apt-pkg/pkgcache.h

   1 // -*- mode: cpp; mode: fold -*-
   2 // Description                                                          /*{{{*/
   3 // $Id: pkgcache.h,v 1.24 2001/05/07 04:24:08 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 #ifndef PKGLIB_PKGCACHE_H
  20 #define PKGLIB_PKGCACHE_H
  21
  22 #ifdef __GNUG__
  23 #pragma interface "apt-pkg/pkgcache.h"
  24 #endif
  25
  26 #include <string>
  27 #include <time.h>
  28 #include <apt-pkg/mmap.h>
  29
  30 using std::string;
  31
  32 class pkgVersioningSystem;
  33 class pkgCache
  34 {
  35    public:
  36    // Cache element predeclarations
  37    struct Header;
  38    struct Package;
  39    struct PackageFile;
  40    struct Version;
  41    struct Provides;
  42    struct Dependency;
  43    struct StringItem;
  44    struct VerFile;
  45
  46    // Iterators
  47    class PkgIterator;
  48    class VerIterator;
  49    class DepIterator;
  50    class PrvIterator;
  51    class PkgFileIterator;
  52    class VerFileIterator;
  53    friend class PkgIterator;
  54    friend class VerIterator;
  55    friend class DepIterator;
  56    friend class PrvIterator;
  57    friend class PkgFileIterator;
  58    friend class VerFileIterator;
  59
  60    class Namespace;
  61
  62    // These are all the constants used in the cache structures
  63    struct Dep
  64    {
  65       enum DepType {Depends=1,PreDepends=2,Suggests=3,Recommends=4,
  66          Conflicts=5,Replaces=6,Obsoletes=7};
  67       enum DepCompareOp {Or=0x10,NoOp=0,LessEq=0x1,GreaterEq=0x2,Less=0x3,
  68          Greater=0x4,Equals=0x5,NotEquals=0x6};
  69    };
  70
  71    struct State
  72    {
  73       enum VerPriority {Important=1,Required=2,Standard=3,Optional=4,Extra=5};
  74       enum PkgSelectedState {Unknown=0,Install=1,Hold=2,DeInstall=3,Purge=4};
  75       enum PkgInstState {Ok=0,ReInstReq=1,HoldInst=2,HoldReInstReq=3};
  76       enum PkgCurrentState {NotInstalled=0,UnPacked=1,HalfConfigured=2,
  77            HalfInstalled=4,ConfigFiles=5,Installed=6};
  78    };
  79
  80    struct Flag
  81    {
  82       enum PkgFlags {Auto=(1<<0),Essential=(1<<3),Important=(1<<4)};
  83       enum PkgFFlags {NotSource=(1<<0),NotAutomatic=(1<<1)};
  84    };
  85
  86    protected:
  87
  88    // Memory mapped cache file
  89    string CacheFile;
  90    MMap &Map;
  91
  92    unsigned long sHash(string S) const;
  93    unsigned long sHash(const char *S) const;
  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    inline MMap &GetMap() {return Map;};
 111    inline void *DataEnd() {return ((unsigned char *)Map.Data()) + Map.Size();};
 112
 113    // String hashing function (512 range)
 114    inline unsigned long Hash(string S) const {return sHash(S);};
 115    inline unsigned long Hash(const char *S) const {return sHash(S);};
 116
 117    // Usefull transformation things
 118    const char *Priority(unsigned char Priority);
 119
 120    // Accessors
 121    PkgIterator FindPkg(string Name);
 122    Header &Head() {return *HeaderP;};
 123    inline PkgIterator PkgBegin();
 124    inline PkgIterator PkgEnd();
 125    inline PkgFileIterator FileBegin();
 126    inline PkgFileIterator FileEnd();
 127
 128    // Make me a function
 129    pkgVersioningSystem *VS;
 130
 131    // Converters
 132    static const char *CompTypeDeb(unsigned char Comp);
 133    static const char *CompType(unsigned char Comp);
 134    static const char *DepType(unsigned char Dep);
 135
 136    pkgCache(MMap *Map,bool DoMap = true);
 137    virtual ~pkgCache() {};
 138 };
 139
 140 // Header structure
 141 struct pkgCache::Header
 142 {
 143    // Signature information
 144    unsigned long Signature;
 145    short MajorVersion;
 146    short MinorVersion;
 147    bool Dirty;
 148
 149    // Size of structure values
 150    unsigned short HeaderSz;
 151    unsigned short PackageSz;
 152    unsigned short PackageFileSz;
 153    unsigned short VersionSz;
 154    unsigned short DependencySz;
 155    unsigned short ProvidesSz;
 156    unsigned short VerFileSz;
 157
 158    // Structure counts
 159    unsigned long PackageCount;
 160    unsigned long VersionCount;
 161    unsigned long DependsCount;
 162    unsigned long PackageFileCount;
 163    unsigned long VerFileCount;
 164    unsigned long ProvidesCount;
 165
 166    // Offsets
 167    map_ptrloc FileList;              // struct PackageFile
 168    map_ptrloc StringList;            // struct StringItem
 169    map_ptrloc VerSysName;            // StringTable
 170    map_ptrloc Architecture;          // StringTable
 171    unsigned long MaxVerFileSize;
 172
 173    /* Allocation pools, there should be one of these for each structure
