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/*
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byteswap.h - functions and macros for byte swapping.
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Copyright (C) 1995 - 2001 Michael Riepe
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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/* @(#) $Id: byteswap.h,v 1.7 2008/05/23 08:15:34 michael Exp $ */
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#ifndef _BYTESWAP_H
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#define _BYTESWAP_H
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#define lu(from,i,s) (((__libelf_u32_t)((unsigned char*)(from))[i])<<(s))
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#define li(from,i,s) (((__libelf_i32_t)(( signed char*)(from))[i])<<(s))
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#define __load_u16L(from) ((__libelf_u32_t) \
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(lu(from,1,8) | lu(from,0,0)))
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#define __load_u16M(from) ((__libelf_u32_t) \
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(lu(from,0,8) | lu(from,1,0)))
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#define __load_i16L(from) ((__libelf_i32_t) \
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(li(from,1,8) | lu(from,0,0)))
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#define __load_i16M(from) ((__libelf_i32_t) \
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(li(from,0,8) | lu(from,1,0)))
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#define __load_u32L(from) ((__libelf_u32_t) \
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(lu(from,3,24) | lu(from,2,16) | lu(from,1,8) | lu(from,0,0)))
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#define __load_u32M(from) ((__libelf_u32_t) \
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(lu(from,0,24) | lu(from,1,16) | lu(from,2,8) | lu(from,3,0)))
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#define __load_i32L(from) ((__libelf_i32_t) \
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(li(from,3,24) | lu(from,2,16) | lu(from,1,8) | lu(from,0,0)))
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#define __load_i32M(from) ((__libelf_i32_t) \
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(li(from,0,24) | lu(from,1,16) | lu(from,2,8) | lu(from,3,0)))
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#define su(to,i,v,s) (((char*)(to))[i]=((__libelf_u32_t)(v)>>(s)))
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#define si(to,i,v,s) (((char*)(to))[i]=((__libelf_i32_t)(v)>>(s)))
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#define __store_u16L(to,v) \
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(su(to,1,v,8), su(to,0,v,0))
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#define __store_u16M(to,v) \
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(su(to,0,v,8), su(to,1,v,0))
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#define __store_i16L(to,v) \
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(si(to,1,v,8), si(to,0,v,0))
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#define __store_i16M(to,v) \
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(si(to,0,v,8), si(to,1,v,0))
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#define __store_u32L(to,v) \
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(su(to,3,v,24), su(to,2,v,16), su(to,1,v,8), su(to,0,v,0))
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#define __store_u32M(to,v) \
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(su(to,0,v,24), su(to,1,v,16), su(to,2,v,8), su(to,3,v,0))
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#define __store_i32L(to,v) \
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(si(to,3,v,24), si(to,2,v,16), si(to,1,v,8), si(to,0,v,0))
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#define __store_i32M(to,v) \
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(si(to,0,v,24), si(to,1,v,16), si(to,2,v,8), si(to,3,v,0))
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#if __LIBELF64
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/*
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* conversion functions from swap64.c
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*/
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extern __libelf_u64_t _elf_load_u64L(const unsigned char *from);
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extern __libelf_u64_t _elf_load_u64M(const unsigned char *from);
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extern __libelf_i64_t _elf_load_i64L(const unsigned char *from);
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extern __libelf_i64_t _elf_load_i64M(const unsigned char *from);
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extern void _elf_store_u64L(unsigned char *to, __libelf_u64_t v);
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extern void _elf_store_u64M(unsigned char *to, __libelf_u64_t v);
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extern void _elf_store_i64L(unsigned char *to, __libelf_u64_t v);
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extern void _elf_store_i64M(unsigned char *to, __libelf_u64_t v);
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/*
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* aliases for existing conversion code
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*/
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#define __load_u64L _elf_load_u64L
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#define __load_u64M _elf_load_u64M
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#define __load_i64L _elf_load_i64L
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#define __load_i64M _elf_load_i64M
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#define __store_u64L _elf_store_u64L
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#define __store_u64M _elf_store_u64M
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#define __store_i64L _elf_store_i64L
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#define __store_i64M _elf_store_i64M
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#endif /* __LIBELF64 */
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#endif /* _BYTESWAP_H */
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