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diff --git a/media/libaom/src/tools/lint-hunks.py b/media/libaom/src/tools/lint-hunks.py
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+#!/usr/bin/python
+##
+## Copyright (c) 2016, Alliance for Open Media. All rights reserved
+##
+## This source code is subject to the terms of the BSD 2 Clause License and
+## the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
+## was not distributed with this source code in the LICENSE file, you can
+## obtain it at www.aomedia.org/license/software. If the Alliance for Open
+## Media Patent License 1.0 was not distributed with this source code in the
+## PATENTS file, you can obtain it at www.aomedia.org/license/patent.
+##
+"""Performs style checking on each diff hunk."""
+import getopt
+import os
+import StringIO
+import subprocess
+import sys
+
+import diff
+
+
+SHORT_OPTIONS = "h"
+LONG_OPTIONS = ["help"]
+
+TOPLEVEL_CMD = ["git", "rev-parse", "--show-toplevel"]
+DIFF_CMD = ["git", "diff"]
+DIFF_INDEX_CMD = ["git", "diff-index", "-u", "HEAD", "--"]
+SHOW_CMD = ["git", "show"]
+CPPLINT_FILTERS = ["-readability/casting"]
+
+
+class Usage(Exception):
+ pass
+
+
+class SubprocessException(Exception):
+ def __init__(self, args):
+ msg = "Failed to execute '%s'"%(" ".join(args))
+ super(SubprocessException, self).__init__(msg)
+
+
+class Subprocess(subprocess.Popen):
+ """Adds the notion of an expected returncode to Popen."""
+
+ def __init__(self, args, expected_returncode=0, **kwargs):
+ self._args = args
+ self._expected_returncode = expected_returncode
+ super(Subprocess, self).__init__(args, **kwargs)
+
+ def communicate(self, *args, **kwargs):
+ result = super(Subprocess, self).communicate(*args, **kwargs)
+ if self._expected_returncode is not None:
+ try:
+ ok = self.returncode in self._expected_returncode
+ except TypeError:
+ ok = self.returncode == self._expected_returncode
+ if not ok:
+ raise SubprocessException(self._args)
+ return result
+
+
+def main(argv=None):
+ if argv is None:
+ argv = sys.argv
+ try:
+ try:
+ opts, args = getopt.getopt(argv[1:], SHORT_OPTIONS, LONG_OPTIONS)
+ except getopt.error, msg:
+ raise Usage(msg)
+
+ # process options
+ for o, _ in opts:
+ if o in ("-h", "--help"):
+ print __doc__
+ sys.exit(0)
+
+ if args and len(args) > 1:
+ print __doc__
+ sys.exit(0)
+
+ # Find the fully qualified path to the root of the tree
+ tl = Subprocess(TOPLEVEL_CMD, stdout=subprocess.PIPE)
+ tl = tl.communicate()[0].strip()
+
+ # See if we're working on the index or not.
+ if args:
+ diff_cmd = DIFF_CMD + [args[0] + "^!"]
+ else:
+ diff_cmd = DIFF_INDEX_CMD
+
+ # Build the command line to execute cpplint
+ cpplint_cmd = [os.path.join(tl, "tools", "cpplint.py"),
+ "--filter=" + ",".join(CPPLINT_FILTERS),
+ "-"]
+
+ # Get a list of all affected lines
+ file_affected_line_map = {}
+ p = Subprocess(diff_cmd, stdout=subprocess.PIPE)
+ stdout = p.communicate()[0]
+ for hunk in diff.ParseDiffHunks(StringIO.StringIO(stdout)):
+ filename = hunk.right.filename[2:]
+ if filename not in file_affected_line_map:
+ file_affected_line_map[filename] = set()
+ file_affected_line_map[filename].update(hunk.right.delta_line_nums)
+
+ # Run each affected file through cpplint
+ lint_failed = False
+ for filename, affected_lines in file_affected_line_map.iteritems():
+ if filename.split(".")[-1] not in ("c", "h", "cc"):
+ continue
+
+ if args:
+ # File contents come from git
+ show_cmd = SHOW_CMD + [args[0] + ":" + filename]
+ show = Subprocess(show_cmd, stdout=subprocess.PIPE)
+ lint = Subprocess(cpplint_cmd, expected_returncode=(0, 1),
+ stdin=show.stdout, stderr=subprocess.PIPE)
+ lint_out = lint.communicate()[1]
+ else:
+ # File contents come from the working tree
+ lint = Subprocess(cpplint_cmd, expected_returncode=(0, 1),
+ stdin=subprocess.PIPE, stderr=subprocess.PIPE)
+ stdin = open(os.path.join(tl, filename)).read()
+ lint_out = lint.communicate(stdin)[1]
+
+ for line in lint_out.split("\n"):
+ fields = line.split(":")
+ if fields[0] != "-":
+ continue
+ warning_line_num = int(fields[1])
+ if warning_line_num in affected_lines:
+ print "%s:%d:%s"%(filename, warning_line_num,
+ ":".join(fields[2:]))
+ lint_failed = True
+
+ # Set exit code if any relevant lint errors seen
+ if lint_failed:
+ return 1
+
+ except Usage, err:
+ print >>sys.stderr, err
+ print >>sys.stderr, "for help use --help"
+ return 2
+
+if __name__ == "__main__":
+ sys.exit(main())