X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/3952f883f3b60aaebe538afe3e8fb2b9f75c9262..c4d749b78a46e69887ec9662851f180e587f2d34:/apt-pkg/deb/deblistparser.cc

diff --git a/apt-pkg/deb/deblistparser.cc b/apt-pkg/deb/deblistparser.cc
index 59c4ee365..a1bcfb710 100644
--- a/apt-pkg/deb/deblistparser.cc
+++ b/apt-pkg/deb/deblistparser.cc
@@ -10,25 +10,40 @@
    ##################################################################### */
 									/*}}}*/
 // 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/fileutl.h>
 #include <apt-pkg/crc-16.h>
 #include <apt-pkg/md5.h>
+#include <apt-pkg/mmap.h>
+#include <apt-pkg/pkgcache.h>
+#include <apt-pkg/cacheiterators.h>
+#include <apt-pkg/tagfile.h>
 #include <apt-pkg/macros.h>
 
-#include <fnmatch.h>
+#include <stddef.h>
+#include <string.h>
+#include <algorithm>
+#include <string>
+#include <vector>
 #include <ctype.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},
-                       {}};
+using std::string;
+
+static debListParser::WordList PrioList[] = {
+   {"required",pkgCache::State::Required},
+   {"important",pkgCache::State::Important},
+   {"standard",pkgCache::State::Standard},
+   {"optional",pkgCache::State::Optional},
+   {"extra",pkgCache::State::Extra},
+   {NULL, 0}};
 
 // ListParser::debListParser - Constructor				/*{{{*/
 // ---------------------------------------------------------------------
@@ -69,10 +84,7 @@ string debListParser::Package() {
 // ---------------------------------------------------------------------
 /* This will return the Architecture of the package this section describes */
 string debListParser::Architecture() {
-   std::string const Arch = Section.FindS("Architecture");
-   if (Arch.empty() == true)
-      return _config->Find("APT::Architecture");
-   return Arch;
+   return Section.FindS("Architecture");
 }
 									/*}}}*/
 // ListParser::ArchitectureAll						/*{{{*/
@@ -92,44 +104,49 @@ string debListParser::Version()
    return Section.FindS("Version");
 }
 									/*}}}*/
-// ListParser::NewVersion - Fill in the version structure		/*{{{*/
-// ---------------------------------------------------------------------
-/* */
-bool debListParser::NewVersion(pkgCache::VerIterator &Ver)
+unsigned char debListParser::ParseMultiArch(bool const showErrors)	/*{{{*/
 {
-   // Parse the section
-   Ver->Section = UniqFindTagWrite("Section");
-
-   // Parse multi-arch
+   unsigned char MA;
    string const MultiArch = Section.FindS("Multi-Arch");
    if (MultiArch.empty() == true)
-      Ver->MultiArch = pkgCache::Version::None;
+      MA = pkgCache::Version::None;
    else if (MultiArch == "same") {
-      // Parse multi-arch
       if (ArchitectureAll() == true)
       {
-	 /* Arch all packages can't be Multi-Arch: same */
-	 _error->Warning("Architecture: all package '%s' can't be Multi-Arch: same",
-			Section.FindS("Package").c_str());
-	 Ver->MultiArch = pkgCache::Version::None;
+	 if (showErrors == true)
+	    _error->Warning("Architecture: all package '%s' can't be Multi-Arch: same",
+		  Section.FindS("Package").c_str());
+	 MA = pkgCache::Version::None;
       }
       else
-	 Ver->MultiArch = pkgCache::Version::Same;
+	 MA = pkgCache::Version::Same;
    }
    else if (MultiArch == "foreign")
-      Ver->MultiArch = pkgCache::Version::Foreign;
+      MA = pkgCache::Version::Foreign;
    else if (MultiArch == "allowed")
-      Ver->MultiArch = pkgCache::Version::Allowed;
+      MA = 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;
+      if (showErrors == true)
+	 _error->Warning("Unknown Multi-Arch type '%s' for package '%s'",
+	       MultiArch.c_str(), Section.FindS("Package").c_str());
+      MA = pkgCache::Version::None;
    }
 
    if (ArchitectureAll() == true)
-      Ver->MultiArch |= pkgCache::Version::All;
+      MA |= pkgCache::Version::All;
 
