Initial commit of Hyperscan

src/nfa/repeatcompile.h

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+/*
+ * Copyright (c) 2015, Intel Corporation
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *  * Redistributions of source code must retain the above copyright notice,
+ *    this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *  * Neither the name of Intel Corporation nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/** \file
+ * \brief Bounded repeat compile-time code.
+ */
+
+#ifndef REPEATCOMPILE_H
+#define REPEATCOMPILE_H
+
+#include "repeat_internal.h"
+
+#include <cstdint>
+#include <utility>
+#include <vector>
+
+namespace ue2 {
+
+class CharReach;
+class depth;
+
+/**
+ * \brief Structure representing the various state requirements for a given
+ * bounded repeat.
+ */
+struct RepeatStateInfo {
+    RepeatStateInfo(enum RepeatType type, const depth &repeatMin,
+                    const depth &repeatMax, u32 minPeriod);
+
+    u32 stateSize;
+    u32 packedCtrlSize;
+    u32 horizon;
+    u32 patchCount;
+    u32 patchSize;
+    u32 encodingSize;
+    u32 patchesOffset;
+    std::vector<u32> packedFieldSizes;
+    std::vector<uint64_t> table; // not u64a, for boost/gcc-4.9
+};
+
+/**
+ * \brief Given the parameters of a repeat, choose a repeat implementation
+ * type.
+ */
+enum RepeatType chooseRepeatType(const depth &repeatMin, const depth &repeatMax,
+                                 u32 minPeriod, bool is_reset);
+
+u32 calcPackedBytes(u64a val);
+
+bool matches(std::vector<CharReach>::const_iterator a_it,
+             std::vector<CharReach>::const_iterator a_ite,
+             std::vector<CharReach>::const_iterator b_it,
+             std::vector<CharReach>::const_iterator b_ite);
+
+std::vector<size_t>
+minResetDistToEnd(const std::vector<std::vector<CharReach>> &triggers,
+                  const CharReach &cr);
+
+u32 minPeriod(const std::vector<std::vector<CharReach>> &triggers,
+              const CharReach &cr, bool *can_reset);
+
+} // namespace ue2
+
+#endif // REPEATCOMPILE_H