src/util.cpp

   1 /* This file is part of Metaproxy.
   2    Copyright (C) 2005-2013 Index Data
   3
   4 Metaproxy is free software; you can redistribute it and/or modify it under
   5 the terms of the GNU General Public License as published by the Free
   6 Software Foundation; either version 2, or (at your option) any later
   7 version.
   8
   9 Metaproxy is distributed in the hope that it will be useful, but WITHOUT ANY
  10 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12 for more details.
  13
  14 You should have received a copy of the GNU General Public License
  15 along with this program; if not, write to the Free Software
  16 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17 */
  18
  19 #include "config.hpp"
  20 #include <metaproxy/util.hpp>
  21
  22 #include <yaz/odr.h>
  23 #include <yaz/comstack.h>
  24 #include <yaz/pquery.h>
  25 #include <yaz/otherinfo.h>
  26 #include <yaz/querytowrbuf.h>
  27 #include <yaz/oid_db.h>
  28 #include <yaz/srw.h>
  29
  30 #include <iostream>
  31
  32 namespace mp = metaproxy_1;
  33
  34 // Doxygen doesn't like mp::util, so we use this instead
  35 namespace mp_util = metaproxy_1::util;
  36
  37 const char *
  38 mp_util::record_composition_to_esn(Z_RecordComposition *comp)
  39 {
  40     if (comp && comp->which == Z_RecordComp_complex)
  41     {
  42         if (comp->u.complex->generic
  43             && comp->u.complex->generic->elementSpec
  44             && (comp->u.complex->generic->elementSpec->which ==
  45                 Z_ElementSpec_elementSetName))
  46             return comp->u.complex->generic->elementSpec->u.elementSetName;
  47     }
  48     else if (comp && comp->which == Z_RecordComp_simple &&
  49              comp->u.simple->which == Z_ElementSetNames_generic)
  50         return comp->u.simple->u.generic;
  51     return 0;
  52 }
  53
  54
  55
  56 std::string mp_util::http_header_value(const Z_HTTP_Header* header,
  57                                        const std::string name)
  58 {
  59     while (header && header->name
  60            && std::string(header->name) !=  name)
  61         header = header->next;
  62
  63     if (header && header->name && std::string(header->name) == name
  64         && header->value)
  65         return std::string(header->value);
  66
  67     return std::string();
  68 }
  69
  70 std::string mp_util::http_headers_debug(const Z_HTTP_Request &http_req)
  71 {
  72     std::string message("<html>\n<body>\n<h1>"
  73                         "Metaproxy SRUtoZ3950 filter"
  74                         "</h1>\n");
  75
  76     message += "<h3>HTTP Info</h3><br/>\n";
  77     message += "<p>\n";
  78     message += "<b>Method: </b> " + std::string(http_req.method) + "<br/>\n";
  79     message += "<b>Version:</b> " + std::string(http_req.version) + "<br/>\n";
  80     message += "<b>Path:   </b> " + std::string(http_req.path) + "<br/>\n";
  81
  82     message += "<b>Content-Type:</b>"
  83         + mp_util::http_header_value(http_req.headers, "Content-Type")
  84         + "<br/>\n";
  85     message += "<b>Content-Length:</b>"
  86         + mp_util::http_header_value(http_req.headers, "Content-Length")
  87         + "<br/>\n";
  88     message += "</p>\n";
  89
  90     message += "<h3>Headers</h3><br/>\n";
  91     message += "<p>\n";
  92     Z_HTTP_Header* header = http_req.headers;
  93     while (header){
  94         message += "<b>Header: </b> <i>"
  95             + std::string(header->name) + ":</i> "
  96             + std::string(header->value) + "<br/>\n";
