739 lines
17 KiB
C++
739 lines
17 KiB
C++
//========================================================================
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//
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// Catalog.cc
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//
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// Copyright 1996-2007 Glyph & Cog, LLC
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//
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//========================================================================
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#include <aconf.h>
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#ifdef USE_GCC_PRAGMAS
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#pragma implementation
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#endif
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#include <string.h>
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#include <stddef.h>
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#include <limits.h>
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#include "gmem.h"
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#include "gfile.h"
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#include "GList.h"
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#include "Object.h"
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#include "CharTypes.h"
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#include "PDFDoc.h"
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#include "XRef.h"
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#include "Array.h"
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#include "Dict.h"
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#include "Page.h"
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#include "Error.h"
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#include "Link.h"
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#include "PDFDocEncoding.h"
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#include "Catalog.h"
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//------------------------------------------------------------------------
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// PageTreeNode
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//------------------------------------------------------------------------
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class PageTreeNode {
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public:
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PageTreeNode(Ref refA, int countA, PageTreeNode *parentA);
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~PageTreeNode();
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Ref ref;
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int count;
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PageTreeNode *parent;
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GList *kids; // [PageTreeNode]
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PageAttrs *attrs;
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};
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PageTreeNode::PageTreeNode(Ref refA, int countA, PageTreeNode *parentA) {
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ref = refA;
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count = countA;
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parent = parentA;
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kids = NULL;
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attrs = NULL;
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}
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PageTreeNode::~PageTreeNode() {
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delete attrs;
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if (kids) {
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deleteGList(kids, PageTreeNode);
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}
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}
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//------------------------------------------------------------------------
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// EmbeddedFile
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//------------------------------------------------------------------------
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class EmbeddedFile {
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public:
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EmbeddedFile(Unicode *nameA, int nameLenA, Object *streamRefA);
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~EmbeddedFile();
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Unicode *name;
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int nameLen;
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Object streamRef;
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};
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EmbeddedFile::EmbeddedFile(Unicode *nameA, int nameLenA,
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Object *streamRefA) {
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name = nameA;
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nameLen = nameLenA;
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streamRefA->copy(&streamRef);
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}
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EmbeddedFile::~EmbeddedFile() {
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gfree(name);
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streamRef.free();
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}
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//------------------------------------------------------------------------
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// Catalog
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//------------------------------------------------------------------------
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Catalog::Catalog(PDFDoc *docA) {
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Object catDict;
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Object obj, obj2;
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ok = gTrue;
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doc = docA;
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xref = doc->getXRef();
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pageTree = NULL;
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pages = NULL;
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pageRefs = NULL;
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numPages = 0;
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baseURI = NULL;
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embeddedFiles = NULL;
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xref->getCatalog(&catDict);
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if (!catDict.isDict()) {
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error(errSyntaxError, -1, "Catalog object is wrong type ({0:s})",
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catDict.getTypeName());
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goto err1;
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}
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// read page tree
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if (!readPageTree(&catDict)) {
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goto err1;
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}
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// read named destination dictionary
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catDict.dictLookup("Dests", &dests);
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// read root of named destination tree
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if (catDict.dictLookup("Names", &obj)->isDict())
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obj.dictLookup("Dests", &nameTree);
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else
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nameTree.initNull();
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obj.free();
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// read base URI
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if (catDict.dictLookup("URI", &obj)->isDict()) {
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if (obj.dictLookup("Base", &obj2)->isString()) {
