The Tor Browser: comparison gfx/skia/trunk/src/pdf/SkPDFCatalog.cpp

--1:000000000000
+:f72d44e4ef8a
+/*
+* Copyright 2010 The Android Open Source Project
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+#include "SkPDFCatalog.h"
+#include "SkPDFTypes.h"
+#include "SkStream.h"
+#include "SkTypes.h"
+SkPDFCatalog::SkPDFCatalog(SkPDFDocument::Flags flags)
+: fFirstPageCount(0),
+fNextObjNum(1),
+fNextFirstPageObjNum(0),
+fDocumentFlags(flags) {
+}
+SkPDFCatalog::~SkPDFCatalog() {
+fSubstituteResourcesRemaining.safeUnrefAll();
+fSubstituteResourcesFirstPage.safeUnrefAll();
+}
+SkPDFObject* SkPDFCatalog::addObject(SkPDFObject* obj, bool onFirstPage) {
+if (findObjectIndex(obj) != -1) {  // object already added
+return obj;
+}
+SkASSERT(fNextFirstPageObjNum == 0);
+if (onFirstPage) {
+fFirstPageCount++;
+}
+struct Rec newEntry(obj, onFirstPage);
+fCatalog.append(1, &newEntry);
+return obj;
+}
+size_t SkPDFCatalog::setFileOffset(SkPDFObject* obj, off_t offset) {
+int objIndex = assignObjNum(obj) - 1;
+SkASSERT(fCatalog[objIndex].fObjNumAssigned);
+SkASSERT(fCatalog[objIndex].fFileOffset == 0);
+fCatalog[objIndex].fFileOffset = offset;
+return getSubstituteObject(obj)->getOutputSize(this, true);
+}
+void SkPDFCatalog::emitObjectNumber(SkWStream* stream, SkPDFObject* obj) {
+stream->writeDecAsText(assignObjNum(obj));
+stream->writeText(" 0");  // Generation number is always 0.
+}
+size_t SkPDFCatalog::getObjectNumberSize(SkPDFObject* obj) {
+SkDynamicMemoryWStream buffer;
+emitObjectNumber(&buffer, obj);
+return buffer.getOffset();
+}
+int SkPDFCatalog::findObjectIndex(SkPDFObject* obj) const {
+for (int i = 0; i < fCatalog.count(); i++) {
+if (fCatalog[i].fObject == obj) {
+return i;
+}
+}
+// If it's not in the main array, check if it's a substitute object.
+for (int i = 0; i < fSubstituteMap.count(); ++i) {
+if (fSubstituteMap[i].fSubstitute == obj) {
+return findObjectIndex(fSubstituteMap[i].fOriginal);
+}
+}
+return -1;
+}
+int SkPDFCatalog::assignObjNum(SkPDFObject* obj) {
+int pos = findObjectIndex(obj);
+// If this assert fails, it means you probably forgot to add an object
+// to the resource list.
+SkASSERT(pos >= 0);
+uint32_t currentIndex = pos;
+if (fCatalog[currentIndex].fObjNumAssigned) {
+return currentIndex + 1;
+}
+// First assignment.
+if (fNextFirstPageObjNum == 0) {
+fNextFirstPageObjNum = fCatalog.count() - fFirstPageCount + 1;
+}
+uint32_t objNum;
+if (fCatalog[currentIndex].fOnFirstPage) {
+objNum = fNextFirstPageObjNum;
+fNextFirstPageObjNum++;
+} else {
+objNum = fNextObjNum;
+fNextObjNum++;
+}
+// When we assign an object an object number, we put it in that array
+// offset (minus 1 because object number 0 is reserved).
+SkASSERT(!fCatalog[objNum - 1].fObjNumAssigned);
+if (objNum - 1 != currentIndex) {
+SkTSwap(fCatalog[objNum - 1], fCatalog[currentIndex]);
+}
+fCatalog[objNum - 1].fObjNumAssigned = true;
+return objNum;
+}
+int32_t SkPDFCatalog::emitXrefTable(SkWStream* stream, bool firstPage) {
+int first = -1;
+int last = fCatalog.count() - 1;
+// TODO(vandebo): Support linearized format.
+// int last = fCatalog.count() - fFirstPageCount - 1;
+// if (firstPage) {
+//     first = fCatalog.count() - fFirstPageCount;
