From 554fd8c5195424bdbcabf5de30fdc183aba391bd Mon Sep 17 00:00:00 2001 From: upstream source tree Date: Sun, 15 Mar 2015 20:14:05 -0400 Subject: obtained gcc-4.6.4.tar.bz2 from upstream website; verified gcc-4.6.4.tar.bz2.sig; imported gcc-4.6.4 source tree from verified upstream tarball. downloading a git-generated archive based on the 'upstream' tag should provide you with a source tree that is binary identical to the one extracted from the above tarball. if you have obtained the source via the command 'git clone', however, do note that line-endings of files in your working directory might differ from line-endings of the respective files in the upstream repository. --- libjava/classpath/java/net/DatagramPacket.java | 391 +++++++++++++++++++++++++ 1 file changed, 391 insertions(+) create mode 100644 libjava/classpath/java/net/DatagramPacket.java (limited to 'libjava/classpath/java/net/DatagramPacket.java') diff --git a/libjava/classpath/java/net/DatagramPacket.java b/libjava/classpath/java/net/DatagramPacket.java new file mode 100644 index 000000000..e642f889c --- /dev/null +++ b/libjava/classpath/java/net/DatagramPacket.java @@ -0,0 +1,391 @@ +/* DatagramPacket.java -- Class to model a packet to be sent via UDP + Copyright (C) 1998, 1999, 2000, 2001 Free Software Foundation, Inc. + +This file is part of GNU Classpath. + +GNU Classpath is free software; you can redistribute it and/or modify +it under the terms of the GNU General Public License as published by +the Free Software Foundation; either version 2, or (at your option) +any later version. + +GNU Classpath is distributed in the hope that it will be useful, but +WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +General Public License for more details. + +You should have received a copy of the GNU General Public License +along with GNU Classpath; see the file COPYING. If not, write to the +Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 USA. + +Linking this library statically or dynamically with other modules is +making a combined work based on this library. Thus, the terms and +conditions of the GNU General Public License cover the whole +combination. + +As a special exception, the copyright holders of this library give you +permission to link this library with independent modules to produce an +executable, regardless of the license terms of these independent +modules, and to copy and distribute the resulting executable under +terms of your choice, provided that you also meet, for each linked +independent module, the terms and conditions of the license of that +module. An independent module is a module which is not derived from +or based on this library. If you modify this library, you may extend +this exception to your version of the library, but you are not +obligated to do so. If you do not wish to do so, delete this +exception statement from your version. */ + +package java.net; + + +/* + * Written using on-line Java Platform 1.2 API Specification, as well + * as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998). + * Status: Believed complete and correct. + */ + +/** + * This class models a packet of data that is to be sent across the network + * using a connectionless protocol such as UDP. It contains the data + * to be send, as well as the destination address and port. Note that + * datagram packets can arrive in any order and are not guaranteed to be + * delivered at all. + *

+ * This class can also be used for receiving data from the network. + *

+ * Note that for all method below where the buffer length passed by the + * caller cannot exceed the actually length of the byte array passed as + * the buffer, if this condition is not true, then the method silently + * reduces the length value to maximum allowable value. + * + * Written using on-line Java Platform 1.2 API Specification, as well + * as "The Java Class Libraries", 2nd edition (Addison-Wesley, 1998). + * Status: Believed complete and correct. + * + * @author Warren Levy (warrenl@cygnus.com) + * @author Aarom M. Renn (arenn@urbanophile.com) (Documentation comments) + * @date April 28, 1999. + */ +public final class DatagramPacket +{ + /** + * The data buffer to send + */ + private byte[] buffer; + + /** + * This is the offset into the buffer to start sending from or receiving to. + */ + private int offset; + + /** + * The length of the data buffer to send. + */ + int length; + + /** + * The maximal length of the buffer. + */ + int maxlen; + + /** + * The address to which the packet should be sent or from which it + * was received. + */ + private InetAddress address; + + /** + * The port to which the packet should be sent or from which it was + * was received. + */ + private int port; + + /** + * This method initializes a new instance of DatagramPacket + * which has the specified buffer, offset, and length. + * + * @param buf The buffer for holding the incoming datagram. + * @param offset The offset into the buffer to start writing. + * @param length The maximum number of bytes to read. + * + * @since 1.2 + */ + public DatagramPacket(byte[] buf, int offset, int length) + { + setData(buf, offset, length); + address = null; + port = -1; + } + + /** + * Initializes a new instance of DatagramPacket for + * receiving packets from the network. + * + * @param buf A buffer for storing the returned packet data + * @param length The length of the buffer (must be <= buf.length) + */ + public DatagramPacket(byte[] buf, int length) + { + this(buf, 0, length); + } + + /** + * Initializes a new instance of DatagramPacket for + * transmitting packets across the network. + * + * @param buf A buffer containing the data to send + * @param offset The offset into the buffer to start writing from. + * @param length The length of the buffer (must be <= buf.length) + * @param address The address to send to + * @param port The port to send to + * + * @since 1.2 + */ + public DatagramPacket(byte[] buf, int offset, int length, + InetAddress address, int port) + { + setData(buf, offset, length); + setAddress(address); + setPort(port); + } + + /** + * Initializes a new instance of DatagramPacket for + * transmitting packets across the network. + * + * @param