summaryrefslogtreecommitdiff
path: root/apt-pkg/deb/deblistparser.cc
blob: 1948aedf30d90fb156850a229397c70bbb93c461 (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
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
// -*- mode: cpp; mode: fold -*-
// Description								/*{{{*/
// $Id: deblistparser.cc,v 1.29.2.5 2004/01/06 01:43:44 mdz Exp $
/* ######################################################################
   
   Package Cache Generator - Generator for the cache structure.
   
   This builds the cache structure from the abstract package list parser. 
   
   ##################################################################### */
									/*}}}*/
// Include Files							/*{{{*/
#include <apt-pkg/deblistparser.h>
#include <apt-pkg/error.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/aptconfiguration.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/crc-16.h>
#include <apt-pkg/md5.h>

#include <ctype.h>

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

static debListParser::WordList PrioList[] = {{"important",pkgCache::State::Important},
                       {"required",pkgCache::State::Required},
                       {"standard",pkgCache::State::Standard},
                       {"optional",pkgCache::State::Optional},
	               {"extra",pkgCache::State::Extra},
                       {}};

// ListParser::debListParser - Constructor				/*{{{*/
// ---------------------------------------------------------------------
/* Provide an architecture and only this one and "all" will be accepted
   in Step(), if no Architecture is given we will accept every arch
   we would accept in general with checkArchitecture() */
debListParser::debListParser(FileFd *File, string const &Arch) : Tags(File),
				Arch(Arch) {
	if (Arch == "native")
		this->Arch = _config->Find("APT::Architecture");
}
									/*}}}*/
// ListParser::UniqFindTagWrite - Find the tag and write a unq string	/*{{{*/
// ---------------------------------------------------------------------
/* */
unsigned long debListParser::UniqFindTagWrite(const char *Tag)
{
   const char *Start;
   const char *Stop;
   if (Section.Find(Tag,Start,Stop) == false)
      return 0;
   return WriteUniqString(Start,Stop - Start);
}
									/*}}}*/
// ListParser::Package - Return the package name			/*{{{*/
// ---------------------------------------------------------------------
/* This is to return the name of the package this section describes */
string debListParser::Package() {
	string const Result = Section.FindS("Package");
	if(unlikely(Result.empty() == true))
		_error->Error("Encountered a section with no Package: header");
	return Result;
}
									/*}}}*/
// ListParser::Architecture - Return the package arch			/*{{{*/
// ---------------------------------------------------------------------
/* This will return the Architecture of the package this section describes
   Note that architecture "all" packages will get the architecture of the
   Packages file parsed here. */
string debListParser::Architecture() {
	string const Result = Section.FindS("Architecture");
	if (Result.empty() == true || Result == "all") {
		if (Arch.empty() == true)
			/* FIXME: this is a problem for installed arch all
			   packages as we don't know from which arch this
			   package was installed - and therefore which
			   dependency this package resolves. */
			return _config->Find("APT::Architecture");
		else
			return Arch;
	}
	return Result;
}
									/*}}}*/
// ListParser::ArchitectureAll						/*{{{*/
// ---------------------------------------------------------------------
/* */
bool debListParser::ArchitectureAll() {
	return Section.FindS("Architecture") == "all";
}
									/*}}}*/
// ListParser::Version - Return the version string			/*{{{*/
// ---------------------------------------------------------------------
/* This is to return the string describing the version in debian form,
   epoch:upstream-release. If this returns the blank string then the 
   entry is assumed to only describe package properties */
string debListParser::Version()
{
   return Section.FindS("Version");
}
									/*}}}*/
// ListParser::NewVersion - Fill in the version structure		/*{{{*/
// ---------------------------------------------------------------------
/* */
bool debListParser::NewVersion(pkgCache::VerIterator Ver)
{
   // Parse the section
   Ver->Section = UniqFindTagWrite("Section");

   // Parse multi-arch
   if (Section.FindS("Architecture") == "all")
      /* Arch all packages can't have a Multi-Arch field,
         but we need a special treatment for them nonetheless */
      Ver->MultiArch = pkgCache::Version::All;
   else
   {
      string const MultiArch = Section.FindS("Multi-Arch");
      if (MultiArch.empty() == true)
	 Ver->MultiArch = pkgCache::Version::None;
      else if (MultiArch == "same")
	 Ver->MultiArch = pkgCache::Version::Same;
      else if (MultiArch == "foreign")
	 Ver->MultiArch = pkgCache::Version::Foreign;
      else if (MultiArch == "allowed")
	 Ver->MultiArch = pkgCache::Version::Allowed;
      else
      {
	 _error->Warning("Unknown Multi-Arch type »%s« for package »%s«",
			MultiArch.c_str(), Section.FindS("Package").c_str());
	 Ver->MultiArch = pkgCache::Version::None;
      }
   }

