dlls/msi/string.c

   1 /*
   2  * String Table Functions
   3  *
   4  * Copyright 2002-2004, Mike McCormack for CodeWeavers
   5  * Copyright 2007 Robert Shearman for CodeWeavers
   6  *
   7  * This library is free software; you can redistribute it and/or
   8  * modify it under the terms of the GNU Lesser General Public
   9  * License as published by the Free Software Foundation; either
  10  * version 2.1 of the License, or (at your option) any later version.
  11  *
  12  * This library is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * Lesser General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Lesser General Public
  18  * License along with this library; if not, write to the Free Software
  19  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  20  */
  21
  22 #define COBJMACROS
  23
  24 #include <stdarg.h>
  25 #include <assert.h>
  26
  27 #include "windef.h"
  28 #include "winbase.h"
  29 #include "winerror.h"
  30 #include "wine/debug.h"
  31 #include "wine/unicode.h"
  32 #include "msi.h"
  33 #include "msiquery.h"
  34 #include "objbase.h"
  35 #include "objidl.h"
  36 #include "msipriv.h"
  37 #include "winnls.h"
  38
  39 #include "query.h"
  40
  41 WINE_DEFAULT_DEBUG_CHANNEL(msidb);
  42
  43 #define HASH_SIZE 0x101
  44 #define LONG_STR_BYTES 3
  45
  46 typedef struct _msistring
  47 {
  48     int hash_next;
  49     UINT persistent_refcount;
  50     UINT nonpersistent_refcount;
  51     LPWSTR str;
  52 } msistring;
  53
  54 struct string_table
  55 {
  56     UINT maxcount;         /* the number of strings */
  57     UINT freeslot;
  58     UINT codepage;
  59     int hash[HASH_SIZE];
  60     msistring *strings; /* an array of strings (in the tree) */
  61 };
  62
  63 static UINT msistring_makehash( const WCHAR *str )
  64 {
  65     UINT hash = 0;
  66
  67     if (str==NULL)
  68         return hash;
  69
  70     while( *str )
  71     {
  72         hash ^= *str++;
  73         hash *= 53;
  74         hash = (hash<<5) | (hash>>27);
  75     }
  76     return hash % HASH_SIZE;
  77 }
  78
  79 static string_table *init_stringtable( int entries, UINT codepage )
  80 {
  81     string_table *st;
  82     int i;
  83
  84     if (codepage != CP_ACP && !IsValidCodePage(codepage))
  85     {
  86         ERR("invalid codepage %d\n", codepage);
  87         return NULL;
  88     }
  89
  90     st = msi_alloc( sizeof (string_table) );
  91     if( !st )
  92         return NULL;
  93     if( entries < 1 )
  94         entries = 1;
  95     st->strings = msi_alloc_zero( sizeof (msistring) * entries );
  96     if( !st->strings )
  97     {
  98         msi_free( st );
  99         return NULL;
 100     }
 101     st->maxcount = entries;
 102     st->freeslot = 1;
 103     st->codepage = codepage;
 104
 105     for( i=0; i<HASH_SIZE; i++ )
 106         st->hash[i] = -1;
 107
 108     return st;
 109 }
 110
 111 VOID msi_destroy_stringtable( string_table *st )
 112 {
 113     UINT i;
 114
 115     for( i=0; i<st->maxcount; i++ )
 116     {
 117         if( st->strings[i].persistent_refcount ||
 118             st->strings[i].nonpersistent_refcount )
 119             msi_free( st->strings[i].str );
 120     }
 121     msi_free( st->strings );
 122     msi_free( st );
 123 }
 124
 125 static int st_find_free_entry( string_table *st )
 126 {
 127     UINT i, sz;
 128     msistring *p;
 129
 130     TRACE("%p\n", st);
 131
 132     if( st->freeslot )
 133     {
 134         for( i = st->freeslot; i < st->maxcount; i++ )
 135             if( !st->strings[i].persistent_refcount &&
 136                 !st->strings[i].nonpersistent_refcount )
 137                 return i;
 138     }
 139     for( i = 1; i < st->maxcount; i++ )
 140         if( !st->strings[i].persistent_refcount &&
 141             !st->strings[i].nonpersistent_refcount )
