summaryrefslogtreecommitdiff
path: root/apt-pkg/deb/deblistparser.cc
blob: 3bcd381c0410846d9e89e20e0bfe0ca9719e014e (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
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
// -*- 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 <config.h>

#include <apt-pkg/deblistparser.h>
#include <apt-pkg/error.h>
#include <apt-pkg/configuration.h>
#include <apt-pkg/cachefilter.h>
#include <apt-pkg/aptconfiguration.h>
#include <apt-pkg/strutl.h>
#include <apt-pkg/crc-16.h>
#include <apt-pkg/md5.h>
#include <apt-pkg/pkgcache.h>
#include <apt-pkg/cacheiterators.h>
#include <apt-pkg/tagfile.h>
#include <apt-pkg/tagfile-keys.h>
#include <apt-pkg/macros.h>

#include <stddef.h>
#include <string.h>
#include <algorithm>
#include <string>
#include <vector>
#include <ctype.h>
									/*}}}*/

using std::string;
using APT::StringView;

static const debListParser::WordList PrioList[] = {
   {"required",pkgCache::State::Required},
   {"important",pkgCache::State::Important},
   {"standard",pkgCache::State::Standard},
   {"optional",pkgCache::State::Optional},
   {"extra",pkgCache::State::Extra},
   {"", 0}};

// 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) :
   pkgCacheListParser(), Tags(File)
{
   // this dance allows an empty value to override the default
   if (_config->Exists("pkgCacheGen::ForceEssential"))
   {
      forceEssential = _config->FindVector("pkgCacheGen::ForceEssential");
      if (forceEssential.empty() == false && _config->Find("pkgCacheGen::ForceEssential").empty())
	 forceEssential.emplace_back("apt");
   }
   else
      forceEssential.emplace_back("apt");
   forceImportant = _config->FindVector("pkgCacheGen::ForceImportant");
   Arch = _config->Find("APT::architecture");
}
									/*}}}*/
// ListParser::Package - Return the package name			/*{{{*/
// ---------------------------------------------------------------------
/* This is to return the name of the package this section describes */
string debListParser::Package() {
   string Result = Section.Find(pkgTagSection::Key::Package).to_string();

   // Normalize mixed case package names to lower case, like dpkg does
   // See Bug#807012 for details.
   // Only do this when the package name does not contain a / - as that
   // indicates that the package name was derived from a filename given
   // to install or build-dep or similar (Bug#854794)
   if (likely(Result.find('/') == string::npos))
   {
      for (char &c: Result)
      {
	 char l = tolower_ascii_inline(c);
	 if (unlikely(l != c))
	    c = l;
      }
   }

   if(unlikely(Result.empty() == true))
      _error->Warning("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 */
APT::StringView debListParser::Architecture() {
   auto const Arch = Section.Find(pkgTagSection::Key::Architecture);
   return Arch.empty() ? "none" : Arch;
}
									/*}}}*/
// ListParser::ArchitectureAll						/*{{{*/
// ---------------------------------------------------------------------
/* */
bool debListParser::ArchitectureAll() {
   return Section.Find(pkgTagSection::Key::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 */
APT::StringView debListParser::Version()
{
   return Section.Find(pkgTagSection::Key::Version);
}
									/*}}}*/
unsigned char debListParser::ParseMultiArch(bool const showErrors)	/*{{{*/
{
   unsigned char MA;
   auto const MultiArch = Section.Find(pkgTagSection::Key::Multi_Arch);
   if (MultiArch.empty() == true || MultiArch == "no")
      MA = pkgCache::Version::No;
   else if (MultiArch == "same") {
      if (ArchitectureAll() == true)
      {
	 if (showErrors == true)
	    _error->Warning("Architecture: all package '%s' can't be Multi-Arch: same",
		  Section.FindS("Package").c_str());
	 MA = pkgCache::Version::No;
      }
      else
	 MA = pkgCache::Version::Same;
   }
   else if (MultiArch == "foreign")
      MA = pkgCache::Version::Foreign;
   else if (MultiArch == "allowed")
      MA = pkgCache::Version::Allowed;
   else
   {
      if (showErrors == true)
	 _error->Warning("Unknown Multi-Arch type '%s' for package '%s'",
	       MultiArch.to_string().c_str(), Section.FindS("Package").c_str());
      MA = pkgCache::Version::No;
   }

