implemented database functions

src/db/idb.h

@@ -0,0 +1,50 @@
+#pragma once
+
+#include "tlibc/errors.h"
+#include "tlibc/string/str.h"
+#include "tlibc/collections/Array.h"
+#include "tlibc/collections/HashMap.h"
+
+typedef struct IncrementalDB IncrementalDB;
+
+typedef union Magic32 {
+    u32 n;
+    u8 bytes[4];
+} Magic32;
+
+typedef struct TableHeader {
+    Magic32 magic;
+    u16 version;
+    bool _dirty_bit;
+    u32 row_size;
+} __attribute__((aligned(256))) TableHeader;
+
+typedef struct Table {
+    TableHeader header;
+    IncrementalDB* db;
+    str name;
+    str table_file_path;
+    str changes_file_path;
+    FILE* table_file;
+    FILE* changes_file;
+    u64 row_count;
+} Table;
+
+typedef struct IncrementalDB {
+    str db_dir;
+    HashMap(Table**) tables_map;
+} IncrementalDB;
+
+Result(IncrementalDB*) idb_open(str db_dir);
+void idb_close(IncrementalDB* db);
+
+Result(Table*) idb_getOrCreateTable(IncrementalDB* db, str _table_name, u32 row_size);
+
+Result(void) idb_getRows(Table* t, u64 id, void* dst, u64 count);
+#define idb_getRow(T, ID, DST) idb_getRows(T, ID, DST, 1)
+
+Result(u64) idb_pushRows(Table* t, const void* src, u64 count);
+#define idb_pushRow(T, SRC) idb_pushRows(T, SRC, 1)
+
+Result(void) idb_updateRows(Table* t, u64 id, const void* src, u64 count);
+#define idb_updateRow(T, ID, SRC) idb_updateRows(T, ID, SRC, 1)