/*
* Created on Jul 9, 2009
* (c) 2009 Trumpet, Inc.
*
*/
package com.itextpdf.text.pdf.parser;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ListIterator;
import org.junit.Assert;
import org.junit.Before;
import org.junit.BeforeClass;
import org.junit.Test;
import com.itextpdf.testutils.TestResourceUtils;
import com.itextpdf.text.pdf.PRIndirectReference;
import com.itextpdf.text.pdf.PRStream;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfReader;
public class PdfContentStreamProcessorTest
{
private DebugRenderListener _renderListener;
@BeforeClass
public static void setUpClass() throws Exception {
}
@Before
public void setUp() throws Exception{
_renderListener = new DebugRenderListener();
}
// Replicates iText bug 2817030
@Test
public void testPositionAfterTstar()
throws Exception
{
processBytes("yaxiststar.pdf", 1);
}
private void processBytes(
final String resourceName,
final int pageNumber)
throws IOException
{
final PdfReader pdfReader = TestResourceUtils.getResourceAsPdfReader(this, resourceName);
final PdfDictionary pageDictionary = pdfReader.getPageN(pageNumber);
final PdfDictionary resourceDictionary = pageDictionary.getAsDict(PdfName.RESOURCES);
final PdfObject contentObject = pageDictionary.get(PdfName.CONTENTS);
final byte[] contentBytes = readContentBytes(contentObject);
PdfContentStreamProcessor processor = new PdfContentStreamProcessor(_renderListener);
processor.processContent(contentBytes, resourceDictionary);
}
private byte[] readContentBytes(
final PdfObject contentObject)
throws IOException
{
final byte[] result;
switch (contentObject.type())
{
case PdfObject.INDIRECT:
final PRIndirectReference ref = (PRIndirectReference) contentObject;
final PdfObject directObject = PdfReader.getPdfObject(ref);
result = readContentBytes(directObject);
break;
case PdfObject.STREAM:
final PRStream stream = (PRStream) PdfReader.getPdfObject(contentObject);
result = PdfReader.getStreamBytes(stream);
break;
case PdfObject.ARRAY:
// Stitch together all content before calling processContent(), because
// processContent() resets state.
final ByteArrayOutputStream allBytes = new ByteArrayOutputStream();
final PdfArray contentArray = (PdfArray) contentObject;
final ListIterator iter = contentArray.listIterator();
while (iter.hasNext())
{
final PdfObject element = (PdfObject) iter.next();
allBytes.write(readContentBytes(element));
}
result = allBytes.toByteArray();
break;
default:
final String msg = "Unable to handle Content of type " + contentObject.getClass();
throw new IllegalStateException(msg);
}
return result;
}
private class DebugRenderListener
implements RenderListener
{
private float _lastY = Float.MAX_VALUE;
@Override
public void reset() {
_lastY = Float.MAX_VALUE;
}
@Override
public void renderText(TextRenderInfo renderInfo) {
Vector start = renderInfo.getStartPoint();
final float x = start.get(Vector.I1);
final float y = start.get(Vector.I2);
System.out.println("Display text: '" + renderInfo.getText() + "' (" + x + "," + y + ")");
if (y > _lastY){
Assert.fail("Text has jumped back up the page");
}
_lastY = y;
}
}
}