/**

  * vim: set ts=4 :

  * =============================================================================

  * SourceMod

  * Copyright (C) 2004-2008 AlliedModders LLC.  All rights reserved.

  * =============================================================================

  *

  * This program is free software; you can redistribute it and/or modify it under

  * the terms of the GNU General Public License, version 3.0, as published by the

  * Free Software Foundation.

  * 

  * 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/>.

  *

  * As a special exception, AlliedModders LLC gives you permission to link the

  * code of this program (as well as its derivative works) to "Half-Life 2," the

  * "Source Engine," the "SourcePawn JIT," and any Game MODs that run on software

  * by the Valve Corporation.  You must obey the GNU General Public License in

  * all respects for all other code used.  Additionally, AlliedModders LLC grants

  * this exception to all derivative works.  AlliedModders LLC defines further

  * exceptions, found in LICENSE.txt (as of this writing, version JULY-31-2007),

  * or <http://www.sourcemod.net/license.php>.

  *

  * Version: $Id$

  */

 #include <string.h>

 #include <stdlib.h>

 #include "GameConfigs.h"

 #include "sm_stringutil.h"

 #include "sourcemod.h"

 #include "sourcemm_api.h"

 #include "HalfLife2.h"

 #include "Logger.h"

 #include "ShareSys.h"

 #include "MemoryUtils.h"

 #include "LibrarySys.h"

 #include "HandleSys.h"

 #include "sm_crc32.h"

 #include "GameDataFetcher.h"

 #if defined PLATFORM_LINUX

 #include <dlfcn.h>

 #endif

 GameConfigManager g_GameConfigs;

 IGameConfig *g_pGameConf = NULL;

 char g_Game[256];

 char g_GameDesc[256] = {'!', '\0'};

 char g_GameName[256] = {'$', '\0'};

 #define PSTATE_NONE						0

 #define PSTATE_GAMES					1

 #define PSTATE_GAMEDEFS					2

 #define PSTATE_GAMEDEFS_OFFSETS			3

 #define PSTATE_GAMEDEFS_OFFSETS_OFFSET	4

 #define PSTATE_GAMEDEFS_KEYS			5

 #define PSTATE_GAMEDEFS_SUPPORTED		6

 #define PSTATE_GAMEDEFS_SIGNATURES		7

 #define PSTATE_GAMEDEFS_SIGNATURES_SIG	8

 #define PSTATE_GAMEDEFS_CRC				9

 #define PSTATE_GAMEDEFS_CRC_BINARY		10

 #if defined PLATFORM_WINDOWS

 #define PLATFORM_NAME				"windows"

 #define PLATFORM_SERVER_BINARY		"server.dll"

 #elif defined PLATFORM_LINUX

 #define PLATFORM_NAME				"linux"

 #define PLATFORM_SERVER_BINARY		"server_i486.so"

 #endif

 struct TempSigInfo

 {

 	void Reset()

 	{

 		library[0] = '\0';

 		sig[0] = '\0';

 	}

 	char sig[512];

 	char library[64];

 } s_TempSig;

 unsigned int s_ServerBinCRC;

 bool s_ServerBinCRC_Ok = false;

 CGameConfig::CGameConfig(const char *file)

 {

 	m_pFile = sm_strdup(file);

 	m_pOffsets = sm_trie_create();

 	m_pProps = sm_trie_create();

 	m_pKeys = sm_trie_create();

 	m_pSigs = sm_trie_create();

 	m_pStrings = new BaseStringTable(512);

 	m_RefCount = 0;

 }

 CGameConfig::~CGameConfig()

 {

 	sm_trie_destroy(m_pOffsets);

 	sm_trie_destroy(m_pProps);

 	sm_trie_destroy(m_pKeys);

 	sm_trie_destroy(m_pSigs);

 	delete [] m_pFile;

 	delete m_pStrings;

 }

 SMCResult CGameConfig::ReadSMC_NewSection(const SMCStates *states, const char *name)

