response.c: file_reader(): add support for W32 64-bit seek

3 files changed, 9 insertions, 0 deletions

diff --git a/configure.ac b/configure.ac
index 3f7fb8f6..1e1187ad 100644
--- a/configure.ac
+++ b/configure.ac
@@ -608,6 +608,7 @@ AM_CONDITIONAL(HAVE_SPDYLAY, [test "x$have_spdylay" = "xyes"])
 # large file support (> 4 GB)
 AC_SYS_LARGEFILE
 AC_FUNC_FSEEKO
+AC_CHECK_FUNCS([_lseeki64])
 
 # optional: have error messages ?
 AC_MSG_CHECKING(whether to generate error messages)
diff --git a/src/microhttpd/response.c b/src/microhttpd/response.c
index 4a6382f8..32e679f4 100644
--- a/src/microhttpd/response.c
+++ b/src/microhttpd/response.c
@@ -329,11 +329,16 @@ file_reader (void *cls, uint64_t pos, char *buf, size_t max)
   if (offset64 < 0)
     return MHD_CONTENT_READER_END_WITH_ERROR; /* seek to required position is not possible */
 
+#if defined(HAVE___LSEEKI64)
+  if (_lseeki64 (response->fd, offset64, SEEK_SET) != offset64)
+    return MHD_CONTENT_READER_END_WITH_ERROR; /* can't seek to required position */
+#else /* !HAVE___LSEEKI64 */
   if (sizeof(off_t) < sizeof(uint64_t) && offset64 > (uint64_t)INT32_MAX)
     return MHD_CONTENT_READER_END_WITH_ERROR; /* seek to required position is not possible */
 
   if (lseek (response->fd, (off_t)offset64, SEEK_SET) != (off_t)offset64)
     return MHD_CONTENT_READER_END_WITH_ERROR; /* can't seek to required position */
+#endif
 
   n = read (response->fd, buf, max);
   if (0 == n)
diff --git a/w32/VS2013/MHD_config.h b/w32/VS2013/MHD_config.h
index 07f1fbbb..645389b2 100644
--- a/w32/VS2013/MHD_config.h
+++ b/w32/VS2013/MHD_config.h
@@ -70,6 +70,9 @@
    don't. */
 #define HAVE_DECL_TCP_NOPUSH 0
 
+/* Define to 1 if you have the `_lseeki64' function. */
+#define HAVE___LSEEKI64 1
+
 
 /* *** Headers information *** */
 /* Not really important as not used by code currently */