hscollider: tool for testing Hyperscan match behaviour against PCRE

tools/hscollider/pcre_util.cpp

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+/*
+ * Copyright (c) 2015-2017, 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.
+ */
+
+#include "pcre_util.h"
+
+#include "hs.h"
+
+#include <assert.h>
+#include <pcre.h> /* for pcre flags */
+
+bool getPcreFlags(unsigned int hs_flags, unsigned int *flags,
+                  bool *highlander, bool *prefilter, bool *som) {
+    assert(flags);
+    assert(highlander);
+    assert(prefilter);
+    assert(som);
+    *flags = 0;
+    *highlander = false;
+    *prefilter = false;
+    *som = false;
+
+    if (hs_flags & HS_FLAG_CASELESS) {
+        *flags |= PCRE_CASELESS;
+        hs_flags &= ~HS_FLAG_CASELESS;
+    }
+    if (hs_flags & HS_FLAG_DOTALL) {
+        *flags |= PCRE_DOTALL;
+        hs_flags &= ~HS_FLAG_DOTALL;
+    }
+    if (hs_flags & HS_FLAG_MULTILINE) {
+        *flags |= PCRE_MULTILINE;
+        hs_flags &= ~HS_FLAG_MULTILINE;
+    }
+    if (hs_flags & HS_FLAG_UCP) {
+        *flags |= PCRE_UCP;
+        hs_flags &= ~HS_FLAG_UCP;
+    }
+    if (hs_flags & HS_FLAG_UTF8) {
+        *flags |= PCRE_UTF8;
+        hs_flags &= ~HS_FLAG_UTF8;
+    }
+    if (hs_flags & HS_FLAG_SINGLEMATCH) {
+        *highlander = true;
+        hs_flags &= ~HS_FLAG_SINGLEMATCH;
+    }
+    if (hs_flags & HS_FLAG_PREFILTER) {
+        *prefilter = true;
+        hs_flags &= ~HS_FLAG_PREFILTER;
+    }
+    if (hs_flags & HS_FLAG_SOM_LEFTMOST) {
+        *som = true;
+        hs_flags &= ~HS_FLAG_SOM_LEFTMOST;
+    }
+
+    // Flags that are irrelevant to PCRE.
+    hs_flags &= ~HS_FLAG_ALLOWEMPTY;
+
+    if (hs_flags) {
+        // You've added new flags, haven't you?
+        assert(0);
+        return false;
+    }
+
+    return true;
+}