502 lines
12 KiB
C++
502 lines
12 KiB
C++
/**
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* vim: set ts=4 :
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* =============================================================================
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* SourceMod
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* Copyright (C) 2004-2008 AlliedModders LLC. All rights reserved.
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* =============================================================================
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*
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* This program is free software; you can redistribute it and/or modify it under
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* the terms of the GNU General Public License, version 3.0, as published by the
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* Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* As a special exception, AlliedModders LLC gives you permission to link the
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* code of this program (as well as its derivative works) to "Half-Life 2," the
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* "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software
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* by the Valve Corporation. You must obey the GNU General Public License in
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* all respects for all other code used. Additionally, AlliedModders LLC grants
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* this exception to all derivative works. AlliedModders LLC defines further
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* exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),
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* or <http://www.sourcemod.net/license.php>.
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*
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* Version: $Id$
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*/
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#include "UserMessages.h"
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#include "sm_stringutil.h"
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UserMessages g_UserMsgs;
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#if SOURCE_ENGINE == SE_LEFT4DEAD
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SH_DECL_HOOK3(IVEngineServer, UserMessageBegin, SH_NOATTRIB, 0, bf_write *, IRecipientFilter *, int, const char *);
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#else
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SH_DECL_HOOK2(IVEngineServer, UserMessageBegin, SH_NOATTRIB, 0, bf_write *, IRecipientFilter *, int);
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#endif
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SH_DECL_HOOK0_void(IVEngineServer, MessageEnd, SH_NOATTRIB, 0);
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UserMessages::UserMessages() : m_InterceptBuffer(m_pBase, 2500)
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{
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m_Names = sm_trie_create();
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m_HookCount = 0;
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m_InExec = false;
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m_InHook = false;
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m_CurFlags = 0;
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m_CurId = INVALID_MESSAGE_ID;
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}
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UserMessages::~UserMessages()
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{
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sm_trie_destroy(m_Names);
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CStack<ListenerInfo *>::iterator iter;
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for (iter=m_FreeListeners.begin(); iter!=m_FreeListeners.end(); iter++)
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{
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delete (*iter);
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}
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m_FreeListeners.popall();
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}
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void UserMessages::OnSourceModStartup(bool late)
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{
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/* -1 means SourceMM was unable to get the user message list */
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m_FallbackSearch = (g_SMAPI->GetUserMessageCount() == -1);
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}
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void UserMessages::OnSourceModAllInitialized()
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{
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g_ShareSys.AddInterface(NULL, this);
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}
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void UserMessages::OnSourceModAllShutdown()
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{
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if (m_HookCount)
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{
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SH_REMOVE_HOOK_MEMFUNC(IVEngineServer, UserMessageBegin, engine, this, &UserMessages::OnStartMessage_Pre, false);
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SH_REMOVE_HOOK_MEMFUNC(IVEngineServer, UserMessageBegin, engine, this, &UserMessages::OnStartMessage_Post, true);
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SH_REMOVE_HOOK_MEMFUNC(IVEngineServer, MessageEnd, engine, this, &UserMessages::OnMessageEnd_Pre, false);
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SH_REMOVE_HOOK_MEMFUNC(IVEngineServer, MessageEnd, engine, this, &UserMessages::OnMessageEnd_Post, true);
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}
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m_HookCount = 0;
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}
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int UserMessages::GetMessageIndex(const char *msg)
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{
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int msgid;
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if (!sm_trie_retrieve(m_Names, msg, reinterpret_cast<void **>(&msgid)))
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{
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if (m_FallbackSearch)
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{
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char msgbuf[64];
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int size;
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msgid = 0;
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while (gamedll->GetUserMessageInfo(msgid, msgbuf, sizeof(msgbuf), size))
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{
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if (strcmp(msgbuf, msg) == 0)
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{
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sm_trie_insert(m_Names, msg, reinterpret_cast<void *>(msgid));
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return msgid;
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}
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msgid++;
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}
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}
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msgid = g_SMAPI->FindUserMessage(msg);
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if (msgid != INVALID_MESSAGE_ID)
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{
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sm_trie_insert(m_Names, msg, reinterpret_cast<void *>(msgid));
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}
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}
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return msgid;
