tools: add byteswap

diff --git a/.gitignore b/.gitignore
index 378e5117c3faba362a3b9f4f648bd4886f83fef0..04f48b42e62a50c7d5f1714235124979cf9e9955 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@ build/*
 tools/bin2hex
 tools/flterm
 tools/mkmmimg
+tools/byteswap

diff --git a/tools/Makefile b/tools/Makefile
index 134be463b5f583017a6442663f0531fd7e3d1cb2..582ed48ca2342aa86cfc822a5dbdcc66a27f59a6 100644 (file)
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -1,5 +1,5 @@
-TARGETS=mkmmimg flterm
-CC=clang
+TARGETS=mkmmimg flterm byteswap
+CC=gcc
 
 all: $(TARGETS)
 

diff --git a/tools/byteswap.c b/tools/byteswap.c
new file mode 100644 (file)
index 0000000..8d12b63
--- /dev/null
+++ b/tools/byteswap.c
@@ -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;
+}