   if (ArchitectureAll() == true)
      MA |= pkgCache::Version::All;

   return MA;
}
									/*}}}*/
// ListParser::NewVersion - Fill in the version structure		/*{{{*/
// ---------------------------------------------------------------------
/* */
bool debListParser::NewVersion(pkgCache::VerIterator &Ver)
{
   const char *Start;
   const char *Stop;

   if (Section.Find("Name",Start,Stop) == true)
   {
      Ver->Display = WriteString(Start, Stop - Start);
   }
   else if (Section.Find("Maemo-Display-Name",Start,Stop) == true)
   {
      Ver->Display = WriteString(Start, Stop - Start);
   }

   // Parse the section
   if (Section.Find(pkgTagSection::Key::Section,Start,Stop) == true)
   {
      map_stringitem_t const idx = StoreString(pkgCacheGenerator::SECTION, Start, Stop - Start);
      Ver->Section = idx;
   }
   // Parse the source package name
   pkgCache::GrpIterator G = Ver.ParentPkg().Group();
   Ver->SourcePkgName = G->Name;
   Ver->SourceVerStr = Ver->VerStr;
   if (Section.Find(pkgTagSection::Key::Source,Start,Stop) == true)
   {
      const char * const Space = (const char * const) memchr(Start, ' ', Stop - Start);
      pkgCache::VerIterator V;

      if (Space != NULL)
      {
	 const char * const Open = (const char * const) memchr(Space, '(', Stop - Space);
	 if (likely(Open != NULL))
	 {
	    const char * const Close = (const char * const) memchr(Open, ')', Stop - Open);
	    if (likely(Close != NULL))
	    {
	       APT::StringView const version(Open + 1, (Close - Open) - 1);
	       if (version != Ver.VerStr())
	       {
		  map_stringitem_t const idx = StoreString(pkgCacheGenerator::VERSIONNUMBER, version);
		  G = Ver.ParentPkg().Group();
		  Ver->SourceVerStr = idx;
	       }
	    }
	 }
	 Stop = Space;
      }

      APT::StringView const pkgname(Start, Stop - Start);
      if (pkgname != G.Name())
      {
	 for (pkgCache::PkgIterator P = G.PackageList(); P.end() == false; P = G.NextPkg(P))
	 {
	    for (V = P.VersionList(); V.end() == false; ++V)
	    {
	       if (pkgname == V.SourcePkgName())
	       {
		  Ver->SourcePkgName = V->SourcePkgName;
		  break;
	       }
	    }
	    if (V.end() == false)
	       break;
	 }
	 if (V.end() == true)
	 {
	    map_stringitem_t const idx = StoreString(pkgCacheGenerator::PKGNAME, pkgname);
	    G = Ver.ParentPkg().Group();
	    Ver->SourcePkgName = idx;
	 }
      }
   }

   Ver->MultiArch = ParseMultiArch(true);
   // Archive Size
   Ver->Size = Section.FindULL(pkgTagSection::Key::Size);
   // Unpacked Size (in K)
   Ver->InstalledSize = Section.FindULL(pkgTagSection::Key::Installed_Size);
   Ver->InstalledSize *= 1024;

