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),
  14       pending_op_(OPERATION_NONE),
  15       file_open_(false) {
  16 }
  17
  18 FileIOStateManager::~FileIOStateManager() {
  19 }
  20
  21 void FileIOStateManager::SetOpenSucceed() {
  22   file_open_ = true;
  23 }
  24
  25 int32_t FileIOStateManager::CheckOperationState(OperationType new_op,
  26                                                 bool should_be_open) {
  27   if (should_be_open) {
  28     if (!file_open_)
  29       return PP_ERROR_FAILED;
  30   } else {
  31     if (file_open_)
  32       return PP_ERROR_FAILED;
  33   }
  34
  35   if (pending_op_ != OPERATION_NONE &&
  36       (pending_op_ != new_op || pending_op_ == OPERATION_EXCLUSIVE))
  37     return PP_ERROR_INPROGRESS;
  38
  39   return PP_OK;
  40 }
  41
  42 void FileIOStateManager::SetPendingOperation(OperationType new_op) {
  43   DCHECK(pending_op_ == OPERATION_NONE ||
  44          (pending_op_ != OPERATION_EXCLUSIVE && pending_op_ == new_op));
  45   pending_op_ = new_op;
  46   num_pending_ops_++;
  47 }
  48
  49 void FileIOStateManager::SetOperationFinished() {
  50   DCHECK_GT(num_pending_ops_, 0);
  51   if (--num_pending_ops_ == 0)
  52     pending_op_ = OPERATION_NONE;
  53 }
  54
  55 }  // namespace ppapi
  56