input/buffered: fix bogus offset after Seek()

Instead of copying the offset from our `input`, copy the requested offset to our `offset` attribute. By the time Seek() finishes, our input's offset may have advanced already, having read some more data, thus giving us a bogus offset. This fixes spurious decoder failues (closes #320).

input/buffered: fix bogus offset after Seek()
c8e6f50d · Max Kellermann · 9263d6d0 · c8e6f50d
Commit c8e6f50d authored Jul 25, 2018 by Max Kellermann
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BufferedInputStream.cxx src/input/BufferedInputStream.cxx +1 -1

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--- a/src/input/BufferedInputStream.cxx
+++ b/src/input/BufferedInputStream.cxx
@@ -85,7 +85,7 @@ BufferedInputStream::Seek(offset_type new_offset)
 	if (seek_error)
 		std::rethrow_exception(std::exchange(seek_error, {}));

-	offset = input->GetOffset();
+	offset = new_offset;
 }

 bool