Extensions: Move cast_channel and hid APIs to extensions/.

chrome/browser/extensions/api/cast_channel/cast_socket.cc

Index: chrome/browser/extensions/api/cast_channel/cast_socket.cc
diff --git a/chrome/browser/extensions/api/cast_channel/cast_socket.cc b/chrome/browser/extensions/api/cast_channel/cast_socket.cc
deleted file mode 100644
index 6130d92e18755dc825880177b785f7536baf5afc..0000000000000000000000000000000000000000
--- a/chrome/browser/extensions/api/cast_channel/cast_socket.cc
+++ /dev/null
@@ -1,760 +0,0 @@
-// Copyright 2013 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 "chrome/browser/extensions/api/cast_channel/cast_socket.h"
-
-#include <stdlib.h>
-#include <string.h>
-
-#include "base/bind.h"
-#include "base/callback_helpers.h"
-#include "base/lazy_instance.h"
-#include "base/numerics/safe_conversions.h"
-#include "base/strings/string_number_conversions.h"
-#include "base/sys_byteorder.h"
-#include "chrome/browser/extensions/api/cast_channel/cast_auth_util.h"
-#include "chrome/browser/extensions/api/cast_channel/cast_channel.pb.h"
-#include "chrome/browser/extensions/api/cast_channel/cast_message_util.h"
-#include "net/base/address_list.h"
-#include "net/base/host_port_pair.h"
-#include "net/base/net_errors.h"
-#include "net/base/net_util.h"
-#include "net/cert/cert_verifier.h"
-#include "net/cert/x509_certificate.h"
-#include "net/http/transport_security_state.h"
-#include "net/socket/client_socket_factory.h"
-#include "net/socket/client_socket_handle.h"
-#include "net/socket/ssl_client_socket.h"
-#include "net/socket/stream_socket.h"
-#include "net/socket/tcp_client_socket.h"
-#include "net/ssl/ssl_config_service.h"
-#include "net/ssl/ssl_info.h"
-
-// Assumes |ip_endpoint_| of type net::IPEndPoint and |channel_auth_| of enum
-// type ChannelAuthType are available in the current scope.
-#define VLOG_WITH_CONNECTION(level) VLOG(level) << "[" << \
-    ip_endpoint_.ToString() << ", auth=" << channel_auth_ << "] "
-
-namespace {
-
-// The default keepalive delay.  On Linux, keepalives probes will be sent after
-// the socket is idle for this length of time, and the socket will be closed
-// after 9 failed probes.  So the total idle time before close is 10 *
-// kTcpKeepAliveDelaySecs.
-const int kTcpKeepAliveDelaySecs = 10;
-
-}  // namespace
-
-namespace extensions {
-
-static base::LazyInstance<BrowserContextKeyedAPIFactory<
-    ApiResourceManager<api::cast_channel::CastSocket> > > g_factory =
-    LAZY_INSTANCE_INITIALIZER;
-
-// static
-template <>
-BrowserContextKeyedAPIFactory<
-    ApiResourceManager<api::cast_channel::CastSocket> >*
-ApiResourceManager<api::cast_channel::CastSocket>::GetFactoryInstance() {
-  return g_factory.Pointer();
-}
-
-namespace api {
-namespace cast_channel {
-
-CastSocket::CastSocket(const std::string& owner_extension_id,
-                       const net::IPEndPoint& ip_endpoint,
-                       ChannelAuthType channel_auth,
-                       CastSocket::Delegate* delegate,
-                       net::NetLog* net_log) :
-    ApiResource(owner_extension_id),
-    channel_id_(0),
-    ip_endpoint_(ip_endpoint),
-    channel_auth_(channel_auth),
-    delegate_(delegate),
-    current_message_size_(0),
-    current_message_(new CastMessage()),
-    net_log_(net_log),
-    connect_state_(CONN_STATE_NONE),
-    write_state_(WRITE_STATE_NONE),
-    read_state_(READ_STATE_NONE),
-    error_state_(CHANNEL_ERROR_NONE),
-    ready_state_(READY_STATE_NONE) {
-  DCHECK(net_log_);
-  DCHECK(channel_auth_ == CHANNEL_AUTH_TYPE_SSL ||
-         channel_auth_ == CHANNEL_AUTH_TYPE_SSL_VERIFIED);
-  net_log_source_.type = net::NetLog::SOURCE_SOCKET;
-  net_log_source_.id = net_log_->NextID();
-
-  // Reuse these buffers for each message.
