/* * Copyright (c) 1997, 1999, 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.log;import java.io.*;publicclass LogInputStream extends InputStream { private InputStream in; private int length; /** * Creates a log input file with the specified system dependent * file descriptor. * @param fd the system dependent file descriptor * @param length the total number of bytes allowed to be read * @exception IOException If an I/O error has occurred. */ public LogInputStream(InputStream in, int length) throws IOException { this.in = in; this.length = length; } /** * Reads a byte of data. This method will block if no input is * available. * @return the byte read, or -1 if the end of the log or end of the * stream is reached. * @exception IOException If an I/O error has occurred. */ public int read() throws IOException { if (length == 0) return -1; int c = in.read(); length = (c != -1) ? length - 1 : 0; return c; } /** * Reads data into an array of bytes. * This method blocks until some input is available. * @param b the buffer into which the data is read * @return the actual number of bytes read, or -1 if the end of the log * or end of the stream is reached. * @exception IOException If an I/O error has occurred. */ public int read(byte b[]) throws IOException { return read(b, 0, b.length); } /** * Reads data into an array of bytes. * This method blocks until some input is available. * @param b the buffer into which the data is read * @param off the start offset of the data * @param len the maximum number of bytes read * @return the actual number of bytes read, or -1 if the end of the log or * end of the stream is reached. * @exception IOException If an I/O error has occurred. */ public int read(byte b[], int off, int len) throws IOException { if (length == 0) return -1; len = (length < len) ? length : len; int n = in.read(b, off, len); length = (n != -1) ? length - n : 0; return n; } /** * Skips n bytes of input. * @param n the number of bytes to be skipped * @return the actual number of bytes skipped. * @exception IOException If an I/O error has occurred. */ public long skip(long n) throws IOException { if (n > Integer.MAX_VALUE) throw new IOException("Too many bytes to skip - " + n); if (length == 0) return 0; n = (length < n) ? length : n; n = in.skip(n); length -= n; return n; } /** * Returns the number of bytes that can be read without blocking. * @return the number of available bytes, which is initially * equal to the file size. */ public int available() throws IOException { int avail = in.available(); return (length < avail) ? length : avail; } /** * Closes the input stream. No further input can be read. * the stream. */ public void close() { length = 0; } /** * Closes the stream when garbage is collected. */ protected void finalize() throws IOException { close(); }}
/*
* Copyright (c) 1997, 1999, 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.log;
import java.io.*;
public
class LogInputStream extends InputStream {
private InputStream in;
private int length;
/**
* Creates a log input file with the specified system dependent
* file descriptor.
* @param fd the system dependent file descriptor
* @param length the total number of bytes allowed to be read
* @exception IOException If an I/O error has occurred.
*/
public LogInputStream(InputStream in, int length) throws IOException {
this.in = in;
this.length = length;
}
/**
* Reads a byte of data. This method will block if no input is
* available.
* @return the byte read, or -1 if the end of the log or end of the
* stream is reached.
* @exception IOException If an I/O error has occurred.
*/
public int read() throws IOException {
if (length == 0)
return -1;
int c = in.read();
length = (c != -1) ? length - 1 : 0;
return c;
}
/**
* Reads data into an array of bytes.
* This method blocks until some input is available.
* @param b the buffer into which the data is read
* @return the actual number of bytes read, or -1 if the end of the log
* or end of the stream is reached.
* @exception IOException If an I/O error has occurred.
*/
public int read(byte b[]) throws IOException {
return read(b, 0, b.length);
}
/**
* Reads data into an array of bytes.
* This method blocks until some input is available.
* @param b the buffer into which the data is read
* @param off the start offset of the data
* @param len the maximum number of bytes read
* @return the actual number of bytes read, or -1 if the end of the log or
* end of the stream is reached.
* @exception IOException If an I/O error has occurred.
*/
public int read(byte b[], int off, int len) throws IOException {
if (length == 0)
return -1;
len = (length < len) ? length : len;
int n = in.read(b, off, len);
length = (n != -1) ? length - n : 0;
return n;
}
/**
* Skips n bytes of input.
* @param n the number of bytes to be skipped
* @return the actual number of bytes skipped.
* @exception IOException If an I/O error has occurred.
*/
public long skip(long n) throws IOException {
if (n > Integer.MAX_VALUE)
throw new IOException("Too many bytes to skip - " + n);
if (length == 0)
return 0;
n = (length < n) ? length : n;
n = in.skip(n);
length -= n;
return n;
}
/**
* Returns the number of bytes that can be read without blocking.
* @return the number of available bytes, which is initially
* equal to the file size.
*/
public int available() throws IOException {
int avail = in.available();
return (length < avail) ? length : avail;
}
/**
* Closes the input stream. No further input can be read.
* the stream.
*/
public void close() {
length = 0;
}
/**
* Closes the stream when garbage is collected.
*/
protected void finalize() throws IOException {
close();
}
}