1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 // 5 6 #include "chrome/installer/util/duplicate_tree_detector.h" 7 8 #include "base/file_util.h" 9 #include "base/files/file_enumerator.h" 10 #include "base/logging.h" 11 12 namespace installer { 13 14 bool IsIdenticalFileHierarchy(const base::FilePath& src_path, 15 const base::FilePath& dest_path) { 16 base::PlatformFileInfo src_info; 17 base::PlatformFileInfo dest_info; 18 19 bool is_identical = false; 20 if (file_util::GetFileInfo(src_path, &src_info) && 21 file_util::GetFileInfo(dest_path, &dest_info)) { 22 // Both paths exist, check the types: 23 if (!src_info.is_directory && !dest_info.is_directory) { 24 // Two files are "identical" if the file sizes are equivalent. 25 is_identical = src_info.size == dest_info.size; 26 #ifndef NDEBUG 27 // For Debug builds, also check last modification time (to make sure 28 // version dir DLLs are replaced on over-install even if the tested change 29 // doesn't happen to change a given DLL's size). 30 if (is_identical) 31 is_identical = (src_info.last_modified == dest_info.last_modified); 32 #endif 33 } else if (src_info.is_directory && dest_info.is_directory) { 34 // Two directories are "identical" if dest_path contains entries that are 35 // "identical" to all the entries in src_path. 36 is_identical = true; 37 38 base::FileEnumerator path_enum(src_path, false /* not recursive */, 39 base::FileEnumerator::FILES | base::FileEnumerator::DIRECTORIES); 40 for (base::FilePath path = path_enum.Next(); 41 is_identical && !path.empty(); 42 path = path_enum.Next()) { 43 is_identical = 44 IsIdenticalFileHierarchy(path, dest_path.Append(path.BaseName())); 45 } 46 } else { 47 // The two paths are of different types, so they cannot be identical. 48 DCHECK(!is_identical); 49 } 50 } 51 52 return is_identical; 53 } 54 55 } // namespace installer 56
