80 lines
2.5 KiB
Java
80 lines
2.5 KiB
Java
/* ====================================================================
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Licensed to the Apache Software Foundation (ASF) under one or more
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contributor license agreements. See the NOTICE file distributed with
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this work for additional information regarding copyright ownership.
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The ASF licenses this file to You under the Apache License, Version 2.0
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(the "License"); you may not use this file except in compliance with
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the License. You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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==================================================================== */
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package org.apache.poi.hslf.blip;
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import org.apache.poi.hslf.model.Picture;
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import org.apache.poi.util.PngUtils;
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/**
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* Represents a PNG picture data in a PPT file
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*
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* @author Yegor Kozlov
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*/
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public final class PNG extends Bitmap {
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/**
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* @return PNG data
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*/
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public byte[] getData() {
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byte[] data = super.getData();
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//PNG created on MAC may have a 16-byte prefix which prevents successful reading.
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//Just cut it off!.
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if (PngUtils.matchesPngHeader(data, 16)) {
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byte[] png = new byte[data.length-16];
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System.arraycopy(data, 16, png, 0, png.length);
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data = png;
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}
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return data;
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}
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/**
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* @return type of this picture
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* @see org.apache.poi.hslf.model.Picture#PNG
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*/
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public int getType(){
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return Picture.PNG;
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}
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/**
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* PNG signature is {@code 0x6E00} or {@code 0x6E10}
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*
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* @return PNG signature ({@code 0x6E00} or {@code 0x6E10})
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*/
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public int getSignature(){
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return (uidInstanceCount == 1 ? 0x6E00 : 0x6E10);
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}
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/**
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* Sets the PNG signature - either {@code 0x6E00} or {@code 0x6E10}
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*/
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public void setSignature(int signature) {
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switch (signature) {
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case 0x6E00:
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uidInstanceCount = 1;
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break;
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case 0x6E10:
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uidInstanceCount = 2;
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break;
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default:
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throw new IllegalArgumentException(signature+" is not a valid instance/signature value for PNG");
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}
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}
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}
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