ppapi/proxy/content_decryptor_private_serializer.h

   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 #ifndef PPAPI_PROXY_CONTENT_DECRYPTOR_PRIVATE_SERIALIZER_H_
   6 #define PPAPI_PROXY_CONTENT_DECRYPTOR_PRIVATE_SERIALIZER_H_
   7
   8 #include <cstring>
   9 #include <string>
  10
  11 #include "ppapi/c/private/pp_content_decryptor.h"
  12
  13 namespace ppapi {
  14 namespace proxy {
  15
  16 // Serialization/deserialization utility functions for storing/extracting
  17 // PP_DecryptedBlockInfo, PP_EncryptedBlockInfo, and PP_DecompressedFrameInfo
  18 // structs within std::string's for passing through IPC. Both functions return
  19 // true upon success, and false upon failure.
  20 //
  21 // Note, these functions check the size of |block_info| against the size of
  22 // the "serialized" data stored within |serialized_block_info|, and will report
  23 // failure if expectations are not met. Use of CHECK/DCHECK has been avoided
  24 // because the functions are intended for use on both sides of the IPC proxy.
  25
  26 template <typename T>
  27 bool SerializeBlockInfo(const T& block_info,
  28                         std::string* serialized_block_info) {
  29   if (!serialized_block_info)
  30     return false;
  31
  32   serialized_block_info->assign(reinterpret_cast<const char*>(&block_info),
  33                                 sizeof(block_info));
  34
  35   if (serialized_block_info->size() != sizeof(block_info))
  36     return false;
  37
  38   return true;
  39 }
  40
  41 template <typename T>
  42 bool DeserializeBlockInfo(const std::string& serialized_block_info,
  43                           T* block_info) {
  44   if (!block_info)
  45     return false;
  46
  47   if (serialized_block_info.size() != sizeof(*block_info))
  48     return false;
  49
  50   std::memcpy(block_info, serialized_block_info.data(), sizeof(*block_info));
  51   return true;
  52 }
  53
  54 }  // namespace proxy
  55 }  // namespace ppapi
  56
  57 #endif  // PPAPI_PROXY_CONTENT_DECRYPTOR_PRIVATE_SERIALIZER_H_