| /* |
| * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package com.sun.imageio.plugins.tiff; |
| |
| import java.io.IOException; |
| |
| public class TIFFPackBitsUtil { |
| |
| byte[] dstData = new byte[8192]; |
| int dstIndex = 0; |
| |
| public TIFFPackBitsUtil() { |
| } |
| |
| private void ensureCapacity(int bytesToAdd) { |
| if (dstIndex + bytesToAdd > dstData.length) { |
| byte[] newDstData = new byte[Math.max((int)(dstData.length*1.2f), |
| dstIndex + bytesToAdd)]; |
| System.arraycopy(dstData, 0, newDstData, 0, dstData.length); |
| dstData = newDstData; |
| } |
| } |
| |
| public byte[] decode(byte[] srcData) throws IOException { |
| int inIndex = 0; |
| while (inIndex < srcData.length) { |
| byte b = srcData[inIndex++]; |
| |
| if (b >= 0 && b <= 127) { |
| // Literal run packet |
| |
| ensureCapacity(b + 1); |
| for (int i = 0; i < b + 1; i++) { |
| dstData[dstIndex++] = srcData[inIndex++]; |
| } |
| } else if (b <= -1 && b >= -127) { |
| // 2-byte encoded run packet |
| byte repeat = srcData[inIndex++]; |
| ensureCapacity(-b + 1); |
| for (int i = 0; i < (-b + 1); i++) { |
| dstData[dstIndex++] = repeat; |
| } |
| } else { |
| // No-op packet, do nothing |
| ++inIndex; |
| } |
| } |
| |
| byte[] newDstData = new byte[dstIndex]; |
| System.arraycopy(dstData, 0, newDstData, 0, dstIndex); |
| return newDstData; |
| } |
| } |