/*
*
*
* Copyright 1990-2009 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER
*
* This program 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.
*
* This program 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 at /legal/license.txt).
*
* 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 Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 or visit www.sun.com if you need additional
* information or have any questions.
*/
package java.io;
//import com.sun.cldchi.jvm.JVM;
/**
* This class implements an output stream in which the data is
* written into a byte array. The buffer automatically grows as data
* is written to it.
* The data can be retrieved using <code>toByteArray()</code> and
* <code>toString()</code>.
* @version 12/17/01 (CLDC 1.1)
* @since JDK1.0, CLDC 1.0
*/
public class ByteArrayOutputStream extends OutputStream {
/**
* The buffer where data is stored.
*/
protected byte buf[];
/**
* The number of valid bytes in the buffer.
*/
protected int count;
/**
* Flag indicating whether the stream has been closed.
*/
private boolean isClosed = false;
/**
* Creates a new byte array output stream. The buffer capacity is
* initially 32 bytes, though its size increases if necessary.
*/
public ByteArrayOutputStream() {
this(32);
}
/**
* Creates a new byte array output stream, with a buffer capacity of
* the specified size, in bytes.
*
* @param size the initial size.
* @exception IllegalArgumentException if size is negative.
*/
public ByteArrayOutputStream(int size) {
if (size < 0) {
throw new IllegalArgumentException(
/* #ifdef VERBOSE_EXCEPTIONS */
/// skipped "Negative initial size: " + size
/* #endif */
);
}
buf = new byte[size];
}
/**
* Writes the specified byte to this byte array output stream.
*
* @param b the byte to be written.
*/
public synchronized void write(int b) {
int newcount = count + 1;
if (newcount > buf.length) {
byte newbuf[] = new byte[Math.max(buf.length << 1, newcount)];
System.arraycopy(buf, 0, newbuf, 0, count);
buf = newbuf;
}
buf[count] = (byte)b;
count = newcount;
}
/**
* Writes <code>len</code> bytes from the specified byte array
* starting at offset <code>off</code> to this byte array output stream.
*
* @param b the data.
* @param off the start offset in the data.
* @param len the number of bytes to write.
*/
public synchronized void write(byte b[], int off, int len) {
if ((off < 0) || (off > b.length) || (len < 0) ||
((off + len) > b.length) || ((off + len) < 0)) {
throw new IndexOutOfBoundsException();
} else if (len == 0) {
return;
}
int newcount = count + len;
if (newcount > buf.length) {
byte newbuf[] = new byte[Math.max(buf.length << 1, newcount)];
System.arraycopy(buf, 0, newbuf, 0, count);
buf = newbuf;
}
System.arraycopy(b, off, buf, count, len);
count = newcount;
}
/**
* Resets the <code>count</code> field of this byte array output
* stream to zero, so that all currently accumulated output in the
* output stream is discarded. The output stream can be used again,
* reusing the already allocated buffer space.
*
* @see java.io.ByteArrayInputStream#count
*/
public synchronized void reset() {
count = 0;
}
/**
* Creates a newly allocated byte array. Its size is the current
* size of this output stream and the valid contents of the buffer
* have been copied into it.
*
* @return the current contents of this output stream, as a byte array.
* @see java.io.ByteArrayOutputStream#size()
*/
public synchronized byte toByteArray()[] {
if (isClosed && buf.length == count) {
return buf;
} else {
byte newbuf[] = new byte[count];
System.arraycopy(buf, 0, newbuf, 0, count);
return newbuf;
}
}
/**
* Returns the current size of the buffer.
*
* @return the value of the <code>count</code> field, which is the number
* of valid bytes in this output stream.
* @see java.io.ByteArrayOutputStream#count
*/
public int size() {
return count;
}
/**
* Converts the buffer's contents into a string, translating bytes into
* characters according to the platform's default character encoding.
*
* @return String translated from the buffer's contents.
* @since JDK1.1
*/
public String toString() {
return new String(buf, 0, count);
}
/**
* Closes this output stream and releases any system resources
* associated with this stream. A closed stream cannot perform
* output operations and cannot be reopened.
* <p>
*
*/
public synchronized void close() throws IOException {
isClosed = true;
}
}