com.itextpdf.text.pdf.internal.PdfAChecker Maven / Gradle / Ivy
/*
*
* This file is part of the iText (R) project.
Copyright (c) 1998-2017 iText Group NV
* Authors: Alexander Chingarev, Bruno Lowagie, et al.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License version 3
* as published by the Free Software Foundation with the addition of the
* following permission added to Section 15 as permitted in Section 7(a):
* FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY
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* or FITNESS FOR A PARTICULAR PURPOSE.
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* You should have received a copy of the GNU Affero General Public License
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* Boston, MA, 02110-1301 USA, or download the license from the following URL:
* http://itextpdf.com/terms-of-use/
*
* The interactive user interfaces in modified source and object code versions
* of this program must display Appropriate Legal Notices, as required under
* Section 5 of the GNU Affero General Public License.
*
* In accordance with Section 7(b) of the GNU Affero General Public License,
* a covered work must retain the producer line in every PDF that is created
* or manipulated using iText.
*
* You can be released from the requirements of the license by purchasing
* a commercial license. Buying such a license is mandatory as soon as you
* develop commercial activities involving the iText software without
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*/
package com.itextpdf.text.pdf.internal;
import com.itextpdf.text.ExceptionConverter;
import com.itextpdf.text.error_messages.MessageLocalization;
import com.itextpdf.text.io.TempFileCache;
import com.itextpdf.text.pdf.PdfAConformanceException;
import com.itextpdf.text.pdf.PdfAConformanceLevel;
import com.itextpdf.text.pdf.PdfAStamperImp;
import com.itextpdf.text.pdf.PdfArray;
import com.itextpdf.text.pdf.PdfDictionary;
import com.itextpdf.text.pdf.PdfIndirectReference;
import com.itextpdf.text.pdf.PdfName;
import com.itextpdf.text.pdf.PdfObject;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfStream;
import com.itextpdf.text.pdf.PdfWriter;
import com.itextpdf.text.pdf.RefKey;
import java.io.IOException;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import java.util.logging.Logger;
abstract public class PdfAChecker {
protected final Logger LOGGER = Logger.getLogger(getClass().getName());
protected PdfAConformanceLevel conformanceLevel;
private HashMap cachedObjects = new HashMap();
private HashSet keysForCheck = initKeysForCheck();
private static byte[] emptyByteArray = new byte[]{};
TempFileCache fileCache;
private boolean isToUseExternalCache = false;
private HashMap externallyCachedObjects = new HashMap();
protected String pdfaOutputIntentColorSpace = null;
protected PdfObject pdfaDestOutputIntent = null;
protected boolean isCheckOutputIntent = false;
PdfAChecker(PdfAConformanceLevel conformanceLevel) {
this.conformanceLevel = conformanceLevel;
}
abstract protected HashSet initKeysForCheck();
public void cacheObject(PdfIndirectReference iref, PdfObject obj) {
if (obj.type() == 0) {
putObjectToCache(new RefKey(iref), obj);
} else if (obj instanceof PdfDictionary) {
putObjectToCache(new RefKey(iref), cleverPdfDictionaryClone((PdfDictionary) obj));
} else if (obj.isArray()) {
putObjectToCache(new RefKey(iref), cleverPdfArrayClone((PdfArray) obj));
}
}
public void useExternalCache(TempFileCache fileCache) {
isToUseExternalCache = true;
this.fileCache = fileCache;
for (Map.Entry entry : cachedObjects.entrySet()) {
putObjectToCache(entry.getKey(), entry.getValue());
}
cachedObjects.clear();
}
abstract public void close(PdfWriter writer);
private PdfObject cleverPdfArrayClone(PdfArray array) {
PdfArray newArray = new PdfArray();
for (int i = 0; i < array.size(); i++) {
PdfObject obj = array.getPdfObject(i);
if (obj instanceof PdfDictionary)
newArray.add(cleverPdfDictionaryClone((PdfDictionary) obj));
else
newArray.add(obj);
}
return newArray;
}
private PdfObject cleverPdfDictionaryClone(PdfDictionary dict) {
PdfDictionary newDict;
if (dict.isStream()) {
newDict = new PdfStream(emptyByteArray);
newDict.remove(PdfName.LENGTH);
} else
newDict = new PdfDictionary();
for (PdfName key : dict.getKeys())
if (keysForCheck.contains(key))
newDict.put(key, dict.get(key));
return newDict;
}
protected PdfObject getDirectObject(PdfObject obj) {
if (obj == null)
return null;
// use counter to prevent indirect reference cycling
int count = 0;
// resolve references
while (obj instanceof PdfIndirectReference) {
PdfObject curr;
if (obj.isIndirect())
curr = PdfReader.getPdfObject(obj);
else
curr = getObjectFromCache(new RefKey((PdfIndirectReference) obj));
if (curr == null) break;
obj = curr;
//10 - is max allowed reference chain
if (count++ > 10)
break;
}
return obj;
}
protected PdfDictionary getDirectDictionary(PdfObject obj) {
obj = getDirectObject(obj);
if (obj != null && obj instanceof PdfDictionary)
