git.sesse.net Git - vlc/blob - modules/demux/playlist/xspf.c

   1 /*******************************************************************************
   2  * xspf.c : XSPF playlist import functions
   3  *******************************************************************************
   4  * Copyright (C) 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Daniel Stränger <vlc at schmaller dot de>
   8  *          Yoann Peronneau <yoann@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *******************************************************************************/
  24 /**
  25  * \file modules/demux/playlist/xspf.c
  26  * \brief XSPF playlist import functions
  27  */
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc_demux.h>
  31
  32 #include "playlist.h"
  33 #include "vlc_xml.h"
  34 #include "vlc_strings.h"
  35 #include "vlc_url.h"
  36 #include "xspf.h"
  37
  38 struct demux_sys_t
  39 {
  40     playlist_item_t *p_item_in_category;
  41     input_item_t **pp_tracklist;
  42     int i_tracklist_entries;
  43     int i_identifier;
  44     char * psz_base;
  45 };
  46
  47 static int Control( demux_t *, int, va_list );
  48 static int Demux( demux_t * );
  49
  50 /**
  51  * \brief XSPF submodule initialization function
  52  */
  53 int E_(Import_xspf)( vlc_object_t *p_this )
  54 {
  55     DEMUX_BY_EXTENSION_OR_FORCED_MSG( ".xspf", "xspf-open",
  56                                       "using XSPF playlist reader" );
  57     return VLC_SUCCESS;
  58 }
  59
  60 void E_(Close_xspf)( vlc_object_t *p_this )
  61 {
  62     demux_t *p_demux = (demux_t *)p_this;
  63     FREENULL( p_demux->p_sys->pp_tracklist );
  64     FREENULL( p_demux->p_sys->psz_base );
  65     free( p_demux->p_sys );
  66 }
  67
  68 /**
  69  * \brief demuxer function for XSPF parsing
  70  */
  71 int Demux( demux_t *p_demux )
  72 {
  73     int i_ret = 1;
  74     xml_t *p_xml = NULL;
  75     xml_reader_t *p_xml_reader = NULL;
  76     char *psz_name = NULL;
  77     INIT_PLAYLIST_STUFF;
  78     p_demux->p_sys->pp_tracklist = NULL;
  79     p_demux->p_sys->i_tracklist_entries = 0;
  80     p_demux->p_sys->i_identifier = 0;
  81     p_demux->p_sys->psz_base = NULL;
  82
  83     /* create new xml parser from stream */
  84     p_xml = xml_Create( p_demux );
  85     if( !p_xml )
  86         i_ret = -1;
  87     else
  88     {
  89         p_xml_reader = xml_ReaderCreate( p_xml, p_demux->s );
  90         if( !p_xml_reader )
  91             i_ret = -1;
  92     }
  93
  94     /* locating the root node */
  95     if( i_ret == 1 )
  96     {
  97         do
  98         {
  99             if( xml_ReaderRead( p_xml_reader ) != 1 )
 100             {
 101                 msg_Err( p_demux, "can't read xml stream" );
 102                 i_ret = -1;
 103             }
 104         } while( i_ret == VLC_SUCCESS &&
 105                  xml_ReaderNodeType( p_xml_reader ) != XML_READER_STARTELEM );
 106     }
 107     /* checking root node name */
 108     if( i_ret == 1 )
 109     {
 110         psz_name = xml_ReaderName( p_xml_reader );
 111         if( !psz_name || strcmp( psz_name, "playlist" ) )
 112         {
 113             msg_Err( p_demux, "invalid root node name: %s", psz_name );
 114             i_ret = -1;
 115         }
 116         FREE_NAME();
 117     }
 118
 119     if( i_ret == 1 )
 120         i_ret = parse_playlist_node( p_demux, p_playlist, p_current_input,
 121                                      p_xml_reader, "playlist" ) ? 0 : -1;
 122
 123     int i;
 124     for( i = 0 ; i < p_demux->p_sys->i_tracklist_entries ; i++ )
 125     {
 126         input_item_t *p_new_input = p_demux->p_sys->pp_tracklist[i];
 127         if( p_new_input )
 128         {
 129             input_ItemAddSubItem( p_current_input, p_new_input );
 130         }
 131     }
 132
 133     HANDLE_PLAY_AND_RELEASE;
 134     if( p_xml_reader )
 135         xml_ReaderDelete( p_xml, p_xml_reader );
 136     if( p_xml )
 137         xml_Delete( p_xml );
 138     return i_ret; /* Needed for correct operation of go back */
 139 }
 140
 141 /** \brief dummy function for demux callback interface */
 142 static int Control( demux_t *p_demux, int i_query, va_list args )
 143 {
 144     return VLC_EGENERIC;
 145 }
 146
 147 /**
 148  * \brief parse the root node of a XSPF playlist
 149  * \param p_demux demuxer instance
 150  * \param p_playlist playlist instance
