The Design and Implementation of the FreeBSD Operating System, Second Edition
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FreeBSD/Linux Kernel Cross Reference
sys/libkern/iconv_xlat16.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
    3  *
    4  * Copyright (c) 2003, 2005 Ryuichiro Imura
    5  * All rights reserved.
    6  *
    7  * Redistribution and use in source and binary forms, with or without
    8  * modification, are permitted provided that the following conditions
    9  * are met:
   10  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  *
   16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   26  * SUCH DAMAGE.
   27  */
   28 
   29 #include <sys/cdefs.h>
   30 __FBSDID("$FreeBSD: head/sys/libkern/iconv_xlat16.c 326271 2017-11-27 15:20:12Z pfg $");
   31 
   32 #include <sys/param.h>
   33 #include <sys/kernel.h>
   34 #include <sys/systm.h>
   35 #include <sys/malloc.h>
   36 #include <sys/iconv.h>
   37 
   38 #include "iconv_converter_if.h"
   39 
   40 /*
   41  * "XLAT16" converter
   42  */
   43 
   44 #ifdef MODULE_DEPEND
   45 MODULE_DEPEND(iconv_xlat16, libiconv, 2, 2, 2);
   46 #endif
   47 
   48 #define C2I1(c) ((c) & 0x8000 ? ((c) & 0xff) | 0x100 : (c) & 0xff)
   49 #define C2I2(c) ((c) & 0x8000 ? ((c) >> 8) & 0x7f : ((c) >> 8) & 0xff)
   50 
   51 /*
   52  * XLAT16 converter instance
   53  */
   54 struct iconv_xlat16 {
   55         KOBJ_FIELDS;
   56         uint32_t *              d_table[0x200];
   57         void *                  f_ctp;
   58         void *                  t_ctp;
   59         struct iconv_cspair *   d_csp;
   60 };
   61 
   62 static int
   63 iconv_xlat16_open(struct iconv_converter_class *dcp,
   64         struct iconv_cspair *csp, struct iconv_cspair *cspf, void **dpp)
   65 {
   66         struct iconv_xlat16 *dp;
   67         uint32_t *headp, **idxp;
   68         int i;
   69 
   70         dp = (struct iconv_xlat16 *)kobj_create((struct kobj_class*)dcp, M_ICONV, M_WAITOK);
   71         headp = (uint32_t *)((caddr_t)csp->cp_data + sizeof(dp->d_table));
   72         idxp = (uint32_t **)csp->cp_data;
   73         for (i = 0 ; i < 0x200 ; i++) {
   74                 if (*idxp) {
   75                         dp->d_table[i] = headp;
   76                         headp += 0x80;
   77                 } else {
   78                         dp->d_table[i] = NULL;
   79                 }
   80                 idxp++;
   81         }
   82 
   83         if (strcmp(csp->cp_to, KICONV_WCTYPE_NAME) != 0) {
   84                 if (iconv_open(KICONV_WCTYPE_NAME, csp->cp_from, &dp->f_ctp) != 0)
   85                         dp->f_ctp = NULL;
   86                 if (iconv_open(KICONV_WCTYPE_NAME, csp->cp_to, &dp->t_ctp) != 0)
   87                         dp->t_ctp = NULL;
   88         } else {
   89                 dp->f_ctp = dp->t_ctp = dp;
   90         }
   91 
   92         dp->d_csp = csp;
   93         csp->cp_refcount++;
   94         *dpp = (void*)dp;
   95         return (0);
   96 }
   97 
   98 static int
   99 iconv_xlat16_close(void *data)
  100 {
  101         struct iconv_xlat16 *dp = data;
  102 
  103         if (dp->f_ctp && dp->f_ctp != data)
  104                 iconv_close(dp->f_ctp);
  105         if (dp->t_ctp && dp->t_ctp != data)
  106                 iconv_close(dp->t_ctp);
  107         dp->d_csp->cp_refcount--;
  108         kobj_delete((struct kobj*)data, M_ICONV);
  109         return (0);
  110 }
  111 
  112 static int
  113 iconv_xlat16_conv(void *d2p, const char **inbuf,
  114         size_t *inbytesleft, char **outbuf, size_t *outbytesleft,
  115         int convchar, int casetype)
  116 {
  117         struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p;
  118         const char *src;
  119         char *dst;
  120         int nullin, ret = 0;
  121         size_t in, on, ir, or, inlen;
  122         uint32_t code;
  123         u_char u, l;
  124         uint16_t c1, c2, ctmp;
  125 
  126         if (inbuf == NULL || *inbuf == NULL || outbuf == NULL || *outbuf == NULL)
  127                 return (0);
  128         ir = in = *inbytesleft;
  129         or = on = *outbytesleft;
  130         src = *inbuf;
  131         dst = *outbuf;
  132 
  133         while(ir > 0 && or > 0) {
  134 
  135                 inlen = 0;
  136                 code = 0;
  137 
  138                 c1 = ir > 1 ? *(src+1) & 0xff : 0;
  139                 c2 = *src & 0xff;
  140                 ctmp = 0;
  141 
  142                 c1 = c2 & 0x80 ? c1 | 0x100 : c1;
  143                 c2 = c2 & 0x80 ? c2 & 0x7f : c2;
  144 
  145                 if (ir > 1 && dp->d_table[c1] && dp->d_table[c1][c2]) {
