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  * $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         KOBJMETHOD_END
  244 };
  245 
  246 KICONV_CONVERTER(xlat16, sizeof(struct iconv_xlat16));

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

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