 151  * \param p_input_item current input item
 152  * \param p_xml_reader xml reader instance
 153  * \param psz_element name of element to parse
 154  */
 155 static vlc_bool_t parse_playlist_node COMPLEX_INTERFACE
 156 {
 157     char *psz_name=NULL;
 158     char *psz_value=NULL;
 159     vlc_bool_t b_version_found = VLC_FALSE;
 160     int i_node;
 161     xml_elem_hnd_t *p_handler=NULL;
 162
 163     xml_elem_hnd_t pl_elements[] =
 164         { {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 165           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 166           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 167           {"info",         SIMPLE_CONTENT,  {NULL} },
 168           {"location",     SIMPLE_CONTENT,  {NULL} },
 169           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 170           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 171           {"date",         SIMPLE_CONTENT,  {NULL} },
 172           {"license",      SIMPLE_CONTENT,  {NULL} },
 173           {"attribution",  COMPLEX_CONTENT, {.cmplx = skip_element} },
 174           {"link",         SIMPLE_CONTENT,  {NULL} },
 175           {"meta",         SIMPLE_CONTENT,  {NULL} },
 176           {"extension",    COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 177           {"trackList",    COMPLEX_CONTENT, {.cmplx = parse_tracklist_node} },
 178           {NULL,           UNKNOWN_CONTENT, {NULL} }
 179         };
 180
 181     /* read all playlist attributes */
 182     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 183     {
 184         psz_name = xml_ReaderName( p_xml_reader );
 185         psz_value = xml_ReaderValue( p_xml_reader );
 186         if( !psz_name || !psz_value )
 187         {
 188             msg_Err( p_demux, "invalid xml stream @ <playlist>" );
 189             FREE_ATT();
 190             return VLC_FALSE;
 191         }
 192         /* attribute: version */
 193         if( !strcmp( psz_name, "version" ) )
 194         {
 195             b_version_found = VLC_TRUE;
 196             if( strcmp( psz_value, "0" ) && strcmp( psz_value, "1" ) )
 197                 msg_Warn( p_demux, "unsupported XSPF version" );
 198         }
 199         /* attribute: xmlns */
 200         else if( !strcmp( psz_name, "xmlns" ) )
 201             ;
 202         else if( !strcmp( psz_name, "xml:base" ) )
 203         {
 204             p_demux->p_sys->psz_base = decode_URI_duplicate( psz_value );
 205         }
 206         /* unknown attribute */
 207         else
 208             msg_Warn( p_demux, "invalid <playlist> attribute:\"%s\"", psz_name);
 209
 210         FREE_ATT();
 211     }
 212     /* attribute version is mandatory !!! */
 213     if( !b_version_found )
 214         msg_Warn( p_demux, "<playlist> requires \"version\" attribute" );
 215
 216     /* parse the child elements - we only take care of <trackList> */
 217     while( xml_ReaderRead( p_xml_reader ) == 1 )
 218     {
 219         i_node = xml_ReaderNodeType( p_xml_reader );
 220         switch( i_node )
 221         {
 222             case XML_READER_NONE:
 223                 break;
 224             case XML_READER_STARTELEM:
 225                 /*  element start tag  */
 226                 psz_name = xml_ReaderName( p_xml_reader );
 227                 if( !psz_name || !*psz_name )
 228                 {
 229                     msg_Err( p_demux, "invalid xml stream" );
 230                     FREE_ATT();
 231                     return VLC_FALSE;
 232                 }
 233                 /* choose handler */
 234                 for( p_handler = pl_elements;
 235                      p_handler->name && strcmp( psz_name, p_handler->name );
 236                      p_handler++ );
 237                 if( !p_handler->name )
 238                 {
 239                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 240                     FREE_ATT();
 241                     return VLC_FALSE;
 242                 }
 243                 FREE_NAME();
 244                 /* complex content is parsed in a separate function */
 245                 if( p_handler->type == COMPLEX_CONTENT )
 246                 {
 247                     if( p_handler->pf_handler.cmplx( p_demux,
 248                                                      p_playlist,
 249                                                      p_input_item,
