| /* |
| * Copyright (c) 1996, 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package sun.rmi.transport.proxy; |
| |
| import java.io.*; |
| |
| import sun.rmi.runtime.Log; |
| |
| /** |
| * The HttpInputStream class assists the HttpSendSocket and HttpReceiveSocket |
| * classes by filtering out the header for the message as well as any |
| * data after its proper content length. |
| */ |
| class HttpInputStream extends FilterInputStream { |
| |
| /** bytes remaining to be read from proper content of message */ |
| protected int bytesLeft; |
| |
| /** bytes remaining to be read at time of last mark */ |
| protected int bytesLeftAtMark; |
| |
| /** |
| * Create new filter on a given input stream. |
| * @param in the InputStream to filter from |
| */ |
| public HttpInputStream(InputStream in) throws IOException |
| { |
| super(in); |
| |
| if (in.markSupported()) |
| in.mark(0); // prevent resetting back to old marks |
| |
| // pull out header, looking for content length |
| |
| DataInputStream dis = new DataInputStream(in); |
| String key = "Content-length:".toLowerCase(); |
| boolean contentLengthFound = false; |
| String line; |
| do { |
| line = dis.readLine(); |
| |
| if (RMIMasterSocketFactory.proxyLog.isLoggable(Log.VERBOSE)) { |
| RMIMasterSocketFactory.proxyLog.log(Log.VERBOSE, |
| "received header line: \"" + line + "\""); |
| } |
| |
| if (line == null) |
| throw new EOFException(); |
| |
| if (line.toLowerCase().startsWith(key)) { |
| if (contentLengthFound) { |
| throw new IOException( |
| "Multiple Content-length entries found."); |
| } else { |
| bytesLeft = |
| Integer.parseInt(line.substring(key.length()).trim()); |
| contentLengthFound = true; |
| } |
| } |
| |
| // The idea here is to go past the first blank line. |
| // Some DataInputStream.readLine() documentation specifies that |
| // it does include the line-terminating character(s) in the |
| // returned string, but it actually doesn't, so we'll cover |
| // all cases here... |
| } while ((line.length() != 0) && |
| (line.charAt(0) != '\r') && (line.charAt(0) != '\n')); |
| |
| if (!contentLengthFound || bytesLeft < 0) { |
| // This really shouldn't happen, but if it does, shoud we fail?? |
| // For now, just give up and let a whole lot of bytes through... |
| bytesLeft = Integer.MAX_VALUE; |
| } |
| bytesLeftAtMark = bytesLeft; |
| |
| if (RMIMasterSocketFactory.proxyLog.isLoggable(Log.VERBOSE)) { |
| RMIMasterSocketFactory.proxyLog.log(Log.VERBOSE, |
| "content length: " + bytesLeft); |
| } |
| } |
| |
| /** |
| * Returns the number of bytes that can be read with blocking. |
| * Make sure that this does not exceed the number of bytes remaining |
| * in the proper content of the message. |
| */ |
| public int available() throws IOException |
| { |
| int bytesAvailable = in.available(); |
| if (bytesAvailable > bytesLeft) |
| bytesAvailable = bytesLeft; |
| |
| return bytesAvailable; |
| } |
| |
| /** |
| * Read a byte of data from the stream. Make sure that one is available |
| * from the proper content of the message, else -1 is returned to |
| * indicate to the user that the end of the stream has been reached. |
| */ |
| public int read() throws IOException |
| { |
| if (bytesLeft > 0) { |
| int data = in.read(); |
| if (data != -1) |
| -- bytesLeft; |
| |
| if (RMIMasterSocketFactory.proxyLog.isLoggable(Log.VERBOSE)) { |
| RMIMasterSocketFactory.proxyLog.log(Log.VERBOSE, |
| "received byte: '" + |
| ((data & 0x7F) < ' ' ? " " : String.valueOf((char) data)) + |
| "' " + data); |
| } |
| |
| return data; |
| } |
| else { |
| RMIMasterSocketFactory.proxyLog.log(Log.VERBOSE, |
| "read past content length"); |
| |
| return -1; |
| } |
| } |
| |
| public int read(byte b[], int off, int len) throws IOException |
| { |
| if (bytesLeft == 0 && len > 0) { |
| RMIMasterSocketFactory.proxyLog.log(Log.VERBOSE, |
| "read past content length"); |
| |
| return -1; |
| } |
| if (len > bytesLeft) |
| len = bytesLeft; |
| int bytesRead = in.read(b, off, len); |
| bytesLeft -= bytesRead; |
| |
| if (RMIMasterSocketFactory.proxyLog.isLoggable(Log.VERBOSE)) { |
| RMIMasterSocketFactory.proxyLog.log(Log.VERBOSE, |
| "read " + bytesRead + " bytes, " + bytesLeft + " remaining"); |
| } |
| |
| return bytesRead; |
| } |
| |
| /** |
| * Mark the current position in the stream (for future calls to reset). |
| * Remember where we are within the proper content of the message, so |
| * that a reset method call can recreate our state properly. |
| * @param readlimit how many bytes can be read before mark becomes invalid |
| */ |
| public void mark(int readlimit) |
| { |
| in.mark(readlimit); |
| if (in.markSupported()) |
| bytesLeftAtMark = bytesLeft; |
| } |
| |
| /** |
| * Repositions the stream to the last marked position. Make sure to |
| * adjust our position within the proper content accordingly. |
| */ |
| public void reset() throws IOException |
| { |
| in.reset(); |
| bytesLeft = bytesLeftAtMark; |
| } |
| |
| /** |
| * Skips bytes of the stream. Make sure to adjust our |
| * position within the proper content accordingly. |
| * @param n number of bytes to be skipped |
| */ |
| public long skip(long n) throws IOException |
| { |
| if (n > bytesLeft) |
| n = bytesLeft; |
| long bytesSkipped = in.skip(n); |
| bytesLeft -= bytesSkipped; |
| return bytesSkipped; |
| } |
| } |