Initial commit

engines/wintermute/base/scriptables/script_ext_file.cpp

@@ -0,0 +1,826 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 3 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/>.
+ *
+ */
+
+/*
+ * This file is based on WME Lite.
+ * http://dead-code.org/redir.php?target=wmelite
+ * Copyright (c) 2011 Jan Nedoma
+ */
+
+#include "engines/wintermute/system/sys_class_registry.h"
+#include "engines/wintermute/system/sys_class.h"
+#include "engines/wintermute/base/scriptables/script_stack.h"
+#include "engines/wintermute/base/scriptables/script_value.h"
+#include "engines/wintermute/base/scriptables/script.h"
+#include "engines/wintermute/utils/utils.h"
+#include "engines/wintermute/base/base_game.h"
+#include "engines/wintermute/base/base_engine.h"
+#include "engines/wintermute/base/base_file_manager.h"
+#include "engines/wintermute/base/file/base_savefile_manager_file.h"
+#include "engines/wintermute/platform_osystem.h"
+#include "engines/wintermute/base/scriptables/script_ext_file.h"
+#include "engines/wintermute/dcgf.h"
+
+// Note: This code is completely untested, as I have yet to find a game that uses SXFile.
+
+namespace Wintermute {
+
+IMPLEMENT_PERSISTENT(SXFile, false)
+
+BaseScriptable *makeSXFile(BaseGame *inGame, ScStack *stack) {
+	return new SXFile(inGame, stack);
+}
+
+//////////////////////////////////////////////////////////////////////////
+SXFile::SXFile(BaseGame *inGame, ScStack *stack) : BaseScriptable(inGame) {
+	stack->correctParams(1);
+	ScValue *val = stack->pop();
+
+	_filename = nullptr;
+	if (!val->isNULL()) {
+		BaseUtils::setString(&_filename, val->getString());
+	}
+
+	_readFile = nullptr;
+	_writeFile = nullptr;
+
+	_mode = 0;
+	_textMode = false;
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+SXFile::~SXFile() {
+	cleanup();
+}
+
+//////////////////////////////////////////////////////////////////////////
+void SXFile::cleanup() {
+	SAFE_DELETE_ARRAY(_filename);
+	close();
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+void SXFile::close() {
+	if (_readFile) {
+		_game->_fileManager->closeFile(_readFile);
+		_readFile = nullptr;
+	}
+	if (_writeFile) {
+		_writeFile->finalize();
+		SAFE_DELETE(_writeFile);
+	}
+	_mode = 0;
+	_textMode = false;
+}
+
+//////////////////////////////////////////////////////////////////////////
+const char *SXFile::scToString() {
+	if (_filename && _filename[0]) {
+		return _filename;
+	} else {
+		return "[file object]";
+	}
+}
+
+#define FILE_BUFFER_SIZE 32768
+//////////////////////////////////////////////////////////////////////////
+bool SXFile::scCallMethod(ScScript *script, ScStack *stack, ScStack *thisStack, const char *name) {
+	//////////////////////////////////////////////////////////////////////////
+	// SetFilename
+	//////////////////////////////////////////////////////////////////////////
+	if (strcmp(name, "SetFilename") == 0) {
+		stack->correctParams(1);
+		const char *filename = stack->pop()->getString();
+		cleanup();
+		BaseUtils::setString(&_filename, filename);
+		stack->pushNULL();
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// OpenAsText / OpenAsBinary
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "OpenAsText") == 0 || strcmp(name, "OpenAsBinary") == 0) {
+		stack->correctParams(1);
+		close();
+		_mode = stack->pop()->getInt(1);
+		if (_mode < 1 || _mode > 3) {
+			script->runtimeError("File.%s: invalid access mode. Setting read mode.", name);
+			_mode = 1;
+		}
+		if (_mode == 1) {
+			_readFile = _game->_fileManager->openFile(_filename);
+			if (!_readFile) {
+				//script->runtimeError("File.%s: Error opening file '%s' for reading.", name, _filename);
+				close();
+			} else {
+				_textMode = strcmp(name, "OpenAsText") == 0;
+			}
+		} else {
+			if (strcmp(name, "OpenAsText") == 0) {
+				if (_mode == 2) {
+					_writeFile = openForWrite(_filename, false);
+				} else {
+					_writeFile = openForAppend(_filename, false);
+				}
+			} else {
+				if (_mode == 2) {
+					_writeFile = openForWrite(_filename, true);
+				} else {
+					_writeFile = openForAppend(_filename, true);
+				}
+			}
+
+			if (!_writeFile) {
+				//script->runtimeError("File.%s: Error opening file '%s' for writing.", name, _filename);
+				close();
+			} else {