 {

 	if (m_IgnoreLevel)

 	{

 		m_IgnoreLevel++;

 		return SMCResult_Continue;

 	}

 	switch (m_ParseState)

 	{

 	case PSTATE_NONE:

 		{

 			if (strcmp(name, "Games") == 0)

 			{

 				m_ParseState = PSTATE_GAMES;

 			} else {

 				m_IgnoreLevel++;

 			}

 			break;

 		}

 	case PSTATE_GAMES:

 		{

 			if ((strcmp(name, "*") == 0)

 				|| (strcmp(name, "#default") == 0)

 				|| (strcasecmp(name, g_Game) == 0)

 				|| (strcasecmp(name, g_GameDesc) == 0)

 				|| (strcasecmp(name, g_GameName) == 0))

 			{

 				bShouldBeReadingDefault = true;

 				m_ParseState = PSTATE_GAMEDEFS;

 				strncopy(m_Game, name, sizeof(m_Game));

 			} else {

 				m_IgnoreLevel++;

 			}

 			break;

 		}

 	case PSTATE_GAMEDEFS:

 		{

 			if (strcmp(name, "Offsets") == 0)

 			{

 				m_ParseState = PSTATE_GAMEDEFS_OFFSETS;

 			}

 			else if (strcmp(name, "Keys") == 0)

 			{

 				m_ParseState = PSTATE_GAMEDEFS_KEYS;

 			}

 			else if ((strcmp(name, "#supported") == 0)

 					 && (strcmp(m_Game, "#default") == 0))

 			{

 				m_ParseState = PSTATE_GAMEDEFS_SUPPORTED;

 				/* Ignore this section unless we get a game. */

 				bShouldBeReadingDefault = false;

 			}

 			else if (strcmp(name, "Signatures") == 0)

 			{

 				m_ParseState = PSTATE_GAMEDEFS_SIGNATURES;

 			}

 			else if (strcmp(name, "CRC") == 0)

 			{

 				m_ParseState = PSTATE_GAMEDEFS_CRC;

 				bShouldBeReadingDefault = false;

 			}

 			else

 			{

 				m_IgnoreLevel++;

 			}

 			break;

 		}

 	case PSTATE_GAMEDEFS_OFFSETS:

 		{

 			m_Prop[0] = '\0';

 			m_Class[0] = '\0';

 			strncopy(m_offset, name, sizeof(m_offset));

 			m_ParseState = PSTATE_GAMEDEFS_OFFSETS_OFFSET;

 			break;

 		}

 	case PSTATE_GAMEDEFS_SIGNATURES:

 		{

 			strncopy(m_offset, name, sizeof(m_offset));

 			s_TempSig.Reset();

 			m_ParseState = PSTATE_GAMEDEFS_SIGNATURES_SIG;

 			break;

 		}

 	case PSTATE_GAMEDEFS_CRC:

 		{

 			char error[255];

 			error[0] = '\0';

 			if (strcmp(name, "server") != 0)

 			{

 				UTIL_Format(error, sizeof(error), "Unrecognized library \"%s\"", name);

 			} 

 			else if (!s_ServerBinCRC_Ok)

 			{

 				FILE *fp;

 				char path[PLATFORM_MAX_PATH];

 				g_SourceMod.BuildPath(Path_Game, path, sizeof(path), "bin/" PLATFORM_SERVER_BINARY);

 				if ((fp = fopen(path, "rb")) == NULL)

 				{

 					UTIL_Format(error, sizeof(error), "Could not open binary: %s", path);

 				} else {

 					size_t size;

 					void *buffer;

 					fseek(fp, 0, SEEK_END);

 					size = ftell(fp);

 					fseek(fp, 0, SEEK_SET);

 					buffer = malloc(size);

 					fread(buffer, size, 1, fp);

 					s_ServerBinCRC = UTIL_CRC32(buffer, size);

 					free(buffer);

 					s_ServerBinCRC_Ok = true;

