litex/tools/byteswap.c

61 lines
1.5 KiB
C

/*
* MiSoC
* 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;
}