diff options
author | Kristian Høgsberg <krh@redhat.com> | 2005-03-01 22:24:10 (GMT) |
---|---|---|
committer | Kristian Høgsberg <krh@src.gnome.org> | 2005-03-01 22:24:10 (GMT) |
commit | 02eb16fef45712a91e24f6471b9e2f31249c888e (patch) | |
tree | d5579258f1d7fbd5a280fb2f1b97b74004b1dea9 /pdf/xpdf/XRef.cc | |
parent | 332afee84ff4eb7df326d96f07efd6f82a87c0a2 (diff) |
Use poppler instead of including xpdf source code. Poppler is a fork of
2005-03-01 Kristian Høgsberg <krh@redhat.com>
Use poppler instead of including xpdf source code. Poppler is a
fork of xpdf to build it as a shared library. See
http://freedesktop.org/wiki/Software/poppler.
* pdf/xpdf/*, pdf/goo/*, pdf/splash/*, pdf/fofi/*: Remove included
xpdf fork.
* pdf/Makefile.am: Build libpdfdocument.a here.
* pdf/GDKSplashOutputDev.cc:
* pdf/GDKSplashOutputDev.h:
* pdf/GnomeVFSStream.cc:
* pdf/GnomeVFSStream.h:
* pdf-document.cc:
* pdf-document.h:
* test-gdk-output-dev.cc
* Thumb.cc:
* Thumb.h: Pull these files out of pdf/xpdf and adjust to compile
against poppler.
Diffstat (limited to 'pdf/xpdf/XRef.cc')
-rw-r--r-- | pdf/xpdf/XRef.cc | 1026 |
1 files changed, 0 insertions, 1026 deletions
diff --git a/pdf/xpdf/XRef.cc b/pdf/xpdf/XRef.cc deleted file mode 100644 index 5be2017..0000000 --- a/pdf/xpdf/XRef.cc +++ /dev/null @@ -1,1026 +0,0 @@ -//======================================================================== -// -// XRef.cc -// -// Copyright 1996-2003 Glyph & Cog, LLC -// -//======================================================================== - -#include <aconf.h> - -#ifdef USE_GCC_PRAGMAS -#pragma implementation -#endif - -#include <stdlib.h> -#include <stddef.h> -#include <string.h> -#include <ctype.h> -#include "gmem.h" -#include "Object.h" -#include "Stream.h" -#include "Lexer.h" -#include "Parser.h" -#include "Dict.h" -#ifndef NO_DECRYPTION -#include "Decrypt.h" -#endif -#include "Error.h" -#include "ErrorCodes.h" -#include "XRef.h" - -//------------------------------------------------------------------------ - -#define xrefSearchSize 1024 // read this many bytes at end of file - // to look for 'startxref' - -#ifndef NO_DECRYPTION -//------------------------------------------------------------------------ -// Permission bits -//------------------------------------------------------------------------ - -#define permPrint (1<<2) -#define permChange (1<<3) -#define permCopy (1<<4) -#define permNotes (1<<5) -#define defPermFlags 0xfffc -#endif - -//------------------------------------------------------------------------ -// ObjectStream -//------------------------------------------------------------------------ - -class ObjectStream { -public: - - // Create an object stream, using object number <objStrNum>, - // generation 0. - ObjectStream(XRef *xref, int objStrNumA); - - ~ObjectStream(); - - // Return the object number of this object stream. - int getObjStrNum() { return objStrNum; } - - // Get the <objIdx>th object from this stream, which should be - // object number <objNum>, generation 0. - Object *getObject(int objIdx, int objNum, Object *obj); - -private: - - int objStrNum; // object number of the object stream - int nObjects; // number of objects in the stream - Object *objs; // the objects (length = nObjects) - int *objNums; // the object numbers (length = nObjects) -}; - -ObjectStream::ObjectStream(XRef *xref, int