Avoid signed integer overflow when calculating filesizes for VMS's ftp listings.

net/ftp/ftp_directory_listing_parser_vms_unittest.cc

Index: net/ftp/ftp_directory_listing_parser_vms_unittest.cc
diff --git a/net/ftp/ftp_directory_listing_parser_vms_unittest.cc b/net/ftp/ftp_directory_listing_parser_vms_unittest.cc
index f566481b5487d67f47a83e32526c3466d581f793..d54e06bcd5af6098afcf6dfcb0960cb96d1796ed 100644
--- a/net/ftp/ftp_directory_listing_parser_vms_unittest.cc
+++ b/net/ftp/ftp_directory_listing_parser_vms_unittest.cc
@@ -76,37 +76,46 @@ TEST_F(FtpDirectoryListingParserVmsTest, Good) {
 
 TEST_F(FtpDirectoryListingParserVmsTest, Bad) {
   const char* const bad_cases[] = {
-    "garbage",
-
-    // Missing file version number.
-    "README.TXT 2 18-APR-2000 10:40:39",
-
-    // Missing extension.
-    "README;1 2 18-APR-2000 10:40:39",
-
-    // Malformed file size.
-    "README.TXT;1 garbage 18-APR-2000 10:40:39",
-    "README.TXT;1 -2 18-APR-2000 10:40:39",
-
-    // Malformed date.
-    "README.TXT;1 2 APR-2000 10:40:39",
-    "README.TXT;1 2 -18-APR-2000 10:40:39",
-    "README.TXT;1 2 18-APR 10:40:39",
-    "README.TXT;1 2 18-APR-2000 10",
-    "README.TXT;1 2 18-APR-2000 10:40.25",
-    "README.TXT;1 2 18-APR-2000 10:40.25.25",
-
-    // Malformed security information.
-    "X.TXT;2 1 12-MAR-2005 08:44:57 (RWED,RWED,RE,RE)",
-    "X.TXT;2 1 12-MAR-2005 08:44:57 [SYSTEM]",
-    "X.TXT;2 1 12-MAR-2005 08:44:57 (SYSTEM) (RWED,RWED,RE,RE)",
-    "X.TXT;2 1 12-MAR-2005 08:44:57 [SYSTEM] [RWED,RWED,RE,RE]",
-    "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED)",
-    "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED,RWED,RE,RE,RE)",
-    "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED,RWEDRWED,RE,RE)",
-    "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED,DEWR,RE,RE)",
-    "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED,RWED,Q,RE)",
-    "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED,RRWWEEDD,RE,RE)",
+      "garbage",
+
+      // Missing file version number.
+      "README.TXT 2 18-APR-2000 10:40:39",
+
+      // Missing extension.
+      "README;1 2 18-APR-2000 10:40:39",
+
+      // Malformed file size.
+      "README.TXT;1 garbage 18-APR-2000 10:40:39",
+      "README.TXT;1 -2 18-APR-2000 10:40:39",
+
+      // Malformed date.
+      "README.TXT;1 2 APR-2000 10:40:39",
+      "README.TXT;1 2 -18-APR-2000 10:40:39", "README.TXT;1 2 18-APR 10:40:39",
+      "README.TXT;1 2 18-APR-2000 10", "README.TXT;1 2 18-APR-2000 10:40.25",
+      "README.TXT;1 2 18-APR-2000 10:40.25.25",
+
+      // Malformed security information.
+      "X.TXT;2 1 12-MAR-2005 08:44:57 (RWED,RWED,RE,RE)",
+      "X.TXT;2 1 12-MAR-2005 08:44:57 [SYSTEM]",
+      "X.TXT;2 1 12-MAR-2005 08:44:57 (SYSTEM) (RWED,RWED,RE,RE)",
+      "X.TXT;2 1 12-MAR-2005 08:44:57 [SYSTEM] [RWED,RWED,RE,RE]",
+      "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED)",
+      "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED,RWED,RE,RE,RE)",
+      "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED,RWEDRWED,RE,RE)",
+      "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED,DEWR,RE,RE)",
+      "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED,RWED,Q,RE)",
+      "X.TXT;2 1 12-MAR-2005 08:44:57 [X] (RWED,RRWWEEDD,RE,RE)",
+
+      // Block size is too large, leading to overflow when calculating
+      // file size.
+      "README.TXT;1  9223372036854775807  18-APR-2000 10:40:39.90",
+      "README.TXT;1  9223372036854775807/9223372036854775807  18-APR-2000 "
+      "10:40:39.90",
+
+      // Block size is too large (bigger than int64 max)
+      "README.TXT;1  19223372036854775807  18-APR-2000 10:40:39.90",
+      "README.TXT;1  19223372036854775807/19223372036854775807  18-APR-2000 "

[mmenke, 2017/01/04 19:07:24]

Also a test where block site is not too large (Nor is block size * 512), but
block allocation size is?  (Admittedly, weird case).

[eroman, 2017/01/04 20:16:58]

Done.

+      "10:40:39.90",
   };
   for (size_t i = 0; i < arraysize(bad_cases); i++) {
     SCOPED_TRACE(base::StringPrintf("Test[%" PRIuS "]: %s", i, bad_cases[i]));