| //======================================================================== |
| // |
| // PDFDoc.cc |
| // |
| // Copyright 1996-2003 Glyph & Cog, LLC |
| // |
| //======================================================================== |
| |
| //======================================================================== |
| // |
| // Modified under the Poppler project - http://poppler.freedesktop.org |
| // |
| // All changes made under the Poppler project to this file are licensed |
| // under GPL version 2 or later |
| // |
| // Copyright (C) 2005, 2006, 2008 Brad Hards <bradh@frogmouth.net> |
| // Copyright (C) 2005, 2007-2009, 2011-2017 Albert Astals Cid <aacid@kde.org> |
| // Copyright (C) 2008 Julien Rebetez <julienr@svn.gnome.org> |
| // Copyright (C) 2008, 2010 Pino Toscano <pino@kde.org> |
| // Copyright (C) 2008, 2010, 2011 Carlos Garcia Campos <carlosgc@gnome.org> |
| // Copyright (C) 2009 Eric Toombs <ewtoombs@uwaterloo.ca> |
| // Copyright (C) 2009 Kovid Goyal <kovid@kovidgoyal.net> |
| // Copyright (C) 2009, 2011 Axel Struebing <axel.struebing@freenet.de> |
| // Copyright (C) 2010-2012, 2014 Hib Eris <hib@hiberis.nl> |
| // Copyright (C) 2010 Jakub Wilk <jwilk@jwilk.net> |
| // Copyright (C) 2010 Ilya Gorenbein <igorenbein@finjan.com> |
| // Copyright (C) 2010 Srinivas Adicherla <srinivas.adicherla@geodesic.com> |
| // Copyright (C) 2010 Philip Lorenz <lorenzph+freedesktop@gmail.com> |
| // Copyright (C) 2011-2016 Thomas Freitag <Thomas.Freitag@alfa.de> |
| // Copyright (C) 2012, 2013 Fabio D'Urso <fabiodurso@hotmail.it> |
| // Copyright (C) 2013, 2014, 2017 Adrian Johnson <ajohnson@redneon.com> |
| // Copyright (C) 2013 Adam Reichold <adamreichold@myopera.com> |
| // Copyright (C) 2014 Bogdan Cristea <cristeab@gmail.com> |
| // Copyright (C) 2015 Li Junling <lijunling@sina.com> |
| // Copyright (C) 2015 André Guerreiro <aguerreiro1985@gmail.com> |
| // Copyright (C) 2015 André Esser <bepandre@hotmail.com> |
| // Copyright (C) 2016 Jakub Alba <jakubalba@gmail.com> |
| // |
| // To see a description of the changes please see the Changelog file that |
| // came with your tarball or type make ChangeLog if you are building from git |
| // |
| //======================================================================== |
| |
| #include <config.h> |
| |
| #ifdef USE_GCC_PRAGMAS |
| #pragma implementation |
| #endif |
| |
| #include <ctype.h> |
| #include <locale.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include <limits.h> |
| #include <stdlib.h> |
| #include <stddef.h> |
| #include <string.h> |
| #include <time.h> |
| #include <sys/stat.h> |
| #include "goo/gstrtod.h" |
| #include "goo/GooString.h" |
| #include "goo/gfile.h" |
| #include "poppler-config.h" |
| #include "GlobalParams.h" |
| #include "Page.h" |
| #include "Catalog.h" |
| #include "Stream.h" |
| #include "XRef.h" |
| #include "Linearization.h" |
| #include "Link.h" |
| #include "OutputDev.h" |
| #include "Error.h" |
| #include "ErrorCodes.h" |
| #include "Lexer.h" |
| #include "Parser.h" |
| #include "SecurityHandler.h" |
| #include "Decrypt.h" |
| #ifndef DISABLE_OUTLINE |
| #include "Outline.h" |
| #endif |
| #include "PDFDoc.h" |
| #include "Hints.h" |
| |
| #ifdef MULTITHREADED |
| # define pdfdocLocker() MutexLocker locker(&mutex) |
| #else |
| # define pdfdocLocker() |
| #endif |
| |
| //------------------------------------------------------------------------ |
| |
| #define headerSearchSize 1024 // read this many bytes at beginning of |
| // file to look for '%PDF' |
| #define pdfIdLength 32 // PDF Document IDs (PermanentId, UpdateId) length |
| |
| #define linearizationSearchSize 1024 // read this many bytes at beginning of |
| // file to look for linearization |
| // dictionary |
| |
| #define xrefSearchSize 1024 // read this many bytes at end of file |
| // to look for 'startxref' |
| |
| //------------------------------------------------------------------------ |
| // PDFDoc |
| //------------------------------------------------------------------------ |
| |
| void PDFDoc::init() |
| { |
| #ifdef MULTITHREADED |
| gInitMutex(&mutex); |
| #endif |
| ok = gFalse; |
| errCode = errNone; |
| fileName = NULL; |
| file = NULL; |
| str = NULL; |
| xref = NULL; |
| linearization = NULL; |
| catalog = NULL; |
| hints = NULL; |
| #ifndef DISABLE_OUTLINE |
| outline = NULL; |
| #endif |
| startXRefPos = -1; |
| secHdlr = NULL; |
| pageCache = NULL; |
| } |
| |
| PDFDoc::PDFDoc() |
| { |
| init(); |
| } |
| |
| PDFDoc::PDFDoc(GooString *fileNameA, GooString *ownerPassword, |
| GooString *userPassword, void *guiDataA) { |
| #ifdef _WIN32 |
| int n, i; |
| #endif |
| |
| init(); |
| |
| fileName = fileNameA; |
| guiData = guiDataA; |
| #ifdef _WIN32 |
| n = fileName->getLength(); |
| fileNameU = (wchar_t *)gmallocn(n + 1, sizeof(wchar_t)); |
| for (i = 0; i < n; ++i) { |
| fileNameU[i] = (wchar_t)(fileName->getChar(i) & 0xff); |
| } |
| fileNameU[n] = L'\0'; |
| #endif |
| |
| // try to open file |
| file = GooFile::open(fileName); |
| if (file == NULL) { |
| // fopen() has failed. |
| // Keep a copy of the errno returned by fopen so that it can be |
| // referred to later. |
| fopenErrno = errno; |
| error(errIO, -1, "Couldn't open file '{0:t}': {1:s}.", fileName, strerror(errno)); |
| errCode = errOpenFile; |
| return; |
| } |
| |
| // create stream |
| str = new FileStream(file, 0, gFalse, file->size(), Object(objNull)); |
| |
| ok = setup(ownerPassword, userPassword); |
| } |
| |
| #ifdef _WIN32 |
| PDFDoc::PDFDoc(wchar_t *fileNameA, int fileNameLen, GooString *ownerPassword, |
| GooString *userPassword, void *guiDataA) { |
| OSVERSIONINFO version; |
| int i; |
| |
| init(); |
| |
| guiData = guiDataA; |
| |
| // save both Unicode and 8-bit copies of the file name |
| fileName = new GooString(); |
| fileNameU = (wchar_t *)gmallocn(fileNameLen + 1, sizeof(wchar_t)); |
| for (i = 0; i < fileNameLen; ++i) { |
| fileName->append((char)fileNameA[i]); |
| fileNameU[i] = fileNameA[i]; |
| } |
| fileNameU[fileNameLen] = L'\0'; |
| |
| // try to open file |
| // NB: _wfopen is only available in NT |
| version.dwOSVersionInfoSize = sizeof(version); |
| GetVersionEx(&version); |
| if (version.dwPlatformId == VER_PLATFORM_WIN32_NT) { |
| file = GooFile::open(fileNameU); |
| } else { |
| file = GooFile::open(fileName); |
| } |
| if (!file) { |
| error(errIO, -1, "Couldn't open file '{0:t}'", fileName); |
| errCode = errOpenFile; |
| return; |
| } |
| |
| // create stream |
| str = new FileStream(file, 0, gFalse, file->size(), Object(objNull)); |
| |
| ok = setup(ownerPassword, userPassword); |
| } |
| #endif |
| |
| PDFDoc::PDFDoc(BaseStream *strA, GooString *ownerPassword, |
| GooString *userPassword, void *guiDataA) { |
| #ifdef _WIN32 |
| int n, i; |
| #endif |
| |
| init(); |
| guiData = guiDataA; |
| if (strA->getFileName()) { |
| fileName = strA->getFileName()->copy(); |
| #ifdef _WIN32 |
| n = fileName->getLength(); |
| fileNameU = (wchar_t *)gmallocn(n + 1, sizeof(wchar_t)); |
| for (i = 0; i < n; ++i) { |
| fileNameU[i] = (wchar_t)(fileName->getChar(i) & 0xff); |
| } |
| fileNameU[n] = L'\0'; |
| #endif |
| } else { |
| fileName = NULL; |
| #ifdef _WIN32 |
| fileNameU = NULL; |
| #endif |
| } |
| str = strA; |
| ok = setup(ownerPassword, userPassword); |
| } |
| |
| GBool PDFDoc::setup(GooString *ownerPassword, GooString *userPassword) { |
| pdfdocLocker(); |
| str->setPos(0, -1); |
| if (str->getPos() < 0) |
| { |
| error(errSyntaxError, -1, "Document base stream is not seekable"); |
| return gFalse; |
| } |
| |
| str->reset(); |
| |
| // check footer |
| // Adobe does not seem to enforce %%EOF, so we do the same |
| // if (!checkFooter()) return gFalse; |