   // Priority
   if (Section.Find(pkgTagSection::Key::Priority,Start,Stop) == true)
   {
      if (GrabWord(StringView(Start,Stop-Start),PrioList,Ver->Priority) == false)
	 Ver->Priority = pkgCache::State::Extra;
   }

   if (ParseDepends(Ver,pkgTagSection::Key::Pre_Depends,pkgCache::Dep::PreDepends) == false)
      return false;
   if (ParseDepends(Ver,pkgTagSection::Key::Depends,pkgCache::Dep::Depends) == false)
      return false;
   if (ParseDepends(Ver,pkgTagSection::Key::Conflicts,pkgCache::Dep::Conflicts) == false)
      return false;
   if (ParseDepends(Ver,pkgTagSection::Key::Breaks,pkgCache::Dep::DpkgBreaks) == false)
      return false;
   if (ParseDepends(Ver,pkgTagSection::Key::Recommends,pkgCache::Dep::Recommends) == false)
      return false;
   if (ParseDepends(Ver,pkgTagSection::Key::Suggests,pkgCache::Dep::Suggests) == false)
      return false;
   if (ParseDepends(Ver,pkgTagSection::Key::Replaces,pkgCache::Dep::Replaces) == false)
      return false;
   if (ParseDepends(Ver,pkgTagSection::Key::Enhances,pkgCache::Dep::Enhances) == false)
      return false;
   // Obsolete.
   if (ParseDepends(Ver,pkgTagSection::Key::Optional,pkgCache::Dep::Suggests) == false)
      return false;
   
   if (ParseProvides(Ver) == false)
      return false;
   if (ParseTag(Ver) == false)
      return false;
   
   return true;
}
									/*}}}*/
// ListParser::AvailableDescriptionLanguages				/*{{{*/
std::vector<std::string> debListParser::AvailableDescriptionLanguages()
{
   std::vector<std::string> const understood = APT::Configuration::getLanguages();
   std::vector<std::string> avail;
   static constexpr int prefixLen = 12;
   char buf[32] = "Description-";
   if (Section.Exists("Description") == true)
      avail.push_back("");
   for (std::vector<std::string>::const_iterator lang = understood.begin(); lang != understood.end(); ++lang)
   {
      if (unlikely(lang->size() > sizeof(buf) - prefixLen)) {
	 _error->Warning("Ignoring translated description %s", lang->c_str());
	 continue;
      }
      memcpy(buf + prefixLen, lang->c_str(), lang->size());
      if (Section.Exists(StringView(buf, prefixLen + lang->size())) == true)
	 avail.push_back(*lang);
   }
   return avail;
}
									/*}}}*/
// ListParser::Description_md5 - 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.
 */
APT::StringView debListParser::Description_md5()
{
   StringView const value = Section.Find(pkgTagSection::Key::Description_md5);
   if (unlikely(value.empty() == true))
   {
      StringView const desc = Section.Find(pkgTagSection::Key::Description);
      if (desc == "\n")
	 return StringView();

      MD5Summation md5;
      md5.Add(desc.data(), desc.size());
      md5.Add("\n");
      MD5Buffer = md5.Result();
      return StringView(MD5Buffer);
   }
   else if (likely(value.size() == 32))
   {
      return value;
   }
   _error->Error("Malformed Description-md5 line; doesn't have the required length (32 != %d) '%.*s'", (int)value.size(), (int)value.length(), value.data());
   return StringView();
}
                                                                        /*}}}*/
// 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)
{
   string const static myArch = _config->Find("APT::Architecture");
   // Possible values are: "all", "native", "installed" and "none"
   // The "installed" mode is handled by ParseStatus(), See #544481 and friends.
   string const static essential = _config->Find("pkgCacheGen::Essential", "all");
   if (essential == "all" ||
       (essential == "native" && Pkg->Arch != 0 && myArch == Pkg.Arch()))
      if (Section.FindFlag(pkgTagSection::Key::Essential,Pkg->Flags,pkgCache::Flag::Essential) == false)
	 return false;
   if (Section.FindFlag(pkgTagSection::Key::Important,Pkg->Flags,pkgCache::Flag::Important) == false)
      return false;