   // Archive Size
   Ver->Size = (unsigned)Section.FindI("Size");
   
   // Unpacked Size (in K)
   Ver->InstalledSize = (unsigned)Section.FindI("Installed-Size");
   Ver->InstalledSize *= 1024;

   // Priority
   const char *Start;
   const char *Stop;
   if (Section.Find("Priority",Start,Stop) == true)
   {      
      if (GrabWord(string(Start,Stop-Start),PrioList,Ver->Priority) == false)
	 Ver->Priority = pkgCache::State::Extra;
   }

   if (Ver->MultiArch == pkgCache::Version::All)
   {
      /* We maintain a "pseudo" arch=all package for architecture all versions
	 on which these versions can depend on. This pseudo package is many used
	 for downloading/installing: The other pseudo-packages will degenerate
	 to a NOP in the download/install step - this package will ensure that
	 it is downloaded only one time and installed only one time -- even if
	 the architecture bound versions coming in and out on regular basis. */
      if (strcmp(Ver.Arch(true),"all") == 0)
	 return true;
      else if (Ver.Pseudo() == true)
      {
	 // our pseudo packages have no size to not confuse the fetcher
	 Ver->Size = 0;
	 Ver->InstalledSize = 0;
      }
   }

   if (ParseDepends(Ver,"Depends",pkgCache::Dep::Depends) == false)
      return false;
   if (ParseDepends(Ver,"Pre-Depends",pkgCache::Dep::PreDepends) == false)
      return false;
   if (ParseDepends(Ver,"Suggests",pkgCache::Dep::Suggests) == false)
      return false;
   if (ParseDepends(Ver,"Recommends",pkgCache::Dep::Recommends) == false)
      return false;
   if (ParseDepends(Ver,"Conflicts",pkgCache::Dep::Conflicts) == false)
      return false;
   if (ParseDepends(Ver,"Breaks",pkgCache::Dep::DpkgBreaks) == false)
      return false;
   if (ParseDepends(Ver,"Replaces",pkgCache::Dep::Replaces) == false)
      return false;
   if (ParseDepends(Ver,"Enhances",pkgCache::Dep::Enhances) == false)
      return false;

   // Obsolete.
   if (ParseDepends(Ver,"Optional",pkgCache::Dep::Suggests) == false)
      return false;
   
   if (ParseProvides(Ver) == false)
      return false;
   
   return true;
}
									/*}}}*/
// ListParser::Description - Return the description string		/*{{{*/
// ---------------------------------------------------------------------
/* This is to return the string describing the package in debian
   form. If this returns the blank string then the entry is assumed to
   only describe package properties */
string debListParser::Description()
{
   string const lang = DescriptionLanguage();
   if (lang.empty())
      return Section.FindS("Description");
   else
      return Section.FindS(string("Description-").append(lang).c_str());
}
                                                                        /*}}}*/
// ListParser::DescriptionLanguage - Return the description lang string	/*{{{*/
// ---------------------------------------------------------------------
/* This is to return the string describing the language of
   description. If this returns the blank string then the entry is
   assumed to describe original description. */
string debListParser::DescriptionLanguage()
{
   if (Section.FindS("Description").empty() == false)
      return "";

   std::vector<string> const lang = APT::Configuration::getLanguages();
   for (std::vector<string>::const_iterator l = lang.begin();
	l != lang.end(); l++)
      if (Section.FindS(string("Description-").append(*l).c_str()).empty() == false)
	 return *l;

   return "";
}
                                                                        /*}}}*/
// ListParser::Description - Return the description_md5 MD5SumValue	/*{{{*/
// ---------------------------------------------------------------------
/* This is to return the md5 string to allow the check if it is the right
   description. If no Description-md5 is found in the section it will be
   calculated.
 */
MD5SumValue debListParser::Description_md5()
{
   string value = Section.FindS("Description-md5");

   if (value.empty()) 
   {
      MD5Summation md5;
      md5.Add((Description() + "\n").c_str());
      return md5.Result();
   } else
      return MD5SumValue(value);
}
                                                                        /*}}}*/
// ListParser::UsePackage - Update a package structure			/*{{{*/
// ---------------------------------------------------------------------
/* This is called to update the package with any new information 
   that might be found in the section */
bool debListParser::UsePackage(pkgCache::PkgIterator Pkg,
			       pkgCache::VerIterator Ver)
{
   if (Pkg->Section == 0)
      Pkg->Section = UniqFindTagWrite("Section");

