imported AGI engine

svn-id: r22588

1 files changed, 167 insertions, 0 deletions

diff --git a/engines/agi/objects.cpp b/engines/agi/objects.cpp
new file mode 100644
index 0000000000..352dabcf95
--- /dev/null
+++ b/engines/agi/objects.cpp
@@ -0,0 +1,167 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2006 The ScummVM project
+ *
+ * Copyright (C) 1999-2003 Sarien Team
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "common/stdafx.h"
+
+#include "agi/agi.h"
+
+namespace Agi {
+
+extern int decode_objects(uint8 *mem, uint32 flen);
+
+static struct agi_object *objects;	/* objects in the game */
+
+int alloc_objects(int n) {
+	if ((objects = (agi_object *) calloc(n, sizeof(struct agi_object))) == NULL)
+		return err_NotEnoughMemory;
+
+	return err_OK;
+}
+
+int decode_objects(uint8 *mem, uint32 flen) {
+	unsigned int i, so, padsize;
+
+	padsize = game.game_flags & ID_AMIGA ? 4 : 3;
+
+	game.num_objects = 0;
+	objects = NULL;
+
+	/* check if first pointer exceeds file size
+	 * if so, its encrypted, else it is not
+	 */
+
+	if (READ_LE_UINT16(mem) > flen) {
+		report("Decrypting objects... ");
+		decrypt(mem, flen);
+		report("done.\n");
+	}
+
+	/* alloc memory for object list
+	 * byte 3 = number of animated objects. this is ignored.. ??
+	 */
+	if (READ_LE_UINT16(mem) / padsize >= 256) {
+#ifdef AGDS_SUPPORT
+		/* die with no error! AGDS game needs not to die to work!! :( */
+		return err_OK;
+#else
+		/* no AGDS support, die with error */
+		return err_BadResource;
+#endif
+	}
+
+	game.num_objects = READ_LE_UINT16(mem) / padsize;
+	debugC(5, kDebugLevelResources, "num_objects = %d (padsize = %d)", game.num_objects, padsize);
+
+	if (alloc_objects(game.num_objects) != err_OK)
+		return err_NotEnoughMemory;
+
+	/* build the object list */
+	for (i = 0, so = padsize; i < game.num_objects; i++, so += padsize) {
+		int offset;
+
+		(objects + i)->location = *(mem + so + 2);
+		offset = READ_LE_UINT16(mem + so) + padsize;
+
+		if ((uint) offset < flen) {
+			(objects + i)->name = (char *)strdup((const char *)mem + offset);
+		} else {
+			printf("ERROR: object %i name beyond object filesize! "
+					"(%04x > %04x)\n", i, offset, flen);
+			(objects + i)->name = strdup("");
+		}
+	}
+	report("Reading objects: %d objects read.\n", game.num_objects);
+
+	return err_OK;
+
+}
+
+int load_objects(char *fname) {
+	Common::File fp;
+	uint32 flen;
+	uint8 *mem;
+	char *path;
+
+	objects = NULL;
+	game.num_objects = 0;
+
+	debugC(5, kDebugLevelResources, "(fname = %s)", fname);
+	path = fname;
+	report("Loading objects: %s\n", path);
+
+	if (!fp.open(path))
+		return err_BadFileOpen;
+
+	fp.seek(0, SEEK_END);
+	flen = fp.pos();
+	fp.seek(0, SEEK_SET);
+
+	if ((mem = (uint8 *) calloc(1, flen + 32)) == NULL) {
+		fp.close();
+		return err_NotEnoughMemory;
+	}
+
+	fp.read(mem, flen);
+	fp.close();
+
+	decode_objects(mem, flen);
+	free(mem);
+	return err_OK;
+}
+
+void unload_objects() {
+	unsigned int i;
+
+	if (objects != NULL) {
+		for (i = 0; i < game.num_objects; i++)
+			free(objects[i].name);
+		free(objects);
+	}
+}
+
+void object_set_location(unsigned int n, int i) {
+	if (n >= game.num_objects) {
+		report("Error: Can't access object %d.\n", n);
+		return;
+	}
+	objects[n].location = i;
+}
+
+int object_get_location(unsigned int n) {
+	if (n >= game.num_objects) {
+		report("Error: Can't access object %d.\n", n);
+		return 0;
+	}
+	return objects[n].location;
+}
+
+char *object_name(unsigned int n) {
+	if (n >= game.num_objects) {
+		report("Error: Can't access object %d.\n", n);
+		return "";
+	}
+	return objects[n].name;
+}
+
+}                             // End of namespace Agi