 250                                                      p_xml_reader,
 251                                                      p_handler->name ) )
 252                     {
 253                         p_handler = NULL;
 254                         FREE_ATT();
 255                     }
 256                     else
 257                     {
 258                         FREE_ATT();
 259                         return VLC_FALSE;
 260                     }
 261                 }
 262                 break;
 263
 264             case XML_READER_TEXT:
 265                 /* simple element content */
 266                 FREE_ATT();
 267                 psz_value = xml_ReaderValue( p_xml_reader );
 268                 if( !psz_value )
 269                 {
 270                     msg_Err( p_demux, "invalid xml stream" );
 271                     FREE_ATT();
 272                     return VLC_FALSE;
 273                 }
 274                 break;
 275
 276             case XML_READER_ENDELEM:
 277                 /* element end tag */
 278                 psz_name = xml_ReaderName( p_xml_reader );
 279                 if( !psz_name )
 280                 {
 281                     msg_Err( p_demux, "invalid xml stream" );
 282                     FREE_ATT();
 283                     return VLC_FALSE;
 284                 }
 285                 /* leave if the current parent node <playlist> is terminated */
 286                 if( !strcmp( psz_name, psz_element ) )
 287                 {
 288                     FREE_ATT();
 289                     return VLC_TRUE;
 290                 }
 291                 /* there MUST have been a start tag for that element name */
 292                 if( !p_handler || !p_handler->name
 293                     || strcmp( p_handler->name, psz_name ))
 294                 {
 295                     msg_Err( p_demux, "there's no open element left for <%s>",
 296                              psz_name );
 297                     FREE_ATT();
 298                     return VLC_FALSE;
 299                 }
 300
 301                 if( p_handler->pf_handler.smpl )
 302                 {
 303                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 304                                                 psz_value );
 305                 }
 306                 FREE_ATT();
 307                 p_handler = NULL;
 308                 break;
 309
 310             default:
 311                 /* unknown/unexpected xml node */
 312                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 313                 FREE_ATT();
 314                 return VLC_FALSE;
 315         }
 316         FREE_NAME();
 317     }
 318     return VLC_FALSE;
 319 }
 320
 321 /**
 322  * \brief parses the tracklist node which only may contain <track>s
 323  */
 324 static vlc_bool_t parse_tracklist_node COMPLEX_INTERFACE
 325 {
 326     char *psz_name=NULL;
 327     int i_node;
 328     int i_ntracks = 0;
 329
 330     /* now parse the <track>s */
 331     while( xml_ReaderRead( p_xml_reader ) == 1 )
 332     {
 333         i_node = xml_ReaderNodeType( p_xml_reader );
 334         if( i_node == XML_READER_STARTELEM )
 335         {
 336             psz_name = xml_ReaderName( p_xml_reader );
 337             if( !psz_name )
 338             {
 339                 msg_Err( p_demux, "unexpected end of xml data" );
 340                 FREE_NAME();
 341                 return VLC_FALSE;
 342             }
 343             if( strcmp( psz_name, "track") )
 344             {
 345                 msg_Err( p_demux, "unexpected child of <trackList>: <%s>",
 346                          psz_name );
 347                 FREE_NAME();
 348                 return VLC_FALSE;
 349             }
 350             FREE_NAME();
 351
 352             /* parse the track data in a separate function */
 353             if( parse_track_node( p_demux, p_playlist, p_input_item,
 354                                    p_xml_reader,"track" ) == VLC_TRUE )
 355                 i_ntracks++;
 356         }
 357         else if( i_node == XML_READER_ENDELEM )
 358             break;
 359     }
 360
 361     /* the <trackList> has to be terminated */
 362     if( xml_ReaderNodeType( p_xml_reader ) != XML_READER_ENDELEM )
 363     {
 364         msg_Err( p_demux, "there's a missing </trackList>" );
 365         FREE_NAME();
