CosOptimizer.java
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/*
* Decompiled with CFR 0_118.
*/
package com.adobe.internal.pdftoolkit.core.cos;
import com.adobe.internal.pdftoolkit.core.cos.CosArray;
import com.adobe.internal.pdftoolkit.core.cos.CosContainer;
import com.adobe.internal.pdftoolkit.core.cos.CosDictionary;
import com.adobe.internal.pdftoolkit.core.cos.CosDocument;
import com.adobe.internal.pdftoolkit.core.cos.CosList;
import com.adobe.internal.pdftoolkit.core.cos.CosNumeric;
import com.adobe.internal.pdftoolkit.core.cos.CosObject;
import com.adobe.internal.pdftoolkit.core.cos.CosObjectInfo;
import com.adobe.internal.pdftoolkit.core.cos.CosStream;
import com.adobe.internal.pdftoolkit.core.cos.XRefTable;
import com.adobe.internal.pdftoolkit.core.exceptions.PDFCosParseException;
import com.adobe.internal.pdftoolkit.core.exceptions.PDFIOException;
import com.adobe.internal.pdftoolkit.core.exceptions.PDFSecurityException;
import com.adobe.internal.pdftoolkit.core.types.ASName;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
final class CosOptimizer {
CosOptimizer() {
}
static boolean freeUnreferencedObjects(CosDocument cosDoc, CosContainer[] roots, boolean fixStreamLengths) throws PDFCosParseException, PDFIOException, PDFSecurityException, IOException {
CosList referencedInfos = CosOptimizer.findReferencedIndirectObjects(roots, fixStreamLengths);
CosList objStmInfos = cosDoc.getObjStmInfos();
Iterator iter = objStmInfos.iterator();
while (iter.hasNext()) {
CosObjectInfo stmInfo = (CosObjectInfo)iter.next();
referencedInfos.add(stmInfo.getObjNum(), stmInfo);
}
CosList allInfos = cosDoc.buildObjectList(false);
iter = allInfos.iterator();
boolean objectsFreed = false;
while (iter.hasNext()) {
CosObjectInfo info = (CosObjectInfo)iter.next();
if (referencedInfos.get(info.getObjNum()) != null) continue;
CosObject obj = info.getObject(false);
if (obj != null) {
obj.close();
}
info.markFree();
objectsFreed = true;
}
return objectsFreed;
}
static CosObject[] getUnreferencedObjects(CosDocument cosDoc, CosContainer[] roots) throws PDFCosParseException, PDFIOException, PDFSecurityException, IOException {
CosList referencedInfos = CosOptimizer.findReferencedIndirectObjects(roots, false);
CosList objStmInfos = cosDoc.getObjStmInfos();
Iterator iter = objStmInfos.iterator();
while (iter.hasNext()) {
CosObjectInfo stmInfo = (CosObjectInfo)iter.next();
referencedInfos.add(stmInfo.getObjNum(), stmInfo);
}
CosList allInfos = cosDoc.buildObjectList(false);
CosList unrefedObjs = new CosList();
iter = allInfos.iterator();
while (iter.hasNext()) {
CosObjectInfo info = (CosObjectInfo)iter.next();
if (referencedInfos.get(info.getObjNum()) != null) continue;
CosObject obj = info.getObject();
if (obj == null) {
obj = cosDoc.getXRef().getIndirectObject(info);
}
if (obj == null) continue;
unrefedObjs.add(info.getObjNum(), obj);
}
if (unrefedObjs.isEmpty()) {
return null;
}
CosObject[] list = new CosObject[unrefedObjs.count()];
iter = unrefedObjs.iterator();
int idx = 0;
while (iter.hasNext()) {
list[idx++] = (CosObject)iter.next();
}
return list;
}
private static CosList findReferencedIndirectObjects(CosContainer[] roots, boolean fixStreamLengths) throws PDFCosParseException, PDFIOException, PDFSecurityException {
if (roots == null) {
return null;
}
CosList foundObjects = new CosList();
for (int i = 0; i < roots.length; ++i) {
CosContainer root = roots[i];
if (root == null) continue;
if (root.isIndirect()) {
foundObjects.add(root.getInfo().getObjNum(), root.getInfo());
}
CosOptimizer.findReferencedIndirectObjects(root, foundObjects, fixStreamLengths);
}
return foundObjects;
}
private static void findReferencedIndirectObjects(CosContainer container, CosList foundObjects, boolean fixStreamLengths) throws PDFCosParseException, PDFIOException, PDFSecurityException {
ArrayList<Object> stateStack = new ArrayList<Object>();
Iterator containerIter = null;
CosObject containerItem = null;
boolean pushState = true;
do {
if (pushState) {
if (container instanceof CosArray) {
containerIter = ((CosArray)container).iterator();
