summaryrefslogtreecommitdiff
path: root/apt-pkg/pkgcache.cc
blob: 385d247ea13bfbd3603d2b2f4b4dcd56497219de (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: pkgcache.cc,v 1.37 2003/02/10 01:40:58 doogie Exp $
/* ######################################################################
   
   Package Cache - Accessor code for the cache
   
   Please see doc/apt-pkg/cache.sgml for a more detailed description of 
   this format. Also be sure to keep that file up-to-date!!
   
   This is the general utility functions for cache managment. They provide
   a complete set of accessor functions for the cache. The cacheiterators
   header contains the STL-like iterators that can be used to easially
   navigate the cache as well as seemlessly dereference the mmap'd 
   indexes. Use these always.
   
   The main class provides for ways to get package indexes and some
   general lookup functions to start the iterators.

   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/indexfile.h>
#include <apt-pkg/version.h>
#include <apt-pkg/error.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/configuration.h>

#include <apti18n.h>
    
#include <string>
#include <sys/stat.h>
#include <unistd.h>

#include <ctype.h>
#include <system.h>
									/*}}}*/

using std::string;


// Cache::Header::Header - Constructor					/*{{{*/
// ---------------------------------------------------------------------
/* Simply initialize the header */
pkgCache::Header::Header()
{
   Signature = 0x98FE76DC;
   
   /* Whenever the structures change the major version should be bumped,
      whenever the generator changes the minor version should be bumped. */
   MajorVersion = 7;
   MinorVersion = 0;
   Dirty = false;
   
   HeaderSz = sizeof(pkgCache::Header);
   PackageSz = sizeof(pkgCache::Package);
   PackageFileSz = sizeof(pkgCache::PackageFile);
   VersionSz = sizeof(pkgCache::Version);
   DescriptionSz = sizeof(pkgCache::Description);
   DependencySz = sizeof(pkgCache::Dependency);
   ProvidesSz = sizeof(pkgCache::Provides);
   VerFileSz = sizeof(pkgCache::VerFile);
   DescFileSz = sizeof(pkgCache::DescFile);
   
   PackageCount = 0;
   VersionCount = 0;
   DescriptionCount = 0;
   DependsCount = 0;
   PackageFileCount = 0;
   VerFileCount = 0;
   DescFileCount = 0;
   ProvidesCount = 0;
   MaxVerFileSize = 0;
   MaxDescFileSize = 0;
   
   FileList = 0;
   StringList = 0;
   VerSysName = 0;
   Architecture = 0;
   memset(HashTable,0,sizeof(HashTable));
   memset(Pools,0,sizeof(Pools));
}
									/*}}}*/
// Cache::Header::CheckSizes - Check if the two headers have same *sz	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgCache::Header::CheckSizes(Header &Against) const
{
   if (HeaderSz == Against.HeaderSz &&
       PackageSz == Against.PackageSz &&
       PackageFileSz == Against.PackageFileSz &&
       VersionSz == Against.VersionSz &&
       DescriptionSz == Against.DescriptionSz &&
       DependencySz == Against.DependencySz &&
       VerFileSz == Against.VerFileSz &&
       DescFileSz == Against.DescFileSz &&
       ProvidesSz == Against.ProvidesSz)
      return true;
   return false;
}
									/*}}}*/

// Cache::pkgCache - Constructor					/*{{{*/
// ---------------------------------------------------------------------
/* */
pkgCache::pkgCache(MMap *Map, bool DoMap) : Map(*Map)
{
   if (DoMap == true)
      ReMap();
}
									/*}}}*/
// Cache::ReMap - Reopen the cache file					/*{{{*/
// ---------------------------------------------------------------------
/* If the file is already closed then this will open it open it. */
bool pkgCache::ReMap()
{
   // Apply the typecasts.
   HeaderP = (Header *)Map.Data();
   PkgP = (Package *)Map.Data();
   VerFileP = (VerFile *)Map.Data();
   DescFileP = (DescFile *)Map.Data();
   PkgFileP = (PackageFile *)Map.Data();
   VerP = (Version *)Map.Data();
   DescP = (Description *)Map.Data();
   ProvideP = (Provides *)Map.Data();
   DepP = (Dependency *)Map.Data();
   StringItemP = (StringItem *)Map.Data();
   StrP = (char *)Map.Data();

   if (Map.Size() == 0 || HeaderP == 0)
      return _error->Error(_("Empty package cache"));
   
