pkg: add support for lz4 fast compression library

pkg/Kconfig

@@ -29,6 +29,7 @@ rsource "libfixmath/Kconfig"
 rsource "libhydrogen/Kconfig"
 rsource "lora-serialization/Kconfig"
 rsource "lvgl/Kconfig"
+rsource "lz4/Kconfig"
 rsource "micro-ecc/Kconfig"
 rsource "microcoap/Kconfig"
 rsource "minmea/Kconfig"

pkg/lz4/Kconfig

@@ -0,0 +1,9 @@
+# Copyright (c) 2021 Inria
+#
+# This file is subject to the terms and conditions of the GNU Lesser
+# General Public License v2.1. See the file LICENSE in the top level
+# directory for more details.
+
+config PACKAGE_LZ4
+    bool "LZ4 fast compression library"
+    depends on TEST_KCONFIG

pkg/lz4/Makefile

@@ -0,0 +1,9 @@
+PKG_NAME=lz4
+PKG_URL=https://github.com/lz4/lz4
+PKG_VERSION=d44371841a2f1728a3f36839fd4b7e872d0927d3  # v1.9.3
+PKG_LICENSE=BSD
+
+include $(RIOTBASE)/pkg/pkg.mk
+
+all:
+	$(QQ)"$(MAKE)" -f $(CURDIR)/$(PKG_NAME).mk -C $(PKG_SOURCE_DIR)/lib

pkg/lz4/Makefile.dep

@@ -0,0 +1,2 @@
+# lz4 cannot be built on 8bit and 16bit architectures
+FEATURES_BLACKLIST += arch_8bit arch_16bit

pkg/lz4/Makefile.include

@@ -0,0 +1 @@
+INCLUDES += -I$(PKGDIRBASE)/lz4/lib

pkg/lz4/doc.txt

@@ -0,0 +1,19 @@
+/**
+ * @defgroup pkg_lz4   LZ4 compression library
+ * @ingroup  pkg
+ * @brief    LZ4 is a fast compression library
+ *
+ * # Note about memory
+ *
+ * By default, the LZ4 implementation allocates memory on the stack. This
+ * way compression/decompression functions are fast but this comes at the cost
+ * of RAM usage.
+ * It is important to allocated enough stack memory (at least 16384 bytes) to
+ * any thread using LZ4 primitives.
+ *
+ * # License
+ *
+ * Licensed under BSD 2-clause.
+ *
+ * @see      https://github.com/lz4/lz4
+ */

pkg/lz4/lz4.mk

@@ -0,0 +1,8 @@
+MODULE = lz4
+
+SRC := \
+    lz4.c \
+    lz4hc.c \
+	#
+
+include $(RIOTBASE)/Makefile.base