guard pkg/grp hashtable creation changes

The change itself is no problem ABI wise, but the remove of the old
undynamic hashtables is, so we bring it back for older abis and happily
use the now available free space to backport more recent additions like
the dynamic hashtable itself.

Git-Dch: Ignore

1 files changed, 8 insertions, 5 deletions

diff --git a/cmdline/apt-cache.cc b/cmdline/apt-cache.cc
index 1bd75dfba..9bac45029 100644
--- a/cmdline/apt-cache.cc
+++ b/cmdline/apt-cache.cc
@@ -267,11 +267,14 @@ static bool DumpPackage(CommandLine &CmdL)
 // ShowHashTableStats - Show stats about a hashtable			/*{{{*/
 // ---------------------------------------------------------------------
 /* */
+static map_pointer_t PackageNext(pkgCache::Package const * const P) { return P->NextPackage; }
+static map_pointer_t GroupNext(pkgCache::Group const * const G) { return G->Next; }
 template<class T>
 static void ShowHashTableStats(std::string Type,
                                T *StartP,
                                map_pointer_t *Hashtable,
-                               unsigned long Size)
+                               unsigned long Size,
+			       map_pointer_t(*Next)(T const * const))
 {
    // hashtable stats for the HashTable
    unsigned long NumBuckets = Size;
@@ -290,7 +293,7 @@ static void ShowHashTableStats(std::string Type,
       }
       ++UsedBuckets;
       unsigned long ThisBucketSize = 0;
-      for (; P != StartP; P = StartP + P->Next)
+      for (; P != StartP; P = StartP + Next(P))
          ++ThisBucketSize;
       Entries += ThisBucketSize;
       LongestBucket = std::max(ThisBucketSize, LongestBucket);
@@ -447,13 +450,13 @@ static bool Stats(CommandLine &)
       APT_CACHESIZE(VerFileCount, VerFileSz) +
       APT_CACHESIZE(DescFileCount, DescFileSz) +
       APT_CACHESIZE(ProvidesCount, ProvidesSz) +
-      (2 * Cache->Head().HashTableSize * sizeof(map_id_t));
+      (2 * Cache->Head().GetHashTableSize() * sizeof(map_id_t));
    cout << _("Total space accounted for: ") << SizeToStr(Total) << endl;
 #undef APT_CACHESIZE
 
    // hashtable stats
-   ShowHashTableStats<pkgCache::Package>("PkgHashTable", Cache->PkgP, Cache->Head().PkgHashTable(), Cache->Head().HashTableSize);
-   ShowHashTableStats<pkgCache::Group>("GrpHashTable", Cache->GrpP, Cache->Head().GrpHashTable(), Cache->Head().HashTableSize);
+   ShowHashTableStats<pkgCache::Package>("PkgHashTable", Cache->PkgP, Cache->Head().PkgHashTableP(), Cache->Head().GetHashTableSize(), PackageNext);
+   ShowHashTableStats<pkgCache::Group>("GrpHashTable", Cache->GrpP, Cache->Head().GrpHashTableP(), Cache->Head().GetHashTableSize(), GroupNext);
 
    return true;
 }