Refactor FileIO to the new design

ppapi/proxy/file_io_resource.h

+// 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.
+
+#ifndef PPAPI_PROXY_FILE_IO_RESOURCE_H_
+#define PPAPI_PROXY_FILE_IO_RESOURCE_H_
+
+#include "ppapi/proxy/connection.h"
+#include "ppapi/proxy/plugin_resource.h"
+#include "ppapi/proxy/ppapi_proxy_export.h"
+#include "ppapi/shared_impl/ppb_file_io_shared.h"
+#include "ppapi/thunk/ppb_file_io_api.h"
+
+namespace ppapi {
+
+class TrackedCallback;
+
+namespace proxy {
+
+class PPAPI_PROXY_EXPORT FileIOResource
+    : public PluginResource,
+      public ppapi::PPB_FileIO_Shared,
+      public thunk::PPB_FileIO_API {
+ public:
+  FileIOResource(Connection connection, PP_Instance instance);
+  virtual ~FileIOResource();
+
+  // Resource overrides.
+  virtual thunk::PPB_FileIO_API* AsPPB_FileIO_API() OVERRIDE;
+
+  // PPB_FileIO_API implementations.
+  virtual int32_t Open(PP_Resource file_ref,
+                       int32_t open_flags,
+                       scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t Query(PP_FileInfo* info,
+                        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 Read(int64_t offset,
+                       char* buffer,
+                       int32_t bytes_to_read,
+                       scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t ReadToArray(int64_t offset,
+                              int32_t max_read_length,
+                              PP_ArrayOutput* array_output,
+                              scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t Write(int64_t offset,
+                        const char* buffer,
+                        int32_t bytes_to_write,
+                        scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t SetLength(int64_t length,
+                            scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t Flush(scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual void Close() OVERRIDE;
+  virtual int32_t GetOSFileDescriptor() OVERRIDE;
+  virtual int32_t WillWrite(int64_t offset,
+                            int32_t bytes_to_write,
+                            scoped_refptr<TrackedCallback> callback) OVERRIDE;
+  virtual int32_t WillSetLength(
+      int64_t length,
+      scoped_refptr<TrackedCallback> callback) OVERRIDE;
+
+ private:
+  // PPB_FileIO_Shared implementations.
+  virtual int32_t CommonPreCondition(bool should_be_open,
+                                     OperationType new_op) OVERRIDE;
+  virtual void CommonPostCondition(OperationType new_op) OVERRIDE;
+  virtual int32_t OpenValidated(PP_Resource file_ref_resource,
+                                thunk::PPB_FileRef_API* file_ref_api,
+                                int32_t open_flags) OVERRIDE;
+  virtual int32_t QueryValidated() OVERRIDE;
+  virtual int32_t TouchValidated(PP_Time last_access_time,
+                                 PP_Time last_modified_time) OVERRIDE;
+  virtual int32_t ReadValidated(int64_t offset,
+                                int32_t bytes_to_read) OVERRIDE;
+  virtual int32_t WriteValidated(int64_t offset,
+                                 const char* buffer,
+                                 int32_t bytes_to_write) OVERRIDE;
+  virtual int32_t SetLengthValidated(int64_t length) OVERRIDE;
+  virtual int32_t FlushValidated() OVERRIDE;
+
+  // Handlers of reply messages.  Note that all of them have a callback
+  // parameters bound when call to the host.
+  void OnPluginMsgGeneralComplete(scoped_refptr<TrackedCallback> callback,
+                                  const ResourceMessageReplyParams& params);
+  void OnPluginMsgOpenFileComplete(scoped_refptr<TrackedCallback> callback,
+                                   const ResourceMessageReplyParams& params);
+  void OnPluginMsgQueryComplete(scoped_refptr<TrackedCallback> callback,
+                                PP_FileInfo* output_info_,
+                                const ResourceMessageReplyParams& params,
+                                const PP_FileInfo& info);
+  void OnPluginMsgReadComplete(scoped_refptr<TrackedCallback> callback,
+                               PP_ArrayOutput array_output,
+                               const ResourceMessageReplyParams& params,
+                               const std::string& data);
+
+  // Marks the state of current operations on started or finished.
+  void SetOpInProgress(OperationType op);
+  void SetOpFinished();
+
+  int num_pending_ops_;
+  OperationType pending_op_;
+
+  // Temporary variables just to pass from "OP" (e.g. Open) to "{OP}Validated"
+  // (e.g. QueryValidated).  These are short-living data and must be copied in
+  // {OP}Validated immediately.  In fact, they are copied to the closure of
+  // OnPluginMsg* handler via Bind.
+  PP_ArrayOutput temp_array_output_;
+  PP_FileInfo* temp_info_;
+  scoped_refptr<TrackedCallback> temp_callback_;
+};
+
+}  // namespace proxy
+}  // namespace ppapi
+
+#endif  // PPAPI_PROXY_FILE_IO_RESOURCE_H_