wolfssl_file_len: return WOLFSSL_BAD_FILETYPE on pipe type

Author: julek-wolfssl

src/bio.c

@@ -1938,6 +1938,8 @@ int wolfSSL_BIO_get_len(WOLFSSL_BIO *bio)
             len = BAD_FUNC_ARG;
         if (len == 0) {
             len = wolfssl_file_len(file, &memSz);
+            if (len == WC_NO_ERR_TRACE(WOLFSSL_BAD_FILETYPE))
+                len = 0;
         }
         if (len == 0) {
             len = (int)memSz;

src/ssl_misc.c

@@ -233,9 +233,10 @@ static int wolfssl_file_len(XFILE fp, long* fileSz)
             if (errno == ESPIPE) {
                 WOLFSSL_ERROR_MSG("wolfssl_file_len: file is a pipe");
                 *fileSz = 0;
-                return 0;
+                ret = WOLFSSL_BAD_FILETYPE;
             }
-            ret = WOLFSSL_BAD_FILE;
+            else
+                ret = WOLFSSL_BAD_FILE;
         }
     }
     /* Move to end of file. */