Low bandwidth almost similar file syncing algorithm between two computers

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.MessageDigest;
import java.util.HashMap;
import java.util.List;
import java.util.Map;


public class LowBandwidthSync {

	public static void synchronize(FileSyncClient client, FileSyncServer server, DiffFunction diffFunction) throws Exception {
		""
		"
		Synchronizes files between two computers over a low - bandwidth network.

		Args:
			client: The client computer object(can be extended
				for network communication).
		server: The server computer object(can be extended
			for network communication).
		diffFunction: A
		function that calculates the difference between files.
		""
		"
		// Calculate fingerprints for client files
		Map<String, String> clientFingerprints = new HashMap<>();

		for (File file: client.listFiles()) {
			clientFingerprints.put(file.getName(), hashFile(file));
		}

		// Send fingerprints to server
		server.receiveFingerprints(clientFingerprints);

		// Server compares fingerprints with its own
		Map<String, String> serverFingerprints = server.getFingerprints();
		List<String> changedFiles = compareFingerprints(clientFingerprints, serverFingerprints);

		// Server sends diffs for changed files
		for (String filename: changedFiles) {
			byte[] diffData = diffFunction.calculateDiff(server.getFile(file.getName()), client.getFile(filename));
			client.receiveDiff(filename, diffData);
		}

		// Client applies diffs to update files
		for (Map.Entry < String, byte[] > entry: client.getDiffs().entrySet()) {
			client.applyDiff(entry.getKey(), entry.getValue());
		}
	}

	private static String hashFile(File file) throws Exception {
		MessageDigest digest = MessageDigest.getInstance("SHA-256");
		byte[] buffer = new byte[1024];
		int bytesRead;
		try (FileInputStream inputStream = new FileInputStream(file)) {
			while ((bytesRead = inputStream.read(buffer)) != -1) {
				digest.update(buffer, 0, bytesRead);
			}
		}

		byte[] hash = digest.digest();
		return convertByteArrayToHex(hash); // Convert byte array to hex string
	}

	private static String convertByteArrayToHex(byte[] a) {
		StringBuilder sb = new StringBuilder(a.length * 2);

		for (byte b: a)
			sb.append(String.format("%02x", b & 0xff));
		return sb.toString();
	}

	// Interface definitions for network communication and file operations (replace with actual implementations)
	public interface FileSyncClient {
		List<File> listFiles();
		String getFile(String filename) throws IOException;
		void receiveDiff(String filename, byte[] diffData) throws IOException;
		Map < String, byte[] > getDiffs();
		void applyDiff(String filename, byte[] diffData) throws IOException;
	}

	public interface FileSyncServer {
		void receiveFingerprints(Map<String, String> fingerprints);
		Map<String, String> getFingerprints();
		byte[] getFile(String filename) throws IOException;
	}

	public interface DiffFunction {
		byte[] calculateDiff(File file1, File file2) throws IOException;
	}

	private static List<String> compareFingerprints(Map<String, String> clientFingerprints, Map<String, String> serverFingerprints) {
		List<String> changedFiles = new ArrayList<>();

		for (Map.Entry<String, String> entry: clientFingerprints.entrySet()) {
			if (!serverFingerprints.containsKey(entry.getKey()) || !serverFingerprints.get(entry.getKey()).equals(entry.getValue())) {
				changedFiles.add(entry.getKey());
			}
		}

		return changedFiles;
	}
}

import hashlib

def low_bandwidth_sync(client, server, file_diff_func):
  # Calculate fingerprints for client files
  client_fingerprints = {f: hashlib.sha256(open(f, 'rb').read()).hexdigest() for f in client.list_files()}

  # Send fingerprints to server
  server.receive_fingerprints(client_fingerprints)

  # Server compares fingerprints with its own
  server_fingerprints = server.get_fingerprints()
  changed_files = []
  for filename, fingerprint in client_fingerprints.items():
    if filename not in server_fingerprints or server_fingerprints[filename] != fingerprint:
      changed_files.append(filename)

  # Server sends diffs for changed files
  for filename in changed_files:
    diff_data = file_diff_func(server.get_file(filename), client.get_file(filename))
    client.receive_diff(filename, diff_data)

  # Client applies diffs to update files
  for filename, diff_data in client.get_diffs():
    client.apply_diff(filename, diff_data)

# Example usage (replace with actual file system interaction and network communication)
client_files = ["file1.txt", "file2.txt", "file3.txt"]
server_files = ["file1.txt", "file2.txt", "file4.txt"]

def get_file_diff(file1, file2):
  # Replace with actual diff generation logic
  return "some diff data"

low_bandwidth_sync(client_files, server_files, get_file_diff)