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Diffstat (limited to 'apt-pkg/pkgcache.h')
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diff --git a/apt-pkg/pkgcache.h b/apt-pkg/pkgcache.h new file mode 100644 index 000000000..91228f713 --- /dev/null +++ b/apt-pkg/pkgcache.h @@ -0,0 +1,825 @@ +// -*- mode: cpp; mode: fold -*- +// Description /*{{{*/ +/**\file pkgcache.h + \brief pkgCache - Structure definitions for the cache file + + The goal of the cache file is two fold: + Firstly to speed loading and processing of the package file array and + secondly to reduce memory consumption of the package file array. + + The implementation is aimed at an environment with many primary package + files, for instance someone that has a Package file for their CD-ROM, a + Package file for the latest version of the distribution on the CD-ROM and a + package file for the development version. Always present is the information + contained in the status file which might be considered a separate package + file. + + Please understand, this is designed as a <b>Cache file</b> it is not meant to be + used on any system other than the one it was created for. It is not meant to + be authoritative either, i.e. if a system crash or software failure occurs it + must be perfectly acceptable for the cache file to be in an inconsistent + state. Furthermore at any time the cache file may be erased without losing + any information. + + Also the structures and storage layout is optimized for use by the APT + and may not be suitable for all purposes. However it should be possible + to extend it with associate cache files that contain other information. + + To keep memory use down the cache file only contains often used fields and + fields that are inexpensive to store, the Package file has a full list of + fields. Also the client may assume that all items are perfectly valid and + need not perform checks against their correctness. Removal of information + from the cache is possible, but blanks will be left in the file, and + unused strings will also be present. The recommended implementation is to + simply rebuild the cache each time any of the data files change. It is + possible to add a new package file to the cache without any negative side + effects. + + <b>Note on Pointer access</b> + Clients should always use the CacheIterators classes for access to the + cache and the data in it. They also provide a simple STL-like method for + traversing the links of the datastructure. + + Every item in every structure is stored as the index to that structure. + What this means is that once the files is mmaped every data access has to + go through a fix up stage to get a real memory pointer. This is done + by taking the index, multiplying it by the type size and then adding + it to the start address of the memory block. This sounds complex, but + in C it is a single array dereference. Because all items are aligned to + their size and indexes are stored as multiples of the size of the structure + the format is immediately portable to all possible architectures - BUT the + generated files are -NOT-. + + This scheme allows code like this to be written: + <example> + void *Map = mmap(...); + Package *PkgList = (Package *)Map; + Header *Head = (Header *)Map; + char *Strings = (char *)Map; + cout << (Strings + PkgList[Head->HashTable[0]]->Name) << endl; + </example> + Notice the lack of casting or multiplication. The net result is to return + the name of the first package in the first hash bucket, without error + checks. + + The generator uses allocation pools to group similarly sized structures in + large blocks to eliminate any alignment overhead. The generator also + assures that no structures overlap and all indexes are unique. Although + at first glance it may seem like there is the potential for two structures + to exist at the same point the generator never allows this to happen. + (See the discussion of free space pools) + + See \ref pkgcachegen.h for more information about generating cache structures. */ + /*}}}*/ +#ifndef PKGLIB_PKGCACHE_H +#define PKGLIB_PKGCACHE_H + +#include <apt-pkg/mmap.h> +#include <apt-pkg/macros.h> + +#include <string> +#include <time.h> +#include <stdint.h> + +#ifdef APT_PKG_EXPOSE_STRING_VIEW +#include <apt-pkg/string_view.h> +#endif + +#ifndef APT_8_CLEANER_HEADERS +using std::string; +#endif + +// size of (potentially big) files like debs or the