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mutable/layout: break unpack_checkstring into unpack_mdmf_checkstring and unpack_sdmf_checkstring, add distinguisher function for checkstrings

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This commit is contained in:
kevan 2011-09-24 17:41:34 -07:00
parent 2187f27ad0
commit e8afe84813
1 changed files with 12 additions and 1 deletions
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13
src/allmydata/mutable/layout.py
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@ -136,13 +136,24 @@ def unpack_share(data):
pubkey, signature, share_hash_chain, block_hash_tree,
share_data, enc_privkey)
def unpack_checkstring(checkstring):
def get_version_from_checkstring(checkstring):
(t, ) = struct.unpack(">B", checkstring[:1])
return t
def unpack_sdmf_checkstring(checkstring):
cs_len = struct.calcsize(PREFIX)
version, seqnum, root_hash, IV = struct.unpack(PREFIX, checkstring[:cs_len])
if version != 0: # TODO: just ignore the share
raise UnknownVersionError("got mutable share version %d, but I only understand version 0" % version)
return (seqnum, root_hash, IV)
def unpack_mdmf_checkstring(checkstring):
cs_len = struct.calcsize(MDMFCHECKSTRING)
checkstring = checkstring[:cs_len]
version, seqnum, root_hash = struct.unpack(MDMFCHECKSTRING, checkstring)
assert version == 1
return (seqnum, root_hash)
def pack_offsets(verification_key_length, signature_length,
share_hash_chain_length, block_hash_tree_length,