mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-07-31 06:29:45 +00:00
348 lines
12 KiB
Java
348 lines
12 KiB
Java
/*
|
|
* ====================================================================
|
|
* 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 ch.boye.httpclientandroidlib.util;
|
|
|
|
import java.io.Serializable;
|
|
|
|
import ch.boye.httpclientandroidlib.annotation.NotThreadSafe;
|
|
|
|
/**
|
|
* A resizable byte array.
|
|
*
|
|
* @since 4.0
|
|
*/
|
|
@NotThreadSafe
|
|
public final class ByteArrayBuffer implements Serializable {
|
|
|
|
private static final long serialVersionUID = 4359112959524048036L;
|
|
|
|
private byte[] buffer;
|
|
private int len;
|
|
|
|
/**
|
|
* Creates an instance of {@link ByteArrayBuffer} with the given initial
|
|
* capacity.
|
|
*
|
|
* @param capacity the capacity
|
|
*/
|
|
public ByteArrayBuffer(final int capacity) {
|
|
super();
|
|
Args.notNegative(capacity, "Buffer capacity");
|
|
this.buffer = new byte[capacity];
|
|
}
|
|
|
|
private void expand(final int newlen) {
|
|
final byte newbuffer[] = new byte[Math.max(this.buffer.length << 1, newlen)];
|
|
System.arraycopy(this.buffer, 0, newbuffer, 0, this.len);
|
|
this.buffer = newbuffer;
|
|
}
|
|
|
|
/**
|
|
* Appends <code>len</code> bytes to this buffer from the given source
|
|
* array starting at index <code>off</code>. The capacity of the buffer
|
|
* is increased, if necessary, to accommodate all <code>len</code> bytes.
|
|
*
|
|
* @param b the bytes to be appended.
|
|
* @param off the index of the first byte to append.
|
|
* @param len the number of bytes to append.
|
|
* @throws IndexOutOfBoundsException if <code>off</code> if out of
|
|
* range, <code>len</code> is negative, or
|
|
* <code>off</code> + <code>len</code> is out of range.
|
|
*/
|
|
public void append(final byte[] b, final int off, final int len) {
|
|
if (b == null) {
|
|
return;
|
|
}
|
|
if ((off < 0) || (off > b.length) || (len < 0) ||
|
|
((off + len) < 0) || ((off + len) > b.length)) {
|
|
throw new IndexOutOfBoundsException("off: "+off+" len: "+len+" b.length: "+b.length);
|
|
}
|
|
if (len == 0) {
|
|
return;
|
|
}
|
|
final int newlen = this.len + len;
|
|
if (newlen > this.buffer.length) {
|
|
expand(newlen);
|
|
}
|
|
System.arraycopy(b, off, this.buffer, this.len, len);
|
|
this.len = newlen;
|
|
}
|
|
|
|
/**
|
|
* Appends <code>b</code> byte to this buffer. The capacity of the buffer
|
|
* is increased, if necessary, to accommodate the additional byte.
|
|
*
|
|
* @param b the byte to be appended.
|
|
*/
|
|
public void append(final int b) {
|
|
final int newlen = this.len + 1;
|
|
if (newlen > this.buffer.length) {
|
|
expand(newlen);
|
|
}
|
|
this.buffer[this.len] = (byte)b;
|
|
this.len = newlen;
|
|
}
|
|
|
|
/**
|
|
* Appends <code>len</code> chars to this buffer from the given source
|
|
* array starting at index <code>off</code>. The capacity of the buffer
|
|
* is increased if necessary to accommodate all <code>len</code> chars.
|
|
* <p>
|
|
* The chars are converted to bytes using simple cast.
|
|
*
|
|
* @param b the chars to be appended.
|
|
* @param off the index of the first char to append.
|
|
* @param len the number of bytes to append.
|
|
* @throws IndexOutOfBoundsException if <code>off</code> if out of
|
|
* range, <code>len</code> is negative, or
|
|
* <code>off</code> + <code>len</code> is out of range.
|
|
*/
|
|
public void append(final char[] b, final int off, final int len) {
|
|
if (b == null) {
|
|
return;
|
|
}
|
|
if ((off < 0) || (off > b.length) || (len < 0) ||
|
|
((off + len) < 0) || ((off + len) > b.length)) {
|
|
throw new IndexOutOfBoundsException("off: "+off+" len: "+len+" b.length: "+b.length);
|
|
}
|
|
if (len == 0) {
|
|
return;
|
|
}
|
|
final int oldlen = this.len;
|
|
final 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;
|
|
}
|
|
|
|
/**
|
|
* Appends <code>len</code> chars to this buffer from the given source
|
|
* char array buffer starting at index <code>off</code>. The capacity
|
|
* of the buffer is increased if necessary to accommodate all
|
|
* <code>len</code> chars.
|
|
* <p>
|
|
* The chars are converted to bytes using simple cast.
|
|
*
|
|
* @param b the chars to be appended.
|
|
* @param off the index of the first char to append.
|
|
* @param len the number of bytes to append.
|
|
* @throws IndexOutOfBoundsException if <code>off</code> if out of
|
|
* range, <code>len</code> is negative, or
|
|
* <code>off</code> + <code>len</code> is out of range.
|
|
*/
|
|
public void append(final CharArrayBuffer b, final int off, final int len) {
|
|
if (b == null) {
|
|
return;
|
|
}
|
|
append(b.buffer(), off, len);
|
|
}
|
|
|
|
/**
|
|
* Clears content of the buffer. The underlying byte array is not resized.
|
|
*/
|
|
public void clear() {
|
|
this.len = 0;
|
|
}
|
|
|
|
/**
|
|
* Converts the content of this buffer to an array of bytes.
