Revert of Remove webrtc/libjingle/{xmllite,xmpp}

webrtc/libjingle/xmpp/presencereceivetask.cc

Index: webrtc/libjingle/xmpp/presencereceivetask.cc
diff --git a/webrtc/libjingle/xmpp/presencereceivetask.cc b/webrtc/libjingle/xmpp/presencereceivetask.cc
new file mode 100644
index 0000000000000000000000000000000000000000..3ea7274c7605e251d3e841bd278080b84b553a7b
--- /dev/null
+++ b/webrtc/libjingle/xmpp/presencereceivetask.cc
@@ -0,0 +1,141 @@
+/*
+ *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#include "webrtc/libjingle/xmpp/presencereceivetask.h"
+
+#include "webrtc/libjingle/xmpp/constants.h"
+#include "webrtc/base/stringencode.h"
+
+namespace buzz {
+
+static bool IsUtf8FirstByte(int c) {
+  return (((c)&0x80)==0) || // is single byte
+    ((unsigned char)((c)-0xc0)<0x3e); // or is lead byte
+}
+
+PresenceReceiveTask::PresenceReceiveTask(XmppTaskParentInterface* parent)
+ : XmppTask(parent, XmppEngine::HL_TYPE) {
+}
+
+PresenceReceiveTask::~PresenceReceiveTask() {
+  Stop();
+}
+
+int PresenceReceiveTask::ProcessStart() {
+  const XmlElement * stanza = NextStanza();
+  if (stanza == NULL) {
+    return STATE_BLOCKED;
+  }
+
+  Jid from(stanza->Attr(QN_FROM));
+  HandlePresence(from, stanza);
+
+  return STATE_START;
+}
+
+bool PresenceReceiveTask::HandleStanza(const XmlElement * stanza) {
+  // Verify that this is a presence stanze
+  if (stanza->Name() != QN_PRESENCE) {
+    return false; // not sure if this ever happens.
+  }
+
+  // Queue it up
+  QueueStanza(stanza);
+
+  return true;
+}
+
+void PresenceReceiveTask::HandlePresence(const Jid& from,
+                                         const XmlElement* stanza) {
+  if (stanza->Attr(QN_TYPE) == STR_ERROR) {
+    return;
+  }
+
+  PresenceStatus status;
+  DecodeStatus(from, stanza, &status);
+  PresenceUpdate(status);
+}
+
+void PresenceReceiveTask::DecodeStatus(const Jid& from,
+                                       const XmlElement* stanza,
+                                       PresenceStatus* presence_status) {
+  presence_status->set_jid(from);
+  if (stanza->Attr(QN_TYPE) == STR_UNAVAILABLE) {
+    presence_status->set_available(false);
+  } else {
+    presence_status->set_available(true);
+    const XmlElement * status_elem = stanza->FirstNamed(QN_STATUS);
+    if (status_elem != NULL) {
+      presence_status->set_status(status_elem->BodyText());
+
+      // Truncate status messages longer than 300 bytes
+      if (presence_status->status().length() > 300) {
+        size_t len = 300;
+
+        // Be careful not to split legal utf-8 chars in half
+        while (!IsUtf8FirstByte(presence_status->status()[len]) && len > 0) {
+          len -= 1;
+        }
+        std::string truncated(presence_status->status(), 0, len);
+        presence_status->set_status(truncated);
+      }
+    }
+
+    const XmlElement * priority = stanza->FirstNamed(QN_PRIORITY);
+    if (priority != NULL) {
+      int pri;
+      if (rtc::FromString(priority->BodyText(), &pri)) {
+        presence_status->set_priority(pri);
+      }
+    }
+
+    const XmlElement * show = stanza->FirstNamed(QN_SHOW);
+    if (show == NULL || show->FirstChild() == NULL) {
+      presence_status->set_show(PresenceStatus::SHOW_ONLINE);
+    } else if (show->BodyText() == "away") {
+      presence_status->set_show(PresenceStatus::SHOW_AWAY);
+    } else if (show->BodyText() == "xa") {
+      presence_status->set_show(PresenceStatus::SHOW_XA);
+    } else if (show->BodyText() == "dnd") {
+      presence_status->set_show(PresenceStatus::SHOW_DND);
+    } else if (show->BodyText() == "chat") {
+      presence_status->set_show(PresenceStatus::SHOW_CHAT);
+    } else {
+      presence_status->set_show(PresenceStatus::SHOW_ONLINE);
+    }
+
+    const XmlElement * caps = stanza->FirstNamed(QN_CAPS_C);
+    if (caps != NULL) {
+      std::string node = caps->Attr(QN_NODE);
+      std::string ver = caps->Attr(QN_VER);
+      std::string exts = caps->Attr(QN_EXT);
+
+      presence_status->set_know_capabilities(true);
+      presence_status->set_caps_node(node);
+      presence_status->set_version(ver);
+    }
+
+    const XmlElement* delay = stanza->FirstNamed(kQnDelayX);
+    if (delay != NULL) {
+      // Ideally we would parse this according to the Psuedo ISO-8601 rules
+      // that are laid out in JEP-0082:
+      // http://www.jabber.org/jeps/jep-0082.html
+      std::string stamp = delay->Attr(kQnStamp);
+      presence_status->set_sent_time(stamp);
+    }
+
+    const XmlElement* nick = stanza->FirstNamed(QN_NICKNAME);
+    if (nick) {
+      presence_status->set_nick(nick->BodyText());
+    }
+  }
+}
+
+} // namespace buzz