| /* ==================================================================== |
| 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 java.io.IOException; |
| |
| import org.apache.poi.util.LittleEndian; |
| |
| /** |
| * Represents a DIB picture data in a PPT file |
| */ |
| public final class DIB extends Bitmap { |
| /** |
| * Size of the BITMAPFILEHEADER structure preceding the actual DIB bytes |
| */ |
| private static final int HEADER_SIZE = 14; |
| |
| @Override |
| public PictureType getType(){ |
| return PictureType.DIB; |
| } |
| |
| /** |
| * DIB signature is {@code 0x7A80} or {@code 0x7A90} |
| * |
| * @return DIB signature ({@code 0x7A80} or {@code 0x7A90}) |
| */ |
| public int getSignature(){ |
| return (getUIDInstanceCount() == 1 ? 0x7A80 : 0x7A90); |
| } |
| |
| /** |
| * Sets the DIB signature - either {@code 0x7A80} or {@code 0x7A90} |
| */ |
| public void setSignature(int signature) { |
| switch (signature) { |
| case 0x7A80: |
| setUIDInstanceCount(1); |
| break; |
| case 0x7A90: |
| setUIDInstanceCount(2); |
| break; |
| default: |
| throw new IllegalArgumentException(signature+" is not a valid instance/signature value for DIB"); |
| } |
| } |
| |
| @Override |
| public byte[] getData(){ |
| return addBMPHeader ( super.getData() ); |
| } |
| |
| public static byte[] addBMPHeader(byte[] data){ |
| // bitmap file-header, corresponds to a |
| // Windows BITMAPFILEHEADER structure |
| // (For more information, consult the Windows API Programmer's reference ) |
| byte[] header = new byte[HEADER_SIZE]; |
| //Specifies the file type. It must be set to the signature word BM (0x4D42) to indicate bitmap. |
| LittleEndian.putInt(header, 0, 0x4D42); |
| |
| // read the size of the image and calculate the overall file size |
| // and the offset where the bitmap starts |
| int imageSize = LittleEndian.getInt(data, 0x22 - HEADER_SIZE); |
| int fileSize = data.length + HEADER_SIZE; |
| int offset = fileSize - imageSize; |
| |
| // specifies the size, in bytes, of the bitmap file - must add the length of the header |
| LittleEndian.putInt(header, 2, fileSize); |
| // Reserved; set to zero |
| LittleEndian.putInt(header, 6, 0); |
| // the offset, i.e. starting address, of the byte where the bitmap data can be found |
| LittleEndian.putInt(header, 10, offset); |
| |
| //DIB data is the header + dib bytes |
| byte[] dib = new byte[header.length + data.length]; |
| System.arraycopy(header, 0, dib, 0, header.length); |
| System.arraycopy(data, 0, dib, header.length, data.length); |
| |
| return dib; |
| } |
| |
| @Override |
| public void setData(byte[] data) throws IOException { |
| //cut off the bitmap file-header |
| byte[] dib = new byte[data.length-HEADER_SIZE]; |
| System.arraycopy(data, HEADER_SIZE, dib, 0, dib.length); |
| super.setData(dib); |
| } |
| } |