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https://gitlab.winehq.org/wine/wine-gecko.git
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345 lines
12 KiB
Java
345 lines
12 KiB
Java
/*
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* ====================================================================
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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* ====================================================================
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*
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* This software consists of voluntary contributions made by many
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* individuals on behalf of the Apache Software Foundation. For more
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* information on the Apache Software Foundation, please see
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* <http://www.apache.org/>.
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*
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*/
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package ch.boye.httpclientandroidlib.util;
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import java.io.Serializable;
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/**
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* A resizable byte array.
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*
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* @since 4.0
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*/
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public final class ByteArrayBuffer implements Serializable {
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private static final long serialVersionUID = 4359112959524048036L;
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private byte[] buffer;
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private int len;
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/**
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* Creates an instance of {@link ByteArrayBuffer} with the given initial
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* capacity.
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*
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* @param capacity the capacity
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*/
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public ByteArrayBuffer(int capacity) {
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super();
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if (capacity < 0) {
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throw new IllegalArgumentException("Buffer capacity may not be negative");
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}
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this.buffer = new byte[capacity];
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}
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private void expand(int newlen) {
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byte newbuffer[] = new byte[Math.max(this.buffer.length << 1, newlen)];
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System.arraycopy(this.buffer, 0, newbuffer, 0, this.len);
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this.buffer = newbuffer;
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}
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/**
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* Appends <code>len</code> bytes to this buffer from the given source
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* array starting at index <code>off</code>. The capacity of the buffer
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* is increased, if necessary, to accommodate all <code>len</code> bytes.
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*
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* @param b the bytes to be appended.
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* @param off the index of the first byte to append.
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* @param len the number of bytes to append.
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* @throws IndexOutOfBoundsException if <code>off</code> if out of
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* range, <code>len</code> is negative, or
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* <code>off</code> + <code>len</code> is out of range.
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*/
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public void append(final byte[] b, int off, int len) {
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if (b == null) {
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return;
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}
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if ((off < 0) || (off > b.length) || (len < 0) ||
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((off + len) < 0) || ((off + len) > b.length)) {
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throw new IndexOutOfBoundsException("off: "+off+" len: "+len+" b.length: "+b.length);
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}
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if (len == 0) {
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return;
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}
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int newlen = this.len + len;
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if (newlen > this.buffer.length) {
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expand(newlen);
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}
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System.arraycopy(b, off, this.buffer, this.len, len);
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this.len = newlen;
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}
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/**
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* Appends <code>b</code> byte to this buffer. The capacity of the buffer
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* is increased, if necessary, to accommodate the additional byte.
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*
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* @param b the byte to be appended.
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*/
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public void append(int b) {
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int newlen = this.len + 1;
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if (newlen > this.buffer.length) {
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expand(newlen);
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}
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this.buffer[this.len] = (byte)b;
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this.len = newlen;
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}
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/**
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* Appends <code>len</code> chars to this buffer from the given source
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* array starting at index <code>off</code>. The capacity of the buffer
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* is increased if necessary to accommodate all <code>len</code> chars.
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* <p>
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* The chars are converted to bytes using simple cast.
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*
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* @param b the chars to be appended.
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* @param off the index of the first char to append.
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* @param len the number of bytes to append.
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* @throws IndexOutOfBoundsException if <code>off</code> if out of
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* range, <code>len</code> is negative, or
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* <code>off</code> + <code>len</code> is out of range.
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*/
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public void append(final char[] b, int off, int len) {
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if (b == null) {
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return;
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}
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if ((off < 0) || (off > b.length) || (len < 0) ||
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((off + len) < 0) || ((off + len) > b.length)) {
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throw new IndexOutOfBoundsException("off: "+off+" len: "+len+" b.length: "+b.length);
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}
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if (len == 0) {
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return;
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}
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int oldlen = this.len;
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int newlen = oldlen + len;
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if (newlen > this.buffer.length) {
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expand(newlen);
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}
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for (int i1 = off, i2 = oldlen; i2 < newlen; i1++, i2++) {
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this.buffer[i2] = (byte) b[i1];
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}
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this.len = newlen;
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}
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/**
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* Appends <code>len</code> chars to this buffer from the given source
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* char array buffer starting at index <code>off</code>. The capacity
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* of the buffer is increased if necessary to accommodate all
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* <code>len</code> chars.
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* <p>
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* The chars are converted to bytes using simple cast.
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*
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* @param b the chars to be appended.
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* @param off the index of the first char to append.
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* @param len the number of bytes to append.
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* @throws IndexOutOfBoundsException if <code>off</code> if out of
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* range, <code>len</code> is negative, or
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* <code>off</code> + <code>len</code> is out of range.
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*/
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public void append(final CharArrayBuffer b, int off, int len) {
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if (b == null) {
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return;
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}
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append(b.buffer(), off, len);
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}
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/**
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* Clears content of the buffer. The underlying byte array is not resized.
