| /**************************************************************** |
| * 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.james.mime4j.util; |
| |
| |
| /** |
| * A resizable byte array. |
| */ |
| public final class ByteArrayBuffer implements ByteSequence { |
| |
| 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]; |
| } |
| |
| public ByteArrayBuffer(byte[] bytes, boolean dontCopy) { |
| this(bytes, bytes.length, dontCopy); |
| } |
| |
| public ByteArrayBuffer(byte[] bytes, int len, boolean dontCopy) { |
| if (bytes == null) |
| throw new IllegalArgumentException(); |
| if (len < 0 || len > bytes.length) |
| throw new IllegalArgumentException(); |
| |
| if (dontCopy) { |
| this.buffer = bytes; |
| } else { |
| this.buffer = new byte[len]; |
| System.arraycopy(bytes, 0, this.buffer, 0, len); |
| } |
| |
| this.len = len; |
| } |
| |
| 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 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 byte byteAt(int i) { |
| if (i < 0 || i >= this.len) |
| throw new IndexOutOfBoundsException(); |
| |
| return this.buffer[i]; |
| } |
| |
| public int capacity() { |
| return this.buffer.length; |
| } |
| |
| public int length() { |
| return this.len; |
| } |
| |
| public byte[] buffer() { |
| return this.buffer; |
| } |
| |
| public int indexOf(byte b) { |
| return indexOf(b, 0, this.len); |
| } |
| |
| public int indexOf(byte b, int beginIndex, int endIndex) { |
| if (beginIndex < 0) { |
| beginIndex = 0; |
| } |
| if (endIndex > this.len) { |
| endIndex = this.len; |
| } |
| if (beginIndex > endIndex) { |
| return -1; |
| } |
| for (int i = beginIndex; i < endIndex; i++) { |
| if (this.buffer[i] == b) { |
| return i; |
| } |
| } |
| return -1; |
| } |
| |
| 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; |
| } |
| |
| @Override |
| public String toString() { |
| return new String(toByteArray()); |
| } |
| |
| } |