Allow chunk size to be encoded with uppercase hexadecimal digits

Author: mdrost

src/ChunkedStreamDecoder.php

@@ -117,7 +117,7 @@ protected function iterateBuffer()
                     $lengthChunk = "0";
                 }
             }
-            if (dechex(hexdec($lengthChunk)) !== $lengthChunk) {
+            if (dechex(hexdec($lengthChunk)) !== strtolower($lengthChunk)) {
                 $this->emit('error', [
                     new Exception('Unable to validate "' . $lengthChunk . '" as chunk length header'),
                 ]);

tests/DecodeChunkedStreamTest.php

@@ -73,6 +73,9 @@ public function provideChunkedEncoding()
             ],
             'end-chunk-zero-check-3' => [
                 ["00004\r\nWiki\r\n005\r\npedia\r\ne\r\n in\r\n\r\nchunks.\r\n0000\r\n\r\n"]
+            ],
+            'uppercase-chunk' => [
+                ["4\r\nWiki\r\n5\r\npedia\r\nE\r\n in\r\n\r\nchunks.\r\n0\r\n\r\n"],
             ]
         ];
     }