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// 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.
#include "ipc/ipc_channel_reader.h"
namespace IPC {
namespace internal {
ChannelReader::ChannelReader(Listener* listener) : listener_(listener) {
memset(input_buf_, 0, sizeof(input_buf_));
}
ChannelReader::~ChannelReader() {
}
bool ChannelReader::ProcessIncomingMessages() {
while (true) {
int bytes_read = 0;
ReadState read_state = ReadData(input_buf_, Channel::kReadBufferSize,
&bytes_read);
if (read_state == READ_FAILED)
return false;
if (read_state == READ_PENDING)
return true;
DCHECK(bytes_read > 0);
if (!DispatchInputData(input_buf_, bytes_read))
return false;
}
}
bool ChannelReader::AsyncReadComplete(int bytes_read) {
return DispatchInputData(input_buf_, bytes_read);
}
bool ChannelReader::IsHelloMessage(const Message& m) const {
return m.routing_id() == MSG_ROUTING_NONE &&
m.type() == Channel::HELLO_MESSAGE_TYPE;
}
bool ChannelReader::DispatchInputData(const char* input_data,
int input_data_len) {
const char* p;
const char* end;
// Possibly combine with the overflow buffer to make a larger buffer.
if (input_overflow_buf_.empty()) {
p = input_data;
end = input_data + input_data_len;
} else {
if (input_overflow_buf_.size() >
Channel::kMaximumMessageSize - input_data_len) {
input_overflow_buf_.clear();
LOG(ERROR) << "IPC message is too big";
return false;
}
input_overflow_buf_.append(input_data, input_data_len);
p = input_overflow_buf_.data();
end = p + input_overflow_buf_.size();
}
// Dispatch all complete messages in the data buffer.
while (p < end) {
const char* message_tail = Message::FindNext(p, end);
if (message_tail) {
int len = static_cast<int>(message_tail - p);
Message m(p, len);
if (!WillDispatchInputMessage(&m))
return false;
if (IsHelloMessage(m))
HandleHelloMessage(m);
else
listener_->OnMessageReceived(m);
p = message_tail;
} else {
// Last message is partial.
break;
}
}
// Save any partial data in the overflow buffer.
input_overflow_buf_.assign(p, end - p);
if (input_overflow_buf_.empty() && !DidEmptyInputBuffers())
return false;
return true;
}
} // namespace internal
} // namespace IPC
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