com.googlecode.gwt.test.rpc.FastByteArrayOutputStream Maven / Gradle / Ivy
package com.googlecode.gwt.test.rpc;
import java.io.InputStream;
import java.io.OutputStream;
/**
* ByteArrayOutputStream implementation that doesn't synchronize methods and doesn't copy the data
* on toByteArray().
*/
class FastByteArrayOutputStream extends OutputStream {
/**
* Buffer and size
*/
protected byte[] buf = null;
protected int size = 0;
/**
* Constructs a stream with buffer capacity size 5K
*/
public FastByteArrayOutputStream() {
this(5 * 1024);
}
/**
* Constructs a stream with the given initial size
*/
public FastByteArrayOutputStream(int initSize) {
this.size = 0;
this.buf = new byte[initSize];
}
/**
* Returns the byte array containing the written data. Note that this array will almost always be
* larger than the amount of data actually written.
*/
public byte[] getByteArray() {
return buf;
}
/**
* Returns a ByteArrayInputStream for reading back the written data
*/
public InputStream getInputStream() {
return new FastByteArrayInputStream(buf, size);
}
public int getSize() {
return size;
}
public void reset() {
size = 0;
}
public final void write(byte b[]) {
verifyBufferSize(size + b.length);
System.arraycopy(b, 0, buf, size, b.length);
size += b.length;
}
public final void write(byte b[], int off, int len) {
verifyBufferSize(size + len);
System.arraycopy(b, off, buf, size, len);
size += len;
}
public final void write(int b) {
verifyBufferSize(size + 1);
buf[size++] = (byte) b;
}
/**
* Ensures that we have a large enough buffer for the given size.
*/
private void verifyBufferSize(int sz) {
if (sz > buf.length) {
byte[] old = buf;
buf = new byte[Math.max(sz, 2 * buf.length)];
System.arraycopy(old, 0, buf, 0, old.length);
old = null;
}
}
}