Commit-ID: 88c74dc76a30b9242c2df687deb44788d93fee6b Gitweb: https://git.kernel.org/tip/88c74dc76a30b9242c2df687deb44788d93fee6b Author: Jiri Olsa <jo...@kernel.org> AuthorDate: Fri, 17 Aug 2018 11:48:12 +0200 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Mon, 20 Aug 2018 08:54:59 -0300
perf tools: Add gzip_is_compressed function Add implementation of the is_compressed callback for gzip. Signed-off-by: Jiri Olsa <jo...@kernel.org> Cc: Alexander Shishkin <alexander.shish...@linux.intel.com> Cc: David Ahern <dsah...@gmail.com> Cc: Michael Petlan <mpet...@redhat.com> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Peter Zijlstra <pet...@infradead.org> Link: http://lkml.kernel.org/r/20180817094813.15086-13-jo...@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/perf/util/zlib.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/zlib.c b/tools/perf/util/zlib.c index e68317214679..902ce6384f57 100644 --- a/tools/perf/util/zlib.c +++ b/tools/perf/util/zlib.c @@ -6,6 +6,7 @@ #include <sys/mman.h> #include <zlib.h> #include <linux/compiler.h> +#include <unistd.h> #include "util/compress.h" #include "util/util.h" @@ -81,7 +82,18 @@ out_close: return ret == Z_STREAM_END ? 0 : -1; } -bool gzip_is_compressed(const char *input __maybe_unused) +bool gzip_is_compressed(const char *input) { - return true; + int fd = open(input, O_RDONLY); + const uint8_t magic[2] = { 0x1f, 0x8b }; + char buf[2] = { 0 }; + ssize_t rc; + + if (fd < 0) + return -1; + + rc = read(fd, buf, sizeof(buf)); + close(fd); + return rc == sizeof(buf) ? + memcmp(buf, magic, sizeof(buf)) == 0 : false; }
