BIO_f_zlib: Properly handle BIO_CTRL_PENDING and BIO_CTRL_WPENDING calls.

[openssl.git] / crypto / comp / c_zlib.c

diff --git a/crypto/comp/c_zlib.c b/crypto/comp/c_zlib.c
index d688deee5f23fbb3fea610d8c8788d3a715713f4..1dd7d679981081ca43b20920b65e48fe23033425 100644 (file)
--- a/crypto/comp/c_zlib.c
+++ b/crypto/comp/c_zlib.c
@@ -1,7 +1,7 @@
 /*
  * Copyright 1998-2016 The OpenSSL Project Authors. All Rights Reserved.
  *
- * Licensed under the OpenSSL license (the "License").  You may not use
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
  * this file except in compliance with the License.  You can obtain a copy
  * in the file LICENSE in the source distribution or at
  * https://www.openssl.org/source/license.html
@@ -598,6 +598,28 @@ static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
         BIO_copy_next_retry(b);
         break;
 
+    case BIO_CTRL_WPENDING:
+        if (ctx->obuf == NULL)
+            return 0;
+
+        if (ctx->odone) {
+            ret = ctx->ocount;
+        } else {
+            ret = ctx->ocount;
+            if (ret == 0)
+                /* Unknown amount pending but we are not finished */
+                ret = 1;
+        }
+        if (ret == 0)
+            ret = BIO_ctrl(next, cmd, num, ptr);
+        break;
+
+    case BIO_CTRL_PENDING:
+        ret = ctx->zin.avail_in;
+        if (ret == 0)
+            ret = BIO_ctrl(next, cmd, num, ptr);
+        break;
+
     default:
         ret = BIO_ctrl(next, cmd, num, ptr);
         break;