   // Check the header
   Header DefHeader;
   if (HeaderP->Signature != DefHeader.Signature ||
       HeaderP->Dirty == true)
      return _error->Error(_("The package cache file is corrupted"));
   
   if (HeaderP->MajorVersion != DefHeader.MajorVersion ||
       HeaderP->MinorVersion != DefHeader.MinorVersion ||
       HeaderP->CheckSizes(DefHeader) == false)
      return _error->Error(_("The package cache file is an incompatible version"));

   // Locate our VS..
   if (HeaderP->VerSysName == 0 ||
       (VS = pkgVersioningSystem::GetVS(StrP + HeaderP->VerSysName)) == 0)
      return _error->Error(_("This APT does not support the versioning system '%s'"),StrP + HeaderP->VerSysName);

   // Chcek the arhcitecture
   if (HeaderP->Architecture == 0 ||
       _config->Find("APT::Architecture") != StrP + HeaderP->Architecture)
      return _error->Error(_("The package cache was built for a different architecture"));
   return true;
}
									/*}}}*/
// Cache::Hash - Hash a string						/*{{{*/
// ---------------------------------------------------------------------
/* This is used to generate the hash entries for the HashTable. With my
   package list from bo this function gets 94% table usage on a 512 item
   table (480 used items) */
unsigned long pkgCache::sHash(const string &Str) const
{
   unsigned long Hash = 0;
   for (string::const_iterator I = Str.begin(); I != Str.end(); I++)
      Hash = 5*Hash + tolower(*I);
   return Hash % _count(HeaderP->HashTable);
}

unsigned long pkgCache::sHash(const char *Str) const
{
   unsigned long Hash = 0;
   for (const char *I = Str; *I != 0; I++)
      Hash = 5*Hash + tolower(*I);
   return Hash % _count(HeaderP->HashTable);
}

									/*}}}*/
// Cache::FindPkg - Locate a package by name				/*{{{*/
// ---------------------------------------------------------------------
/* Returns 0 on error, pointer to the package otherwise */
pkgCache::PkgIterator pkgCache::FindPkg(const string &Name)
{
   // Look at the hash bucket
   Package *Pkg = PkgP + HeaderP->HashTable[Hash(Name)];
   for (; Pkg != PkgP; Pkg = PkgP + Pkg->NextPackage)
   {
      if (Pkg->Name != 0 && StrP[Pkg->Name] == Name[0] &&
	  stringcasecmp(Name,StrP + Pkg->Name) == 0)
	 return PkgIterator(*this,Pkg);
   }
   return PkgIterator(*this,0);
}
									/*}}}*/
// Cache::CompTypeDeb - Return a string describing the compare type	/*{{{*/
// ---------------------------------------------------------------------
/* This returns a string representation of the dependency compare 
   type in the weird debian style.. */
const char *pkgCache::CompTypeDeb(unsigned char Comp)
{
   const char *Ops[] = {"","<=",">=","<<",">>","=","!="};
   if ((unsigned)(Comp & 0xF) < 7)
      return Ops[Comp & 0xF];
   return "";	 
}
									/*}}}*/
// Cache::CompType - Return a string describing the compare type	/*{{{*/
// ---------------------------------------------------------------------
/* This returns a string representation of the dependency compare 
   type */
const char *pkgCache::CompType(unsigned char Comp)
{
   const char *Ops[] = {"","<=",">=","<",">","=","!="};
   if ((unsigned)(Comp & 0xF) < 7)
      return Ops[Comp & 0xF];
   return "";	 
}
									/*}}}*/
// Cache::DepType - Return a string describing the dep type		/*{{{*/
// ---------------------------------------------------------------------
/* */
const char *pkgCache::DepType(unsigned char Type)
{
   const char *Types[] = {"",_("Depends"),_("PreDepends"),_("Suggests"),
                          _("Recommends"),_("Conflicts"),_("Replaces"),
                          _("Obsoletes"),_("Breaks")};
   if (Type < sizeof(Types)/sizeof(*Types))
      return Types[Type];
   return "";
}
									/*}}}*/
// Cache::Priority - Convert a priority value to a string		/*{{{*/
// ---------------------------------------------------------------------
/* */
const char *pkgCache::Priority(unsigned char Prio)
{
   const char *Mapping[] = {0,_("important"),_("required"),_("standard"),
                            _("optional"),_("extra")};
   if (Prio < _count(Mapping))
      return Mapping[Prio];
   return 0;
}
									/*}}}*/
// Bases for iterator classes						/*{{{*/
void pkgCache::VerIterator::_dummy() {}
void pkgCache::DepIterator::_dummy() {}
void pkgCache::PrvIterator::_dummy() {}
void pkgCache::DescIterator::_dummy() {}
									/*}}}*/
// PkgIterator::operator ++ - Postfix incr				/*{{{*/
// ---------------------------------------------------------------------
/* This will advance to the next logical package in the hash table. */
void pkgCache::PkgIterator::operator ++(int) 
{
   // Follow the current links
   if (Pkg != Owner->PkgP)
      Pkg = Owner->PkgP + Pkg->NextPackage;