-  header_read_buffer_ = new net::GrowableIOBuffer();
-  header_read_buffer_->SetCapacity(MessageHeader::header_size());
-  body_read_buffer_ = new net::GrowableIOBuffer();
-  body_read_buffer_->SetCapacity(MessageHeader::max_message_size());
-  current_read_buffer_ = header_read_buffer_;
-}
-
-CastSocket::~CastSocket() { }
-
-ReadyState CastSocket::ready_state() const {
-  return ready_state_;
-}
-
-ChannelError CastSocket::error_state() const {
-  return error_state_;
-}
-
-scoped_ptr<net::TCPClientSocket> CastSocket::CreateTcpSocket() {
-  net::AddressList addresses(ip_endpoint_);
-  return scoped_ptr<net::TCPClientSocket>(
-      new net::TCPClientSocket(addresses, net_log_, net_log_source_));
-  // Options cannot be set on the TCPClientSocket yet, because the
-  // underlying platform socket will not be created until Bind()
-  // or Connect() is called.
-}
-
-scoped_ptr<net::SSLClientSocket> CastSocket::CreateSslSocket(
-    scoped_ptr<net::StreamSocket> socket) {
-  net::SSLConfig ssl_config;
-  // If a peer cert was extracted in a previous attempt to connect, then
-  // whitelist that cert.
-  if (!peer_cert_.empty()) {
-    net::SSLConfig::CertAndStatus cert_and_status;
-    cert_and_status.cert_status = net::CERT_STATUS_AUTHORITY_INVALID;
-    cert_and_status.der_cert = peer_cert_;
-    ssl_config.allowed_bad_certs.push_back(cert_and_status);
-  }
-
-  cert_verifier_.reset(net::CertVerifier::CreateDefault());
-  transport_security_state_.reset(new net::TransportSecurityState);
-  net::SSLClientSocketContext context;
-  // CertVerifier and TransportSecurityState are owned by us, not the
-  // context object.
-  context.cert_verifier = cert_verifier_.get();
-  context.transport_security_state = transport_security_state_.get();
-
-  scoped_ptr<net::ClientSocketHandle> connection(new net::ClientSocketHandle);
-  connection->SetSocket(socket.Pass());
-  net::HostPortPair host_and_port = net::HostPortPair::FromIPEndPoint(
-      ip_endpoint_);
-
-  return net::ClientSocketFactory::GetDefaultFactory()->CreateSSLClientSocket(
-      connection.Pass(), host_and_port, ssl_config, context);
-}
-
-bool CastSocket::ExtractPeerCert(std::string* cert) {
-  DCHECK(cert);
-  DCHECK(peer_cert_.empty());
-  net::SSLInfo ssl_info;
-  if (!socket_->GetSSLInfo(&ssl_info) || !ssl_info.cert.get())
-    return false;
-  bool result = net::X509Certificate::GetDEREncoded(
-     ssl_info.cert->os_cert_handle(), cert);
-  if (result)
-    VLOG_WITH_CONNECTION(1) << "Successfully extracted peer certificate: "
-                            << *cert;
-  return result;
-}
-
-bool CastSocket::VerifyChallengeReply() {
-  return AuthenticateChallengeReply(*challenge_reply_.get(), peer_cert_);
-}
-
-void CastSocket::Connect(const net::CompletionCallback& callback) {
-  DCHECK(CalledOnValidThread());
-  VLOG_WITH_CONNECTION(1) << "Connect readyState = " << ready_state_;
-  if (ready_state_ != READY_STATE_NONE) {
-    callback.Run(net::ERR_CONNECTION_FAILED);
-    return;
-  }
-  ready_state_ = READY_STATE_CONNECTING;
-  connect_callback_ = callback;
-  connect_state_ = CONN_STATE_TCP_CONNECT;
-  DoConnectLoop(net::OK);
-}
-
-void CastSocket::PostTaskToStartConnectLoop(int result) {
-  DCHECK(CalledOnValidThread());
-  base::MessageLoop::current()->PostTask(
-      FROM_HERE,
-      base::Bind(&CastSocket::DoConnectLoop, AsWeakPtr(), result));
-}
-
-// This method performs the state machine transitions for connection flow.
