org.apache.poi.hwpf.model.PicturesTable Maven / Gradle / Ivy
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package org.apache.poi.hwpf.model;
import java.util.ArrayList;
import java.util.List;
import org.apache.poi.ddf.DefaultEscherRecordFactory;
import org.apache.poi.ddf.EscherBSERecord;
import org.apache.poi.ddf.EscherBlipRecord;
import org.apache.poi.ddf.EscherRecord;
import org.apache.poi.ddf.EscherRecordFactory;
import org.apache.poi.hwpf.HWPFDocument;
import org.apache.poi.hwpf.usermodel.CharacterRun;
import org.apache.poi.hwpf.usermodel.Picture;
import org.apache.poi.hwpf.usermodel.Range;
import org.apache.poi.util.Internal;
import org.apache.poi.util.LittleEndian;
import org.apache.poi.util.POILogFactory;
import org.apache.poi.util.POILogger;
/**
* Holds information about all pictures embedded in Word Document either via "Insert -> Picture -> From File" or via
* clipboard. Responsible for images extraction and determining whether some document's piece contains embedded image.
* Analyzes raw data bytestream 'Data' (where Word stores all embedded objects) provided by HWPFDocument.
*
* Word stores images as is within so called "Data stream" - the stream within a Word docfile containing various data
* that hang off of characters in the main stream. For example, binary data describing in-line pictures and/or
* formfields an also embedded objects-native data. Word picture structures are concatenated one after the other in
* the data stream if the document contains pictures.
* Data stream is easily reachable via HWPFDocument._dataStream property.
* A picture is represented in the document text stream as a special character, an Unicode \u0001 whose
* CharacterRun.isSpecial() returns true. The file location of the picture in the Word binary file is accessed
* via CharacterRun.getPicOffset(). The CharacterRun.getPicOffset() is a byte offset into the data stream.
* Beginning at the position recorded in picOffset, a header data structure, will be stored.
*
* @author Dmitry Romanov
*/
@Internal
public final class PicturesTable
{
private static final POILogger logger = POILogFactory
.getLogger( PicturesTable.class );
static final int TYPE_IMAGE = 0x08;
static final int TYPE_IMAGE_WORD2000 = 0x00;
static final int TYPE_IMAGE_PASTED_FROM_CLIPBOARD = 0xA;
static final int TYPE_IMAGE_PASTED_FROM_CLIPBOARD_WORD2000 = 0x2;
static final int TYPE_HORIZONTAL_LINE = 0xE;
static final int BLOCK_TYPE_OFFSET = 0xE;
static final int MM_MODE_TYPE_OFFSET = 0x6;
private HWPFDocument _document;
private byte[] _dataStream;
private byte[] _mainStream;
@Deprecated
private FSPATable _fspa;
@Deprecated
private EscherRecordHolder _dgg;
/** @link dependency
* @stereotype instantiate*/
/*# Picture lnkPicture; */
/**
*
* @param _document
* @param _dataStream
*/
@Deprecated
public PicturesTable(HWPFDocument _document, byte[] _dataStream, byte[] _mainStream, FSPATable fspa, EscherRecordHolder dgg)
{
this._document = _document;
this._dataStream = _dataStream;
this._mainStream = _mainStream;
this._fspa = fspa;
this._dgg = dgg;
}
public PicturesTable( HWPFDocument _document, byte[] _dataStream,
byte[] _mainStream )
{
this._document = _document;
this._dataStream = _dataStream;
this._mainStream = _mainStream;
}
/**
* determines whether specified CharacterRun contains reference to a picture
* @param run
*/
public boolean hasPicture(CharacterRun run) {
if (run==null) {
return false;
}
if (run.isSpecialCharacter() && !run.isObj() && !run.isOle2() && !run.isData()) {
// Image should be in it's own run, or in a run with the end-of-special marker
if("\u0001".equals(run.text()) || "\u0001\u0015".equals(run.text())) {
return isBlockContainsImage(run.getPicOffset());
}
}
return false;
}
public boolean hasEscherPicture(CharacterRun run) {
if (run.isSpecialCharacter() && !run.isObj() && !run.isOle2() && !run.isData() && run.text().startsWith("\u0008")) {