 				}

 			}

 			if (error[0] != '\0')

 			{

 				m_IgnoreLevel = 1;

 				g_Logger.LogError("[SM] Error while parsing CRC section for \"%s\" (%s):", m_Game, m_pFile);

 				g_Logger.LogError("[SM] %s", error);

 			} else {

 				m_ParseState = PSTATE_GAMEDEFS_CRC_BINARY;

 			}

 			break;

 		}

 	/* No sub-sections allowed:

 	 case PSTATE_GAMEDEFS_OFFSETS_OFFSET:

 	 case PSTATE_GAMEDEFS_KEYS:

 	 case PSTATE_GAMEDEFS_SUPPORTED:

 	 case PSTATE_GAMEDEFS_SIGNATURES_SIG:

 	 case PSTATE_GAMEDEFS_CRC_BINARY:

 	 */

 	default:

 		{

 			/* If we don't know what we got, start ignoring */

 			m_IgnoreLevel++;

 			break;

 		}

 	}

 	return SMCResult_Continue;

 }

 SMCResult CGameConfig::ReadSMC_KeyValue(const SMCStates *states, const char *key, const char *value)

 {

 	if (m_IgnoreLevel)

 	{

 		return SMCResult_Continue;

 	}

 	if (m_ParseState == PSTATE_GAMEDEFS_OFFSETS_OFFSET)

 	{

 		if (strcmp(key, "class") == 0)

 		{

 			strncopy(m_Class, value, sizeof(m_Class));

 		} else if (strcmp(key, "prop") == 0) {

 			strncopy(m_Prop, value, sizeof(m_Prop));

 		} else if (strcmp(key, PLATFORM_NAME) == 0) {

 			int val = atoi(value);

 			sm_trie_replace(m_pOffsets, m_offset, (void *)val);

 		}

 	} else if (m_ParseState == PSTATE_GAMEDEFS_KEYS) {

 		int id = m_pStrings->AddString(value);

 		sm_trie_replace(m_pKeys, key, (void *)id);

 	} else if (m_ParseState == PSTATE_GAMEDEFS_SUPPORTED) {

 		if (strcmp(key, "game") == 0

 			&& (strcasecmp(value, g_Game) == 0 

 				|| strcasecmp(value, g_GameDesc) == 0

 				|| strcasecmp(value, g_GameName) == 0)

 				)

 		{

 			bShouldBeReadingDefault = true;

 		}

 	} else if (m_ParseState == PSTATE_GAMEDEFS_SIGNATURES_SIG) {

 		if (strcmp(key, PLATFORM_NAME) == 0)

 		{

 			strncopy(s_TempSig.sig, value, sizeof(s_TempSig.sig));

 		} else if (strcmp(key, "library") == 0) {

 			strncopy(s_TempSig.library, value, sizeof(s_TempSig.library));

 		}

 	} else if (m_ParseState == PSTATE_GAMEDEFS_CRC_BINARY) {

 		if (strcmp(key, PLATFORM_NAME) == 0 

 			&& s_ServerBinCRC_Ok

 			&& !bShouldBeReadingDefault)

 		{

 			unsigned int crc = 0;

 			sscanf(value, "%08X", &crc);

 			if (s_ServerBinCRC == crc)

 			{

 				bShouldBeReadingDefault = true;

 			}

 		}

 	}

 	return SMCResult_Continue;

 }

 SMCResult CGameConfig::ReadSMC_LeavingSection(const SMCStates *states)

 {

 	if (m_IgnoreLevel)

 	{

 		m_IgnoreLevel--;

 		return SMCResult_Continue;

 	}

 	switch (m_ParseState)

 	{

 	case PSTATE_GAMES:

 		{

 			m_ParseState = PSTATE_NONE;

 			break;

 		}

 	case PSTATE_GAMEDEFS:

 		{

 			m_ParseState = PSTATE_GAMES;

 			break;

