externalize hash code to library

src/hash.cpp

@@ -36,55 +36,9 @@
 
 #include "hash.h"
 
-uint32_t IRAM_ATTR rokkit(const char *data, int len) {
-  uint32_t hash, tmp;
-  int rem;
-
-  if (len <= 0 || data == 0)
-    return 0;
-  hash = len;
-  rem = len & 3;
-  len >>= 2;
-
-  /* Main loop */
-  while (len > 0) {
-    hash += *((uint16_t *)data);
-    tmp = (*((uint16_t *)(data + 2)) << 11) ^ hash;
-    hash = (hash << 16) ^ tmp;
-    data += 2 * 2;
-    hash += hash >> 11;
-    len--;
-  }
-
-  /* Handle end cases */
-  switch (rem) {
-  case 3:
-    hash += *((uint16_t *)data);
-    hash ^= hash << 16;
-    hash ^= ((uint32_t)data[2]) << 18;
-    hash += hash >> 11;
-    break;
-  case 2:
-    hash += *((uint16_t *)data);
-    hash ^= hash << 11;
-    hash += hash >> 17;
-    break;
-  case 1:
-    hash += (signed char)*data;
-    hash ^= hash << 10;
-    hash += hash >> 1;
-  }
-
-  /* Force "avalanching" of final 127 bits */
-  hash ^= hash << 3;
-  hash += hash >> 5;
-  hash ^= hash << 4;
-  hash += hash >> 17;
-  hash ^= hash << 25;
-  hash += hash >> 6;
-
-  return hash;
-}
+#ifdef ROKKIT_ENABLE_8BIT_OPTIMIZATIONS
+#undef ROKKIT_ENABLE_8BIT_OPTIMIZATIONS
+#endif
 
 uint32_t IRAM_ATTR hash(const char *data, int len) {
   return rokkit(data, len);