+   return MA;
+}
+									/*}}}*/
+// ListParser::NewVersion - Fill in the version structure		/*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool debListParser::NewVersion(pkgCache::VerIterator &Ver)
+{
+   // Parse the section
+   Ver->Section = UniqFindTagWrite("Section");
+   Ver->MultiArch = ParseMultiArch(true);
    // Archive Size
    Ver->Size = Section.FindULL("Size");
    // Unpacked Size (in K)
@@ -198,7 +215,7 @@ string debListParser::DescriptionLanguage()
 
    std::vector<string> const lang = APT::Configuration::getLanguages(true);
    for (std::vector<string>::const_iterator l = lang.begin();
-	l != lang.end(); l++)
+	l != lang.end(); ++l)
       if (Section.FindS(string("Description-").append(*l).c_str()).empty() == false)
 	 return *l;
 
@@ -213,15 +230,26 @@ string debListParser::DescriptionLanguage()
  */
 MD5SumValue debListParser::Description_md5()
 {
-   string value = Section.FindS("Description-md5");
-
-   if (value.empty()) 
+   string const value = Section.FindS("Description-md5");
+   if (value.empty() == true)
    {
+      std::string const desc = Description() + "\n";
+      if (desc == "\n")
+	 return MD5SumValue();
+
       MD5Summation md5;
-      md5.Add((Description() + "\n").c_str());
+      md5.Add(desc.c_str());
       return md5.Result();
-   } else
-      return MD5SumValue(value);
+   }
+   else if (likely(value.size() == 32))
+   {
+      if (likely(value.find_first_not_of("0123456789abcdefABCDEF") == string::npos))
+	 return MD5SumValue(value);
+      _error->Error("Malformed Description-md5 line; includes invalid character '%s'", value.c_str());
+      return MD5SumValue();
+   }
+   _error->Error("Malformed Description-md5 line; doesn't have the required length (32 != %d) '%s'", (int)value.size(), value.c_str());
+   return MD5SumValue();
 }
                                                                         /*}}}*/
 // ListParser::UsePackage - Update a package structure			/*{{{*/
@@ -234,21 +262,26 @@ bool debListParser::UsePackage(pkgCache::PkgIterator &Pkg,
    if (Pkg->Section == 0)
       Pkg->Section = UniqFindTagWrite("Section");
 
-   // Packages which are not from the "native" arch doesn't get the essential flag
-   // in the default "native" mode - it is also possible to mark "all" or "none".
-   // The "installed" mode is handled by ParseStatus(), See #544481 and friends.
    string const static myArch = _config->Find("APT::Architecture");
-   string const static essential = _config->Find("pkgCacheGen::Essential", "native");
-   if ((essential == "native" && Pkg->Arch != 0 && myArch == Pkg.Arch()) ||
-       essential == "all")
+   // 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("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 ((essential == "native" && Pkg->Arch != 0 && myArch == Pkg.Arch()) ||
+	  essential == "all")
+	 Pkg->Flags |= pkgCache::Flag::Essential | pkgCache::Flag::Important;
+      else
+	 Pkg->Flags |= pkgCache::Flag::Important;
+   }
+
    if (ParseStatus(Pkg,Ver) == false)
       return false;
    return true;
@@ -269,7 +302,7 @@ unsigned short debListParser::VersionHash()
                             "Replaces",0};
    unsigned long Result = INIT_FCS;
    char S[1024];
-   for (const char **I = Sections; *I != 0; I++)
+   for (const char * const *I = Sections; *I != 0; ++I)
    {
       const char *Start;
       const char *End;
@@ -280,13 +313,13 @@ unsigned short debListParser::VersionHash()
          of certain fields. dpkg also has the rather interesting notion of
          reformatting depends operators < -> <= */
       char *J = S;
-      for (; Start != End; Start++)
+      for (; Start != End; ++Start)
       {
-	 if (isspace(*Start) == 0)
-	    *J++ = tolower_ascii(*Start);
-	 if (*Start == '<' && Start[1] != '<' && Start[1] != '=')
-	    *J++ = '=';
-	 if (*Start == '>' && Start[1] != '>' && Start[1] != '=')
+	 if (isspace(*Start) != 0)
+	    continue;
+	 *J++ = tolower_ascii(*Start);
+
+	 if ((*Start == '<' || *Start == '>') && Start[1] != *Start && Start[1] != '=')
 	    *J++ = '=';
       }
 
