hsbench: add Hyperscan benchmarker

The hsbench tool provides an easy way to measure Hyperscan's
performance for a particular set of patterns and corpus of data
to be scanned.

util/expression_path.h

@@ -0,0 +1,107 @@
+/*
+ * Copyright (c) 2015-2016, 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.
+ */
+
+#ifndef EXPRESSION_PATH_H
+#define EXPRESSION_PATH_H
+
+#include "ue2common.h"
+
+#include <cerrno>
+#include <cstring>
+#include <iostream>
+#include <string>
+#include <vector>
+
+#include <sys/stat.h>
+#if !defined(_WIN32)
+#include <unistd.h>
+#include <libgen.h>
+#endif
+
+//
+// Utility functions
+//
+
+/**
+ * Given a path to a signature file, infer the path of the pcre directory.
+ */
+static inline
+std::string inferExpressionPath(const std::string &sigFile) {
+#ifndef _WIN32
+    // POSIX variant.
+
+    // dirname() may modify its argument, so we must make a copy.
+    std::vector<char> path(sigFile.size() + 1);
+    memcpy(path.data(), sigFile.c_str(), sigFile.size());
+    path[sigFile.size()] = 0; // ensure null termination.
+
+    std::string rv = dirname(path.data());
+#else
+    // Windows variant.
+    if (sigFile.size() >= _MAX_DIR) {
+        return std::string();
+    }
+    char path[_MAX_DIR];
+    _splitpath(sigFile.c_str(), nullptr, path, nullptr, nullptr);
+    std::string rv(path);
+#endif
+
+    rv += "/../pcre";
+    return rv;
+}
+
+#if defined(_WIN32)
+#define stat _stat
+#define S_IFREG _S_IFREG
+#endif
+
+static inline
+bool isDir(const std::string &filename) {
+    struct stat s;
+
+    if (stat(filename.c_str(), &s) == -1) {
+        std::cerr << "stat: " << strerror(errno) << std::endl;
+        return false;
+    }
+
+    return (S_IFDIR & s.st_mode);
+}
+
+static inline
+bool isFile(const std::string &filename) {
+    struct stat s;
+
+    if (stat(filename.c_str(), &s) == -1) {
+        std::cerr << "stat: " << strerror(errno) << std::endl;
+        return false;
+    }
+
+    return (S_IFREG & s.st_mode);
+}
+
+#endif /* EXPRESSION_PATH_H */