The Tor Browser: ipc/chromium/src/base/path_service.cc@6474c204b198 (annotated)

ipc/chromium/src/base/path_service.cc@6474c204b198 (annotated)

ipc/chromium/src/base/path_service.cc

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 // Copyright (c) 2006-2008 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 "base/path_service.h"
 #ifdef OS_WIN
 #include <windows.h>
 #include <shellapi.h>
 #include <shlobj.h>
 #endif
 #include "base/file_path.h"
 #include "base/file_util.h"
 #include "base/hash_tables.h"
 #include "base/lock.h"
 #include "base/logging.h"
 #include "base/singleton.h"
 #include "base/string_util.h"
 namespace base {
   bool PathProvider(int key, FilePath* result);
 #if defined(OS_WIN)
   bool PathProviderWin(int key, FilePath* result);
 #elif defined(OS_MACOSX)
   bool PathProviderMac(int key, FilePath* result);
 #elif defined(OS_LINUX)
   bool PathProviderLinux(int key, FilePath* result);
 #endif
 }
 namespace {
 typedef base::hash_map<int, FilePath> PathMap;
 typedef base::hash_set<int> PathSet;
 // We keep a linked list of providers.  In a debug build we ensure that no two
 // providers claim overlapping keys.
 struct Provider {
   PathService::ProviderFunc func;
   struct Provider* next;
 #ifndef NDEBUG
   int key_start;
   int key_end;
 #endif
   bool is_static;
 };
 static Provider base_provider = {
   base::PathProvider,
   NULL,
 #ifndef NDEBUG
   base::PATH_START,
   base::PATH_END,
 #endif
   true
 };
 #ifdef OS_WIN
 static Provider base_provider_win = {
   base::PathProviderWin,
   &base_provider,
 #ifndef NDEBUG
   base::PATH_WIN_START,
   base::PATH_WIN_END,
 #endif
   true
 };
 #endif
 #ifdef OS_MACOSX
 static Provider base_provider_mac = {
   base::PathProviderMac,
   &base_provider,
 #ifndef NDEBUG
   base::PATH_MAC_START,
   base::PATH_MAC_END,
 #endif
   true
 };
 #endif
 #if defined(OS_LINUX)
 static Provider base_provider_linux = {
   base::PathProviderLinux,
   &base_provider,
 #ifndef NDEBUG
   base::PATH_LINUX_START,
   base::PATH_LINUX_END,
 #endif
   true
 };
 #endif
 struct PathData {
   Lock      lock;
   PathMap   cache;      // Track mappings from path key to path value.
   PathSet   overrides;  // Track whether a path has been overridden.
   Provider* providers;  // Linked list of path service providers.
   PathData() {
 #if defined(OS_WIN)
     providers = &base_provider_win;
 #elif defined(OS_MACOSX)
     providers = &base_provider_mac;
 #elif defined(OS_LINUX)
     providers = &base_provider_linux;
 #endif
   }
   ~PathData() {
     Provider* p = providers;
     while (p) {
       Provider* next = p->next;
       if (!p->is_static)
         delete p;
       p = next;
     }
   }
 };
 static PathData* GetPathData() {
   return Singleton<PathData>::get();
 }
 }  // namespace
 // static
 bool PathService::GetFromCache(int key, FilePath* result) {
   PathData* path_data = GetPathData();
   AutoLock scoped_lock(path_data->lock);
   // check for a cached version
   PathMap::const_iterator it = path_data->cache.find(key);
   if (it != path_data->cache.end()) {
     *result = it->second;
     return true;
   }
   return false;
 }
 // static
 void PathService::AddToCache(int key, const FilePath& path) {
   PathData* path_data = GetPathData();
   AutoLock scoped_lock(path_data->lock);
   // Save the computed path in our cache.
   path_data->cache[key] = path;
 }
 // TODO(brettw): this function does not handle long paths (filename > MAX_PATH)
 // characters). This isn't supported very well by Windows right now, so it is
 // moot, but we should keep this in mind for the future.
 // static
 bool PathService::Get(int key, FilePath* result) {
   PathData* path_data = GetPathData();
   DCHECK(path_data);
   DCHECK(result);
   DCHECK(key >= base::DIR_CURRENT);
   // special case the current directory because it can never be cached
   if (key == base::DIR_CURRENT)
     return file_util::GetCurrentDirectory(result);
   if (GetFromCache(key, result))
     return true;
   FilePath path;
   // search providers for the requested path
   // NOTE: it should be safe to iterate here without the lock
   // since RegisterProvider always prepends.
   Provider* provider = path_data->providers;
   while (provider) {
     if (provider->func(key, &path))
       break;
     DCHECK(path.empty()) << "provider should not have modified path";
     provider = provider->next;
   }
   if (path.empty())
     return false;
   AddToCache(key, path);
   *result = path;
   return true;
 }
 // static
 bool PathService::Get(int key, std::wstring* result) {
   // Deprecated compatibility function.
   FilePath path;
   if (!Get(key, &path))
     return false;
   *result = path.ToWStringHack();
   return true;
 }
 bool PathService::IsOverridden(int key) {
   PathData* path_data = GetPathData();
   DCHECK(path_data);
   AutoLock scoped_lock(path_data->lock);
   return path_data->overrides.find(key) != path_data->overrides.end();
 }
 bool PathService::Override(int key, const std::wstring& path) {
   PathData* path_data = GetPathData();
   DCHECK(path_data);
   DCHECK(key > base::DIR_CURRENT) << "invalid path key";
   std::wstring file_path = path;
 #if defined(OS_WIN)
   // On Windows we switch the current working directory to load plugins (at
   // least). That's not the case on POSIX.
   // Also, on POSIX, AbsolutePath fails if called on a non-existant path.
   if (!file_util::AbsolutePath(&file_path))
     return false;
 #endif
   // make sure the directory exists:
   if (!file_util::CreateDirectory(file_path))
     return false;
   file_util::TrimTrailingSeparator(&file_path);
   AutoLock scoped_lock(path_data->lock);
   path_data->cache[key] = FilePath::FromWStringHack(file_path);
   path_data->overrides.insert(key);
   return true;
 }
 bool PathService::SetCurrentDirectory(const std::wstring& current_directory) {
   return file_util::SetCurrentDirectory(current_directory);
 }
 void PathService::RegisterProvider(ProviderFunc func, int key_start,
                                    int key_end) {
   PathData* path_data = GetPathData();
   DCHECK(path_data);
   DCHECK(key_end > key_start);
   AutoLock scoped_lock(path_data->lock);
   Provider* p;
 #ifndef NDEBUG
   p = path_data->providers;
   while (p) {
     DCHECK(key_start >= p->key_end || key_end <= p->key_start) <<
       "path provider collision";
     p = p->next;
   }
 #endif
   p = new Provider;
   p->is_static = false;
   p->func = func;
   p->next = path_data->providers;
 #ifndef NDEBUG
   p->key_start = key_start;
   p->key_end = key_end;
 #endif
   path_data->providers = p;
 }

The Tor Browser / annotate

ipc/chromium/src/base/path_service.cc@6474c204b198 (annotated)

ipc/chromium/src/base/path_service.cc