@@ -335,7 +368,7 @@ bool debListParser::ParseStatus(pkgCache::PkgIterator &Pkg,
                           {"hold",pkgCache::State::Hold},
                           {"deinstall",pkgCache::State::DeInstall},
                           {"purge",pkgCache::State::Purge},
-                          {}};
+                          {NULL, 0}};
    if (GrabWord(string(Start,I-Start),WantList,Pkg->SelectedState) == false)
       return _error->Error("Malformed 1st word in the Status line");
 
@@ -351,7 +384,7 @@ bool debListParser::ParseStatus(pkgCache::PkgIterator &Pkg,
                           {"reinstreq",pkgCache::State::ReInstReq},
                           {"hold",pkgCache::State::HoldInst},
                           {"hold-reinstreq",pkgCache::State::HoldReInstReq},
-                          {}};
+                          {NULL, 0}};
    if (GrabWord(string(Start,I-Start),FlagList,Pkg->InstState) == false)
       return _error->Error("Malformed 2nd word in the Status line");
 
@@ -373,7 +406,7 @@ bool debListParser::ParseStatus(pkgCache::PkgIterator &Pkg,
                             {"triggers-pending",pkgCache::State::TriggersPending},
                             {"post-inst-failed",pkgCache::State::HalfConfigured},
                             {"removal-failed",pkgCache::State::HalfInstalled},
-                            {}};
+                            {NULL, 0}};
    if (GrabWord(string(Start,I-Start),StatusList,Pkg->CurrentState) == false)
       return _error->Error("Malformed 3rd word in the Status line");
 
@@ -450,39 +483,36 @@ const char *debListParser::ConvertRelation(const char *I,unsigned int &Op)
    }
    return I;
 }
-
-/*
- * CompleteArch:
- *
- * The complete architecture, consisting of <kernel>-<cpu>.
- */
-static string CompleteArch(std::string const &arch) {
-    if (arch == "armel")              return "linux-arm";
-    if (arch == "armhf")              return "linux-arm";
-    if (arch == "lpia")               return "linux-i386";
-    if (arch == "powerpcspe")         return "linux-powerpc";
-    if (arch == "uclibc-linux-armel") return "linux-arm";
-    if (arch == "uclinux-armel")      return "uclinux-arm";
-
-    return (arch.find("-") != string::npos) ? arch : "linux-" + arch;
-}
 									/*}}}*/
 // 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 &StripMultiArch,
+					bool const &ParseRestrictionsList)
 {
    // Strip off leading space
-   for (;Start != Stop && isspace(*Start) != 0; Start++);
+   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 != '[' && *I != ']'; I++);
+	*I != ',' && *I != '|' && *I != '[' && *I != ']' &&
+	*I != '<' && *I != '>'; ++I);
    
    // Malformed, no '('
    if (I != Stop && *I == ')')
@@ -520,9 +550,9 @@ const char *debListParser::ParseDepends(const char *Start,const char *Stop,
       // Skip whitespace
       for (;I != Stop && isspace(*I) != 0; I++);
       Start = I;
-      for (;I != Stop && *I != ')'; I++);
-      if (I == Stop || Start == I)
-	 return 0;     
+      I = (const char*) memchr(I, ')', Stop - I);
+      if (I == NULL || Start == I)
+	 return 0;
       
       // Skip trailing whitespace
       const char *End = I;
@@ -542,58 +572,129 @@ const char *debListParser::ParseDepends(const char *Start,const char *Stop,
 
    if (ParseArchFlags == true)
    {
-      string completeArch = CompleteArch(arch);
+      APT::CacheFilter::PackageArchitectureMatchesSpecification matchesArch(arch, false);
 
       // Parse an architecture
       if (I != Stop && *I == '[')
       {
+	 ++I;
 	 // malformed
-         I++;
-         if (I == Stop)
-	    return 0; 
-	 
-         const char *End = I;
-         bool Found = false;
-      	 bool NegArch = false;
-         while (I != Stop) 
+	 if (unlikely(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) 
+	    // look for whitespace or ending ']'
+	    for (;End != Stop && !isspace(*End) && *End != ']'; ++End);
+
+	    if (unlikely(End == Stop))
 	       return 0;
 
 	    if (*I == '!')
-            {
+	    {
 	       NegArch = true;
-	       I++;
-            }
+	       ++I;
+	    }
 
