1 files changed, 74 insertions, 0 deletions
diff --git a/lib/private/MemoryInfo.php b/lib/private/MemoryInfo.php
new file mode 100644
index 00000000000..9b5c709b4a9
--- /dev/null
+++ b/lib/private/MemoryInfo.php
@@ -0,0 +1,74 @@
+<?php
+
+declare(strict_types=1);
+
+/**
+ * SPDX-FileCopyrightText: 2018 Nextcloud GmbH and Nextcloud contributors
+ * SPDX-License-Identifier: AGPL-3.0-or-later
+ */
+
+namespace OC;
+
+use OCP\Util;
+
+/**
+ * Helper class that covers memory info.
+ */
+class MemoryInfo {
+	public const RECOMMENDED_MEMORY_LIMIT = 512 * 1024 * 1024;
+
+	/**
+	 * Tests if the memory limit is greater or equal the recommended value.
+	 *
+	 * @return bool
+	 */
+	public function isMemoryLimitSufficient(): bool {
+		$memoryLimit = $this->getMemoryLimit();
+		return $memoryLimit === -1 || $memoryLimit >= self::RECOMMENDED_MEMORY_LIMIT;
+	}
+
+	/**
+	 * Returns the php memory limit.
+	 *
+	 * @return int|float The memory limit in bytes.
+	 */
+	public function getMemoryLimit(): int|float {
+		$iniValue = trim(ini_get('memory_limit'));
+		if ($iniValue === '-1') {
+			return -1;
+		} elseif (is_numeric($iniValue)) {
+			return Util::numericToNumber($iniValue);
+		} else {
+			return $this->memoryLimitToBytes($iniValue);
+		}
+	}
+
+	/**
+	 * Converts the ini memory limit to bytes.
+	 *
+	 * @param string $memoryLimit The "memory_limit" ini value
+	 */
+	private function memoryLimitToBytes(string $memoryLimit): int|float {
+		$last = strtolower(substr($memoryLimit, -1));
+		$number = substr($memoryLimit, 0, -1);
+		if (is_numeric($number)) {
+			$memoryLimit = Util::numericToNumber($number);
+		} else {
+			throw new \InvalidArgumentException($number . ' is not a valid numeric string (in memory_limit ini directive)');
+		}
+
+		// intended fall through
+		switch ($last) {
+			case 'g':
+				$memoryLimit *= 1024;
+				// no break
+			case 'm':
+				$memoryLimit *= 1024;
+				// no break
+			case 'k':
+				$memoryLimit *= 1024;
+		}
+
+		return $memoryLimit;
+	}
+}