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baseURI = obj2.getString()->copy();
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}
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obj2.free();
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}
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obj.free();
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if (!baseURI || baseURI->getLength() == 0) {
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if (baseURI) {
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delete baseURI;
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}
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if (doc->getFileName()) {
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baseURI = makePathAbsolute(grabPath(doc->getFileName()->getCString()));
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if (baseURI->getChar(0) == '/') {
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baseURI->insert(0, "file://localhost");
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} else {
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baseURI->insert(0, "file://localhost/");
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}
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} else {
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baseURI = new GString("file://localhost/");
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}
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}
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// get the metadata stream
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catDict.dictLookup("Metadata", &metadata);
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// get the structure tree root
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catDict.dictLookup("StructTreeRoot", &structTreeRoot);
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// get the outline dictionary
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catDict.dictLookup("Outlines", &outline);
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// get the AcroForm dictionary
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catDict.dictLookup("AcroForm", &acroForm);
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// get the OCProperties dictionary
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catDict.dictLookup("OCProperties", &ocProperties);
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// get the list of embedded files
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readEmbeddedFileList(catDict.getDict());
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catDict.free();
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return;
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err1:
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catDict.free();
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dests.initNull();
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nameTree.initNull();
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ok = gFalse;
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}
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Catalog::~Catalog() {
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int i;
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if (pageTree) {
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delete pageTree;
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}
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if (pages) {
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for (i = 0; i < numPages; ++i) {
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if (pages[i]) {
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delete pages[i];
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}
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}
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gfree(pages);
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gfree(pageRefs);
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}
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dests.free();
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nameTree.free();
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if (baseURI) {
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delete baseURI;
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}
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metadata.free();
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structTreeRoot.free();
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outline.free();
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acroForm.free();
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ocProperties.free();
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if (embeddedFiles) {
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deleteGList(embeddedFiles, EmbeddedFile);
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}
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}
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Page *Catalog::getPage(int i) {
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if (!pages[i-1]) {
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loadPage(i);
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}
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return pages[i-1];
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}
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Ref *Catalog::getPageRef(int i) {
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if (!pages[i-1]) {
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loadPage(i);
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}
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return &pageRefs[i-1];
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}
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void Catalog::doneWithPage(int i) {
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if (pages[i-1]) {
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delete pages[i-1];
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pages[i-1] = NULL;
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}
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}
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GString *Catalog::readMetadata() {
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GString *s;
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Dict *dict;
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Object obj;
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int c;
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if (!metadata.isStream()) {
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return NULL;
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}
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dict = metadata.streamGetDict();
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if (!dict->lookup("Subtype", &obj)->isName("XML")) {
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error(errSyntaxWarning, -1, "Unknown Metadata type: '{0:s}'",
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obj.isName() ? obj.getName() : "???");
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}
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obj.free();
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s = new GString();
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metadata.streamReset();
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while ((c = metadata.streamGetChar()) != EOF) {
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s->append(c);
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}
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metadata.streamClose();
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return s;
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}
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int Catalog::findPage(int num, int gen) {
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int i;
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for (i = 0; i < numPages; ++i) {
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if (!pages[i]) {
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loadPage(i+1);
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}
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if (pageRefs[i].num == num && pageRefs[i].gen == gen)
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return i + 1;
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}
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return 0;
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}