-// There are two entry points to this method:
-// 1. Connect method: this starts the flow
-// 2. Callback from network operations that finish asynchronously
-void CastSocket::DoConnectLoop(int result) {
-  // Network operations can either finish synchronously or asynchronously.
-  // This method executes the state machine transitions in a loop so that
-  // correct state transitions happen even when network operations finish
-  // synchronously.
-  int rv = result;
-  do {
-    ConnectionState state = connect_state_;
-    // Default to CONN_STATE_NONE, which breaks the processing loop if any
-    // handler fails to transition to another state to continue processing.
-    connect_state_ = CONN_STATE_NONE;
-    switch (state) {
-      case CONN_STATE_TCP_CONNECT:
-        rv = DoTcpConnect();
-        break;
-      case CONN_STATE_TCP_CONNECT_COMPLETE:
-        rv = DoTcpConnectComplete(rv);
-        break;
-      case CONN_STATE_SSL_CONNECT:
-        DCHECK_EQ(net::OK, rv);
-        rv = DoSslConnect();
-        break;
-      case CONN_STATE_SSL_CONNECT_COMPLETE:
-        rv = DoSslConnectComplete(rv);
-        break;
-      case CONN_STATE_AUTH_CHALLENGE_SEND:
-        rv = DoAuthChallengeSend();
-        break;
-      case CONN_STATE_AUTH_CHALLENGE_SEND_COMPLETE:
-        rv = DoAuthChallengeSendComplete(rv);
-        break;
-      case CONN_STATE_AUTH_CHALLENGE_REPLY_COMPLETE:
-        rv = DoAuthChallengeReplyComplete(rv);
-        break;
-      default:
-        NOTREACHED() << "BUG in connect flow. Unknown state: " << state;
-        break;
-    }
-  } while (rv != net::ERR_IO_PENDING && connect_state_ != CONN_STATE_NONE);
-  // Get out of the loop either when:
-  // a. A network operation is pending, OR
-  // b. The Do* method called did not change state
-
-  // Connect loop is finished: if there is no pending IO invoke the callback.
-  if (rv != net::ERR_IO_PENDING)
-    DoConnectCallback(rv);
-}
-
-int CastSocket::DoTcpConnect() {
-  VLOG_WITH_CONNECTION(1) << "DoTcpConnect";
-  connect_state_ = CONN_STATE_TCP_CONNECT_COMPLETE;
-  tcp_socket_ = CreateTcpSocket();
-  return tcp_socket_->Connect(
-      base::Bind(&CastSocket::DoConnectLoop, AsWeakPtr()));
-}
-
-int CastSocket::DoTcpConnectComplete(int result) {
-  VLOG_WITH_CONNECTION(1) << "DoTcpConnectComplete: " << result;
-  if (result == net::OK) {
-    // Enable TCP protocol-level keep-alive.
