Add nghttp2_option_set_max_deflate_dynamic_table_size() API function

nghttp2_option_set_max_deflate_dynamic_table_size function sets the
maximum dynamic table size for header block deflater.  The default
value is 4KiB.

lib/includes/nghttp2/nghttp2.h

@@ -2532,6 +2532,19 @@ NGHTTP2_EXTERN void
 nghttp2_option_set_max_send_header_block_length(nghttp2_option *option,
                                                 size_t val);
 
+/**
+ * @function
+ *
+ * This option sets the maximum dynamic table size for deflating
+ * header fields.  The default value is 4KiB.  In HTTP/2, receiver of
+ * deflated header block can specify maximum dynamic table size.  The
+ * actual maximum size is the minimum of the size receiver specified
+ * and this option value.
+ */
+NGHTTP2_EXTERN void
+nghttp2_option_set_max_deflate_dynamic_table_size(nghttp2_option *option,
+                                                  size_t val);
+
 /**
  * @function
  *

lib/nghttp2_option.c

@@ -101,3 +101,9 @@ void nghttp2_option_set_max_send_header_block_length(nghttp2_option *option,
   option->opt_set_mask |= NGHTTP2_OPT_MAX_SEND_HEADER_BLOCK_LENGTH;
   option->max_send_header_block_length = val;
 }
+
+void nghttp2_option_set_max_deflate_dynamic_table_size(nghttp2_option *option,
+                                                       size_t val) {
+  option->opt_set_mask |= NGHTTP2_OPT_MAX_DEFLATE_DYNAMIC_TABLE_SIZE;
+  option->max_deflate_dynamic_table_size = val;
+}

lib/nghttp2_option.h

@@ -64,6 +64,7 @@ typedef enum {
   NGHTTP2_OPT_NO_AUTO_PING_ACK = 1 << 6,
   NGHTTP2_OPT_BUILTIN_RECV_EXT_TYPES = 1 << 7,
   NGHTTP2_OPT_MAX_SEND_HEADER_BLOCK_LENGTH = 1 << 8,
+  NGHTTP2_OPT_MAX_DEFLATE_DYNAMIC_TABLE_SIZE = 1 << 9,
 } nghttp2_option_flag;
 
 /**
@@ -74,6 +75,10 @@ struct nghttp2_option {
    * NGHTTP2_OPT_MAX_SEND_HEADER_BLOCK_LENGTH
    */
   size_t max_send_header_block_length;
+  /**
+   * NGHTTP2_OPT_MAX_DEFLATE_DYNAMIC_TABLE_SIZE
+   */
+  size_t max_deflate_dynamic_table_size;
   /**
    * Bitwise OR of nghttp2_option_flag to determine that which fields
    * are specified.

lib/nghttp2_session.c

@@ -390,6 +390,8 @@ static int session_new(nghttp2_session **session_ptr,
                        const nghttp2_option *option, nghttp2_mem *mem) {
   int rv;
   size_t nbuffer;
+  size_t max_deflate_dynamic_table_size =
+      NGHTTP2_HD_DEFAULT_MAX_DEFLATE_BUFFER_SIZE;
 
   if (mem == NULL) {
     mem = nghttp2_mem_default();
@@ -407,19 +409,6 @@ static int session_new(nghttp2_session **session_ptr,
   /* next_stream_id is initialized in either
      nghttp2_session_client_new2 or nghttp2_session_server_new2 */
 
