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/*******************************************************************************
* Copyright (c) 2010, 2011 SAP AG
*
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Lazar Kirchev, SAP AG - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.console.common;
/**
* This is a helper class, which buffers one line of input. It provides
* for simple line editing - insertion, deletion, left and right movement, deletion through the
* backspace key.
*/
public class SimpleByteBuffer {
private static int INITAL_SIZE = 13;
private byte[] buffer;
private int pos = 0;
private int size = 0;
public SimpleByteBuffer() {
buffer = new byte[INITAL_SIZE];
}
public void add(final int b) {
if (size >= buffer.length) {
rezize();
}
buffer[size++] = (byte) b;
}
private void rezize() {
final byte[] newbuffeer = new byte[buffer.length << 1];
System.arraycopy(buffer, 0, newbuffeer, 0, buffer.length);
buffer = newbuffeer;
}
public void insert(int b) {
if (size >= buffer.length) {
rezize();
}
final int forCopy = size - pos;
if (forCopy > 0) {
System.arraycopy(buffer, pos, buffer, pos + 1, forCopy);
}
buffer[pos++] = (byte) b;
size++;
}
public int goRight() {
if (pos < size) {
return buffer[pos++] & 0xFF;
}
return -1;
}
public boolean goLeft() {
if (pos > 0) {
pos--;
return true;
}
return false;
}
public void delete() {
if (pos < size) {
final int forCopy = size - pos;
System.arraycopy(buffer, pos + 1, buffer, pos, forCopy);
size--;
}
}
public boolean backSpace() {
if (pos > 0 && size > 0) {
final int forCopy = size - pos;
System.arraycopy(buffer, pos, buffer, pos - 1, forCopy);
size--;
pos--;
return true;
}
return false;
}
public void delAll() {
pos = 0;
size = 0;
}
public byte[] getCurrentData() {
byte[] res = new byte[size];
System.arraycopy(buffer, 0, res, 0, size);
pos = 0;
size = 0;
return res;
}
public void set(byte[] newData) {
pos = 0;
size = 0;
if (newData != null) {
for (byte data : newData) {
insert(data);
}
}
}
public int getPos() {
return pos;
}
public byte[] copyCurrentData() {
byte[] res = new byte[size];
System.arraycopy(buffer, 0, res, 0, size);
return res;
}
public int getCurrentChar() {
if (pos < size) {
return buffer[pos] & 0xFF;
} else {
return -1;
}
}
public int getSize() {
return size;
}
public int resetPos() {
int res = pos;
pos = 0;
return res;
}
public void replace(int b) {
if (pos == size) {
insert(b);
} else {
buffer[pos++] = (byte) b;
}
}
}
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