1 /* dvb_chartbl.c
2 * Routines for handling DVB-SI character tables (as defined in EN 300 468)
3 *
4 * Wireshark - Network traffic analyzer
5 * By Gerald Combs <gerald@wireshark.org>
6 * Copyright 1998 Gerald Combs
7 *
8 * SPDX-License-Identifier: GPL-2.0-or-later
9 */
10
11 #include "config.h"
12
13 #include <glib.h>
14
15 #include <epan/proto.h>
16 #include <epan/tvbuff.h>
17 #include <epan/value_string.h>
18
19 #include "dvb_chartbl.h"
20
21
22 static const value_string dvb_string_encoding_vals[] = {
23 { DVB_ENCODING_INVALID, "Incorrect length for encoding" },
24 { DVB_ENCODING_RESERVED, "Reserved for future use" },
25 { DVB_ENCODING_UNKNOWN, "Unknown/undefined encoding" },
26
27 { DVB_ENCODING_LATIN, "Latin (default table)" },
28
29 { DVB_ENCODING_ISO_8859_1, "ISO/IEC 8859-1 (West European)" },
30 { DVB_ENCODING_ISO_8859_2, "ISO/IEC 8859-2 (East European)" },
31 { DVB_ENCODING_ISO_8859_3, "ISO/IEC 8859-3 (South European)" },
32 { DVB_ENCODING_ISO_8859_4, "ISO/IEC 8859-4 (North and North-East European)" },
33 { DVB_ENCODING_ISO_8859_5, "ISO/IEC 8859-5 (Latin/Cyrillic)" },
34 { DVB_ENCODING_ISO_8859_6, "ISO/IEC 8859-6 (Latin/Arabic)" },
35 { DVB_ENCODING_ISO_8859_7, "ISO/IEC 8859-7 (Latin/Greek)" },
36 { DVB_ENCODING_ISO_8859_8, "ISO/IEC 8859-8 (Latin/Hebrew)" },
37 { DVB_ENCODING_ISO_8859_9, "ISO/IEC 8859-9 (West European & Turkish)" },
38 { DVB_ENCODING_ISO_8859_10, "ISO/IEC 8859-10 (North European)" },
39 { DVB_ENCODING_ISO_8859_11, "ISO/IEC 8859-11 (Thai)" },
40 { DVB_ENCODING_ISO_8859_13, "ISO/IEC 8859-13 (Baltic)" },
41 { DVB_ENCODING_ISO_8859_14, "ISO/IEC 8859-14 (Celtic)" },
42 { DVB_ENCODING_ISO_8859_15, "ISO/IEC 8859-15 (West European)" },
43 { DVB_ENCODING_ISO_10646_BMP, "ISO/IEC 10646 Basic Multilingual Plane" },
44 { DVB_ENCODING_KSX_1001, "KSX 1001-2004 (Korean character set)" },
45 { DVB_ENCODING_GB_2312, "GB-2312-1980 (Simplified Chinese)" },
46 { DVB_ENCODING_ISO_10646_BIG5, "ISO/IEC 10646 BIG5 subset" },
47 { DVB_ENCODING_ISO_10646_UTF8_BMP,
48 "ISO/IEC 10646 Basic Multilingual Plane, UTF-8 encoded" },
49
50 { 0, NULL }
51 };
52
53
54 static dvb_encoding_e
dvb_analyze_string_charset0(guint8 byte0)55 dvb_analyze_string_charset0(guint8 byte0)
56 {
57 switch (byte0) {
58 case 0x01:
59 return DVB_ENCODING_ISO_8859_5;
60 case 0x02:
61 return DVB_ENCODING_ISO_8859_6;
62 case 0x03:
63 return DVB_ENCODING_ISO_8859_7;
64 case 0x04:
65 return DVB_ENCODING_ISO_8859_8;
66 case 0x05:
67 return DVB_ENCODING_ISO_8859_9;
68 case 0x06:
69 return DVB_ENCODING_ISO_8859_10;
70 case 0x07:
71 return DVB_ENCODING_ISO_8859_11;
72 case 0x08:
73 return DVB_ENCODING_RESERVED; /* was reserved for ISO-8859-12 */
74 case 0x09:
75 return DVB_ENCODING_ISO_8859_13;
76 case 0x0A:
77 return DVB_ENCODING_ISO_8859_14;
78 case 0x0B:
79 return DVB_ENCODING_ISO_8859_15;
80 case 0x11:
81 return DVB_ENCODING_ISO_10646_BMP;