  97         header = header->next;
  98     }
  99     message += "</p>\n";
 100     message += "</body>\n</html>\n";
 101     return message;
 102 }
 103
 104
 105 void mp_util::http_response(metaproxy_1::Package &package,
 106                      const std::string &content,
 107                      int http_code)
 108 {
 109
 110     Z_GDU *zgdu_req = package.request().get();
 111     Z_GDU *zgdu_res = 0;
 112     mp::odr odr;
 113     zgdu_res
 114        = odr.create_HTTP_Response(package.session(),
 115                                   zgdu_req->u.HTTP_Request,
 116                                   http_code);
 117
 118     zgdu_res->u.HTTP_Response->content_len = content.size();
 119     zgdu_res->u.HTTP_Response->content_buf
 120         = (char*) odr_malloc(odr, zgdu_res->u.HTTP_Response->content_len);
 121
 122     strncpy(zgdu_res->u.HTTP_Response->content_buf,
 123             content.c_str(),  zgdu_res->u.HTTP_Response->content_len);
 124
 125     //z_HTTP_header_add(odr, &hres->headers,
 126     //                  "Content-Type", content_type.c_str());
 127     package.response() = zgdu_res;
 128 }
 129
 130
 131 int mp_util::memcmp2(const void *buf1, int len1,
 132                      const void *buf2, int len2)
 133 {
 134     int d = len1 - len2;
 135
 136     // compare buffer (common length)
 137     int c = memcmp(buf1, buf2, d > 0 ? len2 : len1);
 138     if (c > 0)
 139         return 1;
 140     else if (c < 0)
 141         return -1;
 142
 143     // compare (remaining bytes)
 144     if (d > 0)
 145         return 1;
 146     else if (d < 0)
 147         return -1;
 148     return 0;
 149 }
 150
 151
 152 std::string mp_util::database_name_normalize(const std::string &s)
 153 {
 154     std::string r = s;
 155     size_t i;
 156     for (i = 0; i < r.length(); i++)
 157     {
 158         int ch = r[i];
 159         if (ch >= 'A' && ch <= 'Z')
 160             r[i] = ch + 'a' - 'A';
 161     }
 162     return r;
 163
 164 }
 165
 166 Z_RecordComposition *mp_util::piggyback_to_RecordComposition(
 167     ODR odr, Odr_int result_set_size, Z_SearchRequest *sreq)
 168 {
 169     Z_RecordComposition *comp = 0;
 170     Odr_int present_dummy;
 171     const char *element_set_name = 0;
 172     mp::util::piggyback_sr(sreq, result_set_size,
 173                            present_dummy, &element_set_name);
 174     if (element_set_name)
 175     {
 176         comp  = (Z_RecordComposition *) odr_malloc(odr, sizeof(*comp));
 177         comp->which = Z_RecordComp_simple;
 178         comp->u.simple = (Z_ElementSetNames *)
 179             odr_malloc(odr, sizeof(Z_ElementSetNames));
 180         comp->u.simple->which = Z_ElementSetNames_generic;
 181         comp->u.simple->u.generic = odr_strdup(odr, element_set_name);
 182     }
 183     return comp;
 184 }
 185
 186 void mp_util::piggyback_sr(Z_SearchRequest *sreq,
 187                            Odr_int result_set_size,
 188                            Odr_int &number_to_present,
 189                            const char **element_set_name)
 190 {
 191     Z_ElementSetNames *esn;
 192     const char *smallSetElementSetNames = 0;
 193     const char *mediumSetElementSetNames = 0;
 194
 195     esn = sreq->smallSetElementSetNames;
 196     if (esn && esn->which == Z_ElementSetNames_generic)
 197         smallSetElementSetNames = esn->u.generic;
 198
 199     esn = sreq->mediumSetElementSetNames;
 200     if (esn && esn->which == Z_ElementSetNames_generic)
 201         mediumSetElementSetNames = esn->u.generic;