 142             return i;
 143
 144     /* dynamically resize */
 145     sz = st->maxcount + 1 + st->maxcount/2;
 146     p = msi_realloc_zero( st->strings, sz*sizeof(msistring) );
 147     if( !p )
 148         return -1;
 149     st->strings = p;
 150     st->freeslot = st->maxcount;
 151     st->maxcount = sz;
 152     if( st->strings[st->freeslot].persistent_refcount ||
 153         st->strings[st->freeslot].nonpersistent_refcount )
 154         ERR("oops. expected freeslot to be free...\n");
 155     return st->freeslot;
 156 }
 157
 158 static void set_st_entry( string_table *st, UINT n, LPWSTR str, UINT refcount, enum StringPersistence persistence )
 159 {
 160     UINT hash = msistring_makehash( str );
 161
 162     if (persistence == StringPersistent)
 163     {
 164         st->strings[n].persistent_refcount = refcount;
 165         st->strings[n].nonpersistent_refcount = 0;
 166     }
 167     else
 168     {
 169         st->strings[n].persistent_refcount = 0;
 170         st->strings[n].nonpersistent_refcount = refcount;
 171     }
 172
 173     st->strings[n].str = str;
 174
 175     st->strings[n].hash_next = st->hash[hash];
 176     st->hash[hash] = n;
 177
 178     if( n < st->maxcount )
 179         st->freeslot = n + 1;
 180 }
 181
 182 static UINT msi_string2idA( const string_table *st, LPCSTR buffer, UINT *id )
 183 {
 184     DWORD sz;
 185     UINT r = ERROR_INVALID_PARAMETER;
 186     LPWSTR str;
 187
 188     TRACE("Finding string %s in string table\n", debugstr_a(buffer) );
 189
 190     if( buffer[0] == 0 )
 191     {
 192         *id = 0;
 193         return ERROR_SUCCESS;
 194     }
 195
 196     sz = MultiByteToWideChar( st->codepage, 0, buffer, -1, NULL, 0 );
 197     if( sz <= 0 )
 198         return r;
 199     str = msi_alloc( sz*sizeof(WCHAR) );
 200     if( !str )
 201         return ERROR_NOT_ENOUGH_MEMORY;
 202     MultiByteToWideChar( st->codepage, 0, buffer, -1, str, sz );
 203
 204     r = msi_string2idW( st, str, id );
 205     msi_free( str );
 206
 207     return r;
 208 }
 209
 210 static int msi_addstring( string_table *st, UINT n, const CHAR *data, int len, UINT refcount, enum StringPersistence persistence )
 211 {
 212     LPWSTR str;
 213     int sz;
 214
 215     if( !data )
 216         return 0;
 217     if( !data[0] )
 218         return 0;
 219     if( n > 0 )
 220     {
 221         if( st->strings[n].persistent_refcount ||
 222             st->strings[n].nonpersistent_refcount )
 223             return -1;
 224     }
 225     else
 226     {
 227         if( ERROR_SUCCESS == msi_string2idA( st, data, &n ) )
 228         {
 229             if (persistence == StringPersistent)
 230                 st->strings[n].persistent_refcount += refcount;
 231             else
 232                 st->strings[n].nonpersistent_refcount += refcount;
 233             return n;
 234         }
 235         n = st_find_free_entry( st );
 236         if( n == -1 )
 237             return -1;
 238     }
 239
 240     if( n < 1 )
 241     {
 242         ERR("invalid index adding %s (%d)\n", debugstr_a( data ), n );
 243         return -1;
 244     }
 245
 246     /* allocate a new string */
 247     if( len < 0 )
 248         len = strlen(data);
 249     sz = MultiByteToWideChar( st->codepage, 0, data, len, NULL, 0 );
 250     str = msi_alloc( (sz+1)*sizeof(WCHAR) );
 251     if( !str )
 252         return -1;
 253     MultiByteToWideChar( st->codepage, 0, data, len, str, sz );
 254     str[sz] = 0;
 255
 256     set_st_entry( st, n, str, refcount, persistence );
 257
 258     return n;
 259 }
 260
 261 int msi_addstringW( string_table *st, UINT n, const WCHAR *data, int len, UINT refcount, enum StringPersistence persistence )
 262 {
 263     LPWSTR str;
 264
 265     /* TRACE("[%2d] = %s\n", string_no, debugstr_an(data,len) ); */
 266
