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+// -*- mode: cpp; mode: fold -*-
+// Description /*{{{*/
+/* ######################################################################
+
+ File Listing - Manages a Cache of File -> Package names.
+
+ This is identical to the Package cache, except that the generator
+ (which is much simpler) is integrated directly into the main class,
+ and it has been designed to handle live updates.
+
+ The storage content of the class is maintained in a memory map and is
+ written directly to the file system. Performance is traded against
+ space to give something that performs well and remains small.
+ The average per file usage is 32 bytes which yields about a meg every
+ 36k files. Directory paths are collected into a binary tree and stored
+ only once, this offsets the cost of the hash nodes enough to keep
+ memory usage slightly less than the sum of the filenames.
+
+ The file names are stored into a fixed size chained hash table that is
+ linked to the package name and to the directory component.
+
+ Each file node has a set of associated flags that indicate the current
+ state of the file.
+
+ ##################################################################### */
+ /*}}}*/
+#ifndef PKGLIB_FILELIST_H
+#define PKGLIB_FILELIST_H
+
+#include <apt-pkg/mmap.h>
+
+#include <cstring>
+#include <string>
+
+class pkgFLCache
+{
+ public:
+ struct Header;
+ struct Node;
+ struct Directory;
+ struct Package;
+ struct Diversion;
+ struct ConfFile;
+
+ class NodeIterator;
+ class DirIterator;
+ class PkgIterator;
+ class DiverIterator;
+
+ protected:
+ std::string CacheFile;
+ DynamicMMap &Map;
+ map_ptrloc LastTreeLookup;
+ unsigned long LastLookupSize;
+
+ // Helpers for the addition algorithms
+ map_ptrloc TreeLookup(map_ptrloc *Base,const char *Text,const char *TextEnd,
+ unsigned long Size,unsigned int *Count = 0,
+ bool Insert = false);
+
+ public:
+
+ // Pointers to the arrays of items
+ Header *HeaderP;
+ Node *NodeP;
+ Directory *DirP;
+ Package *PkgP;
+ Diversion *DiverP;
+ ConfFile *ConfP;
+ char *StrP;
+ unsigned char *AnyP;
+
+ // Quick accessors
+ Node *FileHash;
+
+ // Accessors
+ Header &Head() {return *HeaderP;};
+ void PrintTree(map_ptrloc Base,unsigned long Size);
+
+ // Add/Find things
+ PkgIterator GetPkg(const char *Name,const char *End,bool Insert);
+ inline PkgIterator GetPkg(const char *Name,bool Insert);
+ NodeIterator GetNode(const char *Name,
+ const char *NameEnd,
+ map_ptrloc Loc,
+ bool Insert,bool Divert);
+ Node *HashNode(NodeIterator const &N);
+ void DropNode(map_ptrloc Node);
+
+ inline DiverIterator DiverBegin();
+
+ // Diversion control
+ void BeginDiverLoad();
+ void FinishDiverLoad();
+ bool AddDiversion(PkgIterator const &Owner,const char *From,
+ const char *To);
+ bool AddConfFile(const char *Name,const char *NameEnd,
+ PkgIterator const &Owner,const unsigned char *Sum);
+
+ pkgFLCache(DynamicMMap &Map);
+// ~pkgFLCache();
+};
+
+struct pkgFLCache::Header
+{
+ // Signature information
+ unsigned long Signature;
+ short MajorVersion;
+ short MinorVersion;
+ bool Dirty;
+
+ // Size of structure values
+ unsigned HeaderSz;
+ unsigned NodeSz;
+ unsigned DirSz;
+ unsigned PackageSz;
