chimera: hybrid of Hyperscan and PCRE

chimera/ch_database.c

@@ -0,0 +1,126 @@
+/*
+ * Copyright (c) 2018, 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 Chimera: database construction, etc.
+ */
+
+#include <limits.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "allocator.h"
+#include "database.h"
+#include "hs.h"
+#include "ch.h"
+#include "hs_internal.h"
+#include "ch_common.h"
+#include "ch_alloc.h"
+#include "ch_database.h"
+#include "ch_internal.h"
+
+static really_inline
+int db_correctly_aligned(const void *db) {
+    return ISALIGNED_N(db, alignof(unsigned long long));
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_free_database(ch_database_t *hydb) {
+    if (hydb && hydb->magic != CH_DB_MAGIC) {
+        return CH_INVALID;
+    }
+    ch_database_free(hydb);
+
+    return CH_SUCCESS;
+}
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_database_size(const ch_database_t *hydb, size_t *size) {
+    if (!size) {
+        return CH_INVALID;
+    }
+
+    ch_error_t ret = hydbIsValid(hydb);
+    if (unlikely(ret != CH_SUCCESS)) {
+        return ret;
+    }
+
+    *size = sizeof(struct ch_database) + hydb->length;
+    return CH_SUCCESS;
+}
+
+/** \brief Identifier prepended to database info. */
+static const char CHIMERA_IDENT[] = "Chimera ";
+
+HS_PUBLIC_API
+ch_error_t HS_CDECL ch_database_info(const ch_database_t *hydb, char **info) {
+    if (!info) {
+        return CH_INVALID;
+    }
+    *info = NULL;
+
+    if (!hydb || !db_correctly_aligned(hydb) || hydb->magic != CH_DB_MAGIC) {
+        return HS_INVALID;
+    }
+
+    const struct ch_bytecode *bytecode = ch_get_bytecode(hydb);
+    char noMulti = (bytecode->flags & CHIMERA_FLAG_NO_MULTIMATCH);
+    if (noMulti) {
+        size_t len = strlen(CHIMERA_IDENT);
+        *info = ch_misc_alloc(len + 1);
+        if (!(*info)) {
+            return CH_INVALID;
+        }
+        memcpy((*info), CHIMERA_IDENT, len);
+        (*info)[len] = '\0';
+        return CH_SUCCESS;
+    }
+
+    char *hsinfo = NULL;
+    hs_error_t ret = hs_database_info(getHyperscanDatabase(bytecode), &hsinfo);
+    if (ret != HS_SUCCESS) {
+        assert(!hsinfo);
+        return ret;
+    }
+
+    size_t hybridlen = strlen(CHIMERA_IDENT);
+    size_t hslen = strlen(hsinfo);
+    *info = ch_misc_alloc(hybridlen + hslen + 1);
+    if (!(*info)) {
+        ch_misc_free(hsinfo);
+        return CH_INVALID;
+    }
+
+    memcpy((*info), CHIMERA_IDENT, hybridlen);
+    memcpy((*info) + hybridlen, hsinfo, hslen);
+    (*info)[hybridlen + hslen] = '\0';
+    ch_misc_free(hsinfo);
+
+    return CH_SUCCESS;
+}