add file hashing for cache validation and provide the license to the cc0 files in the project

src/main.c

@@ -6,6 +6,9 @@
 #include "runtime/runtime.h"
 #include "translator/translator.h"
 
+#include "external/xxhash/xxhash.h"
+#include "hash_data/hash_data.h"
+#include <arpa/inet.h>
 #include <endian.h>
 #include <locale.h>
 #include <stdbool.h>
@@ -15,15 +18,30 @@
 #include <string.h>
 #include <time.h>
 #include <unistd.h>
-#include "hash_data/hash_data.h"
 
 const char FILE_IDENTIFIER[] = "ARBI";
 const uint32_t version_number = 0;
 
+uint64_t htonll(uint64_t x) {
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+  return ((uint64_t)htonl(x & 0xFFFFFFFF) << 32) | htonl(x >> 32);
+#else
+  return x;
+#endif
+}
+
+uint64_t ntohll(uint64_t x) {
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+  return ((uint64_t)ntohl(x & 0xFFFFFFFF) << 32) | ntohl(x >> 32);
+#else
+  return x;
+#endif
+}
+
 int main(int argc, char *argv[]) {
   generate_siphash_key(siphash_key);
   clock_t start, end;
-  double time_spent, total_time_spent=0;
+  double time_spent, total_time_spent = 0;
   setlocale(LC_ALL, "");
   if (argc <= 1)
     return -1;
@@ -34,17 +52,29 @@ int main(int argc, char *argv[]) {
   darray_init(&tokens, sizeof(Token));
 
   FILE *file = fopen(path, "r");
-
   if (!file) {
     return -1;
   }
 
+  XXH3_state_t *hash_state = XXH3_createState();
+  XXH3_64bits_reset(hash_state);
+
+  char buffer[8192];
+  size_t bytes;
+  while ((bytes = fread(buffer, 1, sizeof(buffer), file)) > 0) {
+    XXH3_64bits_update(hash_state, buffer, bytes);
+  }
+  rewind(file);
+  uint64_t hash = XXH3_64bits_digest(hash_state);
+  XXH3_freeState(hash_state);
+  printf("Hash: %016llx\n", (unsigned long long)hash);
+
   LexerState state = {path, file, 0, 0, &tokens};
   start = clock();
   lexer(state);
   end = clock();
   time_spent = (double)(end - start) / CLOCKS_PER_SEC;
-  total_time_spent+=time_spent;
+  total_time_spent += time_spent;
   printf("Lexer time taken: %f seconds\n", time_spent);
   fclose(state.file);
 
@@ -56,7 +86,7 @@ int main(int argc, char *argv[]) {
   parser(path, &ast, &tokens, false);
   end = clock();
   time_spent = (double)(end - start) / CLOCKS_PER_SEC;
-  total_time_spent+=time_spent;
+  total_time_spent += time_spent;
   printf("Parser time taken: %f seconds\n", time_spent);
   darray_free(&tokens, free_token);
 
@@ -66,7 +96,7 @@ int main(int argc, char *argv[]) {
   translate(&translated, &ast);
   end = clock();
   time_spent = (double)(end - start) / CLOCKS_PER_SEC;
-  total_time_spent+=time_spent;
+  total_time_spent += time_spent;
   printf("Translation time taken: %f seconds\n", time_spent);
 
   darray_free(&ast, free_parsed);
@@ -77,10 +107,12 @@ int main(int argc, char *argv[]) {
   uint64_t bytecodeSize = (uint64_t)translated.bytecode.size;
 
   uint32_t version_number_htole32ed = htole32(version_number);
+  uint64_t net_hash = htonll(hash);
   constantsSize = htole64(constantsSize);
   bytecodeSize = htole64(bytecodeSize);
 
   fwrite(&FILE_IDENTIFIER, sizeof(char), strlen(FILE_IDENTIFIER), file);
+  fwrite(&net_hash, sizeof(net_hash), 1, file);
   fwrite(&version_number_htole32ed, sizeof(uint32_t), 1, file);
   fwrite(&translated.registerCount, sizeof(uint8_t), 1, file);
   fwrite(&constantsSize, sizeof(uint64_t), 1, file);
@@ -98,7 +130,7 @@ int main(int argc, char *argv[]) {
 
   end = clock();
   time_spent = (double)(end - start) / CLOCKS_PER_SEC;
-  total_time_spent+=time_spent;
+  total_time_spent += time_spent;
   printf("Execution time taken: %f seconds\n", time_spent);
   printf("total time taken: %f seconds\n", total_time_spent);