src/charneg.c

   1 /* This file is part of the YAZ toolkit.
   2  * Copyright (C) Index Data
   3  * See the file LICENSE for details.
   4  */
   5 /**
   6  * \file charneg.c
   7  * \brief Implements Z39.50 Charset negotiation utilities
   8  *
   9  * Helper functions for Character Set and Language Negotiation - 3
  10  */
  11 #if HAVE_CONFIG_H
  12 #include <config.h>
  13 #endif
  14
  15 #include <stdio.h>
  16 #include <yaz/otherinfo.h>
  17 #include <yaz/z-charneg.h>
  18 #include <yaz/charneg.h>
  19 #include <yaz/yaz-util.h>
  20 #include <yaz/oid_db.h>
  21
  22 static Z_External* z_ext_record2(ODR o, const char *buf)
  23 {
  24     Z_External *p;
  25     int len = strlen(buf);
  26
  27     if (!(p = (Z_External *)odr_malloc(o, sizeof(*p))))
  28         return 0;
  29     p->descriptor = 0;
  30     p->indirect_reference = 0;
  31     p->direct_reference = odr_oiddup(o, yaz_oid_negot_charset_id);
  32     p->which = Z_External_octet;
  33     p->u.octet_aligned =
  34         odr_create_Odr_oct(o, buf, len);
  35     return p;
  36 }
  37
  38 static int get_form(const char *charset)
  39 {
  40     int form = -1;
  41
  42     if (!yaz_matchstr(charset, "UCS-2"))
  43         form = 2;
  44     if (!yaz_matchstr(charset, "UCS-4"))
  45         form = 4;
  46     if (!yaz_matchstr(charset, "UTF-16"))
  47         form = 5;
  48     if (!yaz_matchstr(charset, "UTF-8"))
  49         form = 8;
  50
  51     return form;
  52 }
  53
  54 static char *set_form(Odr_oid *encoding)
  55 {
  56     static char *charset = 0;
  57     if ( oid_oidlen(encoding) != 6)
  58         return 0;
  59     if (encoding[5] == 2)
  60         charset = "UCS-2";
  61     if (encoding[5] == 4)
  62         charset = "UCS-4";
  63     if (encoding[5] == 5)
  64         charset = "UTF-16";
  65     if (encoding[5] == 8)
  66         charset = "UTF-8";
  67     return charset;
  68 }
  69
  70 static Z_OriginProposal_0 *z_get_OriginProposal_0(ODR o, const char *charset)
  71 {
  72     int form = get_form(charset);
  73     Z_OriginProposal_0 *p0 =
  74         (Z_OriginProposal_0*)odr_malloc(o, sizeof(*p0));
  75
  76     memset(p0, 0, sizeof(*p0));
  77
  78     if (form > 0)
  79     {   /* ISO 10646 (UNICODE) */
  80         char oidname[20];
  81
  82         Z_Iso10646 *is = (Z_Iso10646 *) odr_malloc(o, sizeof(*is));
  83         p0->which = Z_OriginProposal_0_iso10646;
  84         p0->u.iso10646 = is;
  85         is->collections = 0;
  86         sprintf(oidname, "1.0.10646.1.0.%d", form);
  87         is->encodingLevel = odr_getoidbystr(o, oidname);
  88     }
  89     else
  90     {   /* private ones */
  91         Z_PrivateCharacterSet *pc =
  92             (Z_PrivateCharacterSet *)odr_malloc(o, sizeof(*pc));
  93
  94         memset(pc, 0, sizeof(*pc));
  95
  96         p0->which = Z_OriginProposal_0_private;
  97         p0->u.zprivate = pc;
  98
  99         pc->which = Z_PrivateCharacterSet_externallySpecified;
 100         pc->u.externallySpecified = z_ext_record2(o, charset);
 101     }
 102     return p0;
 103 }
 104
 105 static Z_OriginProposal *z_get_OriginProposal(
 106     ODR o, const char **charsets, int num_charsets,
 107     const char **langs, int num_langs, int selected)
 108 {
 109     int i;
 110     Z_OriginProposal *p = (Z_OriginProposal *) odr_malloc(o, sizeof(*p));
 111
 112     memset(p, 0, sizeof(*p));
 113
 114     p->recordsInSelectedCharSets = (bool_t *)odr_malloc(o, sizeof(bool_t));
 115     *p->recordsInSelectedCharSets = (selected) ? 1 : 0;
 116
 117     if (charsets && num_charsets)
 118     {
 119         p->num_proposedCharSets = num_charsets;
 120         p->proposedCharSets =
 121             (Z_OriginProposal_0**)
 122             odr_malloc(o, num_charsets*sizeof(Z_OriginProposal_0*));
