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/**
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.activemq.util;
import java.io.DataOutput;
import java.io.IOException;
import java.io.OutputStream;
import java.io.UTFDataFormatException;
/**
* Optimized ByteArrayOutputStream
*
*
*/
public final class DataByteArrayOutputStream extends OutputStream implements DataOutput {
private static final int DEFAULT_SIZE = 2048;
private byte buf[];
private int pos;
/**
* 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 DataByteArrayOutputStream(int size) {
if (size < 0) {
throw new IllegalArgumentException("Invalid size: " + size);
}
buf = new byte[size];
}
/**
* Creates a new byte array output stream.
*/
public DataByteArrayOutputStream() {
this(DEFAULT_SIZE);
}
/**
* start using a fresh byte array
*
* @param size
*/
public void restart(int size) {
buf = new byte[size];
pos = 0;
}
/**
* start using a fresh byte array
*/
public void restart() {
restart(DEFAULT_SIZE);
}
/**
* Get a ByteSequence from the stream
*
* @return the byte sequence
*/
public ByteSequence toByteSequence() {
return new ByteSequence(buf, 0, pos);
}
/**
* Writes the specified byte to this byte array output stream.
*
* @param b the byte to be written.
*/
public void write(int b) {
int newcount = pos + 1;
ensureEnoughBuffer(newcount);
buf[pos] = (byte)b;
pos = newcount;
}
/**
* Writes len bytes from the specified byte array starting at
* offset off 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 void write(byte b[], int off, int len) {
if (len == 0) {
return;
}
int newcount = pos + len;
ensureEnoughBuffer(newcount);
System.arraycopy(b, off, buf, pos, len);
pos = newcount;
}
/**
* @return the underlying byte[] buffer
*/
public byte[] getData() {
return buf;
}
/**
* reset the output stream
*/
public void reset() {
pos = 0;
}
/**
* Set the current position for writing
*
* @param offset
*/
public void position(int offset) {
ensureEnoughBuffer(offset);
pos = offset;
}
public int size() {
return pos;
}
public void writeBoolean(boolean v) {
ensureEnoughBuffer(pos + 1);
buf[pos++] = (byte)(v ? 1 : 0);
}
public void writeByte(int v) {
ensureEnoughBuffer(pos + 1);
buf[pos++] = (byte)(v >>> 0);
}
public void writeShort(int v) {
ensureEnoughBuffer(pos + 2);
buf[pos++] = (byte)(v >>> 8);
buf[pos++] = (byte)(v >>> 0);
}
public void writeChar(int v) {
ensureEnoughBuffer(pos + 2);
buf[pos++] = (byte)(v >>> 8);
buf[pos++] = (byte)(v >>> 0);
}
public void writeInt(int v) {
ensureEnoughBuffer(pos + 4);
buf[pos++] = (byte)(v >>> 24);
buf[pos++] = (byte)(v >>> 16);
buf[pos++] = (byte)(v >>> 8);
buf[pos++] = (byte)(v >>> 0);
}
public void writeLong(long v) {
ensureEnoughBuffer(pos + 8);
buf[pos++] = (byte)(v >>> 56);
buf[pos++] = (byte)(v >>> 48);
buf[pos++] = (byte)(v >>> 40);
buf[pos++] = (byte)(v >>> 32);
buf[pos++] = (byte)(v >>> 24);
buf[pos++] = (byte)(v >>> 16);
buf[pos++] = (byte)(v >>> 8);
buf[pos++] = (byte)(v >>> 0);
}
public void writeFloat(float v) throws IOException {
writeInt(Float.floatToIntBits(v));
}
public void writeDouble(double v) throws IOException {
writeLong(Double.doubleToLongBits(v));
}
public void writeBytes(String s) {
int length = s.length();
for (int i = 0; i < length; i++) {
write((byte)s.charAt(i));
}
}
public void writeChars(String s) {
int length = s.length();
for (int i = 0; i < length; i++) {
int c = s.charAt(i);
write((c >>> 8) & 0xFF);
write((c >>> 0) & 0xFF);
}
}
public void writeUTF(String str) throws IOException {
int strlen = str.length();
int encodedsize = 0;
int c;
for (int i = 0; i < strlen; i++) {
c = str.charAt(i);
if ((c >= 0x0001) && (c <= 0x007F)) {
encodedsize++;
} else if (c > 0x07FF) {
encodedsize += 3;
} else {
encodedsize += 2;
}
}
if (encodedsize > 65535) {
throw new UTFDataFormatException("encoded string too long: " + encodedsize + " bytes");
}
ensureEnoughBuffer(pos + encodedsize + 2);
writeShort(encodedsize);
int i = 0;
for (i = 0; i < strlen; i++) {
c = str.charAt(i);
if (!((c >= 0x0001) && (c <= 0x007F))) {
break;
}
buf[pos++] = (byte)c;
}
for (; i < strlen; i++) {
c = str.charAt(i);
if ((c >= 0x0001) && (c <= 0x007F)) {
buf[pos++] = (byte)c;
} else if (c > 0x07FF) {
buf[pos++] = (byte)(0xE0 | ((c >> 12) & 0x0F));
buf[pos++] = (byte)(0x80 | ((c >> 6) & 0x3F));
buf[pos++] = (byte)(0x80 | ((c >> 0) & 0x3F));
} else {
buf[pos++] = (byte)(0xC0 | ((c >> 6) & 0x1F));
buf[pos++] = (byte)(0x80 | ((c >> 0) & 0x3F));
}
}
}
private void ensureEnoughBuffer(int newcount) {
if (newcount > buf.length) {
byte newbuf[] = new byte[Math.max(buf.length << 1, newcount)];
System.arraycopy(buf, 0, newbuf, 0, pos);
buf = newbuf;
}
}
}