 202
 203     piggyback(*sreq->smallSetUpperBound,
 204               *sreq->largeSetLowerBound,
 205               *sreq->mediumSetPresentNumber,
 206               smallSetElementSetNames,
 207               mediumSetElementSetNames,
 208               result_set_size,
 209               number_to_present,
 210               element_set_name);
 211 }
 212
 213 void mp_util::piggyback(int smallSetUpperBound,
 214                         int largeSetLowerBound,
 215                         int mediumSetPresentNumber,
 216                         int result_set_size,
 217                         int &number_to_present)
 218 {
 219     Odr_int tmp = number_to_present;
 220     piggyback(smallSetUpperBound, largeSetLowerBound, mediumSetPresentNumber,
 221               0, 0, result_set_size, tmp, 0);
 222     number_to_present = tmp;
 223 }
 224
 225 void mp_util::piggyback(Odr_int smallSetUpperBound,
 226                         Odr_int largeSetLowerBound,
 227                         Odr_int mediumSetPresentNumber,
 228                         const char *smallSetElementSetNames,
 229                         const char *mediumSetElementSetNames,
 230                         Odr_int result_set_size,
 231                         Odr_int &number_to_present,
 232                         const char **element_set_name)
 233 {
 234     // deal with piggyback
 235
 236     if (result_set_size < smallSetUpperBound)
 237     {
 238         // small set . Return all records in set
 239         number_to_present = result_set_size;
 240         if (element_set_name && smallSetElementSetNames)
 241             *element_set_name = smallSetElementSetNames;
 242
 243     }
 244     else if (result_set_size > largeSetLowerBound)
 245     {
 246         // large set . Return no records
 247         number_to_present = 0;
 248         if (element_set_name)
 249             *element_set_name = 0;
 250     }
 251     else
 252     {
 253         // medium set . Return mediumSetPresentNumber records
 254         number_to_present = mediumSetPresentNumber;
 255         if (number_to_present > result_set_size)
 256             number_to_present = result_set_size;
 257         if (element_set_name && mediumSetElementSetNames)
 258             *element_set_name = mediumSetElementSetNames;
 259     }
 260 }
 261
 262 bool mp_util::pqf(ODR odr, Z_APDU *apdu, const std::string &q)
 263 {
 264     YAZ_PQF_Parser pqf_parser = yaz_pqf_create();
 265
 266     Z_RPNQuery *rpn = yaz_pqf_parse(pqf_parser, odr, q.c_str());
 267     if (!rpn)
 268     {
 269         yaz_pqf_destroy(pqf_parser);
 270         return false;
 271     }
 272     yaz_pqf_destroy(pqf_parser);
 273     Z_Query *query = (Z_Query *) odr_malloc(odr, sizeof(Z_Query));
 274     query->which = Z_Query_type_1;
 275     query->u.type_1 = rpn;
 276
 277     apdu->u.searchRequest->query = query;
 278     return true;
 279 }
 280
 281
 282 std::string mp_util::zQueryToString(Z_Query *query)
 283 {
 284     std::string query_str = "";
 285
 286     if (query && query->which == Z_Query_type_1)
 287     {
 288         Z_RPNQuery *rpn = query->u.type_1;
 289
 290         if (rpn)
 291         {
 292             mp::wrbuf w;
 293
 294             // put query in w
 295             yaz_rpnquery_to_wrbuf(w, rpn);
 296
 297             // from w to std::string
 298             query_str = std::string(w.buf(), w.len());
 299         }
 300     }
 301
 302 #if 0
 303     if (query && query->which == Z_Query_type_1){
 304
 305         // allocate wrbuf (strings in YAZ!)
