Improved signature lookup #851
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Caching the part of the stream which potentially contains the signature improves the performance in case of streams where seeking backwards is costly
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Caching the part of the stream which potentially contains the signature improves the performance in case of streams where seeking backwards is costly. If the underlying stream is for example an Azure blob stream which pretends to contain a zip file but actually does not then the lookup took several minutes to figure this out.
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