PPB_TCPSocket: add support for TCP server socket operations.

ppapi/shared_impl/ppb_tcp_socket_shared.cc

+// 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 "ppapi/shared_impl/ppb_tcp_socket_shared.h"
+
+#include "base/logging.h"
+
+namespace ppapi {
+
+TCPSocketState::TCPSocketState(StateType state)
+    : state_(state),
+      pending_transition_(NONE) {
+  DCHECK(state_ == INITIAL || state_ == CONNECTED);
+}
+
+TCPSocketState::~TCPSocketState() {
+}
+
+void TCPSocketState::SetPendingTransition(TransitionType pending_transition) {
+  DCHECK(IsValidTransition(pending_transition));
+  pending_transition_ = pending_transition;
+}
+
+void TCPSocketState::CompletePendingTransition(bool success) {
+  switch (pending_transition_) {
+    case NONE:
+      NOTREACHED();
+      break;
+    case BIND:
+      if (success)
+        state_ = BOUND;
+      break;
+    case CONNECT:
+      state_ = success ? CONNECTED : CLOSED;
+      break;
+    case SSL_CONNECT:
+      state_ = success ? SSL_CONNECTED : CLOSED;
+      break;
+    case LISTEN:
+      if (success)
+        state_ = LISTENING;
+      break;
+    case CLOSE:
+      state_ = CLOSED;
+      break;
+  }
+  pending_transition_ = NONE;
+}
+
+void TCPSocketState::DoTransition(TransitionType transition, bool success) {
+  SetPendingTransition(transition);
+  CompletePendingTransition(success);
+}
+
+bool TCPSocketState::IsValidTransition(TransitionType transition) const {
+  if (pending_transition_ != NONE && transition != CLOSE)
+    return false;
+
+  switch (transition) {
+    case NONE:
+      return false;
+    case BIND:
+      return state_ == INITIAL;
+    case CONNECT:
+      return state_ == INITIAL || state_ == BOUND;
+    case SSL_CONNECT:
+      return state_ == CONNECTED;
+    case LISTEN:
+      return state_ == BOUND;
+    case CLOSE:
+      return true;
+  }
+  NOTREACHED();
+  return false;
+}
+
+bool TCPSocketState::IsPending(TransitionType transition) const {
+  return pending_transition_ == transition;
+}
+
+bool TCPSocketState::IsConnected() const {
+  return state_ == CONNECTED || state_ == SSL_CONNECTED;
+}
+
+bool TCPSocketState::IsBound() const {
+  return state_ != INITIAL && state_ != CLOSED;
+}
+
+}  // namespace ppapi