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}
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bool UserMessages::GetMessageName(int msgid, char *buffer, size_t maxlength) const
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{
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if (m_FallbackSearch)
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{
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int size;
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return gamedll->GetUserMessageInfo(msgid, buffer, maxlength, size);
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}
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const char *msg = g_SMAPI->GetUserMessage(msgid);
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if (msg)
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{
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strncopy(buffer, msg, maxlength);
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return true;
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}
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return false;
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}
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bf_write *UserMessages::StartMessage(int msg_id, const cell_t players[], unsigned int playersNum, int flags)
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{
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bf_write *buffer;
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if (m_InExec || m_InHook)
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{
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return NULL;
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}
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if (msg_id < 0 || msg_id >= 255)
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{
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return NULL;
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}
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m_CellRecFilter.Initialize(players, playersNum);
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m_CurFlags = flags;
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if (m_CurFlags & USERMSG_INITMSG)
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{
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m_CellRecFilter.SetToInit(true);
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}
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if (m_CurFlags & USERMSG_RELIABLE)
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{
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m_CellRecFilter.SetToReliable(true);
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}
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m_InExec = true;
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if (m_CurFlags & USERMSG_BLOCKHOOKS)
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{
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#if SOURCE_ENGINE == SE_LEFT4DEAD
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buffer = ENGINE_CALL(UserMessageBegin)(static_cast<IRecipientFilter *>(&m_CellRecFilter), msg_id, g_SMAPI->GetUserMessage(msg_id));
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#else
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buffer = ENGINE_CALL(UserMessageBegin)(static_cast<IRecipientFilter *>(&m_CellRecFilter), msg_id);
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#endif
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} else {
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#if SOURCE_ENGINE == SE_LEFT4DEAD
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buffer = engine->UserMessageBegin(static_cast<IRecipientFilter *>(&m_CellRecFilter), msg_id, g_SMAPI->GetUserMessage(msg_id));
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#else
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buffer = engine->UserMessageBegin(static_cast<IRecipientFilter *>(&m_CellRecFilter), msg_id);
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#endif
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}
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return buffer;
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}
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bool UserMessages::EndMessage()
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{
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if (!m_InExec)
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{
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return false;
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}
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if (m_CurFlags & USERMSG_BLOCKHOOKS)
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{
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ENGINE_CALL(MessageEnd)();
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} else {
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engine->MessageEnd();
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}
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m_InExec = false;
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m_CurFlags = 0;
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m_CellRecFilter.Reset();
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return true;
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}
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bool UserMessages::HookUserMessage(int msg_id, IUserMessageListener *pListener, bool intercept)
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{
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if (msg_id < 0 || msg_id >= 255)
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{
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return false;
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}
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ListenerInfo *pInfo;
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if (m_FreeListeners.empty())
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{
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pInfo = new ListenerInfo;
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} else {
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pInfo = m_FreeListeners.front();
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m_FreeListeners.pop();
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}
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pInfo->Callback = pListener;
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pInfo->IsHooked = false;
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pInfo->KillMe = false;
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if (!m_HookCount++)
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{
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SH_ADD_HOOK_MEMFUNC(IVEngineServer, UserMessageBegin, engine, this, &UserMessages::OnStartMessage_Pre, false);
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SH_ADD_HOOK_MEMFUNC(IVEngineServer, UserMessageBegin, engine, this, &UserMessages::OnStartMessage_Post, true);
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SH_ADD_HOOK_MEMFUNC(IVEngineServer, MessageEnd, engine, this, &UserMessages::OnMessageEnd_Pre, false);
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SH_ADD_HOOK_MEMFUNC(IVEngineServer, MessageEnd, engine, this, &UserMessages::OnMessageEnd_Post, true);
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}
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if (intercept)
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{
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m_msgIntercepts[msg_id].push_back(pInfo);
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} else {
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m_msgHooks[msg_id].push_back(pInfo);
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}
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return true;
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}
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bool UserMessages::UnhookUserMessage(int msg_id, IUserMessageListener *pListener, bool intercept)
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{
