| /* |
| * $HeadURL: http://svn.apache.org/repos/asf/httpcomponents/httpcore/trunk/module-main/src/main/java/org/apache/http/util/ByteArrayBuffer.java $ |
| * $Revision: 496070 $ |
| * $Date: 2007-01-14 04:18:34 -0800 (Sun, 14 Jan 2007) $ |
| * |
| * ==================================================================== |
| * 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. |
| * ==================================================================== |
| * |
| * This software consists of voluntary contributions made by many |
| * individuals on behalf of the Apache Software Foundation. For more |
| * information on the Apache Software Foundation, please see |
| * <http://www.apache.org/>. |
| * |
| */ |
| |
| package org.apache.http.util; |
| |
| /** |
| * A resizable byte array. |
| * |
| * @author <a href="mailto:oleg@ural.ru">Oleg Kalnichevski</a> |
| * |
| * @version $Revision: 496070 $ |
| * |
| * @since 4.0 |
| */ |
| public final class ByteArrayBuffer { |
| |
| private byte[] buffer; |
| private int len; |
| |
| public ByteArrayBuffer(int capacity) { |
| super(); |
| if (capacity < 0) { |
| throw new IllegalArgumentException("Buffer capacity may not be negative"); |
| } |
| this.buffer = new byte[capacity]; |
| } |
| |
| private void expand(int newlen) { |
| byte newbuffer[] = new byte[Math.max(this.buffer.length << 1, newlen)]; |
| System.arraycopy(this.buffer, 0, newbuffer, 0, this.len); |
| this.buffer = newbuffer; |
| } |
| |
| public void append(final byte[] b, int off, int len) { |
| if (b == null) { |
| return; |
| } |
| if ((off < 0) || (off > b.length) || (len < 0) || |
| ((off + len) < 0) || ((off + len) > b.length)) { |
| throw new IndexOutOfBoundsException(); |
| } |
| if (len == 0) { |
| return; |
| } |
| int newlen = this.len + len; |
| if (newlen > this.buffer.length) { |
| expand(newlen); |
| } |
| System.arraycopy(b, off, this.buffer, this.len, len); |
| this.len = newlen; |
| } |
| |
| public void append(int b) { |
| int newlen = this.len + 1; |
| if (newlen > this.buffer.length) { |
| expand(newlen); |
| } |
| this.buffer[this.len] = (byte)b; |
| this.len = newlen; |
| } |
| |
| public void append(final char[] b, int off, int len) { |
| if (b == null) { |
| return; |
| } |
| if ((off < 0) || (off > b.length) || (len < 0) || |
| ((off + len) < 0) || ((off + len) > b.length)) { |
| throw new IndexOutOfBoundsException(); |
| } |
| if (len == 0) { |
| return; |
| } |
| int oldlen = this.len; |
| int newlen = oldlen + len; |
| if (newlen > this.buffer.length) { |
| expand(newlen); |
| } |
| for (int i1 = off, i2 = oldlen; i2 < newlen; i1++, i2++) { |
| this.buffer[i2] = (byte) b[i1]; |
| } |
| this.len = newlen; |
| } |
| |
| public void append(final CharArrayBuffer b, int off, int len) { |
| if (b == null) { |
| return; |
| } |
| append(b.buffer(), off, len); |
| } |
| |
| public void clear() { |
| this.len = 0; |
| } |
| |
| public byte[] toByteArray() { |
| byte[] b = new byte[this.len]; |
| if (this.len > 0) { |
| System.arraycopy(this.buffer, 0, b, 0, this.len); |
| } |
| return b; |
| } |
| |
| public int byteAt(int i) { |
| return this.buffer[i]; |
| } |
| |
| public int capacity() { |
| return this.buffer.length; |
| } |
| |
| public int length() { |
| return this.len; |
| } |
| |
| public byte[] buffer() { |
| return this.buffer; |
| } |
| |
| public void setLength(int len) { |
| if (len < 0 || len > this.buffer.length) { |
| throw new IndexOutOfBoundsException(); |
| } |
| this.len = len; |
| } |
| |
| public boolean isEmpty() { |
| return this.len == 0; |
| } |
| |
| public boolean isFull() { |
| return this.len == this.buffer.length; |
| } |
| |
| } |