Am 21.02.2018 um 15:08 hat Alberto Garcia geschrieben: > This patch fixes several mistakes in the documentation of the > compressed cluster descriptor: > > 1) the documentation claims that the cluster descriptor contains the > number of sectors used to store the compressed data, but what it > actually contains is the number of sectors *minus one* or, in other > words, the number of additional sectors after the first one. > > 2) the width of the fields is incorrectly specified. The number of bits > used by each field is > > x = 62 - (cluster_bits - 8) for the offset field > y = (cluster_bits - 8) for the size field > > So the offset field's location is [0, x-1], not [0, x] as stated. > > 3) the size field does not contain the size of the compressed data, > but rather the number of sectors where that data is stored. The > compressed data starts at the exact point specified in the offset > field and ends when there's enough data to produce a cluster of > decompressed data. Both points can be in the middle of a sector, > allowing several compressed clusters to be stored next to one > another, sharing sectors if necessary. > > Signed-off-by: Alberto Garcia <be...@igalia.com>
Thanks, applied to the block branch. Kevin