| |
| // check header |
| checkHeader(); |
| |
| GBool wasReconstructed = false; |
| |
| // read xref table |
| xref = new XRef(str, getStartXRef(), getMainXRefEntriesOffset(), &wasReconstructed); |
| if (!xref->isOk()) { |
| if (wasReconstructed) { |
| delete xref; |
| startXRefPos = -1; |
| xref = new XRef(str, getStartXRef(gTrue), getMainXRefEntriesOffset(gTrue), &wasReconstructed); |
| } |
| if (!xref->isOk()) { |
| error(errSyntaxError, -1, "Couldn't read xref table"); |
| errCode = xref->getErrorCode(); |
| return gFalse; |
| } |
| } |
| |
| // check for encryption |
| if (!checkEncryption(ownerPassword, userPassword)) { |
| errCode = errEncrypted; |
| return gFalse; |
| } |
| |
| // read catalog |
| catalog = new Catalog(this); |
| if (catalog && !catalog->isOk()) { |
| if (!wasReconstructed) |
| { |
| // try one more time to contruct the Catalog, maybe the problem is damaged XRef |
| delete catalog; |
| delete xref; |
| xref = new XRef(str, 0, 0, NULL, true); |
| catalog = new Catalog(this); |
| } |
| |
| if (catalog && !catalog->isOk()) { |
| error(errSyntaxError, -1, "Couldn't read page catalog"); |
| errCode = errBadCatalog; |
| return gFalse; |
| } |
| } |
| |
| // done |
| return gTrue; |
| } |
| |
| PDFDoc::~PDFDoc() { |
| if (pageCache) { |
| for (int i = 0; i < getNumPages(); i++) { |
| if (pageCache[i]) { |
| delete pageCache[i]; |
| } |
| } |
| gfree(pageCache); |
| } |
| delete secHdlr; |
| #ifndef DISABLE_OUTLINE |
| if (outline) { |
| delete outline; |
| } |
| #endif |
| if (catalog) { |
| delete catalog; |
| } |
| if (xref) { |
| delete xref; |
| } |
| if (hints) { |
| delete hints; |
| } |
| if (linearization) { |
| delete linearization; |
| } |
| if (str) { |
| delete str; |
| } |
| if (file) { |
| delete file; |
| } |
| if (fileName) { |
| delete fileName; |
| } |
| #ifdef _WIN32 |
| if (fileNameU) { |
| gfree(fileNameU); |
| } |
| #endif |
| #ifdef MULTITHREADED |
| gDestroyMutex(&mutex); |
| #endif |
| } |
| |
| |
| // Check for a %%EOF at the end of this stream |
| GBool PDFDoc::checkFooter() { |
| // we look in the last 1024 chars because Adobe does the same |
| char *eof = new char[1025]; |
| Goffset pos = str->getPos(); |
| str->setPos(1024, -1); |
| int i, ch; |
| for (i = 0; i < 1024; i++) |
| { |
| ch = str->getChar(); |
| if (ch == EOF) |
| break; |
| eof[i] = ch; |
| } |
| eof[i] = '\0'; |
| |
| bool found = false; |
| for (i = i - 5; i >= 0; i--) { |
| if (strncmp (&eof[i], "%%EOF", 5) == 0) { |
| found = true; |
| break; |
| } |
| } |
| if (!found) |
| { |
| error(errSyntaxError, -1, "Document has not the mandatory ending %%EOF"); |
| errCode = errDamaged; |
| delete[] eof; |
| return gFalse; |
| } |
| delete[] eof; |
| str->setPos(pos); |
| return gTrue; |
| } |
| |
| // Check for a PDF header on this stream. Skip past some garbage |
| // if necessary. |
| void PDFDoc::checkHeader() { |
| char hdrBuf[headerSearchSize+1]; |
| char *p; |
| char *tokptr; |
| int i; |
| |
| pdfMajorVersion = 0; |
| pdfMinorVersion = 0; |
| for (i = 0; i < headerSearchSize; ++i) { |
| hdrBuf[i] = str->getChar(); |
| } |
| hdrBuf[headerSearchSize] = '\0'; |
| for (i = 0; i < headerSearchSize - 5; ++i) { |
| if (!strncmp(&hdrBuf[i], "%PDF-", 5)) { |
| break; |
| } |
| } |
| if (i >= headerSearchSize - 5) { |
| error(errSyntaxWarning, -1, "May not be a PDF file (continuing anyway)"); |
| return; |
| } |
| str->moveStart(i); |
| if (!(p = strtok_r(&hdrBuf[i+5], " \t\n\r", &tokptr))) { |
| error(errSyntaxWarning, -1, "May not be a PDF file (continuing anyway)"); |
| return; |
| } |
| sscanf(p, "%d.%d", &pdfMajorVersion, &pdfMinorVersion); |
| // We don't do the version check. Don't add it back in. |
| } |
| |
| GBool PDFDoc::checkEncryption(GooString *ownerPassword, GooString *userPassword) { |
| GBool encrypted; |
| GBool ret; |
| |
| Object encrypt = xref->getTrailerDict()->dictLookup("Encrypt"); |
| if ((encrypted = encrypt.isDict())) { |
| if ((secHdlr = SecurityHandler::make(this, &encrypt))) { |
| if (secHdlr->isUnencrypted()) { |
| // no encryption |
| ret = gTrue; |
| } else if (secHdlr->checkEncryption(ownerPassword, userPassword)) { |
| // authorization succeeded |
| xref->setEncryption(secHdlr->getPermissionFlags(), |
| secHdlr->getOwnerPasswordOk(), |
| secHdlr->getFileKey(), |
| secHdlr->getFileKeyLength(), |
| secHdlr->getEncVersion(), |
| secHdlr->getEncRevision(), |
| secHdlr->getEncAlgorithm()); |
| ret = gTrue; |
| } else { |
| // authorization failed |
| ret = gFalse; |
| } |
| } else { |
| // couldn't find the matching security handler |
| ret = gFalse; |
| } |
| } else { |
| // document is not encrypted |
| ret = gTrue; |
| } |
| return ret; |
| } |
| |
| std::vector<FormWidgetSignature*> PDFDoc::getSignatureWidgets() |
| { |
| int num_pages = getNumPages(); |
| FormPageWidgets *page_widgets = NULL; |
| std::vector<FormWidgetSignature*> widget_vector; |
| |
| for (int i = 1; i <= num_pages; i++) { |
| Page *p = getCatalog()->getPage(i); |
| if (p) { |
| page_widgets = p->getFormWidgets(); |
| for (int j = 0; page_widgets != NULL && j < page_widgets->getNumWidgets(); j++) { |
| if (page_widgets->getWidget(j)->getType() == formSignature) { |
| widget_vector.push_back(static_cast<FormWidgetSignature*>(page_widgets->getWidget(j))); |
| } |
| } |
| delete page_widgets; |
| } |
| } |
| return widget_vector; |
| } |
| |
| void PDFDoc::displayPage(OutputDev *out, int page, |
| double hDPI, double vDPI, int rotate, |
| GBool useMediaBox, GBool crop, GBool printing, |
| GBool (*abortCheckCbk)(void *data), |
| void *abortCheckCbkData, |
| GBool (*annotDisplayDecideCbk)(Annot *annot, void *user_data), |
| void *annotDisplayDecideCbkData, GBool copyXRef) { |
| if (globalParams->getPrintCommands()) { |
| printf("***** page %d *****\n", page); |
| } |
| |
| if (getPage(page)) |
| getPage(page)->display(out, hDPI, vDPI, |
| rotate, useMediaBox, crop, printing, |
| abortCheckCbk, abortCheckCbkData, |
| annotDisplayDecideCbk, annotDisplayDecideCbkData, copyXRef); |
| |
| } |
| |
| void PDFDoc::displayPages(OutputDev *out, int firstPage, int lastPage, |
| double hDPI, double vDPI, int rotate, |
| GBool useMediaBox, GBool crop, GBool printing, |
| GBool (*abortCheckCbk)(void *data), |
| void *abortCheckCbkData, |
| GBool (*annotDisplayDecideCbk)(Annot *annot, void *user_data), |
| void *annotDisplayDecideCbkData) { |
| int page; |
| |
| for (page = firstPage; page <= lastPage; ++page) { |
| displayPage(out, page, hDPI, vDPI, rotate, useMediaBox, crop, printing, |
| abortCheckCbk, abortCheckCbkData, |
| annotDisplayDecideCbk, annotDisplayDecideCbkData); |
| } |
| } |
| |
| void PDFDoc::displayPageSlice(OutputDev *out, int page, |
| double hDPI, double vDPI, int rotate, |
| GBool useMediaBox, GBool crop, GBool printing, |
| int sliceX, int sliceY, int sliceW, int sliceH, |
| GBool (*abortCheckCbk)(void *data), |
| void *abortCheckCbkData, |
| GBool (*annotDisplayDecideCbk)(Annot *annot, void *user_data), |
| void *annotDisplayDecideCbkData, GBool copyXRef) { |
| if (getPage(page)) |
| getPage(page)->displaySlice(out, hDPI, vDPI, |
| rotate, useMediaBox, crop, |
| sliceX, sliceY, sliceW, sliceH, |
| printing, |
| abortCheckCbk, abortCheckCbkData, |
| annotDisplayDecideCbk, annotDisplayDecideCbkData, copyXRef); |
| } |
| |
| Links *PDFDoc::getLinks(int page) { |
| Page *p = getPage(page); |
| if (!p) { |
| return new Links (NULL); |
| } |
| return p->getLinks(); |
| } |
| |
| void PDFDoc::processLinks(OutputDev *out, int page) { |
| if (getPage(page)) |
| getPage(page)->processLinks(out); |
| } |
| |
| Linearization *PDFDoc::getLinearization() |
| { |
| if (!linearization) { |
| linearization = new Linearization(str); |
