[PATCH v6 02/11] trace-cmd dump: Print compression header

["Tzvetomir Stoyanov (VMware)" <tz.stoyanov@gmail.com>]

Dump the compression header of trace file version 7

Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com>
---
 tracecmd/trace-dump.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/tracecmd/trace-dump.c b/tracecmd/trace-dump.c
index 23733194..1503e2bf 100644
--- a/tracecmd/trace-dump.c
+++ b/tracecmd/trace-dump.c
@@ -217,6 +217,29 @@ static void dump_initial_format(int fd)
 	do_print(SUMMARY, "\t\t%d\t[Page size, bytes]\n", val4);
 }
 
+static void dump_compress(int fd)
+{
+	char zname[DUMP_SIZE];
+	char zver[DUMP_SIZE];
+
+	if (file_version < FILE_VERSION_COMPRESSION)
+		return;
+
+	/* get compression header */
+	if (read_file_string(fd, zname, DUMP_SIZE))
+		die("no compression header");
+	if (read_file_string(fd, zver, DUMP_SIZE))
+		die("no compression version");
+	do_print((SUMMARY), "\t\t%s\t[Compression algorithm]\n", zname);
+	do_print((SUMMARY), "\t\t%s\t[Compression version]\n", zver);
+
+	if (strcmp(zname, "none")) {
+		compress = tracecmd_compress_alloc(zname, zver, fd, tep, NULL);
+		if (!compress)
+			die("cannot uncompress the file");
+	}
+}
+
 static void dump_header_page(int fd)
 {
 	unsigned long long size;
@@ -760,6 +783,7 @@ static void dump_file(const char *file)
 	do_print(SUMMARY, "\n Tracing meta data in file %s:\n", file);
 
 	dump_initial_format(fd);
+	dump_compress(fd);
 	dump_header_page(fd);
 	dump_header_event(fd);
 	dump_ftrace_events_format(fd);
-- 
2.33.1