sys/libkern/iconv_xlat16.c

   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("$FreeBSD$");
  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));