handle seeks in countwrapper

src/CountWrapper.php

@@ -60,6 +60,17 @@ protected function open() {
 		return true;
 	}
 
+    public function stream_seek($offset, $whence = SEEK_SET) {
+        if ($whence === SEEK_SET) {
+            $this->readCount = $offset;
+            $this->writeCount = $offset;
+        } else if ($whence === SEEK_CUR) {
+            $this->readCount += $offset;
+            $this->writeCount += $offset;
+        }
+        return parent::stream_seek($offset, $whence);
+    }
+
 	public function dir_opendir($path, $options) {
 		return $this->open();
 	}

tests/CountWrapperTest.php

@@ -46,4 +46,22 @@ public function testWriteCount() {
 		fclose($wrapped);
 		$this->assertSame(6, $count);
 	}
+
+    public function testReadCountSeek() {
+        $count = 0;
+
+        $source = fopen('php://temp', 'r+');
+        fwrite($source, 'foobar');
+        rewind($source);
+
+        $wrapped = CountWrapper::wrap($source, function ($readCount) use (&$count) {
+            $count = $readCount;
+        });
+
+        stream_get_contents($wrapped);
+        fseek($wrapped, 3);
+        stream_get_contents($wrapped);
+        fclose($wrapped);
+        $this->assertSame(6, $count);
+    }
 }