3 files changed, 71 insertions, 16 deletions

diff --git a/inc/Item.inc b/inc/Item.inc
index bef6d00..8e90998 100644
--- a/inc/Item.inc
+++ b/inc/Item.inc
@@ -20,6 +20,10 @@ class Item {
 		$item->addChild("icon", $this->icon);
 		$item->addChild("desc", $this->desc);
 	}
+
+	public static function fromXML($xml) {
+		return new static((string)$xml->name, +(string)$xml->cost /* convert to number */, (string)$xml->icon, (string)$xml->desc);
+	}
 }
 
 ?>
diff --git a/inc/messages.inc b/inc/messages.inc
index 9f3a09d..4938fa1 100644
--- a/inc/messages.inc
+++ b/inc/messages.inc
@@ -9,6 +9,9 @@ $messages = array(
 
 	"gamesave_ok" => "Game saved.",
 	"gamesave_error" => "An error occured when trying to save the game.",
+	"gamesave_not_found" => "Couldn't find the specified save file.",
+	"gamesave_delete_fail" => "Couldn't delete the specified save file.",
+	"gamesave_delete_success" => "Game save successfully removed from server",
 );
 
 function sendMessage($type, $msg) {
diff --git a/inc/savegame.inc b/inc/savegame.inc
index f3b6da6..1fa95b0 100644
--- a/inc/savegame.inc
+++ b/inc/savegame.inc
@@ -4,23 +4,22 @@ require_once("inc/messages.inc");
 
 define("SAVEDIR", "data/save");
 
-function genXML($v, $k, $xml) {
-	if(is_object($v))
-	{
-		if(is_callable(array($v, "addToXML")))
-			$v->addToXML($xml->addChild($k));
+function genXML($table, $xml) {
+	foreach($table as $k => $v) {
+		if(is_object($v)) { // Object: either Item or Inventory
+			if(is_callable(array($v, "addToXML"))) // Check if the object has a addToXML method
+				$v->addToXML($xml->addChild($k));
+		} elseif(is_array($v)) // Nested array
+			genXML($v, $xml->addChild($k));
+		else // Single value (numeric or string)
+			$xml->addChild($k, $v);
 	}
-	else
-		$xml->addChild($k, $v);
 }
 
 function genSave() {
-	header("Content-Type: application/xml");
 	$save = new SimpleXMLElement("<save/>");
-
-	array_walk_recursive($_SESSION, "genXML", $save);
+	genXML($_SESSION, $save);
 	return $save;
-	echo $save->asXML();
 }
 
 function genFilename() {
@@ -34,11 +33,60 @@ function saveGame() {
 }
 
 function downSave() {
-	$save = genSave();
-	header("Content-Type: application/xml");
-	header("Content-Disposition: attachment; filename=".genFilename());
-	header("Pragma: no-cache");
-	echo $save->asXML();
+	$save = "";
+	$filename = "";
+
+	if(empty($_GET["filename"])) {
+		$filename = genFilename();
+		$save = genSave()->asXML(); // Send current game save file if no file specified
+	} else {
+		$filename = $_GET["filename"];
+		$save = file_get_contents(SAVEDIR . "/" . $filename);
+		if(empty($save)) return; // Probably file not found
+	}
+
+	header("Content-Type: application/xml"); // Force browser to intepret the file as XML
+	header("Content-Disposition: attachment; filename=".$filename); // Force download with specific filename
+	header("Cache-Control: no-cache"); // Avoid storing save file in proxy/browser cache
+	echo $save;
+}
+
+function listSaves() {
+	chdir(SAVEDIR); // Go to SAVEDIR folder, avoiding leading folder name in file list
+	echo json_encode(glob("*.save.xml"));
 }
 
+function parseSave($xml, &$table) { // Passing $table by reference
+	foreach($xml as $k => $v) {
+		if($v->count() == 0) { // No child, treat as string
+			$v = (string)$v;
+			if(is_numeric($v)) $v = +$v; // If it is in fact a number, treat it that way using PHP unary '+' coercion
+			$table[$k] = $v;
+		} elseif($k == "inventory") { // Special case for inventory: objects need to be created
+			foreach($v as $item) Inventory::addItem(Item::fromXML($item));
+		} else { // If nested array
+			$table[$k] = array();
+			parseSave($v, $table[$k]);
+		} // Other types unsupported (unused)
+	}
+}
+
+function deleteSave() {
+	if(empty($_POST["filename"])) return;
+	$path = SAVEDIR . "/" . basename($_POST["filename"]); // remove any leading directory
+	if(file_exists($path) && unlink($path))
+		sendInfo("gamesave_delete_success");
+	else sendError("gamesave_delete_fail");
+}
+
+function loadSave() {
+	if(empty($_POST["filename"])) return;
+	$xml = simplexml_load_file(SAVEDIR . "/" . $_POST["filename"]);
+	if(empty($xml)) {
+		sendError("gamesave_not_found");
+		return;
+	}
+	$_SESSION = array(); // drop current game
+	parseSave($xml, $_SESSION);
+}
 ?>