Add asset pack reader library

intern/pakrd/pak.h

@@ -0,0 +1,48 @@
+#ifndef PAK_H
+#define PAK_H
+
+#include "aliases.h"
+#include <stdbool.h>
+
+typedef struct {
+  u64 size;
+  u8 data[];
+} buf_t;
+
+typedef struct {
+  u64 offset;
+  u64 length;
+  char name[];
+} toc_entry_t;
+
+typedef struct {
+  u64 count;
+  u64 size;
+} toc_t;
+
+typedef struct {
+  u64 major;
+  u64 minor;
+  u64 patch;
+} pak_ver_t;
+
+typedef struct {
+  u64 size;
+  u8 data[];
+} pak_entry_t;
+
+typedef struct {
+  u64 magic;
+  pak_ver_t version;
+  toc_t toc;
+} pak_t;
+
+typedef struct asset_pack asset_pack_t;
+
+bool create_asset_pack(const char *dirpath, const char *output);
+asset_pack_t *load_asset_pack(const char *filepath);
+buf_t *read_file_from_pack(asset_pack_t *pack, const char *filename);
+void close_pack_file(buf_t **buf);
+void close_asset_pack(asset_pack_t **pack);
+
+#endif // !PAK_H