sys/libiconv/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  * $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         {0, 0}
 244 };
 245
 246 KICONV_CONVERTER(xlat16, sizeof(struct iconv_xlat16));