   // Follow the hash table
   while (Pkg == Owner->PkgP && (HashIndex+1) < (signed)_count(Owner->HeaderP->HashTable))
   {
      HashIndex++;
      Pkg = Owner->PkgP + Owner->HeaderP->HashTable[HashIndex];
   }
};
									/*}}}*/
// PkgIterator::State - Check the State of the package			/*{{{*/
// ---------------------------------------------------------------------
/* By this we mean if it is either cleanly installed or cleanly removed. */
pkgCache::PkgIterator::OkState pkgCache::PkgIterator::State() const
{  
   if (Pkg->InstState == pkgCache::State::ReInstReq ||
       Pkg->InstState == pkgCache::State::HoldReInstReq)
      return NeedsUnpack;
   
   if (Pkg->CurrentState == pkgCache::State::UnPacked ||
       Pkg->CurrentState == pkgCache::State::HalfConfigured) ||
      //we don't need to care for triggers awaiting packages
      //dpkg will deal with them automatically when the 
      //trigger pending action is run (those packages are usually
      //in half-configured or triggers-pending state)
      //Pkg->CurrentState == pkgCache::State::TriggersAwaited
       Pkg->CurrentState == pkgCache::State::TriggersPending)
      return NeedsConfigure;
   
   if (Pkg->CurrentState == pkgCache::State::HalfInstalled ||
       Pkg->InstState != pkgCache::State::Ok)
      return NeedsUnpack;
      
   return NeedsNothing;
}
									/*}}}*/
// DepIterator::IsCritical - Returns true if the dep is important	/*{{{*/
// ---------------------------------------------------------------------
/* Currently critical deps are defined as depends, predepends and
   conflicts (including dpkg's Breaks fields). */
bool pkgCache::DepIterator::IsCritical()
{
   if (Dep->Type == pkgCache::Dep::Conflicts ||
       Dep->Type == pkgCache::Dep::DpkgBreaks ||
       Dep->Type == pkgCache::Dep::Obsoletes ||
       Dep->Type == pkgCache::Dep::Depends ||
       Dep->Type == pkgCache::Dep::PreDepends)
      return true;
   return false;
}
									/*}}}*/
// DepIterator::SmartTargetPkg - Resolve dep target pointers w/provides	/*{{{*/
// ---------------------------------------------------------------------
/* This intellegently looks at dep target packages and tries to figure
   out which package should be used. This is needed to nicely handle
   provide mapping. If the target package has no other providing packages
   then it returned. Otherwise the providing list is looked at to 
   see if there is one one unique providing package if so it is returned.
   Otherwise true is returned and the target package is set. The return
   result indicates whether the node should be expandable 
 
   In Conjunction with the DepCache the value of Result may not be 
   super-good since the policy may have made it uninstallable. Using
   AllTargets is better in this case. */
bool pkgCache::DepIterator::SmartTargetPkg(PkgIterator &Result)
{
   Result = TargetPkg();
   
   // No provides at all
   if (Result->ProvidesList == 0)
      return false;
   
   // There is the Base package and the providing ones which is at least 2
   if (Result->VersionList != 0)
      return true;
      
   /* We have to skip over indirect provisions of the package that
      owns the dependency. For instance, if libc5-dev depends on the
      virtual package libc-dev which is provided by libc5-dev and libc6-dev
      we must ignore libc5-dev when considering the provides list. */ 
   PrvIterator PStart = Result.ProvidesList();
   for (; PStart.end() != true && PStart.OwnerPkg() == ParentPkg(); PStart++);

   // Nothing but indirect self provides
   if (PStart.end() == true)
      return false;
   
   // Check for single packages in the provides list
   PrvIterator P = PStart;
   for (; P.end() != true; P++)
   {
      // Skip over self provides
      if (P.OwnerPkg() == ParentPkg())
	 continue;
      if (PStart.OwnerPkg() != P.OwnerPkg())
	 break;
   }

   Result = PStart.OwnerPkg();
   
