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Diffstat (limited to 'mobile/android/thirdparty/ch/boye/httpclientandroidlib/util/ByteArrayBuffer.java')
| -rw-r--r-- | mobile/android/thirdparty/ch/boye/httpclientandroidlib/util/ByteArrayBuffer.java | 347 |
1 files changed, 347 insertions, 0 deletions
diff --git a/mobile/android/thirdparty/ch/boye/httpclientandroidlib/util/ByteArrayBuffer.java b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/util/ByteArrayBuffer.java new file mode 100644 index 000000000..cbf7c943d --- /dev/null +++ b/mobile/android/thirdparty/ch/boye/httpclientandroidlib/util/ByteArrayBuffer.java @@ -0,0 +1,347 @@ +/* + * ==================================================================== + * 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); + } +} |