dlls/msi/string.c

   1 /*
   2  * Implementation of the Microsoft Installer (msi.dll)
   3  *
   4  * Copyright 2002-2004, 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 #include <assert.h>
  23
  24 #include "windef.h"
  25 #include "winbase.h"
  26 #include "winerror.h"
  27 #include "wine/debug.h"
  28 #include "wine/unicode.h"
  29 #include "msi.h"
  30 #include "msiquery.h"
  31 #include "objbase.h"
  32 #include "objidl.h"
  33 #include "msipriv.h"
  34 #include "winnls.h"
  35
  36 #include "query.h"
  37
  38 WINE_DEFAULT_DEBUG_CHANNEL(msidb);
  39
  40 #define HASH_SIZE 67
  41
  42 typedef struct _msistring
  43 {
  44     int hash_next;
  45     UINT refcount;
  46     LPWSTR str;
  47 } msistring;
  48
  49 struct string_table
  50 {
  51     UINT maxcount;         /* the number of strings */
  52     UINT freeslot;
  53     UINT codepage;
  54     int hash[HASH_SIZE];
  55     msistring *strings; /* an array of strings (in the tree) */
  56 };
  57
  58 static UINT msistring_makehash( const WCHAR *str )
  59 {
  60     UINT hash = 0;
  61
  62     if (str==NULL)
  63         return hash;
  64
  65     while( *str )
  66     {
  67         hash ^= *str++;
  68         hash *= 53;
  69         hash = (hash<<5) | (hash>>27);
  70     }
  71     return hash % HASH_SIZE;
  72 }
  73
  74 string_table *msi_init_stringtable( int entries, UINT codepage )
  75 {
  76     string_table *st;
  77     int i;
  78
  79     st = msi_alloc( sizeof (string_table) );
  80     if( !st )
  81         return NULL;
  82     if( entries < 1 )
  83         entries = 1;
  84     st->strings = msi_alloc_zero( sizeof (msistring) * entries );
  85     if( !st->strings )
  86     {
  87         msi_free( st );
  88         return NULL;
  89     }
  90     st->maxcount = entries;
  91     st->freeslot = 1;
  92     st->codepage = codepage;
  93
  94     for( i=0; i<HASH_SIZE; i++ )
  95         st->hash[i] = -1;
  96
  97     return st;
  98 }
  99
 100 VOID msi_destroy_stringtable( string_table *st )
 101 {
 102     UINT i;
 103
 104     for( i=0; i<st->maxcount; i++ )
 105     {
 106         if( st->strings[i].refcount )
 107             msi_free( st->strings[i].str );
 108     }
 109     msi_free( st->strings );
 110     msi_free( st );
 111 }
 112
 113 static int st_find_free_entry( string_table *st )
 114 {
 115     UINT i, sz;
 116     msistring *p;
 117
 118     TRACE("%p\n", st);
 119
 120     if( st->freeslot )
 121     {
 122         for( i = st->freeslot; i < st->maxcount; i++ )
 123             if( !st->strings[i].refcount )
 124                 return i;
 125     }
 126     for( i = 1; i < st->maxcount; i++ )
 127         if( !st->strings[i].refcount )
 128             return i;
 129
 130     /* dynamically resize */
 131     sz = st->maxcount + 1 + st->maxcount/2;
 132     p = msi_realloc_zero( st->strings, sz*sizeof(msistring) );
 133     if( !p )
 134         return -1;
 135     st->strings = p;
 136     st->freeslot = st->maxcount;
 137     st->maxcount = sz;
 138     if( st->strings[st->freeslot].refcount )
 139         ERR("oops. expected freeslot to be free...\n");
 140     return st->freeslot;
 141 }
 142
 143 static void set_st_entry( string_table *st, UINT n, LPWSTR str )
 144 {
 145     UINT hash = msistring_makehash( str );
 146
 147     st->strings[n].refcount = 1;
 148     st->strings[n].str = str;
 149
 150     st->strings[n].hash_next = st->hash[hash];
 151     st->hash[hash] = n;
 152
 153     if( n < st->maxcount )
 154         st->freeslot = n + 1;
 155 }
 156
 157 int msi_addstring( string_table *st, UINT n, const CHAR *data, int len, UINT refcount )
 158 {
 159     LPWSTR str;
 160     int sz;
 161
 162     if( !data )
 163         return 0;
 164     if( !data[0] )
 165         return 0;
 166     if( n > 0 )
 167     {
 168         if( st->strings[n].refcount )
 169             return -1;
 170     }
 171     else
 172     {
 173         if( ERROR_SUCCESS == msi_string2idA( st, data, &n ) )
 174         {
 175             st->strings[n].refcount++;
