fixed construction of the DIB picture header, see Bugzilla 43161

git-svn-id: https://svn.apache.org/repos/asf/poi/trunk@949483 13f79535-47bb-0310-9956-ffa450edef68

src/documentation/content/xdocs/status.xml

@@ -34,6 +34,8 @@
 
     <changes>
         <release version="3.7-SNAPSHOT" date="2010-??-??">
+           <action dev="POI-DEVELOPERS" type="fix">43161 - fixed construction of the DIB picture header</action>
+           <action dev="POI-DEVELOPERS" type="add">49311 - initial support for reading AES-encrypted/write-protected OOXML files</action>
            <action dev="POI-DEVELOPERS" type="fix">48718 - Make the creation of multiple, un-modified fonts in a row in XSSF match the old HSSF behaviour</action>
            <action dev="POI-DEVELOPERS" type="fix">44916 - Allow access to the HSSFPatriarch from HSSFSheet once created</action>
            <action dev="POI-DEVELOPERS" type="add">48779 - Allow you to get straight from a CellStyle to a Color, irrespective of if the Color is indexed or inline-defined</action>
@@ -93,7 +95,6 @@
            <action dev="POI-DEVELOPERS" type="fix">48339 - fixed ExternalNameRecord to properly distinguish DDE data from OLE data items </action>
            <action dev="POI-DEVELOPERS" type="fix">47920 - allow editing workbooks embedded into PowerPoint files</action>
            <action dev="POI-DEVELOPERS" type="add">48343 - added implementation of SUBTOTAL function</action>
-           <action dev="POI-DEVELOPERS" type="add">49311 - initial support for reading AES-encrypted/write-protected OOXML files</action>
         </release>
         <release version="3.6" date="2009-12-14">
            <action dev="POI-DEVELOPERS" type="fix">48332 - fixed XSSFSheet autoSizeColumn() to tolerate empty RichTextString</action>

src/scratchpad/src/org/apache/poi/hslf/blip/DIB.java

@@ -51,20 +51,29 @@ public final class DIB extends Bitmap {
     }
     
     public byte[] getData(){
-        byte[] data = super.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);
-        //Specifies the size, in bytes, of the bitmap file.
-        LittleEndian.putInt(header, 2, data.length); //DIB length including the header
+
+        // 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, in bytes, from the header to the bitmap bits (looks like it is always 2)
-        LittleEndian.putInt(header, 10, 2);
+        // 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];

src/scratchpad/testcases/org/apache/poi/hslf/usermodel/TestPictures.java

@@ -252,7 +252,7 @@ public final class TestPictures extends TestCase{
         SlideShow ppt = new SlideShow();
 
         Slide slide = ppt.createSlide();
-        byte[] src_bytes = slTests.readFile("sci_cec.dib");
+        byte[] src_bytes = slTests.readFile("clock.dib");
         int idx = ppt.addPicture(src_bytes, Picture.DIB);
         Picture pict = new Picture(idx);
         assertEquals(idx, pict.getPictureIndex());