use hashmap in constants buffer to speed up translation time with large files

src/hash_data/hash_data.c

@@ -0,0 +1,28 @@
+#include <fcntl.h>
+#include <stdint.h>
+#include <unistd.h>
+#include "siphash/siphash.h"
+#include "hash_data.h"
+
+uint8_t siphash_key[16];
+uint8_t empty_siphash_key[16];
+
+void generate_siphash_key(uint8_t hash_key[16]) {
+  int fd = open("/dev/urandom", O_RDONLY);
+  if (fd < 0 || read(fd, hash_key, 16) != 16) {
+    // Fallback or abort
+  }
+  close(fd);
+}
+
+uint64_t siphash64_bytes(const void *data, size_t len,uint8_t hash_key[16]) {
+  uint8_t out[8];
+  if (siphash(data, len, hash_key, out, sizeof(out)) != 0)
+    return 0;
+
+  uint64_t hash = 0;
+  for (int i = 0; i < 8; ++i)
+    hash |= ((uint64_t)out[i]) << (8 * i);
+
+  return hash;
+}