From 5d7ca0075904c7ba8d534b4f59f5a40b00e89733 Mon Sep 17 00:00:00 2001
From: Phil Davis <phil@jankaritech.com>
Date: Mon, 27 May 2024 16:15:26 +0545
Subject: [PATCH] throw ParseException when null input is provided

---
 lib/Parser/MimeDir.php               |  6 ++++++
 tests/VObject/Parser/MimeDirTest.php | 19 +++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/lib/Parser/MimeDir.php b/lib/Parser/MimeDir.php
index ddac9642b..be5d87baf 100644
--- a/lib/Parser/MimeDir.php
+++ b/lib/Parser/MimeDir.php
@@ -79,6 +79,12 @@ public function parse($input = null, int $options = 0): ?Document
             $this->setInput($input);
         }
 
+        if (!\is_resource($this->input)) {
+            // Null was passed as input, but there was no existing input buffer
+            // There is nothing to parse.
+            throw new ParseException('No input provided to parse');
+        }
+
         if (0 !== $options) {
             $this->options = $options;
         }
diff --git a/tests/VObject/Parser/MimeDirTest.php b/tests/VObject/Parser/MimeDirTest.php
index 24656f886..db5735b0c 100644
--- a/tests/VObject/Parser/MimeDirTest.php
+++ b/tests/VObject/Parser/MimeDirTest.php
@@ -101,6 +101,25 @@ public function testDecodeUnsupportedInlineCharset(): void
         $mimeDir->parse($vcard);
     }
 
+    public function provideEmptyParserInput(): array
+    {
+        return [
+            [null, 'No input provided to parse'],
+            ['', 'End of document reached prematurely'],
+        ];
+    }
+
+    /**
+     * @dataProvider provideEmptyParserInput
+     */
+    public function testParseEmpty($input, $expectedExceptionMessage): void
+    {
+        $this->expectException(ParseException::class);
+        $this->expectExceptionMessage($expectedExceptionMessage);
+        $mimeDir = new MimeDir();
+        $mimeDir->parse($input);
+    }
+
     public function testDecodeWindows1252(): void
     {
         $vcard = <<<VCF