From b00049732f66eaeeb4abf57586201e60c186a008 Mon Sep 17 00:00:00 2001
From: sluicebox
Date: Mon, 15 Apr 2019 07:17:23 -0700
Subject: SCI: Fix diskdump patch file headers

Fix 'diskdump' debugger command creating an additional patch file
header for resources that were loaded from patch files
---
 engines/sci/resource.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/engines/sci/resource.cpp b/engines/sci/resource.cpp
index df91fb8f51..8e4a6d13b9 100644
--- a/engines/sci/resource.cpp
+++ b/engines/sci/resource.cpp
@@ -224,10 +224,14 @@ void Resource::unalloc() {
 }
 
 void Resource::writeToStream(Common::WriteStream *stream) const {
-	stream->writeByte(getType() | 0x80); // 0x80 is required by old Sierra SCI, otherwise it wont accept the patch file
-	stream->writeByte(_headerSize);
-	if (_headerSize > 0)
+	if (_headerSize == 0) {
+		// create patch file header
+		stream->writeByte(getType() | 0x80); // 0x80 is required by old Sierra SCI, otherwise it wont accept the patch file
+		stream->writeByte(_headerSize);
+	} else {
+		// use existing patch file header
 		stream->write(_header, _headerSize);
+	}
 	stream->write(_data, _size);
 }
 
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