diff --git a/README.md b/README.md
index 98418ed..57bef21 100644
--- a/README.md
+++ b/README.md
@@ -357,11 +357,11 @@ bdz_gid               ?                bdz(gid)
 bdz_groupname         ?                bdz(groupname)
 bdz_uid               ?                bdz(uid)
 bdz_username          ?                bdz(username)
-idx_gid2group         len(group)*29/8  bdz->offset Groups
-idx_groupname2group   len(group)*29/8  bdz->offset Groups
-idx_uid2user          len(user)*29/8   bdz->offset Users
-idx_name2user         len(user)*29/8   bdz->offset Users
-idx_username2gids     len(user)*29/8   bdz->offset UserGids
+idx_gid2group         len(group)*4     bdz->offset Groups
+idx_groupname2group   len(group)*4     bdz->offset Groups
+idx_uid2user          len(user)*4      bdz->offset Users
+idx_name2user         len(user)*4      bdz->offset Users
+idx_username2gids     len(user)*4      bdz->offset UserGids
 shellIndex            len(shells)*2    shell index array
 shellBlob             <= 4032          shell data blob (max 63*64 bytes)
 groups                ?                packed Group entries (8b padding)
diff --git a/src/sections.zig b/src/sections.zig
index 42944db..bd07010 100644
--- a/src/sections.zig
+++ b/src/sections.zig
@@ -22,6 +22,7 @@ const bdz = @import("bdz.zig");
 const User = userImport.User;
 const Group = groupImport.Group;
 const ShellSections = shellImport.ShellWriter.ShellSections;
+const ShellReader = shellImport.ShellReader;
 
 const Corpus = struct {
     arena: std.heap.ArenaAllocator,
@@ -391,8 +392,7 @@ pub const AllSections = struct {
     bdz_username: []const u8,
     users: UsersSection,
     shell_sections: ShellSections,
-    shell_index: []const u8,
-    shell_blob: []const u8,
+    shell_reader: ShellReader,
     user_gids: UserGids,
     group_members: GroupMembers,
     groups: GroupsSection,
@@ -406,8 +406,6 @@ pub const AllSections = struct {
         const bdz_uid = try bdzUid(allocator, corpus);
         const bdz_username = try bdzUsername(allocator, corpus);
         const shell_sections = try shellSections(allocator, corpus);
-        const shell_index = shell_sections.index;
-        const shell_blob = shell_sections.blob;
         const user_gids = try userGids(allocator, corpus);
         const users = try usersSection(
             allocator,
@@ -425,6 +423,11 @@ pub const AllSections = struct {
             corpus,
             group_members.idx2offset,
         );
+        const shell_reader = shellImport.ShellReader.init(
+            mem.sliceAsBytes(shell_sections.index.constSlice()),
+            mem.sliceAsBytes(shell_sections.blob.constSlice()),
+        );
+
         return AllSections{
             .allocator = allocator,
             .bdz_gid = bdz_gid,
@@ -432,8 +435,7 @@ pub const AllSections = struct {
             .bdz_uid = bdz_uid,
             .bdz_username = bdz_username,
             .shell_sections = shell_sections,
-            .shell_index = mem.sliceAsBytes(shell_index.constSlice()),
-            .shell_blob = mem.sliceAsBytes(shell_blob.constSlice()),
+            .shell_reader = shell_reader,
             .user_gids = user_gids,
             .users = users,
             .group_members = group_members,
@@ -583,8 +585,11 @@ test "test groups and group members" {
         try testing.expectEqual(it.next(), null);
     }
 
-    //var it = userImport.PackedUserHash.iterator(sections.groups.blob);
-    //_ = it;
+    var it = userImport.PackedUser.iterator(
+        sections.users.blob,
+        sections.shell_reader,
+    );
+    _ = it;
 }
 
 test "userGids" {