mq5.0-source.main.http-tunnel.tunnel.src.main.java.com.sun.messaging.jmq.httptunnel.tunnel.HttpTunnelInputStream Maven / Gradle / Ivy
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/*
* @(#)HttpTunnelInputStream.java 1.3 06/28/07
*/
package com.sun.messaging.jmq.httptunnel.tunnel;
import java.io.*;
/**
* Provides an input stream for reading data from an HTTP tunnel
* connection.
*/
public class HttpTunnelInputStream extends InputStream {
private HttpTunnelConnection conn = null;
private byte[] singlebyte = new byte[1];
/**
* Creates an InputStream for a HttpTunnelSocket.
*/
protected HttpTunnelInputStream(HttpTunnelConnection conn) {
this.conn = conn;
}
/**
* Reads the next byte of data from the input stream. The value byte is
* returned as an int in the range 0 to
* 255. If no byte is available because the end of the stream
* has been reached, the value -1 is returned. This method
* blocks until input data is available, the end of the stream is detected,
* or an exception is thrown.
*
* @return the next byte of data, or -1 if the end of the
* stream is reached.
* @exception IOException if an I/O error occurs.
*/
public synchronized int read() throws IOException {
int n = conn.readData(singlebyte);
if (n == 0)
return -1;
return (((int) singlebyte[0]) & 0xff);
}
/**
* Reads up to len bytes of data from the input stream into
* an array of bytes. An attempt is made to read as many as
* len bytes, but a smaller number may be read, possibly
* zero. The number of bytes actually read is returned as an integer.
*
* @param b the buffer into which the data is read.
* @param off the start offset in array b
* at which the data is written.
* @param len the maximum number of bytes to read.
* @return the total number of bytes read into the buffer, or
* -1 if there is no more data because the end of
* the stream has been reached.
* @exception IOException if an I/O error occurs.
*/
public synchronized int read(byte b[], int off, int len)
throws IOException {
int n = conn.readData(b, off, len);
if (n == 0)
return -1;
return n;
}
/**
* Skips over and discards n bytes of data from this input
* stream. The skip method may, for a variety of reasons, end
* up skipping over some smaller number of bytes, possibly 0.
* This may result from any of a number of conditions; reaching end of file
* before n bytes have been skipped is only one possibility.
* The actual number of bytes skipped is returned. If n is
* negative, no bytes are skipped.
*
* @param n the number of bytes to be skipped.
* @return the actual number of bytes skipped.
* @exception IOException if an I/O error occurs.
*/
public synchronized long skip(long n) throws IOException {
int skipped = 0;
int ret;
while (skipped < n) {
try {
ret = conn.readData(null, 0, (int) n - skipped);
}
catch (IOException e) {
if (skipped == 0)
throw e;
else
break;
}
if (ret == 0)
break;
skipped += ret;
}
return skipped;
}
/**
* Returns the number of bytes that can be read (or skipped over) from
* this input stream without blocking by the next caller of a method for
* this input stream. The next caller might be the same thread or or
* another thread.
*
* @return the number of bytes that can be read from this input stream
* without blocking.
* @exception IOException if an I/O error occurs.
*/
public synchronized int available() throws IOException {
return conn.available();
}
/**
* Closes this input stream and releases any system resources associated
* with the stream.
*
* @exception IOException if an I/O error occurs.
*/
public synchronized void close() throws IOException {
}
}
/*
* EOF
*/