   // Packages which are not from "our" arch doesn't get the essential flag
   string const static myArch = _config->Find("APT::Architecture");
   if (Pkg->Arch != 0 && myArch == Pkg.Arch())
      if (Section.FindFlag("Essential",Pkg->Flags,pkgCache::Flag::Essential) == false)
	 return false;
   if (Section.FindFlag("Important",Pkg->Flags,pkgCache::Flag::Important) == false)
      return false;

   if (strcmp(Pkg.Name(),"apt") == 0)
      Pkg->Flags |= pkgCache::Flag::Important;
   
   if (ParseStatus(Pkg,Ver) == false)
      return false;
   return true;
}
									/*}}}*/
// ListParser::VersionHash - Compute a unique hash for this version	/*{{{*/
// ---------------------------------------------------------------------
/* */
unsigned short debListParser::VersionHash()
{
   const char *Sections[] ={"Installed-Size",
                            "Depends",
                            "Pre-Depends",
//                            "Suggests",
//                            "Recommends",
                            "Conflicts",
                            "Breaks",
                            "Replaces",0};
   unsigned long Result = INIT_FCS;
   char S[1024];
   for (const char **I = Sections; *I != 0; I++)
   {
      const char *Start;
      const char *End;
      if (Section.Find(*I,Start,End) == false || End - Start >= (signed)sizeof(S))
	 continue;
      
      /* Strip out any spaces from the text, this undoes dpkgs reformatting
         of certain fields. dpkg also has the rather interesting notion of
         reformatting depends operators < -> <= */
      char *I = S;
      for (; Start != End; Start++)
      {
	 if (isspace(*Start) == 0)
	    *I++ = tolower_ascii(*Start);
	 if (*Start == '<' && Start[1] != '<' && Start[1] != '=')
	    *I++ = '=';
	 if (*Start == '>' && Start[1] != '>' && Start[1] != '=')
	    *I++ = '=';
      }

      Result = AddCRC16(Result,S,I - S);
   }
   
   return Result;
}
									/*}}}*/
// ListParser::ParseStatus - Parse the status field			/*{{{*/
// ---------------------------------------------------------------------
/* Status lines are of the form,
     Status: want flag status
   want = unknown, install, hold, deinstall, purge
   flag = ok, reinstreq, hold, hold-reinstreq
   status = not-installed, unpacked, half-configured,
            half-installed, config-files, post-inst-failed, 
            removal-failed, installed
   
   Some of the above are obsolete (I think?) flag = hold-* and 
   status = post-inst-failed, removal-failed at least.
 */
bool debListParser::ParseStatus(pkgCache::PkgIterator Pkg,
				pkgCache::VerIterator Ver)
{
   const char *Start;
   const char *Stop;
   if (Section.Find("Status",Start,Stop) == false)
      return true;
   
   // Isolate the first word
   const char *I = Start;
   for(; I < Stop && *I != ' '; I++);
   if (I >= Stop || *I != ' ')
      return _error->Error("Malformed Status line");

   // Process the want field
   WordList WantList[] = {{"unknown",pkgCache::State::Unknown},
                          {"install",pkgCache::State::Install},
                          {"hold",pkgCache::State::Hold},
                          {"deinstall",pkgCache::State::DeInstall},
                          {"purge",pkgCache::State::Purge},
                          {}};
   if (GrabWord(string(Start,I-Start),WantList,Pkg->SelectedState) == false)
      return _error->Error("Malformed 1st word in the Status line");

   // Isloate the next word
   I++;
   Start = I;
   for(; I < Stop && *I != ' '; I++);
   if (I >= Stop || *I != ' ')
      return _error->Error("Malformed status line, no 2nd word");

