[PATCH 19/24] perf tools: Add is_perf_data function

[Jiri Olsa]

Adding is_perf_data function that returns true if
the given path is perf data file. It will be used
in following patches.

Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
---
 tools/perf/util/data.c | 19 +++++++++++++++++++
 tools/perf/util/data.h |  1 +
 2 files changed, 20 insertions(+)

diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
index c47aa34fdc0a..be049e812f5a 100644
--- a/tools/perf/util/data.c
+++ b/tools/perf/util/data.c
@@ -457,3 +457,22 @@ char *perf_data__kallsyms_name(struct perf_data *data)
 
 	return kallsyms_name;
 }
+
+bool is_perf_data(const char *path)
+{
+	bool ret = false;
+	FILE *file;
+	u64 magic;
+
+	file = fopen(path, "r");
+	if (!file)
+		return false;
+
+	if (fread(&magic, 1, 8, file) < 8)
+		goto out;
+
+	ret = is_perf_magic(magic);
+out:
+	fclose(file);
+	return ret;
+}
diff --git a/tools/perf/util/data.h b/tools/perf/util/data.h
index 75947ef6bc17..0ebb1568ca86 100644
--- a/tools/perf/util/data.h
+++ b/tools/perf/util/data.h
@@ -89,4 +89,5 @@ int perf_data__update_dir(struct perf_data *data);
 unsigned long perf_data__size(struct perf_data *data);
 int perf_data__make_kcore_dir(struct perf_data *data, char *buf, size_t buf_sz);
 char *perf_data__kallsyms_name(struct perf_data *data);
+bool is_perf_data(const char *path);
 #endif /* __PERF_DATA_H */
-- 
2.26.2