  146                         /*
  147                          * inbuf char is a double byte char
  148                          */
  149                         inlen = 2;
  150 
  151                         /* toupper,tolower */
  152                         if (casetype == KICONV_FROM_LOWER && dp->f_ctp)
  153                                 ctmp = towlower(((u_char)*src << 8) | (u_char)*(src + 1),
  154                                     dp->f_ctp);
  155                         else if (casetype == KICONV_FROM_UPPER && dp->f_ctp)
  156                                 ctmp = towupper(((u_char)*src << 8) | (u_char)*(src + 1),
  157                                     dp->f_ctp);
  158                         if (ctmp) {
  159                                 c1 = C2I1(ctmp);
  160                                 c2 = C2I2(ctmp);
  161                         }
  162                 }
  163 
  164                 if (inlen == 0) {
  165                         c1 &= 0xff00;
  166                         if (!dp->d_table[c1]) {
  167                                 ret = -1;
  168                                 break;
  169                         }
  170                         /*
  171                          * inbuf char is a single byte char
  172                          */
  173                         inlen = 1;
  174 
  175                         if (casetype & (KICONV_FROM_LOWER|KICONV_FROM_UPPER))
  176                                 code = dp->d_table[c1][c2];
  177 
  178                         if (casetype == KICONV_FROM_LOWER) {
  179                                 if (dp->f_ctp)
  180                                         ctmp = towlower((u_char)*src, dp->f_ctp);
  181                                 else if (code & XLAT16_HAS_FROM_LOWER_CASE)
  182                                         ctmp = (u_char)(code >> 16);
  183                         } else if (casetype == KICONV_FROM_UPPER) {
  184                                 if (dp->f_ctp)
  185                                         ctmp = towupper((u_char)*src, dp->f_ctp);
  186                                 else if (code & XLAT16_HAS_FROM_UPPER_CASE)
  187                                         ctmp = (u_char)(code >> 16);
  188                         }
  189                         if (ctmp) {
  190                                 c1 = C2I1(ctmp << 8);
  191                                 c2 = C2I2(ctmp << 8);
  192                         }
  193                 }
  194 
  195                 code = dp->d_table[c1][c2];
  196                 if (!code) {
  197                         ret = -1;
  198                         break;
  199                 }
  200 
  201                 nullin = (code & XLAT16_ACCEPT_NULL_IN) ? 1 : 0;
  202                 if (inlen == 1 && nullin) {
  203                         /*
  204                          * XLAT16_ACCEPT_NULL_IN requires inbuf has 2byte
  205                          */
  206                         ret = -1;
  207                         break;
  208                 }
  209 
  210                 /*
  211                  * now start translation
  212                  */
  213                 u = (u_char)(code >> 8);
  214                 l = (u_char)code;
  215 
  216 #ifdef XLAT16_ACCEPT_3BYTE_CHR
  217                 if (code & XLAT16_IS_3BYTE_CHR) {
  218                         if (or < 3) {
  219                                 ret = -1;
  220                                 break;
  221                         }
  222                         *dst++ = u;
  223                         *dst++ = l;
  224                         *dst++ = (u_char)(code >> 16);
  225                         or -= 3;
  226                 } else
  227 #endif
  228                 if (u || code & XLAT16_ACCEPT_NULL_OUT) {
  229                         if (or < 2) {
  230                                 ret = -1;
  231                                 break;
  232                         }
  233 
  234                         /* toupper,tolower */
  235                         if (casetype == KICONV_LOWER && dp->t_ctp) {
  236                                 code = towlower((uint16_t)code, dp->t_ctp);
  237                                 u = (u_char)(code >> 8);
  238                                 l = (u_char)code;
  239                         }
  240                         if (casetype == KICONV_UPPER && dp->t_ctp) {
  241                                 code = towupper((uint16_t)code, dp->t_ctp);
  242                                 u = (u_char)(code >> 8);
  243                                 l = (u_char)code;
  244                         }
  245 
  246                         *dst++ = u;
