lsquic_di_error.c revision 461e84d8 
1/* Copyright (c) 2017 LiteSpeed Technologies Inc.  See LICENSE. */
2/*
3 * lsquic_di_error.c -- A placeholder when things go wrong
4 *
5 * This object is used in order to avoid dereferencing NULLs in stream.c
6 */
7
8
9#include <assert.h>
10#include <stddef.h>
11#include <stdint.h>
12#ifdef WIN32
13#include <vc_compat.h>
14#endif
15
16#include "lsquic_data_in_if.h"
17
18
19
20
21
22
23
24
25static void
26error_di_destroy (struct data_in *data_in)
27{
28}
29
30
31static enum ins_frame
32error_di_insert_frame (struct data_in *data_in,
33                        struct stream_frame *new_frame, uint64_t read_offset)
34{
35    return INS_FRAME_ERR;
36}
37
38
39static struct data_frame *
40error_di_get_frame (struct data_in *data_in, uint64_t read_offset)
41{
42    return NULL;
43}
44
45
46static void
47error_di_frame_done (struct data_in *data_in, struct data_frame *data_frame)
48{
49}
50
51
52static int
53error_di_empty (struct data_in *data_in)
54{
55    return 1;
56}
57
58
59struct data_in *
60error_di_switch_impl (struct data_in *data_in, uint64_t read_offset)
61{
62    assert(0);
63    return data_in;
64}
65
66
67static size_t
68error_di_mem_used (struct data_in *data_in)
69{
70    return 0;
71}
72
73
74static const struct data_in_iface di_if_error = {
75    .di_destroy      = error_di_destroy,
76    .di_empty        = error_di_empty,
77    .di_frame_done   = error_di_frame_done,
78    .di_get_frame    = error_di_get_frame,
79    .di_insert_frame = error_di_insert_frame,
80    .di_mem_used     = error_di_mem_used,
81    .di_switch_impl  = error_di_switch_impl,
82};
83static const struct data_in error_data_in = {
84    .di_if    = &di_if_error,
85    .di_flags = 0,
86};
87struct data_in *
88data_in_error_new (struct lsquic_conn_public *conn_pub)
89{
90    return (struct data_in *) &error_data_in;
91}
92