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-rw-r--r--kpdf/xpdf/xpdf/XRef.cc917
1 files changed, 917 insertions, 0 deletions
diff --git a/kpdf/xpdf/xpdf/XRef.cc b/kpdf/xpdf/xpdf/XRef.cc
new file mode 100644
index 00000000..d12d812f
--- /dev/null
+++ b/kpdf/xpdf/xpdf/XRef.cc
@@ -0,0 +1,917 @@
+//========================================================================
+//
+// 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"
+#include "Error.h"
+#include "ErrorCodes.h"
+#include "XRef.h"
+
+//------------------------------------------------------------------------
+
+#define xrefSearchSize 1024 // read this many bytes at end of file
+ // to look for 'startxref'
+
+//------------------------------------------------------------------------
+// Permission bits
+//------------------------------------------------------------------------
+
+#define permPrint (1<<2)
+#define permChange (1<<3)
+#define permCopy (1<<4)
+#define permNotes (1<<5)
+#define defPermFlags 0xfffc
+
+//------------------------------------------------------------------------
+// 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;
+ }
+
+ objs = new Object[nObjects];
+ objNums = (int *)gmallocn(nObjects, sizeof(int));
+ offsets = (int *)gmallocn(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), gFalse);
+ 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), gFalse);
+ 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) {
+ Guint pos;
+ Object obj;
+
+ ok = gTrue;
+ errCode = errNone;
+ size = 0;
+ entries = NULL;
+ streamEnds = NULL;
+ streamEndsLen = 0;
+ objStr = NULL;
+
+ encrypted = gFalse;
+ permFlags = defPermFlags;
+ ownerPasswordOk = gFalse;
+
+ // 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);
+}
+
+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)),
+ gTrue);
+ 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;
+ }
+ entries = (XRefEntry *)greallocn(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) {
+ obj2.free();
+ 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) {
+ entries = (XRefEntry *)greallocn(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;
+ }
+ entries = (XRefEntry *)greallocn(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(-1, "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;
+
+ // skip whitespace
+ while (*p && Lexer::isSpace(*p & 0xff)) ++p;
+
+ // got trailer dictionary
+ if (!strncmp(p, "trailer", 7)) {
+ obj.initNull();
+ parser = new Parser(NULL,
+ new Lexer(NULL,
+ str->makeSubStream(pos + 7, gFalse, 0, &obj)),
+ gFalse);
+ 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;
+ }
+ entries = (XRefEntry *)
+ greallocn(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;
+ streamEnds = (Guint *)greallocn(streamEnds,
+ streamEndsSize, sizeof(int));
+ }
+ streamEnds[streamEndsLen++] = pos;
+ }
+ }
+
+ if (gotRoot)
+ return gTrue;
+
+ error(-1, "Couldn't find trailer dictionary");
+ return gFalse;
+}
+
+void XRef::setEncryption(int permFlagsA, GBool ownerPasswordOkA,
+ Guchar *fileKeyA, int keyLengthA, int encVersionA,
+ CryptAlgorithm encAlgorithmA) {
+ int i;
+
+ encrypted = gTrue;
+ permFlags = permFlagsA;
+ ownerPasswordOk = ownerPasswordOkA;
+ if (keyLengthA <= 16) {
+ keyLength = keyLengthA;
+ } else {
+ keyLength = 16;
+ }
+ for (i = 0; i < keyLength; ++i) {
+ fileKey[i] = fileKeyA[i];
+ }
+ encVersion = encVersionA;
+ encAlgorithm = encAlgorithmA;
+}
+
+GBool XRef::okToPrint(GBool ignoreOwnerPW) {
+ return (!ignoreOwnerPW && ownerPasswordOk) || (permFlags & permPrint);
+}
+
+GBool XRef::okToChange(GBool ignoreOwnerPW) {
+ return (!ignoreOwnerPW && ownerPasswordOk) || (permFlags & permChange);
+}
+
+GBool XRef::okToCopy(GBool ignoreOwnerPW) {
+ return (!ignoreOwnerPW && ownerPasswordOk) || (permFlags & permCopy);
+}
+
+GBool XRef::okToAddNotes(GBool ignoreOwnerPW) {
+ return (!ignoreOwnerPW && ownerPasswordOk) || (permFlags & permNotes);
+}
+
+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)),
+ gTrue);
+ parser->getObj(&obj1);
+ parser->getObj(&obj2);
+ parser->getObj(&obj3);
+ if (!obj1.isInt() || obj1.getInt() != num ||
+ !obj2.isInt() || obj2.getInt() != gen ||
+ !obj3.isCmd("obj")) {
+ obj1.free();
+ obj2.free();
+ obj3.free();
+ delete parser;
+ goto err;
+ }
+ parser->getObj(obj, encrypted ? fileKey : (Guchar *)NULL,
+ encAlgorithm, keyLength, num, gen);
+ 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;
+}
+
+int XRef::getNumEntry(Guint offset) const
+{
+ if (size > 0)
+ {
+ int res = 0;
+ Guint resOffset = entries[0].offset;
+ XRefEntry e;
+ for (int i = 1; i < size; ++i)
+ {
+ e = entries[i];
+ if (e.offset < offset && e.offset >= resOffset)
+ {
+ res = i;
+ resOffset = e.offset;
+ }
+ }
+ return res;
+ }
+ else return -1;
+}
+
+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;
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-16 22:51:52 +0000