install size of them +typedef uint64_t map_filesize_t; +// storing file sizes of indexes, which are way below 4 GB for now +typedef uint32_t map_filesize_small_t; +// each package/group/dependency gets an id +typedef uint32_t map_id_t; +// some files get an id, too, but in far less absolute numbers +typedef uint16_t map_fileid_t; +// relative pointer from cache start +typedef uint32_t map_pointer_t; +// same as the previous, but documented to be to a string item +typedef map_pointer_t map_stringitem_t; +// we have only a small amount of flags for each item +typedef uint8_t map_flags_t; +typedef uint8_t map_number_t; + +class pkgVersioningSystem; +class pkgCache /*{{{*/ +{ + public: + // Cache element predeclarations + struct Header; + struct Group; + struct Package; + struct ReleaseFile; + struct PackageFile; + struct Version; + struct Description; + struct Provides; + struct Dependency; + struct DependencyData; + struct StringItem; + struct VerFile; + struct DescFile; + + // Iterators + template<typename Str, typename Itr> class Iterator; + class GrpIterator; + class PkgIterator; + class VerIterator; + class DescIterator; + class DepIterator; + class PrvIterator; + class RlsFileIterator; + class PkgFileIterator; + class VerFileIterator; + class DescFileIterator; + + class Namespace; + + // These are all the constants used in the cache structures + + // WARNING - if you change these lists you must also edit + // the stringification in pkgcache.cc and also consider whether + // the cache file will become incompatible. + struct Dep + { + enum DepType {Depends=1,PreDepends=2,Suggests=3,Recommends=4, + Conflicts=5,Replaces=6,Obsoletes=7,DpkgBreaks=8,Enhances=9}; + /** \brief available compare operators + + The lower 4 bits are used to indicate what operator is being specified and + the upper 4 bits are flags. OR indicates that the next package is + or'd with the current package. */ + enum DepCompareOp {NoOp=0,LessEq=0x1,GreaterEq=0x2,Less=0x3, + Greater=0x4,Equals=0x5,NotEquals=0x6, + Or=0x10, /*!< or'ed with the next dependency */ + MultiArchImplicit=0x20, /*!< generated internally, not spelled out in the index */ + ArchSpecific=0x40 /*!< was decorated with an explicit architecture in index */ + }; + }; + + struct State + { + /** \brief priority of a package version + + Zero is used for unparsable or absent Priority fields. */ + enum VerPriority {Required=1,Important=2,Standard=3,Optional=4,Extra=5}; + enum PkgSelectedState {Unknown=0,Install=1,Hold=2,DeInstall=3,Purge=4}; + enum PkgInstState {Ok=0,ReInstReq=1,HoldInst=2,HoldReInstReq=3}; + enum PkgCurrentState {NotInstalled=0,UnPacked=1,HalfConfigured=2, + HalfInstalled=4,ConfigFiles=5,Installed=6, + TriggersAwaited=7,TriggersPending=8}; + }; + + struct Flag + { + enum PkgFlags {Auto=(1<<0),Essential=(1<<3),Important=(1<<4)}; + enum PkgFFlags { + NotSource=(1<<0), /*!< packages can't be fetched from here, e.g. dpkg/status file */ + LocalSource=(1<<1), /*!< local sources can't and will not be verified by hashes */ + NoPackages=(1<<2), /*!< the file includes no package records itself, but additions like Translations */ + }; + enum ReleaseFileFlags { + NotAutomatic=(1<<0), /*!< archive has a default pin of 1 */ + ButAutomaticUpgrades=(1<<1), /*!< (together with the previous) archive has a default pin of 100 */ + }; + enum ProvidesFlags { + MultiArchImplicit=pkgCache::Dep::MultiArchImplicit, /*!< generated internally, not spelled out in the index */ + ArchSpecific=pkgCache::Dep::ArchSpecific /*!< was decorated with an explicit architecture in index */ + }; + }; + + protected: + + // Memory mapped cache file + std::string CacheFile; + MMap ⤅ +#ifdef APT_PKG_EXPOSE_STRING_VIEW + APT_HIDDEN map_id_t sHash(APT::StringView S) const APT_PURE; +#endif + map_id_t sHash(const std::string &S) const APT_PURE; + map_id_t sHash(const char *S) const APT_PURE; + + public: + + // Pointers to the arrays of items + Header *HeaderP; + Group *GrpP; + Package *PkgP; + VerFile *VerFileP; + DescFile *DescFileP; + ReleaseFile *RlsFileP; + PackageFile *PkgFileP; + Version *VerP; + Description *DescP; + Provides *ProvideP; + Dependency *DepP; + DependencyData *DepDataP; + APT_DEPRECATED_MSG("Not used anymore in cache generation and without a replacement") StringItem *StringItemP; + char *StrP; + + virtual bool ReMap(bool const &Errorchecks = true); + inline bool Sync() {return Map.Sync();} + inline MMap &GetMap() {return Map;} + inline