dlls/msi/distinct.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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, 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 typedef struct tagDISTINCTSET
  39 {
  40     UINT val;
  41     UINT count;
  42     UINT row;
  43     struct tagDISTINCTSET *nextrow;
  44     struct tagDISTINCTSET *nextcol;
  45 } DISTINCTSET;
  46
  47 typedef struct tagMSIDISTINCTVIEW
  48 {
  49     MSIVIEW        view;
  50     MSIDATABASE   *db;
  51     MSIVIEW       *table;
  52     UINT           row_count;
  53     UINT          *translation;
  54 } MSIDISTINCTVIEW;
  55
  56 static DISTINCTSET ** distinct_insert( DISTINCTSET **x, UINT val, UINT row )
  57 {
  58     /* horrible O(n) find */
  59     while( *x )
  60     {
  61         if( (*x)->val == val )
  62         {
  63             (*x)->count++;
  64             return x;
  65         }
  66         x = &(*x)->nextrow;
  67     }
  68
  69     /* nothing found, so add one */
  70     *x = msi_alloc( sizeof (DISTINCTSET) );
  71     if( *x )
  72     {
  73         (*x)->val = val;
  74         (*x)->count = 1;
  75         (*x)->row = row;
  76         (*x)->nextrow = NULL;
  77         (*x)->nextcol = NULL;
  78     }
  79     return x;
  80 }
  81
  82 static void distinct_free( DISTINCTSET *x )
  83 {
  84     while( x )
  85     {
  86         DISTINCTSET *next = x->nextrow;
  87         distinct_free( x->nextcol );
  88         msi_free( x );
  89         x = next;
  90     }
  91 }
  92
  93 static UINT DISTINCT_fetch_int( struct tagMSIVIEW *view, UINT row, UINT col, UINT *val )
  94 {
  95     MSIDISTINCTVIEW *dv = (MSIDISTINCTVIEW*)view;
  96
  97     TRACE("%p %d %d %p\n", dv, row, col, val );
  98
  99     if( !dv->table )
 100         return ERROR_FUNCTION_FAILED;
 101
 102     if( row >= dv->row_count )
 103         return ERROR_INVALID_PARAMETER;
 104
 105     row = dv->translation[ row ];
 106
 107     return dv->table->ops->fetch_int( dv->table, row, col, val );
 108 }
 109
 110 static UINT DISTINCT_execute( struct tagMSIVIEW *view, MSIRECORD *record )
 111 {
 112     MSIDISTINCTVIEW *dv = (MSIDISTINCTVIEW*)view;
 113     UINT r, i, j, r_count, c_count;
 114     DISTINCTSET *rowset = NULL;
 115
 116     TRACE("%p %p\n", dv, record);
 117
 118     if( !dv->table )
 119          return ERROR_FUNCTION_FAILED;
 120
 121     r = dv->table->ops->execute( dv->table, record );
 122     if( r != ERROR_SUCCESS )
 123         return r;
 124
 125     r = dv->table->ops->get_dimensions( dv->table, &r_count, &c_count );
 126     if( r != ERROR_SUCCESS )
 127         return r;
 128
 129     dv->translation = msi_alloc( r_count*sizeof(UINT) );
 130     if( !dv->translation )
 131         return ERROR_FUNCTION_FAILED;
 132
 133     /* build it */
 134     for( i=0; i<r_count; i++ )
 135     {
 136         DISTINCTSET **x = &rowset;
 137
 138         for( j=1; j<=c_count; j++ )
 139         {
 140             UINT val = 0;
 141             r = dv->table->ops->fetch_int( dv->table, i, j, &val );
 142             if( r != ERROR_SUCCESS )
 143             {
 144                 ERR("Failed to fetch int at %d %d\n", i, j );
 145                 distinct_free( rowset );
 146                 return r;
 147             }
 148             x = distinct_insert( x, val, i );
 149             if( !*x )
 150             {
 151                 ERR("Failed to insert at %d %d\n", i, j );
 152                 distinct_free( rowset );
 153                 return ERROR_FUNCTION_FAILED;
 154             }
 155             if( j != c_count )
 156                 x = &(*x)->nextcol;
 157         }
 158
 159         /* check if it was distinct and if so, include it */
 160         if( (*x)->row == i )
 161         {
 162             TRACE("Row %d -> %d\n", dv->row_count, i);
 163             dv->translation[dv->row_count++] = i;
 164         }
 165     }
 166
 167     distinct_free( rowset );
 168
