1/* Copyright JS Foundation and other contributors, http://js.foundation
2 *
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16#include "jerryscript-ext/debugger.h"
17#include "jext-common.h"
18
19#if defined (JERRY_DEBUGGER) && (JERRY_DEBUGGER == 1)
20
21/* A simplified transmission layer. */
22
23/**
24 * Size of the raw packet header.
25 */
26#define JERRYX_DEBUGGER_RAWPACKET_HEADER_SIZE 1
27/**
28 * Maximum message size with 1 byte size field.
29 */
30#define JERRYX_DEBUGGER_RAWPACKET_ONE_BYTE_LEN_MAX 255
31
32/**
33 * Header for incoming packets.
34 */
35typedef struct
36{
37 uint8_t size; /**< size of the message */
38} jerryx_rawpacket_receive_header_t;
39
40/**
41 * Close a tcp connection.
42 */
43static void
44jerryx_debugger_rp_close (jerry_debugger_transport_header_t *header_p) /**< header for the transport interface */
45{
46 JERRYX_ASSERT (!jerry_debugger_transport_is_connected ());
47
48 jerry_heap_free ((void *) header_p, sizeof (jerry_debugger_transport_header_t));
49} /* jerryx_debugger_rp_close */
50
51/**
52 * Send data over a simple raw packet connection.
53 *
54 * @return true - if the data has been sent successfully
55 * false - otherwise
56 */
57static bool
58jerryx_debugger_rp_send (jerry_debugger_transport_header_t *header_p, /**< header for the transport interface */
59 uint8_t *message_p, /**< message to be sent */
60 size_t message_length) /**< message length in bytes */
61{
62 JERRYX_ASSERT (message_length <= JERRYX_DEBUGGER_RAWPACKET_ONE_BYTE_LEN_MAX);
63
64 message_p[-1] = (uint8_t) message_length;
65
66 return header_p->next_p->send (header_p->next_p, message_p - 1, message_length + 1);
67} /* jerryx_debugger_rp_send */
68
69/**
70 * Receive data from a rawpacket connection.
71 *
72 * @return true - if data has been received successfully
73 * false - otherwise
74 */
75static bool
76jerryx_debugger_rp_receive (jerry_debugger_transport_header_t *header_p, /**< header for the transport interface */
77 jerry_debugger_transport_receive_context_t *receive_context_p) /**< receive context */
78{
79 if (!header_p->next_p->receive (header_p->next_p, receive_context_p))
80 {
81 return false;
82 }
83
84 if (receive_context_p->message_p == NULL)
85 {
86 return true;
87 }
88
89 size_t message_total_length = receive_context_p->message_total_length;
90
91 if (message_total_length == 0)
92 {
93 /* Byte stream. */
94 if (receive_context_p->message_length < sizeof (jerryx_rawpacket_receive_header_t))
95 {
96 receive_context_p->message_p = NULL;
97 return true;
98 }
99 }
100 else
101 {
102 /* Datagram packet. */
103 JERRYX_ASSERT (receive_context_p->message_length >= sizeof (jerryx_rawpacket_receive_header_t));
104 }
105
106 uint8_t *message_p = receive_context_p->message_p;
107 size_t message_length = (size_t) (message_p[0]);
108
109 if (message_total_length == 0)
110 {
111 size_t new_total_length = message_length + sizeof (jerryx_rawpacket_receive_header_t);
112
113 /* Byte stream. */
114 if (receive_context_p->message_length < new_total_length)
115 {
116 receive_context_p->message_p = NULL;
117 return true;
118 }
119
120 receive_context_p->message_total_length = new_total_length;
121 }
122 else
123 {
124 /* Datagram packet. */
125 JERRYX_ASSERT (receive_context_p->message_length == (message_length + sizeof (jerryx_rawpacket_receive_header_t)));
126 }
127
128 receive_context_p->message_p = message_p + sizeof (jerryx_rawpacket_receive_header_t);
129 receive_context_p->message_length = message_length;
130
131 return true;
132} /* jerryx_debugger_rp_receive */
133
134/**
135 * Initialize a simple raw packet transmission layer.
136 *
137 * @return true - if the connection succeeded
138 * false - otherwise
139 */
140bool
141jerryx_debugger_rp_create (void)
142{
143 const size_t interface_size = sizeof (jerry_debugger_transport_header_t);
144 jerry_debugger_transport_header_t *header_p;
145 header_p = (jerry_debugger_transport_header_t *) jerry_heap_alloc (interface_size);
146
147 if (!header_p)
148 {
149 return false;
150 }
151
152 header_p->close = jerryx_debugger_rp_close;
153 header_p->send = jerryx_debugger_rp_send;
154 header_p->receive = jerryx_debugger_rp_receive;
155
156 jerry_debugger_transport_add (header_p,
157 JERRYX_DEBUGGER_RAWPACKET_HEADER_SIZE,
158 JERRYX_DEBUGGER_RAWPACKET_ONE_BYTE_LEN_MAX,
159 JERRYX_DEBUGGER_RAWPACKET_HEADER_SIZE,
160 JERRYX_DEBUGGER_RAWPACKET_ONE_BYTE_LEN_MAX);
161
162 return true;
163} /* jerryx_debugger_rp_create */
164
165#else /* !(defined (JERRY_DEBUGGER) && (JERRY_DEBUGGER == 1)) */
166
167/**
168 * Dummy function when debugger is disabled.
169 *
170 * @return false
171 */
172bool
173jerryx_debugger_rp_create (void)
174{
175 return false;
176} /* jerryx_debugger_rp_create */
177
178#endif /* defined (JERRY_DEBUGGER) && (JERRY_DEBUGGER == 1) */
179