class Block:
def __init__(self, block_bytes_array, _block_num):
bytes_magic = block_bytes_array[:4]
bytes_rest = block_bytes_array[4:]
bytes_size = bytes_rest[:4]
bytes_rest = bytes_rest[4:]
bytes_header = bytes_rest[:80]
bytes_rest = bytes_rest[80:]
bytes_tx_count = bytes_rest[:1] # get varInt prefix
bytes_rest = bytes_rest[1:]
# check if varInt is on 1, 2, 4, or 8 bytes
if(bytes_tx_count[0] == 253): # varInt is on 2 bytes AFTER the prefix
bytes_tx_count = bytes_rest[:2]
bytes_rest = bytes_rest[2:]
elif(bytes_tx_count[0] == 254): # varInt is on 4 bytes AFTER the prefix
bytes_tx_count = bytes_rest[:4]
bytes_rest = bytes_rest[4:]
elif(bytes_tx_count[0] == 255): # varInt is on 8 bytes AFTER the prefix
bytes_tx_count = bytes_rest[:8]
bytes_rest = bytes_rest[8:]
# else varInt was on 1 bytes, nothing to do
bytes_tx_data = bytes_rest
self.block_num = _block_num
self.magic = int.from_bytes(bytes_magic, byteorder='little')
self.size = int.from_bytes(bytes_size, byteorder='little')
self.tx_count = int.from_bytes(bytes_tx_count, byteorder='little')
self.header = Header(bytes_header)
self.transactions = Transactions(bytes_tx_data, self.tx_count)
def getNet(self):
if(self.magic == 3652501241): return 'main network'
elif(self.magic == 3669344250): return 'test network'
elif(self.magic == 118034699): return 'test network 3'
elif(self.magic == 4273258233): return 'namecoin network'
else: return 'unknown network'
def print(self):
print()
print('Block :', self.block_num)
print(' ', self.getNet())
print(' block size :', self.size)
print(' ', self.tx_count, 'transaction(s)')
self.header.print()
self.transactions.print()
print()
print('*** END OF BLOCK',self.block_num,'***')