 267     if( !data )
 268         return 0;
 269     if( !data[0] )
 270         return 0;
 271     if( n > 0 )
 272     {
 273         if( st->strings[n].persistent_refcount ||
 274             st->strings[n].nonpersistent_refcount )
 275             return -1;
 276     }
 277     else
 278     {
 279         if( ERROR_SUCCESS == msi_string2idW( st, data, &n ) )
 280         {
 281             if (persistence == StringPersistent)
 282                 st->strings[n].persistent_refcount += refcount;
 283             else
 284                 st->strings[n].nonpersistent_refcount += refcount;
 285             return n;
 286         }
 287         n = st_find_free_entry( st );
 288         if( n == -1 )
 289             return -1;
 290     }
 291
 292     if( n < 1 )
 293     {
 294         ERR("invalid index adding %s (%d)\n", debugstr_w( data ), n );
 295         return -1;
 296     }
 297
 298     /* allocate a new string */
 299     if(len<0)
 300         len = strlenW(data);
 301     TRACE("%s, n = %d len = %d\n", debugstr_w(data), n, len );
 302
 303     str = msi_alloc( (len+1)*sizeof(WCHAR) );
 304     if( !str )
 305         return -1;
 306     memcpy( str, data, len*sizeof(WCHAR) );
 307     str[len] = 0;
 308
 309     set_st_entry( st, n, str, refcount, persistence );
 310
 311     return n;
 312 }
 313
 314 /* find the string identified by an id - return null if there's none */
 315 const WCHAR *msi_string_lookup_id( const string_table *st, UINT id )
 316 {
 317     if( id == 0 )
 318         return szEmpty;
 319
 320     if( id >= st->maxcount )
 321         return NULL;
 322
 323     if( id && !st->strings[id].persistent_refcount && !st->strings[id].nonpersistent_refcount)
 324         return NULL;
 325
 326     return st->strings[id].str;
 327 }
 328
 329 /*
 330  *  msi_id2stringA
 331  *
 332  *  [in] st         - pointer to the string table
 333  *  [in] id         - id of the string to retrieve
 334  *  [out] buffer    - destination of the UTF8 string
 335  *  [in/out] sz     - number of bytes available in the buffer on input
 336  *                    number of bytes used on output
 337  *
 338  *   The size includes the terminating nul character.  Short buffers
 339  *  will be filled, but not nul terminated.
 340  */
 341 static UINT msi_id2stringA( const string_table *st, UINT id, LPSTR buffer, UINT *sz )
 342 {
 343     UINT len;
 344     const WCHAR *str;
 345     int n;
 346
 347     TRACE("Finding string %d of %d\n", id, st->maxcount);
 348
 349     str = msi_string_lookup_id( st, id );
 350     if( !str )
 351         return ERROR_FUNCTION_FAILED;
 352
 353     len = WideCharToMultiByte( st->codepage, 0, str, -1, NULL, 0, NULL, NULL );
 354
 355     if( !buffer )
 356     {
 357         *sz = len;
 358         return ERROR_SUCCESS;
 359     }
 360
 361     if( len > *sz )
 362     {
 363         n = strlenW( str ) + 1;
 364         while( n && (len > *sz) )
 365             len = WideCharToMultiByte( st->codepage, 0,
 366                            str, --n, NULL, 0, NULL, NULL );
 367     }
 368     else
 369         n = -1;
 370
 371     *sz = WideCharToMultiByte( st->codepage, 0, str, n, buffer, len, NULL, NULL );
 372
 373     return ERROR_SUCCESS;
 374 }
 375
 376 /*
 377  *  msi_string2idW
 378  *
 379  *  [in] st         - pointer to the string table
 380  *  [in] str        - string to find in the string table
 381  *  [out] id        - id of the string, if found
 382  */
 383 UINT msi_string2idW( const string_table *st, LPCWSTR str, UINT *id )
 384 {
 385     UINT n, hash = msistring_makehash( str );
 386     msistring *se = st->strings;
 387
 388     for (n = st->hash[hash]; n != -1; n = st->strings[n].hash_next )
 389     {
 390         if ((str == se[n].str) || !lstrcmpW(str, se[n].str))
 391         {
 392             *id = n;
 393             return ERROR_SUCCESS;