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LinkDest *Catalog::findDest(GString *name) {
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LinkDest *dest;
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Object obj1, obj2;
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GBool found;
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// try named destination dictionary then name tree
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found = gFalse;
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if (dests.isDict()) {
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if (!dests.dictLookup(name->getCString(), &obj1)->isNull())
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found = gTrue;
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else
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obj1.free();
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}
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if (!found && nameTree.isDict()) {
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if (!findDestInTree(&nameTree, name, &obj1)->isNull())
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found = gTrue;
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else
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obj1.free();
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}
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if (!found)
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return NULL;
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// construct LinkDest
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dest = NULL;
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if (obj1.isArray()) {
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dest = new LinkDest(obj1.getArray());
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} else if (obj1.isDict()) {
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if (obj1.dictLookup("D", &obj2)->isArray())
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dest = new LinkDest(obj2.getArray());
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else
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error(errSyntaxWarning, -1, "Bad named destination value");
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obj2.free();
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} else {
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error(errSyntaxWarning, -1, "Bad named destination value");
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}
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obj1.free();
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if (dest && !dest->isOk()) {
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delete dest;
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dest = NULL;
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}
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return dest;
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}
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Object *Catalog::findDestInTree(Object *tree, GString *name, Object *obj) {
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Object names, name1;
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Object kids, kid, limits, low, high;
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GBool done, found;
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int cmp, i;
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// leaf node
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if (tree->dictLookup("Names", &names)->isArray()) {
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done = found = gFalse;
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for (i = 0; !done && i < names.arrayGetLength(); i += 2) {
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if (names.arrayGet(i, &name1)->isString()) {
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cmp = name->cmp(name1.getString());
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if (cmp == 0) {
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names.arrayGet(i+1, obj);
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found = gTrue;
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done = gTrue;
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} else if (cmp < 0) {
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done = gTrue;
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}
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}
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name1.free();
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}
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names.free();
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if (!found)
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obj->initNull();
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return obj;
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}
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names.free();
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// root or intermediate node
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done = gFalse;
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if (tree->dictLookup("Kids", &kids)->isArray()) {
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for (i = 0; !done && i < kids.arrayGetLength(); ++i) {
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if (kids.arrayGet(i, &kid)->isDict()) {
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if (kid.dictLookup("Limits", &limits)->isArray()) {
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if (limits.arrayGet(0, &low)->isString() &&
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name->cmp(low.getString()) >= 0) {
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if (limits.arrayGet(1, &high)->isString() &&
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name->cmp(high.getString()) <= 0) {
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findDestInTree(&kid, name, obj);
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done = gTrue;
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}
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high.free();
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}
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low.free();
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}
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limits.free();
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}
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kid.free();
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}
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}
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kids.free();
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// name was outside of ranges of all kids
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if (!done)
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obj->initNull();
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return obj;
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}
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GBool Catalog::readPageTree(Object *catDict) {
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Object topPagesRef, topPagesObj, countObj;
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int i;
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if (!catDict->dictLookupNF("Pages", &topPagesRef)->isRef()) {
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error(errSyntaxError, -1, "Top-level pages reference is wrong type ({0:s})",
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topPagesRef.getTypeName());
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topPagesRef.free();
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return gFalse;
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}
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if (!topPagesRef.fetch(xref, &topPagesObj)->isDict()) {
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error(errSyntaxError, -1, "Top-level pages object is wrong type ({0:s})",
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topPagesObj.getTypeName());
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topPagesObj.free();
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topPagesRef.free();
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return gFalse;
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}
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if (topPagesObj.dictLookup("Count", &countObj)->isInt()) {