+				_textMode = strcmp(name, "OpenAsText") == 0;
+			}
+		}
+
+		if (_readFile || _writeFile) {
+			stack->pushBool(true);
+		} else {
+			stack->pushBool(false);
+		}
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// Close
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "Close") == 0) {
+		stack->correctParams(0);
+		close();
+		stack->pushNULL();
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// SetPosition
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "SetPosition") == 0) {
+		stack->correctParams(1);
+		if (_mode == 0) {
+			script->runtimeError("File.%s: File is not open", name);
+			stack->pushBool(false);
+		} else {
+			int pos = stack->pop()->getInt();
+			stack->pushBool(setPos(pos));
+		}
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// Delete
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "Delete") == 0) {
+		stack->correctParams(0);
+		close();
+		stack->pushBool(sfmFileRemove(_filename));
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// Copy
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "Copy") == 0) {
+		stack->correctParams(2);
+		/* const char *dest = */ stack->pop()->getString();
+		/* bool overwrite = */ stack->pop()->getBool(true);
+
+		// Known game that need this:
+		// * Space Madness (to copy bonus wallpapers from data.dcp to /saves/ folder)
+		// * games by Rootfix intertainment (to save temporary screenshot as savegame screenshot)
+		warning("SXFile-Method: Copy not supported");
+
+		stack->pushBool(false);
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// ReadLine
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "ReadLine") == 0) {
+		stack->correctParams(0);
+		if (!_textMode || !_readFile) {
+			script->runtimeError("File.%s: File must be open in text mode.", name);
+			stack->pushNULL();
+			return STATUS_OK;
+		}
+		uint32 bufSize = FILE_BUFFER_SIZE;
+		byte *buf = (byte *)malloc(bufSize);
+		uint32 counter = 0;
+		byte b;
+		bool foundNewLine = false;
+		bool ret = STATUS_FAILED;
+		do {
+			ret = _readFile->read(&b, 1);
+			if (ret != 1) {
+				break;
+			}
+
+			if (counter > bufSize) {
+				buf = (byte *)realloc(buf, bufSize + FILE_BUFFER_SIZE);
+				bufSize += FILE_BUFFER_SIZE;
+			}
+			if (b == '\n') {
+				buf[counter] = '\0';
+				foundNewLine = true;
+				break;
+			} else if (b == 0x0D) {
+				continue;
+			} else {
+				buf[counter] = b;
+				counter++;
+			}
+		} while (DID_SUCCEED(ret));
+
+		if (counter > bufSize) {
+			buf = (byte *)realloc(buf, bufSize + FILE_BUFFER_SIZE);
+			bufSize += FILE_BUFFER_SIZE;
+		}
+		buf[counter] = '\0';
+
+		if (!foundNewLine && counter == 0) {
+			stack->pushNULL();
+		} else {
+			stack->pushString((char *)buf);
+		}
+
+		free(buf);
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// ReadText
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "ReadText") == 0) {
+		stack->correctParams(1);
+		int textLen = stack->pop()->getInt();
+
+		if (!_textMode || !_readFile) {
+			script->runtimeError("File.%s: File must be open in text mode.", name);
+			stack->pushNULL();
+			return STATUS_OK;
+		}
+		uint32 bufSize = FILE_BUFFER_SIZE;
+		byte *buf = (byte *)malloc(bufSize);
+		uint32 counter = 0;
+		byte b;
+
+		bool ret = STATUS_FAILED;
+		while (counter < (uint32)textLen) {
+			ret = _readFile->read(&b, 1);
+			if (ret != 1) {
+				break;
+			}
+
+			if (counter > bufSize) {
+				buf = (byte *)realloc(buf, bufSize + FILE_BUFFER_SIZE);
+				bufSize += FILE_BUFFER_SIZE;
+			}
+			if (b == 0x0D) {
+				continue;
+			} else {
+				buf[counter] = b;
+				counter++;
+			}
+		}
+
+		if (counter > bufSize) {
+			buf = (byte *)realloc(buf, bufSize + FILE_BUFFER_SIZE);
+			bufSize += FILE_BUFFER_SIZE;
+		}
+		buf[counter] = '\0';
+
+		if (textLen > 0 && counter == 0) {
+			stack->pushNULL();
+		} else {
+			stack->pushString((char *)buf);
+		}
+
+		free(buf);
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// WriteLine / WriteText
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "WriteLine") == 0 || strcmp(name, "WriteText") == 0) {
+		stack->correctParams(1);
+		const char *line = stack->pop()->getString();
+		if (!_textMode || !_writeFile) {
+			script->runtimeError("File.%s: File must be open for writing in text mode.", name);
+			stack->pushBool(false);
+			return STATUS_OK;
