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/*
* 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 FDR_LOADVAL_H
#define FDR_LOADVAL_H
#include "ue2common.h"
#include "util/unaligned.h"
#define MAKE_LOADVAL(type, name) \
static really_inline \
type name(const u8 *ptr, UNUSED const u8 *lo, UNUSED const u8 *hi)
#define NORMAL_SAFE(type) \
do { \
assert(ptr >= lo); \
assert(ptr + sizeof(type) - 1 < hi); \
} while(0)
#define MAKE_LOOP_CE(TYPE) \
TYPE v = 0; \
for (TYPE i = 0; i < sizeof(TYPE); i++) { \
if ((lo <= ptr + i) && (ptr + i < hi)) { \
v += (TYPE)ptr[i] << (i*8); \
} \
} \
return v;
// no suffix = normal (unaligned)
// _ce = cautious everywhere (in both directions); test against hi and lo
MAKE_LOADVAL(u16, lv_u16) {
NORMAL_SAFE(u16);
return unaligned_load_u16(ptr);
}
MAKE_LOADVAL(u64a, lv_u64a) {
NORMAL_SAFE(u32);
return unaligned_load_u64a(ptr);
}
MAKE_LOADVAL(u16, lv_u16_ce) { MAKE_LOOP_CE(u16); }
MAKE_LOADVAL(u64a, lv_u64a_ce) { MAKE_LOOP_CE(u64a); }
#endif
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