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numPages = countObj.getInt();
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if (numPages == 0) {
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// Acrobat apparently scans the page tree if it sees a zero count
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numPages = countPageTree(&topPagesObj);
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}
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} else {
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// assume we got a Page node instead of a Pages node
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numPages = 1;
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}
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countObj.free();
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if (numPages < 0) {
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error(errSyntaxError, -1, "Invalid page count");
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topPagesObj.free();
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topPagesRef.free();
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numPages = 0;
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return gFalse;
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}
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pageTree = new PageTreeNode(topPagesRef.getRef(), numPages, NULL);
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topPagesObj.free();
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topPagesRef.free();
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pages = (Page **)greallocn(pages, numPages, sizeof(Page *));
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pageRefs = (Ref *)greallocn(pageRefs, numPages, sizeof(Ref));
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for (i = 0; i < numPages; ++i) {
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pages[i] = NULL;
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pageRefs[i].num = -1;
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pageRefs[i].gen = -1;
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}
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return gTrue;
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}
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int Catalog::countPageTree(Object *pagesObj) {
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Object kids, kid;
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int n, n2, i;
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if (!pagesObj->isDict()) {
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return 0;
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}
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if (pagesObj->dictLookup("Kids", &kids)->isArray()) {
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n = 0;
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for (i = 0; i < kids.arrayGetLength(); ++i) {
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kids.arrayGet(i, &kid);
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n2 = countPageTree(&kid);
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if (n2 < INT_MAX - n) {
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n += n2;
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} else {
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error(errSyntaxError, -1, "Page tree contains too many pages");
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n = INT_MAX;
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}
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kid.free();
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}
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} else {
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n = 1;
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}
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kids.free();
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return n;
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}
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void Catalog::loadPage(int pg) {
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loadPage2(pg, pg - 1, pageTree);
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}
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void Catalog::loadPage2(int pg, int relPg, PageTreeNode *node) {
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Object pageRefObj, pageObj, kidsObj, kidRefObj, kidObj, countObj;
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PageTreeNode *kidNode, *p;
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PageAttrs *attrs;
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int count, i;
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if (relPg >= node->count) {
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error(errSyntaxError, -1, "Internal error in page tree");
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pages[pg-1] = new Page(doc, pg);
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return;
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}
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// if this node has not been filled in yet, it's either a leaf node
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// or an unread internal node
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if (!node->kids) {
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// check for a loop in the page tree
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for (p = node->parent; p; p = p->parent) {
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if (node->ref.num == p->ref.num && node->ref.gen == p->ref.gen) {
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error(errSyntaxError, -1, "Loop in Pages tree");
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pages[pg-1] = new Page(doc, pg);
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return;
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}
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}
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// fetch the Page/Pages object
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pageRefObj.initRef(node->ref.num, node->ref.gen);
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if (!pageRefObj.fetch(xref, &pageObj)->isDict()) {
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error(errSyntaxError, -1, "Page tree object is wrong type ({0:s})",
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pageObj.getTypeName());
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pageObj.free();
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pageRefObj.free();
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pages[pg-1] = new Page(doc, pg);
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return;
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}
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// merge the PageAttrs
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attrs = new PageAttrs(node->parent ? node->parent->attrs
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: (PageAttrs *)NULL,
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pageObj.getDict());
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// if "Kids" exists, it's an internal node
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if (pageObj.dictLookup("Kids", &kidsObj)->isArray()) {
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// save the PageAttrs
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node->attrs = attrs;
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// read the kids
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node->kids = new GList();
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for (i = 0; i < kidsObj.arrayGetLength(); ++i) {
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if (kidsObj.arrayGetNF(i, &kidRefObj)->isRef()) {
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if (kidRefObj.fetch(xref, &kidObj)->isDict()) {
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if (kidObj.dictLookup("Count", &countObj)->isInt()) {
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count = countObj.getInt();
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} else {
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count = 1;
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}
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countObj.free();
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node->kids->append(new PageTreeNode(kidRefObj.getRef(), count,
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node));
