File	Doc	Category	Size	Date	Package
HeaderBlockReader.java	API Doc	Apache Poi 3.0.1	5252	Thu May 31 18:44:06 BST 2007	org.apache.poi.poifs.storage

HeaderBlockReader

• java.lang.Object

Fields Summary
private IntegerField	_bat_count
private IntegerField	_property_start
private IntegerField	_sbat_start
private IntegerField	_xbat_start
private IntegerField	_xbat_count
private byte[]	_data

Constructors Summary

public HeaderBlockReader(InputStream stream) create a new HeaderBlockReader from an InputStream param stream the source InputStream exception IOException on errors or bad data _data = new byte[ POIFSConstants.BIG_BLOCK_SIZE ]; int byte_count = IOUtils.readFully(stream, _data); if (byte_count != POIFSConstants.BIG_BLOCK_SIZE) { if (byte_count == -1) //Cant have -1 bytes read in the error message! byte_count = 0; String type = " byte" + ((byte_count == 1) ? ("") : ("s")); throw new IOException("Unable to read entire header; " + byte_count + type + " read; expected " + POIFSConstants.BIG_BLOCK_SIZE + " bytes"); } // verify signature LongField signature = new LongField(_signature_offset, _data); if (signature.get() != _signature) { // Is it one of the usual suspects? if(_data[0] == 0x50 && _data[1] == 0x4b && _data[2] == 0x03 && _data[3] == 0x04) { throw new OfficeXmlFileException("The supplied data appears to be in the Office 2007+ XML. POI only supports OLE2 Office documents"); } // Give a generic error throw new IOException("Invalid header signature; read " + signature.get() + ", expected " + _signature); } _bat_count = new IntegerField(_bat_count_offset, _data); _property_start = new IntegerField(_property_start_offset, _data); _sbat_start = new IntegerField(_sbat_start_offset, _data); _xbat_start = new IntegerField(_xbat_start_offset, _data); _xbat_count = new IntegerField(_xbat_count_offset, _data);

Methods Summary
public int[]	getBATArray() return BAT array int[] result = new int[ _max_bats_in_header ]; int offset = _bat_array_offset; for (int j = 0; j < _max_bats_in_header; j++) { result[ j ] = LittleEndian.getInt(_data, offset); offset += LittleEndianConsts.INT_SIZE; } return result;
public int	getBATCount() return number of BAT blocks return _bat_count.get();
public int	getPropertyStart() get start of Property Table return the index of the first block of the Property Table return _property_start.get();
public int	getSBATStart() return start of small block allocation table return _sbat_start.get();
public int	getXBATCount() return XBAT count return _xbat_count.get();
public int	getXBATIndex() return XBAT index return _xbat_start.get();