def write_header(f):
	"""write_header(file(wb))
	Writes the header to the given file."""
	# b'WOT' magic
	f.write(b'WOT')
	# Version number
	f.write(bytes(0))

def write_entry(f, salt, hashed_host, fingerprint, comment):
	"""write_entry(file(wb), bytes[32], bytes[32], bytes[32], bytes[0…2¹⁶-1])
	Writes an entry to the given file."""
	assert type(salt) == bytes and len(salt) == 32
	assert type(hashed_host) == bytes and len(hashed_host) == 32
	assert type(fingerprint) == bytes and len(fingerprint) == 32
	assert type(comment) == bytes and 0 <= len(comment) <= (1<<16) - 1

	# u8[32]: salt
	f.write(salt)

	# u8[32]: hashed_host
	f.write(hashed_host)

	# u8[32]: fingerprint
	f.write(fingerprint)

	# u16le: len(comment)
	comment_len = len(comment)
	f.write(bytes([comment_len & 0xff, comment_len >> 8]))

	# u8[]: comment
	f.write(comment)

def write(f, entries):
	"""write(file(wb), [Entry])
	Creates a file containing all of the entries"""
	write_header(f)
	
	for entry in entries:
		write_entry(f, entry.salt, entry.hashed_host, entry.fingerprint, entry.comment)