-    bool result = tcp_socket_->SetKeepAlive(true, kTcpKeepAliveDelaySecs);
-    LOG_IF(WARNING, !result) << "Failed to SetKeepAlive.";
-    connect_state_ = CONN_STATE_SSL_CONNECT;
-  }
-  return result;
-}
-
-int CastSocket::DoSslConnect() {
-  VLOG_WITH_CONNECTION(1) << "DoSslConnect";
-  connect_state_ = CONN_STATE_SSL_CONNECT_COMPLETE;
-  socket_ = CreateSslSocket(tcp_socket_.PassAs<net::StreamSocket>());
-  return socket_->Connect(
-      base::Bind(&CastSocket::DoConnectLoop, AsWeakPtr()));
-}
-
-int CastSocket::DoSslConnectComplete(int result) {
-  VLOG_WITH_CONNECTION(1) << "DoSslConnectComplete: " << result;
-  if (result == net::ERR_CERT_AUTHORITY_INVALID &&
-      peer_cert_.empty() && ExtractPeerCert(&peer_cert_)) {
-    connect_state_ = CONN_STATE_TCP_CONNECT;
-  } else if (result == net::OK &&
-             channel_auth_ == CHANNEL_AUTH_TYPE_SSL_VERIFIED) {
-    connect_state_ = CONN_STATE_AUTH_CHALLENGE_SEND;
-  }
-  return result;
-}
-
-int CastSocket::DoAuthChallengeSend() {
-  VLOG_WITH_CONNECTION(1) << "DoAuthChallengeSend";
-  connect_state_ = CONN_STATE_AUTH_CHALLENGE_SEND_COMPLETE;
-  CastMessage challenge_message;
-  CreateAuthChallengeMessage(&challenge_message);
-  VLOG_WITH_CONNECTION(1) << "Sending challenge: "
-                          << CastMessageToString(challenge_message);
-  // Post a task to send auth challenge so that DoWriteLoop is not nested inside
-  // DoConnectLoop. This is not strictly necessary but keeps the write loop
-  // code decoupled from connect loop code.
-  base::MessageLoop::current()->PostTask(
-      FROM_HERE,
-      base::Bind(&CastSocket::SendCastMessageInternal, AsWeakPtr(),
-                 challenge_message,
-                 base::Bind(&CastSocket::DoConnectLoop, AsWeakPtr())));
-  // Always return IO_PENDING since the result is always asynchronous.
-  return net::ERR_IO_PENDING;
-}
-
-int CastSocket::DoAuthChallengeSendComplete(int result) {
-  VLOG_WITH_CONNECTION(1) << "DoAuthChallengeSendComplete: " << result;
-  if (result < 0)
-    return result;
-  connect_state_ = CONN_STATE_AUTH_CHALLENGE_REPLY_COMPLETE;
-  // Post a task to start read loop so that DoReadLoop is not nested inside
-  // DoConnectLoop. This is not strictly necessary but keeps the read loop
-  // code decoupled from connect loop code.
-  PostTaskToStartReadLoop();
-  // Always return IO_PENDING since the result is always asynchronous.
-  return net::ERR_IO_PENDING;
-}
-
-int CastSocket::DoAuthChallengeReplyComplete(int result) {
-  VLOG_WITH_CONNECTION(1) << "DoAuthChallengeReplyComplete: " << result;
-  if (result < 0)
-    return result;
-  if (!VerifyChallengeReply())
-    return net::ERR_FAILED;
-  VLOG_WITH_CONNECTION(1) << "Auth challenge verification succeeded";
-  return net::OK;
-}
-
-void CastSocket::DoConnectCallback(int result) {
-  ready_state_ = (result == net::OK) ? READY_STATE_OPEN : READY_STATE_CLOSED;
-  error_state_ = (result == net::OK) ?
