/* ScummVM - Scumm Interpreter
 * Copyright (C) 2001  Ludvig Strigeus
 * Copyright (C) 2001/2002 The ScummVM project
 *
 * 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, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 * $Header$
 *
 */

#include "stdafx.h"
#include "scumm.h"

/* Open a room */
void Scumm::openRoom(int room)
{
	int room_offs, roomlimit;
	char buf[256];

	debug(9, "openRoom(%d)", room);

	/* Don't load the same room again */
	if (_lastLoadedRoom == room)
		return;
	_lastLoadedRoom = room;

	/* Room -1 means close file */
	if (room == -1) {
		_encbyte = 0;
		deleteRoomOffsets();
		fileClose(_fileHandle);
		_fileHandle = NULL;
		return;
	}

	/* Either xxx.lfl or monkey.xxx file name */
	while (!_resFilePrefix) {
#if REAL_CODE
		room_offs = _roomFileOffsets[room];
#else
		if (_features & GF_SMALL_NAMES)
			roomlimit = 98;
		else
			roomlimit = 900;
		if (_features & GF_EXTERNAL_CHARSET && room >= roomlimit)
			room_offs = 0;
		else
			room_offs = room ? _roomFileOffsets[room] : 0;
#endif

		if (room_offs == (int)0xFFFFFFFF)
			break;

		if (room_offs != 0 && room != 0) {
			_fileOffset = _roomFileOffsets[room];
			return;
		}
		if (!(_features & GF_SMALL_HEADER)) {
			if (_features & GF_AFTER_V7)
				sprintf(buf, "%s%s.la%d", _gameDataPath, _exe_name,
								room == 0 ? 0 : res.roomno[rtRoom][room]);
			else
				sprintf(buf, "%s%s.%.3d", _gameDataPath, _exe_name,
								room == 0 ? 0 : res.roomno[rtRoom][room]);
			_encbyte = (_features & GF_USE_KEY) ? 0x69 : 0;
		} else if (!(_features & GF_SMALL_NAMES)) {
			if (room == 0 || room >= 900) {
				sprintf(buf, "%s%.3d.lfl", _gameDataPath, room);
				_encbyte = 0;
				if (openResourceFile(buf)) {
					return;
				}
				askForDisk(buf);

			} else {
				sprintf(buf, "%sdisk%.2d.lec", _gameDataPath,
								res.roomno[rtRoom][room]);
				_encbyte = 0x69;
			}
		} else {
			sprintf(buf, "%s%.2d.lfl", _gameDataPath, room);
			if (_features & GF_OLD_BUNDLE)
				_encbyte = 0xFF;
			else
				_encbyte = 0;
		}

		if (openResourceFile(buf)) {
			if (room == 0)
				return;
			if (_features & GF_EXTERNAL_CHARSET && room >= roomlimit)
				return;
			readRoomsOffsets();
			_fileOffset = _roomFileOffsets[room];

			if (_fileOffset != 8)
				return;

			error("Room %d not in %s", room, buf);
			return;
		}
		askForDisk(buf);
	}

	do {
		sprintf(buf, "%.3d.lfl", room);
		_encbyte = 0;
		if (openResourceFile(buf))
			break;
		askForDisk(buf);
	} while (1);

	deleteRoomOffsets();
	_fileOffset = 0;							/* start of file */
}

/* Delete the currently loaded room offsets */
void Scumm::deleteRoomOffsets()
{
	if (!(_features & GF_SMALL_HEADER) && !_dynamicRoomOffsets)
		return;

	for (int i = 0; i < _maxRooms; i++) {
		if (_roomFileOffsets[i] != 0xFFFFFFFF)
			_roomFileOffsets[i] = 0;
	}
}