 306         WRBUF w = wrbuf_alloc();
 307
 308         // put query in w
 309         yaz_query_to_wrbuf(w, query);
 310
 311         // from w to std::string
 312         query_str = std::string(wrbuf_buf(w), wrbuf_len(w));
 313
 314         // destroy wrbuf
 315         wrbuf_free(w, 1);
 316     }
 317 #endif
 318     return query_str;
 319 }
 320
 321 void mp_util::get_default_diag(Z_DefaultDiagFormat *r,
 322                                          int &error_code, std::string &addinfo)
 323 {
 324     error_code = *r->condition;
 325     switch (r->which)
 326     {
 327     case Z_DefaultDiagFormat_v2Addinfo:
 328         addinfo = std::string(r->u.v2Addinfo);
 329         break;
 330     case Z_DefaultDiagFormat_v3Addinfo:
 331         addinfo = r->u.v3Addinfo;
 332         break;
 333     }
 334 }
 335
 336 void mp_util::get_init_diagnostics(
 337     Z_InitResponse *initrs, int &error_code, std::string &addinfo)
 338 {
 339
 340     Z_DefaultDiagFormat *df = yaz_decode_init_diag(0, initrs);
 341
 342     if (df)
 343         get_default_diag(df, error_code, addinfo);
 344 }
 345
 346 int mp_util::get_or_remove_vhost_otherinfo(
 347     Z_OtherInformation **otherInformation,
 348     bool remove_flag,
 349     std::list<std::string> &vhosts)
 350 {
 351     int cat;
 352     for (cat = 1; ; cat++)
 353     {
 354         // check virtual host
 355         const char *vhost =
 356             yaz_oi_get_string_oid(otherInformation,
 357                                   yaz_oid_userinfo_proxy,
 358                                   cat /* categoryValue */,
 359                                   remove_flag /* delete flag */);
 360         if (!vhost)
 361             break;
 362         vhosts.push_back(std::string(vhost));
 363     }
 364     --cat;
 365     return cat;
 366 }
 367
 368 void mp_util::get_vhost_otherinfo(
 369     Z_OtherInformation *otherInformation,
 370     std::list<std::string> &vhosts)
 371 {
 372     get_or_remove_vhost_otherinfo(&otherInformation, false, vhosts);
 373 }
 374
 375 int mp_util::remove_vhost_otherinfo(
 376     Z_OtherInformation **otherInformation,
 377     std::list<std::string> &vhosts)
 378 {
 379     return get_or_remove_vhost_otherinfo(otherInformation, true, vhosts);
 380 }
 381
 382 void mp_util::set_vhost_otherinfo(
 383     Z_OtherInformation **otherInformation, ODR odr,
 384     const std::list<std::string> &vhosts)
 385 {
 386     int cat;
 387     std::list<std::string>::const_iterator it = vhosts.begin();
 388
 389     for (cat = 1; it != vhosts.end() ; cat++, it++)
 390     {
 391         yaz_oi_set_string_oid(otherInformation, odr,
 392                               yaz_oid_userinfo_proxy, cat, it->c_str());
 393     }
 394 }
 395
 396 void mp_util::set_vhost_otherinfo(
 397     Z_OtherInformation **otherInformation, ODR odr,
 398     const std::string vhost, const int cat)
 399 {
 400     yaz_oi_set_string_oid(otherInformation, odr,
 401                           yaz_oid_userinfo_proxy, cat, vhost.c_str());
 402 }
 403
 404 void mp_util::split_zurl(std::string zurl, std::string &host,
 405                          std::list<std::string> &db)
 406 {
 407     const char *zurl_cstr = zurl.c_str();
 408     const char *args = 0;
 409     cs_get_host_args(zurl_cstr, &args);
 410
 411     if (args && *args)
 412     {
 413         host = std::string(zurl_cstr, args - zurl_cstr);
 414
 415         const char *cp1 = args;
 416         while (1)
 417         {
 418             const char *cp2 = strchr(cp1, '+');
 419             if (cp2)
