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[/] [s6soc/] [trunk/] [sw/] [host/] [byteswap.cpp] - Rev 48

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////////////////////////////////////////////////////////////////////////////////
//
// Filename: 	byteswap.cpp
//
// Project:	OpenArty, an entirely open SoC based upon the Arty platform
//
// Purpose:	
//
// Creator:	Dan Gisselquist, Ph.D.
//		Gisselquist Technology, LLC
//
////////////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2015-2016, Gisselquist Technology, LLC
//
// This program is free software (firmware): you can redistribute it and/or
// modify it under the terms of  the GNU General Public License as published
// by the Free Software Foundation, either version 3 of the License, or (at
// your option) any later version.
//
// This program is distributed in the hope that it will be useful, but WITHOUT
// ANY WARRANTY; without even the implied warranty of MERCHANTIBILITY or
// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
// for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program.  (It's in the $(ROOT)/doc directory, run make with no
// target there if the PDF file isn't present.)  If not, see
// <http://www.gnu.org/licenses/> for a copy.
//
// License:	GPL, v3, as defined and found on www.gnu.org,
//		http://www.gnu.org/licenses/gpl.html
//
//
////////////////////////////////////////////////////////////////////////////////
//
//
#include <stdint.h>
#include "byteswap.h"
 
uint32_t
byteswap(uint32_t v) {
	uint32_t	r = 0;
 
	r = (v & 0x0ff);
	r <<= 8; v >>= 8;
	r |= (v & 0x0ff);
	r <<= 8; v >>= 8;
	r |= (v & 0x0ff);
	r <<= 8; v >>= 8;
	r |= (v & 0x0ff);
 
	return r;
}
 
uint32_t
buildword(const unsigned char *p) {
	uint32_t	r = 0;
 
	r  = (*p++); r <<= 8;
	r |= (*p++); r <<= 8;
	r |= (*p++); r <<= 8;
	r |= (*p  );
 
	return r;
}
 
uint32_t
buildswap(const unsigned char *p) {
	uint32_t	r = 0;
 
	r  = p[3]; r <<= 8;
	r |= p[2]; r <<= 8;
	r |= p[1]; r <<= 8;
	r |= p[0];
 
	return r;
}
 
void
byteswapbuf(int ln, uint32_t *buf) {
	for(int i=0; i<ln; i++)
		buf[i] = byteswap(buf[i]);
}
 
 
 

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