diff options
Diffstat (limited to 'tools/perf/util/zlib.c')
| -rw-r--r-- | tools/perf/util/zlib.c | 16 |
1 files changed, 14 insertions, 2 deletions
diff --git a/tools/perf/util/zlib.c b/tools/perf/util/zlib.c index e68317214679..902ce6384f57 100644 --- a/tools/perf/util/zlib.c +++ b/tools/perf/util/zlib.c @@ -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 @@ out_close: 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; } |