apt-pkg/pkgcache.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: pkgcache.h,v 1.7 1998/07/19 04:22:01 jgg Exp $
   4 /* ######################################################################
   5
   6    Cache - Structure definitions for the cache file
   7
   8    Please see doc/apt-pkg/cache.sgml for a more detailed description of
   9    this format. Also be sure to keep that file up-to-date!!
  10
  11    Clients should always use the CacheIterators classes for access to the
  12    cache. They provide a simple STL-like method for traversing the links
  13    of the datastructure.
  14
  15    See pkgcachegen.h for information about generating cache structures.
  16
  17    ##################################################################### */
  18                                                                         /*}}}*/
  19 // Header section: pkglib
  20 #ifndef PKGLIB_PKGCACHE_H
  21 #define PKGLIB_PKGCACHE_H
  22
  23 #ifdef __GNUG__
  24 #pragma interface "apt-pkg/pkgcache.h"
  25 #endif
  26
  27 #include <string>
  28 #include <time.h>
  29 #include <apt-pkg/mmap.h>
  30
  31 class pkgCache
  32 {
  33    public:
  34    // Cache element predeclarations
  35    struct Header;
  36    struct Package;
  37    struct PackageFile;
  38    struct Version;
  39    struct Provides;
  40    struct Dependency;
  41    struct StringItem;
  42    struct VerFile;
  43
  44    // Iterators
  45    class PkgIterator;
  46    class VerIterator;
  47    class DepIterator;
  48    class PrvIterator;
  49    class PkgFileIterator;
  50    class VerFileIterator;
  51    friend PkgIterator;
  52    friend VerIterator;
  53    friend DepIterator;
  54    friend PrvIterator;
  55    friend PkgFileIterator;
  56    friend VerFileIterator;
  57
  58    // These are all the constants used in the cache structures
  59    struct Dep
  60    {
  61       enum DepType {Depends=1,PreDepends=2,Suggests=3,Recommends=4,
  62          Conflicts=5,Replaces=6};
  63       enum DepCompareOp {Or=0x10,NoOp=0,LessEq=0x1,GreaterEq=0x2,Less=0x3,
  64          Greater=0x4,Equals=0x5,NotEquals=0x6};
  65    };
  66
  67    struct State
  68    {
  69       enum VerPriority {Important=1,Required=2,Standard=3,Optional=5,Extra=5};
  70       enum PkgSelectedState {Unknown=0,Install=1,Hold=2,DeInstall=3,Purge=4};
  71       enum PkgInstState {Ok=0,ReInstReq=1,HoldInst=2,HoldReInstReq=3};
  72       enum PkgCurrentState {NotInstalled=0,UnPacked=1,HalfConfigured=2,
  73          UnInstalled=3,HalfInstalled=4,ConfigFiles=5,Installed=6};
  74    };
  75
  76    struct Flag
  77    {
  78       enum PkgFlags {Auto=(1<<0),New=(1<<1),Obsolete=(1<<2),Essential=(1<<3),
  79          ImmediateConf=(1<<4)};
  80       enum PkgFFlags {NotSource=(1<<0)};
  81    };
  82
  83    protected:
  84
  85    // Memory mapped cache file
  86    string CacheFile;
  87    MMap &Map;
  88
  89    bool Public;
  90    bool ReadOnly;
  91
  92    static unsigned long sHash(string S);
  93    static unsigned long sHash(const char *S);
  94
  95    public:
  96
  97    // Pointers to the arrays of items
  98    Header *HeaderP;
  99    Package *PkgP;
 100    VerFile *VerFileP;
 101    PackageFile *PkgFileP;
 102    Version *VerP;
 103    Provides *ProvideP;
 104    Dependency *DepP;
 105    StringItem *StringItemP;
 106    char *StrP;
 107
 108    virtual bool ReMap();
 109    inline bool Sync() {return Map.Sync();};
 110
 111    // String hashing function (512 range)
 112    inline unsigned long Hash(string S) const {return sHash(S);};
 113    inline unsigned long Hash(const char *S) const {return sHash(S);};
 114
 115    // Usefull transformation things
 116    const char *Priority(unsigned char Priority);
 117
 118    // Accessors
 119    PkgIterator FindPkg(string Name);
 120    Header &Head() {return *HeaderP;};
 121    inline PkgIterator PkgBegin();
 122    inline PkgIterator PkgEnd();
 123    inline PkgFileIterator FileBegin();
 124    inline PkgFileIterator FileEnd();
 125
 126    pkgCache(MMap &Map);
 127    virtual ~pkgCache() {};
 128 };
 129
 130 // Header structure
 131 struct pkgCache::Header
 132 {
 133    // Signature information
 134    unsigned long Signature;
 135    short MajorVersion;
 136    short MinorVersion;
 137    bool Dirty;
 138
 139    // Size of structure values
 140    unsigned short HeaderSz;
 141    unsigned short PackageSz;
