dlls/msi/where.c

   1 /*
   2  * Implementation of the Microsoft Installer (msi.dll)
   3  *
   4  * Copyright 2002 Mike McCormack for CodeWeavers
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  */
  20
  21 #include <stdarg.h>
  22
  23 #include "windef.h"
  24 #include "winbase.h"
  25 #include "winerror.h"
  26 #include "wine/debug.h"
  27 #include "msi.h"
  28 #include "msiquery.h"
  29 #include "objbase.h"
  30 #include "objidl.h"
  31 #include "msipriv.h"
  32 #include "winnls.h"
  33
  34 #include "query.h"
  35
  36 WINE_DEFAULT_DEBUG_CHANNEL(msidb);
  37
  38
  39 /* below is the query interface to a table */
  40
  41 typedef struct tagMSIWHEREVIEW
  42 {
  43     MSIVIEW        view;
  44     MSIDATABASE   *db;
  45     MSIVIEW       *table;
  46     UINT           row_count;
  47     UINT          *reorder;
  48     struct expr   *cond;
  49 } MSIWHEREVIEW;
  50
  51 static UINT WHERE_fetch_int( struct tagMSIVIEW *view, UINT row, UINT col, UINT *val )
  52 {
  53     MSIWHEREVIEW *wv = (MSIWHEREVIEW*)view;
  54
  55     TRACE("%p %d %d %p\n", wv, row, col, val );
  56
  57     if( !wv->table )
  58         return ERROR_FUNCTION_FAILED;
  59
  60     if( row > wv->row_count )
  61         return ERROR_NO_MORE_ITEMS;
  62
  63     row = wv->reorder[ row ];
  64
  65     return wv->table->ops->fetch_int( wv->table, row, col, val );
  66 }
  67
  68 static UINT WHERE_fetch_stream( struct tagMSIVIEW *view, UINT row, UINT col, IStream **stm )
  69 {
  70     MSIWHEREVIEW *wv = (MSIWHEREVIEW*)view;
  71
  72     TRACE("%p %d %d %p\n", wv, row, col, stm );
  73
  74     if( !wv->table )
  75         return ERROR_FUNCTION_FAILED;
  76
  77     if( row > wv->row_count )
  78         return ERROR_NO_MORE_ITEMS;
  79
  80     row = wv->reorder[ row ];
  81
  82     return wv->table->ops->fetch_stream( wv->table, row, col, stm );
  83 }
  84
  85 static UINT WHERE_set_int( struct tagMSIVIEW *view, UINT row, UINT col, UINT val )
  86 {
  87     MSIWHEREVIEW *wv = (MSIWHEREVIEW*)view;
  88
  89     TRACE("%p %d %d %04x\n", wv, row, col, val );
  90
  91     if( !wv->table )
  92          return ERROR_FUNCTION_FAILED;
  93
  94     if( row > wv->row_count )
  95         return ERROR_NO_MORE_ITEMS;
  96
  97     row = wv->reorder[ row ];
  98
  99     return wv->table->ops->set_int( wv->table, row, col, val );
 100 }
 101
 102 static UINT INT_evaluate( UINT lval, UINT op, UINT rval )
 103 {
 104     switch( op )
 105     {
 106     case OP_EQ:
 107         return ( lval == rval );
 108     case OP_AND:
 109         return ( lval && rval );
 110     case OP_OR:
 111         return ( lval || rval );
 112     case OP_GT:
 113         return ( lval > rval );
 114     case OP_LT:
 115         return ( lval < rval );
 116     case OP_LE:
 117         return ( lval <= rval );
 118     case OP_GE:
 119         return ( lval >= rval );
 120     case OP_NE:
 121         return ( lval != rval );
 122     case OP_ISNULL:
 123         return ( !lval );
 124     case OP_NOTNULL:
 125         return ( lval );
 126     default:
 127         ERR("Unknown operator %d\n", op );
 128     }
 129     return 0;
 130 }
 131
 132 static const WCHAR *STRING_evaluate( string_table *st,
 133               MSIVIEW *table, UINT row, struct expr *expr, MSIRECORD *record )
 134 {
 135     UINT val = 0, r;
 136
 137     switch( expr->type )
 138     {
