1 files changed, 52 insertions, 28 deletions

diff --git a/noncore/unsupported/qpdf/xpdf/XRef.cc b/noncore/unsupported/qpdf/xpdf/XRef.cc
index 5d526e9..0e1bbc9 100644
--- a/noncore/unsupported/qpdf/xpdf/XRef.cc
+++ b/noncore/unsupported/qpdf/xpdf/XRef.cc
@@ -1,11 +1,11 @@
 //========================================================================
 //
 // XRef.cc
 //
-// Copyright 1996 Derek B. Noonburg
+// Copyright 1996-2002 Glyph & Cog, LLC
 //
 //========================================================================
 
 #ifdef __GNUC__
 #pragma implementation
 #endif
@@ -22,12 +22,13 @@
 #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'
@@ -46,16 +47,17 @@
 
 //------------------------------------------------------------------------
 // XRef
 //------------------------------------------------------------------------
 
 XRef::XRef(BaseStream *strA, GString *ownerPassword, GString *userPassword) {
-  int pos;
+  Guint pos;
   int i;
 
   ok = gTrue;
+  errCode = errNone;
   size = 0;
   entries = NULL;
   streamEnds = NULL;
   streamEndsLen = 0;
 
   // read the trailer
@@ -64,31 +66,33 @@ XRef::XRef(BaseStream *strA, GString *ownerPassword, GString *userPassword) {
   pos = readTrailer();
 
   // if there was a problem with the trailer,
   // try to reconstruct the xref table
   if (pos == 0) {
     if (!(ok = constructXRef())) {
+      errCode = errDamaged;
       return;
     }
 
   // trailer is ok - read the xref table
   } else {
     entries = (XRefEntry *)gmalloc(size * sizeof(XRefEntry));
     for (i = 0; i < size; ++i) {
-      entries[i].offset = -1;
+      entries[i].offset = 0xffffffff;
       entries[i].used = gFalse;
     }
     while (readXRef(&pos)) ;
 
     // if there was a problem with the xref table,
     // try to reconstruct it
     if (!ok) {
       gfree(entries);
       size = 0;
       entries = NULL;
       if (!(ok = constructXRef())) {
+	errCode = errDamaged;
 	return;
       }
     }
   }
 
   // now set the trailer dictionary's xref pointer so we can fetch
@@ -98,12 +102,13 @@ XRef::XRef(BaseStream *strA, GString *ownerPassword, GString *userPassword) {
   // check for encryption
 #ifndef NO_DECRYPTION
   encrypted = gFalse;
 #endif
   if (checkEncrypted(ownerPassword, userPassword)) {
     ok = gFalse;
+    errCode = errEncrypted;
     return;
   }
 }
 
 XRef::~XRef() {
   gfree(entries);
@@ -112,23 +117,24 @@ XRef::~XRef() {
     gfree(streamEnds);
   }
 }
 
 // Read startxref position, xref table size, and root.  Returns
 // first xref position.
-int XRef::readTrailer() {
+Guint XRef::readTrailer() {
   Parser *parser;
   Object obj;
   char buf[xrefSearchSize+1];
-  int n, pos, pos1;
+  int n;
+  Guint pos, pos1;
   char *p;
   int c;
   int i;
 
   // read last xrefSearchSize bytes
-  str->setPos(-xrefSearchSize);
+  str->setPos(xrefSearchSize, -1);
   for (n = 0; n < xrefSearchSize; ++n) {
     if ((c = str->getChar()) == EOF)
       break;
     buf[n] = c;
   }
   buf[n] = '\0';
@@ -138,13 +144,13 @@ int XRef::readTrailer() {
     if (!strncmp(&buf[i], "startxref", 9))
       break;
   }
   if (i < 0)
     return 0;
   for (p = &buf[i+9]; isspace(*p); ++p) ;
-  pos = lastXRefPos = atoi(p);
+  pos = lastXRefPos = strToUnsigned(p);
 
