org.jpedal.parser.PdfStreamDecoderForSampling Maven / Gradle / Ivy
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/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/java-pdf-library-support/
*
* (C) Copyright 1997-2013, IDRsolutions and Contributors.
*
* This file is part of JPedal
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* PdfStreamDecoderForSampling.java
* ---------------
*/
package org.jpedal.parser;
import org.jpedal.exception.PdfException;
import org.jpedal.external.ExternalHandlers;
import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.GraphicsState;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
public class PdfStreamDecoderForSampling extends PdfStreamDecoder {
public PdfStreamDecoderForSampling(PdfObjectReader currentPdfFile) {
super(currentPdfFile);
}
/**
*
* just scan for DO and CM to get image sizes so we can work out sampling used
*/
public final float decodePageContentForImageSampling(PdfObject pdfObject) throws PdfException {/* take out min's%% */
try {
this.renderDirectly = true;
// check switched off
this.imagesProcessedFully = true;
// reset count
this.imageCount = 0;
this.gs = new GraphicsState(0, 0);/* take out min's%% */
// get the binary data from the file
byte[] b_data;
byte[][] pageContents = null;
if (pdfObject != null) {
pageContents = pdfObject.getKeyArray(PdfDictionary.Contents);
this.isDataValid = pdfObject.streamMayBeCorrupt();
}
if (pdfObject != null && pageContents == null) b_data = this.currentPdfFile.readStream(pdfObject, true, true, false, false, false,
pdfObject.getCacheName(this.currentPdfFile.getObjectReader()));
else
if (this.pageStream != null) b_data = this.pageStream;
else b_data = this.currentPdfFile.getObjectReader().readPageIntoStream(pdfObject);
// if page data found, turn it into a set of commands
// and decode the stream of commands
if (b_data != null && b_data.length > 0) {
this.getSamplingOnly = true;
decodeStreamIntoObjects(b_data, false);
}
// flush fonts
this.cache.resetFonts();
return this.samplingUsed;
}
catch (Error err) {
this.errorTracker.addPageFailureMessage("Problem decoding page " + err);
if (ExternalHandlers.throwMissingCIDError && err.getMessage().contains("kochi")) throw err;
}
return -1;
}
}