 139     case EXPR_COL_NUMBER_STRING:
 140         r = table->ops->fetch_int( table, row, expr->u.col_number, &val );
 141         if( r != ERROR_SUCCESS )
 142             return NULL;
 143         return msi_string_lookup_id( st, val );
 144
 145     case EXPR_SVAL:
 146         return expr->u.sval;
 147
 148     case EXPR_WILDCARD:
 149         return MSI_RecordGetString( record, 1 );
 150
 151     default:
 152         ERR("Invalid expression type\n");
 153         break;
 154     }
 155     return NULL;
 156 }
 157
 158 static UINT STRCMP_Evaluate( string_table *st, MSIVIEW *table, UINT row,
 159                              struct expr *cond, UINT *val, MSIRECORD *record )
 160 {
 161     int sr;
 162     const WCHAR *l_str, *r_str;
 163
 164     l_str = STRING_evaluate( st, table, row, cond->u.expr.left, record );
 165     r_str = STRING_evaluate( st, table, row, cond->u.expr.right, record );
 166     if( l_str == r_str )
 167         sr = 0;
 168     else if( l_str && ! r_str )
 169         sr = 1;
 170     else if( r_str && ! l_str )
 171         sr = -1;
 172     else
 173         sr = lstrcmpW( l_str, r_str );
 174
 175     *val = ( cond->u.expr.op == OP_EQ && ( sr == 0 ) ) ||
 176            ( cond->u.expr.op == OP_LT && ( sr < 0 ) ) ||
 177            ( cond->u.expr.op == OP_GT && ( sr > 0 ) );
 178
 179     return ERROR_SUCCESS;
 180 }
 181
 182 static UINT WHERE_evaluate( MSIDATABASE *db, MSIVIEW *table, UINT row,
 183                              struct expr *cond, UINT *val, MSIRECORD *record )
 184 {
 185     UINT r, lval, rval;
 186
 187     if( !cond )
 188         return ERROR_SUCCESS;
 189
 190     switch( cond->type )
 191     {
 192     case EXPR_COL_NUMBER_STRING:
 193     case EXPR_COL_NUMBER:
 194         return table->ops->fetch_int( table, row, cond->u.col_number, val );
 195
 196     case EXPR_UVAL:
 197         *val = cond->u.uval;
 198         return ERROR_SUCCESS;
 199
 200     case EXPR_COMPLEX:
 201         r = WHERE_evaluate( db, table, row, cond->u.expr.left, &lval, record );
 202         if( r != ERROR_SUCCESS )
 203             return r;
 204         r = WHERE_evaluate( db, table, row, cond->u.expr.right, &rval, record );
 205         if( r != ERROR_SUCCESS )
 206             return r;
 207         *val = INT_evaluate( lval, cond->u.expr.op, rval );
 208         return ERROR_SUCCESS;
 209
 210     case EXPR_STRCMP:
 211         return STRCMP_Evaluate( db->strings, table, row, cond, val, record );
 212
 213     case EXPR_WILDCARD:
 214         *val = MSI_RecordGetInteger( record, 1 );
 215         return ERROR_SUCCESS;
 216
 217     default:
 218         ERR("Invalid expression type\n");
 219         break;
 220     }
 221
 222     return ERROR_SUCCESS;
 223
 224 }
 225
 226 static UINT WHERE_execute( struct tagMSIVIEW *view, MSIRECORD *record )
 227 {
 228     MSIWHEREVIEW *wv = (MSIWHEREVIEW*)view;
 229     UINT count = 0, r, val, i;
 230     MSIVIEW *table = wv->table;
 231
 232     TRACE("%p %p\n", wv, record);
 233
 234     if( !table )
 235          return ERROR_FUNCTION_FAILED;
 236
 237     r = table->ops->execute( table, record );
 238     if( r != ERROR_SUCCESS )
 239         return r;
 240
 241     r = table->ops->get_dimensions( table, &count, NULL );
 242     if( r != ERROR_SUCCESS )
 243         return r;
 244
 245     msi_free( wv->reorder );
 246     wv->reorder = msi_alloc( count*sizeof(UINT) );
