1 files changed, 71 insertions, 0 deletions
diff --git a/toolkit/xre/dllservices/ModuleVersionInfo.h b/toolkit/xre/dllservices/ModuleVersionInfo.h
new file mode 100644
index 0000000000..2b46817417
--- /dev/null
+++ b/toolkit/xre/dllservices/ModuleVersionInfo.h
@@ -0,0 +1,71 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+#ifndef mozilla_ModuleVersionInfo_h
+#define mozilla_ModuleVersionInfo_h
+
+#include <windows.h>
+#include "nsString.h"
+
+namespace mozilla {
+
+// Obtains basic version info from a module image's version info resource.
+class ModuleVersionInfo {
+ public:
+  // We favor English(US) for these fields, otherwise we take the first
+  // translation provided in the version resource.
+  nsString mCompanyName;
+  nsString mProductName;
+  nsString mLegalCopyright;
+  nsString mFileDescription;
+
+  // Represents an A.B.C.D style version number, internally stored as a uint64_t
+  class VersionNumber {
+    uint64_t mVersion64 = 0;
+
+   public:
+    VersionNumber() = default;
+
+    VersionNumber(DWORD aMostSig, DWORD aLeastSig)
+        : mVersion64((uint64_t)aMostSig << 32 | aLeastSig) {}
+
+    uint16_t A() const {
+      return (uint16_t)((mVersion64 & 0xffff000000000000) >> 48);
+    }
+
+    uint16_t B() const {
+      return (uint16_t)((mVersion64 & 0x0000ffff00000000) >> 32);
+    }
+
+    uint16_t C() const {
+      return (uint16_t)((mVersion64 & 0x00000000ffff0000) >> 16);
+    }
+
+    uint16_t D() const { return (uint16_t)(mVersion64 & 0x000000000000ffff); }
+
+    uint64_t Version64() const { return mVersion64; }
+
+    bool operator==(const VersionNumber& aOther) const {
+      return mVersion64 == aOther.mVersion64;
+    }
+
+    nsCString ToString() const {
+      nsCString ret;
+      ret.AppendPrintf("%d.%d.%d.%d", (int)A(), (int)B(), (int)C(), (int)D());
+      return ret;
+    }
+  };
+
+  VersionNumber mFileVersion;
+  VersionNumber mProductVersion;
+
+  // Returns false if it has no version resource or has no fixed version info.
+  bool GetFromImage(const nsAString& aPath);
+};
+
+}  // namespace mozilla
+
+#endif  // mozilla_ModuleVersionInfo_h