} else {
CosObject cosLength;
if (fixStreamLengths && container instanceof CosStream && (cosLength = ((CosStream)container).get(ASName.k_Length)) instanceof CosNumeric && cosLength.isIndirect()) {
cosLength = cosLength.getDocument().createCosNumeric(cosLength.numberValue());
((CosStream)container).put(ASName.k_Length, cosLength);
}
List<ASName> keys = ((CosDictionary)container).getKeys();
containerIter = keys.iterator();
}
pushState = false;
}
while (containerIter.hasNext()) {
if (container instanceof CosArray) {
containerItem = containerIter.next();
} else {
ASName key = (ASName)((Object)containerIter.next());
containerItem = ((CosDictionary)container).get(key);
}
if (containerItem == null) continue;
CosObjectInfo itemInfo = containerItem.getInfo();
if (itemInfo != null) {
if (foundObjects.get(itemInfo.getObjNum()) != null) continue;
foundObjects.add(itemInfo.getObjNum(), itemInfo);
}
if (!(containerItem instanceof CosContainer)) continue;
pushState = true;
break;
}
if (pushState) {
stateStack.add(container);
stateStack.add(containerIter);
container = (CosContainer)containerItem;
continue;
}
if (stateStack.isEmpty()) {
return;
}
containerIter = (Iterator)stateStack.get(stateStack.size() - 1);
stateStack.remove(stateStack.size() - 1);
container = (CosContainer)stateStack.get(stateStack.size() - 1);
stateStack.remove(stateStack.size() - 1);
} while (true);
}
static void freeUnreferencedObjectsIncremental(CosDocument cosDoc, int objNumLimit) throws PDFCosParseException, PDFIOException, PDFSecurityException, IOException {
CosObjectInfo info;
CosObjectInfo info2;
CosList oldDirtyObjects = new CosList();
CosList newDirtyObjects = cosDoc.buildObjectList(true);
Iterator iter = newDirtyObjects.iterator();
while (iter.hasNext() && (info2 = (CosObjectInfo)iter.next()).getObjNum() < objNumLimit) {
oldDirtyObjects.add(info2.getObjNum(), info2);
iter.remove();
}
CosList referencedDirtyObjects = new CosList();
iter = oldDirtyObjects.iterator();
while (iter.hasNext()) {
info = (CosObjectInfo)iter.next();
CosOptimizer.findReferencedIndirectObjectsIncremental(info.getObject(), referencedDirtyObjects);
}
CosOptimizer.findReferencedIndirectObjectsIncremental(cosDoc.getTrailer(), referencedDirtyObjects);
iter = newDirtyObjects.iterator();
while (iter.hasNext()) {
info = (CosObjectInfo)iter.next();
if (referencedDirtyObjects.get(info.getObjNum()) != null) continue;
CosObject obj = info.getObject(false);
if (obj != null) {
obj.close();
}
info.markFree();
}
}
private static void findReferencedIndirectObjectsIncremental(CosObject obj, CosList list) throws PDFCosParseException, PDFIOException, PDFSecurityException {
if (!(obj instanceof CosContainer)) {
return;
}
CosContainer container = (CosContainer)obj;
ArrayList<Object> stateStack = new ArrayList<Object>();
Iterator containerIter = null;
CosObject containerItem = null;
boolean pushState = true;
do {
if (pushState) {
if (container instanceof CosArray) {
containerIter = ((CosArray)container).iterator();
} else {
List<ASName> keys = ((CosDictionary)container).getKeys();
containerIter = keys.iterator();
}
pushState = false;
}
while (containerIter.hasNext()) {
if (container instanceof CosArray) {
containerItem = containerIter.next();
} else {
ASName key = (ASName)((Object)containerIter.next());
containerItem = ((CosDictionary)container).get(key);
}
if (containerItem == null) continue;
CosObjectInfo itemInfo = containerItem.getInfo();
if (itemInfo != null) {
if (!itemInfo.isDirty() || list.get(itemInfo.getObjNum()) != null) continue;
list.add(containerItem.getInfo().getObjNum(), containerItem.getInfo());
}
if (!(containerItem instanceof CosContainer)) continue;
pushState = true;
break;
}
if (pushState) {
stateStack.add(container);
stateStack.add(containerIter);
container = (CosContainer)containerItem;
continue;
}
if (stateStack.isEmpty()) {
return;
}
containerIter = (Iterator)stateStack.get(stateStack.size() - 1);
stateStack.remove(stateStack.size() - 1);
container = (CosContainer)stateStack.get(stateStack.size() - 1);
stateStack.remove(stateStack.size() - 1);
} while (true);
}
}