1 files changed, 90 insertions, 0 deletions
diff --git a/toolkit/components/url-classifier/nsUrlClassifierPrefixSet.h b/toolkit/components/url-classifier/nsUrlClassifierPrefixSet.h
new file mode 100644
index 0000000000..dac631359e
--- /dev/null
+++ b/toolkit/components/url-classifier/nsUrlClassifierPrefixSet.h
@@ -0,0 +1,90 @@
+//* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=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 nsUrlClassifierPrefixSet_h_
+#define nsUrlClassifierPrefixSet_h_
+
+#include "nsIUrlClassifierPrefixSet.h"
+#include "nsISupports.h"
+#include "nsToolkitCompsCID.h"
+#include "nsString.h"
+#include "nsTArray.h"
+#include "mozilla/FileUtils.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/Poison.h"
+
+class nsIInputStream;
+class nsIOutputStream;
+
+namespace mozilla {
+namespace safebrowsing {
+
+class VariableLengthPrefixSet;
+
+}  // namespace safebrowsing
+}  // namespace mozilla
+
+class nsUrlClassifierPrefixSet final : public nsIUrlClassifierPrefixSet {
+ public:
+  nsUrlClassifierPrefixSet();
+
+  NS_IMETHOD Init(const nsACString& aName) override;
+  NS_IMETHOD SetPrefixes(const uint32_t* aArray, uint32_t aLength) override;
+  NS_IMETHOD GetPrefixes(uint32_t* aCount, uint32_t** aPrefixes) override;
+  NS_IMETHOD Contains(uint32_t aPrefix, bool* aFound) override;
+  NS_IMETHOD IsEmpty(bool* aEmpty) override;
+
+  nsresult GetPrefixesNative(FallibleTArray<uint32_t>& aOutArray);
+  nsresult GetPrefixByIndex(uint32_t aIndex, uint32_t* aOutPrefix) const;
+  nsresult WritePrefixes(nsCOMPtr<nsIOutputStream>& out) const;
+  nsresult LoadPrefixes(nsCOMPtr<nsIInputStream>& in);
+  uint32_t CalculatePreallocateSize() const;
+  uint32_t Length() const;
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  friend class mozilla::safebrowsing::VariableLengthPrefixSet;
+
+ private:
+  virtual ~nsUrlClassifierPrefixSet();
+
+  static const uint32_t DELTAS_LIMIT = 120;
+  static const uint32_t MAX_INDEX_DIFF = (1 << 16);
+  static const uint32_t PREFIXSET_VERSION_MAGIC = 1;
+
+  void Clear() MOZ_REQUIRES(mLock);
+  nsresult MakePrefixSet(const uint32_t* aArray, uint32_t aLength)
+      MOZ_REQUIRES(mLock);
+  uint32_t BinSearch(uint32_t start, uint32_t end, uint32_t target) const
+      MOZ_REQUIRES(mLock);
+  bool IsEmptyInternal() const MOZ_REQUIRES(mLock);
+
+  // Lock to prevent races between the url-classifier thread (which does most
+  // of the operations) and the main thread (which does memory reporting).
+  // It should be held for all operations between Init() and destruction that
+  // touch this class's data members.
+  mutable mozilla::Mutex mLock;
+  // list of fully stored prefixes, that also form the
+  // start of a run of deltas in mIndexDeltas.
+  nsTArray<uint32_t> mIndexPrefixes MOZ_GUARDED_BY(mLock);
+  // array containing arrays of deltas from indices.
+  // Index to the place that matches the closest lower
+  // prefix from mIndexPrefix. Then every "delta" corresponds
+  // to a prefix in the PrefixSet.
+  // This array could be empty when we decide to store all the prefixes
+  // in mIndexPrefixes.
+  nsTArray<nsTArray<uint16_t> > mIndexDeltas MOZ_GUARDED_BY(mLock);
+
+  // how many prefixes we have.
+  uint32_t mTotalPrefixes MOZ_GUARDED_BY(mLock);
+
+  nsCString mName;  // Set in Init() only
+  mozilla::CorruptionCanary mCanary;
+};
+
+#endif