objStrNumA) { - Stream *str; - Parser *parser; - int *offsets; - Object objStr, obj1, obj2; - int first, i; - - objStrNum = objStrNumA; - nObjects = 0; - objs = NULL; - objNums = NULL; - - if (!xref->fetch(objStrNum, 0, &objStr)->isStream()) { - goto err1; - } - - if (!objStr.streamGetDict()->lookup("N", &obj1)->isInt()) { - obj1.free(); - goto err1; - } - nObjects = obj1.getInt(); - obj1.free(); - if (nObjects <= 0) { - goto err1; - } - - if (!objStr.streamGetDict()->lookup("First", &obj1)->isInt()) { - obj1.free(); - goto err1; - } - first = obj1.getInt(); - obj1.free(); - if (first < 0) { - goto err1; - } - - if (nObjects*(int)sizeof(int)/sizeof(int) != nObjects) { - error(-1, "Invalid 'nObjects'"); - goto err1; - } - - objs = new Object[nObjects]; - objNums = (int *)gmalloc(nObjects * sizeof(int)); - offsets = (int *)gmalloc(nObjects * sizeof(int)); - - // parse the header: object numbers and offsets - objStr.streamReset(); - obj1.initNull(); - str = new EmbedStream(objStr.getStream(), &obj1, gTrue, first); - parser = new Parser(xref, new Lexer(xref, str)); - for (i = 0; i < nObjects; ++i) { - parser->getObj(&obj1); - parser->getObj(&obj2); - if (!obj1.isInt() || !obj2.isInt()) { - obj1.free(); - obj2.free(); - delete parser; - gfree(offsets); - goto err1; - } - objNums[i] = obj1.getInt(); - offsets[i] = obj2.getInt(); - obj1.free(); - obj2.free(); - if (objNums[i] < 0 || offsets[i] < 0 || - (i > 0 && offsets[i] < offsets[i-1])) { - delete parser; - gfree(offsets); - goto err1; - } - } - while (str->getChar() != EOF) ; - delete parser; - - // skip to the first object - this shouldn't be necessary because - // the First key is supposed to be equal to offsets[0], but just in - // case... - for (i = first; i < offsets[0]; ++i) { - objStr.getStream()->getChar(); - } - - // parse the objects - for (i = 0; i < nObjects; ++i) { - obj1.initNull(); - if (i == nObjects - 1) { - str = new EmbedStream(objStr.getStream(), &obj1, gFalse, 0); - } else { - str = new EmbedStream(objStr.getStream(), &obj1, gTrue, - offsets[i+1] - offsets[i]); - } - parser = new Parser(xref, new Lexer(xref, str)); - parser->getObj(&objs[i]); - while (str->getChar() != EOF) ; - delete parser; - } - - gfree(offsets); - - err1: - objStr.free(); - return; -} - -ObjectStream::~ObjectStream() { - int i; - - if (objs) { - for (i = 0; i < nObjects; ++i) { - objs[i].free(); - } - delete[] objs; - } - gfree(objNums); -} - -Object *ObjectStream::getObject(int objIdx, int objNum, Object *obj) { - if (objIdx < 0 || objIdx >= nObjects || objNum != objNums[objIdx]) { - return obj->initNull(); - } - return objs[objIdx].copy(obj); -} - -//------------------------------------------------------------------------ -// XRef -//------------------------------------------------------------------------ - -XRef::XRef(BaseStream *strA, GString *ownerPassword, GString *userPassword) { - Guint pos; - Object obj; - - ok = gTrue; - errCode = errNone; - size = 0; - entries = NULL; - streamEnds = NULL; - streamEndsLen = 0; - objStr = NULL; - - // read the trailer - str = strA; - start = str->getStart(); - pos = getStartXref(); - - // if there was a problem with the 'startxref' position, try to - // reconstruct the xref table - if (pos == 0) { - if (!(ok = constructXRef())) { - errCode = errDamaged; - return; - } - - // read the xref table - } else { - while (readXRef(&pos)) ; - - // if there was a problem with the xref table, - // try to reconstruct it - if (!ok) { - if (!