 176             return n;
 177         }
 178         n = st_find_free_entry( st );
 179         if( n < 0 )
 180             return -1;
 181     }
 182
 183     if( n < 1 )
 184     {
 185         ERR("invalid index adding %s (%d)\n", debugstr_a( data ), n );
 186         return -1;
 187     }
 188
 189     /* allocate a new string */
 190     if( len < 0 )
 191         len = strlen(data);
 192     sz = MultiByteToWideChar( st->codepage, 0, data, len, NULL, 0 );
 193     str = msi_alloc( (sz+1)*sizeof(WCHAR) );
 194     if( !str )
 195         return -1;
 196     MultiByteToWideChar( st->codepage, 0, data, len, str, sz );
 197     str[sz] = 0;
 198
 199     set_st_entry( st, n, str );
 200
 201     return n;
 202 }
 203
 204 int msi_addstringW( string_table *st, UINT n, const WCHAR *data, int len, UINT refcount )
 205 {
 206     LPWSTR str;
 207
 208     /* TRACE("[%2d] = %s\n", string_no, debugstr_an(data,len) ); */
 209
 210     if( !data )
 211         return 0;
 212     if( !data[0] )
 213         return 0;
 214     if( n > 0 )
 215     {
 216         if( st->strings[n].refcount )
 217             return -1;
 218     }
 219     else
 220     {
 221         if( ERROR_SUCCESS == msi_string2idW( st, data, &n ) )
 222         {
 223             st->strings[n].refcount++;
 224             return n;
 225         }
 226         n = st_find_free_entry( st );
 227         if( n < 0 )
 228             return -1;
 229     }
 230
 231     if( n < 1 )
 232     {
 233         ERR("invalid index adding %s (%d)\n", debugstr_w( data ), n );
 234         return -1;
 235     }
 236
 237     /* allocate a new string */
 238     if(len<0)
 239         len = strlenW(data);
 240     TRACE("%s, n = %d len = %d\n", debugstr_w(data), n, len );
 241
 242     str = msi_alloc( (len+1)*sizeof(WCHAR) );
 243     if( !str )
 244         return -1;
 245     TRACE("%d\n",__LINE__);
 246     memcpy( str, data, len*sizeof(WCHAR) );
 247     str[len] = 0;
 248
 249     set_st_entry( st, n, str );
 250
 251     return n;
 252 }
 253
 254 /* find the string identified by an id - return null if there's none */
 255 const WCHAR *msi_string_lookup_id( string_table *st, UINT id )
 256 {
 257     static const WCHAR zero[] = { 0 };
 258     if( id == 0 )
 259         return zero;
 260
 261     if( id >= st->maxcount )
 262         return NULL;
 263
 264     if( id && !st->strings[id].refcount )
 265         return NULL;
 266
 267     return st->strings[id].str;
 268 }
 269
 270 /*
 271  *  msi_id2stringW
 272  *
 273  *  [in] st         - pointer to the string table
 274  *  [in] id  - id of the string to retrieve
 275  *  [out] buffer    - destination of the string
 276  *  [in/out] sz     - number of bytes available in the buffer on input
 277  *                    number of bytes used on output
 278  *
 279  *   The size includes the terminating nul character.  Short buffers
 280  *  will be filled, but not nul terminated.
 281  */
 282 UINT msi_id2stringW( string_table *st, UINT id, LPWSTR buffer, UINT *sz )
 283 {
 284     UINT len;
 285     const WCHAR *str;
 286
 287     TRACE("Finding string %d of %d\n", id, st->maxcount);
 288
 289     str = msi_string_lookup_id( st, id );
 290     if( !str )
 291         return ERROR_FUNCTION_FAILED;
 292
 293     len = strlenW( str ) + 1;
 294
 295     if( !buffer )
 296     {
 297         *sz = len;
 298         return ERROR_SUCCESS;
 299     }
 300
 301     if( *sz < len )
 302         *sz = len;
 303     memcpy( buffer, str, (*sz)*sizeof(WCHAR) );
 304     *sz = len;
 305
 306     return ERROR_SUCCESS;
 307 }
 308
 309 /*
 310  *  msi_id2stringA
 311  *
 312  *  [in] st         - pointer to the string table
 313  *  [in] id         - id of the string to retrieve
 314  *  [out] buffer    - destination of the UTF8 string
 315  *  [in/out] sz     - number of bytes available in the buffer on input
 316  *                    number of bytes used on output
 317  *
 318  *   The size includes the terminating nul character.  Short buffers
 319  *  will be filled, but not nul terminated.
