From 20575ea1f389909926a49478439ad68eb772a011 Mon Sep 17 00:00:00 2001
From: Karol Kosek <krkk@serenityos.org>
Date: Fri, 17 Jun 2022 09:24:28 +0200
Subject: [PATCH] LibCompress: Add Zlib header structure

---
 Userland/Libraries/LibCompress/Zlib.h | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/Userland/Libraries/LibCompress/Zlib.h b/Userland/Libraries/LibCompress/Zlib.h
index f65457a640..195f962a7d 100644
--- a/Userland/Libraries/LibCompress/Zlib.h
+++ b/Userland/Libraries/LibCompress/Zlib.h
@@ -13,6 +13,32 @@
 
 namespace Compress {
 
+enum class ZlibCompressionMethod : u8 {
+    Deflate = 8,
+};
+
+enum class ZlibCompressionLevel : u8 {
+    Fastest,
+    Fast,
+    Default,
+    Best,
+};
+
+struct ZlibHeader {
+    union {
+        struct {
+            ZlibCompressionMethod compression_method : 4;
+            u8 compression_info : 4;
+
+            u8 check_bits : 5;
+            bool present_dictionary : 1;
+            ZlibCompressionLevel compression_level : 2;
+        };
+        NetworkOrdered<u16> as_u16;
+    };
+};
+static_assert(sizeof(ZlibHeader) == sizeof(u16));
+
 class Zlib {
 public:
     Optional<ByteBuffer> decompress();