   if (std::find(forceEssential.begin(), forceEssential.end(), Pkg.Name()) != forceEssential.end())
   {
      if ((essential == "native" && Pkg->Arch != 0 && myArch == Pkg.Arch()) ||
	  essential == "all")
	 Pkg->Flags |= pkgCache::Flag::Essential | pkgCache::Flag::Important;
      else
	 Pkg->Flags |= pkgCache::Flag::Important;
   }
   else if (std::find(forceImportant.begin(), forceImportant.end(), Pkg.Name()) != forceImportant.end())
      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()
{
   static constexpr pkgTagSection::Key Sections[] ={
      pkgTagSection::Key::Installed_Size,
      pkgTagSection::Key::Depends,
      pkgTagSection::Key::Pre_Depends,
//    pkgTagSection::Key::Suggests,
//    pkgTagSection::Key::Recommends",
      pkgTagSection::Key::Conflicts,
      pkgTagSection::Key::Breaks,
      pkgTagSection::Key::Replaces};
   unsigned long Result = INIT_FCS;
   for (auto I : Sections)
   {
      const char *Start;
      const char *End;
      if (Section.Find(I,Start,End) == false)
	 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 < -> <=, so we drop all = from the
	 string to make that not matter. */
      for (; Start != End; ++Start)
      {
	 if (isspace_ascii(*Start) != 0 || *Start == '=')
	    continue;
	 Result = AddCRC16Byte(Result, tolower_ascii_unsafe(*Start));
      }


   }
   
   return Result;
}
									/*}}}*/
// StatusListParser::ParseStatus - Parse the status field		/*{{{*/
// ---------------------------------------------------------------------
/* Status lines are of the form,
     Status: want flag status
   want = unknown, install, hold, deinstall, purge
   flag = ok, reinstreq
   status = not-installed, config-files, half-installed, unpacked,
            half-configured, triggers-awaited, triggers-pending, installed
 */
bool debListParser::ParseStatus(pkgCache::PkgIterator &,
				pkgCache::VerIterator &)
{
   return true;
}
bool debStatusListParser::ParseStatus(pkgCache::PkgIterator &Pkg,
				pkgCache::VerIterator &Ver)
{
   const char *Start;
   const char *Stop;
   if (Section.Find(pkgTagSection::Key::Status,Start,Stop) == false)
      return true;

   // UsePackage() is responsible for setting the flag in the default case
   bool const static essential = _config->Find("pkgCacheGen::Essential", "") == "installed";
   if (essential == true &&
       Section.FindFlag(pkgTagSection::Key::Essential,Pkg->Flags,pkgCache::Flag::Essential) == false)
      return false;

   // 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},
                          {"", 0}};
   if (GrabWord(StringView(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},
                          {"", 0}};
   if (GrabWord(StringView(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},
                            {"config-files",pkgCache::State::ConfigFiles},
                            {"half-installed",pkgCache::State::HalfInstalled},
                            {"unpacked",pkgCache::State::UnPacked},
                            {"half-configured",pkgCache::State::HalfConfigured},
                            {"triggers-awaited",pkgCache::State::TriggersAwaited},
                            {"triggers-pending",pkgCache::State::TriggersPending},
                            {"installed",pkgCache::State::Installed},
                            {"", 0}};
   if (GrabWord(StringView(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,
               std::string &Package,std::string &Ver,unsigned int &Op)
   { return ParseDepends(Start, Stop, Package, Ver, Op, false, true, false); }
const char *debListParser::ParseDepends(const char *Start,const char *Stop,
               std::string &Package,std::string &Ver,unsigned int &Op,
               bool const &ParseArchFlags)
   { return ParseDepends(Start, Stop, Package, Ver, Op, ParseArchFlags, true, false); }
const char *debListParser::ParseDepends(const char *Start,const char *Stop,
               std::string &Package,std::string &Ver,unsigned int &Op,
               bool const &ParseArchFlags, bool const &StripMultiArch)
   { return ParseDepends(Start, Stop, Package, Ver, Op, ParseArchFlags, StripMultiArch, false); }
const char *debListParser::ParseDepends(const char *Start,const char *Stop,
					string &Package,string &Ver,
					unsigned int &Op, bool const &ParseArchFlags,
					bool const &StripMultiArch,
					bool const &ParseRestrictionsList)
{
   return debListParser::ParseDepends(Start, Stop, Package, Ver, Op, ParseArchFlags,
                                      StripMultiArch, ParseRestrictionsList,
                                      _config->Find("APT::Architecture"));
}

