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// Copyright (c) 2011 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.
//
#include "chrome/installer/util/duplicate_tree_detector.h"
#include "base/file_util.h"
#include "base/logging.h"
namespace installer {
bool IsIdenticalFileHierarchy(const base::FilePath& src_path,
const base::FilePath& dest_path) {
using file_util::FileEnumerator;
base::PlatformFileInfo src_info;
base::PlatformFileInfo dest_info;
bool is_identical = false;
if (file_util::GetFileInfo(src_path, &src_info) &&
file_util::GetFileInfo(dest_path, &dest_info)) {
// Both paths exist, check the types:
if (!src_info.is_directory && !dest_info.is_directory) {
// Two files are "identical" if the file sizes are equivalent.
is_identical = src_info.size == dest_info.size;
#ifndef NDEBUG
// For Debug builds, also check last modification time (to make sure
// version dir DLLs are replaced on over-install even if the tested change
// doesn't happen to change a given DLL's size).
if (is_identical)
is_identical = (src_info.last_modified == dest_info.last_modified);
#endif
} else if (src_info.is_directory && dest_info.is_directory) {
// Two directories are "identical" if dest_path contains entries that are
// "identical" to all the entries in src_path.
is_identical = true;
FileEnumerator path_enum(src_path, false /* not recursive */,
FileEnumerator::FILES | FileEnumerator::DIRECTORIES);
for (base::FilePath path = path_enum.Next();
is_identical && !path.empty();
path = path_enum.Next()) {
is_identical =
IsIdenticalFileHierarchy(path, dest_path.Append(path.BaseName()));
}
} else {
// The two paths are of different types, so they cannot be identical.
DCHECK(!is_identical);
}
}
return is_identical;
}
} // namespace installer
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