Add Query() support to FileRef

ppapi/proxy/ppb_file_ref_proxy.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 "ppapi/proxy/ppb_file_ref_proxy.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "ppapi/c/pp_errors.h"
@@ skipping 29 matching lines @@
   virtual PP_Resource GetParent() OVERRIDE;
   virtual int32_t MakeDirectory(
       PP_Bool make_ancestors,
       scoped_refptr<TrackedCallback> callback) OVERRIDE;
   virtual int32_t Touch(PP_Time last_access_time,
                         PP_Time last_modified_time,
                         scoped_refptr<TrackedCallback> callback) OVERRIDE;
   virtual int32_t Delete(scoped_refptr<TrackedCallback> callback) OVERRIDE;
   virtual int32_t Rename(PP_Resource new_file_ref,
                          scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t Query(PP_FileInfo* info,
+                        scoped_refptr<TrackedCallback> callback) OVERRIDE;
   virtual PP_Var GetAbsolutePath() OVERRIDE;
 
   // Executes the pending callback with the given ID. See pending_callbacks_.
-  void ExecuteCallback(int callback_id, int32_t result);
+  void ExecuteCallback(uint32_t callback_id, int32_t result);
+  void SetFileInfo(uint32_t callback_id, const PP_FileInfo& info);
 
  private:
   PluginDispatcher* GetDispatcher() const {
     return PluginDispatcher::GetForResource(this);
   }
 
   // Adds a callback to the list and returns its ID.
-  int SendCallback(scoped_refptr<TrackedCallback> callback);
+  uint32_t SendCallback(scoped_refptr<TrackedCallback> callback);
 
   // This class can have any number of out-standing requests with completion
   // callbacks, in contrast to most resources which have one possible pending
   // callback pending (like a Flush callback).
   //
   // To keep track of them, assign integer IDs to the callbacks, which is how
   // the callback will be identified when it's passed to the host and then
   // back here. Use unsigned so that overflow is well-defined.
-  unsigned int next_callback_id_;
-  typedef std::map<unsigned int,
+  uint32_t next_callback_id_;
+  typedef std::map<uint32_t,
                    scoped_refptr<TrackedCallback> > PendingCallbackMap;
   PendingCallbackMap pending_callbacks_;
 
+  // Used to keep pointers to PP_FileInfo instances that are written before
+  // callbacks are invoked. The id of a pending file info will match that of
+  // the corresponding callback.
+  typedef std::map<uint32_t, PP_FileInfo*> PendingFileInfoMap;
+  PendingFileInfoMap pending_file_infos_;
+
   DISALLOW_IMPLICIT_CONSTRUCTORS(FileRef);
 };
 
 FileRef::FileRef(const PPB_FileRef_CreateInfo& info)
     : PPB_FileRef_Shared(OBJECT_IS_PROXY, info),
       next_callback_id_(0u) {
 }
 
 FileRef::~FileRef() {
   // The callbacks map should have been cleared by LastPluginRefWasDeleted.
   DCHECK(pending_callbacks_.empty());
+  DCHECK(pending_file_infos_.empty());
 }
 
 void FileRef::LastPluginRefWasDeleted() {
   // The callback tracker will abort our callbacks for us.
   pending_callbacks_.clear();
+  pending_file_infos_.clear();
 }
 
 PP_Resource FileRef::GetParent() {
   PPB_FileRef_CreateInfo create_info;
   GetDispatcher()->Send(new PpapiHostMsg_PPBFileRef_GetParent(
       API_ID_PPB_FILE_REF, host_resource(), &create_info));
   return PPB_FileRef_Proxy::DeserializeFileRef(create_info);
 }
 
 int32_t FileRef::MakeDirectory(PP_Bool make_ancestors,
@@ skipping 26 matching lines @@
   if (!new_file_ref_object ||
       new_file_ref_object->host_resource().instance() != pp_instance())
     return PP_ERROR_BADRESOURCE;
 
   GetDispatcher()->Send(new PpapiHostMsg_PPBFileRef_Rename(
       API_ID_PPB_FILE_REF, host_resource(),
       new_file_ref_object->host_resource(), SendCallback(callback)));
   return PP_OK_COMPLETIONPENDING;
 }
 
+int32_t FileRef::Query(PP_FileInfo* info,
+                       scoped_refptr<TrackedCallback> callback) {
+  // Store the pending file info id.
+  int id = SendCallback(callback);
+  pending_file_infos_[id] = info;
+  GetDispatcher()->Send(new PpapiHostMsg_PPBFileRef_Query(
+      API_ID_PPB_FILE_REF, host_resource(), id));
+  return PP_OK_COMPLETIONPENDING;
+}
+
 PP_Var FileRef::GetAbsolutePath() {
   ReceiveSerializedVarReturnValue result;
   GetDispatcher()->Send(new PpapiHostMsg_PPBFileRef_GetAbsolutePath(
       API_ID_PPB_FILE_REF, host_resource(), &result));
   return result.Return(GetDispatcher());
 }
 
