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  * Copyright (c) 2003, 2005 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: releng/10.3/sys/libkern/iconv_xlat16.c 194638 2009-06-22 17:09:46Z delphij $");
   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 #define C2I1(c) ((c) & 0x8000 ? ((c) & 0xff) | 0x100 : (c) & 0xff)
   47 #define C2I2(c) ((c) & 0x8000 ? ((c) >> 8) & 0x7f : ((c) >> 8) & 0xff)
   48 
   49 /*
   50  * XLAT16 converter instance
   51  */
   52 struct iconv_xlat16 {
   53         KOBJ_FIELDS;
   54         uint32_t *              d_table[0x200];
   55         void *                  f_ctp;
   56         void *                  t_ctp;
   57         struct iconv_cspair *   d_csp;
   58 };
   59 
   60 static int
   61 iconv_xlat16_open(struct iconv_converter_class *dcp,
   62         struct iconv_cspair *csp, struct iconv_cspair *cspf, void **dpp)
   63 {
   64         struct iconv_xlat16 *dp;
   65         uint32_t *headp, **idxp;
   66         int i;
   67 
   68         dp = (struct iconv_xlat16 *)kobj_create((struct kobj_class*)dcp, M_ICONV, M_WAITOK);
   69         headp = (uint32_t *)((caddr_t)csp->cp_data + sizeof(dp->d_table));
   70         idxp = (uint32_t **)csp->cp_data;
   71         for (i = 0 ; i < 0x200 ; i++) {
   72                 if (*idxp) {
   73                         dp->d_table[i] = headp;
   74                         headp += 0x80;
   75                 } else {
   76                         dp->d_table[i] = NULL;
   77                 }
   78                 idxp++;
   79         }
   80 
   81         if (strcmp(csp->cp_to, KICONV_WCTYPE_NAME) != 0) {
   82                 if (iconv_open(KICONV_WCTYPE_NAME, csp->cp_from, &dp->f_ctp) != 0)
   83                         dp->f_ctp = NULL;
   84                 if (iconv_open(KICONV_WCTYPE_NAME, csp->cp_to, &dp->t_ctp) != 0)
   85                         dp->t_ctp = NULL;
   86         } else {
   87                 dp->f_ctp = dp->t_ctp = dp;
   88         }
   89 
   90         dp->d_csp = csp;
   91         csp->cp_refcount++;
   92         *dpp = (void*)dp;
   93         return (0);
   94 }
   95 
   96 static int
   97 iconv_xlat16_close(void *data)
   98 {
   99         struct iconv_xlat16 *dp = data;
  100 
  101         if (dp->f_ctp && dp->f_ctp != data)
  102                 iconv_close(dp->f_ctp);
  103         if (dp->t_ctp && dp->t_ctp != data)
  104                 iconv_close(dp->t_ctp);
  105         dp->d_csp->cp_refcount--;
  106         kobj_delete((struct kobj*)data, M_ICONV);
  107         return (0);
  108 }
  109 
  110 static int
  111 iconv_xlat16_conv(void *d2p, const char **inbuf,
  112         size_t *inbytesleft, char **outbuf, size_t *outbytesleft,
  113         int convchar, int casetype)
  114 {
  115         struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p;
  116         const char *src;
  117         char *dst;
  118         int nullin, ret = 0;
  119         size_t in, on, ir, or, inlen;
  120         uint32_t code;
  121         u_char u, l;
  122         uint16_t c1, c2, ctmp;
  123 
  124         if (inbuf == NULL || *inbuf == NULL || outbuf == NULL || *outbuf == NULL)
  125                 return (0);
  126         ir = in = *inbytesleft;
  127         or = on = *outbytesleft;
  128         src = *inbuf;
  129         dst = *outbuf;
  130 
  131         while(ir > 0 && or > 0) {
  132 
  133                 inlen = 0;
  134                 code = 0;
  135 
  136                 c1 = ir > 1 ? *(src+1) & 0xff : 0;
  137                 c2 = *src & 0xff;
  138                 ctmp = 0;
  139 
  140                 c1 = c2 & 0x80 ? c1 | 0x100 : c1;
  141                 c2 = c2 & 0x80 ? c2 & 0x7f : c2;
  142 
  143                 if (ir > 1 && dp->d_table[c1] && dp->d_table[c1][c2]) {
  144                         /*
  145                          * inbuf char is a double byte char
  146                          */
  147                         inlen = 2;
  148 
  149                         /* toupper,tolower */
  150                         if (casetype == KICONV_FROM_LOWER && dp->f_ctp)
  151                                 ctmp = towlower(((u_char)*src << 8) | (u_char)*(src + 1),
  152                                     dp->f_ctp);
  153                         else if (casetype == KICONV_FROM_UPPER && dp->f_ctp)
  154                                 ctmp = towupper(((u_char)*src << 8) | (u_char)*(src + 1),
