| /* ==================================================================== |
| 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. |
| ==================================================================== */ |
| |
| package org.apache.poi.hslf.blip; |
| |
| import org.apache.poi.hslf.usermodel.HSLFPictureShape; |
| import org.apache.poi.util.PngUtils; |
| |
| /** |
| * Represents a PNG picture data in a PPT file |
| * |
| * @author Yegor Kozlov |
| */ |
| public final class PNG extends Bitmap { |
| |
| /** |
| * @return PNG data |
| */ |
| public byte[] getData() { |
| byte[] data = super.getData(); |
| |
| //PNG created on MAC may have a 16-byte prefix which prevents successful reading. |
| //Just cut it off!. |
| if (PngUtils.matchesPngHeader(data, 16)) { |
| byte[] png = new byte[data.length-16]; |
| System.arraycopy(data, 16, png, 0, png.length); |
| data = png; |
| } |
| |
| return data; |
| } |
| |
| /** |
| * @return type of this picture |
| * @see org.apache.poi.hslf.usermodel.HSLFPictureShape#PNG |
| */ |
| public int getType(){ |
| return HSLFPictureShape.PNG; |
| } |
| |
| /** |
| * PNG signature is {@code 0x6E00} or {@code 0x6E10} |
| * |
| * @return PNG signature ({@code 0x6E00} or {@code 0x6E10}) |
| */ |
| public int getSignature(){ |
| return (uidInstanceCount == 1 ? 0x6E00 : 0x6E10); |
| } |
| |
| /** |
| * Sets the PNG signature - either {@code 0x6E00} or {@code 0x6E10} |
| */ |
| public void setSignature(int signature) { |
| switch (signature) { |
| case 0x6E00: |
| uidInstanceCount = 1; |
| break; |
| case 0x6E10: |
| uidInstanceCount = 2; |
| break; |
| default: |
| throw new IllegalArgumentException(signature+" is not a valid instance/signature value for PNG"); |
| } |
| } |
| |
| public String getContentType() { |
| return "image/png"; |
| } |
| } |