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perf tools: Add lzma_is_compressed function

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Add implementation of the is_compressed callback for lzma.

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/20180817094813.15086-12-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2018-08-17 11:48:11 +02:00 committed by Arnaldo Carvalho de Melo
parent 8b42b7e5e8
commit 4b57fd44b6
1 changed files with 17 additions and 2 deletions
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19
tools/perf/util/lzma.c
View file

@ -3,9 +3,13 @@
#include <lzma.h>
#include <stdio.h>
#include <linux/compiler.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "compress.h"
#include "util.h"
#include "debug.h"
#include <unistd.h>
#define BUFSIZE 8192
@ -100,7 +104,18 @@ int lzma_decompress_to_file(const char *input, int output_fd)
return err;
}
bool lzma_is_compressed(const char *input __maybe_unused)
bool lzma_is_compressed(const char *input)
{
return true;
int fd = open(input, O_RDONLY);
const uint8_t magic[6] = { 0xFD, '7', 'z', 'X', 'Z', 0x00 };
char buf[6] = { 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;
}