void *DataEnd() {return ((unsigned char *)Map.Data()) + Map.Size();} + + // String hashing function (512 range) +#ifdef APT_PKG_EXPOSE_STRING_VIEW + APT_HIDDEN inline map_id_t Hash(APT::StringView S) const {return sHash(S);} +#endif + inline map_id_t Hash(const std::string &S) const {return sHash(S);} + inline map_id_t Hash(const char *S) const {return sHash(S);} + + APT_HIDDEN uint32_t CacheHash(); + + // Useful transformation things + static const char *Priority(unsigned char Priority); + + // Accessors +#ifdef APT_PKG_EXPOSE_STRING_VIEW + APT_HIDDEN GrpIterator FindGrp(APT::StringView Name); + APT_HIDDEN PkgIterator FindPkg(APT::StringView Name); + APT_HIDDEN PkgIterator FindPkg(APT::StringView Name, APT::StringView Arch); +#endif + +#ifdef APT_PKG_EXPOSE_STRING_VIEW + APT::StringView ViewString(map_stringitem_t idx) const + { + char *name = StrP + idx; + uint16_t len = *reinterpret_cast<const uint16_t*>(name - sizeof(uint16_t)); + return APT::StringView(name, len); + } +#endif + + + GrpIterator FindGrp(const std::string &Name); + PkgIterator FindPkg(const std::string &Name); + PkgIterator FindPkg(const std::string &Name, const std::string &Arch); + + Header &Head() {return *HeaderP;} + inline GrpIterator GrpBegin(); + inline GrpIterator GrpEnd(); + inline PkgIterator PkgBegin(); + inline PkgIterator PkgEnd(); + inline PkgFileIterator FileBegin(); + inline PkgFileIterator FileEnd(); + inline RlsFileIterator RlsFileBegin(); + inline RlsFileIterator RlsFileEnd(); + + inline bool MultiArchCache() const { return MultiArchEnabled; } + inline char const * NativeArch(); + + // Make me a function + pkgVersioningSystem *VS; + + // Converters + static const char *CompTypeDeb(unsigned char Comp) APT_CONST; + static const char *CompType(unsigned char Comp) APT_CONST; + static const char *DepType(unsigned char Dep); + + pkgCache(MMap *Map,bool DoMap = true); + virtual ~pkgCache(); + +private: + void * const d; + bool MultiArchEnabled; +}; + /*}}}*/ +// Header structure /*{{{*/ +struct pkgCache::Header +{ + /** \brief Signature information + + This must contain the hex value 0x98FE76DC which is designed to + verify that the system loading the image has the same byte order + and byte size as the system saving the image */ + uint32_t Signature; + /** These contain the version of the cache file */ + map_number_t MajorVersion; + map_number_t MinorVersion; + /** \brief indicates if the cache should be erased + + Dirty is true if the cache file was opened for reading, the client + expects to have written things to it and have not fully synced it. + The file should be erased and rebuilt if it is true. */ + bool Dirty; + + /** \brief Size of structure values + + All *Sz variables contains the sizeof() that particular structure. + It is used as an extra consistency check on the structure of the file. + + If any of the size values do not exactly match what the client expects + then the client should refuse the load the file. */ + uint16_t HeaderSz; + map_number_t GroupSz; + map_number_t PackageSz; + map_number_t ReleaseFileSz; + map_number_t PackageFileSz; + map_number_t VersionSz; + map_number_t DescriptionSz; + map_number_t DependencySz; + map_number_t DependencyDataSz; + map_number_t ProvidesSz; + map_number_t VerFileSz; + map_number_t DescFileSz; + + /** \brief Structure counts + + These indicate the number of each structure contained in the cache. + PackageCount is especially useful for generating user state structures. + See Package::Id for more info. */ + map_id_t GroupCount; + map_id_t PackageCount; + map_id_t VersionCount; + map_id_t DescriptionCount; + map_id_t DependsCount; + map_id_t DependsDataCount; + map_fileid_t ReleaseFileCount; + map_fileid_t PackageFileCount; + map_fileid_t VerFileCount; + map_fileid_t DescFileCount; + map_id_t ProvidesCount; + + /** \brief index of the first PackageFile structure + + The PackageFile structures are singly linked lists that represent + all package files that have been merged into the cache. */ + map_pointer_t FileList; + /** \brief index of the first ReleaseFile structure */ + map_pointer_t RlsFileList; + + /** \brief String representing the version system used */ + map_pointer_t VerSysName; + /** \brief native architecture the cache was built against */ + map_pointer_t Architecture; + /** \brief all architectures the cache was built against */ + map_pointer_t Architectures; + /** \brief The maximum size of a