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 * $FreeBSD: src/sys/libkern/iconv_xlat16.c,v 1.3.20.1 2009/04/15 03:14:26 kensmith Exp $ 27 */ 28 29 #include <sys/param.h> 30 #include <sys/kernel.h> 31 #include <sys/systm.h> 32 #include <sys/malloc.h> 33 #include <sys/iconv.h> 34 35 #include "iconv_converter_if.h" 36 37 /* 38 * "XLAT16" converter 39 */ 40 41 #ifdef MODULE_DEPEND 42 MODULE_DEPEND(iconv_xlat16, libiconv, 2, 2, 2); 43 #endif 44 45 /* 46 * XLAT16 converter instance 47 */ 48 struct iconv_xlat16 { 49 KOBJ_FIELDS; 50 uint32_t * d_table[0x200]; 51 struct iconv_cspair * d_csp; 52 }; 53 54 static int 55 iconv_xlat16_open(struct iconv_converter_class *dcp, 56 struct iconv_cspair *csp, struct iconv_cspair *cspf, void **dpp) 57 { 58 struct iconv_xlat16 *dp; 59 uint32_t *headp, **idxp; 60 int i; 61 62 dp = (struct iconv_xlat16 *)kobj_create((struct kobj_class*)dcp, M_ICONV, M_WAITOK); 63 headp = (uint32_t *)((caddr_t)csp->cp_data + sizeof(dp->d_table)); 64 idxp = (uint32_t **)csp->cp_data; 65 for (i = 0 ; i < 0x200 ; i++) { 66 if (*idxp) { 67 dp->d_table[i] = headp; 68 headp += 0x80; 69 } else { 70 dp->d_table[i] = NULL; 71 } 72 idxp++; 73 } 74 dp->d_csp = csp; 75 csp->cp_refcount++; 76 *dpp = (void*)dp; 77 return (0); 78 } 79 80 static int 81 iconv_xlat16_close(void *data) 82 { 83 struct iconv_xlat16 *dp = data; 84 85 dp->d_csp->cp_refcount--; 86 kobj_delete((struct kobj*)data, M_ICONV); 87 return (0); 88 } 89 90 static int 91 iconv_xlat16_conv(void *d2p, const char **inbuf, 92 size_t *inbytesleft, char **outbuf, size_t *outbytesleft, 93 int convchar, int casetype) 94 { 95 struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p; 96 const char *src; 97 char *dst; 98 int nullin, ret = 0; 99 size_t in, on, ir, or, inlen; 100 uint32_t code; 101 u_char u, l; 102 uint16_t c1, c2; 103 104 if (inbuf == NULL || *inbuf == NULL || outbuf == NULL || *outbuf == NULL) 105 return (0); 106 ir = in = *inbytesleft; 107 or = on = *outbytesleft; 108 src = *inbuf; 109 dst = *outbuf; 110 111 while(ir > 0 && or > 0) { 112 113 inlen = 0; 114 code = '\0'; 115 116 c1 = ir > 1 ? *(src+1) & 0xff : 0; 117 c2 = *src & 0xff; 118 119 c1 = c2 & 0x80 ? c1 | 0x100 : c1; 120 c2 = c2 & 0x80 ? c2 & 0x7f : c2; 121 122 if (ir > 1 && dp->d_table[c1]) { 123 /* 124 * inbuf char is a double byte char 125 */ 126 code = dp->d_table[c1][c2]; 127 if (code) 128 inlen = 2; 129 } 130 131 if (inlen == 0) { 132 c1 &= 0xff00; 133 if (!dp->d_table[c1]) { 134 ret = -1; 135 break; 136 } 137 /* 138 * inbuf char is a single byte char 139 */ 140 inlen = 1; 141 code = dp->d_table[c1][c2]; 142 if (!code) { 143 ret = -1; 144 break; 145 } 146 } 147 148 nullin = (code & XLAT16_ACCEPT_NULL_IN) ? 1 : 0; 149 if (inlen == 1 && nullin) { 150 /* 151 * XLAT16_ACCEPT_NULL_IN requires inbuf has 2byte 152 */ 153 ret = -1; 154 break; 155 } 156 157 /* 158 * now start translation 159 */ 160 if ((casetype == KICONV_FROM_LOWER && code & XLAT16_HAS_FROM_LOWER_CASE) || 161 (casetype == KICONV_FROM_UPPER && code & XLAT16_HAS_FROM_UPPER_CASE)) { 162 c2 = (u_char)(code >> 16); 163 c1 = c2 & 0x80 ? 0x100 : 0; 164 c2 = c2 & 0x80 ? c2 & 0x7f : c2; 165 code = dp->d_table[c1][c2]; 166 } 167 168 u = (u_char)(code >> 8); 169 l = (u_char)code; 170 171 #ifdef XLAT16_ACCEPT_3BYTE_CHR 172 if (code & XLAT16_IS_3BYTE_CHR) { 173 if (or < 3) { 174 ret = -1; 175 break; 176 } 177 *dst++ = u; 178 *dst++ = l; 179 *dst++ = (u_char)(code >> 16); 180 or -= 3; 181 } else 182 #endif 183 if (u || code & XLAT16_ACCEPT_NULL_OUT) { 184 if (or < 2) { 185 ret = -1; 186 break; 187 } 188 *dst++ = u; 189 *dst++ = l; 190 or -= 2; 191 } else { 192 if ((casetype == KICONV_LOWER && code & XLAT16_HAS_LOWER_CASE) || 193 (casetype == KICONV_UPPER && code & XLAT16_HAS_UPPER_CASE)) 194 *dst++ = (u_char)(code >> 16); 195 else 196 *dst++ = l; 197 or--; 198 } 199 200 if (inlen == 2) { 201 /* 202 * there is a case that inbuf char is a single 203 * byte char while inlen == 2 204 */ 205 if ((u_char)*(src+1) == 0 && !nullin ) { 206 src++; 207 ir--; 208 } else { 209 src += 2; 210 ir -= 2; 211 } 212 } else { 213 src++; 214 ir--; 215 } 216 217 if (convchar == 1) 218 break; 219 } 220 221 *inbuf += in - ir; 222 *outbuf += on - or; 223 *inbytesleft -= in - ir; 224 *outbytesleft -= on - or; 225 return (ret); 226 } 227 228 static const char * 229 iconv_xlat16_name(struct iconv_converter_class *dcp) 230 { 231 return ("xlat16"); 232 } 233 234 static kobj_method_t iconv_xlat16_methods[] = { 235 KOBJMETHOD(iconv_converter_open, iconv_xlat16_open), 236 KOBJMETHOD(iconv_converter_close, iconv_xlat16_close), 237 KOBJMETHOD(iconv_converter_conv, iconv_xlat16_conv), 238 #if 0 239 KOBJMETHOD(iconv_converter_init, iconv_xlat16_init), 240 KOBJMETHOD(iconv_converter_done, iconv_xlat16_done), 241 #endif 242 KOBJMETHOD(iconv_converter_name, iconv_xlat16_name), 243 {0, 0} 244 }; 245 246 KICONV_CONVERTER(xlat16, sizeof(struct iconv_xlat16)); 247