 123
 124         for (i = 0; i < num_charsets; i++)
 125             p->proposedCharSets[i] =
 126                 z_get_OriginProposal_0(o, charsets[i]);
 127     }
 128     if (langs && num_langs)
 129     {
 130         p->num_proposedlanguages = num_langs;
 131         p->proposedlanguages =
 132             (char **) odr_malloc(o, num_langs*sizeof(char *));
 133
 134         for (i = 0; i < num_langs; i++)
 135             p->proposedlanguages[i] = (char *)langs[i];
 136     }
 137     return p;
 138 }
 139
 140 static Z_CharSetandLanguageNegotiation *z_get_CharSetandLanguageNegotiation(
 141     ODR o)
 142 {
 143     Z_CharSetandLanguageNegotiation *p =
 144         (Z_CharSetandLanguageNegotiation *) odr_malloc(o, sizeof(*p));
 145
 146     memset(p, 0, sizeof(*p));
 147
 148     return p;
 149 }
 150
 151 /* Create EXTERNAL for negotation proposal. Client side */
 152 Z_External *yaz_set_proposal_charneg(ODR o,
 153                                      const char **charsets, int num_charsets,
 154                                      const char **langs, int num_langs,
 155                                      int selected)
 156 {
 157     Z_External *p = (Z_External *)odr_malloc(o, sizeof(*p));
 158
 159     p->descriptor = 0;
 160     p->indirect_reference = 0;
 161
 162     p->direct_reference = odr_oiddup(o, yaz_oid_negot_charset_3);
 163
 164     p->which = Z_External_charSetandLanguageNegotiation;
 165     p->u.charNeg3 = z_get_CharSetandLanguageNegotiation(o);
 166     p->u.charNeg3->which = Z_CharSetandLanguageNegotiation_proposal;
 167     p->u.charNeg3->u.proposal =
 168         z_get_OriginProposal(o, charsets, num_charsets,
 169                              langs, num_langs, selected);
 170
 171     return p;
 172 }
 173
 174 Z_External *yaz_set_proposal_charneg_list(ODR o,
 175                                           const char *delim,
 176                                           const char *charset_list,
 177                                           const char *lang_list,
 178                                           int selected)
 179 {
 180     char **charsets_addresses = 0;
 181     char **langs_addresses = 0;
 182     int charsets_count = 0;
 183     int langs_count = 0;
 184
 185     if (charset_list)
 186         nmem_strsplit(odr_getmem(o), delim, charset_list,
 187                       &charsets_addresses, &charsets_count);
 188     if (lang_list)
 189         nmem_strsplit(odr_getmem(o), delim, lang_list,
 190                       &langs_addresses, &langs_count);
 191     return yaz_set_proposal_charneg(o,
 192                                     (const char **) charsets_addresses,
 193                                     charsets_count,
 194                                     (const char **) langs_addresses,
 195                                     langs_count,
 196                                     selected);
 197 }
 198
 199
 200 /* used by yaz_set_response_charneg */
 201 static Z_TargetResponse *z_get_TargetResponse(ODR o, const char *charset,
 202                                               const char *lang, int selected)
 203 {
 204     Z_TargetResponse *p = (Z_TargetResponse *) odr_malloc(o, sizeof(*p));
 205     int form = get_form(charset);
 206
 207     memset(p, 0, sizeof(*p));
 208     if (form > 0)
 209     {
 210         char oidname[20];
 211
 212         Z_Iso10646 *is = (Z_Iso10646 *) odr_malloc (o, sizeof(*is));
 213         p->which = Z_TargetResponse_iso10646;
 214         p->u.iso10646 = is;
 215         is->collections = 0;
 216         sprintf(oidname, "1.0.10646.1.0.%d", form);
 217         is->encodingLevel = odr_getoidbystr (o, oidname);
 218     }
 219     else
 220     {
 221         Z_PrivateCharacterSet *pc =