 366         return VLC_FALSE;
 367     }
 368     psz_name = xml_ReaderName( p_xml_reader );
 369     if( !psz_name || strcmp( psz_name, "trackList" ) )
 370     {
 371         msg_Err( p_demux, "expected: </trackList>, found: </%s>", psz_name );
 372         FREE_NAME();
 373         return VLC_FALSE;
 374     }
 375     FREE_NAME();
 376
 377     msg_Dbg( p_demux, "parsed %i tracks successfully", i_ntracks );
 378
 379     return VLC_TRUE;
 380 }
 381
 382 /**
 383  * \brief parse one track element
 384  * \param COMPLEX_INTERFACE
 385  */
 386 static vlc_bool_t parse_track_node COMPLEX_INTERFACE
 387 {
 388     input_item_t *p_new_input = NULL;
 389     int i_node;
 390     char *psz_name=NULL;
 391     char *psz_value=NULL;
 392     xml_elem_hnd_t *p_handler=NULL;
 393
 394     xml_elem_hnd_t track_elements[] =
 395         { {"location",     SIMPLE_CONTENT,  {NULL} },
 396           {"identifier",   SIMPLE_CONTENT,  {NULL} },
 397           {"title",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 398           {"creator",      SIMPLE_CONTENT,  {.smpl = set_item_info} },
 399           {"annotation",   SIMPLE_CONTENT,  {.smpl = set_item_info} },
 400           {"info",         SIMPLE_CONTENT,  {NULL} },
 401           {"image",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 402           {"album",        SIMPLE_CONTENT,  {.smpl = set_item_info} },
 403           {"trackNum",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 404           {"duration",     SIMPLE_CONTENT,  {.smpl = set_item_info} },
 405           {"link",         SIMPLE_CONTENT,  {NULL} },
 406           {"meta",         SIMPLE_CONTENT,  {NULL} },
 407           {"extension",    COMPLEX_CONTENT, {.cmplx = skip_element} },
 408           {NULL,           UNKNOWN_CONTENT, {NULL} }
 409         };
 410
 411     while( xml_ReaderRead( p_xml_reader ) == 1 )
 412     {
 413         i_node = xml_ReaderNodeType( p_xml_reader );
 414         switch( i_node )
 415         {
 416             case XML_READER_NONE:
 417                 break;
 418
 419             case XML_READER_STARTELEM:
 420                 /*  element start tag  */
 421                 psz_name = xml_ReaderName( p_xml_reader );
 422                 if( !psz_name || !*psz_name )
 423                 {
 424                     msg_Err( p_demux, "invalid xml stream" );
 425                     FREE_ATT();
 426                     return VLC_FALSE;
 427                 }
 428                 /* choose handler */
 429                 for( p_handler = track_elements;
 430                      p_handler->name && strcmp( psz_name, p_handler->name );
 431                      p_handler++ );
 432                 if( !p_handler->name )
 433                 {
 434                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 435                     FREE_ATT();
 436                     return VLC_FALSE;
 437                 }
 438                 FREE_NAME();
 439                 /* complex content is parsed in a separate function */
 440                 if( p_handler->type == COMPLEX_CONTENT )
 441                 {
 442                     if( !p_new_input )
 443                     {
 444                         msg_Err( p_demux,
 445                                  "at <%s> level no new item has been allocated",
 446                                  p_handler->name );
 447                         FREE_ATT();
 448                         return VLC_FALSE;
 449                     }
 450                     if( p_handler->pf_handler.cmplx( p_demux,
 451                                                      p_playlist,
 452                                                      p_new_input,
 453                                                      p_xml_reader,
 454                                                      p_handler->name ) )
 455                     {
 456                         p_handler = NULL;
 457                         FREE_ATT();
 458                     }
 459                     else
 460                     {
 461                         FREE_ATT();
 462                         return VLC_FALSE;
 463                     }
 464                 }
 465                 break;
 466
 467             case XML_READER_TEXT:
 468                 /* simple element content */
 469                 FREE_ATT();
 470                 psz_value = xml_ReaderValue( p_xml_reader );