  155                                     dp->f_ctp);
  156                         if (ctmp) {
  157                                 c1 = C2I1(ctmp);
  158                                 c2 = C2I2(ctmp);
  159                         }
  160                 }
  161 
  162                 if (inlen == 0) {
  163                         c1 &= 0xff00;
  164                         if (!dp->d_table[c1]) {
  165                                 ret = -1;
  166                                 break;
  167                         }
  168                         /*
  169                          * inbuf char is a single byte char
  170                          */
  171                         inlen = 1;
  172 
  173                         if (casetype & (KICONV_FROM_LOWER|KICONV_FROM_UPPER))
  174                                 code = dp->d_table[c1][c2];
  175 
  176                         if (casetype == KICONV_FROM_LOWER) {
  177                                 if (dp->f_ctp)
  178                                         ctmp = towlower((u_char)*src, dp->f_ctp);
  179                                 else if (code & XLAT16_HAS_FROM_LOWER_CASE)
  180                                         ctmp = (u_char)(code >> 16);
  181                         } else if (casetype == KICONV_FROM_UPPER) {
  182                                 if (dp->f_ctp)
  183                                         ctmp = towupper((u_char)*src, dp->f_ctp);
  184                                 else if (code & XLAT16_HAS_FROM_UPPER_CASE)
  185                                         ctmp = (u_char)(code >> 16);
  186                         }
  187                         if (ctmp) {
  188                                 c1 = C2I1(ctmp << 8);
  189                                 c2 = C2I2(ctmp << 8);
  190                         }
  191                 }
  192 
  193                 code = dp->d_table[c1][c2];
  194                 if (!code) {
  195                         ret = -1;
  196                         break;
  197                 }
  198 
  199                 nullin = (code & XLAT16_ACCEPT_NULL_IN) ? 1 : 0;
  200                 if (inlen == 1 && nullin) {
  201                         /*
  202                          * XLAT16_ACCEPT_NULL_IN requires inbuf has 2byte
  203                          */
  204                         ret = -1;
  205                         break;
  206                 }
  207 
  208                 /*
  209                  * now start translation
  210                  */
  211                 u = (u_char)(code >> 8);
  212                 l = (u_char)code;
  213 
  214 #ifdef XLAT16_ACCEPT_3BYTE_CHR
  215                 if (code & XLAT16_IS_3BYTE_CHR) {
  216                         if (or < 3) {
  217                                 ret = -1;
  218                                 break;
  219                         }
  220                         *dst++ = u;
  221                         *dst++ = l;
  222                         *dst++ = (u_char)(code >> 16);
  223                         or -= 3;
  224                 } else
  225 #endif
  226                 if (u || code & XLAT16_ACCEPT_NULL_OUT) {
  227                         if (or < 2) {
  228                                 ret = -1;
  229                                 break;
  230                         }
  231 
  232                         /* toupper,tolower */
  233                         if (casetype == KICONV_LOWER && dp->t_ctp) {
  234                                 code = towlower((uint16_t)code, dp->t_ctp);
  235                                 u = (u_char)(code >> 8);
  236                                 l = (u_char)code;
  237                         }
  238                         if (casetype == KICONV_UPPER && dp->t_ctp) {
  239                                 code = towupper((uint16_t)code, dp->t_ctp);
  240                                 u = (u_char)(code >> 8);
  241                                 l = (u_char)code;
  242                         }
  243 
  244                         *dst++ = u;
  245                         *dst++ = l;
  246                         or -= 2;
  247                 } else {
  248                         /* toupper,tolower */
  249                         if (casetype == KICONV_LOWER) {
  250                                 if (dp->t_ctp)
  251                                         l = (u_char)towlower(l, dp->t_ctp);
