def deserialize(cls, ctx):
ctx.assert_magic(cls.HEADER_MAGIC)
major = ctx.read_varuint() # FIXME: max-int limit
if major != cls.MAJOR_VERSION:
raise opentimestamps.core.serialize.UnsupportedMajorVersion("Version %d detached timestamp files are not supported" % major)
file_hash_op = CryptOp.deserialize(ctx)
file_hash = ctx.read_bytes(file_hash_op.DIGEST_LENGTH)
timestamp = Timestamp.deserialize(ctx, file_hash)
ctx.assert_eof()
return DetachedTimestampFile(file_hash_op, timestamp)
def deserialize(cls, ctx):
ctx.assert_magic(cls.HEADER_MAGIC)
major = ctx.read_varuint() # FIXME: max-int limit
if major != cls.MAJOR_VERSION:
raise opentimestamps.core.serialize.UnsupportedMajorVersion("Version %d detached timestamp files are not supported" % major)
file_hash_op = CryptOp.deserialize(ctx)
file_hash = ctx.read_bytes(file_hash_op.DIGEST_LENGTH)
timestamp = Timestamp.deserialize(ctx, file_hash)
ctx.assert_eof()
return DetachedTimestampFile(file_hash_op, timestamp)
def open(cls, fd):
"""Open an existing timestamp log
fd must be positioned at the start of the log; the header will be
immediately read and DeserializationError raised if incorrect.
"""
ctx = StreamDeserializationContext(fd)
actual_magic = ctx.read_bytes(len(cls.HEADER_MAGIC))
if cls.HEADER_MAGIC != actual_magic:
raise BadMagicError(cls.HEADER_MAGIC, actual_magic)
file_hash_op = CryptOp.deserialize(ctx)
return cls(fd, file_hash_op)
def open(cls, fd):
"""Open an existing timestamp log
fd must be positioned at the start of the log; the header will be
immediately read and DeserializationError raised if incorrect.
"""
ctx = StreamDeserializationContext(fd)
actual_magic = ctx.read_bytes(len(cls.HEADER_MAGIC))
if cls.HEADER_MAGIC != actual_magic:
raise opentimestamps.core.serialize.BadMagicError(cls.HEADER_MAGIC, actual_magic)
file_hash_op = CryptOp.deserialize(ctx)
return cls(fd, file_hash_op)