 471                 if( !psz_value )
 472                 {
 473                     msg_Err( p_demux, "invalid xml stream" );
 474                     FREE_ATT();
 475                     return VLC_FALSE;
 476                 }
 477                 break;
 478
 479             case XML_READER_ENDELEM:
 480                 /* element end tag */
 481                 psz_name = xml_ReaderName( p_xml_reader );
 482                 if( !psz_name )
 483                 {
 484                     msg_Err( p_demux, "invalid xml stream" );
 485                     FREE_ATT();
 486                     return VLC_FALSE;
 487                 }
 488                 /* leave if the current parent node <track> is terminated */
 489                 if( !strcmp( psz_name, psz_element ) )
 490                 {
 491                     FREE_ATT();
 492                     if( p_demux->p_sys->i_identifier <
 493                         p_demux->p_sys->i_tracklist_entries )
 494                     {
 495                         p_demux->p_sys->pp_tracklist[
 496                             p_demux->p_sys->i_identifier ] = p_new_input;
 497                     }
 498                     else
 499                     {
 500                         if( p_demux->p_sys->i_identifier >
 501                             p_demux->p_sys->i_tracklist_entries )
 502                         {
 503                             p_demux->p_sys->i_tracklist_entries =
 504                                 p_demux->p_sys->i_identifier;
 505                         }
 506                         INSERT_ELEM( p_demux->p_sys->pp_tracklist,
 507                                      p_demux->p_sys->i_tracklist_entries,
 508                                      p_demux->p_sys->i_tracklist_entries,
 509                                      p_new_input );
 510                     }
 511                     return VLC_TRUE;
 512                 }
 513                 /* there MUST have been a start tag for that element name */
 514                 if( !p_handler || !p_handler->name
 515                     || strcmp( p_handler->name, psz_name ))
 516                 {
 517                     msg_Err( p_demux, "there's no open element left for <%s>",
 518                              psz_name );
 519                     FREE_ATT();
 520                     return VLC_FALSE;
 521                 }
 522
 523                 /* special case: location */
 524                 if( !strcmp( p_handler->name, "location" ) )
 525                 {
 526                     char *psz_uri=NULL;
 527                     /* there MUST NOT be an item */
 528                     if( p_new_input )
 529                     {
 530                         msg_Err( p_demux, "item <%s> already created",
 531                                  psz_name );
 532                         FREE_ATT();
 533                         return VLC_FALSE;
 534                     }
 535                     psz_uri = decode_URI_duplicate( psz_value );
 536
 537                     if( psz_uri )
 538                     {
 539                         if( p_demux->p_sys->psz_base &&
 540                             !strstr( psz_uri, "://" ) )
 541                         {
 542                            char* psz_tmp = malloc(
 543                                    strlen(p_demux->p_sys->psz_base) +
 544                                    strlen(psz_uri) +1 );
 545                            if( !psz_tmp )
 546                            {
 547                                msg_Err( p_demux, "out of memory");
 548                                return VLC_FALSE;
 549                            }
 550                            sprintf( psz_tmp, "%s%s",
 551                                     p_demux->p_sys->psz_base, psz_uri );
 552                            free( psz_uri );
 553                            psz_uri = psz_tmp;
 554                         }
 555                         p_new_input = input_ItemNewExt( p_playlist, psz_uri,
 556                                                         NULL, 0, NULL, -1 );
 557                         free( psz_uri );
 558                         input_ItemCopyOptions( p_input_item, p_new_input );
 559                         psz_uri = NULL;
 560                         FREE_ATT();
 561                         p_handler = NULL;
 562                     }