 222             (Z_PrivateCharacterSet *)odr_malloc(o, sizeof(*pc));
 223
 224         memset(pc, 0, sizeof(*pc));
 225
 226         p->which = Z_TargetResponse_private;
 227         p->u.zprivate = pc;
 228
 229         pc->which = Z_PrivateCharacterSet_externallySpecified;
 230         pc->u.externallySpecified =
 231             z_ext_record2(o, charset);
 232     }
 233     p->recordsInSelectedCharSets = (bool_t *)odr_malloc(o, sizeof(bool_t));
 234     *p->recordsInSelectedCharSets = (selected) ? 1 : 0;
 235
 236     p->selectedLanguage = lang ? (char *) odr_strdup(o, lang) : 0;
 237     return p;
 238 }
 239
 240 /* Create charset response. Server side */
 241 Z_External *yaz_set_response_charneg(ODR o, const char *charset,
 242                                      const char *lang, int selected)
 243 {
 244     Z_External *p = (Z_External *)odr_malloc(o, sizeof(*p));
 245
 246     p->descriptor = 0;
 247     p->indirect_reference = 0;
 248
 249     p->direct_reference = odr_oiddup(o, yaz_oid_negot_charset_3);
 250
 251     p->which = Z_External_charSetandLanguageNegotiation;
 252     p->u.charNeg3 = z_get_CharSetandLanguageNegotiation(o);
 253     p->u.charNeg3->which = Z_CharSetandLanguageNegotiation_response;
 254     p->u.charNeg3->u.response = z_get_TargetResponse(o, charset, lang, selected);
 255
 256     return p;
 257 }
 258
 259 /* Get negotiation from OtherInformation. Client&Server side */
 260 Z_CharSetandLanguageNegotiation *yaz_get_charneg_record(Z_OtherInformation *p)
 261 {
 262     int i;
 263
 264     if (!p)
 265         return 0;
 266
 267     for (i = 0; i < p->num_elements; i++)
 268     {
 269         Z_External *pext;
 270         if ((p->list[i]->which == Z_OtherInfo_externallyDefinedInfo) &&
 271             (pext = p->list[i]->information.externallyDefinedInfo))
 272         {
 273             if (!oid_oidcmp(pext->direct_reference, yaz_oid_negot_charset_3)
 274                 && pext->which == Z_External_charSetandLanguageNegotiation)
 275             {
 276                 return pext->u.charNeg3;
 277             }
 278         }
 279     }
 280     return 0;
 281 }
 282
 283 /* Delete negotiation from OtherInformation. Client&Server side */
 284 int yaz_del_charneg_record(Z_OtherInformation **p)
 285 {
 286     int i;
 287
 288     if (!*p)
 289         return 0;
 290
 291     for (i = 0; i < (*p)->num_elements; i++)
 292     {
 293         Z_External *pext;
 294         if (((*p)->list[i]->which == Z_OtherInfo_externallyDefinedInfo) &&
 295             (pext = (*p)->list[i]->information.externallyDefinedInfo))
 296         {
 297             if (!oid_oidcmp(pext->direct_reference, yaz_oid_negot_charset_3)
 298                 && pext->which == Z_External_charSetandLanguageNegotiation)
 299             {
 300                 if ((*p)->num_elements <= 1)
 301                     *p = 0;
 302                 else
 303                 {
 304                     --((*p)->num_elements);
 305                     for (; i < (*p)->num_elements; i++)
 306                         (*p)->list[i] = (*p)->list[i+1];
 307                 }
 308                 return 1;
 309             }
 310         }
 311     }
 312     return 0;
 313 }
 314
 315
 316 /* Get charsets, langs, selected from negotiation.. Server side */
 317 void yaz_get_proposal_charneg(NMEM mem, Z_CharSetandLanguageNegotiation *p,
 318                               char ***charsets, int *num_charsets,
 319                               char ***langs, int *num_langs, int *selected)
 320 {
 321     int i;
 322     Z_OriginProposal *pro = p->u.proposal;
 323
 324     if (num_charsets && charsets)
 325     {
 326         if (pro->num_proposedCharSets)
 327         {