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MsgList *pList;
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MsgIter iter;
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ListenerInfo *pInfo;
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bool deleted = false;
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if (msg_id < 0 || msg_id >= 255)
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{
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return false;
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}
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pList = (intercept) ? &m_msgIntercepts[msg_id] : &m_msgHooks[msg_id];
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for (iter=pList->begin(); iter!=pList->end(); iter++)
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{
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pInfo = (*iter);
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if (pInfo->Callback == pListener)
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{
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if (pInfo->IsHooked)
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{
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pInfo->KillMe = true;
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return true;
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}
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pList->erase(iter);
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deleted = true;
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break;
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}
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}
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if (deleted)
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{
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_DecRefCounter();
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}
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return deleted;
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}
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void UserMessages::_DecRefCounter()
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{
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if (--m_HookCount == 0)
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{
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SH_REMOVE_HOOK_MEMFUNC(IVEngineServer, UserMessageBegin, engine, this, &UserMessages::OnStartMessage_Pre, false);
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SH_REMOVE_HOOK_MEMFUNC(IVEngineServer, UserMessageBegin, engine, this, &UserMessages::OnStartMessage_Post, true);
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SH_REMOVE_HOOK_MEMFUNC(IVEngineServer, MessageEnd, engine, this, &UserMessages::OnMessageEnd_Pre, false);
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SH_REMOVE_HOOK_MEMFUNC(IVEngineServer, MessageEnd, engine, this, &UserMessages::OnMessageEnd_Post, true);
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}
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}
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#if SOURCE_ENGINE == SE_LEFT4DEAD
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bf_write *UserMessages::OnStartMessage_Pre(IRecipientFilter *filter, int msg_type, const char *msg_name)
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#else
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bf_write *UserMessages::OnStartMessage_Pre(IRecipientFilter *filter, int msg_type)
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#endif
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{
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bool is_intercept_empty = m_msgIntercepts[msg_type].empty();
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bool is_hook_empty = m_msgHooks[msg_type].empty();
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if ((is_intercept_empty && is_hook_empty)
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|| (m_InExec && (m_CurFlags & USERMSG_BLOCKHOOKS)))
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{
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m_InHook = false;
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RETURN_META_VALUE(MRES_IGNORED, NULL);
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}
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m_CurId = msg_type;
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m_CurRecFilter = filter;
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m_InHook = true;
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m_BlockEndPost = false;
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if (!is_intercept_empty)
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{
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m_InterceptBuffer.Reset();
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RETURN_META_VALUE(MRES_SUPERCEDE, &m_InterceptBuffer);
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}
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RETURN_META_VALUE(MRES_IGNORED, NULL);
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}
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#if SOURCE_ENGINE == SE_LEFT4DEAD
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bf_write *UserMessages::OnStartMessage_Post(IRecipientFilter *filter, int msg_type, const char *msg_name)
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#else
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bf_write *UserMessages::OnStartMessage_Post(IRecipientFilter *filter, int msg_type)
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#endif
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{
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if (!m_InHook)
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{
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RETURN_META_VALUE(MRES_IGNORED, NULL);
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}
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m_OrigBuffer = META_RESULT_ORIG_RET(bf_write *);
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RETURN_META_VALUE(MRES_IGNORED, NULL);
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}
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void UserMessages::OnMessageEnd_Post()
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{
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if (!m_InHook || m_BlockEndPost)
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{
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RETURN_META(MRES_IGNORED);
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}
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MsgList *pList;
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MsgIter iter;
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ListenerInfo *pInfo;
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pList = &m_msgIntercepts[m_CurId];
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for (iter=pList->begin(); iter!=pList->end(); )
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{
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pInfo = (*iter);
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pInfo->IsHooked = true;
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pInfo->Callback->OnUserMessageSent(m_CurId);
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if (pInfo->KillMe)
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{
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iter = pList->erase(iter);
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m_FreeListeners.push(pInfo);
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_DecRefCounter();
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continue;
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}
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pInfo->IsHooked = false;
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iter++;
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}
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m_InHook = false;
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pList = &m_msgHooks[m_CurId];
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for (iter=pList->begin(); iter!=pList->end(); )