/* Read room offsets */
void Scumm::readRoomsOffsets()
{
	int num, room;

	debug(9, "readRoomOffsets()");

	deleteRoomOffsets();
	if (_features & GF_SMALL_NAMES)
		return;

	if (!(_features & GF_SMALL_HEADER)) {
		if (!_dynamicRoomOffsets)
			return;

		fileSeek(_fileHandle, 16, SEEK_SET);
	} else {
		fileSeek(_fileHandle, 12, SEEK_SET);	// Directlry searching for the room offset block would be more generic...
	}

	num = fileReadByte();
	while (num) {
		num--;

		room = fileReadByte();
		if (_roomFileOffsets[room] != 0xFFFFFFFF) {
			_roomFileOffsets[room] = fileReadDwordLE();
		} else {
			fileReadDwordLE();
		}
	}
}

bool Scumm::openResourceFile(const char *filename)
{
	char buf[256];

	debug(9, "openResourceFile(%s)", filename);

	if (_resFilePath) {
#if defined(__APPLE__CW)
		sprintf(buf, ":%s.%d:%s", _resFilePath, _resFilePathId, filename);
#else
		sprintf(buf, "%s.%d\\%s", _resFilePath, _resFilePathId, filename);
#endif
	} else if (_resFilePrefix) {
		sprintf(buf, "%s%s", _resFilePrefix, filename);
	} else {
		strcpy(buf, filename);
	}

	if (_fileHandle != NULL) {
		fileClose(_fileHandle);
		_fileHandle = NULL;
	}

	_fileHandle = fileOpen(buf, 1);

	return _fileHandle != NULL;
}

void Scumm::askForDisk(const char *filename)
{
	error("Cannot find '%s'", filename);
}

void Scumm::readIndexFile()
{
	uint32 blocktype, itemsize;
	int numblock = 0;
	int num, i;

	debug(9, "readIndexFile()");

	openRoom(-1);
	openRoom(0);

	if (!(_features & GF_AFTER_V6)) {
		/* Figure out the sizes of various resources */
		while (!fileEof(_fileHandle)) {
			blocktype = fileReadDword();
			itemsize = fileReadDwordBE();
			if (fileReadFailed(_fileHandle))
				break;
			switch (blocktype) {
			case MKID('DOBJ'):
				_numGlobalObjects = fileReadWordLE();
				itemsize -= 2;
				break;
			case MKID('DROO'):
				_numRooms = fileReadWordLE();
				itemsize -= 2;
				break;

			case MKID('DSCR'):
				_numScripts = fileReadWordLE();
				itemsize -= 2;
				break;

			case MKID('DCOS'):
				_numCostumes = fileReadWordLE();
				itemsize -= 2;
				break;

			case MKID('DSOU'):
				_numSounds = fileReadWordLE();
				itemsize -= 2;
				break;
			}
			fileSeek(_fileHandle, itemsize - 8, SEEK_CUR);
		}
		clearFileReadFailed(_fileHandle);
		fileSeek(_fileHandle, 0, SEEK_SET);
	}

	while (1) {
		blocktype = fileReadDword();

		if (fileReadFailed(_fileHandle))
			break;
		itemsize = fileReadDwordBE();

		numblock++;

		switch (blocktype) {
		case MKID('DCHR'):
			readResTypeList(rtCharset, MKID('CHAR'), "charset");
			break;

		case MKID('DOBJ'):
			num = fileReadWordLE();
			assert(num == _numGlobalObjects);

			if (_features & GF_AFTER_V7) {
				fileRead(_fileHandle, _objectStateTable, num);
				fileRead(_fileHandle, _objectRoomTable, num);
				memset(_objectOwnerTable, 0xFF, num);

			} else {
				fileRead(_fileHandle, _objectOwnerTable, num);
				for (i = 0; i < num; i++) {
					_objectStateTable[i] = _objectOwnerTable[i] >> OF_STATE_SHL;
					_objectOwnerTable[i] &= OF_OWNER_MASK;
				}
			}
			fileRead(_fileHandle, _classData, num * sizeof(uint32));

			/* This code should be here. Otherwise the flags will be swapped for big endian computers.
			 * If it doesn't work with this code, something else is wrong */
#if defined(SCUMM_BIG_ENDIAN)
			for (i = 0; i != num; i++) {
				_classData[i] = FROM_LE_32(_classData[i]);
			}
#endif
			break;

		case MKID('RNAM'):
		case MKID('ANAM'):
			fileSeek(_fileHandle, itemsize - 8, SEEK_CUR);
			break;

		case MKID('DROO'):
			readResTypeList(rtRoom, MKID('ROOM'), "room");
			break;

		case MKID('DSCR'):
			readResTypeList(rtScript, MKID('SCRP'), "script");
			break;

		case MKID('DCOS'):
			readResTypeList(rtCostume, MKID('COST'), "costume");
			break;

		case MKID('MAXS'):
			readMAXS();
			break;

		case MKID('DSOU'):
			readResTypeList(rtSound, MKID('SOUN'), "sound");
			break;

		case MKID('AARY'):
			readArrayFromIndexFile();
			break;

		default:
			error("Bad ID %c%c%c%c found in directory!", blocktype & 0xFF,
						blocktype >> 8, blocktype >> 16, blocktype >> 24);
			return;
		}
	}