   // Process the flag field
   WordList FlagList[] = {{"ok",pkgCache::State::Ok},
                          {"reinstreq",pkgCache::State::ReInstReq},
                          {"hold",pkgCache::State::HoldInst},
                          {"hold-reinstreq",pkgCache::State::HoldReInstReq},
                          {}};
   if (GrabWord(string(Start,I-Start),FlagList,Pkg->InstState) == false)
      return _error->Error("Malformed 2nd word in the Status line");

   // Isloate the last word
   I++;
   Start = I;
   for(; I < Stop && *I != ' '; I++);
   if (I != Stop)
      return _error->Error("Malformed Status line, no 3rd word");

   // Process the flag field
   WordList StatusList[] = {{"not-installed",pkgCache::State::NotInstalled},
                            {"unpacked",pkgCache::State::UnPacked},
                            {"half-configured",pkgCache::State::HalfConfigured},
                            {"installed",pkgCache::State::Installed},
                            {"half-installed",pkgCache::State::HalfInstalled},
                            {"config-files",pkgCache::State::ConfigFiles},
                            {"triggers-awaited",pkgCache::State::TriggersAwaited},
                            {"triggers-pending",pkgCache::State::TriggersPending},
                            {"post-inst-failed",pkgCache::State::HalfConfigured},
                            {"removal-failed",pkgCache::State::HalfInstalled},
                            {}};
   if (GrabWord(string(Start,I-Start),StatusList,Pkg->CurrentState) == false)
      return _error->Error("Malformed 3rd word in the Status line");

   /* A Status line marks the package as indicating the current
      version as well. Only if it is actually installed.. Otherwise
      the interesting dpkg handling of the status file creates bogus 
      entries. */
   if (!(Pkg->CurrentState == pkgCache::State::NotInstalled ||
	 Pkg->CurrentState == pkgCache::State::ConfigFiles))
   {
      if (Ver.end() == true)
	 _error->Warning("Encountered status field in a non-version description");
      else
	 Pkg->CurrentVer = Ver.Index();
   }
   
   return true;
}

const char *debListParser::ConvertRelation(const char *I,unsigned int &Op)
{
   // Determine the operator
   switch (*I)
   {
      case '<':
      I++;
      if (*I == '=')
      {
	 I++;
	 Op = pkgCache::Dep::LessEq;
	 break;
      }
      
      if (*I == '<')
      {
	 I++;
	 Op = pkgCache::Dep::Less;
	 break;
      }
      
      // < is the same as <= and << is really Cs < for some reason
      Op = pkgCache::Dep::LessEq;
      break;
      
      case '>':
      I++;
      if (*I == '=')
      {
	 I++;
	 Op = pkgCache::Dep::GreaterEq;
	 break;
      }
      
      if (*I == '>')
      {
	 I++;
	 Op = pkgCache::Dep::Greater;
	 break;
      }
      
      // > is the same as >= and >> is really Cs > for some reason
      Op = pkgCache::Dep::GreaterEq;
      break;
      
      case '=':
      Op = pkgCache::Dep::Equals;
      I++;
      break;
      
      // HACK around bad package definitions
      default:
      Op = pkgCache::Dep::Equals;
      break;
   }
   return I;
}

									/*}}}*/
// ListParser::ParseDepends - Parse a dependency element		/*{{{*/
// ---------------------------------------------------------------------
/* This parses the dependency elements out of a standard string in place,
   bit by bit. */
const char *debListParser::ParseDepends(const char *Start,const char *Stop,
					string &Package,string &Ver,
					unsigned int &Op, bool const &ParseArchFlags,
					bool const &StripMultiArch)
{
   // Strip off leading space
   for (;Start != Stop && isspace(*Start) != 0; Start++);
   
   // Parse off the package name
   const char *I = Start;
   for (;I != Stop && isspace(*I) == 0 && *I != '(' && *I != ')' &&
	*I != ',' && *I != '|'; I++);
   
   // Malformed, no '('
   if (I != Stop && *I == ')')
      return 0;

   if (I == Start)
      return 0;
   
   // Stash the package name
   Package.assign(Start,I - Start);

   // We don't want to confuse library users which can't handle MultiArch
   if (StripMultiArch == true) {
      size_t const found = Package.rfind(':');
      if (found != string::npos)
	 Package = Package.substr(0,found);
   }

   // Skip white space to the '('
   for (;I != Stop && isspace(*I) != 0 ; I++);
   
