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- /* ====================================================================
- 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);
- }
- }
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