 394         }
 395     }
 396
 397     return ERROR_INVALID_PARAMETER;
 398 }
 399
 400 static void string_totalsize( const string_table *st, UINT *datasize, UINT *poolsize )
 401 {
 402     UINT i, len, holesize;
 403
 404     if( st->strings[0].str || st->strings[0].persistent_refcount || st->strings[0].nonpersistent_refcount)
 405         ERR("oops. element 0 has a string\n");
 406
 407     *poolsize = 4;
 408     *datasize = 0;
 409     holesize = 0;
 410     for( i=1; i<st->maxcount; i++ )
 411     {
 412         if( !st->strings[i].persistent_refcount )
 413         {
 414             TRACE("[%u] nonpersistent = %s\n", i, debugstr_w(st->strings[i].str));
 415             (*poolsize) += 4;
 416         }
 417         else if( st->strings[i].str )
 418         {
 419             TRACE("[%u] = %s\n", i, debugstr_w(st->strings[i].str));
 420             len = WideCharToMultiByte( st->codepage, 0,
 421                      st->strings[i].str, -1, NULL, 0, NULL, NULL);
 422             if( len )
 423                 len--;
 424             (*datasize) += len;
 425             if (len>0xffff)
 426                 (*poolsize) += 4;
 427             (*poolsize) += holesize + 4;
 428             holesize = 0;
 429         }
 430         else
 431             holesize += 4;
 432     }
 433     TRACE("data %u pool %u codepage %x\n", *datasize, *poolsize, st->codepage );
 434 }
 435
 436 static const WCHAR szStringData[] = {
 437     '_','S','t','r','i','n','g','D','a','t','a',0 };
 438 static const WCHAR szStringPool[] = {
 439     '_','S','t','r','i','n','g','P','o','o','l',0 };
 440
 441 HRESULT msi_init_string_table( IStorage *stg )
 442 {
 443     USHORT zero[2] = { 0, 0 };
 444     UINT ret;
 445
 446     /* create the StringPool stream... add the zero string to it*/
 447     ret = write_stream_data(stg, szStringPool, zero, sizeof zero, TRUE);
 448     if (ret != ERROR_SUCCESS)
 449         return E_FAIL;
 450
 451     /* create the StringData stream... make it zero length */
 452     ret = write_stream_data(stg, szStringData, NULL, 0, TRUE);
 453     if (ret != ERROR_SUCCESS)
 454         return E_FAIL;
 455
 456     return S_OK;
 457 }
 458
 459 string_table *msi_load_string_table( IStorage *stg, UINT *bytes_per_strref )
 460 {
 461     string_table *st = NULL;
 462     CHAR *data = NULL;
 463     USHORT *pool = NULL;
 464     UINT r, datasize = 0, poolsize = 0, codepage;
 465     DWORD i, count, offset, len, n, refs;
 466
 467     r = read_stream_data( stg, szStringPool, TRUE, (BYTE **)&pool, &poolsize );
 468     if( r != ERROR_SUCCESS)
 469         goto end;
 470     r = read_stream_data( stg, szStringData, TRUE, (BYTE **)&data, &datasize );
 471     if( r != ERROR_SUCCESS)
 472         goto end;
 473
 474     if ( (poolsize > 4) && (pool[1] & 0x8000) )
 475         *bytes_per_strref = LONG_STR_BYTES;
 476     else
 477         *bytes_per_strref = sizeof(USHORT);
 478
 479     count = poolsize/4;
 480     if( poolsize > 4 )
 481         codepage = pool[0] | ( (pool[1] & ~0x8000) << 16 );
 482     else
 483         codepage = CP_ACP;
 484     st = init_stringtable( count, codepage );
 485     if (!st)
 486         goto end;
 487
 488     offset = 0;
 489     n = 1;
 490     i = 1;
 491     while( i<count )
 492     {
 493         /* the string reference count is always the second word */
 494         refs = pool[i*2+1];
 495
 496         /* empty entries have two zeros, still have a string id */
 497         if (pool[i*2] == 0 && refs == 0)
 498         {
 499             i++;
 500             n++;
 501             continue;
 502         }
 503
 504         /*
 505          * If a string is over 64k, the previous string entry is made null
 506          * and its the high word of the length is inserted in the null string's
 507          * reference count field.