const char *debListParser::ParseDepends(const char *Start,const char *Stop,
					string &Package,string &Ver,
					unsigned int &Op, bool const &ParseArchFlags,
					bool const &StripMultiArch,
					bool const &ParseRestrictionsList,
				        string const &Arch)
{
   StringView PackageView;
   StringView VerView;

   auto res = ParseDepends(Start, Stop, PackageView, VerView, Op, (bool)ParseArchFlags,
   (bool) StripMultiArch, (bool) ParseRestrictionsList, Arch);
   Package = PackageView.to_string();
   Ver = VerView.to_string();

   return res;
}
const char *debListParser::ParseDepends(const char *Start,const char *Stop,
					StringView &Package,StringView &Ver,
					unsigned int &Op, bool ParseArchFlags,
					bool StripMultiArch,
					bool ParseRestrictionsList)
{
   return debListParser::ParseDepends(Start, Stop, Package, Ver, Op, ParseArchFlags,
                                      StripMultiArch, ParseRestrictionsList,
                                      _config->Find("APT::Architecture"));
}

const char *debListParser::ParseDepends(const char *Start,const char *Stop,
					StringView &Package,StringView &Ver,
					unsigned int &Op, bool ParseArchFlags,
					bool StripMultiArch,
					bool ParseRestrictionsList, string const &Arch)
{
   // Strip off leading space
   for (;Start != Stop && isspace_ascii(*Start) != 0; ++Start);
   
   // Parse off the package name
   const char *I = Start;
   for (;I != Stop && isspace_ascii(*I) == 0 && *I != '(' && *I != ')' &&
	*I != ',' && *I != '|' && *I != '[' && *I != ']' &&
	*I != '<' && *I != '>'; ++I);
   
   // Malformed, no '('
   if (I != Stop && *I == ')')
      return 0;

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

   // We don't want to confuse library users which can't handle MultiArch
   if (StripMultiArch == true) {
      string const arch = _config->Find("APT::Architecture");
      size_t const found = Package.rfind(':');
      if (found != StringView::npos &&
	  (Package.substr(found) == ":any" ||
	   Package.substr(found) == ":native" ||
	   Package.substr(found +1) == arch))
	 Package = Package.substr(0,found);
   }

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

   if (unlikely(ParseArchFlags == true))
   {
      APT::CacheFilter::PackageArchitectureMatchesSpecification matchesArch(Arch, false);

      // Parse an architecture
      if (I != Stop && *I == '[')
      {
	 ++I;
	 // malformed
	 if (unlikely(I == Stop))
	    return 0;

	 const char *End = I;
	 bool Found = false;
	 bool NegArch = false;
	 while (I != Stop)
	 {
	    // look for whitespace or ending ']'
	    for (;End != Stop && !isspace_ascii(*End) && *End != ']'; ++End);

	    if (unlikely(End == Stop))
	       return 0;

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

	    std::string const arch(I, End);
	    if (arch.empty() == false && matchesArch(arch.c_str()) == true)
	    {
	       Found = true;
	       if (I[-1] != '!')
		  NegArch = false;
	       // we found a match, so fast-forward to the end of the wildcards
	       for (; End != Stop && *End != ']'; ++End);
	    }

	    if (*End++ == ']') {
	       I = End;
	       break;
	    }

	    I = End;
	    for (;I != Stop && isspace_ascii(*I) != 0; I++);
	 }

	 if (NegArch == true)
	    Found = !Found;

	 if (Found == false)
	    Package = ""; /* not for this arch */
      }

      // Skip whitespace
      for (;I != Stop && isspace_ascii(*I) != 0; I++);
   }

   if (unlikely(ParseRestrictionsList == true))
   {
      // Parse a restrictions formula which is in disjunctive normal form:
      // (foo AND bar) OR (blub AND bla)

      std::vector<string> const profiles = APT::Configuration::getBuildProfiles();

