v4.19.13 snapshot.
diff --git a/tools/perf/util/zlib.c b/tools/perf/util/zlib.c
new file mode 100644
index 0000000..902ce63
--- /dev/null
+++ b/tools/perf/util/zlib.c
@@ -0,0 +1,99 @@
+// SPDX-License-Identifier: GPL-2.0
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <zlib.h>
+#include <linux/compiler.h>
+#include <unistd.h>
+
+#include "util/compress.h"
+#include "util/util.h"
+#include "util/debug.h"
+
+
+#define CHUNK_SIZE 16384
+
+int gzip_decompress_to_file(const char *input, int output_fd)
+{
+ int ret = Z_STREAM_ERROR;
+ int input_fd;
+ void *ptr;
+ int len;
+ struct stat stbuf;
+ unsigned char buf[CHUNK_SIZE];
+ z_stream zs = {
+ .zalloc = Z_NULL,
+ .zfree = Z_NULL,
+ .opaque = Z_NULL,
+ .avail_in = 0,
+ .next_in = Z_NULL,
+ };
+
+ input_fd = open(input, O_RDONLY);
+ if (input_fd < 0)
+ return -1;
+
+ if (fstat(input_fd, &stbuf) < 0)
+ goto out_close;
+
+ ptr = mmap(NULL, stbuf.st_size, PROT_READ, MAP_PRIVATE, input_fd, 0);
+ if (ptr == MAP_FAILED)
+ goto out_close;
+
+ if (inflateInit2(&zs, 16 + MAX_WBITS) != Z_OK)
+ goto out_unmap;
+
+ zs.next_in = ptr;
+ zs.avail_in = stbuf.st_size;
+
+ do {
+ zs.next_out = buf;
+ zs.avail_out = CHUNK_SIZE;
+
+ ret = inflate(&zs, Z_NO_FLUSH);
+ switch (ret) {
+ case Z_NEED_DICT:
+ ret = Z_DATA_ERROR;
+ /* fall through */
+ case Z_DATA_ERROR:
+ case Z_MEM_ERROR:
+ goto out;
+ default:
+ break;
+ }
+
+ len = CHUNK_SIZE - zs.avail_out;
+ if (writen(output_fd, buf, len) != len) {
+ ret = Z_DATA_ERROR;
+ goto out;
+ }
+
+ } while (ret != Z_STREAM_END);
+
+out:
+ inflateEnd(&zs);
+out_unmap:
+ munmap(ptr, stbuf.st_size);
+out_close:
+ close(input_fd);
+
+ return ret == Z_STREAM_END ? 0 : -1;
+}
+
+bool gzip_is_compressed(const char *input)
+{
+ 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;
+}