input/InputStream: check offset in Rewind()

Don't call Seek() if the stream is already at the beginning. This avoids unnecessary exceptions if seeking is not implemented by an Inputstream implementation.

input/InputStream: check offset in Rewind()
9ed4fac3 · Max Kellermann · 81b2b4a8 · 9ed4fac3
Commit 9ed4fac3 authored May 31, 2019 by Max Kellermann
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Showing with 4 additions and 2 deletions

InputStream.hxx src/input/InputStream.hxx +4 -2

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--- a/src/input/InputStream.hxx
+++ b/src/input/InputStream.hxx
@@ -287,11 +287,13 @@ public:
 	 * for Seek(0, error).
 	 */
 	void Rewind(std::unique_lock<Mutex> &lock) {
-		Seek(lock, 0);
+		if (offset > 0)
+			Seek(lock, 0);
 	}

 	void LockRewind() {
-		LockSeek(0);
+		std::unique_lock<Mutex> lock(mutex);
+		Rewind(lock);
 	}

 	/**