-void FileRef::ExecuteCallback(int callback_id, int32_t result) {
+void FileRef::ExecuteCallback(uint32_t callback_id, int32_t result) {
   PendingCallbackMap::iterator found = pending_callbacks_.find(callback_id);
   if (found == pending_callbacks_.end()) {
     // This will happen when the plugin deletes its resource with a pending
     // callback. The callback will be locally issued with an ABORTED call while
     // the operation may still be pending in the renderer.
     return;
   }
 
   // Executing the callback may mutate the callback list.
   scoped_refptr<TrackedCallback> callback = found->second;
   pending_callbacks_.erase(found);
   callback->Run(result);
 }
 
-int FileRef::SendCallback(scoped_refptr<TrackedCallback> callback) {
+void FileRef::SetFileInfo(uint32_t callback_id, const PP_FileInfo& info) {
+  PendingFileInfoMap::iterator found = pending_file_infos_.find(callback_id);
+  if (found == pending_file_infos_.end())
+    return;
+  PP_FileInfo* target_info = found->second;
+  *target_info = info;
+  pending_file_infos_.erase(found);
+}
+
+uint32_t FileRef::SendCallback(scoped_refptr<TrackedCallback> callback) {
   // In extreme cases the IDs may wrap around, so avoid duplicates.
   while (pending_callbacks_.count(next_callback_id_))
     ++next_callback_id_;
 
   pending_callbacks_[next_callback_id_] = callback;
   return next_callback_id_++;
 }
 
 PPB_FileRef_Proxy::PPB_FileRef_Proxy(Dispatcher* dispatcher)
     : InterfaceProxy(dispatcher),
@@ skipping 23 matching lines @@
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(PPB_FileRef_Proxy, msg)
 #if !defined(OS_NACL)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_Create, OnMsgCreate)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_GetParent, OnMsgGetParent)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_MakeDirectory,
                         OnMsgMakeDirectory)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_Touch, OnMsgTouch)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_Delete, OnMsgDelete)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_Rename, OnMsgRename)
+    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_Query, OnMsgQuery)
     IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileRef_GetAbsolutePath,
                         OnMsgGetAbsolutePath)
 #endif  // !defined(OS_NACL)
 
     IPC_MESSAGE_HANDLER(PpapiMsg_PPBFileRef_CallbackComplete,
                         OnMsgCallbackComplete)
+    IPC_MESSAGE_HANDLER(PpapiMsg_PPBFileRef_QueryCallbackComplete,
+                        OnMsgQueryCallbackComplete)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
 }
 
 // static
 void PPB_FileRef_Proxy::SerializeFileRef(PP_Resource file_ref,
                                          PPB_FileRef_CreateInfo* result) {
   EnterResourceNoLock<PPB_FileRef_API> enter(file_ref, false);
   if (enter.succeeded())
@@ skipping 24 matching lines @@
 
 void PPB_FileRef_Proxy::OnMsgGetParent(const HostResource& host_resource,
                                        PPB_FileRef_CreateInfo* result) {
   EnterHostFromHostResource<PPB_FileRef_API> enter(host_resource);
   if (enter.succeeded())
     SerializeFileRef(enter.object()->GetParent(), result);
 }
 
 void PPB_FileRef_Proxy::OnMsgMakeDirectory(const HostResource& host_resource,
                                            PP_Bool make_ancestors,
-                                           int callback_id) {
+                                           uint32_t callback_id) {
   EnterHostFromHostResourceForceCallback<PPB_FileRef_API> enter(
       host_resource, callback_factory_,
       &PPB_FileRef_Proxy::OnCallbackCompleteInHost, host_resource, callback_id);
   if (enter.succeeded()) {
     enter.SetResult(enter.object()->MakeDirectory(make_ancestors,
                                                   enter.callback()));
   }
 }
 
 void PPB_FileRef_Proxy::OnMsgTouch(const HostResource& host_resource,
                                    PP_Time last_access,
                                    PP_Time last_modified,
-                                   int callback_id) {
+                                   uint32_t callback_id) {
   EnterHostFromHostResourceForceCallback<PPB_FileRef_API> enter(
       host_resource, callback_factory_,
       &PPB_FileRef_Proxy::OnCallbackCompleteInHost, host_resource, callback_id);
   if (enter.succeeded()) {
     enter.SetResult(enter.object()->Touch(last_access, last_modified,
                                           enter.callback()));
   }
 }
 
