iconv_xlat16.c

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    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));

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FreeBSD/Linux Kernel Cross Reference sys/libkern/iconv_xlat16.c

FreeBSD/Linux Kernel Cross Reference
sys/libkern/iconv_xlat16.c