Fix env_read_header() on Windows

Commit d6d2638acc245116b8f091ac425b6700d06c4713 broke read
on zero-length files.

diff --git a/libraries/liblmdb/mdb.c b/libraries/liblmdb/mdb.c
index 0ba5e2dbd029db1b618e2c8aef12d0a62135b476..b186ba74112980e284f103a4858f7da8d63534d1 100644 (file)
--- a/libraries/liblmdb/mdb.c
+++ b/libraries/liblmdb/mdb.c
@@ -2487,6 +2487,8 @@ mdb_env_read_header(MDB_env *env, MDB_meta *meta)
                memset(&ov, 0, sizeof(ov));
                ov.Offset = off;
                rc = ReadFile(env->me_fd,&pbuf,MDB_PAGESIZE,&len,&ov) ? (int)len : -1;
+               if (rc == -1 && ErrCode() == ERROR_HANDLE_EOF)
+                       rc = 0;
 #else
                rc = pread(env->me_fd, &pbuf, MDB_PAGESIZE, off);
 #endif