# The share file has the following layout:
# 0x00: share file version number, four bytes, current version is 1
# 0x04: share data length, four bytes big-endian = A # See Footnote 1 below.
-# 0x08: number of leases, four bytes big-endian (unused)
+# 0x08: number of leases, four bytes big-endian
# 0x0c: beginning of share data (see immutable.layout.WriteBucketProxy)
# A+0x0c = B: first lease. Lease format is:
# B+0x00: owner number, 4 bytes big-endian, 0 is reserved for no-owner