fix SSL connection issues on platforms with 32-bit off_t
patch by Maxim Dounin

src/core/ngx_config.h

diff --git a/src/core/ngx_config.h b/src/core/ngx_config.h
index ab73079..9762b18 100644
--- a/src/core/ngx_config.h
+++ b/src/core/ngx_config.h
@@ -127,5 +127,7 @@
 #define NGX_MAX_UINT32_VALUE  (uint32_t) 0xffffffff
 #endif
 
+#define NGX_MAX_INT32_VALUE   (uint32_t) 0x7fffffff
+
 
 #endif /* _NGX_CONFIG_H_INCLUDED_ */

src/event/ngx_event_openssl.c

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 2971817..692f506 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -986,10 +986,10 @@
     }
 
 
-    /* the maximum limit size is the maximum uint32_t value - the page size */
+    /* the maximum limit size is the maximum int32_t value - the page size */
 
-    if (limit == 0 || limit > (off_t) (NGX_MAX_UINT32_VALUE - ngx_pagesize)) {
-        limit = NGX_MAX_UINT32_VALUE - ngx_pagesize;
+    if (limit == 0 || limit > (off_t) (NGX_MAX_INT32_VALUE - ngx_pagesize)) {
+        limit = NGX_MAX_INT32_VALUE - ngx_pagesize;
     }
 
     buf = c->ssl->buf;