Core/Creatures: backported trainer update and skill initialization

src/server/game/Server/Packets/NPCPackets.cpp

@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2008-2018 TrinityCore <https://www.trinitycore.org/>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+ * Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "NPCPackets.h"
+
+void WorldPackets::NPC::Hello::Read()
+{
+    _worldPacket >> Unit;
+}
+
+WorldPacket const* WorldPackets::NPC::TrainerList::Write()
+{
+    _worldPacket << TrainerGUID;
+    _worldPacket << uint32(TrainerType);
+    _worldPacket << uint32(TrainerID);
+
+    _worldPacket << uint32(Spells.size());
+    for (TrainerListSpell const& spell : Spells)
+    {
+        _worldPacket << uint32(spell.SpellID);
+        _worldPacket << uint8(spell.Usable);
+        _worldPacket << uint32(spell.MoneyCost);
+        _worldPacket << uint8(spell.ReqLevel);
+        _worldPacket << uint32(spell.ReqSkillLine);
+        _worldPacket << uint32(spell.ReqSkillRank);
+        _worldPacket.append(spell.ReqAbility.data(), spell.ReqAbility.size());
+        _worldPacket << uint32(spell.ProfessionDialog);
+        _worldPacket << uint32(spell.ProfessionButton);
+    }
+
+    _worldPacket << Greeting;
+
+    return &_worldPacket;
+}
+
+void WorldPackets::NPC::TrainerBuySpell::Read()
+{
+    _worldPacket >> TrainerGUID;
+    _worldPacket >> TrainerID;
+    _worldPacket >> SpellID;
+}
+
+WorldPacket const* WorldPackets::NPC::TrainerBuyFailed::Write()
+{
+    _worldPacket << TrainerGUID;
+    _worldPacket << int32(SpellID);
+    _worldPacket << int32(TrainerFailedReason);
+
+    return &_worldPacket;
+}
+
+WorldPacket const* WorldPackets::NPC::TrainerBuySucceeded::Write()
+{
+    _worldPacket << TrainerGUID;
+    _worldPacket << int32(SpellID);
+
+    return &_worldPacket;
+}