From 063284837c8c366e5502b1b0264b8eb807b61732 Mon Sep 17 00:00:00 2001 From: Joe Robinson Date: Wed, 27 Oct 2010 14:21:09 +0100 Subject: Basic upload functionality to predifined location, with basic file browser --- src/org/apache/commons/net/util/ListenerList.java | 63 +++++++ src/org/apache/commons/net/util/SubnetUtils.java | 211 ++++++++++++++++++++++ 2 files changed, 274 insertions(+) create mode 100644 src/org/apache/commons/net/util/ListenerList.java create mode 100644 src/org/apache/commons/net/util/SubnetUtils.java (limited to 'src/org/apache/commons/net/util') diff --git a/src/org/apache/commons/net/util/ListenerList.java b/src/org/apache/commons/net/util/ListenerList.java new file mode 100644 index 0000000..796fb78 --- /dev/null +++ b/src/org/apache/commons/net/util/ListenerList.java @@ -0,0 +1,63 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +package org.apache.commons.net.util; + +import java.io.Serializable; +import java.util.EventListener; +import java.util.Iterator; +import java.util.concurrent.CopyOnWriteArrayList; + +/** + * @author Daniel F. Savarese + */ + +public class ListenerList implements Serializable, Iterable +{ + private final CopyOnWriteArrayList __listeners; + + public ListenerList() + { + __listeners = new CopyOnWriteArrayList(); + } + + public void addListener(EventListener listener) + { + __listeners.add(listener); + } + + public void removeListener(EventListener listener) + { + __listeners.remove(listener); + } + + public int getListenerCount() + { + return __listeners.size(); + } + + /** + * Return an {@link Iterator} for the {@link EventListener} instances + * + * @since 2.0 + * TODO Check that this is a good defensive strategy + */ + public Iterator iterator() { + return __listeners.iterator(); + } + +} diff --git a/src/org/apache/commons/net/util/SubnetUtils.java b/src/org/apache/commons/net/util/SubnetUtils.java new file mode 100644 index 0000000..90cc6e8 --- /dev/null +++ b/src/org/apache/commons/net/util/SubnetUtils.java @@ -0,0 +1,211 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. + * The ASF licenses this file to You under the Apache License, Version 2.0 + * (the "License"); you may not use this file except in compliance with + * the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ +package org.apache.commons.net.util; + +import java.util.regex.Matcher; +import java.util.regex.Pattern; + +/** + * A class that performs some subnet calculations given a network address and a subnet mask. + * @see http://www.faqs.org/rfcs/rfc1519.html + * @author + * @since 2.0 + */ +public class SubnetUtils { + + private static final String IP_ADDRESS = "(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})\\.(\\d{1,3})"; + private static final String SLASH_FORMAT = IP_ADDRESS + "/(\\d{1,3})"; + private static final Pattern addressPattern = Pattern.compile(IP_ADDRESS); + private static final Pattern cidrPattern = Pattern.compile(SLASH_FORMAT); + private static final int NBITS = 32; + + private int netmask = 0; + private int address = 0; + private int network = 0; + private int broadcast = 0; + + /** + * Constructor that takes a CIDR-notation string, e.g. "192.168.0.1/16" + * @param cidrNotation A CIDR-notation string, e.g. "192.168.0.1/16" + */ + public SubnetUtils(String cidrNotation) { + calculate(cidrNotation); + } + + /** + * Constructor that takes two dotted decimal addresses. + * @param address An IP address, e.g. "192.168.0.1" + * @param mask A dotted decimal netmask e.g. "255.255.0.0" + */ + public SubnetUtils(String address, String mask) { + calculate(toCidrNotation(address, mask)); + } + + /** + * Convenience container for subnet summary information. + * + */ + public final class SubnetInfo { + private SubnetInfo() {} + + private int netmask() { return netmask; } + private int network() { return network; } + private int address() { return address; } + private int broadcast() { return broadcast; } + private int low() { return network() + 1; } + private int high() { return broadcast() - 1; } + + public boolean isInRange(String address) { return