 		}

 	case PSTATE_GAMEDEFS_KEYS:

 	case PSTATE_GAMEDEFS_OFFSETS:

 		{

 			m_ParseState = PSTATE_GAMEDEFS;

 			break;

 		}

 	case PSTATE_GAMEDEFS_OFFSETS_OFFSET:

 		{

 			/* Parse the offset... */

 			if (m_Class[0] != '\0'

 				&& m_Prop[0] != '\0')

 			{

 				SendProp *pProp = g_HL2.FindInSendTable(m_Class, m_Prop);

 				if (pProp)

 				{

 					int val = pProp->GetOffset();

 					sm_trie_replace(m_pOffsets, m_offset, (void *)val);

 					sm_trie_replace(m_pProps, m_offset, pProp);

 				} else {

 					/* Check if it's a non-default game and no offsets exist */

 					if (((strcmp(m_Game, "*") != 0) && strcmp(m_Game, "#default") != 0)

 						&& (!sm_trie_retrieve(m_pOffsets, m_offset, NULL)))

 					{

 						g_Logger.LogError("[SM] Unable to find property %s.%s (file \"%s\") (mod \"%s\")", 

 							m_Class,

 							m_Prop,

 							m_pFile,

 							m_Game);

 					}

 				}

 			}

 			m_ParseState = PSTATE_GAMEDEFS_OFFSETS;

 			break;

 		}

 	case PSTATE_GAMEDEFS_CRC:

 	case PSTATE_GAMEDEFS_SUPPORTED:

 		{

 			if (!bShouldBeReadingDefault)

 			{

 				/* If we shouldn't read the rest of this section, set the ignore level. */

 				m_IgnoreLevel = 1;

 				m_ParseState = PSTATE_GAMES;

 			} else {

 				m_ParseState = PSTATE_GAMEDEFS;

 			}

 			break;

 		}

 	case PSTATE_GAMEDEFS_CRC_BINARY:

 		{

 			m_ParseState = PSTATE_GAMEDEFS_CRC;

 			break;

 		}

 	case PSTATE_GAMEDEFS_SIGNATURES:

 		{

 			m_ParseState = PSTATE_GAMEDEFS;

 			break;

 		}

 	case PSTATE_GAMEDEFS_SIGNATURES_SIG:

 		{

 			if (s_TempSig.library[0] == '\0')

 			{

 				/* assume server */

 				strncopy(s_TempSig.library, "server", sizeof(s_TempSig.library));

 			}

 			void *addrInBase = NULL;

 			if (strcmp(s_TempSig.library, "server") == 0)

 			{

 				addrInBase = (void *)g_SMAPI->GetServerFactory(false);

 			} else if (strcmp(s_TempSig.library, "engine") == 0) {

 				addrInBase = (void *)g_SMAPI->GetEngineFactory(false);

 			}

 			void *final_addr = NULL;

 			if (addrInBase == NULL)

 			{

 				g_Logger.LogError("[SM] Unrecognized library \"%s\" (gameconf \"%s\")", 

 					s_TempSig.library, 

 					m_pFile);

 			} else {

 #if defined PLATFORM_LINUX

 				if (s_TempSig.sig[0] == '@')

 				{

 					Dl_info info;

 					/* GNU only: returns 0 on error, inconsistent! >:[ */

 					if (dladdr(addrInBase, &info) != 0)

 					{

 						void *handle = dlopen(info.dli_fname, RTLD_NOW);

 						if (handle)

 						{

 							final_addr = dlsym(handle, &s_TempSig.sig[1]);

 							dlclose(handle);

 						} else {

 							g_Logger.LogError("[SM] Unable to load library \"%s\" (gameconf \"%s\")",

 								s_TempSig.library,

 								m_pFile);

 						}

 					} else {

 						g_Logger.LogError("[SM] Unable to find library \"%s\" in memory (gameconf \"%s\")",

 							s_TempSig.library,

 							m_pFile);