| linearizationState = 0; |
| } |
| return linearization; |
| } |
| |
| GBool PDFDoc::checkLinearization() { |
| if (linearization == NULL) |
| return gFalse; |
| if (linearizationState == 1) |
| return gTrue; |
| if (linearizationState == 2) |
| return gFalse; |
| if (!hints) { |
| hints = new Hints(str, linearization, getXRef(), secHdlr); |
| } |
| if (!hints->isOk()) { |
| linearizationState = 2; |
| return gFalse; |
| } |
| for (int page = 1; page <= linearization->getNumPages(); page++) { |
| Ref pageRef; |
| |
| pageRef.num = hints->getPageObjectNum(page); |
| if (!pageRef.num) { |
| linearizationState = 2; |
| return gFalse; |
| } |
| |
| // check for bogus ref - this can happen in corrupted PDF files |
| if (pageRef.num < 0 || pageRef.num >= xref->getNumObjects()) { |
| linearizationState = 2; |
| return gFalse; |
| } |
| |
| pageRef.gen = xref->getEntry(pageRef.num)->gen; |
| Object obj = xref->fetch(pageRef.num, pageRef.gen); |
| if (!obj.isDict("Page")) { |
| linearizationState = 2; |
| return gFalse; |
| } |
| } |
| linearizationState = 1; |
| return gTrue; |
| } |
| |
| GBool PDFDoc::isLinearized(GBool tryingToReconstruct) { |
| if ((str->getLength()) && |
| (getLinearization()->getLength() == str->getLength())) |
| return gTrue; |
| else { |
| if (tryingToReconstruct) |
| return getLinearization()->getLength() > 0; |
| else |
| return gFalse; |
| } |
| } |
| |
| void PDFDoc::setDocInfoModified(Object *infoObj) |
| { |
| Object infoObjRef = getDocInfoNF(); |
| xref->setModifiedObject(infoObj, infoObjRef.getRef()); |
| } |
| |
| void PDFDoc::setDocInfoStringEntry(const char *key, GooString *value) |
| { |
| GBool removeEntry = !value || value->getLength() == 0 || value->hasJustUnicodeMarker(); |
| if (removeEntry) { |
| delete value; |
| } |
| |
| Object infoObj = getDocInfo(); |
| if (infoObj.isNull() && removeEntry) { |
| // No info dictionary, so no entry to remove. |
| return; |
| } |
| |
| infoObj = createDocInfoIfNoneExists(); |
| if (removeEntry) { |
| infoObj.dictSet(key, Object(objNull)); |
| } else { |
| infoObj.dictSet(key, Object(value)); |
| } |
| |
| |
| if (infoObj.dictGetLength() == 0) { |
| // Info dictionary is empty. Remove it altogether. |
| removeDocInfo(); |
| } else { |
| setDocInfoModified(&infoObj); |
| } |
| } |
| |
| GooString *PDFDoc::getDocInfoStringEntry(const char *key) { |
| Object infoObj = getDocInfo(); |
| if (!infoObj.isDict()) { |
| return NULL; |
| } |
| |
| Object entryObj = infoObj.dictLookup(key); |
| |
| GooString *result; |
| |
| if (entryObj.isString()) { |
| result = entryObj.takeString(); |
| } else { |
| result = NULL; |
| } |
| |
| return result; |
| } |
| |
| static GBool |
| get_id (GooString *encodedidstring, GooString *id) { |
| const char *encodedid = encodedidstring->getCString(); |
| char pdfid[pdfIdLength + 1]; |
| int n; |
| |
| if (encodedidstring->getLength() != pdfIdLength / 2) |
| return gFalse; |
| |
| n = sprintf(pdfid, "%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x", |
| encodedid[0] & 0xff, encodedid[1] & 0xff, encodedid[2] & 0xff, encodedid[3] & 0xff, |
| encodedid[4] & 0xff, encodedid[5] & 0xff, encodedid[6] & 0xff, encodedid[7] & 0xff, |
| encodedid[8] & 0xff, encodedid[9] & 0xff, encodedid[10] & 0xff, encodedid[11] & 0xff, |
| encodedid[12] & 0xff, encodedid[13] & 0xff, encodedid[14] & 0xff, encodedid[15] & 0xff); |
| if (n != pdfIdLength) |
| return gFalse; |
| |
| id->Set(pdfid, pdfIdLength); |
| return gTrue; |
| } |
| |
| GBool PDFDoc::getID(GooString *permanent_id, GooString *update_id) { |
| Object obj = xref->getTrailerDict()->dictLookup ("ID"); |
| |
| if (obj.isArray() && obj.arrayGetLength() == 2) { |
| if (permanent_id) { |
| Object obj2 = obj.arrayGet(0); |
| if (obj2.isString()) { |
| if (!get_id (obj2.getString(), permanent_id)) { |
| return gFalse; |
| } |
| } else { |
| error(errSyntaxError, -1, "Invalid permanent ID"); |
| return gFalse; |
| } |
| } |
| |
| if (update_id) { |
| Object obj2 = obj.arrayGet(1); |
| if (obj2.isString()) { |
| if (!get_id (obj2.getString(), update_id)) { |
| return gFalse; |
| } |
| } else { |
| error(errSyntaxError, -1, "Invalid update ID"); |
| return gFalse; |
| } |
| } |
| |
| return gTrue; |
| } |
| |
| return gFalse; |
| } |
| |
| Hints *PDFDoc::getHints() |
| { |
| if (!hints && isLinearized()) { |
| hints = new Hints(str, getLinearization(), getXRef(), secHdlr); |
| } |
| |
| return hints; |
| } |
| |
| int PDFDoc::savePageAs(GooString *name, int pageNo) |
| { |
| FILE *f; |
| OutStream *outStr; |
| XRef *yRef, *countRef; |
| int rootNum = getXRef()->getNumObjects() + 1; |
| |
| // Make sure that special flags are set, because we are going to read |
| // all objects, including Unencrypted ones. |
| xref->scanSpecialFlags(); |
| |
| Guchar *fileKey; |
| CryptAlgorithm encAlgorithm; |
| int keyLength; |
| xref->getEncryptionParameters(&fileKey, &encAlgorithm, &keyLength); |
| |
| if (pageNo < 1 || pageNo > getNumPages() || !getCatalog()->getPage(pageNo)) { |
| error(errInternal, -1, "Illegal pageNo: {0:d}({1:d})", pageNo, getNumPages() ); |
| return errOpenFile; |
| } |
| PDFRectangle *cropBox = NULL; |
| if (getCatalog()->getPage(pageNo)->isCropped()) { |
| cropBox = getCatalog()->getPage(pageNo)->getCropBox(); |
| } |
| replacePageDict(pageNo, |
| getCatalog()->getPage(pageNo)->getRotate(), |
| getCatalog()->getPage(pageNo)->getMediaBox(), |
| cropBox); |
| Ref *refPage = getCatalog()->getPageRef(pageNo); |
| Object page = getXRef()->fetch(refPage->num, refPage->gen); |
| |
| if (!(f = fopen(name->getCString(), "wb"))) { |
| error(errIO, -1, "Couldn't open file '{0:t}'", name); |
| return errOpenFile; |
| } |
| outStr = new FileOutStream(f,0); |
| |
| yRef = new XRef(getXRef()->getTrailerDict()); |
| |
| if (secHdlr != NULL && !secHdlr->isUnencrypted()) { |
| yRef->setEncryption(secHdlr->getPermissionFlags(), |
| secHdlr->getOwnerPasswordOk(), fileKey, keyLength, secHdlr->getEncVersion(), secHdlr->getEncRevision(), encAlgorithm); |
| } |
| countRef = new XRef(); |
| Object *trailerObj = getXRef()->getTrailerDict(); |
| if (trailerObj->isDict()) { |
| markPageObjects(trailerObj->getDict(), yRef, countRef, 0, refPage->num, rootNum + 2); |
| } |
| yRef->add(0, 65535, 0, gFalse); |
| writeHeader(outStr, getPDFMajorVersion(), getPDFMinorVersion()); |
| |
| // get and mark info dict |
| Object infoObj = getXRef()->getDocInfo(); |
| if (infoObj.isDict()) { |
| Dict *infoDict = infoObj.getDict(); |
| markPageObjects(infoDict, yRef, countRef, 0, refPage->num, rootNum + 2); |
| if (trailerObj->isDict()) { |
| Dict *trailerDict = trailerObj->getDict(); |
| Object ref = trailerDict->lookupNF("Info"); |
| if (ref.isRef()) { |
| yRef->add(ref.getRef().num, ref.getRef().gen, 0, gTrue); |
| if (getXRef()->getEntry(ref.getRef().num)->type == xrefEntryCompressed) { |
| yRef->getEntry(ref.getRef().num)->type = xrefEntryCompressed; |
| } |
| } |
| } |
| } |
| |
| // get and mark output intents etc. |
| Object catObj = getXRef()->getCatalog(); |
| Dict *catDict = catObj.getDict(); |
| Object pagesObj = catDict->lookup("Pages"); |
| Object afObj = catDict->lookupNF("AcroForm"); |
| if (!afObj.isNull()) { |
| markAcroForm(&afObj, yRef, countRef, 0, refPage->num, rootNum + 2); |
| } |
| Dict *pagesDict = pagesObj.getDict(); |
| Object resourcesObj = pagesDict->lookup("Resources"); |
| if (resourcesObj.isDict()) |
| markPageObjects(resourcesObj.getDict(), yRef, countRef, 0, refPage->num, rootNum + 2); |
| markPageObjects(catDict, yRef, countRef, 0, refPage->num, rootNum + 2); |
| |
| Dict *pageDict = page.getDict(); |
| if (resourcesObj.isNull() && !pageDict->hasKey("Resources")) { |