 328             *num_charsets = pro->num_proposedCharSets;
 329
 330             (*charsets) = (char **)
 331                 nmem_malloc(mem, pro->num_proposedCharSets * sizeof(char *));
 332
 333             for (i = 0; i < pro->num_proposedCharSets; i++)
 334             {
 335                 (*charsets)[i] = 0;
 336
 337                 if (pro->proposedCharSets[i]->which ==
 338                     Z_OriginProposal_0_private &&
 339                     pro->proposedCharSets[i]->u.zprivate->which ==
 340                     Z_PrivateCharacterSet_externallySpecified)
 341                 {
 342                     Z_External *pext =
 343                         pro->proposedCharSets[i]->u.zprivate->u.externallySpecified;
 344
 345                     if (pext->which == Z_External_octet)
 346                     {
 347                         (*charsets)[i] = (char *)
 348                             nmem_malloc(mem, (1+pext->u.octet_aligned->len) *
 349                                         sizeof(char));
 350
 351                         memcpy((*charsets)[i], pext->u.octet_aligned->buf,
 352                                pext->u.octet_aligned->len);
 353                         (*charsets)[i][pext->u.octet_aligned->len] = 0;
 354                     }
 355                 }
 356                 else if (pro->proposedCharSets[i]->which ==
 357                          Z_OriginProposal_0_iso10646)
 358                     (*charsets)[i] = set_form(
 359                         pro->proposedCharSets[i]->u.iso10646->encodingLevel);
 360             }
 361         }
 362         else
 363             *num_charsets = 0;
 364     }
 365
 366     if (langs && num_langs)
 367     {
 368         if (pro->num_proposedlanguages)
 369         {
 370             *num_langs = pro->num_proposedlanguages;
 371
 372             (*langs) = (char **)
 373                 nmem_malloc(mem, pro->num_proposedlanguages * sizeof(char *));
 374
 375             for (i = 0; i < pro->num_proposedlanguages; i++)
 376                 (*langs)[i] = nmem_strdup(mem, pro->proposedlanguages[i]);
 377         }
 378         else
 379             *num_langs = 0;
 380     }
 381
 382     if (pro->recordsInSelectedCharSets && selected)
 383         *selected = *pro->recordsInSelectedCharSets;
 384 }
 385
 386 /* Return charset, lang, selected from negotiation.. Client side */
 387 void yaz_get_response_charneg(NMEM mem, Z_CharSetandLanguageNegotiation *p,
 388                               char **charset, char **lang, int *selected)
 389 {
 390     Z_TargetResponse *res = p->u.response;
 391
 392     if (charset && res->which == Z_TargetResponse_private &&
 393         res->u.zprivate->which == Z_PrivateCharacterSet_externallySpecified)
 394     {
 395         Z_External *pext = res->u.zprivate->u.externallySpecified;
 396
 397         if (pext->which == Z_External_octet)
 398         {
 399             *charset = (char *)
 400                 nmem_malloc(mem, (1+pext->u.octet_aligned->len)*sizeof(char));
 401             memcpy(*charset, pext->u.octet_aligned->buf,
 402                    pext->u.octet_aligned->len);
 403             (*charset)[pext->u.octet_aligned->len] = 0;
 404         }
 405     }
 406     if (charset && res->which == Z_TargetResponse_iso10646)
 407         *charset = set_form(res->u.iso10646->encodingLevel);
 408     if (lang && res->selectedLanguage)
 409         *lang = nmem_strdup(mem, res->selectedLanguage);
 410
 411     if (selected && res->recordsInSelectedCharSets)
 412         *selected = *res->recordsInSelectedCharSets;
 413 }
 414 /*
 415  * Local variables:
 416  * c-basic-offset: 4
 417  * c-file-style: "Stroustrup"
 418  * indent-tabs-mode: nil
 419  * End:
 420  * vim: shiftwidth=4 tabstop=8 expandtab
 421  */
 422