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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 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
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