   // Parse a version
   if (I != Stop && *I == '(')
   {
      // Skip the '('
      for (I++; I != Stop && isspace(*I) != 0 ; I++);
      if (I + 3 >= Stop)
	 return 0;
      I = ConvertRelation(I,Op);
      
      // Skip whitespace
      for (;I != Stop && isspace(*I) != 0; I++);
      Start = I;
      for (;I != Stop && *I != ')'; I++);
      if (I == Stop || Start == I)
	 return 0;     
      
      // Skip trailing whitespace
      const char *End = I;
      for (; End > Start && isspace(End[-1]); End--);
      
      Ver.assign(Start,End-Start);
      I++;
   }
   else
   {
      Ver.clear();
      Op = pkgCache::Dep::NoOp;
   }
   
   // Skip whitespace
   for (;I != Stop && isspace(*I) != 0; I++);

   if (ParseArchFlags == true)
   {
      string arch = _config->Find("APT::Architecture");

      // Parse an architecture
      if (I != Stop && *I == '[')
      {
	 // malformed
         I++;
         if (I == Stop)
	    return 0; 
	 
         const char *End = I;
         bool Found = false;
      	 bool NegArch = false;
         while (I != Stop) 
	 {
            // look for whitespace or ending ']'
	    while (End != Stop && !isspace(*End) && *End != ']') 
	       End++;
	 
	    if (End == Stop) 
	       return 0;

	    if (*I == '!')
            {
	       NegArch = true;
	       I++;
            }

	    if (stringcmp(arch,I,End) == 0)
	       Found = true;
	    
	    if (*End++ == ']') {
	       I = End;
	       break;
	    }
	    
	    I = End;
	    for (;I != Stop && isspace(*I) != 0; I++);
         }

	 if (NegArch)
	    Found = !Found;
	 
         if (Found == false)
	    Package = ""; /* not for this arch */
      }
      
      // Skip whitespace
      for (;I != Stop && isspace(*I) != 0; I++);
   }

   if (I != Stop && *I == '|')
      Op |= pkgCache::Dep::Or;
   
   if (I == Stop || *I == ',' || *I == '|')
   {
      if (I != Stop)
	 for (I++; I != Stop && isspace(*I) != 0; I++);
      return I;
   }
   
   return 0;
}
									/*}}}*/
// ListParser::ParseDepends - Parse a dependency list			/*{{{*/
// ---------------------------------------------------------------------
/* This is the higher level depends parser. It takes a tag and generates
   a complete depends tree for the given version. */
bool debListParser::ParseDepends(pkgCache::VerIterator Ver,
				 const char *Tag,unsigned int Type)
{
   const char *Start;
   const char *Stop;
   if (Section.Find(Tag,Start,Stop) == false)
      return true;
   
   string Package;
   string const pkgArch = Ver.Arch(true);
   string Version;
   unsigned int Op;

   while (1)
   {
      Start = ParseDepends(Start,Stop,Package,Version,Op);
      if (Start == 0)
	 return _error->Error("Problem parsing dependency %s",Tag);
      
      if (NewDepends(Ver,Package,pkgArch,Version,Op,Type) == false)
	 return false;
      if (Start == Stop)
	 break;
   }
   return true;
}
									/*}}}*/
// ListParser::ParseProvides - Parse the provides list			/*{{{*/
// ---------------------------------------------------------------------
/* */
bool debListParser::ParseProvides(pkgCache::VerIterator Ver)
{
   const char *Start;
   const char *Stop;
   if (Section.Find("Provides",Start,Stop) == true)
   {
      string Package;
      string Version;
      string const Arch = Ver.Arch(true);
      unsigned int Op;

      while (1)
      {
	 Start = ParseDepends(Start,Stop,Package,Version,Op);
	 if (Start == 0)
	    return _error->Error("Problem parsing Provides line");
	 if (Op != pkgCache::Dep::NoOp) {
	    _error->Warning("Ignoring Provides line with DepCompareOp for package %s", Package.c_str());
	 } else {
	    if (NewProvides(Ver, Package, Arch, Version) == false)
	       return false;
	 }

	 if (Start == Stop)
	    break;
      }
   }

   if (Ver->MultiArch == pkgCache::Version::Allowed)
   {
      string const Package = string(Ver.ParentPkg().Name()).append(":").append("any");
      NewProvides(Ver, Package, "any", Ver.VerStr());
   }

