Fixes #97: SQLite is now async, optimized, tests

plugos/sqlite/deno-sqlite/build/lib/pcg.c

@@ -0,0 +1,34 @@
+#include "pcg.h"
+
+// Random number generator.
+// Based on:
+// *Really* minimal PCG32 code / (c) 2014 M.E. O'Neill / pcg-random.org
+// Licensed under Apache License 2.0 (NO WARRANTY, etc. see website)
+
+uint64_t state = 0x853c49e6748fea9bULL;
+uint64_t inc   = 0xda3e39cb94b95bdbULL;
+
+// Update seed of generator.
+void pcg_seed(uint64_t seed) {
+  state = seed;
+}
+
+// Generate random integer.
+uint32_t pcg_rand() {
+    uint64_t oldstate = state;
+    // Advance internal state
+    state = oldstate * 6364136223846793005ULL + (inc|1);
+    // Calculate output function (XSH RR), uses old state for max ILP
+    uint32_t xorshifted = ((oldstate >> 18u) ^ oldstate) >> 27u;
+    uint32_t rot = oldstate >> 59u;
+    return (xorshifted >> rot) | (xorshifted << ((-rot) & 31));
+}
+
+// Fill out buffer with size random bytes.
+void pcg_bytes(char* out, int size) {
+  // TODO: We can be more efficient by using all 4
+  //       pieces of the random number returned.
+  for (int i = 0; i < size; i ++) {
+    out[i] = (char)pcg_rand();
+  }
+}