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* fix: re-use embedded union reader if possible Previously, because file.LocationReadCloser embeds a ReadCloser that might be a UnionReader, but doesn't implement the interface itself, the type assertion would fall and Syft would fall back to io.ReadAll to enable seeking on the underlying reader, resulting in a potentially large extra allocation. Instead, check whether the passed ReadCloser is a file.LocationReadCloser, and if so, try to use the embedded ReadCloser as a UnionReader. Signed-off-by: Will Murphy <will.murphy@anchore.com> * lint fix Signed-off-by: Will Murphy <will.murphy@anchore.com> * Assert that underlying reader is returned Signed-off-by: Will Murphy <will.murphy@anchore.com> --------- Signed-off-by: Will Murphy <will.murphy@anchore.com>