return (PdfDictionary) obj;
return null;
}
protected PdfStream getDirectStream(PdfObject obj) {
obj = getDirectObject(obj);
if (obj != null && obj.isStream())
return (PdfStream) obj;
return null;
}
protected PdfArray getDirectArray(PdfObject obj) {
obj = getDirectObject(obj);
if (obj != null && obj.isArray())
return (PdfArray) obj;
return null;
}
abstract protected void checkFont(PdfWriter writer, int key, Object obj1);
abstract protected void checkImage(PdfWriter writer, int key, Object obj1);
abstract protected void checkInlineImage(PdfWriter writer, int key, Object obj1);
abstract protected void checkFormXObj(PdfWriter writer, int key, Object obj1);
abstract protected void checkGState(PdfWriter writer, int key, Object obj1);
abstract protected void checkLayer(PdfWriter writer, int key, Object obj1);
abstract protected void checkTrailer(PdfWriter writer, int key, Object obj1);
abstract protected void checkStream(PdfWriter writer, int key, Object obj1);
abstract protected void checkFileSpec(PdfWriter writer, int key, Object obj1);
abstract protected void checkPdfObject(PdfWriter writer, int key, Object obj1);
abstract protected void checkCanvas(PdfWriter writer, int key, Object obj1);
abstract protected void checkColor(PdfWriter writer, int key, Object obj1);
abstract protected void checkAnnotation(PdfWriter writer, int key, Object obj1);
abstract protected void checkAction(PdfWriter writer, int key, Object obj1);
abstract protected void checkForm(PdfWriter writer, int key, Object obj1);
abstract protected void checkStructElem(PdfWriter writer, int key, Object obj1);
abstract protected void checkOutputIntent(PdfWriter writer, int key, Object obj1);
void checkPdfAConformance(PdfWriter writer, int key, Object obj1) {
if (writer == null || !writer.isPdfIso())
return;
switch (key) {
case PdfIsoKeys.PDFISOKEY_FONT:
checkFont(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_IMAGE:
checkImage(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_GSTATE:
checkGState(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_LAYER:
checkLayer(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_TRAILER:
checkTrailer(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_STREAM:
checkStream(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_FILESPEC:
checkFileSpec(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_OBJECT:
checkPdfObject(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_CANVAS:
checkCanvas(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_COLOR:
case PdfIsoKeys.PDFISOKEY_CMYK:
case PdfIsoKeys.PDFISOKEY_RGB:
checkColor(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_ANNOTATION:
checkAnnotation(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_ACTION:
checkAction(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_FORM:
checkForm(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_STRUCTELEM:
if (checkStructure(conformanceLevel))
checkStructElem(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_INLINE_IMAGE:
checkInlineImage(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_OUTPUTINTENT:
checkOutputIntent(writer, key, obj1);
break;
case PdfIsoKeys.PDFISOKEY_FORM_XOBJ:
checkFormXObj(writer, key, obj1);
break;
default:
break;
}
}
public static boolean checkStructure(PdfAConformanceLevel conformanceLevel) {
return conformanceLevel == PdfAConformanceLevel.PDF_A_1A
|| conformanceLevel == PdfAConformanceLevel.PDF_A_2A
|| conformanceLevel == PdfAConformanceLevel.PDF_A_3A;
}
protected static boolean checkFlag(int flags, int flag) {
return (flags & flag) != 0;
}
private void putObjectToCache(RefKey ref, PdfObject obj) {
if (isToUseExternalCache) {
TempFileCache.ObjectPosition pos = null;
try {
pos = fileCache.put(obj);
} catch (IOException e) {
throw new ExceptionConverter(e);
}
externallyCachedObjects.put(ref, pos);
} else {
cachedObjects.put(ref, obj);
}
}
private PdfObject getObjectFromCache(RefKey ref) {
if (isToUseExternalCache) {
PdfObject obj = null;
TempFileCache.ObjectPosition pos = externallyCachedObjects.get(ref);
try {
obj = fileCache.get(pos);
} catch (IOException e) {
throw new ExceptionConverter(e);
} catch (ClassNotFoundException e) {
throw new ExceptionConverter(e);
}
return obj;
} else {
return cachedObjects.get(ref);
}
}
protected void checkOutputIntentsInStamperMode(PdfWriter writer) {
if (writer instanceof PdfAStamperImp && !isCheckOutputIntent) {
PdfReader pdfReader = ((PdfAStamperImp) writer).getPdfReader();
PdfArray outPutIntentsDic = pdfReader.getCatalog().getAsArray(PdfName.OUTPUTINTENTS);
if (outPutIntentsDic != null) {
if (outPutIntentsDic.size() > 1) {
throw new PdfAConformanceException(outPutIntentsDic, MessageLocalization.getComposedMessage("a.pdfa.file.may.have.only.one.pdfa.outputintent"));
} else {
PdfDictionary outPutIntentDic = outPutIntentsDic.getAsDict(0);
if (outPutIntentDic != null) {
checkPdfObject(writer, PdfIsoKeys.PDFISOKEY_OBJECT, outPutIntentDic);
}
}
}
}
}
}
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