ppapi/shared_impl/file_io_state_manager.cc

   1 // Copyright 2012 The Chromium Authors
   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/check_op.h"
   8 #include "base/logging.h"
   9 #include "ppapi/c/pp_errors.h"
  10
  11 namespace ppapi {
  12
  13 FileIOStateManager::FileIOStateManager()
  14     : num_pending_ops_(0), pending_op_(OPERATION_NONE), file_open_(false) {}
  15
  16 FileIOStateManager::~FileIOStateManager() {}
  17
  18 void FileIOStateManager::SetOpenSucceed() { file_open_ = true; }
  19
  20 int32_t FileIOStateManager::CheckOperationState(OperationType new_op,
  21                                                 bool should_be_open) {
  22   if (should_be_open) {
  23     if (!file_open_) {
  24       LOG(ERROR) << "File not opened";
  25       return PP_ERROR_FAILED;
  26     }
  27   } else {
  28     if (file_open_) {
  29       LOG(ERROR) << "File already opened";
  30       return PP_ERROR_FAILED;
  31     }
  32   }
  33
  34   if (pending_op_ != OPERATION_NONE &&
  35       (pending_op_ != new_op || pending_op_ == OPERATION_EXCLUSIVE)) {
  36     LOG(ERROR) << "Operation is in progress";
  37     return PP_ERROR_INPROGRESS;
  38   }
  39
  40   return PP_OK;
  41 }
  42
  43 void FileIOStateManager::SetPendingOperation(OperationType new_op) {
  44   DCHECK(pending_op_ == OPERATION_NONE ||
  45          (pending_op_ != OPERATION_EXCLUSIVE && pending_op_ == new_op));
  46   pending_op_ = new_op;
  47   num_pending_ops_++;
  48 }
  49
  50 void FileIOStateManager::SetOperationFinished() {
  51   DCHECK_GT(num_pending_ops_, 0);
  52   if (--num_pending_ops_ == 0)
  53     pending_op_ = OPERATION_NONE;
  54 }
  55
  56 }  // namespace ppapi