| Object *resourceDictObject = getCatalog()->getPage(pageNo)->getResourceDictObject(); |
| if (resourceDictObject->isDict()) { |
| resourcesObj = resourceDictObject->copy(); |
| markPageObjects(resourcesObj.getDict(), yRef, countRef, 0, refPage->num, rootNum + 2); |
| } |
| } |
| markPageObjects(pageDict, yRef, countRef, 0, refPage->num, rootNum + 2); |
| Object annotsObj = pageDict->lookupNF("Annots"); |
| if (!annotsObj.isNull()) { |
| markAnnotations(&annotsObj, yRef, countRef, 0, refPage->num, rootNum + 2); |
| } |
| yRef->markUnencrypted(); |
| writePageObjects(outStr, yRef, 0); |
| |
| yRef->add(rootNum,0,outStr->getPos(),gTrue); |
| outStr->printf("%d 0 obj\n", rootNum); |
| outStr->printf("<< /Type /Catalog /Pages %d 0 R", rootNum + 1); |
| for (int j = 0; j < catDict->getLength(); j++) { |
| const char *key = catDict->getKey(j); |
| if (strcmp(key, "Type") != 0 && |
| strcmp(key, "Catalog") != 0 && |
| strcmp(key, "Pages") != 0) |
| { |
| if (j > 0) outStr->printf(" "); |
| Object value = catDict->getValNF(j); |
| outStr->printf("/%s ", key); |
| writeObject(&value, outStr, getXRef(), 0, NULL, cryptRC4, 0, 0, 0); |
| } |
| } |
| outStr->printf(">>\nendobj\n"); |
| |
| yRef->add(rootNum + 1,0,outStr->getPos(),gTrue); |
| outStr->printf("%d 0 obj\n", rootNum + 1); |
| outStr->printf("<< /Type /Pages /Kids [ %d 0 R ] /Count 1 ", rootNum + 2); |
| if (resourcesObj.isDict()) { |
| outStr->printf("/Resources "); |
| writeObject(&resourcesObj, outStr, getXRef(), 0, NULL, cryptRC4, 0, 0, 0); |
| } |
| outStr->printf(">>\n"); |
| outStr->printf("endobj\n"); |
| |
| yRef->add(rootNum + 2,0,outStr->getPos(),gTrue); |
| outStr->printf("%d 0 obj\n", rootNum + 2); |
| outStr->printf("<< "); |
| for (int n = 0; n < pageDict->getLength(); n++) { |
| if (n > 0) outStr->printf(" "); |
| const char *key = pageDict->getKey(n); |
| Object value = pageDict->getValNF(n); |
| if (strcmp(key, "Parent") == 0) { |
| outStr->printf("/Parent %d 0 R", rootNum + 1); |
| } else { |
| outStr->printf("/%s ", key); |
| writeObject(&value, outStr, getXRef(), 0, NULL, cryptRC4, 0, 0, 0); |
| } |
| } |
| outStr->printf(" >>\nendobj\n"); |
| |
| Goffset uxrefOffset = outStr->getPos(); |
| Ref ref; |
| ref.num = rootNum; |
| ref.gen = 0; |
| Object trailerDict = createTrailerDict(rootNum + 3, gFalse, 0, &ref, getXRef(), |
| name->getCString(), uxrefOffset); |
| writeXRefTableTrailer(std::move(trailerDict), yRef, gFalse /* do not write unnecessary entries */, |
| uxrefOffset, outStr, getXRef()); |
| |
| outStr->close(); |
| fclose(f); |
| delete yRef; |
| delete countRef; |
| delete outStr; |
| |
| return errNone; |
| } |
| |
| int PDFDoc::saveAs(GooString *name, PDFWriteMode mode) { |
| FILE *f; |
| OutStream *outStr; |
| int res; |
| |
| if (!(f = fopen(name->getCString(), "wb"))) { |
| error(errIO, -1, "Couldn't open file '{0:t}'", name); |
| return errOpenFile; |
| } |
| outStr = new FileOutStream(f,0); |
| res = saveAs(outStr, mode); |
| delete outStr; |
| fclose(f); |
| return res; |
| } |
| |
| int PDFDoc::saveAs(OutStream *outStr, PDFWriteMode mode) { |
| if (!xref->isModified() && mode == writeStandard) { |
| // simply copy the original file |
| saveWithoutChangesAs (outStr); |
| } else if (mode == writeForceRewrite) { |
| saveCompleteRewrite(outStr); |
| } else { |
| saveIncrementalUpdate(outStr); |
| } |
| |
| return errNone; |
| } |
| |
| int PDFDoc::saveWithoutChangesAs(GooString *name) { |
| FILE *f; |
| OutStream *outStr; |
| int res; |
| |
| if (!(f = fopen(name->getCString(), "wb"))) { |
| error(errIO, -1, "Couldn't open file '{0:t}'", name); |
| return errOpenFile; |
| } |
| |
| outStr = new FileOutStream(f,0); |
| res = saveWithoutChangesAs(outStr); |
| delete outStr; |
| |
| fclose(f); |
| |
| return res; |
| } |
| |
| int PDFDoc::saveWithoutChangesAs(OutStream *outStr) { |
| int c; |
| |
| BaseStream *copyStr = str->copy(); |
| copyStr->reset(); |
| while ((c = copyStr->getChar()) != EOF) { |
| outStr->put(c); |
| } |
| copyStr->close(); |
| delete copyStr; |
| |
| return errNone; |
| } |
| |
| void PDFDoc::saveIncrementalUpdate (OutStream* outStr) |
| { |
| XRef *uxref; |
| int c; |
| //copy the original file |
| BaseStream *copyStr = str->copy(); |
| copyStr->reset(); |
| while ((c = copyStr->getChar()) != EOF) { |
| outStr->put(c); |
| } |
| copyStr->close(); |
| delete copyStr; |
| |
| Guchar *fileKey; |
| CryptAlgorithm encAlgorithm; |
| int keyLength; |
| xref->getEncryptionParameters(&fileKey, &encAlgorithm, &keyLength); |
| |
| uxref = new XRef(); |
| uxref->add(0, 65535, 0, gFalse); |
| xref->lock(); |
| for(int i=0; i<xref->getNumObjects(); i++) { |
| if ((xref->getEntry(i)->type == xrefEntryFree) && |
| (xref->getEntry(i)->gen == 0)) //we skip the irrelevant free objects |
| continue; |
| |
| if (xref->getEntry(i)->getFlag(XRefEntry::Updated)) { //we have an updated object |
| Ref ref; |
| ref.num = i; |
| ref.gen = xref->getEntry(i)->type == xrefEntryCompressed ? 0 : xref->getEntry(i)->gen; |
| if (xref->getEntry(i)->type != xrefEntryFree) { |
| Object obj1 = xref->fetch(ref.num, ref.gen, 1); |
| Goffset offset = writeObjectHeader(&ref, outStr); |
| writeObject(&obj1, outStr, fileKey, encAlgorithm, keyLength, ref.num, ref.gen); |
| writeObjectFooter(outStr); |
| uxref->add(ref.num, ref.gen, offset, gTrue); |
| } else { |
| uxref->add(ref.num, ref.gen, 0, gFalse); |
| } |
| } |
| } |
| xref->unlock(); |
| // because of "uxref->add(0, 65535, 0, gFalse);" uxref->getNumObjects() will |
| // always be >= 1; if it is 1, it means there is nothing to update |
| if (uxref->getNumObjects() == 1) { |
| delete uxref; |
| return; |
| } |
| |
| Goffset uxrefOffset = outStr->getPos(); |
| int numobjects = xref->getNumObjects(); |
| const char *fileNameA = fileName ? fileName->getCString() : NULL; |
| Ref rootRef, uxrefStreamRef; |
| rootRef.num = getXRef()->getRootNum(); |
| rootRef.gen = getXRef()->getRootGen(); |
| |
| // Output a xref stream if there is a xref stream already |
| GBool xRefStream = xref->isXRefStream(); |
| |
| if (xRefStream) { |
| // Append an entry for the xref stream itself |
| uxrefStreamRef.num = numobjects++; |
| uxrefStreamRef.gen = 0; |
| uxref->add(uxrefStreamRef.num, uxrefStreamRef.gen, uxrefOffset, gTrue); |
| } |
| |
| Object trailerDict = createTrailerDict(numobjects, gTrue, getStartXRef(), &rootRef, getXRef(), fileNameA, uxrefOffset); |
| if (xRefStream) { |
| writeXRefStreamTrailer(std::move(trailerDict), uxref, &uxrefStreamRef, uxrefOffset, outStr, getXRef()); |
| } else { |
| writeXRefTableTrailer(std::move(trailerDict), uxref, gFalse, uxrefOffset, outStr, getXRef()); |
| } |
| |
| delete uxref; |
| } |
| |
| void PDFDoc::saveCompleteRewrite (OutStream* outStr) |
| { |
| // Make sure that special flags are set, because we are going to read |
| // all objects, including Unencrypted ones. |
| xref->scanSpecialFlags(); |
| |
| Guchar *fileKey; |
| CryptAlgorithm encAlgorithm; |
| int keyLength; |
| xref->getEncryptionParameters(&fileKey, &encAlgorithm, &keyLength); |
| |
| outStr->printf("%%PDF-%d.%d\r\n",pdfMajorVersion,pdfMinorVersion); |
| XRef *uxref = new XRef(); |
| uxref->add(0, 65535, 0, gFalse); |
| xref->lock(); |
| for(int i=0; i<xref->getNumObjects(); i++) { |
| Ref ref; |
| XRefEntryType type = xref->getEntry(i)->type; |
| if (type == xrefEntryFree) { |
| ref.num = i; |
| ref.gen = xref->getEntry(i)->gen; |
| /* the XRef class adds a lot of irrelevant free entries, we only want the significant one |
| and we don't want the one with num=0 because it has already been added (gen = 65535)*/ |
| if (ref.gen > 0 && ref.num > 0) |
| uxref->add(ref.num, ref.gen, 0, gFalse); |
| } else if (xref->getEntry(i)->getFlag(XRefEntry::DontRewrite)) { |