+//     last = fCatalog.count() - 1;
+// }
+stream->writeText("xref\n");
+stream->writeDecAsText(first + 1);
+stream->writeText(" ");
+stream->writeDecAsText(last - first + 1);
+stream->writeText("\n");
+if (first == -1) {
+stream->writeText("0000000000 65535 f \n");
+first++;
+}
+for (int i = first; i <= last; i++) {
+// For 32 bits platforms, the maximum offset has to fit within off_t
+// which is a 32 bits signed integer on these platforms.
+SkDEBUGCODE(static const off_t kMaxOff = SK_MaxS32;)
+SkASSERT(fCatalog[i].fFileOffset > 0);
+SkASSERT(fCatalog[i].fFileOffset < kMaxOff);
+stream->writeBigDecAsText(fCatalog[i].fFileOffset, 10);
+stream->writeText(" 00000 n \n");
+}
+return fCatalog.count() + 1;
+}
+void SkPDFCatalog::setSubstitute(SkPDFObject* original,
+SkPDFObject* substitute) {
+#if defined(SK_DEBUG)
+// Sanity check: is the original already in substitute list?
+for (int i = 0; i < fSubstituteMap.count(); ++i) {
+if (original == fSubstituteMap[i].fSubstitute ||
+original == fSubstituteMap[i].fOriginal) {
+SkASSERT(false);
+return;
+}
+}
+#endif
+// Check if the original is on first page.
+bool onFirstPage = false;
+for (int i = 0; i < fCatalog.count(); ++i) {
+if (fCatalog[i].fObject == original) {
+onFirstPage = fCatalog[i].fOnFirstPage;
+break;
+}
+#if defined(SK_DEBUG)
+if (i == fCatalog.count() - 1) {
+SkASSERT(false);  // original not in catalog
+return;
+}
+#endif
+}
+SubstituteMapping newMapping(original, substitute);
+fSubstituteMap.append(1, &newMapping);
+// Add resource objects of substitute object to catalog.
+SkTSet<SkPDFObject*>* targetSet = getSubstituteList(onFirstPage);
+SkTSet<SkPDFObject*> newResourceObjects;
+newMapping.fSubstitute->getResources(*targetSet, &newResourceObjects);
+for (int i = 0; i < newResourceObjects.count(); ++i) {
+addObject(newResourceObjects[i], onFirstPage);
+}
+// mergeInto returns the number of duplicates.
+// If there are duplicates, there is a bug and we mess ref counting.
+SkDEBUGCODE(int duplicates =) targetSet->mergeInto(newResourceObjects);
+SkASSERT(duplicates == 0);
+}
+SkPDFObject* SkPDFCatalog::getSubstituteObject(SkPDFObject* object) {
+for (int i = 0; i < fSubstituteMap.count(); ++i) {
+if (object == fSubstituteMap[i].fOriginal) {
+return fSubstituteMap[i].fSubstitute;
+}
+}
+return object;
+}
+off_t SkPDFCatalog::setSubstituteResourcesOffsets(off_t fileOffset,
+bool firstPage) {
+SkTSet<SkPDFObject*>* targetSet = getSubstituteList(firstPage);
+off_t offsetSum = fileOffset;
+for (int i = 0; i < targetSet->count(); ++i) {
+offsetSum += setFileOffset((*targetSet)[i], offsetSum);
+}
+return offsetSum - fileOffset;
+}
+void SkPDFCatalog::emitSubstituteResources(SkWStream *stream, bool firstPage) {
+SkTSet<SkPDFObject*>* targetSet = getSubstituteList(firstPage);
+for (int i = 0; i < targetSet->count(); ++i) {
+(*targetSet)[i]->emit(stream, this, true);
+}
+}
+SkTSet<SkPDFObject*>* SkPDFCatalog::getSubstituteList(bool firstPage) {
+return firstPage ? &fSubstituteResourcesFirstPage :
+&fSubstituteResourcesRemaining;
+}

The Tor Browser / file comparison

comparison: gfx/skia/trunk/src/pdf/SkPDFCatalog.cpp

gfx/skia/trunk/src/pdf/SkPDFCatalog.cpp