--- nstx_encode.c.orig
+++ nstx_encode.c
@@ -30,11 +30,11 @@
 
 void init_revmap (void)
 {
-   int i;
+   unsigned int i;
    
    revmap = malloc(256);
    
-   for (i = 0; i < strlen(map); i++)
+   for (i = 0; i < strlen((char*)map); i++)
      revmap[map[i]] = i;
 }
    
@@ -70,11 +70,11 @@
    if (!revmap)
      init_revmap();
    
-   len = strlen(data)-1;
-   
+   len = strlen((char*)data);
+
    buf = realloc(buf, ((len+3)/4)*3);
    
-   while (off < len) {
+   while (off+3 < len) {
       buf[i+0] = (revmap[data[off]]<<2)|((revmap[data[off+1]]&48)>>4);
       buf[i+1] = ((revmap[data[off+1]]&15)<<4)|((revmap[data[off+2]]&60)>>2);
       buf[i+2] = ((revmap[data[off+2]]&3)<<6)|(revmap[data[off+3]]);