| // This entry must not be written, put a free entry instead (with incremented gen) |
| ref.num = i; |
| ref.gen = xref->getEntry(i)->gen + 1; |
| uxref->add(ref.num, ref.gen, 0, gFalse); |
| } else if (type == xrefEntryUncompressed){ |
| ref.num = i; |
| ref.gen = xref->getEntry(i)->gen; |
| Object obj1 = xref->fetch(ref.num, ref.gen, 1); |
| Goffset offset = writeObjectHeader(&ref, outStr); |
| // Write unencrypted objects in unencrypted form |
| if (xref->getEntry(i)->getFlag(XRefEntry::Unencrypted)) { |
| writeObject(&obj1, outStr, NULL, cryptRC4, 0, 0, 0); |
| } else { |
| writeObject(&obj1, outStr, fileKey, encAlgorithm, keyLength, ref.num, ref.gen); |
| } |
| writeObjectFooter(outStr); |
| uxref->add(ref.num, ref.gen, offset, gTrue); |
| } else if (type == xrefEntryCompressed) { |
| ref.num = i; |
| ref.gen = 0; //compressed entries have gen == 0 |
| Object obj1 = xref->fetch(ref.num, ref.gen, 1); |
| Goffset offset = writeObjectHeader(&ref, outStr); |
| writeObject(&obj1, outStr, fileKey, encAlgorithm, keyLength, ref.num, ref.gen); |
| writeObjectFooter(outStr); |
| uxref->add(ref.num, ref.gen, offset, gTrue); |
| } |
| } |
| xref->unlock(); |
| Goffset uxrefOffset = outStr->getPos(); |
| writeXRefTableTrailer(uxrefOffset, uxref, gTrue /* write all entries */, |
| uxref->getNumObjects(), outStr, gFalse /* complete rewrite */); |
| delete uxref; |
| } |
| |
| void PDFDoc::writeDictionnary (Dict* dict, OutStream* outStr, XRef *xRef, Guint numOffset, Guchar *fileKey, |
| CryptAlgorithm encAlgorithm, int keyLength, int objNum, int objGen, std::set<Dict*> *alreadyWrittenDicts) |
| { |
| bool deleteSet = false; |
| if (!alreadyWrittenDicts) { |
| alreadyWrittenDicts = new std::set<Dict*>; |
| deleteSet = true; |
| } |
| |
| if (alreadyWrittenDicts->find(dict) != alreadyWrittenDicts->end()) { |
| error(errSyntaxWarning, -1, "PDFDoc::writeDictionnary: Found recursive dicts"); |
| if (deleteSet) delete alreadyWrittenDicts; |
| return; |
| } else { |
| alreadyWrittenDicts->insert(dict); |
| } |
| |
| outStr->printf("<<"); |
| for (int i=0; i<dict->getLength(); i++) { |
| GooString keyName(dict->getKey(i)); |
| GooString *keyNameToPrint = keyName.sanitizedName(gFalse /* non ps mode */); |
| outStr->printf("/%s ", keyNameToPrint->getCString()); |
| delete keyNameToPrint; |
| Object obj1 = dict->getValNF(i); |
| writeObject(&obj1, outStr, xRef, numOffset, fileKey, encAlgorithm, keyLength, objNum, objGen, alreadyWrittenDicts); |
| } |
| outStr->printf(">> "); |
| |
| if (deleteSet) { |
| delete alreadyWrittenDicts; |
| } |
| } |
| |
| void PDFDoc::writeStream (Stream* str, OutStream* outStr) |
| { |
| outStr->printf("stream\r\n"); |
| str->reset(); |
| for (int c=str->getChar(); c!= EOF; c=str->getChar()) { |
| outStr->printf("%c", c); |
| } |
| outStr->printf("\r\nendstream\r\n"); |
| } |
| |
| void PDFDoc::writeRawStream (Stream* str, OutStream* outStr) |
| { |
| Object obj1 = str->getDict()->lookup("Length"); |
| if (!obj1.isInt() && !obj1.isInt64()) { |
| error (errSyntaxError, -1, "PDFDoc::writeRawStream, no Length in stream dict"); |
| return; |
| } |
| |
| Goffset length; |
| if (obj1.isInt()) |
| length = obj1.getInt(); |
| else |
| length = obj1.getInt64(); |
| |
| outStr->printf("stream\r\n"); |
| str->unfilteredReset(); |
| for (Goffset i = 0; i < length; i++) { |
| int c = str->getUnfilteredChar(); |
| if (unlikely(c == EOF)) { |
| error (errSyntaxError, -1, "PDFDoc::writeRawStream: EOF reading stream"); |
| break; |
| } |
| outStr->printf("%c", c); |
| } |
| str->reset(); |
| outStr->printf("\r\nendstream\r\n"); |
| } |
| |
| void PDFDoc::writeString (GooString* s, OutStream* outStr, Guchar *fileKey, |
| CryptAlgorithm encAlgorithm, int keyLength, int objNum, int objGen) |
| { |
| // Encrypt string if encryption is enabled |
| GooString *sEnc = NULL; |
| if (fileKey) { |
| EncryptStream *enc = new EncryptStream(new MemStream(s->getCString(), 0, s->getLength(), Object(objNull)), |
| fileKey, encAlgorithm, keyLength, objNum, objGen); |
| sEnc = new GooString(); |
| int c; |
| enc->reset(); |
| while ((c = enc->getChar()) != EOF) { |
| sEnc->append((char)c); |
| } |
| |
| delete enc; |
| s = sEnc; |
| } |
| |
| // Write data |
| if (s->hasUnicodeMarker()) { |
| //unicode string don't necessary end with \0 |
| const char* c = s->getCString(); |
| outStr->printf("("); |
| for(int i=0; i<s->getLength(); i++) { |
| char unescaped = *(c+i)&0x000000ff; |
| //escape if needed |
| if (unescaped == '(' || unescaped == ')' || unescaped == '\\') |
| outStr->printf("%c", '\\'); |
| outStr->printf("%c", unescaped); |
| } |
| outStr->printf(") "); |
| } else { |
| const char* c = s->getCString(); |
| outStr->printf("("); |
| for(int i=0; i<s->getLength(); i++) { |
| char unescaped = *(c+i)&0x000000ff; |
| //escape if needed |
| if (unescaped == '\r') |
| outStr->printf("\\r"); |
| else if (unescaped == '\n') |
| outStr->printf("\\n"); |
| else { |
| if (unescaped == '(' || unescaped == ')' || unescaped == '\\') { |
| outStr->printf("%c", '\\'); |
| } |
| outStr->printf("%c", unescaped); |
| } |
| } |
| outStr->printf(") "); |
| } |
| |
| delete sEnc; |
| } |
| |
| Goffset PDFDoc::writeObjectHeader (Ref *ref, OutStream* outStr) |
| { |
| Goffset offset = outStr->getPos(); |
| outStr->printf("%i %i obj ", ref->num, ref->gen); |
| return offset; |
| } |
| |
| void PDFDoc::writeObject (Object* obj, OutStream* outStr, XRef *xRef, Guint numOffset, Guchar *fileKey, |
| CryptAlgorithm encAlgorithm, int keyLength, int objNum, int objGen, std::set<Dict*> *alreadyWrittenDicts) |
| { |
| Array *array; |
| |
| switch (obj->getType()) { |
| case objBool: |
| outStr->printf("%s ", obj->getBool()?"true":"false"); |
| break; |
| case objInt: |
| outStr->printf("%i ", obj->getInt()); |
| break; |
| case objInt64: |
| outStr->printf("%lli ", obj->getInt64()); |
| break; |
| case objReal: |
| { |
| GooString s; |
| s.appendf("{0:.10g}", obj->getReal()); |
| outStr->printf("%s ", s.getCString()); |
| break; |
| } |
| case objString: |
| writeString(obj->getString(), outStr, fileKey, encAlgorithm, keyLength, objNum, objGen); |
| break; |
| case objName: |
| { |
| GooString name(obj->getName()); |
| GooString *nameToPrint = name.sanitizedName(gFalse /* non ps mode */); |
| outStr->printf("/%s ", nameToPrint->getCString()); |
| delete nameToPrint; |
| break; |
| } |
| case objNull: |
| outStr->printf( "null "); |
| break; |
| case objArray: |
| array = obj->getArray(); |
| outStr->printf("["); |
| for (int i=0; i<array->getLength(); i++) { |
| Object obj1 = array->getNF(i); |
| writeObject(&obj1, outStr, xRef, numOffset, fileKey, encAlgorithm, keyLength, objNum, objGen); |
| } |
| outStr->printf("] "); |
| break; |
| case objDict: |
| writeDictionnary (obj->getDict(), outStr, xRef, numOffset, fileKey, encAlgorithm, keyLength, objNum, objGen, alreadyWrittenDicts); |
| break; |
| case objStream: |
| { |
| //We can't modify stream with the current implementation (no write functions in Stream API) |
| // => the only type of streams which that have been modified are internal streams (=strWeird) |
| Stream *stream = obj->getStream(); |
| if (stream->getKind() == strWeird || stream->getKind() == strCrypt) { |
| //we write the stream unencoded => TODO: write stream encoder |
| |
| // Encrypt stream |
| EncryptStream *encStream = NULL; |
| GBool removeFilter = gTrue; |
| if (stream->getKind() == strWeird && fileKey) { |
| Object filter = stream->getDict()->lookup("Filter"); |
| if (!filter.isName("Crypt")) { |
| if (filter.isArray()) { |
| for (int i = 0; i < filter.arrayGetLength(); i++) { |
| Object filterEle = filter.arrayGet(i); |
