61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/*
|
|
* Milkymist SoC
|
|
* Copyright (C) 2007, 2008, 2009, 2010 Sebastien Bourdeauducq
|
|
*
|
|
* This program is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, version 3 of the License.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY 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. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
FILE *fdi, *fdo;
|
|
unsigned short wi;
|
|
unsigned short wo;
|
|
int i;
|
|
|
|
if(argc != 3) {
|
|
fprintf(stderr, "Usage: byteswap <infile> <outfile>\n");
|
|
return 1;
|
|
}
|
|
fdi = fopen(argv[1], "rb");
|
|
if(!fdi) {
|
|
perror("Unable to open input file");
|
|
return 1;
|
|
}
|
|
fdo = fopen(argv[2], "w");
|
|
if(!fdo) {
|
|
perror("Unable to open output file");
|
|
fclose(fdi);
|
|
return 1;
|
|
}
|
|
while(1) {
|
|
if(fread(&wi, 2, 1, fdi) <= 0) break;
|
|
wo = 0;
|
|
for(i=0;i<16;i++)
|
|
if(wi & (1 << i))
|
|
wo |= (0x8000 >> i);
|
|
/* comment out the next line on big endian machines! */
|
|
wo = ((wo & 0x00ff) << 8) | ((wo & 0xff00) >> 8);
|
|
fwrite(&wo, 2, 1, fdo);
|
|
}
|
|
fclose(fdi);
|
|
if(fclose(fdo) != 0) {
|
|
perror("Unable to close output file");
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|