raw entry from the original Package file */ + map_filesize_t MaxVerFileSize; + /** \brief The maximum size of a raw entry from the original Translation file */ + map_filesize_t MaxDescFileSize; + + /** \brief The Pool structures manage the allocation pools that the generator uses + + Start indicates the first byte of the pool, Count is the number of objects + remaining in the pool and ItemSize is the structure size (alignment factor) + of the pool. An ItemSize of 0 indicates the pool is empty. There should be + the same number of pools as there are structure types. The generator + stores this information so future additions can make use of any unused pool + blocks. */ + DynamicMMap::Pool Pools[12]; + + /** \brief hash tables providing rapid group/package name lookup + + Each group/package name is inserted into a hash table using pkgCache::Hash(const &string) + By iterating over each entry in the hash table it is possible to iterate over + the entire list of packages. Hash Collisions are handled with a singly linked + list of packages based at the hash item. The linked list contains only + packages that match the hashing function. + In the PkgHashTable is it possible that multiple packages have the same name - + these packages are stored as a sequence in the list. + The size of both tables is the same. */ + uint32_t HashTableSize; + uint32_t GetHashTableSize() const { return HashTableSize; } + void SetHashTableSize(unsigned int const sz) { HashTableSize = sz; } + map_pointer_t GetArchitectures() const { return Architectures; } + void SetArchitectures(map_pointer_t const idx) { Architectures = idx; } + map_pointer_t * PkgHashTableP() const { return (map_pointer_t*) (this + 1); } + map_pointer_t * GrpHashTableP() const { return PkgHashTableP() + GetHashTableSize(); } + + /** \brief Hash of the file (TODO: Rename) */ + map_filesize_small_t CacheFileSize; + + bool CheckSizes(Header &Against) const APT_PURE; + Header(); +}; + /*}}}*/ +// Group structure /*{{{*/ +/** \brief groups architecture depending packages together + + On or more packages with the same name form a group, so we have + a simple way to access a package built for different architectures + Group exists in a singly linked list of group records starting at + the hash index of the name in the pkgCache::Header::GrpHashTable */ +struct pkgCache::Group +{ + /** \brief Name of the group */ + map_stringitem_t Name; + + // Linked List + /** \brief Link to the first package which belongs to the group */ + map_pointer_t FirstPackage; // Package + /** \brief Link to the last package which belongs to the group */ + map_pointer_t LastPackage; // Package + /** \brief Link to the next Group */ + map_pointer_t Next; // Group + /** \brief unique sequel ID */ + map_id_t ID; + +}; + /*}}}*/ +// Package structure /*{{{*/ +/** \brief contains information for a single unique package + + There can be any number of versions of a given package. + Package exists in a singly linked list of package records starting at + the hash index of the name in the pkgCache::Header::PkgHashTable + + A package can be created for every architecture so package names are + not unique, but it is guaranteed that packages with the same name + are sequencel ordered in the list. Packages with the same name can be + accessed with the Group. +*/ +struct pkgCache::Package +{ + /** \brief Name of the package + * Note that the access method Name() will remain. It is just this data member + * deprecated as this information is already stored and available via the + * associated Group – so it is wasting precious binary cache space */ + APT_DEPRECATED_MSG("Use the .Name() method instead of accessing the member directly") map_stringitem_t Name; + /** \brief Architecture of the package */ + map_stringitem_t Arch; + /** \brief Base of a singly linked list of versions + + Each structure represents a unique version of the package. + The version structures contain links into PackageFile and the + original text file as well as detailed information about the size + and dependencies of the specific package. In this way multiple + versions of a package can be cleanly handled by the system. + Furthermore, this linked list is guaranteed to be sorted + from Highest version to lowest version with no duplicate entries. */ + map_pointer_t VersionList; // Version + /** \brief index to the installed version */ + map_pointer_t CurrentVer; // Version + /** \brief