From 9b629a1bcac12aad562864270818c778a1bef285 Mon Sep 17 00:00:00 2001
From: Sunil Nimmagadda <sunil@nimmagadda.net>
Date: Thu, 15 Oct 2026 21:58:04 +0530
Subject: Make it compact, just pack once.

---
 mkelf.lua | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/mkelf.lua b/mkelf.lua
index eb76d16..b6535d6 100644
--- a/mkelf.lua
+++ b/mkelf.lua
@@ -99,20 +99,24 @@ local function efmt(endian)
     return (endian == Endian.big) and ">" or "<"
 end
 
+local function szfmt(class)
+    return (class == Class.bit64) and "I8" or "I4"
+end
+
 ---@param hdr ElfHeader
 ---@nodiscard
 local function ElfHeader_pack(hdr)
-    local ident = string.pack("BBBBBBBBBxxxxxxx",
+    return string.pack("BBBBBBBBBxxxxxxx" ..
+        efmt(hdr.data) ..
+        "I2I2I4" ..
+        string.rep(szfmt(hdr.class), 3) ..
+        "I4I2I2I2I2I2I2",
         hdr.magic[1], hdr.magic[2], hdr.magic[3], hdr.magic[4],
         hdr.class,
         hdr.data,
         hdr.ident_version,
         hdr.osabi,
-        hdr.abiversion)
-    local sz = (hdr.class == Class.bit64) and "I8" or "I4"
-    local h = string.pack(efmt(hdr.data) .. "I2I2I4" ..
-        sz .. sz .. sz ..
-        "I4I2I2I2I2I2I2",
+        hdr.abiversion,
         hdr.type,
         hdr.machine,
         hdr.version,
@@ -126,7 +130,6 @@ local function ElfHeader_pack(hdr)
         hdr.shentsize,
         hdr.shnum,
         hdr.shstrndx)
-    return ident .. h
 end
 
 ---@type ElfHeader
-- 
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