82 case 0x12:
83 return DVB_ENCODING_KSX_1001;
84 case 0x13:
85 return DVB_ENCODING_GB_2312;
86 case 0x14:
87 return DVB_ENCODING_ISO_10646_BIG5;
88 case 0x15:
89 return DVB_ENCODING_ISO_10646_UTF8_BMP;
90
91 default:
92 return DVB_ENCODING_UNKNOWN;
93 }
94 }
95
96
97 static dvb_encoding_e
dvb_analyze_string_charset0_10(guint16 byte12)98 dvb_analyze_string_charset0_10(guint16 byte12)
99 {
100 switch (byte12) {
101 case 0x0000:
102 return DVB_ENCODING_RESERVED;
103 case 0x0001:
104 return DVB_ENCODING_ISO_8859_1;
105 case 0x0002:
106 return DVB_ENCODING_ISO_8859_2;
107 case 0x0003:
108 return DVB_ENCODING_ISO_8859_3;
109 case 0x0004:
110 return DVB_ENCODING_ISO_8859_4;
111 case 0x0005:
112 return DVB_ENCODING_ISO_8859_5;
113 case 0x0006:
114 return DVB_ENCODING_ISO_8859_6;
115 case 0x0007:
116 return DVB_ENCODING_ISO_8859_7;
117 case 0x0008:
118 return DVB_ENCODING_ISO_8859_8;
119 case 0x0009:
120 return DVB_ENCODING_ISO_8859_9;
121 case 0x000A:
122 return DVB_ENCODING_ISO_8859_10;
123 case 0x000B:
124 return DVB_ENCODING_ISO_8859_11;
125 case 0x000C:
126 return DVB_ENCODING_RESERVED;
127 case 0x000D:
128 return DVB_ENCODING_ISO_8859_13;
129 case 0x000E:
130 return DVB_ENCODING_ISO_8859_14;
131 case 0x000F:
132 return DVB_ENCODING_ISO_8859_15;
133
134 default: /* 0x10 XX XX */
135 return DVB_ENCODING_UNKNOWN;
136 }
137 }
138
139
140 static dvb_encoding_e
dvb_analyze_string_charset0_1F(guint8 byte1)141 dvb_analyze_string_charset0_1F(guint8 byte1)
142 {
143 /* http://www.dvbservices.com/identifiers/encoding_type_id */
144
145 switch (byte1) {
146 case 0x00: /* 0x1F 0x00 */
147 return DVB_ENCODING_RESERVED;
148 case 0x01:
149 case 0x02:
150 case 0x03:
151 case 0x04:
152 /* XXX: BBC */
153 return DVB_ENCODING_RESERVED;
154 case 0x05:
155 case 0x06:
156 /* XXX: Malaysian Technical Standards Forum Bhd */
157 return DVB_ENCODING_RESERVED;
158
159 default: /* 0x1F XX */
160 return DVB_ENCODING_RESERVED;
161 }
162 }
163
164
165 guint
dvb_analyze_string_charset(tvbuff_t * tvb,int offset,int length,dvb_encoding_e * encoding)166 dvb_analyze_string_charset(tvbuff_t *tvb, int offset, int length, dvb_encoding_e *encoding)
167 {
168 if (length >= 1) {
169 guint8 byte0 = tvb_get_guint8(tvb, offset + 0);
170
171 if (byte0 >= 0x20) {
172 /* the first byte is a normal character, not the number of a character table */
173 *encoding = DVB_ENCODING_LATIN;
174 return 0;
175
176 } else if (byte0 == 0x1F) {
177 if (length >= 2) {
178 *encoding = dvb_analyze_string_charset0_1F(tvb_get_guint8(tvb, offset + 1));
179 return 2;
180 }
181 *encoding = DVB_ENCODING_INVALID;
182 return 1;
183
184 } else if (byte0 >= 0x16) { /* 16 ... 1E */
185 *encoding = DVB_ENCODING_RESERVED;
186 return 1;
187
188 } else if (byte0 == 0x10) {
189 if (length >= 3) {
190 *encoding = dvb_analyze_string_charset0_10(tvb_get_ntohs(tvb, offset + 1));
