added a new platformIO test project

test-pico-io/lib/Heavy/HvUtils.c

@@ -0,0 +1,54 @@
+/**
+ * Copyright (c) 2014-2018 Enzien Audio Ltd.
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
+ * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
+ * AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT,
+ * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
+ * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
+ * OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
+ * PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "HvUtils.h"
+
+hv_uint32_t hv_string_to_hash(const char *str) {
+  // this hash is based MurmurHash2
+  // http://en.wikipedia.org/wiki/MurmurHash
+  // https://sites.google.com/site/murmurhash/
+  static const hv_uint32_t n = 0x5bd1e995;
+  static const hv_int32_t r = 24;
+
+  if (str == NULL) return 0;
+
+  hv_uint32_t len = (hv_uint32_t) hv_strlen(str);
+  hv_uint32_t x = len; // seed (0) ^ len
+
+  while (len >= 4) {
+#if HV_EMSCRIPTEN
+    hv_uint32_t k = str[0] | (str[1] << 8) | (str[2] << 16) | (str[3] << 24);
+#else
+    hv_uint32_t k = *((hv_uint32_t *) str);
+#endif
+    k *= n;
+    k ^= (k >> r);
+    k *= n;
+    x *= n;
+    x ^= k;
+    str += 4; len -= 4;
+  }
+  switch (len) {
+    case 3: x ^= (str[2] << 16);
+    case 2: x ^= (str[1] << 8);
+    case 1: x ^= str[0]; x *= n;
+    default: break;
+  }
+  x ^= (x >> 13);
+  x *= n;
+  x ^= (x >> 15);
+  return x;
+}