-	    if (stringcmp(arch,I,End) == 0) {
+	    std::string arch(I, End);
+	    if (arch.empty() == false && matchesArch(arch.c_str()) == true)
+	    {
 	       Found = true;
-	    } else {
-	       std::string wildcard = SubstVar(string(I, End), "any", "*");
-	       if (fnmatch(wildcard.c_str(), completeArch.c_str(), 0) == 0)
-	          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(*I) != 0; I++);
-         }
+	 }
 
-	 if (NegArch)
+	 if (NegArch == true)
 	    Found = !Found;
-	 
-         if (Found == false)
+
+	 if (Found == false)
 	    Package = ""; /* not for this arch */
       }
-      
+
+      // Skip whitespace
+      for (;I != Stop && isspace(*I) != 0; I++);
+   }
+
+   if (ParseRestrictionsList == true)
+   {
+      // Parse a restrictions list
+      if (I != Stop && *I == '<')
+      {
+	 ++I;
+	 // malformed
+	 if (unlikely(I == Stop))
+	    return 0;
+
+	 std::vector<string> const profiles = APT::Configuration::getBuildProfiles();
+
+	 const char *End = I;
+	 bool Found = false;
+	 bool NegRestriction = false;
+	 while (I != Stop)
+	 {
+	    // look for whitespace or ending '>'
+	    for (;End != Stop && !isspace(*End) && *End != '>'; ++End);
+
+	    if (unlikely(End == Stop))
+	       return 0;
+
+	    if (*I == '!')
+	    {
+	       NegRestriction = true;
+	       ++I;
+	    }
+
+	    std::string restriction(I, End);
+
+	    std::string prefix = "profile.";
+	    // only support for "profile" prefix, ignore others
+	    if (restriction.size() > prefix.size() &&
+		  restriction.substr(0, prefix.size()) == prefix)
+	    {
+	       // get the name of the profile
+	       restriction = restriction.substr(prefix.size());
+
+	       if (restriction.empty() == false && profiles.empty() == false &&
+		     std::find(profiles.begin(), profiles.end(), restriction) != profiles.end())
+	       {
+		  Found = true;
+		  if (I[-1] != '!')
+		     NegRestriction = 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(*I) != 0; I++);
+	 }
+
+	 if (NegRestriction == true)
+	    Found = !Found;
+
+	 if (Found == false)
+	    Package = ""; /* not for this restriction */
+      }
+
       // Skip whitespace
       for (;I != Stop && isspace(*I) != 0; I++);
    }
@@ -623,18 +724,21 @@ bool debListParser::ParseDepends(pkgCache::VerIterator &Ver,
    if (Section.Find(Tag,Start,Stop) == false)
       return true;
 
-   string Package;
    string const pkgArch = Ver.Arch();
-   string Version;
-   unsigned int Op;
 
    while (1)
    {
-      Start = ParseDepends(Start,Stop,Package,Version,Op,false,!MultiArchEnabled);
+      string Package;
+      string Version;
+      unsigned int Op;
+
+      Start = ParseDepends(Start, Stop, Package, Version, Op, false, false, false);
       if (Start == 0)
 	 return _error->Error("Problem parsing dependency %s",Tag);
+      size_t const found = Package.rfind(':');
 