|
|
*
|
|
* @return byte array
|
|
*/
|
|
public byte[] toByteArray() {
|
|
final byte[] b = new byte[this.len];
|
|
if (this.len > 0) {
|
|
System.arraycopy(this.buffer, 0, b, 0, this.len);
|
|
}
|
|
return b;
|
|
}
|
|
|
|
/**
|
|
* Returns the <code>byte</code> value in this buffer at the specified
|
|
* index. The index argument must be greater than or equal to
|
|
* <code>0</code>, and less than the length of this buffer.
|
|
*
|
|
* @param i the index of the desired byte value.
|
|
* @return the byte value at the specified index.
|
|
* @throws IndexOutOfBoundsException if <code>index</code> is
|
|
* negative or greater than or equal to {@link #length()}.
|
|
*/
|
|
public int byteAt(final int i) {
|
|
return this.buffer[i];
|
|
}
|
|
|
|
/**
|
|
* Returns the current capacity. The capacity is the amount of storage
|
|
* available for newly appended bytes, beyond which an allocation
|
|
* will occur.
|
|
*
|
|
* @return the current capacity
|
|
*/
|
|
public int capacity() {
|
|
return this.buffer.length;
|
|
}
|
|
|
|
/**
|
|
* Returns the length of the buffer (byte count).
|
|
*
|
|
* @return the length of the buffer
|
|
*/
|
|
public int length() {
|
|
return this.len;
|
|
}
|
|
|
|
/**
|
|
* Ensures that the capacity is at least equal to the specified minimum.
|
|
* If the current capacity is less than the argument, then a new internal
|
|
* array is allocated with greater capacity. If the <code>required</code>
|
|
* argument is non-positive, this method takes no action.
|
|
*
|
|
* @param required the minimum required capacity.
|
|
*
|
|
* @since 4.1
|
|
*/
|
|
public void ensureCapacity(final int required) {
|
|
if (required <= 0) {
|
|
return;
|
|
}
|
|
final int available = this.buffer.length - this.len;
|
|
if (required > available) {
|
|
expand(this.len + required);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Returns reference to the underlying byte array.
|
|
*
|
|
* @return the byte array.
|
|
*/
|
|
public byte[] buffer() {
|
|
return this.buffer;
|
|
}
|
|
|
|
/**
|
|
* Sets the length of the buffer. The new length value is expected to be
|
|
* less than the current capacity and greater than or equal to
|
|
* <code>0</code>.
|
|
*
|
|
* @param len the new length
|
|
* @throws IndexOutOfBoundsException if the
|
|
* <code>len</code> argument is greater than the current
|
|
* capacity of the buffer or less than <code>0</code>.
|
|
*/
|
|
public void setLength(final int len) {
|
|
if (len < 0 || len > this.buffer.length) {
|
|
throw new IndexOutOfBoundsException("len: "+len+" < 0 or > buffer len: "+this.buffer.length);
|
|
}
|
|
this.len = len;
|
|
}
|
|
|
|
/**
|
|
* Returns <code>true</code> if this buffer is empty, that is, its
|
|
* {@link #length()} is equal to <code>0</code>.
|
|
* @return <code>true</code> if this buffer is empty, <code>false</code>
|
|
* otherwise.
|
|
*/
|
|
public boolean isEmpty() {
|
|
return this.len == 0;
|
|
}
|
|
|
|
/**
|
|
* Returns <code>true</code> if this buffer is full, that is, its
|
|
* {@link #length()} is equal to its {@link #capacity()}.
|
|
* @return <code>true</code> if this buffer is full, <code>false</code>
|
|
* otherwise.
|
|
*/
|
|
public boolean isFull() {
|
|
return this.len == this.buffer.length;
|
|
}
|
|
|
|
/**
|
|
* Returns the index within this buffer of the first occurrence of the
|
|
* specified byte, starting the search at the specified
|
|
* <code>beginIndex</code> and finishing at <code>endIndex</code>.
|
|
* If no such byte occurs in this buffer within the specified bounds,
|
|
* <code>-1</code> is returned.
|
|
* <p>
|
|
* There is no restriction on the value of <code>beginIndex</code> and
|
|
* <code>endIndex</code>. If <code>beginIndex</code> is negative,
|
|
* it has the same effect as if it were zero. If <code>endIndex</code> is
|
|
* greater than {@link #length()}, it has the same effect as if it were
|
|
* {@link #length()}. If the <code>beginIndex</code> is greater than
|
|
* the <code>endIndex</code>, <code>-1</code> is returned.
|
|
*
|
|
* @param b the byte to search for.
|
|
* @param from the index to start the search from.
|
|
* @param to the index to finish the search at.
|
|
* @return the index of the first occurrence of the byte in the buffer
|
|
* within the given bounds, or <code>-1</code> if the byte does
|
|
* not occur.
|
|
*
|
|
* @since 4.1
|
|
*/
|
|
public int indexOf(final byte b, final int from, final int to) {
|
|
int beginIndex = from;
|
|
if (beginIndex < 0) {
|
|
beginIndex = 0;
|
|
}
|
|
int endIndex = to;
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* Returns the index within this buffer of the first occurrence of the
|
|
* specified byte, starting the search at <code>0</code> and finishing
|
|
* at {@link #length()}. If no such byte occurs in this buffer within
|
|
* those bounds, <code>-1</code> is returned.
|
|
*
|
|
* @param b the byte to search for.
|
|
* @return the index of the first occurrence of the byte in the
|
|
* buffer, or <code>-1</code> if the byte does not occur.
|
|
*
|
|
* @since 4.1
|
|
*/
|
|
public int indexOf(final byte b) {
|
|
return indexOf(b, 0, this.len);
|
|
}
|
|
}
|