+ unsigned DiversionSz;
+ unsigned ConfFileSz;
+
+ // Structure Counts;
+ unsigned int NodeCount;
+ unsigned int DirCount;
+ unsigned int PackageCount;
+ unsigned int DiversionCount;
+ unsigned int ConfFileCount;
+ unsigned int HashSize;
+ unsigned long UniqNodes;
+
+ // Offsets
+ map_ptrloc FileHash;
+ map_ptrloc DirTree;
+ map_ptrloc Packages;
+ map_ptrloc Diversions;
+
+ /* Allocation pools, there should be one of these for each structure
+ excluding the header */
+ DynamicMMap::Pool Pools[5];
+
+ bool CheckSizes(Header &Against) const;
+ Header();
+};
+
+/* The bit field is used to advoid incurring an extra 4 bytes x 40000,
+ Pointer is the most infrequently used member of the structure */
+struct pkgFLCache::Node
+{
+ map_ptrloc Dir; // Dir
+ map_ptrloc File; // String
+ unsigned Pointer:24; // Package/Diversion/ConfFile
+ unsigned Flags:8; // Package
+ map_ptrloc Next; // Node
+ map_ptrloc NextPkg; // Node
+
+ enum Flags {Diversion = (1<<0),ConfFile = (1<<1),
+ NewConfFile = (1<<2),NewFile = (1<<3),
+ Unpacked = (1<<4),Replaced = (1<<5)};
+};
+
+struct pkgFLCache::Directory
+{
+ map_ptrloc Left; // Directory
+ map_ptrloc Right; // Directory
+ map_ptrloc Name; // String
+};
+
+struct pkgFLCache::Package
+{
+ map_ptrloc Left; // Package
+ map_ptrloc Right; // Package
+ map_ptrloc Name; // String
+ map_ptrloc Files; // Node
+};
+
+struct pkgFLCache::Diversion
+{
+ map_ptrloc OwnerPkg; // Package
+ map_ptrloc DivertFrom; // Node
+ map_ptrloc DivertTo; // String
+
+ map_ptrloc Next; // Diversion
+ unsigned long Flags;
+
+ enum Flags {Touched = (1<<0)};
+};
+
+struct pkgFLCache::ConfFile
+{
+ map_ptrloc OwnerPkg; // Package
+ unsigned char MD5[16];
+};
+
+class pkgFLCache::PkgIterator
+{
+ Package *Pkg;
+ pkgFLCache *Owner;
+
+ public:
+
+ inline bool end() const {return Owner == 0 || Pkg == Owner->PkgP?true:false;}
+
+ // Accessors
+ inline Package *operator ->() {return Pkg;}
+ inline Package const *operator ->() const {return Pkg;}
+ inline Package const &operator *() const {return *Pkg;}
+ inline operator Package *() {return Pkg == Owner->PkgP?0:Pkg;}
+ inline operator Package const *() const {return Pkg == Owner->PkgP?0:Pkg;}
+
+ inline unsigned long Offset() const {return Pkg - Owner->PkgP;}
+ inline const char *Name() const {return Pkg->Name == 0?0:Owner->StrP + Pkg->Name;}
+ inline pkgFLCache::NodeIterator Files() const;
+
+ PkgIterator() : Pkg(0), Owner(0) {}
+ PkgIterator(pkgFLCache &Owner,Package *Trg) : Pkg(Trg), Owner(&Owner) {}
+};
+
+class pkgFLCache::DirIterator
+{
+ Directory *Dir;
+ pkgFLCache *Owner;
+
+ public:
+
+ // Accessors
+ inline Directory *operator ->() {return Dir;}
+ inline Directory const *operator ->() const {return Dir;}
+ inline Directory const &operator *() const {return *Dir;}
+ inline operator Directory *() {return Dir == Owner->DirP?0:Dir;}
+ inline operator Directory const *() const {return Dir == Owner->DirP?0:Dir;}
+
+ inline const char *Name() const {return Dir->Name == 0?0:Owner->StrP + Dir->Name;}
+
+ DirIterator() : Dir(0), Owner(0) {}
+ DirIterator(pkgFLCache &Owner,Directory *Trg) : Dir(Trg), Owner(&Owner) {}
+};
+
+class pkgFLCache::DiverIterator
+{
+ Diversion *Diver;
+ pkgFLCache *Owner;
+
