ppapi/proxy/file_mapping_resource.h

   1 // Copyright 2014 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 #ifndef PPAPI_PROXY_FILE_MAPPING_RESOURCE_H_
   6 #define PPAPI_PROXY_FILE_MAPPING_RESOURCE_H_
   7
   8 #include "ppapi/proxy/file_io_resource.h"
   9 #include "ppapi/proxy/plugin_resource.h"
  10 #include "ppapi/proxy/ppapi_proxy_export.h"
  11 #include "ppapi/thunk/ppb_file_mapping_api.h"
  12
  13 namespace ppapi {
  14 namespace proxy {
  15
  16 // The proxy-side resource for PPB_FileMapping.
  17 class PPAPI_PROXY_EXPORT FileMappingResource
  18       : public PluginResource,
  19         public thunk::PPB_FileMapping_API {
  20  public:
  21   FileMappingResource(Connection connection, PP_Instance instance);
  22
  23  private:
  24   virtual ~FileMappingResource();
  25
  26   // Resource implementation.
  27   virtual thunk::PPB_FileMapping_API* AsPPB_FileMapping_API() override;
  28
  29   // PPB_FileMapping_API implementation.
  30   virtual int32_t Map(PP_Instance instance,
  31                       PP_Resource file_io,
  32                       int64_t length,
  33                       uint32_t protection,
  34                       uint32_t flags,
  35                       int64_t offset,
  36                       void** address,
  37                       scoped_refptr<TrackedCallback> callback) override;
  38   virtual int32_t Unmap(PP_Instance instance,
  39                         const void* address,
  40                         int64_t length,
  41                         scoped_refptr<TrackedCallback> callback) override;
  42   virtual int64_t GetMapPageSize(PP_Instance instance) override;
  43
  44   struct MapResult {
  45     MapResult() : result(PP_ERROR_FAILED), address(NULL) {
  46     }
  47     int32_t result;
  48     void* address;
  49   };
  50   void OnMapCompleted(void** mapped_address_out_param,
  51                       int64_t length,
  52                       scoped_refptr<TrackedCallback> callback,
  53                       const MapResult& map_result);
  54
  55   // These functions perform potentially blocking operations so they should not
  56   // be called on the main thread or while we hold the proxy lock. Their
  57   // implementation is platform specific. See file_mapping_resource_posix.cc and
  58   // file_mapping_resource_win.cc.
  59   static MapResult DoMapBlocking(
  60       scoped_refptr<FileIOResource::FileHolder> file_holder,
  61       void* address_hint,
  62       int64_t length,
  63       uint32_t protection,
  64       uint32_t flags,
  65       int64_t offset);
  66   static int32_t DoUnmapBlocking(const void* address, int64_t length);
  67   // DoGetMapPageSize is platform-specific, but fast enough that we can call it
  68   // on the main thread with the lock.
  69   static int64_t DoGetMapPageSize();
  70
  71   DISALLOW_COPY_AND_ASSIGN(FileMappingResource);
  72 };
  73
  74 }  // namespace proxy
  75 }  // namespace ppapi
  76
  77 #endif  // PPAPI_PROXY_FILE_MAPPING_RESOURCE_H_