File	Doc	Category	Size	Date	Package
PictureData.java	API Doc	Apache Poi 3.0.1	6117	Thu May 31 18:45:28 BST 2007	org.apache.poi.hslf.usermodel

PictureData

• java.lang.Object

Fields Summary
protected static final int	CHECKSUM_SIZE Size of the image checksum calculated using MD5 algorithm.
private byte[]	rawdata Binary data of the picture
protected int	offset The offset to the picture in the stream

Constructors Summary

Methods Summary
public static org.apache.poi.hslf.usermodel.PictureData	create(int type) Create an instance of PictureData by type. param type type of the picture data. Must be one of the static constants defined in the Picture class. return concrete instance of PictureData PictureData pict; switch (type){ case Picture.EMF: pict = new EMF(); break; case Picture.WMF: pict = new WMF(); break; case Picture.PICT: pict = new PICT(); break; case Picture.JPEG: pict = new JPEG(); break; case Picture.PNG: pict = new PNG(); break; case Picture.DIB: pict = new DIB(); break; default: throw new IllegalArgumentException("Unsupported picture type: " + type); } return pict;
public static byte[]	getChecksum(byte[] data) Compute 16-byte checksum of this picture using MD5 algorithm. MessageDigest sha; try { sha = MessageDigest.getInstance("MD5"); } catch (NoSuchAlgorithmException e){ throw new HSLFException(e.getMessage()); } sha.update(data); return sha.digest();
public abstract byte[]	getData() Returns the binary data of this Picture return picture data
public byte[]	getHeader() Return 24 byte header which preceeds the actual picture data. The header consists of 2-byte signature, 2-byte type, 4-byte image size and 16-byte checksum of the image data. return the 24 byte header which preceeds the actual picture data. byte[] header = new byte[16 + 8]; LittleEndian.putInt(header, 0, getSignature()); LittleEndian.putInt(header, 4, getRawData().length); System.arraycopy(rawdata, 0, header, 8, 16); return header;
public int	getOffset() File offset in the 'Pictures' stream return offset in the 'Pictures' stream return offset;
public byte[]	getRawData() Returns the raw binary data of this Picture excluding the first 8 bytes which hold image signature and size of the image data. return picture data return rawdata;
protected abstract int	getSignature() Blip signature.
public int	getSize() Return image size in bytes return the size of the picture in bytes deprecated Use getData().length instead. return getData().length;
public abstract int	getType() Returns type of this picture. Must be one of the static constants defined in the Picture class. return type of this picture.
public byte[]	getUID() Returns 16-byte checksum of this picture byte[] uid = new byte[16]; System.arraycopy(rawdata, 0, uid, 0, uid.length); return uid;
public abstract void	setData(byte[] data) Set picture data
public void	setOffset(int offset) Set offset of this picture in the 'Pictures' stream. We need to set it when a new picture is created. param offset in the 'Pictures' stream this.offset = offset;
public void	setRawData(byte[] data) rawdata = data;
public void	write(java.io.OutputStream out) Write this picture into OutputStream byte[] data; data = new byte[LittleEndian.SHORT_SIZE]; LittleEndian.putUShort(data, 0, getSignature()); out.write(data); data = new byte[LittleEndian.SHORT_SIZE]; LittleEndian.putUShort(data, 0, getType() + 0xF018); out.write(data); byte[] rawdata = getRawData(); data = new byte[LittleEndian.INT_SIZE]; LittleEndian.putInt(data, 0, rawdata.length); out.write(data); out.write(rawdata);