(ok = constructXRef())) { - errCode = errDamaged; - return; - } - } - } - - // get the root dictionary (catalog) object - trailerDict.dictLookupNF("Root", &obj); - if (obj.isRef()) { - rootNum = obj.getRefNum(); - rootGen = obj.getRefGen(); - obj.free(); - } else { - obj.free(); - if (!(ok = constructXRef())) { - errCode = errDamaged; - return; - } - } - - // now set the trailer dictionary's xref pointer so we can fetch - // indirect objects from it - trailerDict.getDict()->setXRef(this); - - // check for encryption -#ifndef NO_DECRYPTION - encrypted = gFalse; -#endif - if (checkEncrypted(ownerPassword, userPassword)) { - ok = gFalse; - errCode = errEncrypted; - return; - } -} - -XRef::~XRef() { - gfree(entries); - trailerDict.free(); - if (streamEnds) { - gfree(streamEnds); - } - if (objStr) { - delete objStr; - } -} - -// Read the 'startxref' position. -Guint XRef::getStartXref() { - char buf[xrefSearchSize+1]; - char *p; - int c, n, i; - - // read last xrefSearchSize bytes - str->setPos(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) { - return 0; - } - for (p = &buf[i+9]; isspace(*p); ++p) ; - lastXRefPos = strToUnsigned(p); - - return lastXRefPos; -} - -// Read one xref table section. Also reads the associated trailer -// dictionary, and returns the prev pointer (if any). -GBool XRef::readXRef(Guint *pos) { - Parser *parser; - Object obj; - GBool more; - - // start up a parser, parse one token - obj.initNull(); - parser = new Parser(NULL, - new Lexer(NULL, - str->makeSubStream(start + *pos, gFalse, 0, &obj))); - parser->getObj(&obj); - - // parse an old-style xref table - if (obj.isCmd("xref")) { - obj.free(); - more = readXRefTable(parser, pos); - - // parse an xref stream - } else if (obj.isInt()) { - obj.free(); - if (!parser->getObj(&obj)->isInt()) { - goto err1; - } - obj.free(); - if (!parser->getObj(&obj)->isCmd("obj")) { - goto err1; - } - obj.free(); - if (!parser->getObj(&obj)->isStream()) { - goto err1; - } - more = readXRefStream(obj.getStream(), pos); - obj.free(); - - } else { - goto err1; - } - - delete parser; - return more; - - err1: - obj.free(); - delete parser; - ok = gFalse; - return gFalse; -} - -GBool XRef::readXRefTable(Parser *parser, Guint *pos) { - XRefEntry entry; - GBool more; - Object obj, obj2; - Guint pos2; - int first, n, newSize, i; - - while (1) { - parser->getObj(&obj); - if (obj.isCmd("trailer")) { - obj.free(); - break; - } - if (!obj.isInt()) { - goto err1; - } - first = obj.getInt(); - obj.free(); - if (!parser->getObj(&obj)->isInt()) { - goto err1; - } - n = obj.getInt(); - obj.free(); - if (first < 0 || n < 0 || first + n < 0) { - goto err1; - } - if (first + n > size) { - for (newSize = size ? 2 * size : 1024; - first + n > newSize && newSize > 0; - newSize <<= 1) ; - if (newSize < 0) { - goto err1; - } - if (newSize*(int)sizeof(XRefEntry)/sizeof(XRefEntry) != newSize) { - error(-1, "Invalid 'obj' parameters'"); - goto err1; - } - - entries = (XRefEntry *)grealloc(entries, newSize * sizeof(XRefEntry)); - for (i = size; i < newSize; ++i) { - entries[i].offset = 0xffffffff; - entries[i].type = xrefEntryFree; - } - size = newSize; - } - for (i = first; i < first + n; ++i) { - if (!parser->getObj(&obj)->isInt()) { - goto