added new/changed files

checkUploadLimit.php

@@ -0,0 +1,44 @@
+<?php
+require_once 'config.php';
+
+function convertToBytes($size) {
+    $number = substr($size, 0, -1);
+    switch (strtoupper(substr($size, -1))) {
+        case 'G':
+            return $number * 1024 * 1024 * 1024;
+        case 'M':
+            return $number * 1024 * 1024;
+        case 'K':
+            return $number * 1024;
+        default:
+            return $size;
+    }
+}
+
+function getDirectorySize($dir) {
+    $size = 0;
+    foreach (new RecursiveIteratorIterator(new RecursiveDirectoryIterator($dir)) as $file) {
+        if ($file->isFile()) {
+            $size += $file->getSize();
+        }
+    }
+    return $size;
+}
+
+$response = ['uploadAllowed' => false, 'message' => ''];
+$fileSize = isset($_POST['fileSize']) ? (int)$_POST['fileSize'] : 1000000000000;
+
+$totalUploadLimit = convertToBytes(TOTAL_UPLOAD_SIZE);
+$currentDirSize = getDirectorySize(UPLOAD_DIR);
+$newSize = $currentDirSize + $fileSize;
+
+if ($newSize > $totalUploadLimit) {
+    $response['message'] = 'Upload denied. Total upload limit exceeded.';
+    $_SESSION['uploadAllowed'] = false;
+} else {
+    $response['message'] = 'Upload allowed. Starting upload...';
+    $_SESSION['uploadAllowed'] = true;
+}
+
+echo json_encode($response);
+?>