 169     return ERROR_SUCCESS;
 170 }
 171
 172 static UINT DISTINCT_close( struct tagMSIVIEW *view )
 173 {
 174     MSIDISTINCTVIEW *dv = (MSIDISTINCTVIEW*)view;
 175
 176     TRACE("%p\n", dv );
 177
 178     if( !dv->table )
 179          return ERROR_FUNCTION_FAILED;
 180
 181     msi_free( dv->translation );
 182     dv->translation = NULL;
 183     dv->row_count = 0;
 184
 185     return dv->table->ops->close( dv->table );
 186 }
 187
 188 static UINT DISTINCT_get_dimensions( struct tagMSIVIEW *view, UINT *rows, UINT *cols )
 189 {
 190     MSIDISTINCTVIEW *dv = (MSIDISTINCTVIEW*)view;
 191
 192     TRACE("%p %p %p\n", dv, rows, cols );
 193
 194     if( !dv->table )
 195         return ERROR_FUNCTION_FAILED;
 196
 197     if( rows )
 198     {
 199         if( !dv->translation )
 200             return ERROR_FUNCTION_FAILED;
 201         *rows = dv->row_count;
 202     }
 203
 204     return dv->table->ops->get_dimensions( dv->table, NULL, cols );
 205 }
 206
 207 static UINT DISTINCT_get_column_info( struct tagMSIVIEW *view,
 208                 UINT n, LPWSTR *name, UINT *type )
 209 {
 210     MSIDISTINCTVIEW *dv = (MSIDISTINCTVIEW*)view;
 211
 212     TRACE("%p %d %p %p\n", dv, n, name, type );
 213
 214     if( !dv->table )
 215          return ERROR_FUNCTION_FAILED;
 216
 217     return dv->table->ops->get_column_info( dv->table, n, name, type );
 218 }
 219
 220 static UINT DISTINCT_modify( struct tagMSIVIEW *view, MSIMODIFY eModifyMode,
 221                 MSIRECORD *rec )
 222 {
 223     MSIDISTINCTVIEW *dv = (MSIDISTINCTVIEW*)view;
 224
 225     TRACE("%p %d %p\n", dv, eModifyMode, rec );
 226
 227     if( !dv->table )
 228          return ERROR_FUNCTION_FAILED;
 229
 230     return dv->table->ops->modify( dv->table, eModifyMode, rec );
 231 }
 232
 233 static UINT DISTINCT_delete( struct tagMSIVIEW *view )
 234 {
 235     MSIDISTINCTVIEW *dv = (MSIDISTINCTVIEW*)view;
 236
 237     TRACE("%p\n", dv );
 238
 239     if( dv->table )
 240         dv->table->ops->delete( dv->table );
 241
 242     msi_free( dv->translation );
 243     msiobj_release( &dv->db->hdr );
 244     msi_free( dv );
 245
 246     return ERROR_SUCCESS;
 247 }
 248
 249 static UINT DISTINCT_find_matching_rows( struct tagMSIVIEW *view, UINT col,
 250     UINT val, UINT *row, MSIITERHANDLE *handle )
 251 {
 252     MSIDISTINCTVIEW *dv = (MSIDISTINCTVIEW*)view;
 253     UINT r;
 254
 255     TRACE("%p, %d, %u, %p\n", view, col, val, *handle);
 256
 257     if( !dv->table )
 258          return ERROR_FUNCTION_FAILED;
 259
 260     r = dv->table->ops->find_matching_rows( dv->table, col, val, row, handle );
 261
 262     if( *row > dv->row_count )
 263         return ERROR_NO_MORE_ITEMS;
 264
 265     *row = dv->translation[ *row ];
 266
 267     return r;
 268 }
 269
 270
 271 static const MSIVIEWOPS distinct_ops =
 272 {
 273     DISTINCT_fetch_int,
 274     NULL,
 275     NULL,
 276     NULL,
 277     DISTINCT_execute,
 278     DISTINCT_close,
 279     DISTINCT_get_dimensions,
 280     DISTINCT_get_column_info,
 281     DISTINCT_modify,
 282     DISTINCT_delete,
 283     DISTINCT_find_matching_rows,
 284 };
 285
 286 UINT DISTINCT_CreateView( MSIDATABASE *db, MSIVIEW **view, MSIVIEW *table )
 287 {
 288     MSIDISTINCTVIEW *dv = NULL;
 289     UINT count = 0, r;
 290
 291     TRACE("%p\n", dv );
 292
 293     r = table->ops->get_dimensions( table, NULL, &count );
 294     if( r != ERROR_SUCCESS )
 295     {
 296         ERR("can't get table dimensions\n");
 297         return r;
 298     }
 299
 300     dv = msi_alloc_zero( sizeof *dv );
 301     if( !dv )
 302         return ERROR_FUNCTION_FAILED;
 303
 304     /* fill the structure */
 305     dv->view.ops = &distinct_ops;
 306     msiobj_addref( &db->hdr );
 307     dv->db = db;
 308     dv->table = table;
 309     dv->translation = NULL;
 310     dv->row_count = 0;
 311     *view = (MSIVIEW*) dv;
 312
 313     return ERROR_SUCCESS;
 314 }