      // if the next character is a restriction list, then by default the
      // dependency does not apply and the conditions have to be checked
      // if the next character is not a restriction list, then by default the
      // dependency applies
      bool applies1 = (*I != '<');
      while (I != Stop)
      {
	 if (*I != '<')
	     break;

	 ++I;
	 // malformed
	 if (unlikely(I == Stop))
	    return 0;

	 const char *End = I;

	 // if of the prior restriction list is already fulfilled, then
	 // we can just skip to the end of the current list
	 if (applies1) {
	    for (;End != Stop && *End != '>'; ++End);
	    I = ++End;
	    // skip whitespace
	    for (;I != Stop && isspace_ascii(*I) != 0; I++);
	 } else {
	    bool applies2 = true;
	    // all the conditions inside a restriction list have to be
	    // met so once we find one that is not met, we can skip to
	    // the end of this list
	    while (I != Stop)
	    {
	       // look for whitespace or ending '>'
	       // End now points to the character after the current term
	       for (;End != Stop && !isspace_ascii(*End) && *End != '>'; ++End);

	       if (unlikely(End == Stop))
		  return 0;

	       bool NegRestriction = false;
	       if (*I == '!')
	       {
		  NegRestriction = true;
		  ++I;
	       }

	       std::string const restriction(I, End);
	       if (restriction.empty() == false && profiles.empty() == false &&
		  std::find(profiles.begin(), profiles.end(), restriction) != profiles.end())
	       {
		  if (NegRestriction) {
		     applies2 = false;
		     // since one of the terms does not apply we don't have to check the others
		     for (; End != Stop && *End != '>'; ++End);
		  }
	       } else {
		  if (!NegRestriction) {
		     applies2 = false;
		     // since one of the terms does not apply we don't have to check the others
		     for (; End != Stop && *End != '>'; ++End);
		  }
	       }

	       if (*End++ == '>') {
		  I = End;
		  // skip whitespace
		  for (;I != Stop && isspace_ascii(*I) != 0; I++);
		  break;
	       }

	       I = End;
	       // skip whitespace
	       for (;I != Stop && isspace_ascii(*I) != 0; I++);
	    }
	    if (applies2) {
	       applies1 = true;
	    }
	 }
      }

      if (applies1 == false) {
	 Package = ""; //not for this restriction
      }
   }

   if (I != Stop && *I == '|')
      Op |= pkgCache::Dep::Or;
   
   if (I == Stop || *I == ',' || *I == '|')
   {
      if (I != Stop)
	 for (I++; I != Stop && isspace_ascii(*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,
				 pkgTagSection::Key Key,unsigned int Type)
{
   const char *Start;
   const char *Stop;
   if (Section.Find(Key,Start,Stop) == false || Start == Stop)
      return true;

   string const pkgArch = Ver.Arch();

   while (1)
   {
      StringView Package;
      StringView Version;
      unsigned int Op;

      Start = ParseDepends(Start, Stop, Package, Version, Op, false, false, false);
      if (Start == 0)
	 return _error->Warning("Problem parsing dependency %zu",static_cast<size_t>(Key)); // TODO
      size_t const found = Package.rfind(':');

      if (found == string::npos)
      {
	 if (NewDepends(Ver,Package,pkgArch,Version,Op,Type) == false)
	    return false;
      }
      else if (Package.substr(found) == ":any")
      {
	 if (NewDepends(Ver,Package,"any",Version,Op,Type) == false)
	    return false;
      }
      else
      {
	 // Such dependencies are not supposed to be accepted …
	 // … but this is probably the best thing to do anyway
	 if (Package.substr(found + 1) == "native")
	 {
	    std::string const Pkg = Package.substr(0, found).to_string() + ':' + Ver.Cache()->NativeArch();
	    if (NewDepends(Ver, Pkg, "any", Version, Op | pkgCache::Dep::ArchSpecific, Type) == false)
	       return false;
	 }
	 else if (NewDepends(Ver, Package, "any", Version, Op | pkgCache::Dep::ArchSpecific, Type) == false)
	    return false;
      }

