Commit-ID: 4b57fd44b61beb51b7d64f21c72941ba10c1ea2b Gitweb: https://git.kernel.org/tip/4b57fd44b61beb51b7d64f21c72941ba10c1ea2b Author: Jiri Olsa <jo...@kernel.org> AuthorDate: Fri, 17 Aug 2018 11:48:11 +0200 Committer: Arnaldo Carvalho de Melo <a...@redhat.com> CommitDate: Mon, 20 Aug 2018 08:54:59 -0300
perf tools: Add lzma_is_compressed function Add implementation of the is_compressed callback for lzma. 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/20180817094813.15086-12-jo...@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <a...@redhat.com> --- tools/perf/util/lzma.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/tools/perf/util/lzma.c b/tools/perf/util/lzma.c index 7032caaf75eb..b1dd29a9d915 100644 --- a/tools/perf/util/lzma.c +++ b/tools/perf/util/lzma.c @@ -3,9 +3,13 @@ #include <lzma.h> #include <stdio.h> #include <linux/compiler.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> #include "compress.h" #include "util.h" #include "debug.h" +#include <unistd.h> #define BUFSIZE 8192 @@ -100,7 +104,18 @@ err_fclose: return err; } -bool lzma_is_compressed(const char *input __maybe_unused) +bool lzma_is_compressed(const char *input) { - return true; + int fd = open(input, O_RDONLY); + const uint8_t magic[6] = { 0xFD, '7', 'z', 'X', 'Z', 0x00 }; + char buf[6] = { 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; }
