gdata: Support mounting archive files in GData cache.

chrome/browser/chromeos/gdata/gdata_util.cc

 // Copyright (c) 2012 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/browser/chromeos/gdata/gdata_util.h"
 
 #include <string>
 #include <vector>
 #include <utility>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/json/json_reader.h"
 #include "base/logging.h"
 #include "base/stringprintf.h"
+#include "base/string_util.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/common/chrome_version_info.h"
 #include "chrome/common/libxml_utils.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/browser/chromeos/gdata/gdata_file_system.h"
 #include "chrome/browser/chromeos/gdata/gdata_system_service.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 185 matching lines @@
       kReadOnlyFilePermissions));
   // TODO(tbarzic): When we start supporting openFile operation, we may have to
   // change permission for localy modified files to match handler's permissions.
   cache_paths->push_back(std::make_pair(
       file_system->GetCacheFilePath(resource_id, file_md5,
           GDataRootDirectory::CACHE_TYPE_PERSISTENT,
           GDataFileSystem::CACHED_FILE_LOCALLY_MODIFIED),
      kReadOnlyFilePermissions));
   cache_paths->push_back(std::make_pair(
       file_system->GetCacheFilePath(resource_id, file_md5,
+          GDataRootDirectory::CACHE_TYPE_PERSISTENT,
+          GDataFileSystem::CACHED_FILE_MOUNTED),
+     kReadOnlyFilePermissions));
+  cache_paths->push_back(std::make_pair(
+      file_system->GetCacheFilePath(resource_id, file_md5,
           GDataRootDirectory::CACHE_TYPE_TMP,
           GDataFileSystem::CACHED_FILE_FROM_SERVER),
       kReadOnlyFilePermissions));
 
 }
 
 void SetPermissionsForGDataCacheFiles(Profile* profile,
                                       int pid,
                                       const FilePath& path) {
   std::vector<std::pair<FilePath, int> > cache_paths;
@@ skipping 18 matching lines @@
 
   // Disable gdata if preference is set.  This can happen with commandline flag
   // --disable-gdata or enterprise policy, or probably with user settings too
   // in the future.
   if (profile->GetPrefs()->GetBoolean(prefs::kDisableGData))
     return false;
 
   return true;
 }
 
+std::string EscapeCacheFileName(const std::string& filename) {
+  // This is based on net/base/escape.cc: net::(anonymous namespace)::Escape
+  const char kHexString[] = "0123456789ABCDEF";
+  std::string escaped;
+  for (unsigned int i = 0; i < filename.length(); ++i) {

[satorux1, 2012/04/23 21:02:25]

unsigned int -> size_t

length() -> size() - size() is more common.

[hshi, 2012/04/23 22:01:23]

Done.

+    unsigned char c = static_cast<unsigned char>(filename[i]);
+    if (c == '%' || c == '.' || c == '/') {
+      escaped.push_back('%');
+      escaped.push_back(kHexString[c >> 4]);
+      escaped.push_back(kHexString[c & 0xf]);

[satorux1, 2012/04/23 21:02:25]

base::StringAppendF(&escaped, "%%%02X", c) may be a bit simpler.

[hshi, 2012/04/23 22:01:23]

Done.

+    } else {
+      escaped.push_back(c);
+    }
+  }
+  return escaped;
+}
+
+std::string UnescapeCacheFileName(const std::string& filename) {
+  std::string unescaped;
+  for (unsigned int i = 0; i < filename.length(); ++i) {

[satorux1, 2012/04/23 21:02:25]

size_t and size()

[hshi, 2012/04/23 22:01:23]

Done.

+    unsigned char c = static_cast<unsigned char>(filename[i]);

[satorux1, 2012/04/23 21:02:25]

you probably don't need to cast this to unsigned.

[hshi, 2012/04/23 22:01:23]

Done.

+    if (c == '%' && i + 2 < filename.length()) {
+      c = (HexDigitToInt(filename[i + 1]) << 4) +
+          HexDigitToInt(filename[i + 2]);

[satorux1, 2012/04/23 21:02:25]

one more space to align two lines vertically?

[hshi, 2012/04/23 22:01:23]

Done.

+      i += 2;
+    }
+    unescaped.push_back(c);
+  }
+  return unescaped;
+}
+
+void ParseCacheFilePath(const FilePath& path,
+                        std::string* resource_id,
+                        std::string* md5,
+                        std::string* extra_extension) {
+  DCHECK(resource_id);
+  DCHECK(md5);
+  DCHECK(extra_extension);
+
+  // Extract up to two extensions from the right.
+  FilePath base_name = path.BaseName();
+  const int kNumExtensionsToExtract = 2;
+  std::vector<FilePath::StringType> extensions;
+  for (int i = 0; i < kNumExtensionsToExtract; ++i) {
+    FilePath::StringType extension = base_name.Extension();
+    if (!extension.empty()) {
+      // FilePath::Extension returns ".", so strip it.
+      extension = UnescapeCacheFileName(extension.substr(1));
+      base_name = base_name.RemoveExtension();
+      extensions.push_back(extension);
+    } else {
+      break;
+    }
+  }
+
+  // The base_name here is already stripped of extensions in the loop above.
+  *resource_id = UnescapeCacheFileName(base_name.value());
+
+  // Assign the extracted extensions to md5 and extra_extension.
+  int extension_count = extensions.size();
+  *md5 = (extension_count > 0) ? extensions[extension_count - 1] :
+                                 std::string();
+  *extra_extension = (extension_count > 1) ? extensions[extension_count - 2] :
+                                             std::string();
+}
+
 }  // namespace util
 }  // namespace gdata