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package com.sun.xml.ws.util;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Read/write buffer that stores a sequence of bytes.
*
*
* It works in a way similar to {@link ByteArrayOutputStream} but
* this class works better in the following ways:
*
*
* - no synchronization
*
- offers a {@link #newInputStream()} that creates a new {@link InputStream}
* that won't cause buffer reallocation.
*
- less parameter correctness checking
*
- offers a {@link #write(InputStream)} method that reads the entirety of the
* given {@link InputStream} without using a temporary buffer.
*
*
* @author Kohsuke Kawaguchi
*/
public class ByteArrayBuffer extends OutputStream {
/**
* The buffer where data is stored.
*/
protected byte[] buf;
/**
* The number of valid bytes in the buffer.
*/
private int count;
private static final int CHUNK_SIZE = 4096;
/**
* Creates a new byte array output stream. The buffer capacity is
* initially 32 bytes, though its size increases if necessary.
*/
public ByteArrayBuffer() {
this(32);
}
/**
* Creates a new byte array output stream, with a buffer capacity of
* the specified size, in bytes.
*
* @param size the initial size.
* @throws IllegalArgumentException if size is negative.
*/
public ByteArrayBuffer(int size) {
if (size <= 0)
throw new IllegalArgumentException();
buf = new byte[size];
}
public ByteArrayBuffer(byte[] data) {
this(data,data.length);
}
public ByteArrayBuffer(byte[] data, int length) {
this.buf = data;
this.count = length;
}
/**
* Reads all the data of the given {@link InputStream} and appends them
* into this buffer.
*
* @throws IOException
* if the read operation fails with an {@link IOException}.
*/
public final void write(InputStream in) throws IOException {
while(true) {
int cap = buf.length-count; // the remaining buffer space
int sz = in.read(buf,count,cap);
if(sz<0) return; // hit EOS
count += sz;
if(cap==sz)
ensureCapacity(buf.length*2); // buffer filled up.
}
}
public final void write(int b) {
int newcount = count + 1;
ensureCapacity(newcount);
buf[count] = (byte) b;
count = newcount;
}
public final void write(byte b[], int off, int len) {
int newcount = count + len;
ensureCapacity(newcount);
System.arraycopy(b, off, buf, count, len);
count = newcount;
}
private void ensureCapacity(int newcount) {
if (newcount > buf.length) {
byte newbuf[] = new byte[Math.max(buf.length << 1, newcount)];
System.arraycopy(buf, 0, newbuf, 0, count);
buf = newbuf;
}
}
public final void writeTo(OutputStream out) throws IOException {
// Instead of writing out.write(buf, 0, count)
// Writing it in chunks that would help larger payloads
// Also if out is System.out on windows, it doesn't show on the console
// for larger data.
int remaining = count;
int off = 0;
while(remaining > 0) {
int chunk = (remaining > CHUNK_SIZE) ? CHUNK_SIZE : remaining;
out.write(buf, off, chunk);
remaining -= chunk;
off += chunk;
}
}
public final void reset() {
count = 0;
}
/**
* Gets the copy of exact-size byte[] that represents the written data.
*
*
* Since this method needs to allocate a new byte[], this method will be costly.
*
* @deprecated
* this method causes a buffer reallocation. Use it only when
* you have to.
*/
public final byte[] toByteArray() {
byte newbuf[] = new byte[count];
System.arraycopy(buf, 0, newbuf, 0, count);
return newbuf;
}
public final int size() {
return count;
}
/**
* Gets the underlying buffer that this {@link ByteArrayBuffer} uses.
* It's never small than its {@link #size()}.
*
* Use with caution.
*/
public final byte[] getRawData() {
return buf;
}
public void close() throws IOException {
}
/**
* Creates a new {@link InputStream} that reads from this buffer.
*/
public final InputStream newInputStream() {
return new ByteArrayInputStream(buf,0,count);
}
/**
* Creates a new {@link InputStream} that reads a part of this bfufer.
*/
public final InputStream newInputStream(int start, int length) {
return new ByteArrayInputStream(buf,start,length);
}
/**
* Decodes the contents of this buffer by the default encoding
* and returns it as a string.
*
*
* Meant to aid debugging, but no more.
*/
public String toString() {
return new String(buf, 0, count);
}
}