Messages in this thread Patch in this message | | | From | Arnaldo Carvalho de Melo <> | Subject | [PATCH 16/21] perf tools: Add gzip_is_compressed function | Date | Mon, 20 Aug 2018 13:15:57 -0300 |
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From: Jiri Olsa <jolsa@kernel.org>
Add implementation of the is_compressed callback for gzip.
Signed-off-by: Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20180817094813.15086-13-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@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 @@ int gzip_decompress_to_file(const char *input, int output_fd) 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; } -- 2.14.4
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