-      CHANNEL_ERROR_NONE : CHANNEL_ERROR_CONNECT_ERROR;
-  if (result == net::OK)  // Start the read loop
-    PostTaskToStartReadLoop();
-  base::ResetAndReturn(&connect_callback_).Run(result);
-}
-
-void CastSocket::Close(const net::CompletionCallback& callback) {
-  DCHECK(CalledOnValidThread());
-  VLOG_WITH_CONNECTION(1) << "Close ReadyState = " << ready_state_;
-  tcp_socket_.reset();
-  socket_.reset();
-  cert_verifier_.reset();
-  transport_security_state_.reset();
-  ready_state_ = READY_STATE_CLOSED;
-  callback.Run(net::OK);
-  // |callback| can delete |this|
-}
-
-void CastSocket::SendMessage(const MessageInfo& message,
-                             const net::CompletionCallback& callback) {
-  DCHECK(CalledOnValidThread());
-  if (ready_state_ != READY_STATE_OPEN) {
-    callback.Run(net::ERR_FAILED);
-    return;
-  }
-  CastMessage message_proto;
-  if (!MessageInfoToCastMessage(message, &message_proto)) {
-    callback.Run(net::ERR_FAILED);
-    return;
-  }
-
-  SendCastMessageInternal(message_proto, callback);
-}
-
-void CastSocket::SendCastMessageInternal(
-    const CastMessage& message,
-    const net::CompletionCallback& callback) {
-  WriteRequest write_request(callback);
-  if (!write_request.SetContent(message)) {
-    callback.Run(net::ERR_FAILED);
-    return;
-  }
-
-  write_queue_.push(write_request);
-  if (write_state_ == WRITE_STATE_NONE) {
-    write_state_ = WRITE_STATE_WRITE;
-    DoWriteLoop(net::OK);
-  }
-}
-
-void CastSocket::DoWriteLoop(int result) {
-  DCHECK(CalledOnValidThread());
-  VLOG_WITH_CONNECTION(1) << "DoWriteLoop queue size: " << write_queue_.size();
-
-  if (write_queue_.empty()) {
-    write_state_ = WRITE_STATE_NONE;
-    return;
-  }
-
-  // Network operations can either finish synchronously or asynchronously.
-  // This method executes the state machine transitions in a loop so that
-  // write state transitions happen even when network operations finish
-  // synchronously.
-  int rv = result;
-  do {
-    WriteState state = write_state_;
-    write_state_ = WRITE_STATE_NONE;
-    switch (state) {
-      case WRITE_STATE_WRITE:
-        rv = DoWrite();
-        break;
-      case WRITE_STATE_WRITE_COMPLETE:
-        rv = DoWriteComplete(rv);
-        break;
-      case WRITE_STATE_DO_CALLBACK:
-        rv = DoWriteCallback();
-        break;
-      case WRITE_STATE_ERROR:
-        rv = DoWriteError(rv);
-        break;
-      default:
-        NOTREACHED() << "BUG in write flow. Unknown state: " << state;
-        break;
-    }
-  } while (!write_queue_.empty() &&
-           rv != net::ERR_IO_PENDING &&
-           write_state_ != WRITE_STATE_NONE);
-
-  // If write loop is done because the queue is empty then set write
-  // state to NONE
-  if (write_queue_.empty())
-    write_state_ = WRITE_STATE_NONE;
-
-  // Write loop is done - if the result is ERR_FAILED then close with error.
-  if (rv == net::ERR_FAILED)
-    CloseWithError(error_state_);
-}
-
-int CastSocket::DoWrite() {
-  DCHECK(!write_queue_.empty());
-  WriteRequest& request = write_queue_.front();
-
-  VLOG_WITH_CONNECTION(2) << "WriteData byte_count = "
-                          << request.io_buffer->size() << " bytes_written "
-                          << request.io_buffer->BytesConsumed();
-
-  write_state_ = WRITE_STATE_WRITE_COMPLETE;
-
-  return socket_->Write(
-      request.io_buffer.get(),
-      request.io_buffer->BytesRemaining(),
-      base::Bind(&CastSocket::DoWriteLoop, AsWeakPtr()));
-}
-
-int CastSocket::DoWriteComplete(int result) {
-  DCHECK(!write_queue_.empty());
-  if (result <= 0) {  // NOTE that 0 also indicates an error
-    error_state_ = CHANNEL_ERROR_SOCKET_ERROR;
-    write_state_ = WRITE_STATE_ERROR;
-    return result == 0 ? net::ERR_FAILED : result;
-  }
-
-  // Some bytes were successfully written
-  WriteRequest& request = write_queue_.front();
-  scoped_refptr<net::DrainableIOBuffer> io_buffer = request.io_buffer;
-  io_buffer->DidConsume(result);
-  if (io_buffer->BytesRemaining() == 0)  // Message fully sent
-    write_state_ = WRITE_STATE_DO_CALLBACK;
-  else
-    write_state_ = WRITE_STATE_WRITE;
-
-  return net::OK;
-}
-
-int CastSocket::DoWriteCallback() {
-  DCHECK(!write_queue_.empty());
-  WriteRequest& request = write_queue_.front();
-  int bytes_consumed = request.io_buffer->BytesConsumed();
-
-  // If inside connection flow, then there should be exaclty one item in
-  // the write queue.
