Start implementing how crosses are saved in database

util.php

@@ -93,6 +93,51 @@ function unpack_scores($blob) {
     return array_map(function($c) { return unpack('C', $c)[1]; }, str_split($blob));
 }
 
+function pack_crosses($crosses) {
+    $blob = '';
+    $byte = 0;
+    $i = 7;
+    foreach ($crosses as $bit) {
+        $byte |= intval($bit) << $i;
+        if ($i == 0) {
+            $blob .= chr($byte);
+            $byte = 0;
+            $i = 7;
+        } else {
+            $i--;
+        }
+    }
+    if ($i != 7)
+        $blob .= pack('C', $byte);
+    return $blob;
+}
+
+function unpack_crosses($bitmap, $limit=0) {
+    $crosses = array();
+    foreach($bitmap as $c) {
+        for ($i = 7; $i >= 0; $i--) {
+            $crosses[] = intval(!!(ord($c) & (1 << $i)));
+            if (count($crosses) == $limit)
+                return $crosses;
+        }
+    }
+    return $crosses;
+}
+
+function show_crosses($bitmap) {
+    foreach($bitmap as $c) {
+        for ($i = 7; $i >= 0; $i--)
+            echo intval(!!(ord($c) & (1 << $i)));
+
+        echo ' ';
+    }
+    echo "\n";
+}
+
+//show_crosses("\x0b\xff\x00\x08");
+show_crosses(pack_crosses(array(1, 0, 1, 0, 0, 0, 0, 0)));
+exit;
+
 function match_arrows($row) {
     return sprintf('%d &times; %d', $row->turns, $row->arrows);
 }