
-	memset(this, 0, sizeof(MacResManager));
+	_stream = nullptr;
+	// _baseFileName cleared by String constructor
+
+	_mode = kResForkNone;
+
+	_resForkOffset = 0;
+	_resForkSize = 0;
+
+	_dataOffset = 0;
+	_dataLength = 0;
+	_mapOffset = 0;
+	_mapLength = 0;
+	_resMap.reset();
+	_resTypes = nullptr;
+	_resLists = nullptr;
+
 	close();
 }
 
diff --git a/common/macresman.h b/common/macresman.h
index 1be825b7b4..703f3a1d29 100644
--- a/common/macresman.h
+++ b/common/macresman.h
@@ -220,6 +220,15 @@ private:
 		uint16 typeOffset;
 		uint16 nameOffset;
 		uint16 numTypes;
+
+		void reset() {
+			resAttr = 0;
+			typeOffset = 0;
+			nameOffset = 0;
+			numTypes = 0;
+		}
+
+		ResMap() { reset(); }
 	};
 
 	struct ResType {