err1; - } - entry.offset = (Guint)obj.getInt(); - obj.free(); - if (!parser->getObj(&obj)->isInt()) { - goto err1; - } - entry.gen = obj.getInt(); - obj.free(); - parser->getObj(&obj); - if (obj.isCmd("n")) { - entry.type = xrefEntryUncompressed; - } else if (obj.isCmd("f")) { - entry.type = xrefEntryFree; - } else { - goto err1; - } - obj.free(); - if (entries[i].offset == 0xffffffff) { - entries[i] = entry; - // PDF files of patents from the IBM Intellectual Property - // Network have a bug: the xref table claims to start at 1 - // instead of 0. - if (i == 1 && first == 1 && - entries[1].offset == 0 && entries[1].gen == 65535 && - entries[1].type == xrefEntryFree) { - i = first = 0; - entries[0] = entries[1]; - entries[1].offset = 0xffffffff; - } - } - } - } - - // read the trailer dictionary - if (!parser->getObj(&obj)->isDict()) { - goto err1; - } - - // get the 'Prev' pointer - obj.getDict()->lookupNF("Prev", &obj2); - if (obj2.isInt()) { - *pos = (Guint)obj2.getInt(); - more = gTrue; - } else if (obj2.isRef()) { - // certain buggy PDF generators generate "/Prev NNN 0 R" instead - // of "/Prev NNN" - *pos = (Guint)obj2.getRefNum(); - more = gTrue; - } else { - more = gFalse; - } - obj2.free(); - - // save the first trailer dictionary - if (trailerDict.isNone()) { - obj.copy(&trailerDict); - } - - // check for an 'XRefStm' key - if (obj.getDict()->lookup("XRefStm", &obj2)->isInt()) { - pos2 = (Guint)obj2.getInt(); - readXRef(&pos2); - if (!ok) { - goto err1; - } - } - obj2.free(); - - obj.free(); - return more; - - err1: - obj.free(); - ok = gFalse; - return gFalse; -} - -GBool XRef::readXRefStream(Stream *xrefStr, Guint *pos) { - Dict *dict; - int w[3]; - GBool more; - Object obj, obj2, idx; - int newSize, first, n, i; - - dict = xrefStr->getDict(); - - if (!dict->lookupNF("Size", &obj)->isInt()) { - goto err1; - } - newSize = obj.getInt(); - obj.free(); - if (newSize < 0) { - goto err1; - } - if (newSize > size) { - if (newSize * (int)sizeof(XRefEntry)/sizeof(XRefEntry) != newSize) { - error(-1, "Invalid 'size' parameter."); - return gFalse; - } - entries = (XRefEntry *)grealloc(entries, newSize * sizeof(XRefEntry)); - for (i = size; i < newSize; ++i) { - entries[i].offset = 0xffffffff; - entries[i].type = xrefEntryFree; - } - size = newSize; - } - - if (!dict->lookupNF("W", &obj)->isArray() || - obj.arrayGetLength() < 3) { - goto err1; - } - for (i = 0; i < 3; ++i) { - if (!obj.arrayGet(i, &obj2)->isInt()) { - obj2.free(); - goto err1; - } - w[i] = obj2.getInt(); - obj2.free(); - if (w[i] < 0 || w[i] > 4) { - goto err1; - } - } - obj.free(); - - xrefStr->reset(); - dict->lookupNF("Index", &idx); - if (idx.isArray()) { - for (i = 0; i+1 < idx.arrayGetLength(); i += 2) { - if (!idx.arrayGet(i, &obj)->isInt()) { - idx.free(); - goto err1; - } - first = obj.getInt(); - obj.free(); - if (!idx.arrayGet(i+1, &obj)->isInt()) { - idx.free(); - goto err1; - } - n = obj.getInt(); - obj.free(); - if (first < 0 || n < 0 || - !readXRefStreamSection(xrefStr, w, first, n)) { - idx.free(); - goto err0; - } - } - } else { - if (!readXRefStreamSection(xrefStr, w, 0, newSize)) { - idx.free(); - goto err0; - } - } - idx.free(); - - dict->lookupNF("Prev", &obj); - if (obj.isInt()) { - *pos = (Guint)obj.getInt(); - more = gTrue; - } else { - more = gFalse; - } - obj.free(); - if (trailerDict.isNone()) { - trailerDict.initDict(dict); - } - - return more; - - err1: - obj.free(); - err0: - ok = gFalse; - return gFalse; -} - -GBool XRef::readXRefStreamSection(Stream *xrefStr, int *w, int first, int n) { - Guint offset; - int type, gen, c, newSize, i, j; - - if (first + n < 0) { - return gFalse; - } - if (first + n > size) { - for (newSize = size ? 