Avoid a conversion error in gzseek when off_t type too small.
This is a problem in the odd case that the second argument of
LSEEK is a larger type than off_t. Apparently MinGW defines off_t
to be 32 bits, but _lseeki64 has a 64-bit second argument.
Also undo a previous commit to permit MinGW to use _lseeki64.
diff --git a/gzlib.c b/gzlib.c
index 4105e6a..4838bf0 100644
--- a/gzlib.c
+++ b/gzlib.c
@@ -5,7 +5,7 @@
#include "gzguts.h"
-#if defined(_WIN32) && !defined(__BORLANDC__) && !defined(__MINGW32__)
+#if defined(_WIN32) && !defined(__BORLANDC__)
# define LSEEK _lseeki64
#else
#if defined(_LARGEFILE64_SOURCE) && _LFS64_LARGEFILE-0
@@ -397,7 +397,7 @@
/* if within raw area while reading, just go there */
if (state->mode == GZ_READ && state->how == COPY &&
state->x.pos + offset >= 0) {
- ret = LSEEK(state->fd, offset - state->x.have, SEEK_CUR);
+ ret = LSEEK(state->fd, offset - (z_off64_t)state->x.have, SEEK_CUR);
if (ret == -1)
return -1;
state->x.have = 0;