Added Virtual File System support

vfs.h

@@ -0,0 +1,36 @@
+#pragma once
+
+#include "str.h"
+#include "arena.h"
+
+typedef enum {
+    VFS_FLAGS_NONE                 = 0,
+    VFS_FLAGS_COMPRESSED           = 1 << 0,
+    VFS_FLAGS_NULL_TERMINATE_FILES = 1 << 1, // only valid when compress is false
+    VFS_FLAGS_DONT_STREAM          = 1 << 2, 
+} vfsflags_e;
+
+typedef struct virtualfs_t virtualfs_t;
+
+bool vfsVirtualiseDir(arena_t scratch, strview_t dirpath, strview_t outfile, vfsflags_e flags);
+virtualfs_t *vfsReadFromFile(arena_t *arena, strview_t vfs_file, vfsflags_e flags);
+buffer_t vfsRead(arena_t *arena, virtualfs_t *vfs, strview_t path);
+str_t vfsReadStr(arena_t *arena, virtualfs_t *vfs, strview_t path);
+
+// vfs replacement for the file api
+
+typedef struct {
+    uintptr_t handle;
+} vfs_file_t;
+
+void vfsSetGlobalVirtualFS(virtualfs_t *vfs);
+
+bool vfsFileExists(strview_t path);
+vfs_file_t vfsFileOpen(strview_t name, int mode);
+void vfsFileClose(vfs_file_t ctx);
+bool vfsFileIsValid(vfs_file_t ctx);
+usize vfsFileSize(vfs_file_t ctx);
+buffer_t vfsFileReadWhole(arena_t *arena, strview_t name);
+buffer_t vfsFileReadWholeFP(arena_t *arena, vfs_file_t ctx);
+str_t vfsFileReadWholeStr(arena_t *arena, strview_t name);
+str_t vfsFileReadWholeStrFP(arena_t *arena, vfs_file_t ctx);