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-rw-r--r--third_party/libwebrtc/build/android/gyp/util/zipalign.py97
1 files changed, 97 insertions, 0 deletions
diff --git a/third_party/libwebrtc/build/android/gyp/util/zipalign.py b/third_party/libwebrtc/build/android/gyp/util/zipalign.py
new file mode 100644
index 0000000000..c5c4ea88c6
--- /dev/null
+++ b/third_party/libwebrtc/build/android/gyp/util/zipalign.py
@@ -0,0 +1,97 @@
+# Copyright 2019 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import struct
+import sys
+import zipfile
+
+from util import build_utils
+
+_FIXED_ZIP_HEADER_LEN = 30
+
+
+def _PatchedDecodeExtra(self):
+ # Try to decode the extra field.
+ extra = self.extra
+ unpack = struct.unpack
+ while len(extra) >= 4:
+ tp, ln = unpack('<HH', extra[:4])
+ if tp == 1:
+ if ln >= 24:
+ counts = unpack('<QQQ', extra[4:28])
+ elif ln == 16:
+ counts = unpack('<QQ', extra[4:20])
+ elif ln == 8:
+ counts = unpack('<Q', extra[4:12])
+ elif ln == 0:
+ counts = ()
+ else:
+ raise RuntimeError("Corrupt extra field %s" % (ln, ))
+
+ idx = 0
+
+ # ZIP64 extension (large files and/or large archives)
+ if self.file_size in (0xffffffffffffffff, 0xffffffff):
+ self.file_size = counts[idx]
+ idx += 1
+
+ if self.compress_size == 0xffffffff:
+ self.compress_size = counts[idx]
+ idx += 1
+
+ if self.header_offset == 0xffffffff:
+ self.header_offset = counts[idx]
+ idx += 1
+
+ extra = extra[ln + 4:]
+
+
+def ApplyZipFileZipAlignFix():
+ """Fix zipfile.ZipFile() to be able to open zipaligned .zip files.
+
+ Android's zip alignment uses not-quite-valid zip headers to perform alignment.
+ Python < 3.4 crashes when trying to load them.
+ https://bugs.python.org/issue14315
+ """
+ if sys.version_info < (3, 4):
+ zipfile.ZipInfo._decodeExtra = ( # pylint: disable=protected-access
+ _PatchedDecodeExtra)
+
+
+def _SetAlignment(zip_obj, zip_info, alignment):
+ """Sets a ZipInfo's extra field such that the file will be aligned.
+
+ Args:
+ zip_obj: The ZipFile object that is being written.
+ zip_info: The ZipInfo object about to be written.
+ alignment: The amount of alignment (e.g. 4, or 4*1024).
+ """
+ cur_offset = zip_obj.fp.tell()
+ header_size = _FIXED_ZIP_HEADER_LEN + len(zip_info.filename)
+ padding_needed = (alignment - (
+ (cur_offset + header_size) % alignment)) % alignment
+
+
+ # Python writes |extra| to both the local file header and the central
+ # directory's file header. Android's zipalign tool writes only to the
+ # local file header, so there is more overhead in using python to align.
+ zip_info.extra = b'\0' * padding_needed
+
+
+def AddToZipHermetic(zip_file,
+ zip_path,
+ src_path=None,
+ data=None,
+ compress=None,
+ alignment=None):
+ """Same as build_utils.AddToZipHermetic(), but with alignment.
+
+ Args:
+ alignment: If set, align the data of the entry to this many bytes.
+ """
+ zipinfo = build_utils.HermeticZipInfo(filename=zip_path)
+ if alignment:
+ _SetAlignment(zip_file, zipinfo, alignment)
+ build_utils.AddToZipHermetic(
+ zip_file, zipinfo, src_path=src_path, data=data, compress=compress)