Revert 113656 - Implement a proxy for Pepper FileIO.

ppapi/proxy/ppb_file_io_proxy.cc

Index: ppapi/proxy/ppb_file_io_proxy.cc
===================================================================
--- ppapi/proxy/ppb_file_io_proxy.cc	(revision 113658)
+++ ppapi/proxy/ppb_file_io_proxy.cc	(working copy)
@@ -1,442 +0,0 @@
-// 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 "ppapi/proxy/ppb_file_io_proxy.h"
-
-#include "ppapi/c/pp_errors.h"
-#include "ppapi/proxy/enter_proxy.h"
-#include "ppapi/proxy/ppapi_messages.h"
-#include "ppapi/proxy/ppb_file_ref_proxy.h"
-#include "ppapi/shared_impl/ppapi_globals.h"
-#include "ppapi/shared_impl/ppb_file_io_shared.h"
-#include "ppapi/shared_impl/resource.h"
-#include "ppapi/shared_impl/resource_tracker.h"
-
-using ppapi::thunk::PPB_FileIO_API;
-using ppapi::thunk::PPB_FileRef_API;
-
-namespace ppapi {
-namespace proxy {
-
-namespace {
-
-// The maximum size we'll support reading in one chunk. The renderer process
-// must allocate a buffer sized according to the request of the plugin. To
-// keep things from getting out of control, we cap the read size to this value.
-// This should generally be OK since the API specifies that it may perform a
-// partial read.
-static const int32_t kMaxReadSize = 33554432;  // 32MB
-
-typedef EnterHostFromHostResourceForceCallback<PPB_FileIO_API> EnterHostFileIO;
-typedef EnterPluginFromHostResource<PPB_FileIO_API> EnterPluginFileIO;
-
-class FileIO : public PPB_FileIO_Shared {
- public:
-  explicit FileIO(const HostResource& host_resource);
-  virtual ~FileIO();
-
-  // PPB_FileIO_API implementation (not provided by FileIOImpl).
-  virtual void Close() OVERRIDE;
-  virtual int32_t GetOSFileDescriptor() OVERRIDE;
-  virtual int32_t WillWrite(int64_t offset,
-                            int32_t bytes_to_write,
-                            PP_CompletionCallback callback) OVERRIDE;
-  virtual int32_t WillSetLength(int64_t length,
-                                PP_CompletionCallback callback) OVERRIDE;
-
- private:
-  // FileIOImpl overrides.
-  virtual int32_t OpenValidated(PP_Resource file_ref_resource,
-                                PPB_FileRef_API* file_ref_api,
-                                int32_t open_flags,
-                                PP_CompletionCallback callback) OVERRIDE;
-  virtual int32_t QueryValidated(PP_FileInfo* info,
-                                 PP_CompletionCallback callback) OVERRIDE;
-  virtual int32_t TouchValidated(PP_Time last_access_time,
-                                 PP_Time last_modified_time,
-                                 PP_CompletionCallback callback) OVERRIDE;
-  virtual int32_t ReadValidated(int64_t offset,
-                                char* buffer,
-                                int32_t bytes_to_read,
-                                PP_CompletionCallback callback) OVERRIDE;
-  virtual int32_t WriteValidated(int64_t offset,
-                                 const char* buffer,
-                                 int32_t bytes_to_write,
-                                 PP_CompletionCallback callback) OVERRIDE;
-  virtual int32_t SetLengthValidated(int64_t length,
-                                     PP_CompletionCallback callback) OVERRIDE;
-  virtual int32_t FlushValidated(PP_CompletionCallback callback) OVERRIDE;
-
-  PluginDispatcher* GetDispatcher() const {