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} else {
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error(errSyntaxError, -1, "Page tree object is wrong type ({0:s})",
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kidObj.getTypeName());
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}
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kidObj.free();
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} else {
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error(errSyntaxError, -1,
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"Page tree reference is wrong type ({0:s})",
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kidRefObj.getTypeName());
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}
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kidRefObj.free();
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}
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} else {
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// create the Page object
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pageRefs[pg-1] = node->ref;
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pages[pg-1] = new Page(doc, pg, pageObj.getDict(), attrs);
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if (!pages[pg-1]->isOk()) {
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delete pages[pg-1];
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pages[pg-1] = new Page(doc, pg);
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}
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}
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kidsObj.free();
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pageObj.free();
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pageRefObj.free();
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}
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// recursively descend the tree
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if (node->kids) {
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for (i = 0; i < node->kids->getLength(); ++i) {
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kidNode = (PageTreeNode *)node->kids->get(i);
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if (relPg < kidNode->count) {
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loadPage2(pg, relPg, kidNode);
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break;
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}
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relPg -= kidNode->count;
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}
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// this will only happen if the page tree is invalid
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// (i.e., parent count > sum of children counts)
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if (i == node->kids->getLength()) {
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error(errSyntaxError, -1, "Invalid page count in page tree");
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pages[pg-1] = new Page(doc, pg);
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}
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}
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}
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|
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void Catalog::readEmbeddedFileList(Dict *catDict) {
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Object obj1, obj2;
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char *touchedObjs;
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|
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// read the embedded file name tree
|
|
if (catDict->lookup("Names", &obj1)->isDict()) {
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if (obj1.dictLookup("EmbeddedFiles", &obj2)->isDict()) {
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readEmbeddedFileTree(&obj2);
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}
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obj2.free();
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}
|
|
obj1.free();
|
|
|
|
// look for file attachment annotations
|
|
touchedObjs = (char *)gmalloc(xref->getNumObjects());
|
|
memset(touchedObjs, 0, xref->getNumObjects());
|
|
readFileAttachmentAnnots(catDict->lookupNF("Pages", &obj1), touchedObjs);
|
|
obj1.free();
|
|
gfree(touchedObjs);
|
|
}
|
|
|
|
void Catalog::readEmbeddedFileTree(Object *node) {
|
|
Object kidsObj, kidObj;
|
|
Object namesObj, nameObj, fileSpecObj;
|
|
int i;
|
|
|
|
if (node->dictLookup("Kids", &kidsObj)->isArray()) {
|
|
for (i = 0; i < kidsObj.arrayGetLength(); ++i) {
|
|
if (kidsObj.arrayGet(i, &kidObj)->isDict()) {
|
|
readEmbeddedFileTree(&kidObj);
|
|
}
|
|
kidObj.free();
|
|
}
|
|
} else {
|
|
if (node->dictLookup("Names", &namesObj)->isArray()) {
|
|
for (i = 0; i+1 < namesObj.arrayGetLength(); ++i) {
|
|
namesObj.arrayGet(i, &nameObj);
|
|
namesObj.arrayGet(i+1, &fileSpecObj);
|
|
readEmbeddedFile(&fileSpecObj, &nameObj);
|
|
nameObj.free();
|
|
fileSpecObj.free();
|
|
}
|
|
}
|
|
namesObj.free();
|
|
}
|
|
kidsObj.free();
|
|
}
|
|
|
|
void Catalog::readFileAttachmentAnnots(Object *pageNodeRef,
|
|
char *touchedObjs) {
|
|
Object pageNode, kids, kid, annots, annot, subtype, fileSpec, contents;
|
|
int i;
|
|
|
|
// check for a page tree loop
|
|
if (pageNodeRef->isRef()) {
|
|
if (touchedObjs[pageNodeRef->getRefNum()]) {
|
|
return;
|
|
}
|
|
touchedObjs[pageNodeRef->getRefNum()] = 1;
|
|
xref->fetch(pageNodeRef->getRefNum(), pageNodeRef->getRefGen(), &pageNode);
|
|
} else {
|
|
pageNodeRef->copy(&pageNode);
|
|
}
|
|
|
|
if (pageNode.isDict()) {
|
|
if (pageNode.dictLookup("Kids", &kids)->isArray()) {
|
|
for (i = 0; i < kids.arrayGetLength(); ++i) {
|
|
readFileAttachmentAnnots(kids.arrayGetNF(i, &kid), touchedObjs);
|
|
kid.free();
|
|
}
|
|
} else {
|
|
if (pageNode.dictLookup("Annots", &annots)->isArray()) {
|
|
for (i = 0; i < annots.arrayGetLength(); ++i) {
|
|
if (annots.arrayGet(i, &annot)->isDict()) {
|
|
if (annot.dictLookup("Subtype", &subtype)
|
|
->isName("FileAttachment")) {
|
|
if (annot.dictLookup("FS", &fileSpec)) {
|
|
readEmbeddedFile(&fileSpec,
|
|
annot.dictLookup("Contents", &contents));
|
|
contents.free();
|
|
}
|
|
fileSpec.free();
|
|
}
|
|
subtype.free();
|
|
}
|
|
annot.free();
|
|
}
|
|
}
|
|
annots.free();
|
|
}
|
|
kids.free();
|
|
}
|
|
|
|
pageNode.free();
|
|
}
|
|
|
|
void Catalog::readEmbeddedFile(Object *fileSpec, Object *name1) {
|
|
Object name2, efObj, streamObj;
|
|
GString *s;
|
|
Unicode *name;
|
|
int nameLen, i;
|
|
|
|
if (fileSpec->isDict()) {
|
|
if (fileSpec->dictLookup("UF", &name2)->isString()) {
|
|
s = name2.getString();
|
|
} else {
|
|
name2.free();
|
|
if (fileSpec->dictLookup("F", &name2)->isString()) {
|
|
s = name2.getString();
|
|
} else if (name1 && name1->isString()) {
|
|
s = name1->getString();
|
|
} else {
|
|
s = NULL;
|
|
}
|
|
}
|
|
if (s) {
|
|
if ((s->getChar(0) & 0xff) == 0xfe &&
|
|
(s->getChar(1) & 0xff) == 0xff) {
|
|
nameLen = (s->getLength() - 2) / 2;
|
|
name = (Unicode *)gmallocn(nameLen, sizeof(Unicode));
|
|
for (i = 0; i < nameLen; ++i) {
|
|
name[i] = ((s->getChar(2 + 2*i) & 0xff) << 8) |
|
|
(s->getChar(3 + 2*i) & 0xff);
|
|
}
|
|
} else {
|
|
nameLen = s->getLength();
|
|
name = (Unicode *)gmallocn(nameLen, sizeof(Unicode));
|
|
for (i = 0; i < nameLen; ++i) {
|
|
name[i] = pdfDocEncoding[s->getChar(i) & 0xff];
|
|
}
|
|
}
|
|
} else {
|
|
nameLen = 1;
|
|
name = (Unicode *)gmallocn(nameLen, sizeof(Unicode));
|
|
name[0] = '?';
|
|
}
|
|
name2.free();
|
|
if (fileSpec->dictLookup("EF", &efObj)->isDict()) {
|
|
if (efObj.dictLookupNF("F", &streamObj)->isRef()) {
|
|
if (!embeddedFiles) {
|
|
embeddedFiles = new GList();
|
|
}
|
|
embeddedFiles->append(new EmbeddedFile(name, nameLen, &streamObj));
|
|
} else {
|
|
gfree(name);
|
|
}
|
|
streamObj.free();
|
|
} else {
|
|
gfree(name);
|
|
}
|
|
efObj.free();
|
|
}
|
|
}
|
|
|
|
int Catalog::getNumEmbeddedFiles() {
|
|
return embeddedFiles ? embeddedFiles->getLength() : 0;
|
|
}
|
|
|
|
Unicode *Catalog::getEmbeddedFileName(int idx) {
|
|
return ((EmbeddedFile *)embeddedFiles->get(idx))->name;
|
|
}
|
|
|
|
int Catalog::getEmbeddedFileNameLength(int idx) {
|
|
return ((EmbeddedFile *)embeddedFiles->get(idx))->nameLen;
|
|
}
|
|
|
|
Object *Catalog::getEmbeddedFileStreamObj(int idx, Object *strObj) {
|
|
((EmbeddedFile *)embeddedFiles->get(idx))->streamRef.fetch(xref, strObj);
|
|
if (!strObj->isStream()) {
|
|
strObj->free();
|
|
return NULL;
|
|
}
|
|
return strObj;
|
|
}
|