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.

2 files changed, 32 insertions, 0 deletions

diff --git a/tests/Makefile.am b/tests/Makefile.am
index c35a7c33..71b19601 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -220,6 +220,10 @@ if HAVE_ZSTD
 TESTS += run-readelf-compressed-zstd.sh
 endif
 
+if USE_ZSTD_COMPRESS
+export ELFUTILS_ZSTD = 1
+endif
+
 if DEBUGINFOD
 check_PROGRAMS += debuginfod_build_id_find
 # With the dummy delegation doesn't work
diff --git a/tests/run-compress-test.sh b/tests/run-compress-test.sh
index a6a298f5..2d4eebd6 100755
--- a/tests/run-compress-test.sh
+++ b/tests/run-compress-test.sh
@@ -61,6 +61,34 @@ testrun_elfcompress_file()
     echo "uncompress $elfcompressedfile -> $elfuncompressedfile"
     testrun ${abs_top_builddir}/src/elfcompress -v -t none -o ${elfuncompressedfile} ${elfcompressedfile}
     testrun ${abs_top_builddir}/src/elfcmp ${uncompressedfile} ${elfuncompressedfile}
+
+    if test -z "$ELFUTILS_ZSTD"; then
+      return;
+    fi
+
+    outputfile="${infile}.gabi.zstd"
+    tempfiles "$outputfile"
+    echo "zstd compress $elfcompressedfile -> $outputfile"
+    testrun ${abs_top_builddir}/src/elfcompress -v -t zstd -o ${outputfile} ${elfcompressedfile}
+    testrun ${abs_top_builddir}/src/elfcmp ${uncompressedfile} ${outputfile}
+    echo "checking compressed section header" $outputfile
+    testrun ${abs_top_builddir}/src/readelf -Sz ${outputfile} | grep "ELF ZSTD" >/dev/null
+
+    zstdfile="${infile}.zstd"
+    tempfiles "$zstdfile"
+    echo "zstd compress $uncompressedfile -> $zstdfile"
+    testrun ${abs_top_builddir}/src/elfcompress -v -t zstd -o ${zstdfile} ${elfuncompressedfile}
+    testrun ${abs_top_builddir}/src/elfcmp ${uncompressedfile} ${zstdfile}
+    echo "checking compressed section header" $zstdfile
+    testrun ${abs_top_builddir}/src/readelf -Sz ${zstdfile} | grep "ELF ZSTD" >/dev/null
+
+    zstdgnufile="${infile}.zstd.gnu"
+    tempfiles "$zstdgnufile"
+    echo "zstd re-compress to GNU ZLIB $zstdfile -> $zstdgnufile"
+    testrun ${abs_top_builddir}/src/elfcompress -v -t zlib-gnu -o ${zstdgnufile} ${zstdfile}
+    testrun ${abs_top_builddir}/src/elfcmp ${uncompressedfile} ${zstdgnufile}
+    echo "checking .zdebug section name" $zstdgnufile
+    testrun ${abs_top_builddir}/src/readelf -S ${zstdgnufile} | grep ".zdebug" >/dev/null
 }
 
 testrun_elfcompress()