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*/
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public void clear() {
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this.len = 0;
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}
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/**
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* Converts the content of this buffer to an array of bytes.
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*
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* @return byte array
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*/
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public byte[] toByteArray() {
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byte[] b = new byte[this.len];
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if (this.len > 0) {
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System.arraycopy(this.buffer, 0, b, 0, this.len);
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}
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return b;
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}
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/**
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* Returns the <code>byte</code> value in this buffer at the specified
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* index. The index argument must be greater than or equal to
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* <code>0</code>, and less than the length of this buffer.
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*
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* @param i the index of the desired byte value.
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* @return the byte value at the specified index.
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* @throws IndexOutOfBoundsException if <code>index</code> is
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* negative or greater than or equal to {@link #length()}.
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*/
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public int byteAt(int i) {
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return this.buffer[i];
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}
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/**
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* Returns the current capacity. The capacity is the amount of storage
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* available for newly appended bytes, beyond which an allocation
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* will occur.
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*
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* @return the current capacity
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*/
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public int capacity() {
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return this.buffer.length;
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}
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/**
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* Returns the length of the buffer (byte count).
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*
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* @return the length of the buffer
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*/
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public int length() {
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return this.len;
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}
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/**
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* Ensures that the capacity is at least equal to the specified minimum.
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* If the current capacity is less than the argument, then a new internal
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* array is allocated with greater capacity. If the <code>required</code>
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* argument is non-positive, this method takes no action.
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*
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* @param required the minimum required capacity.
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*
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* @since 4.1
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*/
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public void ensureCapacity(int required) {
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if (required <= 0) {
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return;
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}
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int available = this.buffer.length - this.len;
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if (required > available) {
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expand(this.len + required);
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}
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}
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/**
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* Returns reference to the underlying byte array.
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*
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* @return the byte array.
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*/
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public byte[] buffer() {
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return this.buffer;
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}
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/**
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* Sets the length of the buffer. The new length value is expected to be
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* less than the current capacity and greater than or equal to
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* <code>0</code>.
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*
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* @param len the new length
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* @throws IndexOutOfBoundsException if the
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* <code>len</code> argument is greater than the current
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* capacity of the buffer or less than <code>0</code>.
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*/
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public void setLength(int len) {
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if (len < 0 || len > this.buffer.length) {
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throw new IndexOutOfBoundsException("len: "+len+" < 0 or > buffer len: "+this.buffer.length);
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}
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this.len = len;
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}
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/**
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* Returns <code>true</code> if this buffer is empty, that is, its
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* {@link #length()} is equal to <code>0</code>.
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* @return <code>true</code> if this buffer is empty, <code>false</code>
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* otherwise.
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*/
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public boolean isEmpty() {
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return this.len == 0;
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}
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/**
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* Returns <code>true</code> if this buffer is full, that is, its
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* {@link #length()} is equal to its {@link #capacity()}.
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* @return <code>true</code> if this buffer is full, <code>false</code>
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* otherwise.
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*/
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public boolean isFull() {
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return this.len == this.buffer.length;
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}
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/**
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* Returns the index within this buffer of the first occurrence of the
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* specified byte, starting the search at the specified
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* <code>beginIndex</code> and finishing at <code>endIndex</code>.
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* If no such byte occurs in this buffer within the specified bounds,
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* <code>-1</code> is returned.
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* <p>
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* There is no restriction on the value of <code>beginIndex</code> and
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* <code>endIndex</code>. If <code>beginIndex</code> is negative,
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* it has the same effect as if it were zero. If <code>endIndex</code> is
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* greater than {@link #length()}, it has the same effect as if it were
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* {@link #length()}. If the <code>beginIndex</code> is greater than
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* the <code>endIndex</code>, <code>-1</code> is returned.
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*
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* @param b the byte to search for.
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* @param beginIndex the index to start the search from.
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* @param endIndex the index to finish the search at.
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* @return the index of the first occurrence of the byte in the buffer
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* within the given bounds, or <code>-1</code> if the byte does
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* not occur.
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*
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* @since 4.1
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*/
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public int indexOf(byte b, int beginIndex, int endIndex) {
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if (beginIndex < 0) {
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beginIndex = 0;
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}
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if (endIndex > this.len) {
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endIndex = this.len;
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}
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if (beginIndex > endIndex) {
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return -1;
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}
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for (int i = beginIndex; i < endIndex; i++) {
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if (this.buffer[i] == b) {
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return i;
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}
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}
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return -1;
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}
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/**
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* Returns the index within this buffer of the first occurrence of the
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* specified byte, starting the search at <code>0</code> and finishing
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* at {@link #length()}. If no such byte occurs in this buffer within
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* those bounds, <code>-1</code> is returned.
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*
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* @param b the byte to search for.
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* @return the index of the first occurrence of the byte in the
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* buffer, or <code>-1</code> if the byte does not occur.
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*
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* @since 4.1
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*/
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public int indexOf(byte b) {
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return indexOf(b, 0, this.len);
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}
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}
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