* followed by the data. This can be less than
* writesize. Restore, on a short read, can compare the
* length read to the compressed length in the header
* to verify that the read was good. Blocks which don't
* compress well are written uncompressed.
* followed by the data. This can be less than
* writesize. Restore, on a short read, can compare the
* length read to the compressed length in the header
* to verify that the read was good. Blocks which don't
* compress well are written uncompressed.