 174       excluding the header */
 175    DynamicMMap::Pool Pools[7];
 176
 177    // Rapid package name lookup
 178    map_ptrloc HashTable[2*1048];
 179
 180    bool CheckSizes(Header &Against) const;
 181    Header();
 182 };
 183
 184 struct pkgCache::Package
 185 {
 186    // Pointers
 187    map_ptrloc Name;              // Stringtable
 188    map_ptrloc VersionList;       // Version
 189    map_ptrloc CurrentVer;        // Version
 190    map_ptrloc Section;           // StringTable (StringItem)
 191
 192    // Linked list
 193    map_ptrloc NextPackage;       // Package
 194    map_ptrloc RevDepends;        // Dependency
 195    map_ptrloc ProvidesList;      // Provides
 196
 197    // Install/Remove/Purge etc
 198    unsigned char SelectedState;     // What
 199    unsigned char InstState;         // Flags
 200    unsigned char CurrentState;      // State
 201
 202    unsigned short ID;
 203    unsigned long Flags;
 204 };
 205
 206 struct pkgCache::PackageFile
 207 {
 208    // Names
 209    map_ptrloc FileName;        // Stringtable
 210    map_ptrloc Archive;         // Stringtable
 211    map_ptrloc Component;       // Stringtable
 212    map_ptrloc Version;         // Stringtable
 213    map_ptrloc Origin;          // Stringtable
 214    map_ptrloc Label;           // Stringtable
 215    map_ptrloc Architecture;    // Stringtable
 216    map_ptrloc Site;            // Stringtable
 217    map_ptrloc IndexType;       // Stringtable
 218    unsigned long Size;
 219    unsigned long Flags;
 220
 221    // Linked list
 222    map_ptrloc NextFile;        // PackageFile
 223    unsigned short ID;
 224    time_t mtime;                  // Modification time for the file
 225 };
 226
 227 struct pkgCache::VerFile
 228 {
 229    map_ptrloc File;           // PackageFile
 230    map_ptrloc NextFile;       // PkgVerFile
 231    map_ptrloc Offset;         // File offset
 232    unsigned short Size;
 233 };
 234
 235 struct pkgCache::Version
 236 {
 237    map_ptrloc VerStr;            // Stringtable
 238    map_ptrloc Section;           // StringTable (StringItem)
 239    map_ptrloc Arch;              // StringTable
 240
 241    // Lists
 242    map_ptrloc FileList;          // VerFile
 243    map_ptrloc NextVer;           // Version
 244    map_ptrloc DependsList;       // Dependency
 245    map_ptrloc ParentPkg;         // Package
 246    map_ptrloc ProvidesList;      // Provides
 247
 248    map_ptrloc Size;              // These are the .deb size
 249    map_ptrloc InstalledSize;
 250    unsigned short Hash;
 251    unsigned short ID;
 252    unsigned char Priority;
 253 };
 254
 255 struct pkgCache::Dependency
 256 {
 257    map_ptrloc Version;         // Stringtable
 258    map_ptrloc Package;         // Package
 259    map_ptrloc NextDepends;     // Dependency
 260    map_ptrloc NextRevDepends;  // Dependency
 261    map_ptrloc ParentVer;       // Version
 262
 263    // Specific types of depends
 264    unsigned char Type;
 265    unsigned char CompareOp;
 266    unsigned short ID;
 267 };
 268
 269 struct pkgCache::Provides
 270 {
 271    map_ptrloc ParentPkg;        // Pacakge
 272    map_ptrloc Version;          // Version
 273    map_ptrloc ProvideVersion;   // Stringtable
 274    map_ptrloc NextProvides;     // Provides
 275    map_ptrloc NextPkgProv;      // Provides
 276 };
 277
 278 struct pkgCache::StringItem
 279 {
 280    map_ptrloc String;        // Stringtable
 281    map_ptrloc NextItem;      // StringItem
 282 };
 283
 284 #include <apt-pkg/cacheiterators.h>
 285
 286 inline pkgCache::PkgIterator pkgCache::PkgBegin()
 287        {return PkgIterator(*this);};
 288 inline pkgCache::PkgIterator pkgCache::PkgEnd()
 289        {return PkgIterator(*this,PkgP);};
 290 inline pkgCache::PkgFileIterator pkgCache::FileBegin()
 291        {return PkgFileIterator(*this,PkgFileP + HeaderP->FileList);};
 292 inline pkgCache::PkgFileIterator pkgCache::FileEnd()
 293        {return PkgFileIterator(*this,PkgFileP);};
 294
 295 // Oh I wish for Real Name Space Support
 296 class pkgCache::Namespace
 297 {
 298    public:
 299
 300    typedef pkgCache::PkgIterator PkgIterator;
 301    typedef pkgCache::VerIterator VerIterator;
 302    typedef pkgCache::DepIterator DepIterator;
 303    typedef pkgCache::PrvIterator PrvIterator;
 304    typedef pkgCache::PkgFileIterator PkgFileIterator;
 305    typedef pkgCache::VerFileIterator VerFileIterator;
 306    typedef pkgCache::Version Version;
 307    typedef pkgCache::Package Package;
 308    typedef pkgCache::Header Header;
 309    typedef pkgCache::Dep Dep;
 310    typedef pkgCache::Flag Flag;
 311 };
 312
 313 #endif