From 4f463e3dee863cdfeb34f37bcca6ae0cb46f7b51 Mon Sep 17 00:00:00 2001
From: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Date: Fri, 19 Aug 2022 16:25:27 +0200
Subject: [PATCH] binman: Remove obsolete compressed data header handling

Remove the obsolete compressed data header handling from the utilities
to compress and decompress data. The header is uncommon, not supported
by U-Boot and incompatible with external compressed artifacts.

Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
---
 tools/binman/cbfs_util.py |  8 ++++----
 tools/binman/comp_util.py | 11 ++---------
 tools/binman/entry.py     |  6 +++---
 tools/binman/ftest.py     | 14 ++++++--------
 4 files changed, 15 insertions(+), 24 deletions(-)

diff --git a/tools/binman/cbfs_util.py b/tools/binman/cbfs_util.py
index 9cad038..a1836f4 100644
--- a/tools/binman/cbfs_util.py
+++ b/tools/binman/cbfs_util.py
@@ -241,9 +241,9 @@ class CbfsFile(object):
         """Handle decompressing data if necessary"""
         indata = self.data
         if self.compress == COMPRESS_LZ4:
-            data = comp_util.decompress(indata, 'lz4', with_header=False)
+            data = comp_util.decompress(indata, 'lz4')
         elif self.compress == COMPRESS_LZMA:
-            data = comp_util.decompress(indata, 'lzma', with_header=False)
+            data = comp_util.decompress(indata, 'lzma')
         else:
             data = indata
         self.memlen = len(data)
@@ -362,9 +362,9 @@ class CbfsFile(object):
         elif self.ftype == TYPE_RAW:
             orig_data = data
             if self.compress == COMPRESS_LZ4:
-                data = comp_util.compress(orig_data, 'lz4', with_header=False)
+                data = comp_util.compress(orig_data, 'lz4')
             elif self.compress == COMPRESS_LZMA:
-                data = comp_util.compress(orig_data, 'lzma', with_header=False)
+                data = comp_util.compress(orig_data, 'lzma')
             self.memlen = len(orig_data)
             self.data_len = len(data)
             attr = struct.pack(ATTR_COMPRESSION_FORMAT,
diff --git a/tools/binman/comp_util.py b/tools/binman/comp_util.py
index dc76ada..269bbf7 100644
--- a/tools/binman/comp_util.py
+++ b/tools/binman/comp_util.py
@@ -3,7 +3,6 @@
 #
 """Utilities to compress and decompress data"""
 
-import struct
 import tempfile
 
 from binman import bintool
@@ -16,7 +15,7 @@ LZMA_ALONE = bintool.Bintool.create('lzma_alone')
 HAVE_LZMA_ALONE = LZMA_ALONE.is_present()
 
 
-def compress(indata, algo, with_header=True):
+def compress(indata, algo):
     """Compress some data using a given algorithm
 
     Note that for lzma this uses an old version of the algorithm, not that
@@ -41,12 +40,9 @@ def compress(indata, algo, with_header=True):
         data = LZMA_ALONE.compress(indata)
     else:
         raise ValueError("Unknown algorithm '%s'" % algo)
-    if with_header:
-        hdr = struct.pack('<I', len(data))
-        data = hdr + data
     return data
 
-def decompress(indata, algo, with_header=True):
+def decompress(indata, algo):
     """Decompress some data using a given algorithm
 
     Note that for lzma this uses an old version of the algorithm, not that
@@ -64,9 +60,6 @@ def decompress(indata, algo, with_header=True):
     """
     if algo == 'none':
         return indata
-    if with_header:
-        data_len = struct.unpack('<I', indata[:4])[0]
-        indata = indata[4:4 + data_len]
     if algo == 'lz4':
         data = LZ4.decompress(indata)
     elif algo == 'lzma':
diff --git a/tools/binman/entry.py b/tools/binman/entry.py
index c31b845..f448adb 100644
--- a/tools/binman/entry.py
+++ b/tools/binman/entry.py
@@ -1112,12 +1112,12 @@ features to produce new behaviours.
             indata: Data to compress
 
         Returns:
-            Compressed data (first word is the compressed size)
+            Compressed data
         """
         self.uncomp_data = indata
         if self.compress != 'none':
             self.uncomp_size = len(indata)
-        data = comp_util.compress(indata, self.compress, with_header=False)
+        data = comp_util.compress(indata, self.compress)
         return data
 
     def DecompressData(self, indata):
@@ -1129,7 +1129,7 @@ features to produce new behaviours.
         Returns:
             Decompressed data
         """
-        data = comp_util.decompress(indata, self.compress, with_header=False)
+        data = comp_util.decompress(indata, self.compress)
         if self.compress != 'none':
             self.uncomp_size = len(data)
         self.uncomp_data = data
diff --git a/tools/binman/ftest.py b/tools/binman/ftest.py
index 90142db..47d35ba 100644
--- a/tools/binman/ftest.py
+++ b/tools/binman/ftest.py
@@ -1967,7 +1967,7 @@ class TestFunctional(unittest.TestCase):
             self._ResetDtbs()
 
     def _decompress(self, data):
-        return comp_util.decompress(data, 'lz4', with_header=False)
+        return comp_util.decompress(data, 'lz4')
 
     def testCompress(self):
         """Test compression of blobs"""
@@ -2856,7 +2856,7 @@ class TestFunctional(unittest.TestCase):
     def testExtractCbfsRaw(self):
         """Test extracting CBFS compressed data without decompressing it"""
         data = self._RunExtractCmd('section/cbfs/u-boot-dtb', decomp=False)
-        dtb = comp_util.decompress(data, 'lzma', with_header=False)
+        dtb = comp_util.decompress(data, 'lzma')
         self.assertEqual(EXTRACT_DTB_SIZE, len(dtb))
 
     def testExtractBadEntry(self):
@@ -4427,16 +4427,14 @@ class TestFunctional(unittest.TestCase):
         rest = base[len(U_BOOT_DATA):]
 
         # Check compressed data
-        expect1 = comp_util.compress(COMPRESS_DATA + U_BOOT_DATA, 'lz4',
-                                     with_header=False)
+        expect1 = comp_util.compress(COMPRESS_DATA + U_BOOT_DATA, 'lz4')
         data1 = rest[:len(expect1)]
         section1 = self._decompress(data1)
         self.assertEquals(expect1, data1)
         self.assertEquals(COMPRESS_DATA + U_BOOT_DATA, section1)
         rest1 = rest[len(expect1):]
 
-        expect2 = comp_util.compress(COMPRESS_DATA + COMPRESS_DATA, 'lz4',
-                                     with_header=False)
+        expect2 = comp_util.compress(COMPRESS_DATA + COMPRESS_DATA, 'lz4')
         data2 = rest1[:len(expect2)]
         section2 = self._decompress(data2)
         self.assertEquals(expect2, data2)
@@ -5221,11 +5219,11 @@ fdt         fdtmap                Extract the devicetree blob from the fdtmap
 
     def testInvalidCompress(self):
         with self.assertRaises(ValueError) as e:
-            comp_util.compress(b'', 'invalid', with_header=False)
+            comp_util.compress(b'', 'invalid')
         self.assertIn("Unknown algorithm 'invalid'", str(e.exception))
 
         with self.assertRaises(ValueError) as e:
-            comp_util.decompress(b'1234', 'invalid', with_header=False)
+            comp_util.decompress(b'1234', 'invalid')
         self.assertIn("Unknown algorithm 'invalid'", str(e.exception))
 
     def testBintoolDocs(self):
-- 
2.7.4