-    return PluginDispatcher::GetForResource(this);
-  }
-
-  static const ApiID kApiID = API_ID_PPB_FILE_IO;
-
-  DISALLOW_IMPLICIT_CONSTRUCTORS(FileIO);
-};
-
-FileIO::FileIO(const HostResource& host_resource)
-    : PPB_FileIO_Shared(host_resource) {
-}
-
-FileIO::~FileIO() {
-  Close();
-}
-
-void FileIO::Close() {
-  if (file_open_) {
-    GetDispatcher()->Send(new PpapiHostMsg_PPBFileIO_Close(kApiID,
-                                                           host_resource()));
-  }
-}
-
-int32_t FileIO::GetOSFileDescriptor() {
-  return -1;
-}
-
-int32_t FileIO::WillWrite(int64_t offset,
-                          int32_t bytes_to_write,
-                          PP_CompletionCallback callback) {
-  GetDispatcher()->Send(new PpapiHostMsg_PPBFileIO_WillWrite(
-      kApiID, host_resource(), offset, bytes_to_write));
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
-  return PP_OK_COMPLETIONPENDING;
-}
-
-int32_t FileIO::WillSetLength(int64_t length,
-                              PP_CompletionCallback callback) {
-  GetDispatcher()->Send(new PpapiHostMsg_PPBFileIO_WillSetLength(
-      kApiID, host_resource(), length));
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
-  return PP_OK_COMPLETIONPENDING;
-}
-
-int32_t FileIO::OpenValidated(PP_Resource file_ref_resource,
-                              PPB_FileRef_API* file_ref_api,
-                              int32_t open_flags,
-                              PP_CompletionCallback callback) {
-  Resource* file_ref_object =
-      PpapiGlobals::Get()->GetResourceTracker()->GetResource(file_ref_resource);
-
-  GetDispatcher()->Send(new PpapiHostMsg_PPBFileIO_Open(
-      kApiID, host_resource(), file_ref_object->host_resource(), open_flags));
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
-  return PP_OK_COMPLETIONPENDING;
-}
-
-int32_t FileIO::QueryValidated(PP_FileInfo* info,
-                               PP_CompletionCallback callback) {
-  GetDispatcher()->Send(new PpapiHostMsg_PPBFileIO_Query(
-      kApiID, host_resource()));
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, info);
-  return PP_OK_COMPLETIONPENDING;
-}
-
-int32_t FileIO::TouchValidated(PP_Time last_access_time,
-                               PP_Time last_modified_time,
-                               PP_CompletionCallback callback) {
-  GetDispatcher()->Send(new PpapiHostMsg_PPBFileIO_Touch(
-      kApiID, host_resource(), last_access_time, last_modified_time));
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
-  return PP_OK_COMPLETIONPENDING;
-}
-
-int32_t FileIO::ReadValidated(int64_t offset,
-                              char* buffer,
-                              int32_t bytes_to_read,
-                              PP_CompletionCallback callback) {
-  GetDispatcher()->Send(new PpapiHostMsg_PPBFileIO_Read(
-      kApiID, host_resource(), offset, bytes_to_read));
-  RegisterCallback(OPERATION_READ, callback, buffer, NULL);
-  return PP_OK_COMPLETIONPENDING;
-}
-
-int32_t FileIO::WriteValidated(int64_t offset,
-                               const char* buffer,
-                               int32_t bytes_to_write,
-                               PP_CompletionCallback callback) {
-  // TODO(brettw) it would be nice to use a shared memory buffer for large
-  // writes rather than having to copy to a string (which will involve a number
-  // of extra copies to serialize over IPC).
