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/entry.py

@@ -60,7 +60,10 @@ class Entry(object):
             the containing section, 0 if none. The pad bytes become part of
             the entry.
         data: Contents of entry (string of bytes). This does not include
-            padding created by pad_before or pad_after
+            padding created by pad_before or pad_after. If the entry is
+            compressed, this contains the compressed data.
+        uncomp_data: Original uncompressed data, if this entry is compressed,
+            else None
         compress: Compression algoithm used (e.g. 'lz4'), 'none' if none
         orig_offset: Original offset value read from node
         orig_size: Original size value read from node
@@ -83,6 +86,7 @@ class Entry(object):
         self.pre_reset_size = None
         self.uncomp_size = None
         self.data = None
+        self.uncomp_data = None
         self.contents_size = 0
         self.align = None
         self.align_size = None
@@ -856,6 +860,7 @@ features to produce new behaviours.
         Returns:
             Compressed data (first word is the compressed size)
         """
+        self.uncomp_data = indata
         if self.compress != 'none':
             self.uncomp_size = len(indata)
         data = tools.Compress(indata, self.compress)

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),