1 files changed, 46 insertions, 0 deletions
diff --git a/lib/hexify.c b/lib/hexify.c
new file mode 100644
index 0000000..e3941b2
--- /dev/null
+++ b/lib/hexify.c
@@ -0,0 +1,46 @@
+/* hexify.c: change a binary string to ASCII hex characters.
+
+Copyright (C) 1992 Free Software Foundation, Inc.
+
+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; either version 2, or (at your option)
+any later version.
+
+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, write to the Free Software
+Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include "config.h"
+
+#include "hexify.h"
+
+
+/* Convert the number N (assumed to be small enough) to a lowercase hex
+   character.  */
+#define HEX_DIGIT(n) ((n) < 10 ? (n) + '0' : (n) - 10 + 'a')
+
+string
+hexify (one_byte *data, unsigned length)
+{
+  unsigned i;
+  /* Each byte in S turns into two hex chars, plus the terminating null.  */
+  string h = xmalloc (length * 2 + 1);
+  
+  for (i = 0; i < length; i++)
+    {
+      unsigned char n = (data[i] & 0xf0) >> 4;
+      h[i * 2] = HEX_DIGIT (n);
+
+      n = data[i] & 0x0f;
+      h[i * 2 + 1] = HEX_DIGIT (n);
+    }
+  h[i * 2] = 0;
+  
+  return h;
+}