package er.extensions.foundation;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import com.webobjects.foundation.NSData;
import com.webobjects.foundation.NSRange;
/**
* This class is uh ... inspired ... by ByteArrayOutputStream, except
* that it gives direct access to the underlying byte buffer for
* performing operations on the buffer without a byte array copying
* penalty.
*
* @author Arthur van Hoff
* @author mschrag
*/
public class ERXRefByteArrayOutputStream extends OutputStream {
/**
* The buffer where data is stored.
*/
protected byte buf[];
/**
* The number of valid bytes in the buffer.
*/
protected int count;
/**
* Creates a new byte array output stream. The buffer capacity is
* initially 32 bytes, though its size increases if necessary.
*/
public ERXRefByteArrayOutputStream() {
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 ERXRefByteArrayOutputStream(int size) {
if (size < 0) {
throw new IllegalArgumentException("Negative initial size: " + size);
}
buf = new byte[size];
}
/**
* Writes the specified byte to this byte array output stream.
*
* @param b the byte to be written.
*/
@Override
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.
*/
@Override
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;
}
/**
* Writes the complete contents of this byte array output stream to
* the specified output stream argument, as if by calling the output
* stream's write method using <code>out.write(buf, 0, count)</code>.
*
* @param out the output stream to which to write the data.
* @exception IOException if an I/O error occurs.
*/
public synchronized void writeTo(OutputStream out) throws IOException {
out.write(buf, 0, count);
}
/**
* Resets the <code>count</code> field of this byte array output
* stream to zero, so that all currently accumulated output in the
* ouput 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()[] {
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
*/
@Override
public String toString() {
return new String(buf, 0, count);
}
/**
* Converts the buffer's contents into a string, translating bytes into
* characters according to the specified character encoding.
*
* @param enc a character-encoding name.
* @return String translated from the buffer's contents.
* @throws UnsupportedEncodingException
* If the named encoding is not supported.
* @since JDK1.1
*/
public String toString(String enc) throws UnsupportedEncodingException {
return new String(buf, 0, count, enc);
}
/**
* Creates a newly allocated string. Its size is the current size of
* the output stream and the valid contents of the buffer have been
* copied into it. Each character <i>c</i> in the resulting string is
* constructed from the corresponding element <i>b</i> in the byte
* array such that:
* <blockquote><pre>
* c == (char)(((hibyte & 0xff) << 8) | (b & 0xff))
* </pre></blockquote>
*
* @deprecated This method does not properly convert bytes into characters.
* As of JDK 1.1, the preferred way to do this is via the
* <code>toString(String enc)</code> method, which takes an encoding-name
* argument, or the <code>toString()</code> method, which uses the
* platform's default character encoding.
*
* @param hibyte the high byte of each resulting Unicode character.
* @return the current contents of the output stream, as a string.
* @see java.io.ByteArrayOutputStream#size()
* @see java.io.ByteArrayOutputStream#toString(String)
* @see java.io.ByteArrayOutputStream#toString()
*/
@Deprecated
public String toString(int hibyte) {
return new String(buf, hibyte, 0, count);
}
/**
* Closing a <tt>ByteArrayOutputStream</tt> has no effect. The methods in
* this class can be called after the stream has been closed without
* generating an <tt>IOException</tt>.
* <p>
*
*/
@Override
public void close() {
}
/**
* Returns the underlying byte buffer for this stream.
*
* @return the underlying byte buffer for this stream
*/
public synchronized byte[] getBuffer() {
return buf;
}
/**
* Returns a no-copy NSData of the byte buffer for this stream.
*
* @return a no-copy NSData of the byte buffer for this stream
*/
public synchronized NSData toNSData() {
return new NSData(buf, new NSRange(0, count), true);
}
}