1 /* Conversion from and to IBM933.
2 Copyright (C) 2000-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19 /* IBM933 is designed for the representation of Korean using a stateful
20 EBCDIC encoding scheme. It is also known as CCSID 933 or CP933. See:
21 https://www-01.ibm.com/software/globalization/ccsid/ccsid933.html */
22
23 #include <dlfcn.h>
24 #include <stdint.h>
25 #include <wchar.h>
26 #include <byteswap.h>
27 #include "ibm933.h"
28
29 /* The shift sequences for this charset (it does not use ESC). */
30 #define SI 0x0F /* Shift In, host code to turn DBCS off. */
31 #define SO 0x0E /* Shift Out, host code to turn DBCS on. */
32
33 /* Definitions used in the body of the `gconv' function. */
34 #define CHARSET_NAME "IBM933//"
35 #define FROM_LOOP from_ibm933
36 #define TO_LOOP to_ibm933
37 #define ONE_DIRECTION 0
38 #define FROM_LOOP_MIN_NEEDED_FROM 1
39 #define FROM_LOOP_MAX_NEEDED_FROM 2
40 #define FROM_LOOP_MIN_NEEDED_TO 4
41 #define FROM_LOOP_MAX_NEEDED_TO 4
42 #define TO_LOOP_MIN_NEEDED_FROM 4
43 #define TO_LOOP_MAX_NEEDED_FROM 4
44 #define TO_LOOP_MIN_NEEDED_TO 1
45 #define TO_LOOP_MAX_NEEDED_TO 3
46 #define PREPARE_LOOP \
47 int save_curcs; \
48 int *curcsp = &data->__statep->__count;
49 #define EXTRA_LOOP_ARGS , curcsp
50
51 /* Definitions of initialization and destructor function. */
52 #define DEFINE_INIT 1
53 #define DEFINE_FINI 1
54
55
56 /* Since this is a stateful encoding we have to provide code which resets
57 the output state to the initial state. This has to be done during the
58 flushing. */
59 #define EMIT_SHIFT_TO_INIT \
60 if ((data->__statep->__count & ~7) != sb) \
61 { \
62 if (FROM_DIRECTION) \
63 data->__statep->__count &= 7; \
64 else \
65 { \
66 /* We are not in the initial state. To switch back we have \
67 to emit `SI'. */ \
68 if (__glibc_unlikely (outbuf >= outend)) \
69 /* We don't have enough room in the output buffer. */ \
70 status = __GCONV_FULL_OUTPUT; \
71 else \
72 { \
73 /* Write out the shift sequence. */ \
74 *outbuf++ = SI; \
75 data->__statep->__count &= 7; \
76 } \
77 } \
78 }
79
80
81 /* Since we might have to reset input pointer we must be able to save
82 and restore the state. */
83 #define SAVE_RESET_STATE(Save) \
84 if (Save) \
85 save_curcs = *curcsp; \
86 else \
87 *curcsp = save_curcs
88
89
90 /* Current codeset type. */
91 enum
92 {
93 sb = 0,
94 db = 64
95 };
96
97 /* First, define the conversion function from IBM-933 to UCS4. */
98 #define MIN_NEEDED_INPUT FROM_LOOP_MIN_NEEDED_FROM
99 #define MAX_NEEDED_INPUT FROM_LOOP_MAX_NEEDED_FROM
100 #define MIN_NEEDED_OUTPUT FROM_LOOP_MIN_NEEDED_TO
101 #define MAX_NEEDED_OUTPUT FROM_LOOP_MAX_NEEDED_TO
102 #define LOOPFCT FROM_LOOP
103 #define BODY \
104 { \
105 uint32_t ch = *inptr; \
106 uint32_t res; \
107 \
108 if (__builtin_expect (ch, 0) == SO) \
109 { \
110 /* Shift OUT, change to DBCS converter (redundant escape okay). */ \
111 curcs = db; \
112 ++inptr; \
113 continue; \
114 } \
115 else if (__builtin_expect (ch, 0) == SI) \
116 { \
117 /* Shift IN, change to SBCS converter (redundant escape okay). */ \
118 curcs = sb; \
119 ++inptr; \
120 continue; \
121 } \
122 \
123 if (curcs == sb) \
124 { \
125 /* Use the IBM933 table for single byte. */ \
126 res = __ibm933sb_to_ucs4[ch]; \
127 if (__builtin_expect (res, L'\1') == L'\0' && ch != '\0') \
128 { \
129 /* This is an illegal character. */ \
130 STANDARD_FROM_LOOP_ERR_HANDLER (1); \
131 } \
132 else \
133 { \
134 put32 (outptr, res); \
135 outptr += 4; \
136 } \
137 ++inptr; \
138 } \
139 else \
