01: /* ====================================================================
02: Licensed to the Apache Software Foundation (ASF) under one or more
03: contributor license agreements. See the NOTICE file distributed with
04: this work for additional information regarding copyright ownership.
05: The ASF licenses this file to You under the Apache License, Version 2.0
06: (the "License"); you may not use this file except in compliance with
07: the License. You may obtain a copy of the License at
08:
09: http://www.apache.org/licenses/LICENSE-2.0
10:
11: Unless required by applicable law or agreed to in writing, software
12: distributed under the License is distributed on an "AS IS" BASIS,
13: WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14: See the License for the specific language governing permissions and
15: limitations under the License.
16: ==================================================================== */
17: package org.apache.poi.hslf.blip;
18:
19: import org.apache.poi.hslf.model.Picture;
20: import org.apache.poi.util.LittleEndian;
21:
22: import java.io.IOException;
23:
24: /**
25: * Represents a DIB picture data in a PPT file
26: *
27: * @author Yegor Kozlov
28: */
29: public class DIB extends Bitmap {
30: /**
31: * Size of the BITMAPFILEHEADER structure preceding the actual DIB bytes
32: */
33: public static final int HEADER_SIZE = 14;
34:
35: /**
36: * @return type of this picture
37: * @see org.apache.poi.hslf.model.Picture#DIB
38: */
39: public int getType() {
40: return Picture.DIB;
41: }
42:
43: /**
44: * DIB signature is <code>0x7A80</code>
45: *
46: * @return DIB signature (<code>0x7A80</code>)
47: */
48: public int getSignature() {
49: return 0x7A80;
50: }
51:
52: public byte[] getData() {
53: byte[] data = super .getData();
54:
55: // bitmap file-header, corresponds to a
56: // Windows BITMAPFILEHEADER structure
57: // (For more information, consult the Windows API Programmer's reference )
58: byte[] header = new byte[HEADER_SIZE];
59: //Specifies the file type. It must be set to the signature word BM (0x4D42) to indicate bitmap.
60: LittleEndian.putInt(header, 0, 0x4D42);
61: //Specifies the size, in bytes, of the bitmap file.
62: LittleEndian.putInt(header, 2, data.length); //DIB length including the header
63: //Reserved; set to zero
64: LittleEndian.putInt(header, 6, 0);
65: //the offset, in bytes, from the header to the bitmap bits (looks like it is always 2)
66: LittleEndian.putInt(header, 10, 2);
67:
68: //DIB data is the header + dib bytes
69: byte[] dib = new byte[header.length + data.length];
70: System.arraycopy(header, 0, dib, 0, header.length);
71: System.arraycopy(data, 0, dib, header.length, data.length);
72:
73: return dib;
74: }
75:
76: public void setData(byte[] data) throws IOException {
77: //cut off the bitmap file-header
78: byte[] dib = new byte[data.length - HEADER_SIZE];
79: System.arraycopy(data, HEADER_SIZE, dib, 0, dib.length);
80: super.setData(dib);
81: }
82: }
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