      if (Start == Stop)
	 break;
   }
   return true;
}
									/*}}}*/
// ListParser::ParseProvides - Parse the provides list			/*{{{*/
// ---------------------------------------------------------------------
/* */
bool debListParser::ParseProvides(pkgCache::VerIterator &Ver)
{
   /* it is unlikely, but while parsing dependencies, we might have already
      picked up multi-arch implicit provides which we do not want to duplicate here */
   bool hasProvidesAlready = false;
   std::string const spzName = Ver.ParentPkg().FullName(false);
   {
      for (pkgCache::PrvIterator Prv = Ver.ProvidesList(); Prv.end() == false; ++Prv)
      {
	 if (Prv.IsMultiArchImplicit() == false || (Prv->Flags & pkgCache::Flag::ArchSpecific) == 0)
	    continue;
	 if (spzName != Prv.OwnerPkg().FullName(false))
	    continue;
	 hasProvidesAlready = true;
	 break;
      }
   }

   string const Arch = Ver.Arch();
   const char *Start;
   const char *Stop;
   if (Section.Find(pkgTagSection::Key::Provides,Start,Stop) == true)
   {
      StringView Package;
      StringView Version;
      unsigned int Op;

      do
      {
	 Start = ParseDepends(Start,Stop,Package,Version,Op, false, false, false);
	 const size_t archfound = Package.rfind(':');
	 if (Start == 0)
	    return _error->Warning("Problem parsing Provides line");
	 if (unlikely(Op != pkgCache::Dep::NoOp && Op != pkgCache::Dep::Equals)) {
	    _error->Warning("Ignoring Provides line with non-equal DepCompareOp for package %s", Package.to_string().c_str());
	 } else if (archfound != string::npos) {
	    StringView spzArch = Package.substr(archfound + 1);
	    if (spzArch != "any")
	    {
	       if (NewProvides(Ver, Package.substr(0, archfound), spzArch, Version, pkgCache::Flag::MultiArchImplicit | pkgCache::Flag::ArchSpecific) == false)
		  return false;
	    }
	    if (NewProvides(Ver, Package, "any", Version, pkgCache::Flag::ArchSpecific) == false)
	       return false;
	 } else if ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign) {
	    if (APT::Configuration::checkArchitecture(Arch))
	    {
	       if (NewProvidesAllArch(Ver, Package, Version, 0) == false)
		  return false;
	    }
	    else if (NewProvides(Ver, Package, Arch, Version, 0) == false)
	       return false;
	 } else {
	    if ((Ver->MultiArch & pkgCache::Version::Allowed) == pkgCache::Version::Allowed)
	    {
	       if (NewProvides(Ver, Package.to_string().append(":any"), "any", Version, pkgCache::Flag::MultiArchImplicit) == false)
		  return false;
	    }
	    if (NewProvides(Ver, Package, Arch, Version, 0) == false)
	       return false;
	 }
	 if (archfound == std::string::npos)
	 {
	    string spzName = Package.to_string();
	    spzName.push_back(':');
	    spzName.append(Ver.ParentPkg().Arch());
	    pkgCache::PkgIterator const spzPkg = Ver.Cache()->FindPkg(spzName, "any");
	    if (spzPkg.end() == false)
	    {
	       if (NewProvides(Ver, spzName, "any", Version, pkgCache::Flag::MultiArchImplicit | pkgCache::Flag::ArchSpecific) == false)
		  return false;
	    }
	 }
      } while (Start != Stop);
   }

   if (APT::Configuration::checkArchitecture(Arch))
   {
      if ((Ver->MultiArch & pkgCache::Version::Allowed) == pkgCache::Version::Allowed)
      {
	 string const Package = string(Ver.ParentPkg().Name()).append(":").append("any");
	 if (NewProvides(Ver, Package, "any", Ver.VerStr(), pkgCache::Flag::MultiArchImplicit) == false)
	    return false;
      }
      else if ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign)
      {
	 if (NewProvidesAllArch(Ver, Ver.ParentPkg().Name(), Ver.VerStr(), pkgCache::Flag::MultiArchImplicit) == false)
	    return false;
      }
   }

