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/*
* $Id: 8eb2128941b584f4693a8c21dcaee225d654b78d $
*
* This file is part of the iText (R) project.
* Copyright (c) 1998-2015 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
* ITEXT GROUP. ITEXT GROUP DISCLAIMS THE WARRANTY OF NON INFRINGEMENT
* OF THIRD PARTY RIGHTS
*
* This program 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 Affero General Public License for more details.
* You should have received a copy of the GNU Affero General Public License
* along with this program; if not, see http://www.gnu.org/licenses or write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* 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
* disclosing the source code of your own applications.
* These activities include: offering paid services to customers as an ASP,
* serving PDFs on the fly in a web application, shipping iText with a closed
* source product.
*
* For more information, please contact iText Software Corp. at this
* address: [email protected]
*/
package com.itextpdf.text.pdf.internal;
import com.itextpdf.text.pdf.*;
import java.util.HashMap;
import java.util.HashSet;
abstract public class PdfAChecker {
protected PdfAConformanceLevel conformanceLevel;
protected HashMap cachedObjects = new HashMap();
private HashSet keysForCheck = initKeysForCheck();
private static byte[] emptyByteArray = new byte[]{};
PdfAChecker(PdfAConformanceLevel conformanceLevel) {
this.conformanceLevel = conformanceLevel;
}
abstract protected HashSet initKeysForCheck();
public void cacheObject(PdfIndirectReference iref, PdfObject obj) {
if (obj.type() == 0) {
cachedObjects.put(new RefKey(iref), obj);
} else if (obj instanceof PdfDictionary) {
cachedObjects.put(new RefKey(iref), cleverPdfDictionaryClone((PdfDictionary)obj));
} else if (obj.isArray()){
cachedObjects.put(new RefKey(iref), cleverPdfArrayClone((PdfArray)obj));
}
}
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 = cachedObjects.get(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;
}
}