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{
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pInfo = (*iter);
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pInfo->IsHooked = true;
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pInfo->Callback->OnUserMessageSent(m_CurId);
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if (pInfo->KillMe)
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{
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iter = pList->erase(iter);
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m_FreeListeners.push(pInfo);
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_DecRefCounter();
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continue;
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}
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pInfo->IsHooked = false;
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iter++;
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}
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}
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void UserMessages::OnMessageEnd_Pre()
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{
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if (!m_InHook)
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{
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RETURN_META(MRES_IGNORED);
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}
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MsgList *pList;
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MsgIter iter;
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ListenerInfo *pInfo;
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ResultType res;
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bool intercepted = false;
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bool handled = false;
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pList = &m_msgIntercepts[m_CurId];
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for (iter=pList->begin(); iter!=pList->end(); )
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{
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pInfo = (*iter);
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pInfo->IsHooked = true;
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res = pInfo->Callback->InterceptUserMessage(m_CurId, &m_InterceptBuffer, m_CurRecFilter);
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intercepted = true;
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switch (res)
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{
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case Pl_Stop:
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{
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if (pInfo->KillMe)
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{
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pList->erase(iter);
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m_FreeListeners.push(pInfo);
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_DecRefCounter();
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goto supercede;
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}
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pInfo->IsHooked = false;
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goto supercede;
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}
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case Pl_Handled:
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{
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handled = true;
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if (pInfo->KillMe)
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{
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iter = pList->erase(iter);
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m_FreeListeners.push(pInfo);
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_DecRefCounter();
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continue;
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}
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break;
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}
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default:
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{
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if (pInfo->KillMe)
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{
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iter = pList->erase(iter);
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m_FreeListeners.push(pInfo);
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_DecRefCounter();
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continue;
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}
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break;
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}
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}
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pInfo->IsHooked = false;
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iter++;
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}
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if (handled)
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{
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goto supercede;
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}
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if (intercepted)
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{
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bf_write *engine_bfw;
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#if SOURCE_ENGINE == SE_LEFT4DEAD
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engine_bfw = ENGINE_CALL(UserMessageBegin)(m_CurRecFilter, m_CurId, g_SMAPI->GetUserMessage(m_CurId));
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#else
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engine_bfw = ENGINE_CALL(UserMessageBegin)(m_CurRecFilter, m_CurId);
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#endif
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m_ReadBuffer.StartReading(m_InterceptBuffer.GetBasePointer(), m_InterceptBuffer.GetNumBytesWritten());
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engine_bfw->WriteBitsFromBuffer(&m_ReadBuffer, m_InterceptBuffer.GetNumBitsWritten());
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ENGINE_CALL(MessageEnd)();
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}
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pList = &m_msgHooks[m_CurId];
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for (iter=pList->begin(); iter!=pList->end(); )
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{
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pInfo = (*iter);
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pInfo->IsHooked = true;
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pInfo->Callback->OnUserMessage(m_CurId, m_OrigBuffer, m_CurRecFilter);
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if (pInfo->KillMe)
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{
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iter = pList->erase(iter);
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m_FreeListeners.push(pInfo);
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_DecRefCounter();
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continue;
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}
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pInfo->IsHooked = false;
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iter++;
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}
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RETURN_META((intercepted) ? MRES_SUPERCEDE : MRES_IGNORED);
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supercede:
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m_InHook = false;
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m_BlockEndPost = true;
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RETURN_META(MRES_SUPERCEDE);
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}
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