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3cad9e6851
Remember channel-size to no re-read it for every read-access, but reset it if we extend the size of the file profiling indicates Channel.size() sometimes has similar runtime overhead as position() or read()! git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@1877816 13f79535-47bb-0310-9956-ffa450edef68