| if (filterEle.isName("Crypt")) { |
| removeFilter = gFalse; |
| break; |
| } |
| } |
| if (removeFilter) { |
| encStream = new EncryptStream(stream, fileKey, encAlgorithm, keyLength, objNum, objGen); |
| encStream->setAutoDelete(gFalse); |
| stream = encStream; |
| } |
| } else { |
| encStream = new EncryptStream(stream, fileKey, encAlgorithm, keyLength, objNum, objGen); |
| encStream->setAutoDelete(gFalse); |
| stream = encStream; |
| } |
| } else { |
| removeFilter = gFalse; |
| } |
| } else if (fileKey != NULL) { // Encrypt stream |
| encStream = new EncryptStream(stream, fileKey, encAlgorithm, keyLength, objNum, objGen); |
| encStream->setAutoDelete(gFalse); |
| stream = encStream; |
| } |
| |
| stream->reset(); |
| //recalculate stream length |
| Goffset tmp = 0; |
| for (int c=stream->getChar(); c!=EOF; c=stream->getChar()) { |
| tmp++; |
| } |
| stream->getDict()->set("Length", Object(tmp)); |
| |
| //Remove Stream encoding |
| if (removeFilter) { |
| stream->getDict()->remove("Filter"); |
| } |
| stream->getDict()->remove("DecodeParms"); |
| |
| writeDictionnary (stream->getDict(),outStr, xRef, numOffset, fileKey, encAlgorithm, keyLength, objNum, objGen, alreadyWrittenDicts); |
| writeStream (stream,outStr); |
| delete encStream; |
| } else { |
| //raw stream copy |
| FilterStream *fs = dynamic_cast<FilterStream*>(stream); |
| if (fs) { |
| BaseStream *bs = fs->getBaseStream(); |
| if (bs) { |
| Goffset streamEnd; |
| if (xRef->getStreamEnd(bs->getStart(), &streamEnd)) { |
| Goffset val = streamEnd - bs->getStart(); |
| stream->getDict()->set("Length", Object(val)); |
| } |
| } |
| } |
| writeDictionnary (stream->getDict(), outStr, xRef, numOffset, fileKey, encAlgorithm, keyLength, objNum, objGen, alreadyWrittenDicts); |
| writeRawStream (stream, outStr); |
| } |
| break; |
| } |
| case objRef: |
| outStr->printf("%i %i R ", obj->getRef().num + numOffset, obj->getRef().gen); |
| break; |
| case objCmd: |
| outStr->printf("%s\n", obj->getCmd()); |
| break; |
| case objError: |
| outStr->printf("error\r\n"); |
| break; |
| case objEOF: |
| outStr->printf("eof\r\n"); |
| break; |
| case objNone: |
| outStr->printf("none\r\n"); |
| break; |
| default: |
| error(errUnimplemented, -1,"Unhandled objType : {0:d}, please report a bug with a testcase\r\n", obj->getType()); |
| break; |
| } |
| } |
| |
| void PDFDoc::writeObjectFooter (OutStream* outStr) |
| { |
| outStr->printf("endobj\r\n"); |
| } |
| |
| Object PDFDoc::createTrailerDict(int uxrefSize, GBool incrUpdate, Goffset startxRef, |
| Ref *root, XRef *xRef, const char *fileName, Goffset fileSize) |
| { |
| Dict *trailerDict = new Dict(xRef); |
| trailerDict->set("Size", Object(uxrefSize)); |
| |
| //build a new ID, as recommended in the reference, uses: |
| // - current time |
| // - file name |
| // - file size |
| // - values of entry in information dictionnary |
| GooString message; |
| char buffer[256]; |
| sprintf(buffer, "%i", (int)time(NULL)); |
| message.append(buffer); |
| |
| if (fileName) |
| message.append(fileName); |
| |
| sprintf(buffer, "%lli", (long long)fileSize); |
| message.append(buffer); |
| |
| //info dict -- only use text string |
| if (!xRef->getTrailerDict()->isNone()) { |
| Object docInfo = xRef->getDocInfo(); |
| if (docInfo.isDict()) { |
| for(int i=0; i<docInfo.getDict()->getLength(); i++) { |
| Object obj2 = docInfo.getDict()->getVal(i); |
| if (obj2.isString()) { |
| message.append(obj2.getString()); |
| } |
| } |
| } |
| } |
| |
| GBool hasEncrypt = gFalse; |
| if (!xRef->getTrailerDict()->isNone()) { |
| Object obj2 = xRef->getTrailerDict()->dictLookupNF("Encrypt"); |
| if (!obj2.isNull()) { |
| trailerDict->set("Encrypt", std::move(obj2)); |
| hasEncrypt = gTrue; |
| } |
| } |
| |
| //calculate md5 digest |
| Guchar digest[16]; |
| md5((Guchar*)message.getCString(), message.getLength(), digest); |
| |
| //create ID array |
| // In case of encrypted files, the ID must not be changed because it's used to calculate the key |
| if (incrUpdate || hasEncrypt) { |
| //only update the second part of the array |
| Object obj4 = xRef->getTrailerDict()->getDict()->lookup("ID"); |
| if (!obj4.isArray()) { |
| error(errSyntaxWarning, -1, "PDFDoc::createTrailerDict original file's ID entry isn't an array. Trying to continue"); |
| } else { |
| Array *array = new Array(xRef); |
| //Get the first part of the ID |
| array->add(obj4.arrayGet(0)); |
| array->add(Object(new GooString((const char*)digest, 16))); |
| trailerDict->set("ID", Object(array)); |
| } |
| } else { |
| //new file => same values for the two identifiers |
| Array *array = new Array(xRef); |
| array->add(Object(new GooString((const char*)digest, 16))); |
| array->add(Object(new GooString((const char*)digest, 16))); |
| trailerDict->set("ID", Object(array)); |
| } |
| |
| trailerDict->set("Root", Object(root->num, root->gen)); |
| |
| if (incrUpdate) { |
| trailerDict->set("Prev", Object(startxRef)); |
| } |
| |
| if (!xRef->getTrailerDict()->isNone()) { |
| Object obj5 = xRef->getDocInfoNF(); |
| if (!obj5.isNull()) { |
| trailerDict->set("Info", std::move(obj5)); |
| } |
| } |
| |
| return Object(trailerDict); |
| } |
| |
| void PDFDoc::writeXRefTableTrailer(Object &&trailerDict, XRef *uxref, GBool writeAllEntries, Goffset uxrefOffset, OutStream* outStr, XRef *xRef) |
| { |
| uxref->writeTableToFile( outStr, writeAllEntries ); |
| outStr->printf( "trailer\r\n"); |
| writeDictionnary(trailerDict.getDict(), outStr, xRef, 0, NULL, cryptRC4, 0, 0, 0, nullptr); |
| outStr->printf( "\r\nstartxref\r\n"); |
| outStr->printf( "%lli\r\n", uxrefOffset); |
| outStr->printf( "%%%%EOF\r\n"); |
| } |
| |
| void PDFDoc::writeXRefStreamTrailer (Object &&trailerDict, XRef *uxref, Ref *uxrefStreamRef, Goffset uxrefOffset, OutStream* outStr, XRef *xRef) |
| { |
| GooString stmData; |
| |
| // Fill stmData and some trailerDict fields |
| uxref->writeStreamToBuffer(&stmData, trailerDict.getDict(), xRef); |
| |
| // Create XRef stream object and write it |
| MemStream *mStream = new MemStream( stmData.getCString(), 0, stmData.getLength(), std::move(trailerDict) ); |
| writeObjectHeader(uxrefStreamRef, outStr); |
| Object obj1(static_cast<Stream*>(mStream)); |
| writeObject(&obj1, outStr, xRef, 0, NULL, cryptRC4, 0, 0, 0); |
| writeObjectFooter(outStr); |
| |
| outStr->printf( "startxref\r\n"); |
| outStr->printf( "%lli\r\n", uxrefOffset); |
| outStr->printf( "%%%%EOF\r\n"); |
| } |
| |
| void PDFDoc::writeXRefTableTrailer(Goffset uxrefOffset, XRef *uxref, GBool writeAllEntries, |
| int uxrefSize, OutStream* outStr, GBool incrUpdate) |
| { |
| const char *fileNameA = fileName ? fileName->getCString() : NULL; |
| // file size (doesn't include the trailer) |
| unsigned int fileSize = 0; |
| int c; |
| str->reset(); |
| while ((c = str->getChar()) != EOF) { |
| fileSize++; |
| } |
| str->close(); |
| Ref ref; |
| ref.num = getXRef()->getRootNum(); |
| ref.gen = getXRef()->getRootGen(); |
| Object trailerDict = createTrailerDict(uxrefSize, incrUpdate, getStartXRef(), &ref, |
| getXRef(), fileNameA, fileSize); |
| writeXRefTableTrailer(std::move(trailerDict), uxref, writeAllEntries, uxrefOffset, outStr, getXRef()); |
| } |
| |
| void PDFDoc::writeHeader(OutStream *outStr, int major, int minor) |
| { |
| outStr->printf("%%PDF-%d.%d\n", major, minor); |
| outStr->printf("%%\xE2\xE3\xCF\xD3\n"); |
| } |
| |
| void PDFDoc::markDictionnary (Dict* dict, XRef * xRef, XRef *countRef, Guint numOffset, int oldRefNum, int newRefNum, std::set<Dict*> *alreadyMarkedDicts) |
| { |
| bool deleteSet = false; |
| if (!alreadyMarkedDicts) { |
| alreadyMarkedDicts = new std::set<Dict*>; |
| deleteSet = true; |
| } |
| |