index of the group this package belongs to */ + map_pointer_t Group; // Group the Package belongs to + + // Linked list + /** \brief Link to the next package in the same bucket */ + map_pointer_t NextPackage; // Package + /** \brief List of all dependencies on this package */ + map_pointer_t RevDepends; // Dependency + /** \brief List of all "packages" this package provide */ + map_pointer_t ProvidesList; // Provides + + // Install/Remove/Purge etc + /** \brief state that the user wishes the package to be in */ + map_number_t SelectedState; // What + /** \brief installation state of the package + + This should be "ok" but in case the installation failed + it will be different. + */ + map_number_t InstState; // Flags + /** \brief indicates if the package is installed */ + map_number_t CurrentState; // State + + /** \brief unique sequel ID + + ID is a unique value from 0 to Header->PackageCount assigned by the generator. + This allows clients to create an array of size PackageCount and use it to store + state information for the package map. For instance the status file emitter uses + this to track which packages have been emitted already. */ + map_id_t ID; + /** \brief some useful indicators of the package's state */ + map_flags_t Flags; +}; + /*}}}*/ +// Release File structure /*{{{*/ +/** \brief stores information about the release files used to generate the cache + + PackageFiles reference ReleaseFiles as we need to keep record of which + version belongs to which release e.g. for pinning. */ +struct pkgCache::ReleaseFile +{ + /** \brief physical disk file that this ReleaseFile represents */ + map_stringitem_t FileName; + /** \brief the release information + + Please see the files document for a description of what the + release information means. */ + map_stringitem_t Archive; + map_stringitem_t Codename; + map_stringitem_t Version; + map_stringitem_t Origin; + map_stringitem_t Label; + /** \brief The site the index file was fetched from */ + map_stringitem_t Site; + + /** \brief Size of the file + + Used together with the modification time as a + simple check to ensure that the Packages + file has not been altered since Cache generation. */ + map_filesize_t Size; + /** \brief Modification time for the file */ + time_t mtime; + + /** @TODO document PackageFile::Flags */ + map_flags_t Flags; + + // Linked list + /** \brief Link to the next ReleaseFile in the Cache */ + map_pointer_t NextFile; + /** \brief unique sequel ID */ + map_fileid_t ID; +}; + /*}}}*/ +// Package File structure /*{{{*/ +/** \brief stores information about the files used to generate the cache + + Package files are referenced by Version structures to be able to know + after the generation still from which Packages file includes this Version + as we need this information later on e.g. for pinning. */ +struct pkgCache::PackageFile +{ + /** \brief physical disk file that this PackageFile represents */ + map_stringitem_t FileName; + /** \brief the release information */ + map_pointer_t Release; + + map_stringitem_t Component; + map_stringitem_t Architecture; + + /** \brief indicates what sort of index file this is + + @TODO enumerate at least the possible indexes */ + map_stringitem_t IndexType; + /** \brief Size of the file + + Used together with the modification time as a + simple check to ensure that the Packages + file has not been altered since Cache generation. */ + map_filesize_t Size; + /** \brief Modification time for the file */ + time_t mtime; + + /** @TODO document PackageFile::Flags */ + map_flags_t Flags; + + // Linked list + /** \brief Link to the next PackageFile in the Cache */ + map_pointer_t NextFile; // PackageFile + /** \brief unique sequel ID */ + map_fileid_t ID; +}; + /*}}}*/ +// VerFile structure /*{{{*/ +/** \brief associates a version with a PackageFile + + This allows a full description of all Versions in all files + (and hence all sources) under consideration. */ +struct pkgCache::VerFile +{ + /** \brief index of the package file that this version was found in */ + map_pointer_t File; // PackageFile + /** \brief next step in the linked list */ + map_pointer_t NextFile; // PkgVerFile + /** \brief position in the package file */ + map_filesize_t Offset; // File offset + /** @TODO document pkgCache::VerFile::Size */ + map_filesize_t Size; +}; + /*}}}*/ +// DescFile structure /*{{{*/ +/** \brief associates a description with a Translation file */ +struct