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perf tools: Add gzip_is_compressed function

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Add implementation of the is_compressed callback for gzip.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Michael Petlan <mpetlan@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/20180817094813.15086-13-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2018-08-17 11:48:12 +02:00 committed by Arnaldo Carvalho de Melo
parent 4b57fd44b6
commit 88c74dc76a
1 changed files with 14 additions and 2 deletions
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16
tools/perf/util/zlib.c
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@ -6,6 +6,7 @@
#include <sys/mman.h>
#include <zlib.h>
#include <linux/compiler.h>
#include <unistd.h>
#include "util/compress.h"
#include "util/util.h"
@ -81,7 +82,18 @@ int gzip_decompress_to_file(const char *input, int output_fd)
return ret == Z_STREAM_END ? 0 : -1;
}
bool gzip_is_compressed(const char *input __maybe_unused)
bool gzip_is_compressed(const char *input)
{
return true;
int fd = open(input, O_RDONLY);
const uint8_t magic[2] = { 0x1f, 0x8b };
char buf[2] = { 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;
}