+ public:
+
+ // Iteration
+ void operator ++(int) {if (Diver != Owner->DiverP) Diver = Owner->DiverP + Diver->Next;}
+ inline void operator ++() {operator ++(0);}
+ inline bool end() const {return Owner == 0 || Diver == Owner->DiverP;}
+
+ // Accessors
+ inline Diversion *operator ->() {return Diver;}
+ inline Diversion const *operator ->() const {return Diver;}
+ inline Diversion const &operator *() const {return *Diver;}
+ inline operator Diversion *() {return Diver == Owner->DiverP?0:Diver;}
+ inline operator Diversion const *() const {return Diver == Owner->DiverP?0:Diver;}
+
+ inline PkgIterator OwnerPkg() const {return PkgIterator(*Owner,Owner->PkgP + Diver->OwnerPkg);}
+ inline NodeIterator DivertFrom() const;
+ inline NodeIterator DivertTo() const;
+
+ DiverIterator() : Diver(0), Owner(0) {};
+ DiverIterator(pkgFLCache &Owner,Diversion *Trg) : Diver(Trg), Owner(&Owner) {}
+};
+
+class pkgFLCache::NodeIterator
+{
+ Node *Nde;
+ enum {NdePkg, NdeHash} Type;
+ pkgFLCache *Owner;
+
+ public:
+
+ // Iteration
+ void operator ++(int) {if (Nde != Owner->NodeP) Nde = Owner->NodeP +
+ (Type == NdePkg?Nde->NextPkg:Nde->Next);}
+ inline void operator ++() {operator ++(0);}
+ inline bool end() const {return Owner == 0 || Nde == Owner->NodeP;}
+
+ // Accessors
+ inline Node *operator ->() {return Nde;}
+ inline Node const *operator ->() const {return Nde;}
+ inline Node const &operator *() const {return *Nde;}
+ inline operator Node *() {return Nde == Owner->NodeP?0:Nde;}
+ inline operator Node const *() const {return Nde == Owner->NodeP?0:Nde;}
+ inline unsigned long Offset() const {return Nde - Owner->NodeP;}
+ inline DirIterator Dir() const {return DirIterator(*Owner,Owner->DirP + Nde->Dir);}
+ inline DiverIterator Diversion() const {return DiverIterator(*Owner,Owner->DiverP + Nde->Pointer);}
+ inline const char *File() const {return Nde->File == 0?0:Owner->StrP + Nde->File;}
+ inline const char *DirN() const {return Owner->StrP + Owner->DirP[Nde->Dir].Name;}
+ Package *RealPackage() const;
+
+ NodeIterator() : Nde(0), Type(NdeHash), Owner(0) {};
+ NodeIterator(pkgFLCache &Owner) : Nde(Owner.NodeP), Type(NdeHash), Owner(&Owner) {}
+ NodeIterator(pkgFLCache &Owner,Node *Trg) : Nde(Trg), Type(NdeHash), Owner(&Owner) {}
+ NodeIterator(pkgFLCache &Owner,Node *Trg,Package *) : Nde(Trg), Type(NdePkg), Owner(&Owner) {}
+};
+
+/* Inlines with forward references that cannot be included directly in their
+ respsective classes */
+inline pkgFLCache::NodeIterator pkgFLCache::DiverIterator::DivertFrom() const
+ {return NodeIterator(*Owner,Owner->NodeP + Diver->DivertFrom);}
+inline pkgFLCache::NodeIterator pkgFLCache::DiverIterator::DivertTo() const
+ {return NodeIterator(*Owner,Owner->NodeP + Diver->DivertTo);}
+
+inline pkgFLCache::NodeIterator pkgFLCache::PkgIterator::Files() const
+ {return NodeIterator(*Owner,Owner->NodeP + Pkg->Files,Pkg);}
+
+inline pkgFLCache::DiverIterator pkgFLCache::DiverBegin()
+ {return DiverIterator(*this,DiverP + HeaderP->Diversions);}
+
+inline pkgFLCache::PkgIterator pkgFLCache::GetPkg(const char *Name,bool Insert)
+ {return GetPkg(Name,Name+strlen(Name),Insert);}
+
+#endif
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