linux-kernel - [tip:perf/urgent] perf tools: Add lzma_is

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Message-ID: <tip-4b57fd44b61beb51b7d64f21c72941ba10c1ea2b@git.kernel.org>
Date:   Thu, 23 Aug 2018 01:44:24 -0700
From:   tip-bot for Jiri Olsa <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     mpetlan@...hat.com, peterz@...radead.org, acme@...hat.com,
        dsahern@...il.com, tglx@...utronix.de, jolsa@...nel.org,
        namhyung@...nel.org, linux-kernel@...r.kernel.org,
        alexander.shishkin@...ux.intel.com, hpa@...or.com, mingo@...nel.org
Subject: [tip:perf/urgent] perf tools: Add lzma_is_compressed function

Commit-ID:  4b57fd44b61beb51b7d64f21c72941ba10c1ea2b
Gitweb:     https://git.kernel.org/tip/4b57fd44b61beb51b7d64f21c72941ba10c1ea2b
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Fri, 17 Aug 2018 11:48:11 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.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 <jolsa@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Michael Petlan <mpetlan@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/20180817094813.15086-12-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.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;
 }