  247                         *dst++ = l;
  248                         or -= 2;
  249                 } else {
  250                         /* toupper,tolower */
  251                         if (casetype == KICONV_LOWER) {
  252                                 if (dp->t_ctp)
  253                                         l = (u_char)towlower(l, dp->t_ctp);
  254                                 else if (code & XLAT16_HAS_LOWER_CASE)
  255                                         l = (u_char)(code >> 16);
  256                         }
  257                         if (casetype == KICONV_UPPER) {
  258                                 if (dp->t_ctp)
  259                                         l = (u_char)towupper(l, dp->t_ctp);
  260                                 else if (code & XLAT16_HAS_UPPER_CASE)
  261                                         l = (u_char)(code >> 16);
  262                         }
  263 
  264                         *dst++ = l;
  265                         or--;
  266                 }
  267 
  268                 if (inlen == 2) {
  269                         /*
  270                          * there is a case that inbuf char is a single
  271                          * byte char while inlen == 2
  272                          */
  273                         if ((u_char)*(src+1) == '\0' && !nullin ) {
  274                                 src++;
  275                                 ir--;
  276                         } else {
  277                                 src += 2;
  278                                 ir -= 2;
  279                         }
  280                 } else {
  281                         src++;
  282                         ir--;
  283                 }
  284 
  285                 if (convchar == 1)
  286                         break;
  287         }
  288 
  289         *inbuf += in - ir;
  290         *outbuf += on - or;
  291         *inbytesleft -= in - ir;
  292         *outbytesleft -= on - or;
  293         return (ret);
  294 }
  295 
  296 static const char *
  297 iconv_xlat16_name(struct iconv_converter_class *dcp)
  298 {
  299         return ("xlat16");
  300 }
  301 
  302 static int
  303 iconv_xlat16_tolower(void *d2p, int c)
  304 {
  305         struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p;
  306         int c1, c2, out;
  307 
  308         if (c < 0x100) {
  309                 c1 = C2I1(c << 8);
  310                 c2 = C2I2(c << 8);
  311         } else if (c < 0x10000) {
  312                 c1 = C2I1(c);
  313                 c2 = C2I2(c);
  314         } else
  315                 return (c);
  316 
  317         if (dp->d_table[c1] && dp->d_table[c1][c2] & XLAT16_HAS_LOWER_CASE) {
  318                 /*return (int)(dp->d_table[c1][c2] & 0xffff);*/
  319                 out = dp->d_table[c1][c2] & 0xffff;
  320                 if ((out & 0xff) == 0)
  321                         out = (out >> 8) & 0xff;
  322                 return (out);
  323         } else
  324                 return (c);
  325 }
  326 
  327 static int
  328 iconv_xlat16_toupper(void *d2p, int c)
  329 {
  330         struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p;
  331         int c1, c2, out;
  332 
  333         if (c < 0x100) {
  334                 c1 = C2I1(c << 8);
  335                 c2 = C2I2(c << 8);
  336         } else if (c < 0x10000) {
  337                 c1 = C2I1(c);
  338                 c2 = C2I2(c);
  339         } else
  340                 return (c);
  341 
  342         if (dp->d_table[c1] && dp->d_table[c1][c2] & XLAT16_HAS_UPPER_CASE) {
  343                 out = dp->d_table[c1][c2] & 0xffff;
  344                 if ((out & 0xff) == 0)
  345                         out = (out >> 8) & 0xff;
  346                 return (out);
  347         } else
  348                 return (c);
  349 }
  350 
  351 static kobj_method_t iconv_xlat16_methods[] = {
  352         KOBJMETHOD(iconv_converter_open,        iconv_xlat16_open),
  353         KOBJMETHOD(iconv_converter_close,       iconv_xlat16_close),
  354         KOBJMETHOD(iconv_converter_conv,        iconv_xlat16_conv),
  355 #if 0
  356         KOBJMETHOD(iconv_converter_init,        iconv_xlat16_init),
  357         KOBJMETHOD(iconv_converter_done,        iconv_xlat16_done),
  358 #endif
  359         KOBJMETHOD(iconv_converter_name,        iconv_xlat16_name),
  360         KOBJMETHOD(iconv_converter_tolower,     iconv_xlat16_tolower),
  361         KOBJMETHOD(iconv_converter_toupper,     iconv_xlat16_toupper),
  362         {0, 0}
  363 };
  364 
  365 KICONV_CONVERTER(xlat16, sizeof(struct iconv_xlat16));

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