/* * Copyright (c) 1996, 2001, 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)                    ; // what would we want to do in this case??                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;    }}