   // find trailer dict by looking after first xref table
   // (NB: we can't just use the trailer dict at the end of the file --
   // this won't work for linearized files.)
   str->setPos(start + pos);
   for (i = 0; i < 4; ++i)
@@ -173,14 +179,15 @@ int XRef::readTrailer() {
     pos1 += (p - buf) + n * 20;
   }
   pos1 += 7;
 
   // read trailer dict
   obj.initNull();
-  parser = new Parser(NULL, new Lexer(NULL, str->makeSubStream(start + pos1,
-							       -1, &obj)));
+  parser = new Parser(NULL,
+	     new Lexer(NULL,
+	       str->makeSubStream(start + pos1, gFalse, 0, &obj)));
   parser->getObj(&trailerDict);
   if (trailerDict.isDict()) {
     trailerDict.dictLookupNF("Size", &obj);
     if (obj.isInt())
       size = obj.getInt();
     else
@@ -201,13 +208,13 @@ int XRef::readTrailer() {
 
   // return first xref position
   return pos;
 }
 
 // Read an xref table and the prev pointer from the trailer.
-GBool XRef::readXRef(int *pos) {
+GBool XRef::readXRef(Guint *pos) {
   Parser *parser;
   Object obj, obj2;
   char s[20];
   GBool more;
   int first, newSize, n, i, j;
   int c;
@@ -258,27 +265,27 @@ GBool XRef::readXRef(int *pos) {
     // check for buggy PDF files with an incorrect (too small) xref
     // table size
     if (first + n > size) {
       newSize = size + 256;
       entries = (XRefEntry *)grealloc(entries, newSize * sizeof(XRefEntry));
       for (i = size; i < newSize; ++i) {
-	entries[i].offset = -1;
+	entries[i].offset = 0xffffffff;
 	entries[i].used = gFalse;
       }
       size = newSize;
     }
     for (i = first; i < first + n; ++i) {
       for (j = 0; j < 20; ++j) {
 	if ((c = str->getChar()) == EOF) {
 	  goto err2;
 	}
 	s[j] = (char)c;
       }
-      if (entries[i].offset < 0) {
+      if (entries[i].offset == 0xffffffff) {
 	s[10] = '\0';
-	entries[i].offset = atoi(s);
+	entries[i].offset = strToUnsigned(s);
 	s[16] = '\0';
 	entries[i].gen = atoi(&s[11]);
 	if (s[17] == 'n') {
 	  entries[i].used = gTrue;
 	} else if (s[17] == 'f') {
 	  entries[i].used = gFalse;
@@ -290,34 +297,35 @@ GBool XRef::readXRef(int *pos) {
 	// instead of 0.
 	if (i == 1 && first == 1 &&
 	    entries[1].offset == 0 && entries[1].gen == 65535 &&
 	    !entries[1].used) {
 	  i = first = 0;
 	  entries[0] = entries[1];
-	  entries[1].offset = -1;
+	  entries[1].offset = 0xffffffff;
 	}
       }
     }
   }
 
   // read prev pointer from trailer dictionary
   obj.initNull();
-  parser = new Parser(NULL, new Lexer(NULL, str->makeSubStream(str->getPos(),
-							       -1, &obj)));
+  parser = new Parser(NULL,
+	     new Lexer(NULL,
+	       str->makeSubStream(str->getPos(), gFalse, 0, &obj)));
   parser->getObj(&obj);
   if (!obj.isCmd("trailer")) {
     goto err1;
   }
   obj.free();
   parser->getObj(&obj);
   if (!obj.isDict()) {
     goto err1;
   }
   obj.getDict()->lookupNF("Prev", &obj2);
   if (obj2.isInt()) {
-    *pos = obj2.getInt();
+    *pos = (Guint)obj2.getInt();
     more = gTrue;
   } else {
     more = gFalse;
   }
   obj.free();
   obj2.free();
@@ -334,13 +342,13 @@ GBool XRef::readXRef(int *pos) {
 