 247     if( !wv->reorder )
 248         return ERROR_FUNCTION_FAILED;
 249
 250     wv->row_count = 0;
 251     for( i=0; i<count; i++ )
 252     {
 253         val = 0;
 254         r = WHERE_evaluate( wv->db, table, i, wv->cond, &val, record );
 255         if( r != ERROR_SUCCESS )
 256             return r;
 257         if( val )
 258             wv->reorder[ wv->row_count ++ ] = i;
 259     }
 260
 261     return ERROR_SUCCESS;
 262 }
 263
 264 static UINT WHERE_close( struct tagMSIVIEW *view )
 265 {
 266     MSIWHEREVIEW *wv = (MSIWHEREVIEW*)view;
 267
 268     TRACE("%p\n", wv );
 269
 270     if( !wv->table )
 271          return ERROR_FUNCTION_FAILED;
 272
 273     msi_free( wv->reorder );
 274     wv->reorder = NULL;
 275
 276     return wv->table->ops->close( wv->table );
 277 }
 278
 279 static UINT WHERE_get_dimensions( struct tagMSIVIEW *view, UINT *rows, UINT *cols )
 280 {
 281     MSIWHEREVIEW *wv = (MSIWHEREVIEW*)view;
 282
 283     TRACE("%p %p %p\n", wv, rows, cols );
 284
 285     if( !wv->table )
 286          return ERROR_FUNCTION_FAILED;
 287
 288     if( rows )
 289     {
 290         if( !wv->reorder )
 291             return ERROR_FUNCTION_FAILED;
 292         *rows = wv->row_count;
 293     }
 294
 295     return wv->table->ops->get_dimensions( wv->table, NULL, cols );
 296 }
 297
 298 static UINT WHERE_get_column_info( struct tagMSIVIEW *view,
 299                 UINT n, LPWSTR *name, UINT *type )
 300 {
 301     MSIWHEREVIEW *wv = (MSIWHEREVIEW*)view;
 302
 303     TRACE("%p %d %p %p\n", wv, n, name, type );
 304
 305     if( !wv->table )
 306          return ERROR_FUNCTION_FAILED;
 307
 308     return wv->table->ops->get_column_info( wv->table, n, name, type );
 309 }
 310
 311 static UINT WHERE_modify( struct tagMSIVIEW *view, MSIMODIFY eModifyMode,
 312                 MSIRECORD *rec )
 313 {
 314     MSIWHEREVIEW *wv = (MSIWHEREVIEW*)view;
 315
 316     TRACE("%p %d %p\n", wv, eModifyMode, rec );
 317
 318     if( !wv->table )
 319          return ERROR_FUNCTION_FAILED;
 320
 321     return wv->table->ops->modify( wv->table, eModifyMode, rec );
 322 }
 323
 324 static UINT WHERE_delete( struct tagMSIVIEW *view )
 325 {
 326     MSIWHEREVIEW *wv = (MSIWHEREVIEW*)view;
 327
 328     TRACE("%p\n", wv );
 329
 330     if( wv->table )
 331         wv->table->ops->delete( wv->table );
 332     wv->table = 0;
 333
 334     msi_free( wv->reorder );
 335     wv->reorder = NULL;
 336     wv->row_count = 0;
 337
 338     msiobj_release( &wv->db->hdr );
 339     msi_free( wv );
 340
 341     return ERROR_SUCCESS;
 342 }
 343
 344
 345 MSIVIEWOPS where_ops =
 346 {
 347     WHERE_fetch_int,
 348     WHERE_fetch_stream,
 349     WHERE_set_int,
 350     NULL,
 351     WHERE_execute,
 352     WHERE_close,
 353     WHERE_get_dimensions,
 354     WHERE_get_column_info,
 355     WHERE_modify,
 356     WHERE_delete
 357 };
 358
 359 static UINT WHERE_VerifyCondition( MSIDATABASE *db, MSIVIEW *table, struct expr *cond,
 360                                    UINT *valid )
 361 {
 362     UINT r, val = 0;
 363
 364     switch( cond->type )
 365     {
 366     case EXPR_COLUMN:
 367         r = VIEW_find_column( table, cond->u.column, &val );
 368         if( r == ERROR_SUCCESS )
 369         {
 370             UINT type = 0;
 371             r = table->ops->get_column_info( table, val, NULL, &type );