buf A buffer containing the data to send + * @param length The length of the buffer (must be <= buf.length) + * @param address The address to send to + * @param port The port to send to + */ + public DatagramPacket(byte[] buf, int length, InetAddress address, int port) + { + this(buf, 0, length, address, port); + } + + /** + * Initializes a new instance of DatagramPacket for + * transmitting packets across the network. + * + * @param buf A buffer containing the data to send + * @param offset The offset into the buffer to start writing from. + * @param length The length of the buffer (must be <= buf.length) + * @param address The socket address to send to + * + * @exception SocketException If an error occurs + * @exception IllegalArgumentException If address type is not supported + * + * @since 1.4 + */ + public DatagramPacket(byte[] buf, int offset, int length, + SocketAddress address) throws SocketException + { + if (! (address instanceof InetSocketAddress)) + throw new IllegalArgumentException("unsupported address type"); + + InetSocketAddress tmp = (InetSocketAddress) address; + setData(buf, offset, length); + setAddress(tmp.getAddress()); + setPort(tmp.getPort()); + } + + /** + * Initializes a new instance of DatagramPacket for + * transmitting packets across the network. + * + * @param buf A buffer containing the data to send + * @param length The length of the buffer (must be <= buf.length) + * @param address The socket address to send to + * + * @exception SocketException If an error occurs + * @exception IllegalArgumentException If address type is not supported + * + * @since 1.4 + */ + public DatagramPacket(byte[] buf, int length, SocketAddress address) + throws SocketException + { + this(buf, 0, length, address); + } + + /** + * Returns the address that this packet is being sent to or, if it was used + * to receive a packet, the address that is was received from. If the + * constructor that doesn not take an address was used to create this object + * and no packet was actually read into this object, then this method + * returns null. + * + * @return The address for this packet. + */ + public synchronized InetAddress getAddress() + { + return address; + } + + /** + * Returns the port number this packet is being sent to or, if it was used + * to receive a packet, the port that it was received from. If the + * constructor that doesn not take an address was used to create this object + * and no packet was actually read into this object, then this method + * will return 0. + * + * @return The port number for this packet + */ + public synchronized int getPort() + { + return port; + } + + /** + * Returns the data buffer for this packet + * + * @return This packet's data buffer + */ + public synchronized byte[] getData() + { + return buffer; + } + + /** + * This method returns the current offset value into the data buffer + * where data will be sent from. + * + * @return The buffer offset. + * + * @since 1.2 + */ + public synchronized int getOffset() + { + return offset; + } + + /** + * Returns the length of the data in the buffer + * + * @return The length of the data + */ + public synchronized int getLength() + { + return length; + } + + /** + * This sets the address to which the data packet will be transmitted. + * + * @param address The destination address + * + * @since 1.1 + */ + public synchronized void setAddress(InetAddress address) + { + this.address = address; + } + + /** + * This sets the port to which the data packet will be transmitted. + * + * @param port The destination port + * + * @since 1.1 + */ + public synchronized void setPort(int port) + { + if (port < 0 || port > 65535) + throw new IllegalArgumentException("Invalid port: " + port); + + this.port = port; + } + + /** + * Sets the address of the remote host this package will be sent + * + * @param address The socket address of the remove host + * + * @exception IllegalArgumentException If address type is not supported + * + * @since 1.4 + */ + public void setSocketAddress(SocketAddress address) + throws IllegalArgumentException + { + if (address == null) + throw new IllegalArgumentException("address may not be null"); + + InetSocketAddress tmp = (InetSocketAddress) address; + this.address = tmp.getAddress(); + this.port = tmp.getPort(); + } + + /** + * Gets the socket address of the host this packet + * will be sent to/is coming from + * + * @return The socket address of the remote host + * + * @since 1.4 + */ + public SocketAddress getSocketAddress() + { + return new InetSocketAddress(address, port); + } + + /** + * Sets the data buffer for this packet. + * + * @param buf The new buffer for this packet + * + * @exception NullPointerException If the argument is null + * + * @since 1.1 + */ + public void setData(byte[] buf) + { + setData(buf, 0, buf.length); + } + + /** + * This method sets the data buffer for the packet. + * + * @param buf The byte array containing the data for this packet. + * @param offset The offset into the buffer to start reading data from. + * @param length The number of bytes of data in the buffer. + * + * @exception NullPointerException If the argument is null + * + * @since 1.2 + */ + public synchronized void setData(byte[] buf, int offset, int length) + { + // This form of setData must be used if offset is to be changed. + if (buf == null) + throw new NullPointerException("Null buffer"); + if (offset < 0) + throw new IllegalArgumentException("Invalid offset: " + offset); + + buffer = buf; + this.offset = offset; + setLength(length); + } + + /** + * Sets the length of the data in the buffer. + * + * @param length The new length. (Where len <= buf.length) + * + * @exception IllegalArgumentException If the length is negative or + * if the length is greater than the packet's data buffer length + * + * @since 1.1 + */ + public synchronized void setLength(int length) + { + if (length < 0) + throw new IllegalArgumentException("Invalid length: " + length); + if (offset + length > buffer.length) + throw new IllegalArgumentException("Potential buffer overflow - offset: " + + offset + " length: " + length); + + this.length = length; + this.maxlen = length; + } +} -- cgit v1.2.3