61 lines
1.5 KiB
C
61 lines
1.5 KiB
C
/*
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* MiSoC
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* Copyright (C) 2007, 2008, 2009, 2010 Sebastien Bourdeauducq
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program 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
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <stdio.h>
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int main(int argc, char *argv[])
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{
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FILE *fdi, *fdo;
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unsigned short wi;
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unsigned short wo;
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int i;
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if(argc != 3) {
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fprintf(stderr, "Usage: byteswap <infile> <outfile>\n");
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return 1;
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}
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fdi = fopen(argv[1], "rb");
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if(!fdi) {
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perror("Unable to open input file");
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return 1;
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}
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fdo = fopen(argv[2], "w");
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if(!fdo) {
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perror("Unable to open output file");
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fclose(fdi);
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return 1;
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}
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while(1) {
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if(fread(&wi, 2, 1, fdi) <= 0) break;
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wo = 0;
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for(i=0;i<16;i++)
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if(wi & (1 << i))
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wo |= (0x8000 >> i);
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/* comment out the next line on big endian machines! */
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wo = ((wo & 0x00ff) << 8) | ((wo & 0xff00) >> 8);
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fwrite(&wo, 2, 1, fdo);
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}
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fclose(fdi);
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if(fclose(fdo) != 0) {
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perror("Unable to close output file");
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return 1;
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}
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return 0;
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}
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