support compression and by-hash for .diff/Index files

[apt.git] / apt-pkg / pkgcachegen.h

diff --git a/apt-pkg/pkgcachegen.h b/apt-pkg/pkgcachegen.h
index 9455f0b7ac5947a42eafe673d2e9ce604d6a39ba..228b9f71dab392eae854964bf8cd293230761e8f 100644 (file)
--- a/apt-pkg/pkgcachegen.h
+++ b/apt-pkg/pkgcachegen.h
@@ -27,7 +27,7 @@
 #include <vector>
 #include <string>
 #if __cplusplus >= 201103L
-#include <unordered_map>
+#include <unordered_set>
 #endif
 #ifdef APT_PKG_EXPOSE_STRING_VIEW
 #include <apt-pkg/string_view.h>
@@ -48,10 +48,34 @@ class APT_HIDDEN pkgCacheGenerator                                  /*{{{*/
 
    // Dirty hack for public users that do not use C++11 yet
 #if __cplusplus >= 201103L
-   std::unordered_map<std::string,map_stringitem_t> strMixed;
-   std::unordered_map<std::string,map_stringitem_t> strSections;
-   std::unordered_map<std::string,map_stringitem_t> strPkgNames;
-   std::unordered_map<std::string,map_stringitem_t> strVersions;
+   struct string_pointer {
+      const char *data_;
+      size_t size;
+      pkgCacheGenerator *generator;
+      map_stringitem_t item;
+
+      const char *data() const {
+        return data_ != nullptr ? data_ : static_cast<char*>(generator->Map.Data()) + item;
+      }
+
+      bool operator ==(string_pointer const &other) const {
+        return size == other.size && memcmp(data(), other.data(), size) == 0;
+      }
+   };
+   struct hash {
+      uint32_t operator()(string_pointer const &that) const {
+        uint32_t Hash = 5381;
+        const char * const end = that.data() + that.size;
+        for (const char *I = that.data(); I != end; ++I)
+           Hash = 33 * Hash + *I;
+        return Hash;
+      }
+   };
+
+   std::unordered_set<string_pointer, hash> strMixed;
+   std::unordered_set<string_pointer, hash> strPkgNames;
+   std::unordered_set<string_pointer, hash> strVersions;
+   std::unordered_set<string_pointer, hash> strSections;
 #endif
 
    friend class pkgCacheListParser;
@@ -69,6 +93,11 @@ class APT_HIDDEN pkgCacheGenerator                                   /*{{{*/
       ~Dynamic() {
         toReMap.pop_back();
       }
+
+#if __cplusplus >= 201103L
+      Dynamic(const Dynamic&) = delete;
+      void operator=(const Dynamic&) = delete;
+#endif
    };
 
    protected:
@@ -85,17 +114,15 @@ class APT_HIDDEN pkgCacheGenerator                                 /*{{{*/
 #ifdef APT_PKG_EXPOSE_STRING_VIEW
    bool NewGroup(pkgCache::GrpIterator &Grp, APT::StringView Name);
    bool NewPackage(pkgCache::PkgIterator &Pkg, APT::StringView Name, APT::StringView Arch);
+   map_pointer_t NewVersion(pkgCache::VerIterator &Ver, APT::StringView const &VerStr,
+                           map_pointer_t const ParentPkg, unsigned short const Hash,
+                           map_pointer_t const Next);
 #endif
    bool NewFileVer(pkgCache::VerIterator &Ver,ListParser &List);
    bool NewFileDesc(pkgCache::DescIterator &Desc,ListParser &List);
    bool NewDepends(pkgCache::PkgIterator &Pkg, pkgCache::VerIterator &Ver,
                   map_pointer_t const Version, uint8_t const Op,
                   uint8_t const Type, map_pointer_t* &OldDepLast);
-   map_pointer_t NewVersion(pkgCache::VerIterator &Ver,const std::string &VerStr,map_pointer_t const Next) APT_DEPRECATED
-   { return NewVersion(Ver, VerStr, 0, 0, Next); }
-   map_pointer_t NewVersion(pkgCache::VerIterator &Ver,const std::string &VerStr,
-                           map_pointer_t const ParentPkg, unsigned short const Hash,
-                           map_pointer_t const Next);
    map_pointer_t NewDescription(pkgCache::DescIterator &Desc,const std::string &Lang,const MD5SumValue &md5sum,map_stringitem_t const idxmd5str);
    bool NewProvides(pkgCache::VerIterator &Ver, pkgCache::PkgIterator &Pkg,
                    map_stringitem_t const ProvidesVersion, uint8_t const Flags);
@@ -104,7 +131,10 @@ class APT_HIDDEN pkgCacheGenerator                                 /*{{{*/
 
