1 files changed, 108 insertions, 0 deletions
diff --git a/dom/quota/UsageInfo.h b/dom/quota/UsageInfo.h
new file mode 100644
index 000000000..9d34f1bff
--- /dev/null
+++ b/dom/quota/UsageInfo.h
@@ -0,0 +1,108 @@
+/* -*- 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/. */
+
+#ifndef mozilla_dom_quota_usageinfo_h__
+#define mozilla_dom_quota_usageinfo_h__
+
+#include "mozilla/dom/quota/QuotaCommon.h"
+
+#include "mozilla/Atomics.h"
+#include "mozilla/CheckedInt.h"
+
+BEGIN_QUOTA_NAMESPACE
+
+class UsageInfo
+{
+public:
+  UsageInfo()
+    : mDatabaseUsage(0)
+    , mFileUsage(0)
+    , mLimit(0)
+  { }
+
+  virtual ~UsageInfo()
+  { }
+
+  void
+  Append(const UsageInfo& aUsageInfo)
+  {
+    IncrementUsage(&mDatabaseUsage, aUsageInfo.mDatabaseUsage);
+    IncrementUsage(&mFileUsage, aUsageInfo.mFileUsage);
+  }
+
+  void
+  AppendToDatabaseUsage(uint64_t aUsage)
+  {
+    IncrementUsage(&mDatabaseUsage, aUsage);
+  }
+
+  void
+  AppendToFileUsage(uint64_t aUsage)
+  {
+    IncrementUsage(&mFileUsage, aUsage);
+  }
+
+  void
+  SetLimit(uint64_t aLimit)
+  {
+    mLimit = aLimit;
+  }
+
+  uint64_t
+  DatabaseUsage()
+  {
+    return mDatabaseUsage;
+  }
+
+  uint64_t
+  FileUsage()
+  {
+    return mFileUsage;
+  }
+
+  uint64_t
+  Limit()
+  {
+    return mLimit;
+  }
+
+  uint64_t
+  TotalUsage()
+  {
+    uint64_t totalUsage = mDatabaseUsage;
+    IncrementUsage(&totalUsage, mFileUsage);
+    return totalUsage;
+  }
+
+  void
+  ResetUsage()
+  {
+    mDatabaseUsage = 0;
+    mFileUsage = 0;
+  }
+
+  static void
+  IncrementUsage(uint64_t* aUsage, uint64_t aDelta)
+  {
+    MOZ_ASSERT(aUsage);
+    CheckedUint64 value = *aUsage;
+    value += aDelta;
+    if (value.isValid()) {
+      *aUsage = value.value();
+    } else {
+      *aUsage = UINT64_MAX;
+    }
+  }
+
+private:
+  uint64_t mDatabaseUsage;
+  uint64_t mFileUsage;
+  uint64_t mLimit;
+};
+
+END_QUOTA_NAMESPACE
+
+#endif // mozilla_dom_quota_usageinfo_h__