From a5b07cdf9c491fb7a4a16598c482c68b718f59b9 Mon Sep 17 00:00:00 2001
From: Martin Liska <mliska@suse.cz>
Date: Tue, 29 Nov 2022 10:59:30 +0100
Subject: support ZSTD compression algorithm

config/ChangeLog:

	* libelf.pc.in: Add LIBLZSTD to Requires.private.

ChangeLog:

	* configure.ac: Detect ZSTD streaming API.

libelf/ChangeLog:

	* Makefile.am: Use zstd_LIBS.
	* elf_compress.c:
	(__libelf_compress): Split into ...
	(__libelf_compress_zlib): ... this.
	(do_zstd_cleanup): New.
	(zstd_cleanup): New.
	(__libelf_compress_zstd): New.
	(__libelf_decompress): Switch in between zlib and zstd.
	(__libelf_decompress_zlib): Renamed from __libelf_decompress.
	(__libelf_decompress_zstd): New.
	(__libelf_decompress_elf): Dispatch in between compression
	algorithms.
	(elf_compress): Likewise.
	* elf_compress_gnu.c (elf_compress_gnu): Call with
	ELFCOMPRESS_ZLIB.
	* libelfP.h (__libelf_compress): Add new argument.
	(__libelf_decompress): Add chtype argument.

src/ChangeLog:

	* elfcompress.c (enum ch_type): Add ZSTD.
	(parse_opt): Parse "zstd".
	(get_section_chtype): New.
	(process_file): Support zstd compression.
	(main): Add zstd to help.
	* readelf.c (elf_ch_type_name): Rewrite with switch.

tests/ChangeLog:

	* Makefile.am: Add ELFUTILS_ZSTD if zstd is enabled.
	* run-compress-test.sh: Test zstd compression algorithm
	for debug sections.
---
 configure.ac | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'configure.ac')

diff --git a/configure.ac b/configure.ac
index 59be27ac..b2597f8b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -420,10 +420,22 @@ AC_SUBST([LIBLZMA])
 eu_ZIPLIB(zstd,ZSTD,zstd,ZSTD_decompress,[ZSTD (zst)])
 AS_IF([test "x$with_zstd" = xyes], [LIBZSTD="libzstd"], [LIBLZSTD=""])
 AC_SUBST([LIBZSTD])
+zstd_LIBS="$LIBS"
+AC_SUBST([zstd_LIBS])
 zip_LIBS="$LIBS"
 LIBS="$save_LIBS"
 AC_SUBST([zip_LIBS])
 
+dnl zstd compression support requires libzstd 1.4.0+
+AS_IF([test "x$with_zstd" = xyes], [
+      PKG_PROG_PKG_CONFIG
+      PKG_CHECK_MODULES([ZSTD_COMPRESS],[libzstd >= 1.4.0],
+                        [with_zstd_compress="yes"],[with_zstd_compress="no"])],
+      [with_zstd_compress="no"])
+AM_CONDITIONAL(USE_ZSTD_COMPRESS, test "x$with_zstd_compress" = "xyes")
+AS_IF([test "x$with_zstd_compress" = "xyes"],
+      [AC_DEFINE([USE_ZSTD_COMPRESS], [1], [zstd compression support])])
+
 AC_CHECK_DECLS([memrchr, rawmemchr],[],[],
                [#define _GNU_SOURCE
                 #include <string.h>])
@@ -829,6 +841,7 @@ AC_MSG_NOTICE([
     bzip2 support                      : ${with_bzlib}
     lzma/xz support                    : ${with_lzma}
     zstd support                       : ${with_zstd}
+    zstd compression support           : ${with_zstd_compress}
     libstdc++ demangle support         : ${enable_demangler}
     File textrel check                 : ${enable_textrelcheck}
     Symbol versioning                  : ${enable_symbol_versioning}
-- 
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