Initial commit

engines/agi/objects.cpp

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+/* 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/>.
+ *
+ */
+
+#include "agi/agi.h"
+
+#include "common/textconsole.h"
+
+namespace Agi {
+
+int AgiEngine::decodeObjects(uint8 *mem, uint32 flen) {
+	unsigned int i, so, padsize, spos;
+
+	padsize = getPlatform() == Common::kPlatformAmiga ? 4 : 3;
+
+	_game.numObjects = 0;
+
+	// check if first pointer exceeds file size
+	// if so, its encrypted, else it is not
+
+	if (READ_LE_UINT16(mem) > flen) {
+		debugN(0, "Decrypting objects... ");
+		decrypt(mem, flen);
+		debug(0, "done.");
+	}
+
+	// alloc memory for object list
+	// byte 3 = number of animated objects. this is ignored.. ??
+	if (READ_LE_UINT16(mem) / padsize > 256) {
+		// die with no error! AGDS game needs not to die to work!! :(
+		return errOK;
+	}
+
+	_game.numObjects = READ_LE_UINT16(mem) / padsize;
+	debugC(5, kDebugLevelResources, "num_objects = %d (padsize = %d)", _game.numObjects, padsize);
+
+	_objects.resize(_game.numObjects);
+
+	// build the object list
+	spos = getVersion() >= 0x2000 ? padsize : 0;
+	for (i = 0, so = spos; i < _game.numObjects; i++, so += padsize) {
+		int offset;
+
+		_objects[i].location = *(mem + so + 2);
+		offset = READ_LE_UINT16(mem + so) + spos;
+
+		if ((uint) offset < flen) {
+			_objects[i].name = (const char *)mem + offset;
+		} else {
+			warning("object %i name beyond object filesize (%04x > %04x)", i, offset, flen);
+			_objects[i].name.clear();
+		}
+
+		// Don't show the invalid "?" object in ego's inventory in the fanmade
+		// game Beyond the Titanic 2 (bug #5523).
+		if (_objects[i].name == "?" && _objects[i].location == EGO_OWNED)
+			_objects[i].location = 0;
+	}
+	debug(0, "Reading objects: %d objects read.", _game.numObjects);
+
+	return errOK;
+}
+
+int AgiEngine::loadObjects(const char *fname) {
+	Common::File fp;
+
+	debugC(5, kDebugLevelResources, "(Loading objects '%s')", fname);
+
+	if (!fp.open(fname))
+		return errBadFileOpen;
+
+	return loadObjects(fp, fp.size());
+}
+
+/**
+ * Read and decode objects, and store them in the internal structure.
+ *
+ * @param  fp    File pointer
+ * @param  flen  File length
+ */
+int AgiEngine::loadObjects(Common::SeekableReadStream &fp, int flen) {
+	uint8 *mem;
+
+	if ((mem = (uint8 *)calloc(1, flen + 32)) == nullptr) {
+		return errNotEnoughMemory;
+	}
+
+	fp.read(mem, flen);
+
+	decodeObjects(mem, flen);
+	free(mem);
+	return errOK;
+}
+
+void AgiEngine::objectSetLocation(uint16 objectNr, int location) {
+	if (objectNr >= _game.numObjects) {
+		warning("AgiEngine::objectSetLocation: Can't access object %d", objectNr);
+		return;
+	}
+	_objects[objectNr].location = location;
+}
+
+int AgiEngine::objectGetLocation(uint16 objectNr) {
+	if (objectNr >= _game.numObjects) {
+		warning("AgiEngine::objectGetLocation: Can't access object %d", objectNr);
+		return 0;
+	}
+	return _objects[objectNr].location;
+}
+
+const char *AgiEngine::objectName(uint16 objectNr) {
+	if (objectNr >= _game.numObjects) {
+		warning("AgiEngine::objectName: Can't access object %d", objectNr);
+		return "";
+	}
+	return _objects[objectNr].name.c_str();
+}
+
+} // End of namespace Agi