//  if (numblock!=9)
//    error("Not enough blocks read from directory");

	openRoom(-1);
}

void Scumm::readArrayFromIndexFile()
{
	int num;
	int a, b, c;

	while ((num = fileReadWordLE()) != 0) {
		a = fileReadWordLE();
		b = fileReadWordLE();
		c = fileReadWordLE();
		if (c == 1)
			defineArray(num, 1, a, b);
		else
			defineArray(num, 5, a, b);
	}
}

void Scumm::readResTypeList(int id, uint32 tag, const char *name)
{
	int num;
	int i;

	debug(9, "readResTypeList(%d,%x,%s)", id, FROM_LE_32(tag), name);

	num = fileReadWordLE();

	if (1 || _features & GF_AFTER_V6) {
		if (num != res.num[id]) {
			error("Invalid number of %ss (%d) in directory", name, num);
		}
	} else {
		if (num >= 0xFF) {
			error("Too many %ss (%d) in directory", name, num);
		}
		allocResTypeData(id, tag, num, name, 1);
	}

	if (_features & GF_SMALL_HEADER) {
		for (i = 0; i < num; i++) {
			res.roomno[id][i] = fileReadByte();
			res.roomoffs[id][i] = fileReadDword();
		}
	} else {
		fileRead(_fileHandle, res.roomno[id], num * sizeof(uint8));
		fileRead(_fileHandle, res.roomoffs[id], num * sizeof(uint32));
	}

#if defined(SCUMM_BIG_ENDIAN)
	for (i = 0; i < num; i++)
		res.roomoffs[id][i] = FROM_LE_32(res.roomoffs[id][i]);
#endif
}


void Scumm::allocResTypeData(int id, uint32 tag, int num, const char *name,
														 int mode)
{
	debug(9, "allocResTypeData(%d,%x,%d,%s,%d)", id, FROM_LE_32(tag), num, name,
				mode);
	assert(id >= 0 && id < (int)(sizeof(res.mode) / sizeof(res.mode[0])));

	if (num >= 2000) {
		error("Too many %ss (%d) in directory", name, num);
	}

	res.mode[id] = mode;
	res.num[id] = num;
	res.tags[id] = tag;
	res.name[id] = name;
	res.address[id] = (byte **)alloc(num * sizeof(void *));
	res.flags[id] = (byte *)alloc(num * sizeof(byte));

	if (mode) {
		res.roomno[id] = (byte *)alloc(num * sizeof(byte));
		res.roomoffs[id] = (uint32 *)alloc(num * sizeof(uint32));
	}
}

void Scumm::loadCharset(int no)
{
	int i;
	byte *ptr;

	debug(9, "loadCharset(%d)", no);



	memset(_charsetData, 0, sizeof(_charsetData));

	checkRange(_maxCharsets - 1, 1, no, "Loading illegal charset %d");

//  ensureResourceLoaded(6, no);
	ptr = getResourceAddress(6, no);

	for (i = 0; i < 15; i++) {
		_charsetData[no][i + 1] = ptr[i + 14];
	}
}

void Scumm::nukeCharset(int i)
{
	checkRange(_maxCharsets - 1, 1, i, "Nuking illegal charset %d");
	nukeResource(rtCharset, i);
}

void Scumm::ensureResourceLoaded(int type, int i)
{
	void *addr;

	debug(9, "ensureResourceLoaded(%d,%d)", type, i);

	if (type == rtRoom && i > 127) {
		i = _resourceMapper[i & 127];
	}

	if (i == 0)
		return;

	addr = res.address[type][i];
	if (addr)
		return;

	loadResource(type, i);

	if (!(_features & GF_AFTER_V7))
		if (type == rtRoom && i == _roomResource)
			_vars[VAR_ROOM_FLAG] = 1;
}

int Scumm::loadResource(int type, int idx)
{
	int roomNr, i;
	uint32 fileOffs;
	uint32 size, tag;