   // Check for non dups
   if (P.end() != true)
      return true;
   
   return false;
}
									/*}}}*/
// DepIterator::AllTargets - Returns the set of all possible targets	/*{{{*/
// ---------------------------------------------------------------------
/* This is a more useful version of TargetPkg() that follows versioned
   provides. It includes every possible package-version that could satisfy
   the dependency. The last item in the list has a 0. The resulting pointer
   must be delete [] 'd */
pkgCache::Version **pkgCache::DepIterator::AllTargets()
{
   Version **Res = 0;
   unsigned long Size =0;
   while (1)
   {
      Version **End = Res;
      PkgIterator DPkg = TargetPkg();

      // Walk along the actual package providing versions
      for (VerIterator I = DPkg.VersionList(); I.end() == false; I++)
      {
	 if (Owner->VS->CheckDep(I.VerStr(),Dep->CompareOp,TargetVer()) == false)
	    continue;

	 if ((Dep->Type == pkgCache::Dep::Conflicts ||
	      Dep->Type == pkgCache::Dep::DpkgBreaks ||
	      Dep->Type == pkgCache::Dep::Obsoletes) &&
	     ParentPkg() == I.ParentPkg())
	    continue;
	 
	 Size++;
	 if (Res != 0)
	    *End++ = I;
      }
      
      // Follow all provides
      for (PrvIterator I = DPkg.ProvidesList(); I.end() == false; I++)
      {
	 if (Owner->VS->CheckDep(I.ProvideVersion(),Dep->CompareOp,TargetVer()) == false)
	    continue;
	 
	 if ((Dep->Type == pkgCache::Dep::Conflicts ||
	      Dep->Type == pkgCache::Dep::DpkgBreaks ||
	      Dep->Type == pkgCache::Dep::Obsoletes) &&
	     ParentPkg() == I.OwnerPkg())
	    continue;
	 
	 Size++;
	 if (Res != 0)
	    *End++ = I.OwnerVer();
      }
      
      // Do it again and write it into the array
      if (Res == 0)
      {
	 Res = new Version *[Size+1];
	 Size = 0;
      }
      else
      {
	 *End = 0;
	 break;
      }      
   }
   
   return Res;
}
									/*}}}*/
// DepIterator::GlobOr - Compute an OR group				/*{{{*/
// ---------------------------------------------------------------------
/* This Takes an iterator, iterates past the current dependency grouping
   and returns Start and End so that so End is the final element
   in the group, if End == Start then D is End++ and End is the
   dependency D was pointing to. Use in loops to iterate sensibly. */
void pkgCache::DepIterator::GlobOr(DepIterator &Start,DepIterator &End)
{
   // Compute a single dependency element (glob or)
   Start = *this;
   End = *this;
   for (bool LastOR = true; end() == false && LastOR == true;)
   {
      LastOR = (Dep->CompareOp & pkgCache::Dep::Or) == pkgCache::Dep::Or;
      (*this)++;
      if (LastOR == true)
	 End = (*this);
   }
}
									/*}}}*/
// VerIterator::CompareVer - Fast version compare for same pkgs		/*{{{*/
// ---------------------------------------------------------------------
/* This just looks over the version list to see if B is listed before A. In
   most cases this will return in under 4 checks, ver lists are short. */
int pkgCache::VerIterator::CompareVer(const VerIterator &B) const
{
   // Check if they are equal
   if (*this == B)
      return 0;
   if (end() == true)
      return -1;
   if (B.end() == true)
      return 1;
       
   /* Start at A and look for B. If B is found then A > B otherwise
      B was before A so A < B */
   VerIterator I = *this;
   for (;I.end() == false; I++)
      if (I == B)
	 return 1;
   return -1;
}
									/*}}}*/
// VerIterator::Downloadable - Checks if the version is downloadable	/*{{{*/
// ---------------------------------------------------------------------
/* */
bool pkgCache::VerIterator::Downloadable() const
{
   VerFileIterator Files = FileList();
   for (; Files.end() == false; Files++)
      if ((Files.File()->Flags & pkgCache::Flag::NotSource) != pkgCache::Flag::NotSource)
	 return true;
   return false;
}
									/*}}}*/
// VerIterator::Automatic - Check if this version is 'automatic'	/*{{{*/
// ---------------------------------------------------------------------
/* This checks to see if any of the versions files are not NotAutomatic. 
   True if this version is selectable for automatic installation. */
bool pkgCache::VerIterator::Automatic() const
{
   VerFileIterator Files = FileList();
   for (; Files.end() == false; Files++)
      if ((Files.File()->Flags & pkgCache::Flag::NotAutomatic) != pkgCache::Flag::NotAutomatic)
	 return true;
   return false;
}
									/*}}}*/
// VerIterator::NewestFile - Return the newest file version relation	/*{{{*/
// ---------------------------------------------------------------------
/* This looks at the version numbers associated with all of the sources
   this version is in and returns the highest.*/
pkgCache::VerFileIterator pkgCache::VerIterator::NewestFile() const
{
   VerFileIterator Files = FileList();
   VerFileIterator Highest = Files;
   for (; Files.end() == false; Files++)
   {
      if (Owner->VS->CmpReleaseVer(Files.File().Version(),Highest.File().Version()) > 0)
	 Highest = Files;
   }
   
