Ignore unused field in xref entry, avoiding range error (fixes #482)

4 files changed, 17 insertions, 2 deletions

diff --git a/qpdf/qtest/qpdf.test b/qpdf/qtest/qpdf.test
index 8254013b..1c136126 100644
--- a/qpdf/qtest/qpdf.test
+++ b/qpdf/qtest/qpdf.test
@@ -1496,7 +1496,7 @@ $td->runtest("detect loops in pages structure",
 show_ntests();
 # ----------
 $td->notify("--- Xref ---");
-$n_tests += 5;
+$n_tests += 6;
 
 # Handle file with invalid xref table and object 0 as a regular object
 # (bug 3159950).
@@ -1538,6 +1538,12 @@ $td->runtest("show number of pages",
              {$td->STRING => "20\n", $td->EXIT_STATUS => 0},
              $td->NORMALIZE_NEWLINES);
 
+# Issue 482 -- don't range check fields[2] for xref entry type 0.
+$td->runtest("out of range in deleted object",
+             {$td->COMMAND => "qpdf --check xref-range.pdf"},
+             {$td->FILE => "xref-range.out", $td->EXIT_STATUS => 0},
+             $td->NORMALIZE_NEWLINES);
+
 show_ntests();
 # ----------
 $td->notify("--- Overwrite self ---");
diff --git a/qpdf/qtest/qpdf/issue-150.out b/qpdf/qtest/qpdf/issue-150.out
index 862b4d1e..f45a0977 100644
--- a/qpdf/qtest/qpdf/issue-150.out
+++ b/qpdf/qtest/qpdf/issue-150.out
@@ -1,2 +1,5 @@
 WARNING: issue-150.pdf: can't find PDF header
-overflow/underflow converting 9900000000000000000 to 64-bit integer
+WARNING: issue-150.pdf: file is damaged
+WARNING: issue-150.pdf: error reading xref: overflow/underflow converting 9900000000000000000 to 64-bit integer
+WARNING: issue-150.pdf: Attempting to reconstruct cross-reference table
+issue-150.pdf: unable to find trailer dictionary while recovering damaged file
diff --git a/qpdf/qtest/qpdf/xref-range.out b/qpdf/qtest/qpdf/xref-range.out
new file mode 100644
index 00000000..cb72e559
--- /dev/null
+++ b/qpdf/qtest/qpdf/xref-range.out
@@ -0,0 +1,6 @@
+checking xref-range.pdf
+PDF Version: 1.5
+File is not encrypted
+File is not linearized
+No syntax or stream encoding errors found; the file may still contain
+errors that qpdf cannot detect
diff --git a/qpdf/qtest/qpdf/xref-range.pdf b/qpdf/qtest/qpdf/xref-range.pdf
new file mode 100644
index 00000000..8a1413d0
--- /dev/null
+++ b/qpdf/qtest/qpdf/xref-range.pdf