ppapi/shared_impl/file_io_state_manager.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ppapi/shared_impl/file_io_state_manager.h"
   6
   7 #include "base/logging.h"
   8 #include "ppapi/c/pp_errors.h"
   9
  10 namespace ppapi {
  11
  12 FileIOStateManager::FileIOStateManager()
  13     : num_pending_ops_(0), pending_op_(OPERATION_NONE), file_open_(false) {}
  14
  15 FileIOStateManager::~FileIOStateManager() {}
  16
  17 void FileIOStateManager::SetOpenSucceed() { file_open_ = true; }
  18
  19 int32_t FileIOStateManager::CheckOperationState(OperationType new_op,
  20                                                 bool should_be_open) {
  21   if (should_be_open) {
  22     if (!file_open_)
  23       return PP_ERROR_FAILED;
  24   } else {
  25     if (file_open_)
  26       return PP_ERROR_FAILED;
  27   }
  28
  29   if (pending_op_ != OPERATION_NONE &&
  30       (pending_op_ != new_op || pending_op_ == OPERATION_EXCLUSIVE))
  31     return PP_ERROR_INPROGRESS;
  32
  33   return PP_OK;
  34 }
  35
  36 void FileIOStateManager::SetPendingOperation(OperationType new_op) {
  37   DCHECK(pending_op_ == OPERATION_NONE ||
  38          (pending_op_ != OPERATION_EXCLUSIVE && pending_op_ == new_op));
  39   pending_op_ = new_op;
  40   num_pending_ops_++;
  41 }
  42
  43 void FileIOStateManager::SetOperationFinished() {
  44   DCHECK_GT(num_pending_ops_, 0);
  45   if (--num_pending_ops_ == 0)
  46     pending_op_ = OPERATION_NONE;
  47 }
  48
  49 }  // namespace ppapi