1 files changed, 43 insertions, 0 deletions
diff --git a/src/include/engine/engine.h b/src/include/engine/engine.h
new file mode 100644
index 0000000..d233bdd
--- /dev/null
+++ b/src/include/engine/engine.h
@@ -0,0 +1,43 @@
+#ifndef ENGINE_H
+#define ENGINE_H
+
+#define TABLEN 1024
+
+typedef struct {
+  char *key;
+  int flag;
+  union {
+    char *str;
+    double num;
+    unsigned int boolean : 1;
+  } value;
+} tabidx_t;
+
+typedef struct {
+  int len;
+  tabidx_t tab[TABLEN];
+} tablist_t;
+
+/* getkeys: gets the provided keys from the provided id,
+ * if the id is set to -1, it will get the provided key from every document,
+ * if keys is NULL, it will get every key. */
+tablist_t *getkeys(tablist_t *list, int id, char **keys, int len);
+
+/* setkeys: sets the provided key-value pairs in the provided object,
+ * if the id is -1, it will set the provided pairs in every object. */
+int setkeys(tablist_t **list, int id, char **pairs, int len);
+
+/* delkeys: deletes the provided keys from the provided id,
+ * if the id is -1, it will delete the provided key from every document,
+ * if keys is NULL it, will delete every key. */
+int delkeys(tablist_t *list, int id, char **keys, int len);
+
+/* readdb: reads the provided db file,
+ * if the filename is NULL, it will return an empty table list,
+ * if the file format is invalid, it will return NULL. */
+tablist_t *readdb(char *filename);
+
+/* writedb: writes a table list to a database file. */
+void writedb(char *filename, tablist_t *list);
+
+#endif