2 * size : 1024; - first + n > newSize && newSize > 0; - newSize <<= 1) ; - if (newSize < 0) { - return gFalse; - } - if (newSize*(int)sizeof(XRefEntry)/sizeof(XRefEntry) != newSize) { - error(-1, "Invalid 'size' inside xref table."); - return gFalse; - } - entries = (XRefEntry *)grealloc(entries, newSize * sizeof(XRefEntry)); - for (i = size; i < newSize; ++i) { - entries[i].offset = 0xffffffff; - entries[i].type = xrefEntryFree; - } - size = newSize; - } - for (i = first; i < first + n; ++i) { - if (w[0] == 0) { - type = 1; - } else { - for (type = 0, j = 0; j < w[0]; ++j) { - if ((c = xrefStr->getChar()) == EOF) { - return gFalse; - } - type = (type << 8) + c; - } - } - for (offset = 0, j = 0; j < w[1]; ++j) { - if ((c = xrefStr->getChar()) == EOF) { - return gFalse; - } - offset = (offset << 8) + c; - } - for (gen = 0, j = 0; j < w[2]; ++j) { - if ((c = xrefStr->getChar()) == EOF) { - return gFalse; - } - gen = (gen << 8) + c; - } - if (entries[i].offset == 0xffffffff) { - switch (type) { - case 0: - entries[i].offset = offset; - entries[i].gen = gen; - entries[i].type = xrefEntryFree; - break; - case 1: - entries[i].offset = offset; - entries[i].gen = gen; - entries[i].type = xrefEntryUncompressed; - break; - case 2: - entries[i].offset = offset; - entries[i].gen = gen; - entries[i].type = xrefEntryCompressed; - break; - default: - return gFalse; - } - } - } - - return gTrue; -} - -// Attempt to construct an xref table for a damaged file. -GBool XRef::constructXRef() { - Parser *parser; - Object newTrailerDict, obj; - char buf[256]; - Guint pos; - int num, gen; - int newSize; - int streamEndsSize; - char *p; - int i; - GBool gotRoot; - - gfree(entries); - size = 0; - entries = NULL; - - error(0, "PDF file is damaged - attempting to reconstruct xref table..."); - gotRoot = gFalse; - streamEndsLen = streamEndsSize = 0; - - str->reset(); - while (1) { - pos = str->getPos(); - if (!str->getLine(buf, 256)) { - break; - } - p = buf; - - // got trailer dictionary - if (!strncmp(p, "trailer", 7)) { - obj.initNull(); - parser = new Parser(NULL, - new Lexer(NULL, - str->makeSubStream(start + pos + 7, gFalse, 0, &obj))); - parser->getObj(&newTrailerDict); - if (newTrailerDict.isDict()) { - newTrailerDict.dictLookupNF("Root", &obj); - if (obj.isRef()) { - rootNum = obj.getRefNum(); - rootGen = obj.getRefGen(); - if (!trailerDict.isNone()) { - trailerDict.free(); - } - newTrailerDict.copy(&trailerDict); - gotRoot = gTrue; - } - obj.free(); - } - newTrailerDict.free(); - delete parser; - - // look for object - } else if (isdigit(*p)) { - num = atoi(p); - if (num > 0) { - do { - ++p; - } while (*p && isdigit(*p)); - if (isspace(*p)) { - do { - ++p; - } while (*p && isspace(*p)); - if (isdigit(*p)) { - gen = atoi(p); - do { - ++p; - } while (*p && isdigit(*p)); - if (isspace(*p)) { - do { - ++p; - } while (*p && isspace(*p)); - if (!strncmp(p, "obj", 3)) { - if (num >= size) { - newSize = (num + 1 + 255) & ~255; - if (newSize < 0) { - error(-1, "Bad object number"); - return