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tools: add byteswap
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Sebastien Bourdeauducq committed Feb 19, 2013
1 parent 07120e3 commit 3f22930b1fced27081d110ebf0d7f825ed4e07ae
Showing with 63 additions and 2 deletions.
  1. +1 −0 .gitignore
  2. +2 −2 tools/Makefile
  3. +60 −0 tools/byteswap.c
@@ -8,3 +8,4 @@ build/*
tools/bin2hex
tools/flterm
tools/mkmmimg
tools/byteswap
@@ -1,5 +1,5 @@
TARGETS=mkmmimg flterm
CC=clang
TARGETS=mkmmimg flterm byteswap
CC=gcc

all: $(TARGETS)

@@ -0,0 +1,60 @@
/*
* 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;
}

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