mojo/public/cpp/bindings/lib/message_builder.cc

   1 // Copyright 2013 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 "mojo/public/cpp/bindings/lib/message_builder.h"
   6
   7 #include "mojo/public/cpp/bindings/message.h"
   8
   9 namespace mojo {
  10 namespace internal {
  11
  12 template <typename Header>
  13 void Allocate(Buffer* buf, Header** header) {
  14   *header = static_cast<Header*>(buf->Allocate(sizeof(Header)));
  15   (*header)->num_bytes = sizeof(Header);
  16 }
  17
  18 MessageBuilder::MessageBuilder(uint32_t name, size_t payload_size)
  19     : buf_(sizeof(MessageHeader) + payload_size) {
  20   MessageHeader* header;
  21   Allocate(&buf_, &header);
  22   header->num_fields = 2;
  23   header->name = name;
  24 }
  25
  26 MessageBuilder::~MessageBuilder() {
  27 }
  28
  29 void MessageBuilder::Finish(Message* message) {
  30   uint32_t num_bytes = static_cast<uint32_t>(buf_.size());
  31   message->AdoptData(num_bytes, static_cast<MessageData*>(buf_.Leak()));
  32 }
  33
  34 MessageBuilder::MessageBuilder(size_t size)
  35     : buf_(size) {
  36 }
  37
  38 MessageWithRequestIDBuilder::MessageWithRequestIDBuilder(uint32_t name,
  39                                                          size_t payload_size,
  40                                                          uint32_t flags,
  41                                                          uint64_t request_id)
  42     : MessageBuilder(sizeof(MessageHeaderWithRequestID) + payload_size) {
  43   MessageHeaderWithRequestID* header;
  44   Allocate(&buf_, &header);
  45   header->num_fields = 3;
  46   header->name = name;
  47   header->flags = flags;
  48   header->request_id = request_id;
  49 }
  50
  51 }  // namespace internal
  52 }  // namespace mojo