 // Attempt to construct an xref table for a damaged file.
 GBool XRef::constructXRef() {
   Parser *parser;
   Object obj;
   char buf[256];
-  int pos;
+  Guint pos;
   int num, gen;
   int newSize;
   int streamEndsSize;
   char *p;
   int i;
   GBool gotRoot;
@@ -357,14 +365,15 @@ GBool XRef::constructXRef() {
     }
     p = buf;
 
     // got trailer dictionary
     if (!strncmp(p, "trailer", 7)) {
       obj.initNull();
-      parser = new Parser(NULL, new Lexer(NULL,
-		      str->makeSubStream(start + pos + 7, -1, &obj)));
+      parser = new Parser(NULL,
+		 new Lexer(NULL,
+		   str->makeSubStream(start + pos + 7, gFalse, 0, &obj)));
       if (!trailerDict.isNone())
 	trailerDict.free();
       parser->getObj(&trailerDict);
       if (trailerDict.isDict()) {
 	trailerDict.dictLookupNF("Root", &obj);
 	if (obj.isRef()) {
@@ -400,13 +409,13 @@ GBool XRef::constructXRef() {
 	    if (!strncmp(p, "obj", 3)) {
 	      if (num >= size) {
 		newSize = (num + 1 + 255) & ~255;
 		entries = (XRefEntry *)
 		            grealloc(entries, newSize * sizeof(XRefEntry));
 		for (i = size; i < newSize; ++i) {
-		  entries[i].offset = -1;
+		  entries[i].offset = 0xffffffff;
 		  entries[i].used = gFalse;
 		}
 		size = newSize;
 	      }
 	      if (!entries[num].used || gen >= entries[num].gen) {
 		entries[num].offset = pos - start;
@@ -418,13 +427,14 @@ GBool XRef::constructXRef() {
 	}
       }
 
     } else if (!strncmp(p, "endstream", 9)) {
       if (streamEndsLen == streamEndsSize) {
 	streamEndsSize += 64;
-	streamEnds = (int *)grealloc(streamEnds, streamEndsSize * sizeof(int));
+	streamEnds = (Guint *)grealloc(streamEnds,
+				       streamEndsSize * sizeof(int));
       }
       streamEnds[streamEndsLen++] = pos;
     }
   }
 
   if (gotRoot)
@@ -577,16 +587,17 @@ Object *XRef::fetch(int num, int gen, Object *obj) {
   if (num < 0 || num >= size) {
     obj->initNull();
     return obj;
   }
 
   e = &entries[num];
-  if (e->gen == gen && e->offset >= 0) {
+  if (e->gen == gen && e->offset != 0xffffffff) {
     obj1.initNull();
-    parser = new Parser(this, new Lexer(this,
-	           str->makeSubStream(start + e->offset, -1, &obj1)));
+    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")) {
@@ -615,18 +626,18 @@ Object *XRef::getDocInfo(Object *obj) {
 
 // Added for the pdftex project.
 Object *XRef::getDocInfoNF(Object *obj) {
   return trailerDict.dictLookupNF("Info", obj);
 }
 
-int XRef::getStreamEnd(int streamStart) {
+GBool XRef::getStreamEnd(Guint streamStart, Guint *streamEnd) {
   int a, b, m;
 
   if (streamEndsLen == 0 ||
       streamStart > streamEnds[streamEndsLen - 1]) {
-    return -1;
+    return gFalse;
   }
 
   a = -1;
   b = streamEndsLen - 1;
   // invariant: streamEnds[a] < streamStart <= streamEnds[b]
   while (b - a > 1) {
@@ -634,8 +645,21 @@ int XRef::getStreamEnd(int streamStart) {
     if (streamStart <= streamEnds[m]) {
       b = m;
     } else {
       a = m;
     }
   }
-  return streamEnds[b];
+  *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;
 }