-  GetDispatcher()->Send(new PpapiHostMsg_PPBFileIO_Write(
-      kApiID, host_resource(), offset, std::string(buffer, bytes_to_write)));
-  RegisterCallback(OPERATION_WRITE, callback, NULL, NULL);
-  return PP_OK_COMPLETIONPENDING;
-}
-
-int32_t FileIO::SetLengthValidated(int64_t length,
-                                   PP_CompletionCallback callback) {
-  GetDispatcher()->Send(new PpapiHostMsg_PPBFileIO_SetLength(
-      kApiID, host_resource(), length));
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
-  return PP_OK_COMPLETIONPENDING;
-}
-
-int32_t FileIO::FlushValidated(PP_CompletionCallback callback) {
-  GetDispatcher()->Send(new PpapiHostMsg_PPBFileIO_Flush(
-      kApiID, host_resource()));
-  RegisterCallback(OPERATION_EXCLUSIVE, callback, NULL, NULL);
-  return PP_OK_COMPLETIONPENDING;
-}
-
-}  // namespace
-
-// -----------------------------------------------------------------------------
-
-PPB_FileIO_Proxy::PPB_FileIO_Proxy(Dispatcher* dispatcher)
-    : InterfaceProxy(dispatcher),
-      callback_factory_(ALLOW_THIS_IN_INITIALIZER_LIST(this)) {
-}
-
-PPB_FileIO_Proxy::~PPB_FileIO_Proxy() {
-}
-
-// static
-PP_Resource PPB_FileIO_Proxy::CreateProxyResource(PP_Instance instance) {
-  PluginDispatcher* dispatcher = PluginDispatcher::GetForInstance(instance);
-  if (!dispatcher)
-    return 0;
-
-  HostResource result;
-  dispatcher->Send(new PpapiHostMsg_PPBFileIO_Create(kApiID, instance,
-                                                     &result));
-  if (result.is_null())
-    return 0;
-  return (new FileIO(result))->GetReference();
-}
-
-bool PPB_FileIO_Proxy::OnMessageReceived(const IPC::Message& msg) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(PPB_FileIO_Proxy, msg)
-    // Plugin -> host message.
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_Create, OnHostMsgCreate)
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_Open, OnHostMsgOpen)
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_Close, OnHostMsgClose)
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_Query, OnHostMsgQuery)
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_Touch, OnHostMsgTouch)
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_Read, OnHostMsgRead)
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_Write, OnHostMsgWrite)
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_SetLength, OnHostMsgSetLength)
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_Flush, OnHostMsgFlush)
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_WillWrite, OnHostMsgWillWrite)
-    IPC_MESSAGE_HANDLER(PpapiHostMsg_PPBFileIO_WillSetLength,
-                        OnHostMsgWillSetLength)
-
-    // Host -> plugin messages.
-    IPC_MESSAGE_HANDLER(PpapiMsg_PPBFileIO_GeneralComplete,
-                        OnPluginMsgGeneralComplete)
-    IPC_MESSAGE_HANDLER(PpapiMsg_PPBFileIO_OpenFileComplete,
-                        OnPluginMsgOpenFileComplete)
-    IPC_MESSAGE_HANDLER(PpapiMsg_PPBFileIO_QueryComplete,
-                        OnPluginMsgQueryComplete)
-    IPC_MESSAGE_HANDLER(PpapiMsg_PPBFileIO_ReadComplete,
-                        OnPluginMsgReadComplete)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-  return handled;
-}
-
-void PPB_FileIO_Proxy::OnHostMsgCreate(PP_Instance instance,
-                                       HostResource* result) {
-  thunk::EnterResourceCreation enter(instance);
-  if (enter.succeeded()) {
-    result->SetHostResource(instance,
-                            enter.functions()->CreateFileIO(instance));
-  }
-}
-
-void PPB_FileIO_Proxy::OnHostMsgOpen(const HostResource& host_resource,
-                                     const HostResource& file_ref_resource,
-                                     int32_t open_flags) {
-  EnterHostFileIO enter(host_resource, callback_factory_,
-      &PPB_FileIO_Proxy::OpenFileCallbackCompleteInHost, host_resource);
-  if (enter.succeeded()) {
-    enter.SetResult(enter.object()->Open(
-        file_ref_resource.host_resource(), open_flags, enter.callback()));
-  }
-}
-
-void PPB_FileIO_Proxy::OnHostMsgClose(const HostResource& host_resource) {
-  EnterHostFromHostResource<PPB_FileIO_API> enter(host_resource);
-  if (enter.succeeded())
-    enter.object()->Close();
-}
-
-void PPB_FileIO_Proxy::OnHostMsgQuery(const HostResource& host_resource) {
-  // The callback will take charge of deleting the FileInfo. The contents must
-  // be defined so we don't send garbage to the plugin in the failure case.
