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tools: add byteswap

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commit 3f22930b1fced27081d110ebf0d7f825ed4e07ae 1 parent 07120e3
@sbourdeauducq sbourdeauducq authored
Showing with 63 additions and 2 deletions.
  1. +1 −0  .gitignore
  2. +2 −2 tools/Makefile
  3. +60 −0 tools/byteswap.c
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1  .gitignore
@@ -8,3 +8,4 @@ build/*
tools/bin2hex
tools/flterm
tools/mkmmimg
+tools/byteswap
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4 tools/Makefile
@@ -1,5 +1,5 @@
-TARGETS=mkmmimg flterm
-CC=clang
+TARGETS=mkmmimg flterm byteswap
+CC=gcc
all: $(TARGETS)
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60 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;
+}
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