93 lines
3.3 KiB
Java
93 lines
3.3 KiB
Java
/* ====================================================================
|
|
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.model.Picture;
|
|
import org.apache.poi.util.LittleEndian;
|
|
|
|
import java.io.IOException;
|
|
|
|
/**
|
|
* Represents a DIB picture data in a PPT file
|
|
*
|
|
* @author Yegor Kozlov
|
|
*/
|
|
public final class DIB extends Bitmap {
|
|
/**
|
|
* Size of the BITMAPFILEHEADER structure preceding the actual DIB bytes
|
|
*/
|
|
public static final int HEADER_SIZE = 14;
|
|
|
|
/**
|
|
* @return type of this picture
|
|
* @see org.apache.poi.hslf.model.Picture#DIB
|
|
*/
|
|
public int getType(){
|
|
return Picture.DIB;
|
|
}
|
|
|
|
/**
|
|
* DIB signature is <code>0x7A80</code>
|
|
*
|
|
* @return DIB signature (<code>0x7A80</code>)
|
|
*/
|
|
public int getSignature(){
|
|
return 0x7A80;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
}
|