1 files changed, 88 insertions, 0 deletions
diff --git a/toolkit/components/aboutthirdparty/MsiDatabase.cpp b/toolkit/components/aboutthirdparty/MsiDatabase.cpp
new file mode 100644
index 0000000000..6c667072b7
--- /dev/null
+++ b/toolkit/components/aboutthirdparty/MsiDatabase.cpp
@@ -0,0 +1,88 @@
+/* -*- 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 http://mozilla.org/MPL/2.0/. */
+
+#include "MsiDatabase.h"
+
+#ifdef UNICODE
+#  define MSIDBOPEN_READONLY_W MSIDBOPEN_READONLY
+#  define INSTALLPROPERTY_LOCALPACKAGE_W INSTALLPROPERTY_LOCALPACKAGE
+#else
+// MSIDBOPEN_READONLY is defined as `(LPCTSTR)0` in msiquery.h, so we need to
+// cast it to LPCWSTR.
+#  define MSIDBOPEN_READONLY_W reinterpret_cast<LPCWSTR>(MSIDBOPEN_READONLY)
+// INSTALLPROPERTY_LOCALPACKAGE is defined as `__TEXT("LocalPackage")` in msi.h,
+// so we need to define a wchar_t version.
+#  define INSTALLPROPERTY_LOCALPACKAGE_W L"LocalPackage"
+#endif  // UNICODE
+
+namespace mozilla {
+
+/*static*/
+UniquePtr<wchar_t[]> MsiDatabase::GetRecordString(MSIHANDLE aRecord,
+                                                  UINT aFieldIndex) {
+  // The 3rd parameter of MsiRecordGetStringW must not be nullptr.
+  wchar_t kEmptyString[] = L"";
+  DWORD len = 0;
+  UINT ret = ::MsiRecordGetStringW(aRecord, aFieldIndex, kEmptyString, &len);
+  if (ret != ERROR_MORE_DATA) {
+    return nullptr;
+  }
+
+  // |len| returned from MsiRecordGetStringW does not include
+  // a null-character, but a length to pass to MsiRecordGetStringW
+  // needs to include a null-character.
+  ++len;
+
+  auto buf = MakeUnique<wchar_t[]>(len);
+  ret = ::MsiRecordGetStringW(aRecord, aFieldIndex, buf.get(), &len);
+  if (ret != ERROR_SUCCESS) {
+    return nullptr;
+  }
+
+  return buf;
+}
+
+MsiDatabase::MsiDatabase(const wchar_t* aDatabasePath) {
+  MSIHANDLE handle = 0;
+  UINT ret = ::MsiOpenDatabaseW(aDatabasePath, MSIDBOPEN_READONLY_W, &handle);
+  if (ret != ERROR_SUCCESS) {
+    return;
+  }
+
+  mDatabase.own(handle);
+}
+
+Maybe<MsiDatabase> MsiDatabase::FromProductId(const wchar_t* aProductId) {
+  DWORD len = MAX_PATH;
+  wchar_t bufStack[MAX_PATH];
+  UINT ret = ::MsiGetProductInfoW(aProductId, INSTALLPROPERTY_LOCALPACKAGE_W,
+                                  bufStack, &len);
+  if (ret == ERROR_SUCCESS) {
+    return Some(MsiDatabase(bufStack));
+  }
+
+  if (ret != ERROR_MORE_DATA) {
+    return Nothing();
+  }
+
+  // |len| returned from MsiGetProductInfoW does not include
+  // a null-character, but a length to pass to MsiGetProductInfoW
+  // needs to include a null-character.
+  ++len;
+
+  std::unique_ptr<wchar_t[]> bufHeap(new wchar_t[len]);
+  ret = ::MsiGetProductInfoW(aProductId, INSTALLPROPERTY_LOCALPACKAGE_W,
+                             bufHeap.get(), &len);
+  if (ret == ERROR_SUCCESS) {
+    return Some(MsiDatabase(bufHeap.get()));
+  }
+
+  return Nothing();
+}
+
+MsiDatabase::operator bool() const { return !!mDatabase; }
+
+}  // namespace mozilla