return true;
}
return false;
}
/**
* determines whether specified CharacterRun contains reference to a picture
* @param run
*/
public boolean hasHorizontalLine(CharacterRun run) {
if (run.isSpecialCharacter() && "\u0001".equals(run.text())) {
return isBlockContainsHorizontalLine(run.getPicOffset());
}
return false;
}
private boolean isPictureRecognized(short blockType, short mappingModeOfMETAFILEPICT) {
return (blockType == TYPE_IMAGE || blockType == TYPE_IMAGE_PASTED_FROM_CLIPBOARD || (blockType==TYPE_IMAGE_WORD2000 && mappingModeOfMETAFILEPICT==0x64) || (blockType==TYPE_IMAGE_PASTED_FROM_CLIPBOARD_WORD2000 && mappingModeOfMETAFILEPICT==0x64));
}
private static short getBlockType(byte[] dataStream, int pictOffset) {
return LittleEndian.getShort(dataStream, pictOffset + BLOCK_TYPE_OFFSET);
}
private static short getMmMode(byte[] dataStream, int pictOffset) {
return LittleEndian.getShort(dataStream, pictOffset + MM_MODE_TYPE_OFFSET);
}
/**
* Returns picture object tied to specified CharacterRun
* @param run
* @param fillBytes if true, Picture will be returned with filled byte array that represent picture's contents. If you don't want
* to have that byte array in memory but only write picture's contents to stream, pass false and then use Picture.writeImageContent
* @see Picture#writeImageContent(java.io.OutputStream)
* @return a Picture object if picture exists for specified CharacterRun, null otherwise. PicturesTable.hasPicture is used to determine this.
* @see #hasPicture(org.apache.poi.hwpf.usermodel.CharacterRun)
*/
public Picture extractPicture(CharacterRun run, boolean fillBytes) {
if (hasPicture(run)) {
return new Picture(run.getPicOffset(), _dataStream, fillBytes);
}
return null;
}
/**
* Performs a recursive search for pictures in the given list of escher records.
*
* @param escherRecords the escher records.
* @param pictures the list to populate with the pictures.
*/
private void searchForPictures(List escherRecords, List pictures)
{
for(EscherRecord escherRecord : escherRecords) {
if (escherRecord instanceof EscherBSERecord) {
EscherBSERecord bse = (EscherBSERecord) escherRecord;
EscherBlipRecord blip = bse.getBlipRecord();
if (blip != null)
{
pictures.add(new Picture(blip));
}
else if ( bse.getOffset() > 0 )
{
try
{
// Blip stored in delay stream, which in a word doc, is
// the main stream
EscherRecordFactory recordFactory = new DefaultEscherRecordFactory();
EscherRecord record = recordFactory.createRecord(
_mainStream, bse.getOffset() );
if ( record instanceof EscherBlipRecord )
{
record.fillFields( _mainStream, bse.getOffset(),
recordFactory );
blip = (EscherBlipRecord) record;
pictures.add( new Picture( blip ) );
}
}
catch ( Exception exc )
{
logger.log(
POILogger.WARN,
"Unable to load picture from BLIB record at offset #",
Integer.valueOf( bse.getOffset() ), exc );
}
}
}
// Recursive call.
searchForPictures(escherRecord.getChildRecords(), pictures);
}
}
/**
* Not all documents have all the images concatenated in the data stream
* although MS claims so. The best approach is to scan all character runs.
*
* @return a list of Picture objects found in current document
*/
public List getAllPictures() {
ArrayList pictures = new ArrayList();
Range range = _document.getOverallRange();
for (int i = 0; i < range.numCharacterRuns(); i++) {
CharacterRun run = range.getCharacterRun(i);
if (run==null) {
continue;
}
Picture picture = extractPicture(run, false);
if (picture != null) {
pictures.add(picture);
}
}
searchForPictures(_dgg.getEscherRecords(), pictures);
return pictures;
}
private boolean isBlockContainsImage(int i)
{
return isPictureRecognized(getBlockType(_dataStream, i), getMmMode(_dataStream, i));
}
private boolean isBlockContainsHorizontalLine(int i)
{
return getBlockType(_dataStream, i)==TYPE_HORIZONTAL_LINE && getMmMode(_dataStream, i)==0x64;
}
}
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