//  debug(1, "loadResource(%d,%d)", type,idx);

	if (type == rtCharset && (_features & GF_SMALL_HEADER)) {
		loadCharset(idx);
		return (1);
	}

	roomNr = getResourceRoomNr(type, idx);
	if (roomNr == 0 || idx >= res.num[type]) {
		error("%s %d undefined", res.name[type], idx);
	}

	if (type == rtRoom) {
		fileOffs = 0;
	} else {
		fileOffs = res.roomoffs[type][idx];
		if (fileOffs == 0xFFFFFFFF)
			return 0;
	}

	do {
		for (i = 0; i < 5; i++) {
			openRoom(roomNr);

			fileSeek(_fileHandle, fileOffs + _fileOffset, SEEK_SET);

			if (_features & GF_SMALL_HEADER) {
				if (!(_features & GF_SMALL_NAMES))
					fileSeek(_fileHandle, 8, SEEK_CUR);
				size = fileReadDwordLE();
				tag = fileReadWordLE();
				fileSeek(_fileHandle, -6, SEEK_CUR);
			} else {
				if (type == rtSound) {
					fileReadDwordLE();
					fileReadDwordLE();
					return readSoundResource(type, idx);
				}

				tag = fileReadDword();

				if (tag != res.tags[type]) {
					error("%s %d not in room %d at %d+%d",
								res.name[type], type, roomNr, _fileOffset, fileOffs);
				}

				size = fileReadDwordBE();
				fileSeek(_fileHandle, -8, SEEK_CUR);
			}
			fileRead(_fileHandle, createResource(type, idx, size), size);

			/* dump the resource */
#ifdef DUMP_SCRIPTS
			if (type == rtScript) {
				dumpResource("script-", idx, getResourceAddress(rtScript, idx));
			}
#endif

			if (!fileReadFailed(_fileHandle)) {
				return 1;
			}

			nukeResource(type, idx);
		}

		error("Cannot read resource");
	} while (1);
}

int Scumm::readSoundResource(int type, int idx)
{
	uint32 pos, total_size, size, tag, basetag;
	int pri, best_pri;
	uint32 best_size = 0, best_offs = 0;

	debug(9, "readSoundResource(%d,%d)", type, idx);

	pos = 0;

	basetag = fileReadDword();
	total_size = fileReadDwordBE();

	if (_gameId == GID_SAMNMAX || _features & GF_AFTER_V7) {
		if (basetag == MKID('MIDI')) {
			fileSeek(_fileHandle, -8, SEEK_CUR);
			fileRead(_fileHandle, createResource(type, idx, total_size + 8),
							 total_size + 8);
			return 1;
		}
	} else if (basetag == MKID('SOU ')) {
		best_pri = -1;
		while (pos < total_size) {
			tag = fileReadDword();
			size = fileReadDwordBE() + 8;
			pos += size;

			pri = -1;

			switch (tag) {
			case MKID('ADL '):
				if (_use_adlib)
					pri = 10;
				break;
			case MKID('ROL '):
				if (!_use_adlib)
					pri = 1;
				break;
			case MKID('GMD '):
				if (!_use_adlib)
					pri = 2;
				break;
			}

			if (pri > best_pri) {
				best_pri = pri;
				best_size = size;
				best_offs = filePos(_fileHandle);
			}

			fileSeek(_fileHandle, size - 8, SEEK_CUR);
		}

		if (best_pri != -1) {
			fileSeek(_fileHandle, best_offs - 8, SEEK_SET);
			fileRead(_fileHandle, createResource(type, idx, best_size), best_size);
			return 1;
		}
	} else if (FROM_LE_32(basetag) == 24) {
		fileSeek(_fileHandle, -12, SEEK_CUR);
		total_size = fileReadDwordBE();
		fileSeek(_fileHandle, -8, SEEK_CUR);
		fileRead(_fileHandle, createResource(type, idx, total_size), total_size);
		return 1;
	} else {
		error("Unrecognized base tag %c%c%c%c in sound %d",
					basetag & 0xff, basetag >> 8, basetag >> 16, basetag >> 24, idx);
	}
	res.roomoffs[type][idx] = 0xFFFFFFFF;
	return 0;
}

int Scumm::getResourceRoomNr(int type, int idx)
{
	if (type == rtRoom)
		return idx;
	return res.roomno[type][idx];
}

byte *Scumm::getResourceAddress(int type, int idx)
{
	byte *ptr;

	debug(9, "getResourceAddress(%d,%d)", type, idx);