| if (alreadyMarkedDicts->find(dict) != alreadyMarkedDicts->end()) { |
| error(errSyntaxWarning, -1, "PDFDoc::markDictionnary: Found recursive dicts"); |
| if (deleteSet) delete alreadyMarkedDicts; |
| return; |
| } else { |
| alreadyMarkedDicts->insert(dict); |
| } |
| |
| Object obj1; |
| for (int i=0; i<dict->getLength(); i++) { |
| const char *key = dict->getKey(i); |
| if (strcmp(key, "Annots") != 0) { |
| Object obj1 = dict->getValNF(i); |
| markObject(&obj1, xRef, countRef, numOffset, oldRefNum, newRefNum, alreadyMarkedDicts); |
| } else { |
| Object annotsObj = dict->getValNF(i); |
| if (!annotsObj.isNull()) { |
| markAnnotations(&annotsObj, xRef, countRef, 0, oldRefNum, newRefNum, alreadyMarkedDicts); |
| } |
| } |
| } |
| |
| if (deleteSet) { |
| delete alreadyMarkedDicts; |
| } |
| } |
| |
| void PDFDoc::markObject (Object* obj, XRef *xRef, XRef *countRef, Guint numOffset, int oldRefNum, int newRefNum, std::set<Dict*> *alreadyMarkedDicts) |
| { |
| Array *array; |
| |
| switch (obj->getType()) { |
| case objArray: |
| array = obj->getArray(); |
| for (int i=0; i<array->getLength(); i++) { |
| Object obj1 = array->getNF(i); |
| markObject(&obj1, xRef, countRef, numOffset, oldRefNum, newRefNum); |
| } |
| break; |
| case objDict: |
| markDictionnary (obj->getDict(), xRef, countRef, numOffset, oldRefNum, newRefNum, alreadyMarkedDicts); |
| break; |
| case objStream: |
| { |
| Stream *stream = obj->getStream(); |
| markDictionnary (stream->getDict(), xRef, countRef, numOffset, oldRefNum, newRefNum, alreadyMarkedDicts); |
| } |
| break; |
| case objRef: |
| { |
| if (obj->getRef().num + (int) numOffset >= xRef->getNumObjects() || xRef->getEntry(obj->getRef().num + numOffset)->type == xrefEntryFree) { |
| if (getXRef()->getEntry(obj->getRef().num)->type == xrefEntryFree) { |
| return; // already marked as free => should be replaced |
| } |
| xRef->add(obj->getRef().num + numOffset, obj->getRef().gen, 0, gTrue); |
| if (getXRef()->getEntry(obj->getRef().num)->type == xrefEntryCompressed) { |
| xRef->getEntry(obj->getRef().num + numOffset)->type = xrefEntryCompressed; |
| } |
| } |
| if (obj->getRef().num + (int) numOffset >= countRef->getNumObjects() || |
| countRef->getEntry(obj->getRef().num + numOffset)->type == xrefEntryFree) |
| { |
| countRef->add(obj->getRef().num + numOffset, 1, 0, gTrue); |
| } else { |
| XRefEntry *entry = countRef->getEntry(obj->getRef().num + numOffset); |
| entry->gen++; |
| if (entry->gen > 9) |
| break; |
| } |
| Object obj1 = getXRef()->fetch(obj->getRef().num, obj->getRef().gen); |
| markObject(&obj1, xRef, countRef, numOffset, oldRefNum, newRefNum); |
| } |
| break; |
| default: |
| break; |
| } |
| } |
| |
| void PDFDoc::replacePageDict(int pageNo, int rotate, |
| PDFRectangle *mediaBox, |
| PDFRectangle *cropBox) |
| { |
| Ref *refPage = getCatalog()->getPageRef(pageNo); |
| Object page = getXRef()->fetch(refPage->num, refPage->gen); |
| Dict *pageDict = page.getDict(); |
| pageDict->remove("MediaBoxssdf"); |
| pageDict->remove("MediaBox"); |
| pageDict->remove("CropBox"); |
| pageDict->remove("ArtBox"); |
| pageDict->remove("BleedBox"); |
| pageDict->remove("TrimBox"); |
| pageDict->remove("Rotate"); |
| Array *mediaBoxArray = new Array(getXRef()); |
| mediaBoxArray->add(Object(mediaBox->x1)); |
| mediaBoxArray->add(Object(mediaBox->y1)); |
| mediaBoxArray->add(Object(mediaBox->x2)); |
| mediaBoxArray->add(Object(mediaBox->y2)); |
| Object mediaBoxObject(mediaBoxArray); |
| Object trimBoxObject = mediaBoxObject.copy(); |
| pageDict->add(copyString("MediaBox"), std::move(mediaBoxObject)); |
| if (cropBox != NULL) { |
| Array *cropBoxArray = new Array(getXRef()); |
| cropBoxArray->add(Object(cropBox->x1)); |
| cropBoxArray->add(Object(cropBox->y1)); |
| cropBoxArray->add(Object(cropBox->x2)); |
| cropBoxArray->add(Object(cropBox->y2)); |
| Object cropBoxObject(cropBoxArray); |
| trimBoxObject = cropBoxObject.copy(); |
| pageDict->add(copyString("CropBox"), std::move(cropBoxObject)); |
| } |
| pageDict->add(copyString("TrimBox"), std::move(trimBoxObject)); |
| pageDict->add(copyString("Rotate"), Object(rotate)); |
| getXRef()->setModifiedObject(&page, *refPage); |
| } |
| |
| void PDFDoc::markPageObjects(Dict *pageDict, XRef *xRef, XRef *countRef, Guint numOffset, int oldRefNum, int newRefNum, std::set<Dict*> *alreadyMarkedDicts) |
| { |
| pageDict->remove("OpenAction"); |
| pageDict->remove("Outlines"); |
| pageDict->remove("StructTreeRoot"); |
| |
| for (int n = 0; n < pageDict->getLength(); n++) { |
| const char *key = pageDict->getKey(n); |
| Object value = pageDict->getValNF(n); |
| if (strcmp(key, "Parent") != 0 && |
| strcmp(key, "Pages") != 0 && |
| strcmp(key, "AcroForm") != 0 && |
| strcmp(key, "Annots") != 0 && |
| strcmp(key, "P") != 0 && |
| strcmp(key, "Root") != 0) { |
| markObject(&value, xRef, countRef, numOffset, oldRefNum, newRefNum, alreadyMarkedDicts); |
| } |
| } |
| } |
| |
| GBool PDFDoc::markAnnotations(Object *annotsObj, XRef *xRef, XRef *countRef, Guint numOffset, int oldPageNum, int newPageNum, std::set<Dict*> *alreadyMarkedDicts) { |
| GBool modified = gFalse; |
| Object annots = annotsObj->fetch(getXRef()); |
| if (annots.isArray()) { |
| Array *array = annots.getArray(); |
| for (int i=array->getLength() - 1; i >= 0; i--) { |
| Object obj1 = array->get(i); |
| if (obj1.isDict()) { |
| Dict *dict = obj1.getDict(); |
| Object type = dict->lookup("Type"); |
| if (type.isName() && strcmp(type.getName(), "Annot") == 0) { |
| Object obj2 = dict->lookupNF("P"); |
| if (obj2.isRef()) { |
| if (obj2.getRef().num == oldPageNum) { |
| Object obj3 = array->getNF(i); |
| if (obj3.isRef()) { |
| dict->set("P", Object(newPageNum, 0)); |
| getXRef()->setModifiedObject(&obj1, obj3.getRef()); |
| } |
| } else if (obj2.getRef().num == newPageNum) { |
| continue; |
| } else { |
| Object page = getXRef()->fetch(obj2.getRef().num, obj2.getRef().gen); |
| if (page.isDict()) { |
| Dict *dict = page.getDict(); |
| Object pagetype = dict->lookup("Type"); |
| if (!pagetype.isName() || strcmp(pagetype.getName(), "Page") != 0) { |
| continue; |
| } |
| } |
| array->remove(i); |
| modified = gTrue; |
| continue; |
| } |
| } |
| } |
| markPageObjects(dict, xRef, countRef, numOffset, oldPageNum, newPageNum, alreadyMarkedDicts); |
| } |
| obj1 = array->getNF(i); |
| if (obj1.isRef()) { |
| if (obj1.getRef().num + (int) numOffset >= xRef->getNumObjects() || xRef->getEntry(obj1.getRef().num + numOffset)->type == xrefEntryFree) { |
| if (getXRef()->getEntry(obj1.getRef().num)->type == xrefEntryFree) { |
| continue; // already marked as free => should be replaced |
| } |
| xRef->add(obj1.getRef().num + numOffset, obj1.getRef().gen, 0, gTrue); |
| if (getXRef()->getEntry(obj1.getRef().num)->type == xrefEntryCompressed) { |
| xRef->getEntry(obj1.getRef().num + numOffset)->type = xrefEntryCompressed; |
| } |
| } |
| if (obj1.getRef().num + (int) numOffset >= countRef->getNumObjects() || |
| countRef->getEntry(obj1.getRef().num + numOffset)->type == xrefEntryFree) |
| { |
| countRef->add(obj1.getRef().num + numOffset, 1, 0, gTrue); |
| } else { |
| XRefEntry *entry = countRef->getEntry(obj1.getRef().num + numOffset); |
| entry->gen++; |
| } |
| } |
| } |
| } |
| if (annotsObj->isRef()) { |
| if (annotsObj->getRef().num + (int) numOffset >= xRef->getNumObjects() || xRef->getEntry(annotsObj->getRef().num + numOffset)->type == xrefEntryFree) { |
| if (getXRef()->getEntry(annotsObj->getRef().num)->type == xrefEntryFree) { |
| return modified; // already marked as free => should be replaced |
| } |
| xRef->add(annotsObj->getRef().num + numOffset, annotsObj->getRef().gen, 0, gTrue); |
| if (getXRef()->getEntry(annotsObj->getRef().num)->type == xrefEntryCompressed) { |