-  if (ready_state_ == READY_STATE_CONNECTING) {
-    write_queue_.pop();
-    DCHECK(write_queue_.empty());
-    PostTaskToStartConnectLoop(bytes_consumed);
-  } else {
-    WriteRequest& request = write_queue_.front();
-    request.callback.Run(bytes_consumed);
-    write_queue_.pop();
-  }
-  write_state_ = WRITE_STATE_WRITE;
-  return net::OK;
-}
-
-int CastSocket::DoWriteError(int result) {
-  DCHECK(!write_queue_.empty());
-  DCHECK_LT(result, 0);
-
-  // If inside connection flow, then there should be exactly one item in
-  // the write queue.
-  if (ready_state_ == READY_STATE_CONNECTING) {
-    write_queue_.pop();
-    DCHECK(write_queue_.empty());
-    PostTaskToStartConnectLoop(result);
-    // Connect loop will handle the error. Return net::OK so that write flow
-    // does not try to report error also.
-    return net::OK;
-  }
-
-  while (!write_queue_.empty()) {
-    WriteRequest& request = write_queue_.front();
-    request.callback.Run(result);
-    write_queue_.pop();
-  }
-  return net::ERR_FAILED;
-}
-
-void CastSocket::PostTaskToStartReadLoop() {
-  DCHECK(CalledOnValidThread());
-  base::MessageLoop::current()->PostTask(
-      FROM_HERE,
-      base::Bind(&CastSocket::StartReadLoop, AsWeakPtr()));
-}
-
-void CastSocket::StartReadLoop() {
-  // Read loop would have already been started if read state is not NONE
-  if (read_state_ == READ_STATE_NONE) {
-    read_state_ = READ_STATE_READ;
-    DoReadLoop(net::OK);
-  }
-}
-
-void CastSocket::DoReadLoop(int result) {
-  DCHECK(CalledOnValidThread());
-  // Network operations can either finish synchronously or asynchronously.
-  // This method executes the state machine transitions in a loop so that
-  // write state transitions happen even when network operations finish
-  // synchronously.
-  int rv = result;
-  do {
-    ReadState state = read_state_;
-    read_state_ = READ_STATE_NONE;
-
-    switch (state) {
-      case READ_STATE_READ:
-        rv = DoRead();
-        break;
-      case READ_STATE_READ_COMPLETE:
-        rv = DoReadComplete(rv);
-        break;
-      case READ_STATE_DO_CALLBACK:
-        rv = DoReadCallback();
-        break;
-      case READ_STATE_ERROR:
-        rv = DoReadError(rv);
-        break;
-      default:
-        NOTREACHED() << "BUG in read flow. Unknown state: " << state;
-        break;
-    }
-  } while (rv != net::ERR_IO_PENDING && read_state_ != READ_STATE_NONE);
-
-  // Read loop is done - If the result is ERR_FAILED then close with error.
-  if (rv == net::ERR_FAILED)
-    CloseWithError(error_state_);
-}
-
-int CastSocket::DoRead() {
-  read_state_ = READ_STATE_READ_COMPLETE;
-  // Figure out whether to read header or body, and the remaining bytes.
-  uint32 num_bytes_to_read = 0;
-  if (header_read_buffer_->RemainingCapacity() > 0) {
-    current_read_buffer_ = header_read_buffer_;
-    num_bytes_to_read = header_read_buffer_->RemainingCapacity();
-    DCHECK_LE(num_bytes_to_read, MessageHeader::header_size());
-  } else {
-    DCHECK_GT(current_message_size_, 0U);
-    num_bytes_to_read = current_message_size_ - body_read_buffer_->offset();
-    current_read_buffer_ = body_read_buffer_;
-    DCHECK_LE(num_bytes_to_read, MessageHeader::max_message_size());
-  }
-  DCHECK_GT(num_bytes_to_read, 0U);
-
-  // Read up to num_bytes_to_read into |current_read_buffer_|.