	CHECK_HEAP validateResource("getResourceAddress", type, idx);
	if (!res.address[type])
		return NULL;

	if (res.mode[type] && !res.address[type][idx]) {
		ensureResourceLoaded(type, idx);
	}


	if (!(ptr = (byte *)res.address[type][idx]))
		return NULL;

	setResourceCounter(type, idx, 1);

	return ptr + sizeof(MemBlkHeader);
}

byte *Scumm::getStringAddress(int i)
{
	byte *b = getResourceAddress(rtString, i);
	if (!b)
		return b;

	if (_features & GF_NEW_OPCODES)
		return ((ArrayHeader *)b)->data;
	return b;
}

void Scumm::setResourceCounter(int type, int idx, byte flag)
{
	res.flags[type][idx] &= ~RF_USAGE;
	res.flags[type][idx] |= flag;
}

/* 2 bytes safety area to make "precaching" of bytes in the gdi drawer easier */
#define SAFETY_AREA 2

byte *Scumm::createResource(int type, int idx, uint32 size)
{
	byte *ptr;

	CHECK_HEAP debug(9, "createResource(%d,%d,%d)", type, idx, size);

	if (size > 65536 * 4 + 37856)
		warning("Probably invalid size allocating %d", size);

	validateResource("allocating", type, idx);
	nukeResource(type, idx);

	expireResources(size);

	CHECK_HEAP ptr = (byte *)alloc(size + sizeof(MemBlkHeader) + SAFETY_AREA);
	if (ptr == NULL) {
		error("Out of memory while allocating %d", size);
	}

	_allocatedSize += size;

	res.address[type][idx] = ptr;
	((MemBlkHeader *)ptr)->size = size;
	setResourceCounter(type, idx, 1);
	return ptr + sizeof(MemBlkHeader);	/* skip header */
}

void Scumm::validateResource(const char *str, int type, int idx)
{
	if (type < rtFirst || type > rtLast || (uint) idx >= (uint) res.num[type]) {
		warning("%s Illegal Glob type %d num %d", str, type, idx);
	}
}

void Scumm::nukeResource(int type, int idx)
{
	byte *ptr;

	debug(9, "nukeResource(%d,%d)", type, idx);

	CHECK_HEAP if (!res.address[type])
		return;

	assert(idx >= 0 && idx < res.num[type]);

	if ((ptr = res.address[type][idx]) != NULL) {
		res.address[type][idx] = 0;
		res.flags[type][idx] = 0;
		_allocatedSize -= ((MemBlkHeader *)ptr)->size;
		free(ptr);
	}
}

byte *Scumm::findResourceData(uint32 tag, byte *ptr)
{
	if (_features & GF_SMALL_HEADER) {
		ptr = findResourceSmall(tag, ptr, 0);
		if (ptr == NULL)
			return NULL;
		return ptr + 6;
	}

	ptr = findResource(tag, ptr, 0);
	if (ptr == NULL)
		return NULL;
	return ptr + 8;
}

int Scumm::getResourceDataSize(byte *ptr)
{
	if (ptr == NULL)
		return 0;

	if (_features & GF_SMALL_HEADER)
		return READ_LE_UINT32(ptr) - 6;
	else
		return READ_BE_UINT32(ptr - 4) - 8;
}

struct FindResourceState {
	uint32 size, pos;
	byte *ptr;
};

/* just O(N) complexity when iterating with this function */
byte *findResource(uint32 tag, byte *searchin)
{
	uint32 size;
	static FindResourceState frs;
	FindResourceState *f = &frs;	/* easier to make it thread safe like this */

	if (searchin) {
		f->size = READ_BE_UINT32_UNALIGNED(searchin + 4);
		f->pos = 8;
		f->ptr = searchin + 8;
		goto StartScan;
	}

	do {
		size = READ_BE_UINT32_UNALIGNED(f->ptr + 4);
		if ((int32) size <= 0)
			return NULL;

		f->pos += size;
		f->ptr += size;