+		}
+		Common::String writeLine;
+		if (strcmp(name, "WriteLine") == 0) {
+			writeLine = Common::String::format("%s\n", line);
+		} else {
+			writeLine = Common::String::format("%s", line);
+		}
+		_writeFile->writeString(writeLine);
+		stack->pushBool(true);
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	//////////////////////////////////////////////////////////////////////////
+	// ReadBool
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "ReadBool") == 0) {
+		stack->correctParams(0);
+		if (_textMode || !_readFile) {
+			script->runtimeError("File.%s: File must be open for reading in binary mode.", name);
+			stack->pushNULL();
+			return STATUS_OK;
+		}
+		byte val;
+		if (_readFile->read(&val, sizeof(byte))) {
+			stack->pushBool(val != 0);
+		} else {
+			stack->pushNULL();
+		}
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// ReadByte
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "ReadByte") == 0) {
+		stack->correctParams(0);
+		if (_textMode || !_readFile) {
+			script->runtimeError("File.%s: File must be open for reading in binary mode.", name);
+			stack->pushNULL();
+			return STATUS_OK;
+		}
+		byte val = _readFile->readByte();
+		if (!_readFile->err()) {
+			stack->pushInt(val);
+		} else {
+			stack->pushNULL();
+		}
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// ReadShort
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "ReadShort") == 0) {
+		stack->correctParams(0);
+		if (_textMode || !_readFile) {
+			script->runtimeError("File.%s: File must be open for reading in binary mode.", name);
+			stack->pushNULL();
+			return STATUS_OK;
+		}
+		int16 val = _readFile->readSint16LE();
+		if (!_readFile->err()) {
+			stack->pushInt(65536 + val);
+		} else {
+			stack->pushNULL();
+		}
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// ReadInt / ReadLong
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "ReadInt") == 0 || strcmp(name, "ReadLong") == 0) {
+		stack->correctParams(0);
+		if (_textMode || !_readFile) {
+			script->runtimeError("File.%s: File must be open for reading in binary mode.", name);
+			stack->pushNULL();
+			return STATUS_OK;
+		}
+		int32 val = _readFile->readSint32LE();
+		if (!_readFile->err()) {
+			stack->pushInt(val);
+		} else {
+			stack->pushNULL();
+		}
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// ReadFloat
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "ReadFloat") == 0) {
+		stack->correctParams(0);
+		if (_textMode || !_readFile) {
+			script->runtimeError("File.%s: File must be open for reading in binary mode.", name);
+			stack->pushNULL();
+			return STATUS_OK;
+		}
+		float val = _readFile->readFloatLE();
+		if (!_readFile->err()) {
+			stack->pushFloat(val);
+		} else {
+			stack->pushNULL();
+		}
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// ReadDouble
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "ReadDouble") == 0) {
+		stack->correctParams(0);
+		if (_textMode || !_readFile) {
+			script->runtimeError("File.%s: File must be open for reading in binary mode.", name);
+			stack->pushNULL();
+			return STATUS_OK;
+		}
+		double val = _readFile->readDoubleLE();
+		if (!_readFile->err()) {
+			stack->pushFloat(val);
+		} else {
+			stack->pushNULL();
+		}
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// ReadString
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "ReadString") == 0) {
+		stack->correctParams(0);
+		if (_textMode || !_readFile) {
+			script->runtimeError("File.%s: File must be open for reading in binary mode.", name);
+			stack->pushNULL();
+			return STATUS_OK;
+		}
+		uint32 size = _readFile->readUint32LE();
+		if (!_readFile->err()) {
+			byte *str = new byte[size + 1];
+			if (str) {
+				if (_readFile->read(str, size) == size) {
+					str[size] = '\0';
+					stack->pushString((char *)str);
+				}
+				delete[] str;
+			} else {
+				stack->pushNULL();
+			}
+		} else {
+			stack->pushNULL();
+		}
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// WriteBool
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "WriteBool") == 0) {
+		stack->correctParams(1);
+		bool val = stack->pop()->getBool();
+
+		if (_textMode || !_writeFile) {
+			script->runtimeError("File.%s: File must be open for writing in binary mode.", name);