-  return socket_->Read(
-      current_read_buffer_.get(),
-      num_bytes_to_read,
-      base::Bind(&CastSocket::DoReadLoop, AsWeakPtr()));
-}
-
-int CastSocket::DoReadComplete(int result) {
-  VLOG_WITH_CONNECTION(2) << "DoReadComplete result = " << result
-                          << " header offset = "
-                          << header_read_buffer_->offset()
-                          << " body offset = " << body_read_buffer_->offset();
-  if (result <= 0) {  // 0 means EOF: the peer closed the socket
-    VLOG_WITH_CONNECTION(1) << "Read error, peer closed the socket";
-    error_state_ = CHANNEL_ERROR_SOCKET_ERROR;
-    read_state_ = READ_STATE_ERROR;
-    return result == 0 ? net::ERR_FAILED : result;
-  }
-
-  // Some data was read.  Move the offset in the current buffer forward.
-  DCHECK_LE(current_read_buffer_->offset() + result,
-            current_read_buffer_->capacity());
-  current_read_buffer_->set_offset(current_read_buffer_->offset() + result);
-  read_state_ = READ_STATE_READ;
-
-  if (current_read_buffer_.get() == header_read_buffer_.get() &&
-      current_read_buffer_->RemainingCapacity() == 0) {
-    // A full header is read, process the contents.
-    if (!ProcessHeader()) {
-      error_state_ = cast_channel::CHANNEL_ERROR_INVALID_MESSAGE;
-      read_state_ = READ_STATE_ERROR;
-    }
-  } else if (current_read_buffer_.get() == body_read_buffer_.get() &&
-             static_cast<uint32>(current_read_buffer_->offset()) ==
-             current_message_size_) {
-    // Full body is read, process the contents.
-    if (ProcessBody()) {
-      read_state_ = READ_STATE_DO_CALLBACK;
-    } else {
-      error_state_ = cast_channel::CHANNEL_ERROR_INVALID_MESSAGE;
-      read_state_ = READ_STATE_ERROR;
-    }
-  }
-
-  return net::OK;
-}
-
-int CastSocket::DoReadCallback() {
-  read_state_ = READ_STATE_READ;
-  const CastMessage& message = *(current_message_.get());
-  if (IsAuthMessage(message)) {
-    // An auth message is received, check that connect flow is running.
-    if (ready_state_ == READY_STATE_CONNECTING) {
-      challenge_reply_.reset(new CastMessage(message));
-      PostTaskToStartConnectLoop(net::OK);
-    } else {
-      read_state_ = READ_STATE_ERROR;
-    }
-  } else if (delegate_) {
-    MessageInfo message_info;
-    if (CastMessageToMessageInfo(message, &message_info))
-      delegate_->OnMessage(this, message_info);
-    else
-      read_state_ = READ_STATE_ERROR;
-  }
-  current_message_->Clear();
-  return net::OK;
-}
-
-int CastSocket::DoReadError(int result) {
-  DCHECK_LE(result, 0);
-  // If inside connection flow, then get back to connect loop.
-  if (ready_state_ == READY_STATE_CONNECTING) {
-    PostTaskToStartConnectLoop(result);
-    // does not try to report error also.
