swlaycache: trust the in-stream size, not the size of the stream

It's allowed to have extra data at the end of the stream, which is to be
ignored.

1 files changed, 7 insertions, 4 deletions

diff --git a/msodumper/swlaycacherecord.py b/msodumper/swlaycacherecord.py
index dac75e4..fc03421 100644
--- a/msodumper/swlaycacherecord.py
+++ b/msodumper/swlaycacherecord.py
@@ -14,13 +14,16 @@ class SwLayCacheStream(BinaryStream):
 
     def dump(self):
         print('<stream type="SwLayCache" size="%d">' % self.size)
-        posOrig = self.pos
         header = Header(self)
         header.dump()
 
-        while posOrig + self.size > self.pos:
-            record = CacheRecord(self)
-            record.dump()
+        pos = self.pos
+        firstRecord = CacheRecord(self)
+        firstRecord.dump()
+        endPos = pos + firstRecord.nSize
+
+        while endPos > self.pos:
+            CacheRecord(self).dump()
         print('</stream>')