From 4b57fd44b61beb51b7d64f21c72941ba10c1ea2b Mon Sep 17 00:00:00 2001 From: Jiri Olsa Date: Fri, 17 Aug 2018 11:48:11 +0200 Subject: perf tools: Add lzma_is_compressed function Add implementation of the is_compressed callback for lzma. Signed-off-by: Jiri Olsa Cc: Alexander Shishkin Cc: David Ahern Cc: Michael Petlan Cc: Namhyung Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20180817094813.15086-12-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/lzma.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) (limited to 'tools') 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 #include #include +#include +#include +#include #include "compress.h" #include "util.h" #include "debug.h" +#include #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; } -- cgit v1.2.3