  252                                 else if (code & XLAT16_HAS_LOWER_CASE)
  253                                         l = (u_char)(code >> 16);
  254                         }
  255                         if (casetype == KICONV_UPPER) {
  256                                 if (dp->t_ctp)
  257                                         l = (u_char)towupper(l, dp->t_ctp);
  258                                 else if (code & XLAT16_HAS_UPPER_CASE)
  259                                         l = (u_char)(code >> 16);
  260                         }
  261 
  262                         *dst++ = l;
  263                         or--;
  264                 }
  265 
  266                 if (inlen == 2) {
  267                         /*
  268                          * there is a case that inbuf char is a single
  269                          * byte char while inlen == 2
  270                          */
  271                         if ((u_char)*(src+1) == 0 && !nullin ) {
  272                                 src++;
  273                                 ir--;
  274                         } else {
  275                                 src += 2;
  276                                 ir -= 2;
  277                         }
  278                 } else {
  279                         src++;
  280                         ir--;
  281                 }
  282 
  283                 if (convchar == 1)
  284                         break;
  285         }
  286 
  287         *inbuf += in - ir;
  288         *outbuf += on - or;
  289         *inbytesleft -= in - ir;
  290         *outbytesleft -= on - or;
  291         return (ret);
  292 }
  293 
  294 static const char *
  295 iconv_xlat16_name(struct iconv_converter_class *dcp)
  296 {
  297         return ("xlat16");
  298 }
  299 
  300 static int
  301 iconv_xlat16_tolower(void *d2p, register int c)
  302 {
  303         struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p;
  304         register int c1, c2, out;
  305 
  306         if (c < 0x100) {
  307                 c1 = C2I1(c << 8);
  308                 c2 = C2I2(c << 8);
  309         } else if (c < 0x10000) {
  310                 c1 = C2I1(c);
  311                 c2 = C2I2(c);
  312         } else
  313                 return (c);
  314 
  315         if (dp->d_table[c1] && dp->d_table[c1][c2] & XLAT16_HAS_LOWER_CASE) {
  316                 /*return (int)(dp->d_table[c1][c2] & 0xffff);*/
  317                 out = dp->d_table[c1][c2] & 0xffff;
  318                 if ((out & 0xff) == 0)
  319                         out = (out >> 8) & 0xff;
  320                 return (out);
  321         } else
  322                 return (c);
  323 }
  324 
  325 static int
  326 iconv_xlat16_toupper(void *d2p, register int c)
  327 {
  328         struct iconv_xlat16 *dp = (struct iconv_xlat16*)d2p;
  329         register int c1, c2, out;
  330 
  331         if (c < 0x100) {
  332                 c1 = C2I1(c << 8);
  333                 c2 = C2I2(c << 8);
  334         } else if (c < 0x10000) {
  335                 c1 = C2I1(c);
  336                 c2 = C2I2(c);
  337         } else
  338                 return (c);
  339 
  340         if (dp->d_table[c1] && dp->d_table[c1][c2] & XLAT16_HAS_UPPER_CASE) {
  341                 out = dp->d_table[c1][c2] & 0xffff;
  342                 if ((out & 0xff) == 0)
  343                         out = (out >> 8) & 0xff;
  344                 return (out);
  345         } else
  346                 return (c);
  347 }
  348 
  349 static kobj_method_t iconv_xlat16_methods[] = {
  350         KOBJMETHOD(iconv_converter_open,        iconv_xlat16_open),
  351         KOBJMETHOD(iconv_converter_close,       iconv_xlat16_close),
  352         KOBJMETHOD(iconv_converter_conv,        iconv_xlat16_conv),
  353 #if 0
  354         KOBJMETHOD(iconv_converter_init,        iconv_xlat16_init),
  355         KOBJMETHOD(iconv_converter_done,        iconv_xlat16_done),
  356 #endif
  357         KOBJMETHOD(iconv_converter_name,        iconv_xlat16_name),
  358         KOBJMETHOD(iconv_converter_tolower,     iconv_xlat16_tolower),
  359         KOBJMETHOD(iconv_converter_toupper,     iconv_xlat16_toupper),
  360         {0, 0}
  361 };
  362 
  363 KICONV_CONVERTER(xlat16, sizeof(struct iconv_xlat16));

Cache object: da521024c691dc1cbdf9895e8adb80c4


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