SCI32: Fix reading view, pic, and palette patches

Unlike SCI16 games, the location of data within SCI32 patch files
is calculated on a per-resource-type basis by the game engine,
instead of by reading byte 1 of the patch file.

1 files changed, 14 insertions, 1 deletions

diff --git a/engines/sci/resource.cpp b/engines/sci/resource.cpp
index 5b57eed123..31ceb6808c 100644
--- a/engines/sci/resource.cpp
+++ b/engines/sci/resource.cpp
@@ -1399,7 +1399,20 @@ void ResourceManager::processPatch(ResourceSource *source, ResourceType resource
 	}
 
 	byte patchType = convertResType(fileStream->readByte());
-	byte patchDataOffset = fileStream->readByte();
+	int32 patchDataOffset;
+	if (_volVersion < kResVersionSci2) {
+		patchDataOffset = fileStream->readByte();
+	} else if (patchType == kResourceTypeView) {
+		fileStream->seek(3, SEEK_SET);
+		patchDataOffset = fileStream->readByte() + 22 + 2;
+	} else if (patchType == kResourceTypePic) {
+		patchDataOffset = 2;
+	} else if (patchType == kResourceTypePalette) {
+		fileStream->seek(3, SEEK_SET);
+		patchDataOffset = fileStream->readByte() + 2;
+	} else {
+		patchDataOffset = 0;
+	}
 
 	delete fileStream;