Initial commit of Hyperscan

src/util/unaligned.h

@@ -0,0 +1,98 @@
+/*
+ * 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 Helper functions for unaligned loads and stores.
+ */
+
+#ifndef UNALIGNED_H
+#define UNALIGNED_H
+
+#include "ue2common.h"
+
+#if !defined(_WIN32)
+#define PACKED__MAY_ALIAS __attribute__((packed, may_alias))
+#else
+#define PACKED__MAY_ALIAS
+#pragma pack(push, 1) // pack everything until told otherwise
+#endif
+
+/// Perform an unaligned 16-bit load
+static really_inline
+u16 unaligned_load_u16(const void *ptr) {
+    struct unaligned { u16 u; } PACKED__MAY_ALIAS;
+    const struct unaligned *uptr = (const struct unaligned *)ptr;
+    return uptr->u;
+}
+
+/// Perform an unaligned 32-bit load
+static really_inline
+u32 unaligned_load_u32(const void *ptr) {
+    struct unaligned { u32 u; } PACKED__MAY_ALIAS;
+    const struct unaligned *uptr = (const struct unaligned *)ptr;
+    return uptr->u;
+}
+
+/// Perform an unaligned 64-bit load
+static really_inline
+u64a unaligned_load_u64a(const void *ptr) {
+    struct unaligned { u64a u; } PACKED__MAY_ALIAS;
+    const struct unaligned *uptr = (const struct unaligned *)ptr;
+    return uptr->u;
+}
+
+/// Perform an unaligned 16-bit store
+static really_inline
+void unaligned_store_u16(void *ptr, u16 val) {
+    struct unaligned { u16 u; } PACKED__MAY_ALIAS;
+    struct unaligned *uptr = (struct unaligned *)ptr;
+    uptr->u = val;
+}
+
+/// Perform an unaligned 32-bit store
+static really_inline
+void unaligned_store_u32(void *ptr, u32 val) {
+    struct unaligned { u32 u; } PACKED__MAY_ALIAS;
+    struct unaligned *uptr = (struct unaligned *)ptr;
+    uptr->u = val;
+}
+
+/// Perform an unaligned 64-bit store
+static really_inline
+void unaligned_store_u64a(void *ptr, u64a val) {
+    struct unaligned { u64a u; } PACKED__MAY_ALIAS;
+    struct unaligned *uptr = (struct unaligned *)ptr;
+    uptr->u = val;
+}
+#if defined(_WIN32)
+#pragma pack(pop)
+#endif // win32
+
+#undef PACKED__MAY_ALIAS
+
+#endif // UNALIGNED_H