   return Highest;
}
									/*}}}*/
// VerIterator::RelStr - Release description string			/*{{{*/
// ---------------------------------------------------------------------
/* This describes the version from a release-centric manner. The output is a 
   list of Label:Version/Archive */
string pkgCache::VerIterator::RelStr()
{
   bool First = true;
   string Res;
   for (pkgCache::VerFileIterator I = this->FileList(); I.end() == false; I++)
   {
      // Do not print 'not source' entries'
      pkgCache::PkgFileIterator File = I.File();
      if ((File->Flags & pkgCache::Flag::NotSource) == pkgCache::Flag::NotSource)
	 continue;

      // See if we have already printed this out..
      bool Seen = false;
      for (pkgCache::VerFileIterator J = this->FileList(); I != J; J++)
      {
	 pkgCache::PkgFileIterator File2 = J.File();
	 if (File2->Label == 0 || File->Label == 0)
	    continue;

	 if (strcmp(File.Label(),File2.Label()) != 0)
	    continue;
	 
	 if (File2->Version == File->Version)
	 {
	    Seen = true;
	    break;
	 }
	 if (File2->Version == 0 || File->Version == 0)
	    break;
	 if (strcmp(File.Version(),File2.Version()) == 0)
	    Seen = true;
      }
      
      if (Seen == true)
	 continue;
      
      if (First == false)
	 Res += ", ";
      else
	 First = false;
      
      if (File->Label != 0)
	 Res = Res + File.Label() + ':';

      if (File->Archive != 0)
      {
	 if (File->Version == 0)
	    Res += File.Archive();
	 else
	    Res = Res + File.Version() + '/' +  File.Archive();
      }
      else
      {
	 // No release file, print the host name that this came from
	 if (File->Site == 0 || File.Site()[0] == 0)
	    Res += "localhost";
	 else
	    Res += File.Site();
      }      
   }   
   return Res;
}
									/*}}}*/
// PkgFileIterator::IsOk - Checks if the cache is in sync with the file	/*{{{*/
// ---------------------------------------------------------------------
/* This stats the file and compares its stats with the ones that were
   stored during generation. Date checks should probably also be 
   included here. */
bool pkgCache::PkgFileIterator::IsOk()
{
   struct stat Buf;
   if (stat(FileName(),&Buf) != 0)
      return false;

   if (Buf.st_size != (signed)File->Size || Buf.st_mtime != File->mtime)
      return false;

   return true;
}
									/*}}}*/
// PkgFileIterator::RelStr - Return the release string			/*{{{*/
// ---------------------------------------------------------------------
/* */
string pkgCache::PkgFileIterator::RelStr()
{
   string Res;
   if (Version() != 0)
      Res = Res + (Res.empty() == true?"v=":",v=") + Version();
   if (Origin() != 0)
      Res = Res + (Res.empty() == true?"o=":",o=")  + Origin();
   if (Archive() != 0)
      Res = Res + (Res.empty() == true?"a=":",a=")  + Archive();
   if (Label() != 0)
      Res = Res + (Res.empty() == true?"l=":",l=")  + Label();
   if (Component() != 0)
      Res = Res + (Res.empty() == true?"c=":",c=")  + Component();
   return Res;
}
									/*}}}*/
// VerIterator::TranslatedDescription - Return the a DescIter for locale/*{{{*/
// ---------------------------------------------------------------------
/* return a DescIter for the current locale or the default if none is 
 * found
 */
pkgCache::DescIterator pkgCache::VerIterator::TranslatedDescription() const
{
   pkgCache::DescIterator DescDefault = DescriptionList();
   pkgCache::DescIterator Desc = DescDefault;
   for (; Desc.end() == false; Desc++)
      if (pkgIndexFile::LanguageCode() == Desc.LanguageCode())
	 break;
   if (Desc.end() == true) 
      Desc = DescDefault;
   return Desc;
};

									/*}}}*/