def pop_short_channel_id(byte_string):
if not len(byte_string) >= 8:
return None, None, "underrun while popping short_channel_id"
block_height = b2i(byte_string[:3])
tx_index = b2i(byte_string[3:6])
output_index = b2i(byte_string[6:8])
formatted = "%dx%dx%d" % (block_height, tx_index, output_index)
return formatted, byte_string[8:], None
def peek_64(byte_string):
if len(byte_string) < 8:
return None, "underrun while peeking a uint64"
val = b2i(byte_string[0:8])
if val < 0x100000000:
return None, "not a minimally encoded uint64"
return val, None
def peek_32(byte_string):
if len(byte_string) < 4:
return None, "underrun while peeking a uint32"
val = b2i(byte_string[0:4])
if val < 0x10000:
return None, "not a minimally encoded uint32"
return val, None
def peek_16(byte_string):
if len(byte_string) < 2:
return None, "underrun while peeking a uint16"
val = b2i(byte_string[0:2])
if val < 0xfd:
return None, "not a minimally encoded unit16"
return val, None
def pop_tu64(n_bytes, byte_string):
if n_bytes > 8:
return None, None, "cannot pop more than 8 bytes for a tu64"
if len(byte_string) < n_bytes:
return None, None, "underrun while popping tu62"
if n_bytes == 0:
return 0, byte_string, None
val = b2i(byte_string[:n_bytes])
if n_bytes != Namespace.minimal_tu_bytes(val):
return None, None, "not minimal encoding for value"
return val, byte_string[n_bytes:], None
def pop_u64(byte_string):
if len(byte_string) < 8:
return None, None, "underrun while popping a u64"
return b2i(byte_string[:8]), byte_string[8:], None
def pop_u32(byte_string):
if len(byte_string) < 4:
return None, None, "underrun while popping a u32"
return b2i(byte_string[:4]), byte_string[4:], None
def pop_u16(byte_string):
if len(byte_string) < 2:
return None, None, "underrun while popping a u16"
return b2i(byte_string[:2]), byte_string[2:], None
def pop_u8(byte_string):
if len(byte_string) < 1:
return None, None, "underrun while popping a u8"
return b2i(byte_string[:1]), byte_string[1:], None
def peek_8(byte_string):
if len(byte_string) < 1:
return None, "underrun while peeking a uint8"
return b2i(byte_string[0:1]), None