191 return 3;
192 }
193 *encoding = DVB_ENCODING_INVALID;
194 return 1;
195
196 } else if ((byte0 >= 0x0C && byte0 <= 0x0F)) {
197 *encoding = DVB_ENCODING_RESERVED;
198 return 1;
199 } else {
200 *encoding = dvb_analyze_string_charset0(byte0);
201 return 1;
202 }
203 } else
204 *encoding = DVB_ENCODING_LATIN;
205
206 return 0;
207 }
208
209
210 guint
dvb_enc_to_item_enc(dvb_encoding_e encoding)211 dvb_enc_to_item_enc(dvb_encoding_e encoding)
212 {
213 /* XXX: take ISO control codes into account,
214 e.g. 0x86 - turn emphasis on ; 0x87 - turn emphasis off */
215
216 switch (encoding) {
217 case DVB_ENCODING_ISO_8859_1:
218 return ENC_ISO_8859_1 | ENC_NA;
219
220 case DVB_ENCODING_ISO_8859_2:
221 return ENC_ISO_8859_2 | ENC_NA;
222
223 case DVB_ENCODING_ISO_8859_3:
224 return ENC_ISO_8859_3 | ENC_NA;
225
226 case DVB_ENCODING_ISO_8859_4:
227 return ENC_ISO_8859_4 | ENC_NA;
228
229 case DVB_ENCODING_ISO_8859_5:
230 return ENC_ISO_8859_5 | ENC_NA;
231
232 case DVB_ENCODING_ISO_8859_6:
233 return ENC_ISO_8859_6 | ENC_NA;
234
235 case DVB_ENCODING_ISO_8859_7:
236 return ENC_ISO_8859_7 | ENC_NA;
237
238 case DVB_ENCODING_ISO_8859_8:
239 return ENC_ISO_8859_8 | ENC_NA;
240
241 case DVB_ENCODING_ISO_8859_9:
242 return ENC_ISO_8859_9 | ENC_NA;
243
244 case DVB_ENCODING_ISO_8859_10:
245 return ENC_ISO_8859_10 | ENC_NA;
246
247 case DVB_ENCODING_ISO_8859_11:
248 return ENC_ISO_8859_11 | ENC_NA;
249
250 case DVB_ENCODING_ISO_8859_13:
251 return ENC_ISO_8859_13 | ENC_NA;
252
253 case DVB_ENCODING_ISO_8859_14:
254 return ENC_ISO_8859_14 | ENC_NA;
255
256 case DVB_ENCODING_ISO_8859_15:
257 return ENC_ISO_8859_15 | ENC_NA;
258
259 case DVB_ENCODING_ISO_10646_UTF8_BMP:
260 return ENC_UTF_8 | ENC_NA;
261
262 default: /* not supported */
263 return ENC_ASCII | ENC_NA;
264 }
265 }
266
267
268 void
dvb_add_chartbl(proto_tree * tree,int hf,tvbuff_t * tvb,gint offset,gint length,dvb_encoding_e encoding)269 dvb_add_chartbl(proto_tree *tree, int hf,
270 tvbuff_t *tvb, gint offset, gint length, dvb_encoding_e encoding)
271 {
272 if (tree == NULL)
273 return;
274
275 if (length==0) {
276 proto_item *pi;
277
278 pi = proto_tree_add_bytes_format(tree, hf, tvb, 0, 0, NULL,
279 "Default character table (Latin)");
280 proto_item_set_generated(pi);
281 }
282 else {
283 proto_tree_add_bytes_format_value(tree, hf,
284 tvb, offset, length, NULL, "%s (%s)",
285 val_to_str_const(encoding, dvb_string_encoding_vals, "Unknown"),
286 tvb_bytes_to_str_punct(PNODE_POOL(tree), tvb, offset, length, ' '));
287 }
288 }
289
290 /*
291 * Editor modelines - https://www.wireshark.org/tools/modelines.html
292 *
293 * Local variables:
294 * c-basic-offset: 4
295 * tab-width: 8
296 * indent-tabs-mode: nil
297 * End:
298 *
299 * vi: set shiftwidth=4 tabstop=8 expandtab:
300 * :indentSize=4:tabSize=8:noTabs=true:
301 */
302