-    return net::OK;
-  }
-  return net::ERR_FAILED;
-}
-
-bool CastSocket::ProcessHeader() {
-  DCHECK_EQ(static_cast<uint32>(header_read_buffer_->offset()),
-            MessageHeader::header_size());
-  MessageHeader header;
-  MessageHeader::ReadFromIOBuffer(header_read_buffer_.get(), &header);
-  if (header.message_size > MessageHeader::max_message_size())
-    return false;
-
-  VLOG_WITH_CONNECTION(2) << "Parsed header { message_size: "
-                          << header.message_size << " }";
-  current_message_size_ = header.message_size;
-  return true;
-}
-
-bool CastSocket::ProcessBody() {
-  DCHECK_EQ(static_cast<uint32>(body_read_buffer_->offset()),
-            current_message_size_);
-  if (!current_message_->ParseFromArray(
-      body_read_buffer_->StartOfBuffer(), current_message_size_)) {
-    return false;
-  }
-  current_message_size_ = 0;
-  header_read_buffer_->set_offset(0);
-  body_read_buffer_->set_offset(0);
-  current_read_buffer_ = header_read_buffer_;
-  return true;
-}
-
-// static
-bool CastSocket::Serialize(const CastMessage& message_proto,
-                           std::string* message_data) {
-  DCHECK(message_data);
-  message_proto.SerializeToString(message_data);
-  size_t message_size = message_data->size();
-  if (message_size > MessageHeader::max_message_size()) {
-    message_data->clear();
-    return false;
-  }
-  CastSocket::MessageHeader header;
-  header.SetMessageSize(message_size);
-  header.PrependToString(message_data);
-  return true;
-};
-
-void CastSocket::CloseWithError(ChannelError error) {
-  DCHECK(CalledOnValidThread());
-  socket_.reset(NULL);
-  ready_state_ = READY_STATE_CLOSED;
-  error_state_ = error;
-  if (delegate_)
-    delegate_->OnError(this, error);
-}
-
-std::string CastSocket::CastUrl() const {
-  return ((channel_auth_ == CHANNEL_AUTH_TYPE_SSL_VERIFIED) ?
-          "casts://" : "cast://") + ip_endpoint_.ToString();
-}
-
-bool CastSocket::CalledOnValidThread() const {
-  return thread_checker_.CalledOnValidThread();
-}
-
-CastSocket::MessageHeader::MessageHeader() : message_size(0) { }
-
-void CastSocket::MessageHeader::SetMessageSize(size_t size) {
-  DCHECK(size < static_cast<size_t>(kuint32max));
-  DCHECK(size > 0);
-  message_size = static_cast<size_t>(size);
-}
-
-// TODO(mfoltz): Investigate replacing header serialization with base::Pickle,
-// if bit-for-bit compatible.
-void CastSocket::MessageHeader::PrependToString(std::string* str) {
-  MessageHeader output = *this;
-  output.message_size = base::HostToNet32(message_size);
-  size_t header_size = base::checked_cast<size_t,uint32>(
-      MessageHeader::header_size());
-  scoped_ptr<char, base::FreeDeleter> char_array(
-      static_cast<char*>(malloc(header_size)));
-  memcpy(char_array.get(), &output, header_size);
-  str->insert(0, char_array.get(), header_size);
-}
-
-// TODO(mfoltz): Investigate replacing header deserialization with base::Pickle,
-// if bit-for-bit compatible.
-void CastSocket::MessageHeader::ReadFromIOBuffer(
-    net::GrowableIOBuffer* buffer, MessageHeader* header) {
-  uint32 message_size;
-  size_t header_size = base::checked_cast<size_t,uint32>(
-      MessageHeader::header_size());
-  memcpy(&message_size, buffer->StartOfBuffer(), header_size);
-  header->message_size = base::NetToHost32(message_size);
-}
-
-std::string CastSocket::MessageHeader::ToString() {
-  return "{message_size: " + base::UintToString(message_size) + "}";
-}
-
-CastSocket::WriteRequest::WriteRequest(const net::CompletionCallback& callback)
-  : callback(callback) { }
-
-bool CastSocket::WriteRequest::SetContent(const CastMessage& message_proto) {
-  DCHECK(!io_buffer.get());
-  std::string message_data;
-  if (!Serialize(message_proto, &message_data))
-    return false;
-  io_buffer = new net::DrainableIOBuffer(new net::StringIOBuffer(message_data),
-                                         message_data.size());
-  return true;
-}
-
-CastSocket::WriteRequest::~WriteRequest() { }
-
-}  // namespace cast_channel
-}  // namespace api
-}  // namespace extensions
-
-#undef VLOG_WITH_CONNECTION