 563                     else
 564                     {
 565                         FREE_ATT();
 566                         return VLC_FALSE;
 567                     }
 568                 }
 569                 else if( !strcmp( p_handler->name, "identifier" ) )
 570                 {
 571                     p_demux->p_sys->i_identifier = atoi( psz_value );
 572                 }
 573                 else
 574                 {
 575                     /* there MUST be an item */
 576                     if( !p_new_input )
 577                     {
 578                         msg_Err( p_demux, "item not yet created at <%s>",
 579                                  psz_name );
 580                         FREE_ATT();
 581                         return VLC_FALSE;
 582                     }
 583                     if( p_handler->pf_handler.smpl )
 584                     {
 585                         p_handler->pf_handler.smpl( p_new_input,
 586                                                     p_handler->name,
 587                                                     psz_value );
 588                         FREE_ATT();
 589                     }
 590                 }
 591                 FREE_ATT();
 592                 p_handler = NULL;
 593                 break;
 594
 595             default:
 596                 /* unknown/unexpected xml node */
 597                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 598                 FREE_ATT();
 599                 return VLC_FALSE;
 600         }
 601         FREE_NAME();
 602     }
 603     msg_Err( p_demux, "unexpected end of xml data" );
 604     FREE_ATT();
 605     return VLC_FALSE;
 606 }
 607
 608 /**
 609  * \brief handles the supported <track> sub-elements
 610  */
 611 static vlc_bool_t set_item_info SIMPLE_INTERFACE
 612 {
 613     /* exit if setting is impossible */
 614     if( !psz_name || !psz_value || !p_input )
 615         return VLC_FALSE;
 616
 617
 618     /* re-convert xml special characters inside psz_value */
 619     resolve_xml_special_chars( psz_value );
 620
 621     /* handle each info element in a separate "if" clause */
 622     if( !strcmp( psz_name, "title" ) )
 623     {
 624         input_item_SetTitle( p_input, psz_value );
 625     }
 626     else if( !strcmp( psz_name, "creator" ) )
 627     {
 628         input_item_SetArtist( p_input, psz_value );
 629     }
 630     else if( !strcmp( psz_name, "album" ) )
 631     {
 632         input_item_SetAlbum( p_input, psz_value );
 633
 634     }
 635     else if( !strcmp( psz_name, "trackNum" ) )
 636     {
 637         input_item_SetTrackNum( p_input, psz_value );
 638     }
 639     else if( !strcmp( psz_name, "duration" ) )
 640     {
 641         long i_num = atol( psz_value );
 642         input_item_SetDuration( p_input, (mtime_t) i_num*1000 );
 643     }
 644     else if( !strcmp( psz_name, "annotation" ) )
 645     {
 646         input_item_SetDescription( p_input, psz_value );
 647     }
 648     else if( !strcmp( psz_name, "image" ) )
 649     {
 650         char *psz_uri = decode_URI_duplicate( psz_value );
 651         input_item_SetArtURL( p_input, psz_uri );
 652         free( psz_uri );
 653     }
 654     return VLC_TRUE;
 655 }
 656
 657
 658 /**
 659  * \brief parse the extension node of a XSPF playlist
 660  */
 661 static vlc_bool_t parse_extension_node COMPLEX_INTERFACE
 662 {
 663     char *psz_name = NULL;
 664     char *psz_value = NULL;
 665     char *psz_title = NULL;
 666     char *psz_application = NULL;
 667     int i_node;
 668     xml_elem_hnd_t *p_handler = NULL;
 669     input_item_t *p_new_input = NULL;
 670
 671     xml_elem_hnd_t pl_elements[] =
 672         { {"node",  COMPLEX_CONTENT, {.cmplx = parse_extension_node} },
 673           {"item",  COMPLEX_CONTENT, {.cmplx = parse_extitem_node} },
 674           {NULL,    UNKNOWN_CONTENT, {NULL} }
 675         };
 676
 677     /* read all extension node attributes */
 678     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 679     {
 680         psz_name = xml_ReaderName( p_xml_reader );
 681         psz_value = xml_ReaderValue( p_xml_reader );
 682         if( !psz_name || !psz_value )
 683         {
 684             msg_Err( p_demux, "invalid xml stream @ <node>" );
 685             FREE_ATT();
 686             return VLC_FALSE;
 687         }
 688         /* attribute: title */