 142    unsigned short PackageFileSz;
 143    unsigned short VersionSz;
 144    unsigned short DependencySz;
 145    unsigned short ProvidesSz;
 146    unsigned short VerFileSz;
 147
 148    // Structure counts
 149    unsigned long PackageCount;
 150    unsigned long VersionCount;
 151    unsigned long DependsCount;
 152    unsigned long PackageFileCount;
 153
 154    // Offsets
 155    unsigned long FileList;              // struct PackageFile
 156    unsigned long StringList;            // struct StringItem
 157    unsigned long MaxVerFileSize;
 158
 159    /* Allocation pools, there should be one of these for each structure
 160       excluding the header */
 161    DynamicMMap::Pool Pools[7];
 162
 163    // Rapid package name lookup
 164    unsigned long HashTable[512];
 165
 166    bool CheckSizes(Header &Against) const;
 167    Header();
 168 };
 169
 170 struct pkgCache::Package
 171 {
 172    // Pointers
 173    unsigned long Name;              // Stringtable
 174    unsigned long VersionList;       // Version
 175    unsigned long TargetVer;         // Version
 176    unsigned long CurrentVer;        // Version
 177    unsigned long TargetDist;        // StringTable (StringItem)
 178    unsigned long Section;           // StringTable (StringItem)
 179
 180    // Linked list
 181    unsigned long NextPackage;       // Package
 182    unsigned long RevDepends;        // Dependency
 183    unsigned long ProvidesList;      // Provides
 184
 185    // Install/Remove/Purge etc
 186    unsigned char SelectedState;     // What
 187    unsigned char InstState;         // Flags
 188    unsigned char CurrentState;      // State
 189
 190    unsigned short ID;
 191    unsigned long Flags;
 192 };
 193
 194 struct pkgCache::PackageFile
 195 {
 196    // Names
 197    unsigned long FileName;        // Stringtable
 198    unsigned long Version;         // Stringtable
 199    unsigned long Distribution;    // Stringtable
 200    unsigned long Size;
 201
 202    // Linked list
 203    unsigned long NextFile;        // PackageFile
 204    unsigned short ID;
 205    unsigned long Flags;
 206    time_t mtime;                  // Modification time for the file
 207 };
 208
 209 struct pkgCache::VerFile
 210 {
 211    unsigned long File;           // PackageFile
 212    unsigned long NextFile;       // PkgVerFile
 213    unsigned long Offset;
 214    unsigned short Size;
 215 };
 216
 217 struct pkgCache::Version
 218 {
 219    unsigned long VerStr;            // Stringtable
 220    unsigned long Section;           // StringTable (StringItem)
 221
 222    // Lists
 223    unsigned long FileList;          // VerFile
 224    unsigned long NextVer;           // Version
 225    unsigned long DependsList;       // Dependency
 226    unsigned long ParentPkg;         // Package
 227    unsigned long ProvidesList;      // Provides
 228
 229    unsigned long Size;
 230    unsigned long InstalledSize;
 231    unsigned short ID;
 232    unsigned char Priority;
 233 };
 234
 235 struct pkgCache::Dependency
 236 {
 237    unsigned long Version;         // Stringtable
 238    unsigned long Package;         // Package
 239    unsigned long NextDepends;     // Dependency
 240    unsigned long NextRevDepends;  // Dependency
 241    unsigned long ParentVer;       // Version
 242
 243    // Specific types of depends
 244    unsigned char Type;
 245    unsigned char CompareOp;
 246    unsigned short ID;
 247 };
 248
 249 struct pkgCache::Provides
 250 {
 251    unsigned long ParentPkg;        // Pacakge
 252    unsigned long Version;          // Version
 253    unsigned long ProvideVersion;   // Stringtable
 254    unsigned long NextProvides;     // Provides
 255    unsigned long NextPkgProv;      // Provides
 256 };
 257
 258 struct pkgCache::StringItem
 259 {
 260    unsigned long String;        // Stringtable
 261    unsigned long NextItem;      // StringItem
 262 };
 263
 264 #include <apt-pkg/cacheiterators.h>
 265
 266 inline pkgCache::PkgIterator pkgCache::PkgBegin()
 267        {return PkgIterator(*this);};
 268 inline pkgCache::PkgIterator pkgCache::PkgEnd()
 269        {return PkgIterator(*this,PkgP);};
 270 inline pkgCache::PkgFileIterator pkgCache::FileBegin()
 271        {return PkgFileIterator(*this);};
 272 inline pkgCache::PkgFileIterator pkgCache::FileEnd()
 273        {return PkgFileIterator(*this,PkgFileP);};
 274
 275 #endif