 420                 db.push_back(std::string(cp1, cp2 - cp1));
 421             else
 422             {
 423                 db.push_back(std::string(cp1));
 424                 break;
 425             }
 426             cp1 = cp2+1;
 427         }
 428     }
 429     else
 430         host = zurl;
 431 }
 432
 433 bool mp_util::set_databases_from_zurl(
 434     ODR odr, std::string zurl,
 435     int *db_num, char ***db_strings)
 436 {
 437     std::string host;
 438     std::list<std::string> dblist;
 439
 440     split_zurl(zurl, host, dblist);
 441
 442     if (dblist.size() == 0)
 443         return false;
 444     *db_num = dblist.size();
 445     *db_strings = (char **) odr_malloc(odr, sizeof(char*) * (*db_num));
 446
 447     std::list<std::string>::const_iterator it = dblist.begin();
 448     for (int i = 0; it != dblist.end(); it++, i++)
 449         (*db_strings)[i] = odr_strdup(odr, it->c_str());
 450     return true;
 451 }
 452
 453 mp::odr::odr(int type)
 454 {
 455     m_odr = odr_createmem(type);
 456 }
 457
 458 mp::odr::odr()
 459 {
 460     m_odr = odr_createmem(ODR_ENCODE);
 461 }
 462
 463 mp::odr::~odr()
 464 {
 465     odr_destroy(m_odr);
 466 }
 467
 468 mp::odr::operator ODR() const
 469 {
 470     return m_odr;
 471 }
 472
 473 Z_APDU *mp::odr::create_close(const Z_APDU *in_apdu,
 474                               int reason, const char *addinfo)
 475 {
 476     Z_APDU *apdu = create_APDU(Z_APDU_close, in_apdu);
 477
 478     *apdu->u.close->closeReason = reason;
 479     if (addinfo)
 480         apdu->u.close->diagnosticInformation = odr_strdup(m_odr, addinfo);
 481     return apdu;
 482 }
 483
 484 Z_APDU *mp::odr::create_APDU(int type, const Z_APDU *in_apdu)
 485 {
 486     return mp::util::create_APDU(m_odr, type, in_apdu);
 487 }
 488
 489 Z_APDU *mp_util::create_APDU(ODR odr, int type, const Z_APDU *in_apdu)
 490 {
 491     Z_APDU *out_apdu = zget_APDU(odr, type);
 492     transfer_referenceId(odr, in_apdu, out_apdu);
 493     return out_apdu;
 494 }
 495
 496 void mp_util::transfer_referenceId(ODR odr, const Z_APDU *src, Z_APDU *dst)
 497 {
 498     Z_ReferenceId **id_to = mp::util::get_referenceId(dst);
 499     *id_to = 0;
 500     if (src)
 501     {
 502         Z_ReferenceId **id_from = mp::util::get_referenceId(src);
 503         if (id_from && *id_from)
 504             *id_to = odr_create_Odr_oct(odr, (*id_from)->buf,
 505                                         (*id_from)->len);
 506     }
 507 }
 508
 509 Z_APDU *mp::odr::create_initResponse(const Z_APDU *in_apdu,
 510                                      int error, const char *addinfo)
 511 {
 512     Z_APDU *apdu = create_APDU(Z_APDU_initResponse, in_apdu);
 513     if (error)
 514     {
 515         apdu->u.initResponse->userInformationField =
 516             zget_init_diagnostics(m_odr, error, addinfo);
 517         *apdu->u.initResponse->result = 0;
 518     }
 519     apdu->u.initResponse->implementationName =
 520         odr_prepend(m_odr, "Metaproxy",
 521                     apdu->u.initResponse->implementationName);
 522     apdu->u.initResponse->implementationVersion =
 523         odr_prepend(m_odr,
 524                     VERSION, apdu->u.initResponse->implementationVersion);
 525
 526     return apdu;
 527 }
 528
 529 Z_APDU *mp::odr::create_searchResponse(const Z_APDU *in_apdu,
 530                                        int error, const char *addinfo)
 531 {
 532     Z_APDU *apdu = create_APDU(Z_APDU_searchResponse, in_apdu);
 533     if (error)
 534     {
 535         Z_Records *rec = (Z_Records *) odr_malloc(m_odr, sizeof(Z_Records));
