Bug 1867315 - Check ENDSIG for ZIP64 too r=necko-reviewers,valentin

Differential Revision: https://phabricator.services.mozilla.com/D195109

modules/libjar/nsZipArchive.cpp

@@ -715,7 +715,7 @@ nsresult nsZipArchive::BuildFileList(PRFileDesc* aFd)
     sig = 0;
   } /* while reading central directory records */
 
-  if (sig != ENDSIG) {
+  if (sig != ENDSIG && sig != ENDSIG64) {
     return NS_ERROR_FILE_CORRUPTED;
   }
 

modules/libjar/zipstruct.h

@@ -83,6 +83,7 @@ typedef struct ZipEnd_ {
 #define LOCALSIG 0x04034B50l
 #define CENTRALSIG 0x02014B50l
 #define ENDSIG 0x06054B50l
+#define ENDSIG64 0x6064B50l
 
 /* extra fields */
 #define EXTENDED_TIMESTAMP_FIELD 0x5455