	StartScan:
		if (f->pos >= f->size)
			return NULL;
	} while (READ_UINT32_UNALIGNED(f->ptr) != tag);

	return f->ptr;
}

byte *findResourceSmall(uint32 tag, byte *searchin)
{
	uint32 size;
	static FindResourceState frs;
	FindResourceState *f = &frs;	/* easier to make it thread safe like this */
	uint16 smallTag;

	smallTag = newTag2Old(tag);

	if (searchin) {
		f->size = READ_LE_UINT32(searchin);
		f->pos = 6;
		f->ptr = searchin + 6;
		goto StartScan;
	}

	do {
		size = READ_LE_UINT32(f->ptr);
		if ((int32) size <= 0)
			return NULL;

		f->pos += size;
		f->ptr += size;

	StartScan:
		if (f->pos >= f->size)
			return NULL;
	} while (READ_LE_UINT16(f->ptr + 4) != smallTag);

	return f->ptr;
}

byte *findResource(uint32 tag, byte *searchin, int idx)
{
	uint32 curpos, totalsize, size;

	assert(searchin);

	searchin += 4;
	totalsize = READ_BE_UINT32_UNALIGNED(searchin);
	curpos = 8;
	searchin += 4;

	while (curpos < totalsize) {
		if (READ_UINT32_UNALIGNED(searchin) == tag && !idx--)
			return searchin;

		size = READ_BE_UINT32_UNALIGNED(searchin + 4);
		if ((int32) size <= 0) {
			error("(%c%c%c%c) Not found in %d... illegal block len %d",
						tag & 0xFF, (tag >> 8) & 0xFF, (tag >> 16) & 0xFF,
						(tag >> 24) & 0xFF, 0, size);
			return NULL;
		}

		curpos += size;
		searchin += size;
	}

	return NULL;
}

byte *findResourceSmall(uint32 tag, byte *searchin, int idx)
{
	uint32 curpos, totalsize, size;
	uint16 smallTag;

	smallTag = newTag2Old(tag);

	assert(searchin);

	totalsize = READ_LE_UINT32(searchin);
	searchin += 6;
	curpos = 6;

	while (curpos < totalsize) {
		size = READ_LE_UINT32(searchin);

		if (READ_LE_UINT16(searchin + 4) == smallTag && !idx--)
			return searchin;

		if ((int32) size <= 0) {
			error("(%c%c%c%c) Not found in %d... illegal block len %d",
						tag & 0xFF, (tag >> 8) & 0xFF, (tag >> 16) & 0xFF,
						(tag >> 24) & 0xFF, 0, size);
			return NULL;
		}

		curpos += size;
		searchin += size;
	}

	return NULL;
}

void Scumm::lock(int type, int i)
{
	validateResource("Locking", type, i);
	res.flags[type][i] |= RF_LOCK;

//  debug(1, "locking %d,%d", type, i);
}

void Scumm::unlock(int type, int i)
{
	validateResource("Unlocking", type, i);
	res.flags[type][i] &= ~RF_LOCK;

//  debug(1, "unlocking %d,%d", type, i);
}

bool Scumm::isResourceInUse(int type, int i)
{
	validateResource("isResourceInUse", type, i);
	switch (type) {
	case rtRoom:
		return _roomResource == (byte)i;
	case rtScript:
		return isScriptInUse(i);
	case rtCostume:
		return isCostumeInUse(i);
	case rtSound:
		return isSoundRunning(i) != 0;
	default:
		return false;
	}
}

void Scumm::increaseResourceCounter()
{
	int i, j;
	byte counter;

	for (i = rtFirst; i <= rtLast; i++) {
		for (j = res.num[i]; --j >= 0;) {
			counter = res.flags[i][j] & RF_USAGE;
			if (counter && counter < RF_USAGE_MAX) {
				setResourceCounter(i, j, counter + 1);
			}
		}
	}
}

void Scumm::expireResources(uint32 size)
{
	int i, j;
	byte flag;
	byte best_counter;
	int best_type, best_res = 0;
	uint32 oldAllocatedSize;

