fix some simple bugs, mostly to placate valgrind

0429559b · Nickolai Zeldovich · 03186c62 · 0429559b
--- a/include/arc4.hh
+++ b/include/arc4.hh
@@ -3,7 +3,7 @@ class arc4 {
  arc4(const u8 *key, size_t nbytes) {
    reset();
    for (size_t n = 0; n < nbytes; n += 128)
-      addkey(&key[n], nbytes > n + 128 ? 128 : n + 128 - nbytes);
+      addkey(&key[n], nbytes - n > 128 ? 128 : nbytes - n);
    j = i;
  }
@@ -21,7 +21,7 @@ class arc4 {
  template<class T> T rand() {
    T v;
    for (u32 i = 0; i < sizeof(v); i++)
-      *(u8*) &v = getbyte();
+      i[(u8*) &v] = getbyte();
    return v;
  }