 536         *apdu->u.searchResponse->searchStatus = 0;
 537         apdu->u.searchResponse->records = rec;
 538         rec->which = Z_Records_NSD;
 539         rec->u.nonSurrogateDiagnostic =
 540             zget_DefaultDiagFormat(m_odr, error, addinfo);
 541
 542     }
 543     return apdu;
 544 }
 545
 546 Z_APDU *mp::odr::create_presentResponse(const Z_APDU *in_apdu,
 547                                         int error, const char *addinfo)
 548 {
 549     Z_APDU *apdu = create_APDU(Z_APDU_presentResponse, in_apdu);
 550     if (error)
 551     {
 552         Z_Records *rec = (Z_Records *) odr_malloc(m_odr, sizeof(Z_Records));
 553         apdu->u.presentResponse->records = rec;
 554
 555         rec->which = Z_Records_NSD;
 556         rec->u.nonSurrogateDiagnostic =
 557             zget_DefaultDiagFormat(m_odr, error, addinfo);
 558         *apdu->u.presentResponse->presentStatus = Z_PresentStatus_failure;
 559     }
 560     return apdu;
 561 }
 562
 563 Z_APDU *mp::odr::create_scanResponse(const Z_APDU *in_apdu,
 564                                      int error, const char *addinfo)
 565 {
 566     Z_APDU *apdu = create_APDU(Z_APDU_scanResponse, in_apdu);
 567     Z_ScanResponse *res = apdu->u.scanResponse;
 568     res->entries = (Z_ListEntries *) odr_malloc(m_odr, sizeof(*res->entries));
 569     res->entries->num_entries = 0;
 570     res->entries->entries = 0;
 571
 572     if (error)
 573     {
 574         *res->scanStatus = Z_Scan_failure;
 575
 576         res->entries->num_nonsurrogateDiagnostics = 1;
 577         res->entries->nonsurrogateDiagnostics = (Z_DiagRec **)
 578             odr_malloc(m_odr, sizeof(Z_DiagRec *));
 579         res->entries->nonsurrogateDiagnostics[0] =
 580             zget_DiagRec(m_odr, error, addinfo);
 581     }
 582     else
 583     {
 584         res->entries->num_nonsurrogateDiagnostics = 0;
 585         res->entries->nonsurrogateDiagnostics = 0;
 586     }
 587     return apdu;
 588 }
 589
 590 Z_GDU *mp::odr::create_HTTP_Response_details(mp::Session &session,
 591                                              Z_HTTP_Request *hreq, int code,
 592                                              const char *details)
 593 {
 594     const char *response_version = "1.0";
 595     bool keepalive = false;
 596     if (!strcmp(hreq->version, "1.0"))
 597     {
 598         const char *v = z_HTTP_header_lookup(hreq->headers, "Connection");
 599         if (v && !strcmp(v, "Keep-Alive"))
 600             keepalive = true;
 601         else
 602             session.close();
 603         response_version = "1.0";
 604     }
 605     else
 606     {
 607         const char *v = z_HTTP_header_lookup(hreq->headers, "Connection");
 608         if (v && !strcmp(v, "close"))
 609             session.close();
 610         else
 611             keepalive = true;
 612         response_version = "1.1";
 613     }
 614
 615     Z_GDU *gdu = z_get_HTTP_Response_details(m_odr, code, details);
 616     Z_HTTP_Response *hres = gdu->u.HTTP_Response;
 617     hres->version = odr_strdup(m_odr, response_version);
 618     if (keepalive)
 619         z_HTTP_header_add(m_odr, &hres->headers, "Connection", "Keep-Alive");
 620
 621     return gdu;
 622 }
 623
 624 Z_GDU *mp::odr::create_HTTP_Response(mp::Session &session,
 625                                      Z_HTTP_Request *hreq, int code)
 626 {
 627     return create_HTTP_Response_details(session, hreq, code, 0);
 628
 629 }
 630
 631 Z_ReferenceId **mp_util::get_referenceId(const Z_APDU *apdu)