-      if (MultiArchEnabled == true &&
+      // If negative is unspecific it needs to apply on all architectures
+      if (MultiArchEnabled == true && found == string::npos &&
 	  (Type == pkgCache::Dep::Conflicts ||
 	   Type == pkgCache::Dep::DpkgBreaks ||
 	   Type == pkgCache::Dep::Replaces))
@@ -643,9 +747,33 @@ bool debListParser::ParseDepends(pkgCache::VerIterator &Ver,
 	      a != Architectures.end(); ++a)
 	    if (NewDepends(Ver,Package,*a,Version,Op,Type) == false)
 	       return false;
+	 if (NewDepends(Ver,Package,"none",Version,Op,Type) == false)
+	    return false;
+      }
+      else if (MultiArchEnabled == true && found != string::npos &&
+	       strcmp(Package.c_str() + found, ":any") != 0)
+      {
+	 string Arch = Package.substr(found+1, string::npos);
+	 Package = Package.substr(0, found);
+	 // Such dependencies are not supposed to be accepted …
+	 // … but this is probably the best thing to do.
+	 if (Arch == "native")
+	    Arch = _config->Find("APT::Architecture");
+	 if (NewDepends(Ver,Package,Arch,Version,Op,Type) == false)
+	    return false;
+      }
+      else
+      {
+	 if (NewDepends(Ver,Package,pkgArch,Version,Op,Type) == false)
+	    return false;
+	 if ((Type == pkgCache::Dep::Conflicts ||
+	      Type == pkgCache::Dep::DpkgBreaks ||
+	      Type == pkgCache::Dep::Replaces) &&
+	     NewDepends(Ver, Package,
+			(pkgArch != "none") ? "none" : _config->Find("APT::Architecture"),
+			Version,Op,Type) == false)
+	    return false;
       }
-      else if (NewDepends(Ver,Package,pkgArch,Version,Op,Type) == false)
-	 return false;
       if (Start == Stop)
 	 break;
    }
@@ -673,6 +801,9 @@ bool debListParser::ParseProvides(pkgCache::VerIterator &Ver)
 	    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 ((Ver->MultiArch & pkgCache::Version::Foreign) == pkgCache::Version::Foreign) {
+	    if (NewProvidesAllArch(Ver, Package, Version) == false)
+	       return false;
 	 } else {
 	    if (NewProvides(Ver, Package, Arch, Version) == false)
 	       return false;
@@ -683,9 +814,7 @@ bool debListParser::ParseProvides(pkgCache::VerIterator &Ver)
       }
    }
 
-   if (MultiArchEnabled == false)
-      return true;
-   else if ((Ver->MultiArch & pkgCache::Version::Allowed) == pkgCache::Version::Allowed)
+   if ((Ver->MultiArch & pkgCache::Version::Allowed) == pkgCache::Version::Allowed)
    {
       string const Package = string(Ver.ParentPkg().Name()).append(":").append("any");
       return NewProvidesAllArch(Ver, Package, Ver.VerStr());
@@ -726,7 +855,7 @@ bool debListParser::GrabWord(string Word,WordList *List,unsigned char &Out)
 									/*}}}*/
 // ListParser::Step - Move to the next section in the file		/*{{{*/
 // ---------------------------------------------------------------------
-/* This has to be carefull to only process the correct architecture */
+/* This has to be careful to only process the correct architecture */
 bool debListParser::Step()
 {
    iOffset = Tags.Offset();
@@ -736,13 +865,15 @@ bool debListParser::Step()
          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 || Arch == "any" || MultiArchEnabled == false)
       {
 	 if (APT::Configuration::checkArchitecture(Architecture) == true)
 	    return true;
+	 /* parse version stanzas without an architecture only in the status file
+	    (and as misfortune bycatch flat-archives) */
+	 if ((Arch.empty() == true || Arch == "any") && Architecture.empty() == true)
+	    return true;
       }
       else
       {
@@ -766,101 +897,31 @@ bool debListParser::LoadReleaseInfo(pkgCache::PkgFileIterator &FileI,
 {
    // 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);
+   map_ptrloc const storage = WriteUniqString(component);
+   FileI->Component = storage;
 
-   FILE* release = fdopen(dup(File.Fd()), "r");
-   if (release == NULL)
+   pkgTagFile TagFile(&File, File.Size());
+   pkgTagSection Section;
+   if (_error->PendingError() == true || TagFile.Step(Section) == false)
       return false;
 
