1 /*-
2 * Copyright (c) 2003, Ryuichiro Imura
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27 #include <sys/cdefs.h>
28 __FBSDID("$FreeBSD: src/sys/libkern/iconv_xlat16.c,v 1.3 2005/05/24 15:38:08 imura Exp $");
29
30 #include <sys/param.h>
31 #include <sys/kernel.h>
32 #include <sys/systm.h>
33 #include <sys/malloc.h>
34 #include <sys/iconv.h>
35
36 #include "iconv_converter_if.h"
37
38 /*
39 * "XLAT16" converter
40 */
41
42 #ifdef MODULE_DEPEND
43 MODULE_DEPEND(iconv_xlat16, libiconv, 2, 2, 2);
44 #endif
45
46 /*
47 * XLAT16 converter instance
48 */
49 struct iconv_xlat16 {
50 KOBJ_FIELDS;
51 uint32_t * d_table[0x200];
52 struct iconv_cspair * d_csp;
53 };
54
55 static int
56 iconv_xlat16_open(struct iconv_converter_class *dcp,
57 struct iconv_cspair *csp, struct iconv_cspair *cspf, void **dpp)
58 {
59 struct iconv_xlat16 *dp;
60 uint32_t *headp, **idxp;
61 int i;
62
63 dp = (struct iconv_xlat16 *)kobj_create((struct kobj_class*)dcp, M_ICONV, M_WAITOK);
64 headp = (uint32_t *)((caddr_t)csp->cp_data + sizeof(dp->d_table));
65 idxp = (uint32_t **)csp->cp_data;
66 for (i = 0 ; i < 0x200 ; i++) {
67 if (*idxp) {
68 dp->d_table[i] = headp;
69 headp += 0x80;
70 } else {
71 dp->d_table[i] = NULL;
72 }
73 idxp++;
74 }
75 dp->d_csp = csp;
76 csp->cp_refcount++;
77 *dpp = (void*)dp;
78 return (0);
79 }
80
81 static int
82 iconv_xlat16_close(void *data)
83 {
84 struct iconv_xlat16 *dp = data;
85
86 dp->d_csp->cp_refcount--;
87 kobj_delete((struct kobj*)data, M_ICONV);
88 return (0);
89 }
90
91 static int
92 iconv_xlat16_conv(void *d2p, const char **inbuf,
93 size_t *inbytesleft, char **outbuf, size_t *outbytesleft,
94 int convchar, int casetype)
95 {
96 struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p;
97 const char *src;
98 char *dst;
99 int nullin, ret = 0;
100 size_t in, on, ir, or, inlen;
101 uint32_t code;
102 u_char u, l;
103 uint16_t c1, c2;
104
105 if (inbuf == NULL || *inbuf == NULL || outbuf == NULL || *outbuf == NULL)
106 return (0);
107 ir = in = *inbytesleft;
108 or = on = *outbytesleft;
109 src = *inbuf;
110 dst = *outbuf;
111
112 while(ir > 0 && or > 0) {
113
114 inlen = 0;
115 code = '\0';
116
117 c1 = ir > 1 ? *(src+1) & 0xff : 0;
118 c2 = *src & 0xff;
119
120 c1 = c2 & 0x80 ? c1 | 0x100 : c1;
121 c2 = c2 & 0x80 ? c2 & 0x7f : c2;
122
123 if (ir > 1 && dp->d_table[c1]) {
124 /*
125 * inbuf char is a double byte char
126 */
127 code = dp->d_table[c1][c2];
128 if (code)
129 inlen = 2;
130 }
131
132 if (inlen == 0) {
133 c1 &= 0xff00;
134 if (!dp->d_table[c1]) {
135 ret = -1;
136 break;
137 }
138 /*
139 * inbuf char is a single byte char
140 */
141 inlen = 1;
142 code = dp->d_table[c1][c2];
143 if (!code) {
144 ret = -1;
145 break;
146 }
147 }
148
149 nullin = (code & XLAT16_ACCEPT_NULL_IN) ? 1 : 0;
150 if (inlen == 1 && nullin) {
151 /*
152 * XLAT16_ACCEPT_NULL_IN requires inbuf has 2byte
153 */
154 ret = -1;
155 break;
156 }
157
158 /*
159 * now start translation
160 */
161 if ((casetype == KICONV_FROM_LOWER && code & XLAT16_HAS_FROM_LOWER_CASE) ||
162 (casetype == KICONV_FROM_UPPER && code & XLAT16_HAS_FROM_UPPER_CASE)) {
163 c2 = (u_char)(code >> 16);
164 c1 = c2 & 0x80 ? 0x100 : 0;
165 c2 = c2 & 0x80 ? c2 & 0x7f : c2;
166 code = dp->d_table[c1][c2];
167 }
168
169 u = (u_char)(code >> 8);
170 l = (u_char)code;
171
172 #ifdef XLAT16_ACCEPT_3BYTE_CHR
173 if (code & XLAT16_IS_3BYTE_CHR) {
174 if (or < 3) {
175 ret = -1;
176 break;
177 }
178 *dst++ = u;
179 *dst++ = l;
180 *dst++ = (u_char)(code >> 16);
181 or -= 3;
182 } else
183 #endif
184 if (u || code & XLAT16_ACCEPT_NULL_OUT) {
185 if (or < 2) {
186 ret = -1;
187 break;
188 }
189 *dst++ = u;
190 *dst++ = l;
191 or -= 2;
192 } else {
193 if ((casetype == KICONV_LOWER && code & XLAT16_HAS_LOWER_CASE) ||
194 (casetype == KICONV_UPPER && code & XLAT16_HAS_UPPER_CASE))
195 *dst++ = (u_char)(code >> 16);
196 else
197 *dst++ = l;
198 or--;
199 }
200
201 if (inlen == 2) {
202 /*
203 * there is a case that inbuf char is a single
204 * byte char while inlen == 2
205 */
206 if ((u_char)*(src+1) == 0 && !nullin ) {
207 src++;
208 ir--;
209 } else {
210 src += 2;
211 ir -= 2;
212 }
213 } else {
214 src++;
215 ir--;
216 }
217
218 if (convchar == 1)
219 break;
220 }
221
222 *inbuf += in - ir;
223 *outbuf += on - or;
224 *inbytesleft -= in - ir;
225 *outbytesleft -= on - or;
226 return (ret);
227 }
228
229 static const char *
230 iconv_xlat16_name(struct iconv_converter_class *dcp)
231 {
232 return ("xlat16");
233 }
234
235 static kobj_method_t iconv_xlat16_methods[] = {
236 KOBJMETHOD(iconv_converter_open, iconv_xlat16_open),
237 KOBJMETHOD(iconv_converter_close, iconv_xlat16_close),
238 KOBJMETHOD(iconv_converter_conv, iconv_xlat16_conv),
239 #if 0
240 KOBJMETHOD(iconv_converter_init, iconv_xlat16_init),
241 KOBJMETHOD(iconv_converter_done, iconv_xlat16_done),
242 #endif
243 KOBJMETHOD(iconv_converter_name, iconv_xlat16_name),
244 {0, 0}
245 };
246
247 KICONV_CONVERTER(xlat16, sizeof(struct iconv_xlat16));
248
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