//	return;

	if (_expire_counter != 0xFF) {
		_expire_counter = 0xFF;
		increaseResourceCounter();
	}

	if (size + _allocatedSize < _maxHeapThreshold)
		return;

	oldAllocatedSize = _allocatedSize;

	do {
		best_type = 0;
		best_counter = 2;

		for (i = rtFirst; i <= rtLast; i++)
			if (res.mode[i]) {
				for (j = res.num[i]; --j >= 0;) {
					flag = res.flags[i][j];
					if (!(flag & 0x80) && flag >= best_counter
							&& res.address[i][j] && !isResourceInUse(i, j)) {
						best_counter = flag;
						best_type = i;
						best_res = j;
					}
				}
			}

		if (!best_type)
			break;
		nukeResource(best_type, best_res);
	} while (size + _allocatedSize > _minHeapThreshold);

	increaseResourceCounter();

	debug(1, "Expired resources, mem %d -> %d", oldAllocatedSize,
				_allocatedSize);
}

void Scumm::freeResources()
{
	int i, j;
	for (i = rtFirst; i <= rtLast; i++) {
		for (j = res.num[i]; --j >= 0;) {
			if (isResourceLoaded(i, j))
				nukeResource(i, j);
		}
		free(res.address[i]);
		free(res.flags[i]);
		free(res.roomno[i]);
		free(res.roomoffs[i]);
	}
}

void Scumm::loadPtrToResource(int type, int resindex, byte *source)
{
	byte *alloced;
	int i, len;

	nukeResource(type, resindex);

	len = getStringLen(source);

	if (len <= 0)
		return;

	alloced = createResource(type, resindex, len);

	if (!source) {
		alloced[0] = fetchScriptByte();
		for (i = 1; i < len; i++)
			alloced[i] = *_scriptPointer++;
	} else {
		for (i = 0; i < len; i++)
			alloced[i] = source[i];
	}
}

bool Scumm::isResourceLoaded(int type, int idx)
{
	validateResource("isLoaded", type, idx);
	return res.address[type][idx] != NULL;
}

void Scumm::resourceStats()
{
	int i, j;
	uint32 lockedSize = 0, lockedNum = 0;
	byte flag;

	for (i = rtFirst; i <= rtLast; i++)
		for (j = res.num[i]; --j >= 0;) {
			flag = res.flags[i][j];
			if (flag & 0x80 && res.address[i][j]) {
				lockedSize += ((MemBlkHeader *)res.address[i][j])->size;
				lockedNum++;
			}
		}

	printf("Total allocated size=%ld, locked=%ld(%ld)\n", _allocatedSize,
				 lockedSize, lockedNum);
}

void Scumm::heapClear(int mode)
{
}

void Scumm::unkHeapProc2(int a, int b)
{
}

void Scumm::readMAXS()
{
	if (_features & GF_AFTER_V7) {
		fileSeek(_fileHandle, 50 + 50, SEEK_CUR);
		_numVariables = fileReadWordLE();
		_numBitVariables = fileReadWordLE();
		fileReadWordLE();
		_numGlobalObjects = fileReadWordLE();
		_numLocalObjects = fileReadWordLE();
		_numNewNames = fileReadWordLE();
		_numVerbs = fileReadWordLE();
		_numFlObject = fileReadWordLE();
		_numInventory = fileReadWordLE();
		_numArray = fileReadWordLE();
		_numRooms = fileReadWordLE();
		_numScripts = fileReadWordLE();
		_numSounds = fileReadWordLE();
		_numCharsets = fileReadWordLE();
		_numCostumes = fileReadWordLE();

		_objectRoomTable = (byte *)alloc(_numGlobalObjects);
		_numGlobalScripts = 2000;

		_shadowPaletteSize = NUM_SHADOW_PALETTE * 256;
	} else if (_features & GF_AFTER_V6) {
		_numVariables = fileReadWordLE();
		fileReadWordLE();
		_numBitVariables = fileReadWordLE();
		_numLocalObjects = fileReadWordLE();
		_numArray = fileReadWordLE();
		fileReadWordLE();
		_numVerbs = fileReadWordLE();
		_numFlObject = fileReadWordLE();
		_numInventory = fileReadWordLE();
		_numRooms = fileReadWordLE();
		_numScripts = fileReadWordLE();
		_numSounds = fileReadWordLE();
		_numCharsets = fileReadWordLE();
		_numCostumes = fileReadWordLE();
		_numGlobalObjects = fileReadWordLE();
		_numNewNames = 50;