 689         if( !strcmp( psz_name, "title" ) )
 690         {
 691             resolve_xml_special_chars( psz_value );
 692             psz_title = strdup( psz_value );
 693         }
 694         /* extension attribute: application */
 695         else if( !strcmp( psz_name, "application" ) )
 696         {
 697             psz_application = strdup( psz_value );
 698         }
 699         /* unknown attribute */
 700         else
 701             msg_Warn( p_demux, "invalid <%s> attribute:\"%s\"", psz_element, psz_name );
 702
 703         FREE_ATT();
 704     }
 705
 706     /* attribute title is mandatory except for <extension> */
 707     if( !strcmp( psz_element, "node" ) )
 708     {
 709         if( !psz_title )
 710         {
 711             msg_Warn( p_demux, "<node> requires \"title\" attribute" );
 712             return VLC_FALSE;
 713         }
 714         p_new_input = input_ItemNewWithType( VLC_OBJECT( p_playlist ), "vlc:skip",
 715                                 psz_title, 0, NULL, -1, ITEM_TYPE_DIRECTORY );
 716         if( p_new_input )
 717         {
 718             input_ItemAddSubItem( p_input_item, p_new_input );
 719             p_input_item = p_new_input;
 720         }
 721         free( psz_title );
 722     }
 723     else if( !strcmp( psz_element, "extension" ) )
 724     {
 725         if( !psz_application )
 726         {
 727             msg_Warn( p_demux, "<extension> requires \"application\" attribute" );
 728             return VLC_FALSE;
 729         }
 730         else if( strcmp( psz_application, "http://www.videolan.org/vlc/playlist/0" ) )
 731         {
 732             msg_Dbg( p_demux, "Skipping \"%s\" extension tag", psz_application );
 733             free( psz_application );
 734             return VLC_FALSE;
 735         }
 736     }
 737     free( psz_application );
 738
 739     /* parse the child elements */
 740     while( xml_ReaderRead( p_xml_reader ) == 1 )
 741     {
 742         i_node = xml_ReaderNodeType( p_xml_reader );
 743         switch( i_node )
 744         {
 745             case XML_READER_NONE:
 746                 break;
 747             case XML_READER_STARTELEM:
 748                 /*  element start tag  */
 749                 psz_name = xml_ReaderName( p_xml_reader );
 750                 if( !psz_name || !*psz_name )
 751                 {
 752                     msg_Err( p_demux, "invalid xml stream" );
 753                     FREE_ATT();
 754                     return VLC_FALSE;
 755                 }
 756                 /* choose handler */
 757                 for( p_handler = pl_elements;
 758                      p_handler->name && strcmp( psz_name, p_handler->name );
 759                      p_handler++ );
 760                 if( !p_handler->name )
 761                 {
 762                     msg_Err( p_demux, "unexpected element <%s>", psz_name );
 763                     FREE_ATT();
 764                     return VLC_FALSE;
 765                 }
 766                 FREE_NAME();
 767                 /* complex content is parsed in a separate function */
 768                 if( p_handler->type == COMPLEX_CONTENT )
 769                 {
 770                     if( p_handler->pf_handler.cmplx( p_demux,
 771                                                      p_playlist,
 772                                                      p_input_item,
 773                                                      p_xml_reader,
 774                                                      p_handler->name ) )
 775                     {
 776                         p_handler = NULL;
 777                         FREE_ATT();
 778                     }
 779                     else
 780                     {
 781                         FREE_ATT();
 782                         return VLC_FALSE;
 783                     }
 784                 }
 785                 break;
 786
 787             case XML_READER_TEXT:
 788                 /* simple element content */
 789                 FREE_ATT();
 790                 psz_value = xml_ReaderValue( p_xml_reader );
 791                 if( !psz_value )
 792                 {
 793                     msg_Err( p_demux, "invalid xml stream" );
 794                     FREE_ATT();
 795                     return VLC_FALSE;
 796                 }
 797                 break;
 798
 799             case XML_READER_ENDELEM:
 800                 /* element end tag */
 801                 psz_name = xml_ReaderName( p_xml_reader );
 802                 if( !psz_name )
 803                 {
 804                     msg_Err( p_demux, "invalid xml stream" );
 805                     FREE_ATT();
 806                     return VLC_FALSE;
 807                 }
 808                 /* leave if the current parent node is terminated */
 809                 if( !strcmp( psz_name, psz_element ) )
 810                 {
 811                     FREE_ATT();
 812                     return VLC_TRUE;
 813                 }
 814                 /* there MUST have been a start tag for that element name */
 815                 if( !p_handler || !p_handler->name
 816                     || strcmp( p_handler->name, psz_name ))
 817                 {
 818                     msg_Err( p_demux, "there's no open element left for <%s>",
 819                              psz_name );
 820                     FREE_ATT();
 821                     return VLC_FALSE;
 822                 }
 823
 824                 if( p_handler->pf_handler.smpl )
 825                 {
 826                     p_handler->pf_handler.smpl( p_input_item, p_handler->name,
 827                                                 psz_value );
 828                 }
 829                 FREE_ATT();
 830                 p_handler = NULL;
 831                 break;
 832
 833             default:
 834                 /* unknown/unexpected xml node */
 835                 msg_Err( p_demux, "unexpected xml node %i", i_node );
 836                 FREE_ATT();
 837                 return VLC_FALSE;
 838         }
 839         FREE_NAME();
 840     }
 841     return VLC_FALSE;
 842 }
 843
 844 /**
 845  * \brief parse the extension item node of a XSPF playlist
 846  */
 847 static vlc_bool_t parse_extitem_node COMPLEX_INTERFACE
 848 {
 849     input_item_t *p_new_input = NULL;
 850     char *psz_name = NULL;
 851     char *psz_value = NULL;
 852     int i_href = -1;
 853
 854     /* read all extension item attributes */
 855     while( xml_ReaderNextAttr( p_xml_reader ) == VLC_SUCCESS )
 856     {
 857         psz_name = xml_ReaderName( p_xml_reader );
 858         psz_value = xml_ReaderValue( p_xml_reader );
 859         if( !psz_name || !psz_value )
 860         {
 861             msg_Err( p_demux, "invalid xml stream @ <item>" );
 862             FREE_ATT();
 863             return VLC_FALSE;
 864         }
 865         /* attribute: href */
 866         if( !strcmp( psz_name, "href" ) )
 867         {
 868             i_href = atoi( psz_value );
 869         }
 870         /* unknown attribute */
 871         else
 872             msg_Warn( p_demux, "invalid <item> attribute:\"%s\"", psz_name);
 873
 874         FREE_ATT();
 875     }
 876
 877     /* attribute href is mandatory */
 878     if( i_href < 0 )
 879     {
 880         msg_Warn( p_demux, "<item> requires \"href\" attribute" );
 881         return VLC_FALSE;
 882     }
 883
 884     if( i_href >= p_demux->p_sys->i_tracklist_entries )
 885     {
 886         msg_Warn( p_demux, "invalid \"href\" attribute" );
 887         return VLC_FALSE;
 888     }
 889
 890     p_new_input = p_demux->p_sys->pp_tracklist[ i_href ];
 891     if( p_new_input )
 892     {
 893         input_ItemAddSubItem( p_input_item, p_new_input );
 894         p_demux->p_sys->pp_tracklist[i_href] = NULL;
 895     }
 896
 897     /* kludge for #1293 - XTAG sends ENDELEM for self closing tag */
 898     /* (libxml sends NONE) */
 899     xml_ReaderRead( p_xml_reader );
 900
 901     return VLC_TRUE;
 902 }
 903
 904 /**
 905  * \brief skips complex element content that we can't manage
 906  */
 907 static vlc_bool_t skip_element COMPLEX_INTERFACE
 908 {
 909     char *psz_endname;
 910
 911     while( xml_ReaderRead( p_xml_reader ) == 1 )
 912     {
 913         if( xml_ReaderNodeType( p_xml_reader ) == XML_READER_ENDELEM )
 914         {
 915             psz_endname = xml_ReaderName( p_xml_reader );
 916             if( !psz_endname )
 917                 return VLC_FALSE;
 918             if( !strcmp( psz_element, psz_endname ) )
 919             {
 920                 free( psz_endname );
 921                 return VLC_TRUE;
 922             }
 923             else
 924                 free( psz_endname );
 925         }
 926     }
 927     return VLC_FALSE;
 928 }