1 files changed, 73 insertions, 0 deletions
diff --git a/toolkit/components/url-classifier/VariableLengthPrefixSet.h b/toolkit/components/url-classifier/VariableLengthPrefixSet.h
new file mode 100644
index 0000000000..2593267163
--- /dev/null
+++ b/toolkit/components/url-classifier/VariableLengthPrefixSet.h
@@ -0,0 +1,73 @@
+//* -*- 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 VariableLengthPrefixSet_h
+#define VariableLengthPrefixSet_h
+
+#include "nsISupports.h"
+#include "nsIMemoryReporter.h"
+#include "Entries.h"
+#include "nsTArray.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/Mutex.h"
+
+class nsUrlClassifierPrefixSet;
+
+namespace mozilla {
+namespace safebrowsing {
+
+class VariableLengthPrefixSet final : public nsIMemoryReporter {
+ public:
+  VariableLengthPrefixSet();
+
+  nsresult Init(const nsACString& aName);
+  nsresult SetPrefixes(mozilla::safebrowsing::PrefixStringMap& aPrefixMap);
+  nsresult SetPrefixes(AddPrefixArray& aAddPrefixes,
+                       AddCompleteArray& aAddCompletes);
+  nsresult GetPrefixes(mozilla::safebrowsing::PrefixStringMap& aPrefixMap);
+  nsresult GetFixedLengthPrefixes(FallibleTArray<uint32_t>* aPrefixes,
+                                  FallibleTArray<nsCString>* aCompletes);
+  nsresult GetFixedLengthPrefixByIndex(uint32_t aIndex,
+                                       uint32_t* aOutPrefix) const;
+  nsresult Matches(uint32_t aPrefix, const nsACString& aFullHash,
+                   uint32_t* aLength) const;
+  nsresult IsEmpty(bool* aEmpty) const;
+
+  nsresult WritePrefixes(nsCOMPtr<nsIOutputStream>& out) const;
+  nsresult LoadPrefixes(nsCOMPtr<nsIInputStream>& in);
+  uint32_t CalculatePreallocateSize() const;
+  uint32_t FixedLengthPrefixLength() const;
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
+
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIMEMORYREPORTER
+
+ private:
+  virtual ~VariableLengthPrefixSet();
+
+  static const uint32_t PREFIXSET_VERSION_MAGIC = 1;
+
+  bool BinarySearch(const nsACString& aFullHash, const nsACString& aPrefixes,
+                    uint32_t aPrefixSize) const;
+
+  // 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 MOZ_UNANNOTATED;
+
+  const RefPtr<nsUrlClassifierPrefixSet> mFixedPrefixSet;
+  mozilla::safebrowsing::PrefixStringMap mVLPrefixSet;
+
+  nsCString mName;
+  nsCString mMemoryReportPath;
+};
+
+}  // namespace safebrowsing
+}  // namespace mozilla
+
+#endif