isInRange(toInteger(address)); } + private boolean isInRange(int address) { return ((address-low()) <= (high()-low())); } + + public String getBroadcastAddress() { return format(toArray(broadcast())); } + public String getNetworkAddress() { return format(toArray(network())); } + public String getNetmask() { return format(toArray(netmask())); } + public String getAddress() { return format(toArray(address())); } + public String getLowAddress() { return format(toArray(low())); } + public String getHighAddress() { return format(toArray(high())); } + public int getAddressCount() { return (broadcast() - low()); } + + public int asInteger(String address) { return toInteger(address); } + + public String getCidrSignature() { + return toCidrNotation( + format(toArray(address())), + format(toArray(netmask())) + ); + } + + public String[] getAllAddresses() { + String[] addresses = new String[getAddressCount()]; + for (int add = low(), j=0; add <= high(); ++add, ++j) { + addresses[j] = format(toArray(add)); + } + return addresses; + } + } + + /** + * Return a {@link SubnetInfo} instance that contains subnet-specific statistics + * @return + */ + public final SubnetInfo getInfo() { return new SubnetInfo(); } + + /* + * Initialize the internal fields from the supplied CIDR mask + */ + private void calculate(String mask) { + Matcher matcher = cidrPattern.matcher(mask); + + if (matcher.matches()) { + address = matchAddress(matcher); + + /* Create a binary netmask from the number of bits specification /x */ + int cidrPart = rangeCheck(Integer.parseInt(matcher.group(5)), 0, NBITS-1); + for (int j = 0; j < cidrPart; ++j) { + netmask |= (1 << 31-j); + } + + /* Calculate base network address */ + network = (address & netmask); + + /* Calculate broadcast address */ + broadcast = network | ~(netmask); + } + else + throw new IllegalArgumentException("Could not parse [" + mask + "]"); + } + + /* + * Convert a dotted decimal format address to a packed integer format + */ + private int toInteger(String address) { + Matcher matcher = addressPattern.matcher(address); + if (matcher.matches()) { + return matchAddress(matcher); + } + else + throw new IllegalArgumentException("Could not parse [" + address + "]"); + } + + /* + * Convenience method to extract the components of a dotted decimal address and + * pack into an integer using a regex match + */ + private int matchAddress(Matcher matcher) { + int addr = 0; + for (int i = 1; i <= 4; ++i) { + int n = (rangeCheck(Integer.parseInt(matcher.group(i)), 0, 255)); + addr |= ((n & 0xff) << 8*(4-i)); + } + return addr; + } + + /* + * Convert a packed integer address into a 4-element array + */ + private int[] toArray(int val) { + int ret[] = new int[4]; + for (int j = 3; j >= 0; --j) + ret[j] |= ((val >>> 8*(3-j)) & (0xff)); + return ret; + } + + /* + * Convert a 4-element array into dotted decimal format + */ + private String format(int[] octets) { + StringBuilder str = new StringBuilder(); + for (int i =0; i < octets.length; ++i){ + str.append(octets[i]); + if (i != octets.length - 1) { + str.append("."); + } + } + return str.toString(); + } + + /* + * Convenience function to check integer boundaries + */ + private int rangeCheck(int value, int begin, int end) { + if (value >= begin && value <= end) + return value; + + throw new IllegalArgumentException("Value out of range: [" + value + "]"); + } + + /* + * Count the number of 1-bits in a 32-bit integer using a divide-and-conquer strategy + * see Hacker's Delight section 5.1 + */ + int pop(int x) { + x = x - ((x >>> 1) & 0x55555555); + x = (x & 0x33333333) + ((x >>> 2) & 0x33333333); + x = (x + (x >>> 4)) & 0x0F0F0F0F; + x = x + (x >>> 8); + x = x + (x >>> 16); + return x & 0x0000003F; + } + + /* Convert two dotted decimal addresses to a single xxx.xxx.xxx.xxx/yy format + * by counting the 1-bit population in the mask address. (It may be better to count + * NBITS-#trailing zeroes for this case) + */ + private String toCidrNotation(String addr, String mask) { + return addr + "/" + pop(toInteger(mask)); + } +} -- cgit v1.2.3