   if (hasProvidesAlready == false)
   {
      pkgCache::PkgIterator const spzPkg = Ver.Cache()->FindPkg(spzName, "any");
      if (spzPkg.end() == false)
      {
	 if (NewProvides(Ver, spzName, "any", Ver.VerStr(), pkgCache::Flag::MultiArchImplicit | pkgCache::Flag::ArchSpecific) == false)
	    return false;
      }
   }
   return true;
}
									/*}}}*/
// ListParser::ParseTag - Parse the tag list				/*{{{*/
// ---------------------------------------------------------------------
/* */
bool debListParser::ParseTag(pkgCache::VerIterator &Ver)
{
   const char *Start;
   const char *Stop;
   if (Section.Find("Tag",Start,Stop) == false)
      return true;

   while (1) {
      while (1) {
         if (Start == Stop)
            return true;
         if (Stop[-1] != ' ' && Stop[-1] != '\t')
            break;
         --Stop;
      }

      const char *Begin = Stop - 1;
      while (Begin != Start && Begin[-1] != ' ' && Begin[-1] != ',')
         --Begin;

      if (NewTag(Ver, Begin, Stop - Begin) == false)
         return false;

      while (1) {
         if (Begin == Start)
            return true;
         if (Begin[-1] == ',')
            break;
         --Begin;
      }

      Stop = Begin - 1;
   }

   return true;
}
									/*}}}*/
// ListParser::GrabWord - Matches a word and returns			/*{{{*/
// ---------------------------------------------------------------------
/* Looks for a word in a list of words - for ParseStatus */
bool debListParser::GrabWord(StringView Word, WordList const *List, unsigned char &Out)
{
   for (unsigned int C = 0; List[C].Str.empty() == false; C++)
   {
      if (Word.length() == List[C].Str.length() &&
	  strncasecmp(Word.data(), List[C].Str.data(), Word.length()) == 0)
      {
	 Out = List[C].Val;
	 return true;
      }
   }
   return false;
}
									/*}}}*/
// ListParser::Step - Move to the next section in the file		/*{{{*/
// ---------------------------------------------------------------------
/* This has to be careful to only process the correct architecture */
bool debListParser::Step()
{
   iOffset = Tags.Offset();
   return Tags.Step(Section);
}
									/*}}}*/
// 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;
}
									/*}}}*/
bool debListParser::SameVersion(unsigned short const Hash,		/*{{{*/
      pkgCache::VerIterator const &Ver)
{
   if (pkgCacheListParser::SameVersion(Hash, Ver) == false)
      return false;
   // status file has no (Download)Size, but all others are fair game
   // status file is parsed last, so the first version we encounter is
   // probably also the version we have downloaded
   unsigned long long const Size = Section.FindULL(pkgTagSection::Key::Size);
   if (Size != 0 && Ver->Size != 0 && Size != Ver->Size)
      return false;
   // available everywhere, but easier to check here than to include in VersionHash
   unsigned char MultiArch = ParseMultiArch(false);
   if (MultiArch != Ver->MultiArch)
      return false;
   // for all practical proposes (we can check): same version
   return true;
}
									/*}}}*/

debDebFileParser::debDebFileParser(FileFd *File, std::string const &DebFile)
   : debListParser(File), DebFile(DebFile)
{
}

bool debDebFileParser::UsePackage(pkgCache::PkgIterator &Pkg,
                                  pkgCache::VerIterator &Ver)
{
   bool res = debListParser::UsePackage(Pkg, Ver);
   // we use the full file path as a provides so that the file is found
   // by its name
   if(NewProvides(Ver, DebFile, Pkg.Cache()->NativeArch(), Ver.VerStr(), 0) == false)
      return false;
   return res;
}

debListParser::~debListParser() {}