Create offline_url_utils

ios/chrome/browser/reading_list/offline_url_utils.cc

Index: ios/chrome/browser/reading_list/offline_url_utils.cc
diff --git a/ios/chrome/browser/reading_list/offline_url_utils.cc b/ios/chrome/browser/reading_list/offline_url_utils.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cc7d044c493471a1f3a008333b9648f87249bac1
--- /dev/null
+++ b/ios/chrome/browser/reading_list/offline_url_utils.cc
@@ -0,0 +1,67 @@
+// Copyright 2016 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 "ios/chrome/browser/reading_list/offline_url_utils.h"
+
+#include "base/md5.h"
+#include "base/strings/stringprintf.h"
+#include "ios/chrome/browser/chrome_url_constants.h"
+
+namespace {
+const char kOfflineDirectory[] = "Offline";
+const char kMainPageFileName[] = "page.html";
+}  // namespace
+
+namespace reading_list {
+
+base::FilePath OfflineRootDirectoryPath(const base::FilePath& profile_path) {
+  return profile_path.Append(FILE_PATH_LITERAL(kOfflineDirectory));
+}
+
+std::string OfflineURLDirectoryID(const GURL& url) {
+  return base::MD5String(url.spec());
+}
+
+base::FilePath OfflinePagePath(const GURL& url) {
+  base::FilePath directory(OfflineURLDirectoryID(url));
+  return directory.Append(FILE_PATH_LITERAL(kMainPageFileName));
+}
+
+base::FilePath OfflineURLDirectoryAbsolutePath(
+    const base::FilePath& profile_path,
+    const GURL& url) {
+  return OfflineRootDirectoryPath(profile_path)
+      .Append(OfflineURLDirectoryID(url));
+}
+
+base::FilePath OfflinePageAbsolutePath(const base::FilePath& profile_path,
+                                       const GURL& url) {
+  return OfflineRootDirectoryPath(profile_path).Append(OfflinePagePath(url));
+}
+
+GURL DistilledURLForPath(const base::FilePath& distilled_path) {
+  if (distilled_path.empty()) {
+    return GURL();
+  }
+  return GURL(kChromeUIOfflineURL + distilled_path.value());
+}
+
+GURL FileURLForDistilledURL(const GURL& distilled_url,
+                            const base::FilePath& profile_path,
+                            GURL* resources_root_url) {
+  if (!distilled_url.is_valid()) {
+    return GURL();
+  }
+  DCHECK(distilled_url.SchemeIs(kChromeUIScheme));
+  base::FilePath offline_path = profile_path.AppendASCII(kOfflineDirectory);
+
+  GURL file_url(base::StringPrintf("%s%s", url::kFileScheme,
+                                   url::kStandardSchemeSeparator) +
+                offline_path.value() + distilled_url.path());
+  if (resources_root_url) {
+    *resources_root_url = file_url.Resolve(".");
+  }
+  return file_url;
+}
+}