-  PP_FileInfo* info = new PP_FileInfo;
-  memset(info, 0, sizeof(PP_FileInfo));
-  EnterHostFileIO enter(host_resource, callback_factory_,
-                        &PPB_FileIO_Proxy::QueryCallbackCompleteInHost,
-                        host_resource, info);
-  if (enter.succeeded())
-    enter.SetResult(enter.object()->Query(info, enter.callback()));
-}
-
-void PPB_FileIO_Proxy::OnHostMsgTouch(const HostResource& host_resource,
-                                      PP_Time last_access_time,
-                                      PP_Time last_modified_time) {
-  EnterHostFileIO enter(host_resource, callback_factory_,
-                        &PPB_FileIO_Proxy::GeneralCallbackCompleteInHost,
-                        host_resource);
-  if (enter.succeeded()) {
-    enter.SetResult(enter.object()->Touch(last_access_time, last_modified_time,
-                                          enter.callback()));
-  }
-}
-
-void PPB_FileIO_Proxy::OnHostMsgRead(const HostResource& host_resource,
-                                     int64_t offset,
-                                     int32_t bytes_to_read) {
-  // Validate bytes_to_read before allocating below. This value is coming from
-  // the untrusted plugin.
-  bytes_to_read = std::min(bytes_to_read, kMaxReadSize);
-  if (bytes_to_read < 0) {
-    ReadCallbackCompleteInHost(PP_ERROR_FAILED, host_resource,
-                               new std::string());
-    return;
-  }
-
-  // The callback will take charge of deleting the string.
-  std::string* dest = new std::string;
-  dest->resize(bytes_to_read);
-  EnterHostFileIO enter(host_resource, callback_factory_,
-                        &PPB_FileIO_Proxy::ReadCallbackCompleteInHost,
-                        host_resource, dest);
-  if (enter.succeeded()) {
-    enter.SetResult(enter.object()->Read(offset,
-                                         bytes_to_read > 0 ? &(*dest)[0] : NULL,
-                                         bytes_to_read, enter.callback()));
-  }
-}
-
-void PPB_FileIO_Proxy::OnHostMsgWrite(const HostResource& host_resource,
-                                      int64_t offset,
-                                      const std::string& data) {
-  EnterHostFileIO enter(host_resource, callback_factory_,
-                        &PPB_FileIO_Proxy::GeneralCallbackCompleteInHost,
-                        host_resource);
-  if (enter.succeeded()) {
-    enter.SetResult(enter.object()->Write(offset, data.data(), data.size(),
-                                          enter.callback()));
-  }
-}
-
-void PPB_FileIO_Proxy::OnHostMsgSetLength(const HostResource& host_resource,
-                                          int64_t length) {
-  EnterHostFileIO enter(host_resource, callback_factory_,
-                        &PPB_FileIO_Proxy::GeneralCallbackCompleteInHost,
-                        host_resource);
-  if (enter.succeeded())
-    enter.SetResult(enter.object()->SetLength(length, enter.callback()));
-}
-
-void PPB_FileIO_Proxy::OnHostMsgFlush(const HostResource& host_resource) {
-  EnterHostFileIO enter(host_resource, callback_factory_,
-                        &PPB_FileIO_Proxy::GeneralCallbackCompleteInHost,
-                        host_resource);
-  if (enter.succeeded())
-    enter.SetResult(enter.object()->Flush(enter.callback()));
-}
-
-void PPB_FileIO_Proxy::OnHostMsgWillWrite(const HostResource& host_resource,
-                                          int64_t offset,
