a0eb385c2e
In order to determine the type of a compressed file, we have to read in the first four bytes which may also be important for decompression purposes, to do that we would pass the buffer that we have already read in, along with the size of it. Rename header1 to fourbytes to make that explicit, and remove all checks for prelen. Reported by: cem Reviewed by: cem MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D24034
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