 372             if( r == ERROR_SUCCESS )
 373             {
 374                 if (type&MSITYPE_STRING)
 375                     cond->type = EXPR_COL_NUMBER_STRING;
 376                 else
 377                     cond->type = EXPR_COL_NUMBER;
 378                 cond->u.col_number = val;
 379                 *valid = 1;
 380             }
 381             else
 382                 *valid = 0;
 383         }
 384         else
 385         {
 386             *valid = 0;
 387             ERR("Couldn't find column %s\n", debugstr_w( cond->u.column ) );
 388         }
 389         break;
 390     case EXPR_COMPLEX:
 391         r = WHERE_VerifyCondition( db, table, cond->u.expr.left, valid );
 392         if( r != ERROR_SUCCESS )
 393             return r;
 394         if( !*valid )
 395             return ERROR_SUCCESS;
 396         r = WHERE_VerifyCondition( db, table, cond->u.expr.right, valid );
 397         if( r != ERROR_SUCCESS )
 398             return r;
 399
 400         /* check the type of the comparison */
 401         if( ( cond->u.expr.left->type == EXPR_SVAL ) ||
 402             ( cond->u.expr.left->type == EXPR_COL_NUMBER_STRING ) ||
 403             ( cond->u.expr.right->type == EXPR_SVAL ) ||
 404             ( cond->u.expr.right->type == EXPR_COL_NUMBER_STRING ) )
 405         {
 406             switch( cond->u.expr.op )
 407             {
 408             case OP_EQ:
 409             case OP_GT:
 410             case OP_LT:
 411                 break;
 412             default:
 413                 *valid = FALSE;
 414                 return ERROR_INVALID_PARAMETER;
 415             }
 416
 417             /* FIXME: check we're comparing a string to a column */
 418
 419             cond->type = EXPR_STRCMP;
 420         }
 421
 422         break;
 423     case EXPR_IVAL:
 424         *valid = 1;
 425         cond->type = EXPR_UVAL;
 426         cond->u.uval = cond->u.ival + (1<<15);
 427         break;
 428     case EXPR_WILDCARD:
 429         *valid = 1;
 430         break;
 431     case EXPR_SVAL:
 432         *valid = 1;
 433         break;
 434     default:
 435         ERR("Invalid expression type\n");
 436         *valid = 0;
 437         break;
 438     }
 439
 440     return ERROR_SUCCESS;
 441 }
 442
 443 UINT WHERE_CreateView( MSIDATABASE *db, MSIVIEW **view, MSIVIEW *table,
 444                        struct expr *cond )
 445 {
 446     MSIWHEREVIEW *wv = NULL;
 447     UINT count = 0, r, valid = 0;
 448
 449     TRACE("%p\n", table );
 450
 451     r = table->ops->get_dimensions( table, NULL, &count );
 452     if( r != ERROR_SUCCESS )
 453     {
 454         ERR("can't get table dimensions\n");
 455         return r;
 456     }
 457
 458     if( cond )
 459     {
 460         r = WHERE_VerifyCondition( db, table, cond, &valid );
 461         if( r != ERROR_SUCCESS )
 462             return r;
 463         if( !valid )
 464             return ERROR_FUNCTION_FAILED;
 465     }
 466
 467     wv = msi_alloc_zero( sizeof *wv );
 468     if( !wv )
 469         return ERROR_FUNCTION_FAILED;
 470
 471     /* fill the structure */
 472     wv->view.ops = &where_ops;
 473     msiobj_addref( &db->hdr );
 474     wv->db = db;
 475     wv->table = table;
 476     wv->row_count = 0;
 477     wv->reorder = NULL;
 478     wv->cond = cond;
 479     *view = (MSIVIEW*) wv;
 480
 481     return ERROR_SUCCESS;
 482 }