    enum StringType { MIXED, PKGNAME, VERSIONNUMBER, SECTION };
    map_stringitem_t StoreString(StringType const type, const char * S, unsigned int const Size);
-   inline map_stringitem_t StoreString(enum StringType const type, const std::string &S) {return StoreString(type, S.c_str(),S.length());};
+
+#ifdef APT_PKG_EXPOSE_STRING_VIEW
+   inline map_stringitem_t StoreString(enum StringType const type, APT::StringView S) {return StoreString(type, S.data(),S.length());};
+#endif
 
    void DropProgress() {Progress = 0;};
    bool SelectFile(const std::string &File,pkgIndexFile const &Index, std::string const &Architecture, std::string const &Component, unsigned long Flags = 0);
@@ -122,7 +152,8 @@ class APT_HIDDEN pkgCacheGenerator                                  /*{{{*/
                        MMap **OutMap,pkgCache **OutCache, bool AllowMem = false);
    APT_PUBLIC static bool MakeOnlyStatusCache(OpProgress *Progress,DynamicMMap **OutMap);
 
-   void ReMap(void const * const oldMap, void const * const newMap);
+   void ReMap(void const * const oldMap, void const * const newMap, size_t oldSize);
+   bool Start();
 
    pkgCacheGenerator(DynamicMMap *Map,OpProgress *Progress);
    virtual ~pkgCacheGenerator();
@@ -131,8 +162,10 @@ class APT_HIDDEN pkgCacheGenerator                                 /*{{{*/
    void * const d;
    APT_HIDDEN bool MergeListGroup(ListParser &List, std::string const &GrpName);
    APT_HIDDEN bool MergeListPackage(ListParser &List, pkgCache::PkgIterator &Pkg);
+#ifdef APT_PKG_EXPOSE_STRING_VIEW
    APT_HIDDEN bool MergeListVersion(ListParser &List, pkgCache::PkgIterator &Pkg,
-                        std::string const &Version, pkgCache::VerIterator* &OutVer);
+                        APT::StringView const &Version, pkgCache::VerIterator* &OutVer);
+#endif
 
    APT_HIDDEN bool AddImplicitDepends(pkgCache::GrpIterator &G, pkgCache::PkgIterator &P,
                           pkgCache::VerIterator &V);
@@ -156,8 +189,10 @@ class APT_HIDDEN pkgCacheListParser
 
    protected:
 
-   inline map_stringitem_t StoreString(pkgCacheGenerator::StringType const type, std::string const &S) {return Owner->StoreString(type, S);};
    inline map_stringitem_t StoreString(pkgCacheGenerator::StringType const type, const char *S,unsigned int Size) {return Owner->StoreString(type, S, Size);};
+#ifdef APT_PKG_EXPOSE_STRING_VIEW
+   inline map_stringitem_t StoreString(pkgCacheGenerator::StringType const type, APT::StringView S) {return Owner->StoreString(type, S);};
+#endif
 
    inline map_stringitem_t WriteString(const std::string &S) {return Owner->WriteStringInMap(S);};
    inline map_stringitem_t WriteString(const char *S,unsigned int Size) {return Owner->WriteStringInMap(S,Size);};
@@ -175,11 +210,12 @@ class APT_HIDDEN pkgCacheListParser
    
    // These all operate against the current section
    virtual std::string Package() = 0;
-   virtual std::string Architecture() = 0;
    virtual bool ArchitectureAll() = 0;
-   virtual std::string Version() = 0;
+#ifdef APT_PKG_EXPOSE_STRING_VIEW
+   virtual APT::StringView Architecture() = 0;
+   virtual APT::StringView Version() = 0;
+#endif
    virtual bool NewVersion(pkgCache::VerIterator &Ver) = 0;
-   virtual std::string Description(std::string const &lang) = 0;
    virtual std::vector<std::string> AvailableDescriptionLanguages() = 0;
    virtual MD5SumValue Description_md5() = 0;
    virtual unsigned short VersionHash() = 0;