 					}

 				}

 				if (final_addr)

 				{

 					goto skip_find;

 				}

 #endif

 				/* First, preprocess the signature */

 				char real_sig[511];

 				size_t real_bytes;

 				size_t length;

 				real_bytes = 0;

 				length = strlen(s_TempSig.sig);

 				for (size_t i=0; i<length; i++)

 				{

 					if (real_bytes >= sizeof(real_sig))

 					{

 						break;

 					}

 					real_sig[real_bytes++] = s_TempSig.sig[i];

 					if (s_TempSig.sig[i] == '\\'

 						&& s_TempSig.sig[i+1] == 'x')

 					{

 						if (i + 3 >= length)

 						{

 							continue;

 						}

 						/* Get the hex part */

 						char s_byte[3];

 						int r_byte;

 						s_byte[0] = s_TempSig.sig[i+2];

 						s_byte[1] = s_TempSig.sig[i+3];

 						s_byte[2] = '\0';

 						/* Read it as an integer */

 						sscanf(s_byte, "%x", &r_byte);

 						/* Save the value */

 						real_sig[real_bytes-1] = r_byte;

 						/* Adjust index */

 						i += 3;

 					}

 				}

 				if (real_bytes >= 1)

 				{

 					final_addr = g_MemUtils.FindPattern(addrInBase, real_sig, real_bytes);

 				}

 			}

 #if defined PLATFORM_LINUX

 skip_find:

 #endif

 			sm_trie_replace(m_pSigs, m_offset, final_addr);

 			m_ParseState = PSTATE_GAMEDEFS_SIGNATURES;

 			break;

 		}

 	}

 	return SMCResult_Continue;

 }

 bool CGameConfig::Reparse(char *error, size_t maxlength)

 {

 	SMCError err;

 	SMCStates state = {0, 0};

 	char path[PLATFORM_MAX_PATH];

 	g_SourceMod.BuildPath(Path_SM, path, sizeof(path), "gamedata/%s.txt", m_pFile);

 	/* Backwards compatibility */

 	if (!g_LibSys.PathExists(path))

 	{

 		g_SourceMod.BuildPath(Path_SM, path, sizeof(path), "configs/gamedata/%s.txt", m_pFile);

 	}

 	/* Initialize parse states */

 	m_IgnoreLevel = 0;

 	bShouldBeReadingDefault = true;

 	m_ParseState = PSTATE_NONE;

 	/* Reset cached data */

 	m_pStrings->Reset();

 	sm_trie_clear(m_pOffsets);

 	sm_trie_clear(m_pProps);

 	sm_trie_clear(m_pKeys);

 	if ((err=textparsers->ParseSMCFile(path, this, &state, error, maxlength))

 		!= SMCError_Okay)

 	{

 		const char *msg;

 		msg = textparsers->GetSMCErrorString(err);

 		g_Logger.LogError("[SM] Error parsing gameconfig file \"%s\":", path);

 		g_Logger.LogError("[SM] Error %d on line %d, col %d: %s", 

 			err,

 			state.line,

 			state.col,

 			msg ? msg : "Unknown error");

 		return false;

 	}

 	return true;

 }

 bool CGameConfig::GetOffset(const char *key, int *value)

 {

 	void *obj;

 	if (!sm_trie_retrieve(m_pOffsets, key, &obj))

 	{

 		return false;

 	}

 	*value = (int)obj;

 	return true;

 }

 const char *CGameConfig::GetKeyValue(const char *key)

 {

 	void *obj;

 	if (!sm_trie_retrieve(m_pKeys, key, &obj))

 	{

 		return NULL;

 	}

 	return m_pStrings->GetString((int)obj);

 }

 SendProp *CGameConfig::GetSendProp(const char *key)

 {

 	SendProp *pProp;

 	if (!sm_trie_retrieve(m_pProps, key, (void **)&pProp))

 	{

 		return NULL;

 	}

 	return pProp;

