|
| 1 | +/* |
| 2 | + * Milkymist SoC |
| 3 | + * Copyright (C) 2007, 2008, 2009, 2010 Sebastien Bourdeauducq |
| 4 | + * |
| 5 | + * This program is free software: you can redistribute it and/or modify |
| 6 | + * it under the terms of the GNU General Public License as published by |
| 7 | + * the Free Software Foundation, version 3 of the License. |
| 8 | + * |
| 9 | + * This program is distributed in the hope that it will be useful, |
| 10 | + * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | + * GNU General Public License for more details. |
| 13 | + * |
| 14 | + * You should have received a copy of the GNU General Public License |
| 15 | + * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| 16 | + */ |
| 17 | + |
| 18 | +#include <stdlib.h> |
| 19 | +#include <string.h> |
| 20 | +#include <stdio.h> |
| 21 | + |
| 22 | +int main(int argc, char *argv[]) |
| 23 | +{ |
| 24 | + FILE *fdi, *fdo; |
| 25 | + unsigned short wi; |
| 26 | + unsigned short wo; |
| 27 | + int i; |
| 28 | + |
| 29 | + if(argc != 3) { |
| 30 | + fprintf(stderr, "Usage: byteswap <infile> <outfile>\n"); |
| 31 | + return 1; |
| 32 | + } |
| 33 | + fdi = fopen(argv[1], "rb"); |
| 34 | + if(!fdi) { |
| 35 | + perror("Unable to open input file"); |
| 36 | + return 1; |
| 37 | + } |
| 38 | + fdo = fopen(argv[2], "w"); |
| 39 | + if(!fdo) { |
| 40 | + perror("Unable to open output file"); |
| 41 | + fclose(fdi); |
| 42 | + return 1; |
| 43 | + } |
| 44 | + while(1) { |
| 45 | + if(fread(&wi, 2, 1, fdi) <= 0) break; |
| 46 | + wo = 0; |
| 47 | + for(i=0;i<16;i++) |
| 48 | + if(wi & (1 << i)) |
| 49 | + wo |= (0x8000 >> i); |
| 50 | + /* comment out the next line on big endian machines! */ |
| 51 | + wo = ((wo & 0x00ff) << 8) | ((wo & 0xff00) >> 8); |
| 52 | + fwrite(&wo, 2, 1, fdo); |
| 53 | + } |
| 54 | + fclose(fdi); |
| 55 | + if(fclose(fdo) != 0) { |
| 56 | + perror("Unable to close output file"); |
| 57 | + return 1; |
| 58 | + } |
| 59 | + return 0; |
| 60 | +} |
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