		_objectRoomTable = NULL;
		_numGlobalScripts = 200;

		_shadowPaletteSize = 256;
	} else {
		_numVariables = fileReadWordLE();	/* 800 */
		fileReadWordLE();						/* 16 */
		_numBitVariables = fileReadWordLE();	/* 2048 */
		_numLocalObjects = fileReadWordLE();	/* 200 */
		_numArray = 50;
		_numVerbs = 100;
		_numNewNames = 0;
		_objectRoomTable = NULL;

		fileReadWordLE();						/* 50 */
		_numCharsets = fileReadWordLE();	/* 9 */
		fileReadWordLE();						/* 100 */
		fileReadWordLE();						/* 50 */
		_numInventory = fileReadWordLE();	/* 80 */
		_numGlobalScripts = 200;

		_shadowPaletteSize = 256;

		_numFlObject = 50;
	}

	if (_shadowPaletteSize)
		_shadowPalette = (byte *)alloc(_shadowPaletteSize);

	allocateArrays();
	_dynamicRoomOffsets = 1;
}

void Scumm::allocateArrays()
{
	// Note: Buffers are now allocated in scummMain to allow for
	//     early GUI init.

	_objectOwnerTable = (byte *)alloc(_numGlobalObjects);
	_objectStateTable = (byte *)alloc(_numGlobalObjects);
	_classData = (uint32 *)alloc(_numGlobalObjects * sizeof(uint32));
	_arrays = (byte *)alloc(_numArray);
	_newNames = (uint16 *)alloc(_numNewNames * sizeof(uint16));

	_inventory = (uint16 *)alloc(_numInventory * sizeof(uint16));
	_verbs = (VerbSlot *)alloc(_numVerbs * sizeof(VerbSlot));
	_objs = (ObjectData *)alloc(_numLocalObjects * sizeof(ObjectData));
	_vars = (int16 *) alloc(_numVariables * sizeof(int16));
	_bitVars = (byte *)alloc(_numBitVariables >> 3);

	allocResTypeData(rtCostume,
									 (_features & GF_NEW_COSTUMES) ? MKID('AKOS') :
									 MKID('COST'), _numCostumes, "costume", 1);

	allocResTypeData(rtRoom, MKID('ROOM'), _numRooms, "room", 1);
	allocResTypeData(rtSound, MKID('SOUN'), _numSounds, "sound", 1);
	allocResTypeData(rtScript, MKID('SCRP'), _numScripts, "script", 1);
	allocResTypeData(rtCharset, MKID('CHAR'), _numCharsets, "charset", 1);
	allocResTypeData(rtObjectName, MKID('NONE'), _numNewNames, "new name", 0);
	allocResTypeData(rtInventory, MKID('NONE'), _numInventory, "inventory", 0);
	allocResTypeData(rtTemp, MKID('NONE'), 10, "temp", 0);
	allocResTypeData(rtScaleTable, MKID('NONE'), 5, "scale table", 0);
	allocResTypeData(rtActorName, MKID('NONE'), NUM_ACTORS, "actor name", 0);
	allocResTypeData(rtVerb, MKID('NONE'), _numVerbs, "verb", 0);
	allocResTypeData(rtString, MKID('NONE'), _numArray, "array", 0);
	allocResTypeData(rtFlObject, MKID('NONE'), _numFlObject, "flobject", 0);
	allocResTypeData(rtMatrix, MKID('NONE'), 10, "boxes", 0);
}

uint16 newTag2Old(uint32 oldTag)
{
	switch (oldTag) {
	case (MKID('RMHD')):
		return (0x4448);
		break;
	case (MKID('IM00')):
		return (0x4D42);
		break;
	case (MKID('EXCD')):
		return (0x5845);
		break;
	case (MKID('ENCD')):
		return (0x4E45);
		break;
	case (MKID('SCAL')):
		return (0x4153);
		break;
	case (MKID('LSCR')):
		return (0x534C);
		break;
	case (MKID('OBCD')):
		return (0x434F);
		break;
	case (MKID('OBIM')):
		return (0x494F);
		break;
	case (MKID('SMAP')):
		return (0x4D42);
		break;
	case (MKID('CLUT')):
		return (0x4150);
		break;
	case (MKID('BOXD')):
		return (0x5842);
		break;
	default:
		return (0);
	}
}