binman: Store the original data before compression

When compressing an entry, the original uncompressed data is overwritten.
Store it so it is available if needed.

Signed-off-by: Simon Glass <sjg@chromium.org>

tools/binman/ftest.py

@@ -1810,6 +1810,18 @@ class TestFunctional(unittest.TestCase):
         props = self._GetPropTree(dtb, ['size', 'uncomp-size'])
         orig = self._decompress(data)
         self.assertEquals(COMPRESS_DATA, orig)
+
+        # Do a sanity check on various fields
+        image = control.images['image']
+        entries = image.GetEntries()
+        self.assertEqual(1, len(entries))
+
+        entry = entries['blob']
+        self.assertEqual(COMPRESS_DATA, entry.uncomp_data)
+        self.assertEqual(len(COMPRESS_DATA), entry.uncomp_size)
+        orig = self._decompress(entry.data)
+        self.assertEqual(orig, entry.uncomp_data)
+
         expected = {
             'blob:uncomp-size': len(COMPRESS_DATA),
             'blob:size': len(data),