   if (Ver->MultiArch != pkgCache::Version::Foreign)
      return true;

   std::vector<string> const archs = APT::Configuration::getArchitectures();
   if (archs.size() <= 1)
      return true;

   string const Package = Ver.ParentPkg().Name();
   string const Version = Ver.VerStr();
   for (std::vector<string>::const_iterator a = archs.begin();
	a != archs.end(); ++a)
   {
      if (NewProvides(Ver, Package, *a, Version) == false)
	 return false;
   }

   return true;
}
									/*}}}*/
// ListParser::GrabWord - Matches a word and returns			/*{{{*/
// ---------------------------------------------------------------------
/* Looks for a word in a list of words - for ParseStatus */
bool debListParser::GrabWord(string Word,WordList *List,unsigned char &Out)
{
   for (unsigned int C = 0; List[C].Str != 0; C++)
   {
      if (strcasecmp(Word.c_str(),List[C].Str) == 0)
      {
	 Out = List[C].Val;
	 return true;
      }
   }
   return false;
}
									/*}}}*/
// ListParser::Step - Move to the next section in the file		/*{{{*/
// ---------------------------------------------------------------------
/* This has to be carefull to only process the correct architecture */
bool debListParser::Step()
{
   iOffset = Tags.Offset();
   while (Tags.Step(Section) == true)
   {      
      /* See if this is the correct Architecture, if it isn't then we
         drop the whole section. A missing arch tag only happens (in theory)
         inside the Status file, so that is a positive return */
      string const Architecture = Section.FindS("Architecture");
      if (Architecture.empty() == true)
	 return true;

      if (Arch.empty() == true)
      {
	 if (APT::Configuration::checkArchitecture(Architecture) == true)
	    return true;
      }
      else
      {
	 if (Architecture == Arch)
	    return true;

	 if (Architecture == "all")
	    return true;
      }

      iOffset = Tags.Offset();
   }   
   return false;
}
									/*}}}*/
// ListParser::LoadReleaseInfo - Load the release information		/*{{{*/
// ---------------------------------------------------------------------
/* */
bool debListParser::LoadReleaseInfo(pkgCache::PkgFileIterator FileI,
				    FileFd &File, string component)
{
   pkgTagFile Tags(&File, File.Size() + 256); // XXX
   pkgTagSection Section;
   if (Tags.Step(Section) == false)
      return false;

   // FIXME: Do we need it now for multi-arch?
   // mvo: I don't think we need to fill that in (it's unused since apt-0.6)
//    FileI->Architecture = WriteUniqString(Arch);
   
   // apt-secure does no longer download individual (per-section) Release
   // file. to provide Component pinning we use the section name now
   FileI->Component = WriteUniqString(component);

   const char *Start;
   const char *Stop;
   if (Section.Find("Suite",Start,Stop) == true)
      FileI->Archive = WriteUniqString(Start,Stop - Start);
   if (Section.Find("Component",Start,Stop) == true)
      FileI->Component = WriteUniqString(Start,Stop - Start);
   if (Section.Find("Version",Start,Stop) == true)
      FileI->Version = WriteUniqString(Start,Stop - Start);
   if (Section.Find("Origin",Start,Stop) == true)
      FileI->Origin = WriteUniqString(Start,Stop - Start);
   if (Section.Find("Codename",Start,Stop) == true)
      FileI->Codename = WriteUniqString(Start,Stop - Start);
   if (Section.Find("Label",Start,Stop) == true)
      FileI->Label = WriteUniqString(Start,Stop - Start);
   if (Section.Find("Architecture",Start,Stop) == true)
      FileI->Architecture = WriteUniqString(Start,Stop - Start);
   
   if (Section.FindFlag("NotAutomatic",FileI->Flags,
			pkgCache::Flag::NotAutomatic) == false)
      _error->Warning("Bad NotAutomatic flag");

   return !_error->PendingError();
}
									/*}}}*/
// ListParser::GetPrio - Convert the priority from a string		/*{{{*/
// ---------------------------------------------------------------------
/* */
unsigned char debListParser::GetPrio(string Str)
{
   unsigned char Out;
   if (GrabWord(Str,PrioList,Out) == false)
      Out = pkgCache::State::Extra;
   
   return Out;
}
									/*}}}*/