[v8,02/11] trace-cmd dump: Print compression header

Commit Message

Tzvetomir Stoyanov (VMware) Jan. 26, 2022, 9:53 a.m. UTC

Dump the compression header of trace file version 7

Signed-off-by: Tzvetomir Stoyanov (VMware) <[e-mail]>
---
 tracecmd/trace-dump.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

Patch

diff --git a/tracecmd/trace-dump.c b/tracecmd/trace-dump.c
index a99dbded..6dad0fef 100644
--- a/tracecmd/trace-dump.c
+++ b/tracecmd/trace-dump.c
@@ -219,6 +219,31 @@  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;
@@ -763,6 +788,7 @@  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);