 }

 bool CGameConfig::GetMemSig(const char *key, void **addr)

 {

 	return sm_trie_retrieve(m_pSigs, key, addr);

 }

 void CGameConfig::IncRefCount()

 {

 	m_RefCount++;

 }

 unsigned int CGameConfig::DecRefCount()

 {

 	m_RefCount--;

 	return m_RefCount;

 }

 GameConfigManager::GameConfigManager()

 {

 	m_pLookup = sm_trie_create();

 }

 GameConfigManager::~GameConfigManager()

 {

 	sm_trie_destroy(m_pLookup);

 }

 void GameConfigManager::OnSourceModStartup(bool late)

 {

 	LoadGameConfigFile("core.games", &g_pGameConf, NULL, 0);

 	strncopy(g_Game, g_SourceMod.GetGameFolderName(), sizeof(g_Game));

 	strncopy(g_GameDesc + 1, SERVER_CALL(GetGameDescription)(), sizeof(g_GameDesc) - 1);

 	KeyValues *pGameInfo = new KeyValues("GameInfo");

 	if (g_HL2.KVLoadFromFile(pGameInfo, basefilesystem, "gameinfo.txt"))

 	{

 		const char *str;

 		if ((str = pGameInfo->GetString("game", NULL)) != NULL)

 		{

 			strncopy(g_GameName + 1, str, sizeof(g_GameName) - 1);

 		}

 	}

 	pGameInfo->deleteThis();

 }

 void GameConfigManager::OnSourceModAllInitialized()

 {

 	/* NOW initialize the game file */

 	CGameConfig *pGameConf = (CGameConfig *)g_pGameConf;

 	char error[255];

 	if (!pGameConf->Reparse(error, sizeof(error)))

 	{

 		/* :TODO: log */

 	}

 	g_ShareSys.AddInterface(NULL, this);

 }

 void GameConfigManager::OnSourceModAllShutdown()

 {

 	CloseGameConfigFile(g_pGameConf);

 }

 bool GameConfigManager::LoadGameConfigFile(const char *file, IGameConfig **_pConfig, char *error, size_t maxlength)

 {

 	/* A crash was detected during last load - We block the gamedata loading so it hopefully won't happen again */

 	if (g_blockGameDataLoad)

 	{

 		UTIL_Format(error, maxlength, "GameData loaded blocked due to detected crash");

 		return false;

 	}

 	CGameConfig *pConfig;

 	if (sm_trie_retrieve(m_pLookup, file, (void **)&pConfig))

 	{

 		pConfig->IncRefCount();

 		*_pConfig = pConfig;

 		return true;

 	}

 	pConfig = new CGameConfig(file);

 	/* :HACKHACK: Don't parse the main config file */

 	bool retval = true;

 	if (_pConfig != &g_pGameConf)

 	{

 		retval = pConfig->Reparse(error, maxlength);

 	}

 	m_cfgs.push_back(pConfig);

 	sm_trie_insert(m_pLookup, file, pConfig);

 	pConfig->IncRefCount();

 	*_pConfig = pConfig;

 	return retval;

 }

 void GameConfigManager::CloseGameConfigFile(IGameConfig *cfg)

 {

 	CGameConfig *pConfig = (CGameConfig *)cfg;

 	if (pConfig->DecRefCount() == 0)

 	{

 		sm_trie_delete(m_pLookup, pConfig->m_pFile);

 		delete pConfig;

 	}

 }

 extern HandleType_t g_GameConfigsType;

 IGameConfig *GameConfigManager::ReadHandle(Handle_t hndl, IdentityToken_t *ident, HandleError *err)

 {

 	HandleSecurity sec(ident, g_pCoreIdent);

 	IGameConfig *conf = NULL;

 	HandleError _err = g_HandleSys.ReadHandle(hndl, g_GameConfigsType, &sec, (void **)&conf);

 	if (err)

 	{

 		*err = _err;

 	}

 	return conf;

 }