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-rw-r--r--apt-pkg/pkgcachegen.cc184
1 files changed, 184 insertions, 0 deletions
diff --git a/apt-pkg/pkgcachegen.cc b/apt-pkg/pkgcachegen.cc
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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+// $Id: pkgcachegen.cc,v 1.1 1998/07/02 02:58:12 jgg Exp $
+/* ######################################################################
+
+ Package Cache Generator - Generator for the cache structure.
+
+ This builds the cache structure from the abstract package list parser.
+
+ ##################################################################### */
+ /*}}}*/
+// Include Files /*{{{*/
+#include <pkglib/pkgcachegen.h>
+#include <pkglib/error.h>
+#include <pkglib/version.h>
+
+#include <sys/stat.h>
+#include <unistd.h>
+ /*}}}*/
+
+// CacheGenerator::pkgCacheGenerator - Constructor /*{{{*/
+// ---------------------------------------------------------------------
+/* We set the diry flag and make sure that is written to the disk */
+pkgCacheGenerator::pkgCacheGenerator(DynamicMMap &Map) : Map(Map), Cache(Map)
+{
+ if (_error->PendingError() == true)
+ return;
+
+ if (Map.Size() == 0)
+ {
+ Map.RawAllocate(sizeof(pkgCache::Header));
+ *Cache.HeaderP = pkgCache::Header();
+ }
+ Cache.HeaderP->Dirty = true;
+ Map.Sync(0,sizeof(pkgCache::Header));
+ Map.UsePools(*Cache.HeaderP->Pools,sizeof(Cache.HeaderP->Pools)/sizeof(Cache.HeaderP->Pools[0]));
+}
+ /*}}}*/
+// CacheGenerator::~pkgCacheGenerator - Destructor /*{{{*/
+// ---------------------------------------------------------------------
+/* We sync the data then unset the dirty flag in two steps so as to
+ advoid a problem during a crash */
+pkgCacheGenerator::~pkgCacheGenerator()
+{
+ if (_error->PendingError() == true)
+ return;
+ if (Map.Sync() == false)
+ return;
+
+ Cache.HeaderP->Dirty = false;
+ Map.Sync(0,sizeof(pkgCache::Header));
+}
+ /*}}}*/
+// CacheGenerator::MergeList - Merge the package list /*{{{*/
+// ---------------------------------------------------------------------
+/* This provides the generation of the entries in the cache. Each loop
+ goes through a single package record from the underlying parse engine. */
+bool pkgCacheGenerator::MergeList(ListParser &List)
+{
+ List.Owner = this;
+
+ do
+ {
+ // Get a pointer to the package structure
+ string Package = List.Package();
+ pkgCache::PkgIterator Pkg = Cache.FindPkg(Package);
+ if (Pkg.end() == false)
+ {
+ if (NewPackage(Pkg,Package) == false)
+ return false;
+
+ if (List.NewPackage(Pkg) == false)
+ return false;
+ }
+ if (List.UsePackage(Pkg) == false)
+ return false;
+
+ /* Get a pointer to the version structure. We know the list is sorted
+ so we use that fact in the search. Insertion of new versions is
+ done with correct sorting */
+ string Version = List.Version();
+ pkgCache::VerIterator Ver = Pkg.VersionList();
+ unsigned long *Last = &Pkg->VersionList;
+ int Res;
+ for (; Ver.end() == false; Ver++, Last = &Ver->NextVer)
+ {
+ Res = pkgVersionCompare(Version.begin(),Version.end(),Ver.VerStr(),
+ Ver.VerStr() + strlen(Ver.VerStr()));
+ if (Res >= 0)
+ break;
+ }
+
+ /* We already have a version for this item, record that we
+ saw it */
+ if (Res == 0)
+ {
+ if (NewFileVer(Ver,List) == false)
+ return false;
+
+ continue;
+ }
+
+ // Add a new version
+ *Last = NewVersion(Ver,*Last);
+ if (List.NewVersion(Ver) == false)
+ return false;
+
+ if (NewFileVer(Ver,List) == false)
+ return false;
+ }
+ while (List.Step() == true);
+
+ return true;
+}
+ /*}}}*/
+// CacheGenerator::NewPackage - Add a new package /*{{{*/
+// ---------------------------------------------------------------------
+/* This creates a new package structure and adds it to the hash table */
+bool pkgCacheGenerator::NewPackage(pkgCache::PkgIterator Pkg,string Name)
+{
+ // Get a structure
+ unsigned long Package = Map.Allocate(sizeof(pkgCache::Package));
+ if (Package == 0)
+ return false;
+
+ Pkg = pkgCache::PkgIterator(Cache,Cache.PackageP + Package);
+
+ // Insert it into the hash table
+ unsigned long Hash = Map.Hash(Name);
+ Pkg->NextPackage = Cache.HeaderP->HashTable[Hash];
+ Cache.HeaderP->HashTable[Hash] = Package;
+
+ // Set the name and the ID
+ Pkg->Name = Map.WriteString(Name);
+ if (Pkg->Name == 0)
+ return false;
+ Pkg->ID = Cache.HeaderP->PackageCount++;
+
+ return true;
+}
+ /*}}}*/
+// CacheGenerator::NewFileVer - Create a new File<->Version association /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgCacheGenerator::NewFileVer(pkgCache::VerIterator Ver,
+ ListParser &List)
+{
+}
+ /*}}}*/
+// CacheGenerator::NewVersion - Create a new Version /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+unsigned long pkgCacheGenerator::NewVersion(pkgCache::VerIterator &Ver,
+ unsigned long Next)
+{
+}
+ /*}}}*/
+// CacheGenerator::SelectFile - Select the current file being parsed /*{{{*/
+// ---------------------------------------------------------------------
+/* This is used to select which file is to be associated with all newly
+ added versions. */
+bool pkgCacheGenerator::SelectFile(string File,unsigned long Flags)
+{
+ struct stat Buf;
+ if (stat(File.c_str(),&Buf) == -1)
+ return _error->Errno("stat","Couldn't stat ",File.c_str());
+
+ // Get some space for the structure
+ CurrentFile = Cache.PkgFileP + Map.Allocate(sizeof(*CurrentFile));
+ if (CurrentFile == Cache.PkgFileP)
+ return false;
+
+ // Fill it in
+ CurrentFile->FileName = Map.WriteString(File);
+ CurrentFile->Size = Buf.st_size;
+ CurrentFile->mtime = Buf.st_mtime;
+ CurrentFile->NextFile = Cache.HeaderP->FileList;
+ CurrentFile->Flags = Flags;
+ PkgFileName = File;
+
+ if (CurrentFile->FileName == 0)
+ return false;
+}
+ /*}}}*/