 320  */
 321 UINT msi_id2stringA( string_table *st, UINT id, LPSTR buffer, UINT *sz )
 322 {
 323     UINT len;
 324     const WCHAR *str;
 325     int n;
 326
 327     TRACE("Finding string %d of %d\n", id, st->maxcount);
 328
 329     str = msi_string_lookup_id( st, id );
 330     if( !str )
 331         return ERROR_FUNCTION_FAILED;
 332
 333     len = WideCharToMultiByte( st->codepage, 0, str, -1, NULL, 0, NULL, NULL );
 334
 335     if( !buffer )
 336     {
 337         *sz = len;
 338         return ERROR_SUCCESS;
 339     }
 340
 341     if( len > *sz )
 342     {
 343         n = strlenW( str ) + 1;
 344         while( n && (len > *sz) )
 345             len = WideCharToMultiByte( st->codepage, 0,
 346                            str, --n, NULL, 0, NULL, NULL );
 347     }
 348     else
 349         n = -1;
 350
 351     *sz = WideCharToMultiByte( st->codepage, 0, str, n, buffer, len, NULL, NULL );
 352
 353     return ERROR_SUCCESS;
 354 }
 355
 356 /*
 357  *  msi_string2idW
 358  *
 359  *  [in] st         - pointer to the string table
 360  *  [in] str        - string to find in the string table
 361  *  [out] id        - id of the string, if found
 362  */
 363 UINT msi_string2idW( string_table *st, LPCWSTR str, UINT *id )
 364 {
 365     UINT n, hash = msistring_makehash( str );
 366     msistring *se = st->strings;
 367
 368     for (n = st->hash[hash]; n != -1; n = st->strings[n].hash_next )
 369     {
 370         if ((str == se[n].str) || !lstrcmpW(str, se[n].str))
 371         {
 372             *id = n;
 373             return ERROR_SUCCESS;
 374         }
 375     }
 376
 377     return ERROR_INVALID_PARAMETER;
 378 }
 379
 380 UINT msi_string2idA( string_table *st, LPCSTR buffer, UINT *id )
 381 {
 382     DWORD sz;
 383     UINT r = ERROR_INVALID_PARAMETER;
 384     LPWSTR str;
 385
 386     TRACE("Finding string %s in string table\n", debugstr_a(buffer) );
 387
 388     if( buffer[0] == 0 )
 389     {
 390         *id = 0;
 391         return ERROR_SUCCESS;
 392     }
 393
 394     sz = MultiByteToWideChar( st->codepage, 0, buffer, -1, NULL, 0 );
 395     if( sz <= 0 )
 396         return r;
 397     str = msi_alloc( sz*sizeof(WCHAR) );
 398     if( !str )
 399         return ERROR_NOT_ENOUGH_MEMORY;
 400     MultiByteToWideChar( st->codepage, 0, buffer, -1, str, sz );
 401
 402     r = msi_string2idW( st, str, id );
 403     msi_free( str );
 404
 405     return r;
 406 }
 407
 408 UINT msi_strcmp( string_table *st, UINT lval, UINT rval, UINT *res )
 409 {
 410     const WCHAR *l_str, *r_str;
 411
 412     l_str = msi_string_lookup_id( st, lval );
 413     if( !l_str )
 414         return ERROR_INVALID_PARAMETER;
 415
 416     r_str = msi_string_lookup_id( st, rval );
 417     if( !r_str )
 418         return ERROR_INVALID_PARAMETER;
 419
 420     /* does this do the right thing for all UTF-8 strings? */
 421     *res = strcmpW( l_str, r_str );
 422
 423     return ERROR_SUCCESS;
 424 }
 425
 426 UINT msi_string_count( string_table *st )
 427 {
 428     return st->maxcount;
 429 }
 430
 431 UINT msi_id_refcount( string_table *st, UINT i )
 432 {
 433     if( i >= st->maxcount )
 434         return 0;
 435     return st->strings[i].refcount;
 436 }
 437
 438 UINT msi_string_totalsize( string_table *st, UINT *total )
 439 {
 440     UINT size = 0, i, len;
 441
 442     if( st->strings[0].str || st->strings[0].refcount )
 443         ERR("oops. element 0 has a string\n");
 444     *total = 0;
 445     for( i=1; i<st->maxcount; i++ )
 446     {
 447         if( st->strings[i].str )
 448         {
 449             TRACE("[%u] = %s\n", i, debugstr_w(st->strings[i].str));
 450             len = WideCharToMultiByte( st->codepage, 0,
 451                      st->strings[i].str, -1, NULL, 0, NULL, NULL);
 452             if( len )
 453                 len--;
 454             size += len;
 455             *total = (i+1);
 456         }
 457     }
 458     TRACE("%u/%u strings %u bytes codepage %x\n", *total, st->maxcount, size, st->codepage );
 459     return size;
 460 }
 461
 462 UINT msi_string_get_codepage( string_table *st )
 463 {
 464     return st->codepage;
 465 }