-  rv = nghttp2_hd_deflate_init(&(*session_ptr)->hd_deflater, mem);
-  if (rv != 0) {
-    goto fail_hd_deflater;
-  }
-  rv = nghttp2_hd_inflate_init(&(*session_ptr)->hd_inflater, mem);
-  if (rv != 0) {
-    goto fail_hd_inflater;
-  }
-  rv = nghttp2_map_init(&(*session_ptr)->streams, mem);
-  if (rv != 0) {
-    goto fail_map;
-  }
-
   nghttp2_stream_init(&(*session_ptr)->root, 0, NGHTTP2_STREAM_FLAG_NONE,
                       NGHTTP2_STREAM_IDLE, NGHTTP2_DEFAULT_WEIGHT, 0, 0, NULL,
                       mem);
@@ -502,6 +491,24 @@ static int session_new(nghttp2_session **session_ptr,
       (*session_ptr)->max_send_header_block_length =
           option->max_send_header_block_length;
     }
+
+    if (option->opt_set_mask & NGHTTP2_OPT_MAX_DEFLATE_DYNAMIC_TABLE_SIZE) {
+      max_deflate_dynamic_table_size = option->max_deflate_dynamic_table_size;
+    }
+  }
+
+  rv = nghttp2_hd_deflate_init2(&(*session_ptr)->hd_deflater,
+                                max_deflate_dynamic_table_size, mem);
+  if (rv != 0) {
+    goto fail_hd_deflater;
+  }
+  rv = nghttp2_hd_inflate_init(&(*session_ptr)->hd_inflater, mem);
+  if (rv != 0) {
+    goto fail_hd_inflater;
+  }
+  rv = nghttp2_map_init(&(*session_ptr)->streams, mem);
+  if (rv != 0) {
+    goto fail_map;
   }
 
   nbuffer = ((*session_ptr)->max_send_header_block_length +

tests/nghttp2_session_test.c

@@ -6666,33 +6666,45 @@ void test_nghttp2_session_set_option(void) {
   nghttp2_session *session;
   nghttp2_session_callbacks callbacks;
   nghttp2_option *option;
+  nghttp2_hd_deflater *deflater;
+  int rv;
 
-  nghttp2_option_new(&option);
+  memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
+  callbacks.send_callback = null_send_callback;
 
+  /* Test for nghttp2_option_set_no_auto_window_update */
+  nghttp2_option_new(&option);
   nghttp2_option_set_no_auto_window_update(option, 1);
 
-  memset(&callbacks, 0, sizeof(nghttp2_session_callbacks));
   nghttp2_session_client_new2(&session, &callbacks, NULL, option);
 
   CU_ASSERT(session->opt_flags & NGHTTP2_OPTMASK_NO_AUTO_WINDOW_UPDATE);
 
   nghttp2_session_del(session);
+  nghttp2_option_del(option);
 
+  /* Test for nghttp2_option_set_peer_max_concurrent_streams */
+  nghttp2_option_new(&option);
   nghttp2_option_set_peer_max_concurrent_streams(option, 100);
 
   nghttp2_session_client_new2(&session, &callbacks, NULL, option);
 
   CU_ASSERT(100 == session->remote_settings.max_concurrent_streams);
   nghttp2_session_del(session);
+  nghttp2_option_del(option);
 
+  /* Test for nghttp2_option_set_max_reserved_remote_streams */
+  nghttp2_option_new(&option);
   nghttp2_option_set_max_reserved_remote_streams(option, 99);
 
   nghttp2_session_client_new2(&session, &callbacks, NULL, option);
 
   CU_ASSERT(99 == session->max_incoming_reserved_streams);
   nghttp2_session_del(session);
+  nghttp2_option_del(option);
 
   /* Test for nghttp2_option_set_no_auto_ping_ack */
+  nghttp2_option_new(&option);
   nghttp2_option_set_no_auto_ping_ack(option, 1);
 
   nghttp2_session_client_new2(&session, &callbacks, NULL, option);
@@ -6700,7 +6712,27 @@ void test_nghttp2_session_set_option(void) {
   CU_ASSERT(session->opt_flags & NGHTTP2_OPTMASK_NO_AUTO_PING_ACK);
 
   nghttp2_session_del(session);
+  nghttp2_option_del(option);
 
+  /* Test for nghttp2_option_set_max_deflate_dynamic_table_size */
+  nghttp2_option_new(&option);
+  nghttp2_option_set_max_deflate_dynamic_table_size(option, 0);
+
+  nghttp2_session_client_new2(&session, &callbacks, NULL, option);
+
+  deflater = &session->hd_deflater;
+
+  rv = nghttp2_submit_request(session, NULL, reqnv, ARRLEN(reqnv), NULL, NULL);
+
+  CU_ASSERT(1 == rv);
+
+  rv = nghttp2_session_send(session);
+
+  CU_ASSERT(0 == rv);
+  CU_ASSERT(0 == deflater->deflate_hd_table_bufsize_max);
+  CU_ASSERT(0 == deflater->ctx.hd_table_bufsize);
+
+  nghttp2_session_del(session);
   nghttp2_option_del(option);
 }