from pycrc32 import crc32

data = b"123456789"
print(f"crc32 for {data!r} is {crc32(data)}")

from pycrc32 import Hasher

# Create a new Hasher instance
hasher = Hasher()

# Update the hasher with data chunks
hasher.update(b"123456")
hasher.update(b"789")

# Finalize the computation and get the checksum
checksum = hasher.finalize()
print(f"Checksum: {checksum}")

# Reset the hasher to compute another checksum
hasher.reset()
hasher.update(b"The quick brown fox jumps over the lazy dog")
new_checksum = hasher.finalize()
print(f"New checksum: {new_checksum}")

initial_crc = 12345678
hasher = Hasher.with_initial(initial_crc)

hasher.update(b"additional data")
final_checksum = hasher.finalize()
print(f"Final checksum with initial state: {final_checksum}")

hasher1 = Hasher()
hasher1.update(b"Data block 1")
checksum1 = hasher1.finalize()

hasher2 = Hasher()
hasher2.update(b"Data block 2")
checksum2 = hasher2.finalize()

# Combine checksums from hasher1 into hasher2
hasher1.combine(hasher2)  # Combine the state of hasher2 into hasher1

# The final checksum after combination
combined_checksum = hasher1.finalize()
print(f"Combined checksum: {combined_checksum}")