Allow trailing . in numeric token (fixes #165)

ChangeLog

@@ -1,10 +1,13 @@
 2018-01-13  Jay Berkenbilt  <ejb@ql.org>
 
+	* Fix lexical error: the PDF specification allows floating point
+	numbers to end with ".". Fixes #165.
+
 	* Fix link order in the build to avoid conflicts when building
-	from source while an older version of qpdf is installed.
+	from source while an older version of qpdf is installed. Fixes #158.
 
 	* Add support for TIFF predictor for LZW and Flate streams. Now
-	all predictor functions are supported.
+	all predictor functions are supported. Fixes #171.
 
 2017-12-25  Jay Berkenbilt  <ejb@ql.org>
 

libqpdf/QUtil.cc

@@ -558,7 +558,7 @@ QUtil::is_digit(char ch)
 bool
 QUtil::is_number(char const* p)
 {
-    // ^[\+\-]?(\.\d+|\d+(\.\d+)?)$
+    // ^[\+\-]?(\.\d*|\d+(\.\d*)?)$
     if (! *p)
     {
         return false;
@@ -578,11 +578,6 @@ QUtil::is_number(char const* p)
                 // only one dot
                 return false;
             }
-            if (! *(p+1))
-            {
-                // dot can't be last
-                return false;
-            }
             found_dot = true;
         }
         else if (QUtil::is_digit(*p))

qpdf/qtest/qpdf/good10.out

@@ -1,8 +1,12 @@
 /QTest is direct and has type array (8)
-/QTest is an array with 3 items
+/QTest is an array with 7 items
   item 0 is direct
   item 1 is direct
   item 2 is indirect
-unparse: [ 1 (2) 8 0 R ]
-unparseResolved: [ 1 (2) 8 0 R ]
+  item 3 is direct
+  item 4 is direct
+  item 5 is direct
+  item 6 is direct
+unparse: [ 1 (2) 8 0 R 0.0 -0.0 0. -0. ]
+unparseResolved: [ 1 (2) 8 0 R 0.0 -0.0 0. -0. ]
 test 1 done

qpdf/qtest/qpdf/good10.pdf

@@ -73,7 +73,7 @@ xref
 trailer <<
   /Size 7
   /Root 1 0 R
-  /QTest [1 (2) 8 0 R]
+  /QTest [1 (2) 8 0 R 0.0 -0.0 0. -0.]
 >>
 startxref
 556

qpdf/qtest/qpdf/good10.qdf

@@ -96,6 +96,10 @@ trailer <<
     1
     (2)
     null
+    0.0
+    -0.0
+    0.
+    -0.
   ]
   /Root 1 0 R
   /Size 8