-                                          int32_t bytes_to_write) {
-  EnterHostFileIO enter(host_resource, callback_factory_,
-                        &PPB_FileIO_Proxy::GeneralCallbackCompleteInHost,
-                        host_resource);
-  if (enter.succeeded()) {
-    enter.SetResult(enter.object()->WillWrite(offset, bytes_to_write,
-                                              enter.callback()));
-  }
-}
-
-void PPB_FileIO_Proxy::OnHostMsgWillSetLength(const HostResource& host_resource,
-                                              int64_t length) {
-  EnterHostFileIO enter(host_resource, callback_factory_,
-                        &PPB_FileIO_Proxy::GeneralCallbackCompleteInHost,
-                        host_resource);
-  if (enter.succeeded())
-    enter.SetResult(enter.object()->WillSetLength(length, enter.callback()));
-}
-
-void PPB_FileIO_Proxy::OnPluginMsgGeneralComplete(
-    const HostResource& host_resource,
-    int32_t result) {
-  EnterPluginFileIO enter(host_resource);
-  if (enter.succeeded())
-    static_cast<FileIO*>(enter.object())->ExecuteGeneralCallback(result);
-}
-
-void PPB_FileIO_Proxy::OnPluginMsgOpenFileComplete(
-    const HostResource& host_resource,
-    int32_t result) {
-  EnterPluginFileIO enter(host_resource);
-  if (enter.succeeded())
-    static_cast<FileIO*>(enter.object())->ExecuteOpenFileCallback(result);
-}
-
-void PPB_FileIO_Proxy::OnPluginMsgQueryComplete(
-    const HostResource& host_resource,
-    int32_t result,
-    const PP_FileInfo& info) {
-  EnterPluginFileIO enter(host_resource);
-  if (enter.succeeded())
-    static_cast<FileIO*>(enter.object())->ExecuteQueryCallback(result, info);
-}
-
-void PPB_FileIO_Proxy::OnPluginMsgReadComplete(
-    const HostResource& host_resource,
-    int32_t result,
-    const std::string& data) {
-  EnterPluginFileIO enter(host_resource);
-  if (enter.succeeded()) {
-    // The result code should contain the data size if it's positive.
-    DCHECK((result < 0 && data.size() == 0) ||
-           result == static_cast<int32_t>(data.size()));
-    static_cast<FileIO*>(enter.object())->ExecuteReadCallback(result,
-                                                              data.data());
-  }
-}
-
-void PPB_FileIO_Proxy::GeneralCallbackCompleteInHost(
-    int32_t pp_error,
-    const HostResource& host_resource) {
-  Send(new PpapiMsg_PPBFileIO_GeneralComplete(kApiID, host_resource, pp_error));
-}
-
-void PPB_FileIO_Proxy::OpenFileCallbackCompleteInHost(
-    int32_t pp_error,
-    const HostResource& host_resource) {
-  Send(new PpapiMsg_PPBFileIO_OpenFileComplete(kApiID, host_resource,
-                                               pp_error));
-}
-
-void PPB_FileIO_Proxy::QueryCallbackCompleteInHost(
-    int32_t pp_error,
-    const HostResource& host_resource,
-    PP_FileInfo* info) {
-  Send(new PpapiMsg_PPBFileIO_QueryComplete(kApiID, host_resource, pp_error,
-                                            *info));
-  delete info;
-}
-
-void PPB_FileIO_Proxy::ReadCallbackCompleteInHost(
-    int32_t pp_error,
-    const HostResource& host_resource,
-    std::string* data) {
-  // Only send the amount of data in the string that was actually read.
-  if (pp_error >= 0) {
-    DCHECK(pp_error <= static_cast<int32_t>(data->size()));
-    data->resize(pp_error);
-  }
-  Send(new PpapiMsg_PPBFileIO_ReadComplete(kApiID, host_resource, pp_error,
-                                           *data));
-  delete data;
-}
-
-}  // namespace proxy
-}  // namespace ppapi