+			stack->pushBool(false);
+			return STATUS_OK;
+		}
+		_writeFile->writeByte(val);
+		stack->pushBool(true);
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// WriteByte
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "WriteByte") == 0) {
+		stack->correctParams(1);
+		byte val = stack->pop()->getInt();
+
+		if (_textMode || !_writeFile) {
+			script->runtimeError("File.%s: File must be open for writing in binary mode.", name);
+			stack->pushBool(false);
+			return STATUS_OK;
+		}
+		_writeFile->writeByte(val);
+		stack->pushBool(true);
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// WriteShort
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "WriteShort") == 0) {
+		stack->correctParams(1);
+		int16 val = stack->pop()->getInt();
+
+		if (_textMode || !_writeFile) {
+			script->runtimeError("File.%s: File must be open for writing in binary mode.", name);
+			stack->pushBool(false);
+			return STATUS_OK;
+		}
+		_writeFile->writeSint16LE(val);
+		stack->pushBool(true);
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// WriteInt / WriteLong
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "WriteInt") == 0 || strcmp(name, "WriteLong") == 0) {
+		stack->correctParams(1);
+		int32 val = stack->pop()->getInt();
+
+		if (_textMode || !_writeFile) {
+			script->runtimeError("File.%s: File must be open for writing in binary mode.", name);
+			stack->pushBool(false);
+			return STATUS_OK;
+		}
+		_writeFile->writeSint32LE(val);
+		stack->pushBool(true);
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// WriteFloat
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "WriteFloat") == 0) {
+		stack->correctParams(1);
+		float val = stack->pop()->getFloat();
+
+		if (_textMode || !_writeFile) {
+			script->runtimeError("File.%s: File must be open for writing in binary mode.", name);
+			stack->pushBool(false);
+			return STATUS_OK;
+		}
+		uint32 *ptr = (uint32 *)&val;
+		_writeFile->writeUint32LE(*ptr);
+		stack->pushBool(true);
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// WriteDouble
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "WriteDouble") == 0) {
+		stack->correctParams(1);
+		double val = stack->pop()->getFloat();
+
+		if (_textMode || !_writeFile) {
+			script->runtimeError("File.%s: File must be open for writing in binary mode.", name);
+			stack->pushBool(false);
+			return STATUS_OK;
+		}
+		_writeFile->writeDoubleLE(val);
+		stack->pushBool(true);
+
+		return STATUS_OK;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// WriteString
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "WriteString") == 0) {
+		stack->correctParams(1);
+		const char *val = stack->pop()->getString();
+
+		if (_textMode || !_writeFile) {
+			script->runtimeError("File.%s: File must be open for writing in binary mode.", name);
+			stack->pushBool(false);
+			return STATUS_OK;
+		}
+
+		uint32 size = strlen(val);
+		_writeFile->writeUint32LE(size);
+		_writeFile->writeString(val);
+
+		stack->pushBool(true);
+
+		return STATUS_OK;
+	} else {
+		return BaseScriptable::scCallMethod(script, stack, thisStack, name);
+	}
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+ScValue *SXFile::scGetProperty(const char *name) {
+	_scValue->setNULL();
+
+	//////////////////////////////////////////////////////////////////////////
+	// Type (RO)
+	//////////////////////////////////////////////////////////////////////////
+	if (strcmp(name, "Type") == 0) {
+		_scValue->setString("file");
+		return _scValue;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// Filename (RO)
+	//////////////////////////////////////////////////////////////////////////
+	if (strcmp(name, "Filename") == 0) {
+		_scValue->setString(_filename);
+		return _scValue;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// Position (RO)
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "Position") == 0) {
+		_scValue->setInt(getPos());
+		return _scValue;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// Length (RO)
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "Length") == 0) {
+		_scValue->setInt(getLength());
+		return _scValue;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// TextMode (RO)
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "TextMode") == 0) {
+		_scValue->setBool(_textMode);
