AU: delta compress the kernel partition

src/platform/update_engine/test_utils.cc

 // Copyright (c) 2009 The Chromium OS Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "update_engine/test_utils.h"
 
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <errno.h>
 #include <stdio.h>
@@ skipping 17 matching lines @@
 namespace chromeos_update_engine {
 
 bool WriteFileVector(const std::string& path, const std::vector<char>& data) {
   return utils::WriteFile(path.c_str(), &data[0], data.size());
 }
 
 bool WriteFileString(const std::string& path, const std::string& data) {
   return utils::WriteFile(path.c_str(), data.data(), data.size());
 }
 
-off_t FileSize(const string& path) {
-  struct stat stbuf;
-  int rc = stat(path.c_str(), &stbuf);
-  CHECK_EQ(rc, 0);
-  if (rc < 0)
-    return rc;
-  return stbuf.st_size;
-}
-
 std::string Readlink(const std::string& path) {
   vector<char> buf(PATH_MAX + 1);
   ssize_t r = readlink(path.c_str(), &buf[0], buf.size());
   if (r < 0)
     return "";
   CHECK_LT(r, static_cast<ssize_t>(buf.size()));
   buf.resize(r);
   string ret;
   ret.insert(ret.begin(), buf.begin(), buf.end());
   return ret;
@@ skipping 209 matching lines @@
   EXPECT_TRUE(expected_paths.empty());
   if (!expected_paths.empty()) {
     for (set<string>::const_iterator it = expected_paths.begin();
          it != expected_paths.end(); ++it) {
       LOG(INFO) << "extra path: " << *it;
     }
   }
 }
 
 }  // namespace chromeos_update_engine