From 8c064a5f299a7a48cf10ee81f45b8d7c6f595f07 Mon Sep 17 00:00:00 2001
From: Mark Bicknell <mark.bicknell@nanoporetech.com>
Date: Tue, 17 Jul 2018 10:17:44 +0100
Subject: [PATCH] Fixed mm_idx_is_idx to return the correct result on Windows.

---
 index.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/index.c b/index.c
index d7ddc6e..655a567 100644
--- a/index.c
+++ b/index.c
@@ -512,14 +512,19 @@ mm_idx_t *mm_idx_load(FILE *fp)
 int64_t mm_idx_is_idx(const char *fn)
 {
 	int fd, is_idx = 0;
-	off_t ret, off_end;
+	int64_t ret, off_end;
 	char magic[4];
 
 	if (strcmp(fn, "-") == 0) return 0; // read from pipe; not an index
 	fd = open(fn, O_RDONLY);
 	if (fd < 0) return -1; // error
+#ifdef WIN32
+	if ((off_end = _lseeki64(fd, 0, SEEK_END)) >= 4) {
+		_lseeki64(fd, 0, SEEK_SET);
+#else
 	if ((off_end = lseek(fd, 0, SEEK_END)) >= 4) {
 		lseek(fd, 0, SEEK_SET);
+#endif // WIN32
 		ret = read(fd, magic, 4);
 		if (ret == 4 && strncmp(magic, MM_IDX_MAGIC, 4) == 0)
 			is_idx = 1;