 508          */
 509         if( pool[i*2] == 0)
 510         {
 511             len = (pool[i*2+3] << 16) + pool[i*2+2];
 512             i += 2;
 513         }
 514         else
 515         {
 516             len = pool[i*2];
 517             i += 1;
 518         }
 519
 520         if ( (offset + len) > datasize )
 521         {
 522             ERR("string table corrupt?\n");
 523             break;
 524         }
 525
 526         r = msi_addstring( st, n, data+offset, len, refs, StringPersistent );
 527         if( r != n )
 528             ERR("Failed to add string %d\n", n );
 529         n++;
 530         offset += len;
 531     }
 532
 533     if ( datasize != offset )
 534         ERR("string table load failed! (%08x != %08x), please report\n", datasize, offset );
 535
 536     TRACE("Loaded %d strings\n", count);
 537
 538 end:
 539     msi_free( pool );
 540     msi_free( data );
 541
 542     return st;
 543 }
 544
 545 UINT msi_save_string_table( const string_table *st, IStorage *storage )
 546 {
 547     UINT i, datasize = 0, poolsize = 0, sz, used, r, codepage, n;
 548     UINT ret = ERROR_FUNCTION_FAILED;
 549     CHAR *data = NULL;
 550     USHORT *pool = NULL;
 551
 552     TRACE("\n");
 553
 554     /* construct the new table in memory first */
 555     string_totalsize( st, &datasize, &poolsize );
 556
 557     TRACE("%u %u %u\n", st->maxcount, datasize, poolsize );
 558
 559     pool = msi_alloc( poolsize );
 560     if( ! pool )
 561     {
 562         WARN("Failed to alloc pool %d bytes\n", poolsize );
 563         goto err;
 564     }
 565     data = msi_alloc( datasize );
 566     if( ! data )
 567     {
 568         WARN("Failed to alloc data %d bytes\n", poolsize );
 569         goto err;
 570     }
 571
 572     used = 0;
 573     codepage = st->codepage;
 574     pool[0]=codepage&0xffff;
 575     pool[1]=(codepage>>16);
 576     n = 1;
 577     for( i=1; i<st->maxcount; i++ )
 578     {
 579         if( !st->strings[i].persistent_refcount )
 580         {
 581             pool[ n*2 ] = 0;
 582             pool[ n*2 + 1] = 0;
 583             n++;
 584             continue;
 585         }
 586
 587         sz = datasize - used;
 588         r = msi_id2stringA( st, i, data+used, &sz );
 589         if( r != ERROR_SUCCESS )
 590         {
 591             ERR("failed to fetch string\n");
 592             sz = 0;
 593         }
 594         if( sz && (sz < (datasize - used ) ) )
 595             sz--;
 596
 597         if (sz)
 598             pool[ n*2 + 1 ] = st->strings[i].persistent_refcount;
 599         else
 600             pool[ n*2 + 1 ] = 0;
 601         if (sz < 0x10000)
 602         {
 603             pool[ n*2 ] = sz;
 604             n++;
 605         }
 606         else
 607         {
 608             pool[ n*2 ] = 0;
 609             pool[ n*2 + 2 ] = sz&0xffff;
 610             pool[ n*2 + 3 ] = (sz>>16);
 611             n += 2;
 612         }
 613         used += sz;
 614         if( used > datasize  )
 615         {
 616             ERR("oops overran %d >= %d\n", used, datasize);
 617             goto err;
 618         }
 619     }
 620
 621     if( used != datasize )
 622     {
 623         ERR("oops used %d != datasize %d\n", used, datasize);
 624         goto err;
 625     }
 626
 627     /* write the streams */
 628     r = write_stream_data( storage, szStringData, data, datasize, TRUE );
 629     TRACE("Wrote StringData r=%08x\n", r);
 630     if( r )
 631         goto err;
 632     r = write_stream_data( storage, szStringPool, pool, poolsize, TRUE );
 633     TRACE("Wrote StringPool r=%08x\n", r);
 634     if( r )
 635         goto err;
 636
 637     ret = ERROR_SUCCESS;
 638
 639 err:
 640     msi_free( data );
 641     msi_free( pool );
 642
 643     return ret;
 644 }