 void PPB_FileRef_Proxy::OnMsgDelete(const HostResource& host_resource,
-                                    int callback_id) {
+                                    uint32_t callback_id) {
   EnterHostFromHostResourceForceCallback<PPB_FileRef_API> enter(
       host_resource, callback_factory_,
       &PPB_FileRef_Proxy::OnCallbackCompleteInHost, host_resource, callback_id);
   if (enter.succeeded())
     enter.SetResult(enter.object()->Delete(enter.callback()));
 }
 
 void PPB_FileRef_Proxy::OnMsgRename(const HostResource& file_ref,
                                     const HostResource& new_file_ref,
-                                    int callback_id) {
+                                    uint32_t callback_id) {
   EnterHostFromHostResourceForceCallback<PPB_FileRef_API> enter(
       file_ref, callback_factory_,
       &PPB_FileRef_Proxy::OnCallbackCompleteInHost, file_ref, callback_id);
   if (enter.succeeded()) {
     enter.SetResult(enter.object()->Rename(new_file_ref.host_resource(),
                                            enter.callback()));
   }
 }
 
+void PPB_FileRef_Proxy::OnMsgQuery(const HostResource& file_ref,
+                                   uint32_t callback_id) {
+  PP_FileInfo* info = new PP_FileInfo();
+  // Zero-initialize so we don't have garbage in the failure case.
+  memset(info, 0, sizeof(PP_FileInfo));

[yzshen1, 2013/03/26 23:32:42]

You have run the default constructor on the previous line, right?
("new PP_FileInfo()" does init while "new PP_FileInfo" doesn't.)

+  EnterHostFromHostResourceForceCallback<PPB_FileRef_API> enter(
+      file_ref, callback_factory_,
+      &PPB_FileRef_Proxy::OnQueryCallbackCompleteInHost, file_ref,
+      base::Owned(info), callback_id);
+  if (enter.succeeded())
+    enter.SetResult(enter.object()->Query(info, enter.callback()));
+}
+
 void PPB_FileRef_Proxy::OnMsgGetAbsolutePath(const HostResource& host_resource,
                                              SerializedVarReturnValue result) {
   EnterHostFromHostResource<PPB_FileRef_API> enter(host_resource);
   if (enter.succeeded())
     result.Return(dispatcher(), enter.object()->GetAbsolutePath());
 }
 #endif  // !defined(OS_NACL)
 
 void PPB_FileRef_Proxy::OnMsgCallbackComplete(
     const HostResource& host_resource,
-    int callback_id,
+    uint32_t callback_id,
     int32_t result) {
   // Forward the callback info to the plugin resource.
   EnterPluginFromHostResource<PPB_FileRef_API> enter(host_resource);
   if (enter.succeeded())
     static_cast<FileRef*>(enter.object())->ExecuteCallback(callback_id, result);
 }
 
+void PPB_FileRef_Proxy::OnMsgQueryCallbackComplete(
+    const HostResource& host_resource,
+    const PP_FileInfo& info,
+    uint32_t callback_id,
+    int32_t result) {
+  EnterPluginFromHostResource<PPB_FileRef_API> enter(host_resource);
+  if (enter.succeeded()) {
+    // Set the FileInfo output parameter.
+    static_cast<FileRef*>(enter.object())->SetFileInfo(callback_id, info);
+    static_cast<FileRef*>(enter.object())->ExecuteCallback(callback_id, result);
+  }
+}
+
 #if !defined(OS_NACL)
 void PPB_FileRef_Proxy::OnCallbackCompleteInHost(
     int32_t result,
     const HostResource& host_resource,
-    int callback_id) {
+    uint32_t callback_id) {
   // Execute OnMsgCallbackComplete in the plugin process.
   Send(new PpapiMsg_PPBFileRef_CallbackComplete(
       API_ID_PPB_FILE_REF, host_resource, callback_id, result));
 }
+
+void PPB_FileRef_Proxy::OnQueryCallbackCompleteInHost(
+    int32_t result,
+    const HostResource& host_resource,
+    base::internal::OwnedWrapper<PP_FileInfo> info,
+    uint32_t callback_id) {
+  Send(new PpapiMsg_PPBFileRef_QueryCallbackComplete(
+      API_ID_PPB_FILE_REF, host_resource, *info.get(), callback_id, result));
+}
 #endif  // !defined(OS_NACL)
 
 }  // namespace proxy
 }  // namespace ppapi