[PATCH v5 6/8] perf header: Add is_perf_magic() func

Feng Tang
2012-10-29T03:57:41Z

With this function, other modules can basically check whether a
file is a legal perf data file by checking its first 8 bytes
against all possible perf magic numbers.

Change the function name from check_perf_magic to more meaningful
is_perf_magic as suggested by acme.

Signed-off-by: Feng Tang <feng.tang@intel.com>
---
tools/perf/util/header.c | 10 ++++++++++
tools/perf/util/header.h | 1 +
2 files changed, 11 insertions(+)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 7daad23..87e679e 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2340,6 +2340,16 @@ static int try_all_pipe_abis(uint64_t hdr_sz, struct perf_header *ph)
return -1;
}

+bool is_perf_magic(u64 magic)
+{
+ if (!memcmp(&magic, __perf_magic1, sizeof(magic))
+ || magic == __perf_magic2
+ || magic == __perf_magic2_sw)
+ return true;
+
+ return false;
+}
+
static int check_magic_endian(u64 magic, uint64_t hdr_sz,
bool is_pipe, struct perf_header *ph)
{
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 879d215..5f1cd68 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -154,6 +154,7 @@ int perf_event__synthesize_build_id(struct perf_tool *tool,
int perf_event__process_build_id(struct perf_tool *tool,
union perf_event *event,
struct perf_session *session);
+bool is_perf_magic(u64 magic);

/*
* arch specific callback
--
1.7.9.5