From a51ca085bff2f8c6155f18bb767fe2d053bbc90d Mon Sep 17 00:00:00 2001
From: Markus Stockhausen <markus.stockhausen@gmx.de>
Date: Tue, 26 Jul 2022 13:44:48 +0200
Subject: [PATCH] tools: Add gzip-libdeflate advanced compressor

Several devices provide U-Boot versions with only gzip compressed kernel
support (e.g. Realtek switches). This compression method produces larger
images than lzma. To save space on flash and avoid going the hard way with
lzma-loader we can make use of enhanced gzip tool based on libdeflate
compression library from https://github.com/ebiggers/libdeflate. It
keeps 100% deflate/gzip compatibility while improving compression ratio.
The image can be unpacked by the default inflate routines inside U-Boot.

Signed-off-by: Markus Stockhausen <markus.stockhausen@gmx.de>
[Switched to v1.15 and made it work with cmake]
Signed-off-by: Olliver Schinagl <oliver@schinagl.nl>
Reviewed-by: Robert Marko <robimarko@gmail.com>
Reviewed-by: Rosen Penev <rosenp@gmail.com>
Reviewed-by: Sander Vanheule <sander@svanheule.net>
---
 include/image-commands.mk |  5 +++++
 tools/Makefile            |  2 ++
 tools/libdeflate/Makefile | 31 +++++++++++++++++++++++++++++++
 3 files changed, 38 insertions(+)
 create mode 100644 tools/libdeflate/Makefile

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 074e40e4e8..15084093d2 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -306,6 +306,11 @@ define Build/fit
 	@mv $@.new $@
 endef
 
+define Build/libdeflate-gzip
+	$(STAGING_DIR_HOST)/bin/libdeflate-gzip -f -12 -c $@ $(1) > $@.new
+	@mv $@.new $@
+endef
+
 define Build/gzip
 	$(STAGING_DIR_HOST)/bin/gzip -f -9n -c $@ $(1) > $@.new
 	@mv $@.new $@
diff --git a/tools/Makefile b/tools/Makefile
index 6300180d3f..c7c7d00756 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -36,6 +36,7 @@ tools-y += findutils
 tools-y += firmware-utils
 tools-y += flex
 tools-y += gengetopt
+tools-y += libdeflate
 tools-y += libressl
 tools-y += libtool
 tools-y += lzma
@@ -88,6 +89,7 @@ $(curdir)/genext2fs/compile := $(curdir)/libtool/compile
 $(curdir)/gengetopt/compile := $(curdir)/libtool/compile
 $(curdir)/gmp/compile := $(curdir)/libtool/compile
 $(curdir)/isl/compile := $(curdir)/gmp/compile
+$(curdir)/libdeflate/compile := $(curdir)/cmake/compile
 $(curdir)/libressl/compile := $(curdir)/pkgconf/compile
 $(curdir)/libtool/compile := $(curdir)/automake/compile $(curdir)/missing-macros/compile
 $(curdir)/lzma-old/compile := $(curdir)/zlib/compile
diff --git a/tools/libdeflate/Makefile b/tools/libdeflate/Makefile
new file mode 100644
index 0000000000..d30a8ca674
--- /dev/null
+++ b/tools/libdeflate/Makefile
@@ -0,0 +1,31 @@
+#
+# Copyright (C) 2022 OpenWrt.org
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=libdeflate
+PKG_VERSION:=1.15
+PKG_RELEASE:=1
+
+PKG_SOURCE_URL:=https://github.com/ebiggers/libdeflate.git
+PKG_SOURCE_PROTO:=git
+PKG_SOURCE_VERSION:=v$(PKG_VERSION)
+PKG_MIRROR_HASH:=122feff4543541b547dc89e832adf262c81911ae1acbccdc591f0353a85b600a
+
+include $(INCLUDE_DIR)/host-build.mk
+include $(INCLUDE_DIR)/cmake.mk
+
+define Host/Install
+	$(INSTALL_BIN) $(HOST_BUILD_DIR)/programs/libdeflate-gzip $(STAGING_DIR_HOST)/bin/
+	$(LN) libdeflate-gzip $(STAGING_DIR_HOST)/bin/libdeflate-gunzip
+endef
+
+define Host/Clean
+	rm -f $(STAGING_DIR_HOST)/bin/libdeflate-gzip
+	rm -f $(STAGING_DIR_HOST)/bin/libdeflate-gunzip
+endef
+
+$(eval $(call HostBuild))
-- 
2.30.2