 632 {
 633     switch (apdu->which)
 634     {
 635     case  Z_APDU_initRequest:
 636         return &apdu->u.initRequest->referenceId;
 637     case  Z_APDU_initResponse:
 638         return &apdu->u.initResponse->referenceId;
 639     case  Z_APDU_searchRequest:
 640         return &apdu->u.searchRequest->referenceId;
 641     case  Z_APDU_searchResponse:
 642         return &apdu->u.searchResponse->referenceId;
 643     case  Z_APDU_presentRequest:
 644         return &apdu->u.presentRequest->referenceId;
 645     case  Z_APDU_presentResponse:
 646         return &apdu->u.presentResponse->referenceId;
 647     case  Z_APDU_deleteResultSetRequest:
 648         return &apdu->u.deleteResultSetRequest->referenceId;
 649     case  Z_APDU_deleteResultSetResponse:
 650         return &apdu->u.deleteResultSetResponse->referenceId;
 651     case  Z_APDU_accessControlRequest:
 652         return &apdu->u.accessControlRequest->referenceId;
 653     case  Z_APDU_accessControlResponse:
 654         return &apdu->u.accessControlResponse->referenceId;
 655     case  Z_APDU_resourceControlRequest:
 656         return &apdu->u.resourceControlRequest->referenceId;
 657     case  Z_APDU_resourceControlResponse:
 658         return &apdu->u.resourceControlResponse->referenceId;
 659     case  Z_APDU_triggerResourceControlRequest:
 660         return &apdu->u.triggerResourceControlRequest->referenceId;
 661     case  Z_APDU_resourceReportRequest:
 662         return &apdu->u.resourceReportRequest->referenceId;
 663     case  Z_APDU_resourceReportResponse:
 664         return &apdu->u.resourceReportResponse->referenceId;
 665     case  Z_APDU_scanRequest:
 666         return &apdu->u.scanRequest->referenceId;
 667     case  Z_APDU_scanResponse:
 668         return &apdu->u.scanResponse->referenceId;
 669     case  Z_APDU_sortRequest:
 670         return &apdu->u.sortRequest->referenceId;
 671     case  Z_APDU_sortResponse:
 672         return &apdu->u.sortResponse->referenceId;
 673     case  Z_APDU_segmentRequest:
 674         return &apdu->u.segmentRequest->referenceId;
 675     case  Z_APDU_extendedServicesRequest:
 676         return &apdu->u.extendedServicesRequest->referenceId;
 677     case  Z_APDU_extendedServicesResponse:
 678         return &apdu->u.extendedServicesResponse->referenceId;
 679     case  Z_APDU_close:
 680         return &apdu->u.close->referenceId;
 681     }
 682     return 0;
 683 }
 684
 685 std::string mp_util::uri_encode(std::string s)
 686 {
 687     char *x = (char *) xmalloc(1 + s.length() * 3);
 688     yaz_encode_uri_component(x, s.c_str());
 689     std::string result(x);
 690     xfree(x);
 691     return result;
 692 }
 693
 694
 695 std::string mp_util::uri_decode(std::string s)
 696 {
 697     char *x = (char *) xmalloc(1 + s.length());
 698     yaz_decode_uri_component(x, s.c_str(), s.length());
 699     std::string result(x);
 700     xfree(x);
 701     return result;
 702 }
 703
 704 mp::wrbuf::wrbuf()
 705 {
 706     m_wrbuf = wrbuf_alloc();
 707 }
 708
 709 mp::wrbuf::~wrbuf()
 710 {
 711     wrbuf_destroy(m_wrbuf);
 712 }
 713
 714 mp::wrbuf::operator WRBUF() const
 715 {
 716     return m_wrbuf;
 717 }
 718
 719 size_t mp::wrbuf::len()
 720 {
 721     return wrbuf_len(m_wrbuf);
 722 }
 723
 724 const char *mp::wrbuf::buf()
 725 {
 726     return wrbuf_buf(m_wrbuf);
 727 }
 728
 729
 730 /*
 731  * Local variables:
 732  * c-basic-offset: 4
 733  * c-file-style: "Stroustrup"
 734  * indent-tabs-mode: nil
 735  * End:
 736  * vim: shiftwidth=4 tabstop=8 expandtab
 737  */
 738