zlib: add gunzip() support
This commit adds some more files to use zlib from TF.
To use zlib, ->zalloc and ->zfree hooks are needed. The implementation
depends on the system. For user-space, the libc provides malloc() and
friends. Unfortunately, ARM Trusted Firmware does not provide malloc()
or any concept of dynamic memory allocation.
I implemented very simple calloc() and free() for this. Stupidly,
zfree() never frees memory, but it works enough for this.
The purpose of using zlib is to implement gunzip() - this function
takes compressed data from in_buf, then dumps the decompressed data
to oub_buf. The work_buf is used for memory allocation during the
decompress. Upon exit, it updates in_buf and out_buf. If successful,
in_buf points to the end of input data, out_buf to the end of the
decompressed data.
To use this feature, you need to do:
- include lib/zlib/zlib.mk from your platform.mk
- add $(ZLIB_SOURCES) to your BL*_SOURCES
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/lib/zlib/zlib.mk b/lib/zlib/zlib.mk
new file mode 100644
index 0000000..98d4efa
--- /dev/null
+++ b/lib/zlib/zlib.mk
@@ -0,0 +1,25 @@
+#
+# Copyright (c) 2018, ARM Limited and Contributors. All rights reserved.
+#
+# SPDX-License-Identifier: BSD-3-Clause
+#
+
+ZLIB_PATH := lib/zlib
+
+# Imported from zlib 1.2.11 (do not modify them)
+ZLIB_SOURCES := $(addprefix $(ZLIB_PATH)/, \
+ adler32.c \
+ crc32.c \
+ inffast.c \
+ inflate.c \
+ inftrees.c \
+ zutil.c)
+
+# Implemented for TF
+ZLIB_SOURCES += $(addprefix $(ZLIB_PATH)/, \
+ tf_gunzip.c)
+
+INCLUDES += -Iinclude/lib/zlib
+
+# REVISIT: the following flags need not be given globally
+TF_CFLAGS += -DZ_SOLO -DDEF_WBITS=31