gFalse; - } - if (newSize*(int)sizeof(XRefEntry)/sizeof(XRefEntry) != newSize) { - error(-1, "Invalid 'obj' parameters."); - return gFalse; - } - entries = (XRefEntry *) - grealloc(entries, newSize * sizeof(XRefEntry)); - for (i = size; i < newSize; ++i) { - entries[i].offset = 0xffffffff; - entries[i].type = xrefEntryFree; - } - size = newSize; - } - if (entries[num].type == xrefEntryFree || - gen >= entries[num].gen) { - entries[num].offset = pos - start; - entries[num].gen = gen; - entries[num].type = xrefEntryUncompressed; - } - } - } - } - } - } - - } else if (!strncmp(p, "endstream", 9)) { - if (streamEndsLen == streamEndsSize) { - streamEndsSize += 64; - if (streamEndsSize*(int)sizeof(int)/sizeof(int) != streamEndsSize) { - error(-1, "Invalid 'endstream' parameter."); - return gFalse; - } - streamEnds = (Guint *)grealloc(streamEnds, - streamEndsSize * sizeof(int)); - } - streamEnds[streamEndsLen++] = pos; - } - } - - if (gotRoot) - return gTrue; - - error(-1, "Couldn't find trailer dictionary"); - return gFalse; -} - -#ifndef NO_DECRYPTION -GBool XRef::checkEncrypted(GString *ownerPassword, GString *userPassword) { - Object encrypt, filterObj, versionObj, revisionObj, lengthObj; - Object ownerKey, userKey, permissions, fileID, fileID1; - GBool encrypted1; - GBool ret; - - keyLength = 0; - encVersion = encRevision = 0; - ret = gFalse; - - permFlags = defPermFlags; - ownerPasswordOk = gFalse; - trailerDict.dictLookup("Encrypt", &encrypt); - if ((encrypted1 = encrypt.isDict())) { - ret = gTrue; - encrypt.dictLookup("Filter", &filterObj); - if (filterObj.isName("Standard")) { - encrypt.dictLookup("V", &versionObj); - encrypt.dictLookup("R", &revisionObj); - encrypt.dictLookup("Length", &lengthObj); - encrypt.dictLookup("O", &ownerKey); - encrypt.dictLookup("U", &userKey); - encrypt.dictLookup("P", &permissions); - trailerDict.dictLookup("ID", &fileID); - if (versionObj.isInt() && - revisionObj.isInt() && - ownerKey.isString() && ownerKey.getString()->getLength() == 32 && - userKey.isString() && userKey.getString()->getLength() == 32 && - permissions.isInt() && - fileID.isArray()) { - encVersion = versionObj.getInt(); - encRevision = revisionObj.getInt(); - if (lengthObj.isInt()) { - keyLength = lengthObj.getInt() / 8; - } else { - keyLength = 5; - } - if (keyLength > 16) { - keyLength = 16; - } - permFlags = permissions.getInt(); - if (encVersion >= 1 && encVersion <= 2 && - encRevision >= 2 && encRevision <= 3) { - fileID.arrayGet(0, &fileID1); - if (fileID1.isString()) { - if (Decrypt::makeFileKey(encVersion, encRevision, keyLength, - ownerKey.getString(), userKey.getString(), - permFlags, fileID1.getString(), - ownerPassword, userPassword, fileKey, - &ownerPasswordOk)) { - if (ownerPassword && !ownerPasswordOk) { - error(-1, "Incorrect owner password"); - } - ret = gFalse; - } else { - error(-1, "Incorrect password"); - } - } else { - error(-1, "Weird encryption info"); - } - fileID1.free(); - } else { - error(-1, "Unsupported version/revision (%d/%d) of Standard security handler", - encVersion, encRevision); - } - } else { - error(-1, "Weird encryption info"); - } - fileID.free(); - permissions.free(); - userKey.free(); - ownerKey.free(); - lengthObj.free(); - revisionObj.free(); - versionObj.free(); - } else { - error(-1, "Unknown security handler '%s'", - filterObj.isName() ? filterObj.getName() : "???"); - } - filterObj.free(); - } - encrypt.free(); - - // this flag has to be set *after* we read the O/U/P strings - encrypted = encrypted1; - - return ret; -} -#else -GBool XRef::checkEncrypted(GString *ownerPassword, GString *userPassword) { - Object obj; - GBool encrypted; - - trailerDict.dictLookup("Encrypt", &obj); - if ((encrypted = !obj.isNull())) { - error(-1, "PDF file is encrypted and this version of the Xpdf tools"); - error(-1, "was built without decryption support."); - } - obj.free(); - return encrypted; -} -#endif - -GBool XRef::okToPrint(GBool ignoreOwnerPW) { -#ifndef NO_DECRYPTION - return (!ignoreOwnerPW && ownerPasswordOk) || (permFlags & permPrint); -#else - return gTrue; -#endif -} - -GBool XRef::okToChange(GBool ignoreOwnerPW) { -#ifndef NO_DECRYPTION - return (!ignoreOwnerPW && ownerPasswordOk) || (permFlags & permChange); -#else - return gTrue; -#endif -} - -GBool XRef::okToCopy(GBool ignoreOwnerPW) { -#ifndef NO_DECRYPTION - return (!ignoreOwnerPW && ownerPasswordOk) || (permFlags & permCopy); -#else - return gTrue; -#endif -} - -GBool XRef::okToAddNotes(GBool ignoreOwnerPW) { -#ifndef NO_DECRYPTION - return (!ignoreOwnerPW && ownerPasswordOk) || (permFlags & permNotes); -#else - return gTrue; -#endif -} - -Object *XRef::fetch(int num, int gen, Object *obj) { - XRefEntry *e; - Parser *parser; - Object obj1, obj2, obj3; - - // check for bogus ref - this can happen in corrupted PDF files - if (num < 0 || num >= size) { - goto err; - } - - e = &entries[num]; - switch (e->type) { - - case xrefEntryUncompressed: - if (e->gen != gen) { - goto err; - } - obj1.initNull(); - parser = new Parser(this, - new Lexer(this, - str->makeSubStream(start + e->offset, gFalse, 0, &obj1))); - parser->getObj(&obj1); - parser->getObj(&obj2); - parser->getObj(&obj3); - if (!obj1.isInt() || obj1.getInt() != num || - !obj2.isInt() || obj2.getInt() != gen || - !obj3.isCmd("obj")) { - goto err; - } -#ifndef NO_DECRYPTION - parser->getObj(obj, encrypted ? fileKey : (Guchar *)NULL, keyLength, - num, gen); -#else - parser->getObj(obj); -#endif - obj1.free(); - obj2.free(); - obj3.free(); - delete parser; - break; - - case xrefEntryCompressed: - if (gen != 0) { - goto err; - } - if (!objStr || objStr->getObjStrNum() != (int)e->offset) { - if (objStr) { - delete objStr; - } - objStr = new ObjectStream(this, e->offset); - } - objStr->getObject(e->gen, num, obj); - break; - - default: - goto err; - } - - return obj; - - err: - return obj->initNull(); -} - -Object *XRef::getDocInfo(Object *obj) { - return trailerDict.dictLookup("Info", obj); -} - -// Added for the pdftex project. -Object *XRef::getDocInfoNF(Object *obj) { - return trailerDict.dictLookupNF("Info", obj); -} - -GBool XRef::getStreamEnd(Guint streamStart, Guint *streamEnd) { - int a, b, m; - - if (streamEndsLen == 0 || - streamStart > streamEnds[streamEndsLen - 1]) { - return gFalse; - } - - a = -1; - b = streamEndsLen - 1; - // invariant: streamEnds[a] < streamStart <= streamEnds[b] - while (b - a > 1) { - m = (a + b) / 2; - if (streamStart <= streamEnds[m]) { - b = m; - } else { - a = m; - } - } - *streamEnd = streamEnds[b]; - return gTrue; -} - -Guint XRef::strToUnsigned(char *s) { - Guint x; - char *p; - int i; - - x = 0; - for (p = s, i = 0; *p && isdigit(*p) && i < 10; ++p, ++i) { - x = 10 * x + (*p - '0'); - } - return x; -} |