-   char buffer[101];
-   bool gpgClose = false;
-   while (fgets(buffer, sizeof(buffer), release) != NULL)
-   {
-      size_t len = 0;
-
-      // Skip empty lines
-      for (; buffer[len] == '\r' && buffer[len] == '\n'; ++len)
-         /* nothing */
-         ;
-      if (buffer[len] == '\0')
-	 continue;
-
-      // only evalute the first GPG section
-      if (strncmp("-----", buffer, 5) == 0)
-      {
-	 if (gpgClose == true)
-	    break;
-	 gpgClose = true;
-	 continue;
-      }
-
-      // seperate the tag from the data
-      for (; buffer[len] != ':' && buffer[len] != '\0'; ++len)
-         /* nothing */
-         ;
-      if (buffer[len] == '\0')
-	 continue;
-      char* dataStart = buffer + len;
-      for (++dataStart; *dataStart == ' '; ++dataStart)
-         /* nothing */
-         ;
-      char* dataEnd = dataStart;
-      for (++dataEnd; *dataEnd != '\0'; ++dataEnd)
-         /* nothing */
-         ;
-      // The last char should be a newline, but we can never be sure: #633350
-      char* lineEnd = dataEnd;
-      for (--lineEnd; *lineEnd == '\r' || *lineEnd == '\n'; --lineEnd)
-         /* nothing */
-         ;
-      ++lineEnd;
-
-      // which datastorage need to be updated
-      map_ptrloc* writeTo = NULL;
-      if (buffer[0] == ' ')
-	 ;
-      #define APT_PARSER_WRITETO(X, Y) else if (strncmp(Y, buffer, len) == 0) writeTo = &X;
-      APT_PARSER_WRITETO(FileI->Archive, "Suite")
-      APT_PARSER_WRITETO(FileI->Component, "Component")
-      APT_PARSER_WRITETO(FileI->Version, "Version")
-      APT_PARSER_WRITETO(FileI->Origin, "Origin")
-      APT_PARSER_WRITETO(FileI->Codename, "Codename")
-      APT_PARSER_WRITETO(FileI->Label, "Label")
-      #undef APT_PARSER_WRITETO
-      #define APT_PARSER_FLAGIT(X) else if (strncmp(#X, buffer, len) == 0) \
-	 pkgTagSection::FindFlag(FileI->Flags, pkgCache::Flag:: X, dataStart, lineEnd);
-      APT_PARSER_FLAGIT(NotAutomatic)
-      APT_PARSER_FLAGIT(ButAutomaticUpgrades)
-      #undef APT_PARSER_FLAGIT
-
-      // load all data from the line and save it
-      string data;
-      if (writeTo != NULL)
-	 data.append(dataStart, dataEnd);
-      if (sizeof(buffer) - 1 == (dataEnd - buffer))
-      {
-	 while (fgets(buffer, sizeof(buffer), release) != NULL)
-	 {
-	    if (writeTo != NULL)
-	       data.append(buffer);
-	    if (strlen(buffer) != sizeof(buffer) - 1)
-	       break;
-	 }
-      }
-      if (writeTo != NULL)
-      {
-	 // remove spaces and stuff from the end of the data line
-	 for (std::string::reverse_iterator s = data.rbegin();
-	      s != data.rend(); ++s)
-	 {
-	    if (*s != '\r' && *s != '\n' && *s != ' ')
-	       break;
-	    *s = '\0';
-	 }
-	 *writeTo = WriteUniqString(data);
-      }
+   std::string data;
+   #define APT_INRELEASE(TAG, STORE) \
+   data = Section.FindS(TAG); \
+   if (data.empty() == false) \
+   { \
+      map_ptrloc const storage = WriteUniqString(data); \
+      STORE = storage; \
    }
-   fclose(release);
+   APT_INRELEASE("Suite", FileI->Archive)
+   APT_INRELEASE("Component", FileI->Component)
+   APT_INRELEASE("Version", FileI->Version)
+   APT_INRELEASE("Origin", FileI->Origin)
+   APT_INRELEASE("Codename", FileI->Codename)
+   APT_INRELEASE("Label", FileI->Label)
+   #undef APT_INRELEASE
+   Section.FindFlag("NotAutomatic", FileI->Flags, pkgCache::Flag::NotAutomatic);
+   Section.FindFlag("ButAutomaticUpgrades", FileI->Flags, pkgCache::Flag::ButAutomaticUpgrades);
 
    return !_error->PendingError();
 }
@@ -877,3 +938,24 @@ unsigned char debListParser::GetPrio(string Str)
    return Out;
 }
 									/*}}}*/
+#if (APT_PKG_MAJOR >= 4 && APT_PKG_MINOR >= 13)
+bool debListParser::SameVersion(unsigned short const Hash,		/*{{{*/
+      pkgCache::VerIterator const &Ver)
+{
+   if (pkgCacheGenerator::ListParser::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("Size");
+   if (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;
+}
+									/*}}}*/
+#endif