| xRef->getEntry(annotsObj->getRef().num + numOffset)->type = xrefEntryCompressed; |
| } |
| } |
| if (annotsObj->getRef().num + (int) numOffset >= countRef->getNumObjects() || |
| countRef->getEntry(annotsObj->getRef().num + numOffset)->type == xrefEntryFree) |
| { |
| countRef->add(annotsObj->getRef().num + numOffset, 1, 0, gTrue); |
| } else { |
| XRefEntry *entry = countRef->getEntry(annotsObj->getRef().num + numOffset); |
| entry->gen++; |
| } |
| getXRef()->setModifiedObject(&annots, annotsObj->getRef()); |
| } |
| return modified; |
| } |
| |
| void PDFDoc::markAcroForm(Object *afObj, XRef *xRef, XRef *countRef, Guint numOffset, int oldRefNum, int newRefNum) { |
| GBool modified = gFalse; |
| Object acroform = afObj->fetch(getXRef()); |
| if (acroform.isDict()) { |
| Dict *dict = acroform.getDict(); |
| for (int i=0; i < dict->getLength(); i++) { |
| if (strcmp(dict->getKey(i), "Fields") == 0) { |
| Object fields = dict->getValNF(i); |
| modified = markAnnotations(&fields, xRef, countRef, numOffset, oldRefNum, newRefNum); |
| } else { |
| Object obj = dict->getValNF(i); |
| markObject(&obj, xRef, countRef, numOffset, oldRefNum, newRefNum); |
| } |
| } |
| } |
| if (afObj->isRef()) { |
| if (afObj->getRef().num + (int) numOffset >= xRef->getNumObjects() || xRef->getEntry(afObj->getRef().num + numOffset)->type == xrefEntryFree) { |
| if (getXRef()->getEntry(afObj->getRef().num)->type == xrefEntryFree) { |
| return; // already marked as free => should be replaced |
| } |
| xRef->add(afObj->getRef().num + numOffset, afObj->getRef().gen, 0, gTrue); |
| if (getXRef()->getEntry(afObj->getRef().num)->type == xrefEntryCompressed) { |
| xRef->getEntry(afObj->getRef().num + numOffset)->type = xrefEntryCompressed; |
| } |
| } |
| if (afObj->getRef().num + (int) numOffset >= countRef->getNumObjects() || |
| countRef->getEntry(afObj->getRef().num + numOffset)->type == xrefEntryFree) |
| { |
| countRef->add(afObj->getRef().num + numOffset, 1, 0, gTrue); |
| } else { |
| XRefEntry *entry = countRef->getEntry(afObj->getRef().num + numOffset); |
| entry->gen++; |
| } |
| if (modified){ |
| getXRef()->setModifiedObject(&acroform, afObj->getRef()); |
| } |
| } |
| return; |
| } |
| |
| Guint PDFDoc::writePageObjects(OutStream *outStr, XRef *xRef, Guint numOffset, GBool combine) |
| { |
| Guint objectsCount = 0; //count the number of objects in the XRef(s) |
| Guchar *fileKey; |
| CryptAlgorithm encAlgorithm; |
| int keyLength; |
| xRef->getEncryptionParameters(&fileKey, &encAlgorithm, &keyLength); |
| |
| for (int n = numOffset; n < xRef->getNumObjects(); n++) { |
| if (xRef->getEntry(n)->type != xrefEntryFree) { |
| Ref ref; |
| ref.num = n; |
| ref.gen = xRef->getEntry(n)->gen; |
| objectsCount++; |
| Object obj = getXRef()->fetch(ref.num - numOffset, ref.gen); |
| Goffset offset = writeObjectHeader(&ref, outStr); |
| if (combine) { |
| writeObject(&obj, outStr, getXRef(), numOffset, NULL, cryptRC4, 0, 0, 0); |
| } else if (xRef->getEntry(n)->getFlag(XRefEntry::Unencrypted)) { |
| writeObject(&obj, outStr, NULL, cryptRC4, 0, 0, 0); |
| } else { |
| writeObject(&obj, outStr, fileKey, encAlgorithm, keyLength, ref.num, ref.gen); |
| } |
| writeObjectFooter(outStr); |
| xRef->add(ref.num, ref.gen, offset, gTrue); |
| } |
| } |
| return objectsCount; |
| } |
| |
| #ifndef DISABLE_OUTLINE |
| Outline *PDFDoc::getOutline() |
| { |
| if (!outline) { |
| pdfdocLocker(); |
| // read outline |
| outline = new Outline(catalog->getOutline(), xref); |
| } |
| |
| return outline; |
| } |
| #endif |
| |
| PDFDoc *PDFDoc::ErrorPDFDoc(int errorCode, GooString *fileNameA) |
| { |
| PDFDoc *doc = new PDFDoc(); |
| doc->errCode = errorCode; |
| doc->fileName = fileNameA; |
| |
| return doc; |
| } |
| |
| long long PDFDoc::strToLongLong(char *s) { |
| long long x, d; |
| char *p; |
| |
| x = 0; |
| for (p = s; *p && isdigit(*p & 0xff); ++p) { |
| d = *p - '0'; |
| if (x > (LLONG_MAX - d) / 10) { |
| break; |
| } |
| x = 10 * x + d; |
| } |
| return x; |
| } |
| |
| // Read the 'startxref' position. |
| Goffset PDFDoc::getStartXRef(GBool tryingToReconstruct) |
| { |
| if (startXRefPos == -1) { |
| |
| if (isLinearized(tryingToReconstruct)) { |
| char buf[linearizationSearchSize+1]; |
| int c, n, i; |
| |
| str->setPos(0); |
| for (n = 0; n < linearizationSearchSize; ++n) { |
| if ((c = str->getChar()) == EOF) { |
| break; |
| } |
| buf[n] = c; |
| } |
| buf[n] = '\0'; |
| |
| // find end of first obj (linearization dictionary) |
| startXRefPos = 0; |
| for (i = 0; i < n; i++) { |
| if (!strncmp("endobj", &buf[i], 6)) { |
| i += 6; |
| //skip whitespace |
| while (buf[i] && Lexer::isSpace(buf[i])) ++i; |
| startXRefPos = i; |
| break; |
| } |
| } |
| } else { |
| char buf[xrefSearchSize+1]; |
| char *p; |
| int c, n, i; |
| |
| // read last xrefSearchSize bytes |
| int segnum = 0; |
| int maxXRefSearch = 24576; |
| if (str->getLength() < maxXRefSearch) maxXRefSearch = str->getLength(); |
| for (; (xrefSearchSize - 16) * segnum < maxXRefSearch; segnum++) { |
| str->setPos((xrefSearchSize - 16) * segnum + xrefSearchSize, -1); |
| for (n = 0; n < xrefSearchSize; ++n) { |
| if ((c = str->getChar()) == EOF) { |
| break; |
| } |
| buf[n] = c; |
| } |
| buf[n] = '\0'; |
| |
| // find startxref |
| for (i = n - 9; i >= 0; --i) { |
| if (!strncmp(&buf[i], "startxref", 9)) { |
| break; |
| } |
| } |
| if (i < 0) { |
| startXRefPos = 0; |
| } else { |
| for (p = &buf[i + 9]; isspace(*p); ++p); |
| startXRefPos = strToLongLong(p); |
| break; |
| } |
| } |
| } |
| |
| } |
| |
| return startXRefPos; |
| } |
| |
| Goffset PDFDoc::getMainXRefEntriesOffset(GBool tryingToReconstruct) |
| { |
| Guint mainXRefEntriesOffset = 0; |
| |
| if (isLinearized(tryingToReconstruct)) { |
| mainXRefEntriesOffset = getLinearization()->getMainXRefEntriesOffset(); |
| } |
| |
| return mainXRefEntriesOffset; |
| } |
| |
| int PDFDoc::getNumPages() |
| { |
| if (isLinearized()) { |
| int n; |
| if ((n = getLinearization()->getNumPages())) { |
| return n; |
| } |
| } |
| |
| return catalog->getNumPages(); |
| } |
| |
| Page *PDFDoc::parsePage(int page) |
| { |
| Ref pageRef; |
| |
| pageRef.num = getHints()->getPageObjectNum(page); |
| if (!pageRef.num) { |
| error(errSyntaxWarning, -1, "Failed to get object num from hint tables for page {0:d}", page); |
| return NULL; |
| } |
| |
| // check for bogus ref - this can happen in corrupted PDF files |
| if (pageRef.num < 0 || pageRef.num >= xref->getNumObjects()) { |
| error(errSyntaxWarning, -1, "Invalid object num ({0:d}) for page {1:d}", pageRef.num, page); |
| return NULL; |
| } |
| |
| pageRef.gen = xref->getEntry(pageRef.num)->gen; |
| Object obj = xref->fetch(pageRef.num, pageRef.gen); |
| if (!obj.isDict("Page")) { |
| error(errSyntaxWarning, -1, "Object ({0:d} {1:d}) is not a pageDict", pageRef.num, pageRef.gen); |
| return NULL; |
| } |
| Dict *pageDict = obj.getDict(); |
| |
| return new Page(this, page, &obj, pageRef, |
| new PageAttrs(NULL, pageDict), catalog->getForm()); |
| } |
| |
| Page *PDFDoc::getPage(int page) |
| { |
| if ((page < 1) || page > getNumPages()) return NULL; |
| |
| if (isLinearized() && checkLinearization()) { |
| pdfdocLocker(); |
| if (!pageCache) { |
| pageCache = (Page **) gmallocn(getNumPages(), sizeof(Page *)); |
| for (int i = 0; i < getNumPages(); i++) { |
| pageCache[i] = NULL; |
| } |
| } |
| if (!pageCache[page-1]) { |
| pageCache[page-1] = parsePage(page); |
| } |
| if (pageCache[page-1]) { |
| return pageCache[page-1]; |
| } else { |
| error(errSyntaxWarning, -1, "Failed parsing page {0:d} using hint tables", page); |
| } |
| } |
| |
| return catalog->getPage(page); |
| } |