+		return _scValue;
+	}
+
+	//////////////////////////////////////////////////////////////////////////
+	// AccessMode (RO)
+	//////////////////////////////////////////////////////////////////////////
+	else if (strcmp(name, "AccessMode") == 0) {
+		_scValue->setInt(_mode);
+		return _scValue;
+	} else {
+		return BaseScriptable::scGetProperty(name);
+	}
+}
+
+
+//////////////////////////////////////////////////////////////////////////
+bool SXFile::scSetProperty(const char *name, ScValue *value) {
+	/*
+	//////////////////////////////////////////////////////////////////////////
+	// Length
+	//////////////////////////////////////////////////////////////////////////
+	if (strcmp(name, "Length")==0) {
+	    int origLength = _length;
+	    _length = MAX(value->getInt(0), 0);
+
+	    char propName[20];
+	    if (_length < OrigLength) {
+	        for(int i=_length; i<OrigLength; i++) {
+	            Common::sprintf_s(PropName, "%d", i);
+	            _values->DeleteProp(PropName);
+	        }
+	    }
+	    return STATUS_OK;
+	}
+	else*/ return BaseScriptable::scSetProperty(name, value);
+}
+
+//////////////////////////////////////////////////////////////////////////
+uint32 SXFile::getPos() {
+	if (_mode == 1 && _readFile) {
+		return _readFile->pos();
+	} else if ((_mode == 2 || _mode == 3) && _writeFile) {
+		error("SXFile - getPos for WriteFile not supported");
+		return 0;
+//		return ftell((FILE *)_writeFile);
+	} else {
+		return 0;
+	}
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool SXFile::setPos(uint32 pos, int whence) {
+	if (_mode == 1 && _readFile) {
+		return _readFile->seek(pos, whence);
+	} else if ((_mode == 2 || _mode == 3) && _writeFile) {
+		if (BaseEngine::instance().getGameId() != "royalmahjong") {
+			error("SXFile - seeking in WriteFile not supported");
+		}
+		return false;
+//		return fseek((FILE *)_writeFile, pos, (int)origin) == 0;
+	} else {
+		return false;
+	}
+}
+
+//////////////////////////////////////////////////////////////////////////
+uint32 SXFile::getLength() {
+	if (_mode == 1 && _readFile) {
+		return _readFile->size();
+	} else if ((_mode == 2 || _mode == 3) && _writeFile) {
+		error("SXFile - reading length for WriteFile not supported");
+		return 0;
+/*
+		uint32 currentPos = ftell((FILE *)_writeFile);
+		fseek((FILE *)_writeFile, 0, SEEK_END);
+		int ret = ftell((FILE *)_writeFile);
+		fseek((FILE *)_writeFile, CurrentPos, SEEK_SET);
+		return Ret;*/
+	} else {
+		return 0;
+	}
+}
+
+//////////////////////////////////////////////////////////////////////////
+bool SXFile::persist(BasePersistenceManager *persistMgr) {
+
+	BaseScriptable::persist(persistMgr);
+
+	persistMgr->transferCharPtr(TMEMBER(_filename));
+	persistMgr->transferSint32(TMEMBER(_mode));
+	persistMgr->transferBool(TMEMBER(_textMode));
+
+	uint32 pos = 0;
+	if (persistMgr->getIsSaving()) {
+		pos = getPos();
+		persistMgr->transferUint32(TMEMBER(pos));
+	} else {
+		persistMgr->transferUint32(TMEMBER(pos));
+
+		// try to re-open file if needed
+		_writeFile = nullptr;
+		_readFile = nullptr;
+
+		if (_mode != 0) {
+			// open for reading
+			if (_mode == 1) {
+				_readFile = _game->_fileManager->openFile(_filename);
+				if (!_readFile) {
+					close();
+				}
+			}
+			// open for writing / appending
+			else {
+				if (_textMode) {
+					if (_mode == 2) {
+						_writeFile = openForWrite(_filename, false);
+					} else {
+						_writeFile = openForAppend(_filename, false);
+					}
+				} else {
+					if (_mode == 2) {
+						_writeFile = openForWrite(_filename, true);
+					} else {
+						_writeFile = openForAppend(_filename, true);
+					}
+				}
+				if (_writeFile) {
+					close();
+				}
+			}
+			setPos(pos);
+		}
+	}
+
+	return STATUS_OK;
+}
+
+Common::WriteStream *SXFile::openForWrite(const Common::String &filename, bool binary) {
+	return BaseFileManager::getEngineInstance()->openFileForWrite(_filename);
+}
+
+// Should replace fopen(..., "ab+") and fopen(..., "a+")
+Common::WriteStream *SXFile::openForAppend(const Common::String &filename, bool binary) {
+	warning("SXFile::openForAppend - WriteFiles with limited support as non-append mode");
+	return BaseFileManager::getEngineInstance()->openFileForWrite(_filename);
+}
+
+} // End of namespace Wintermute