140 { \
141 const struct gap *rp2 = __ibm933db_to_ucs4_idx; \
142 \
143 assert (curcs == db); \
144 \
145 /* Use the IBM933 table for double byte. */ \
146 if (__glibc_unlikely (inptr + 1 >= inend)) \
147 { \
148 /* The second character is not available. Store the \
149 intermediate result. */ \
150 result = __GCONV_INCOMPLETE_INPUT; \
151 break; \
152 } \
153 \
154 ch = (ch * 0x100) + inptr[1]; \
155 while (ch > rp2->end) \
156 ++rp2; \
157 \
158 if (__builtin_expect (rp2->start == 0xffff, 0) \
159 || __builtin_expect (ch < rp2->start, 0) \
160 || (res = __ibm933db_to_ucs4[ch + rp2->idx], \
161 __builtin_expect (res, L'\1') == L'\0' && ch != '\0')) \
162 { \
163 /* This is an illegal character. */ \
164 STANDARD_FROM_LOOP_ERR_HANDLER (2); \
165 } \
166 else \
167 { \
168 put32 (outptr, res); \
169 outptr += 4; \
170 inptr += 2; \
171 } \
172 } \
173 }
174 #define LOOP_NEED_FLAGS
175 #define EXTRA_LOOP_DECLS , int *curcsp
176 #define INIT_PARAMS int curcs = *curcsp & ~7
177 #define UPDATE_PARAMS *curcsp = curcs
178 #include <iconv/loop.c>
179
180 /* Next, define the other direction. */
181 #define MIN_NEEDED_INPUT TO_LOOP_MIN_NEEDED_FROM
182 #define MAX_NEEDED_INPUT TO_LOOP_MAX_NEEDED_FROM
183 #define MIN_NEEDED_OUTPUT TO_LOOP_MIN_NEEDED_TO
184 #define MAX_NEEDED_OUTPUT TO_LOOP_MAX_NEEDED_TO
185 #define LOOPFCT TO_LOOP
186 #define BODY \
187 { \
188 uint32_t ch = get32 (inptr); \
189 const struct gap *rp1 = __ucs4_to_ibm933sb_idx; \
190 const struct gap *rp2 = __ucs4_to_ibm933db_idx; \
191 \
192 if (__glibc_unlikely (ch >= 0xffff)) \
193 { \
194 UNICODE_TAG_HANDLER (ch, 4); \
195 \
196 STANDARD_TO_LOOP_ERR_HANDLER (4); \
197 } \
198 \
199 while (ch > rp1->end) \
200 ++rp1; \
201 \
202 /* Use the UCS4 table for single byte. */ \
203 unsigned char sbconv; \
204 if (__builtin_expect (ch < rp1->start, 0) \
205 || (sbconv = __ucs4_to_ibm933sb[ch + rp1->idx], \
206 __builtin_expect (sbconv, L'\1') == L'\0' && ch != '\0')) \
207 { \
208 /* Use the UCS4 table for double byte. */ \
209 while (ch > rp2->end) \
210 ++rp2; \
211 \
212 const char *cp; \
213 if (__builtin_expect (ch < rp2->start, 0) \
214 || (cp = __ucs4_to_ibm933db[ch + rp2->idx], \
215 __builtin_expect (cp[0], L'\1')==L'\0' && ch != '\0')) \
216 { \
217 /* This is an illegal character. */ \
218 STANDARD_TO_LOOP_ERR_HANDLER (4); \
219 } \
220 else \
221 { \
222 if (curcs == sb) \
223 { \
224 if (__glibc_unlikely (outptr + 1 > outend)) \
225 { \
226 result = __GCONV_FULL_OUTPUT; \
227 break; \
228 } \
229 *outptr++ = SO; \
230 curcs = db; \
231 } \
232 \
233 if (__glibc_unlikely (outptr + 2 > outend)) \
234 { \
235 result = __GCONV_FULL_OUTPUT; \
236 break; \
237 } \
238 *outptr++ = cp[0]; \
239 *outptr++ = cp[1]; \
240 } \
241 } \
242 else \
243 { \
244 if (curcs == db) \
245 { \
246 if (__glibc_unlikely (outptr + 1 > outend)) \
247 { \
248 result = __GCONV_FULL_OUTPUT; \
249 break; \
250 } \
251 *outptr++ = SI; \
252 curcs = sb; \
253 } \
254 \
255 if (__glibc_unlikely (outptr + 1 > outend)) \
256 { \
257 result = __GCONV_FULL_OUTPUT; \
258 break; \
259 } \
260 *outptr++ = sbconv; \
261 } \
262 \
263 /* Now that we wrote the output increment the input pointer. */ \
264 inptr += 4; \
265 }
266 #define LOOP_NEED_FLAGS
267 #define EXTRA_LOOP_DECLS , int *curcsp
268 #define INIT_PARAMS int curcs = *curcsp & ~7
269 #define REINIT_PARAMS curcs = *curcsp & ~7
270 #define UPDATE_PARAMS *curcsp = curcs
271 #include <iconv/loop.c>
272
273 /* Now define the toplevel functions. */
274 #include <iconv/skeleton.c>