pkgCache::DescFile +{ + /** \brief index of the file that this description was found in */ + map_pointer_t File; // PackageFile + /** \brief next step in the linked list */ + map_pointer_t NextFile; // PkgVerFile + /** \brief position in the file */ + map_filesize_t Offset; // File offset + /** @TODO document pkgCache::DescFile::Size */ + map_filesize_t Size; +}; + /*}}}*/ +// Version structure /*{{{*/ +/** \brief information for a single version of a package + + The version list is always sorted from highest version to lowest + version by the generator. Equal version numbers are either merged + or handled as separate versions based on the Hash value. */ +APT_IGNORE_DEPRECATED_PUSH +struct pkgCache::Version +{ + /** \brief complete version string */ + map_stringitem_t VerStr; + /** \brief section this version is filled in */ + map_stringitem_t Section; + /** \brief source package name this version comes from + Always contains the name, even if it is the same as the binary name */ + map_stringitem_t SourcePkgName; + /** \brief source version this version comes from + Always contains the version string, even if it is the same as the binary version */ + map_stringitem_t SourceVerStr; + + /** \brief Multi-Arch capabilities of a package version */ + enum VerMultiArch { No = 0, /*!< is the default and doesn't trigger special behaviour */ + All = (1<<0), /*!< will cause that Ver.Arch() will report "all" */ + Foreign = (1<<1), /*!< can satisfy dependencies in another architecture */ + Same = (1<<2), /*!< can be co-installed with itself from other architectures */ + Allowed = (1<<3), /*!< other packages are allowed to depend on thispkg:any */ + AllForeign = All | Foreign, + AllAllowed = All | Allowed }; + + /** \brief deprecated variant of No */ + static const APT_DEPRECATED_MSG("The default value of the Multi-Arch field is no, not none") VerMultiArch None = No; + + /** \brief stores the MultiArch capabilities of this version + + Flags used are defined in pkgCache::Version::VerMultiArch + */ + map_number_t MultiArch; + + /** \brief references all the PackageFile's that this version came from + + FileList can be used to determine what distribution(s) the Version + applies to. If FileList is 0 then this is a blank version. + The structure should also have a 0 in all other fields excluding + pkgCache::Version::VerStr and Possibly pkgCache::Version::NextVer. */ + map_pointer_t FileList; // VerFile + /** \brief next (lower or equal) version in the linked list */ + map_pointer_t NextVer; // Version + /** \brief next description in the linked list */ + map_pointer_t DescriptionList; // Description + /** \brief base of the dependency list */ + map_pointer_t DependsList; // Dependency + /** \brief links to the owning package + + This allows reverse dependencies to determine the package */ + map_pointer_t ParentPkg; // Package + /** \brief list of pkgCache::Provides */ + map_pointer_t ProvidesList; // Provides + + /** \brief archive size for this version + + For Debian this is the size of the .deb file. */ + map_filesize_t Size; // These are the .deb size + /** \brief uncompressed size for this version */ + map_filesize_t InstalledSize; + /** \brief characteristic value representing this version + + No two packages in existence should have the same VerStr + and Hash with different contents. */ + unsigned short Hash; + /** \brief unique sequel ID */ + map_id_t ID; + /** \brief parsed priority value */ + map_number_t Priority; +}; +APT_IGNORE_DEPRECATED_POP + /*}}}*/ +// Description structure /*{{{*/ +/** \brief datamember of a linked list of available description for a version */ +struct pkgCache::Description +{ + /** \brief Language code of this description (translation) + + If the value has a 0 length then this is read using the Package + file else the Translation-CODE file is used. */ + map_stringitem_t language_code; + /** \brief MD5sum of the original description + + Used to map Translations of a description to a version + and to check that the Translation is up-to-date. */ + map_stringitem_t md5sum; + + /** @TODO document pkgCache::Description::FileList */ + map_pointer_t FileList; // DescFile + /** \brief next translation for this description */ + map_pointer_t NextDesc; // Description + /** \brief the text is a description of this package */ + map_pointer_t ParentPkg; // Package + + /** \brief unique sequel ID */ + map_id_t ID; +}; + /*}}}*/ +// Dependency structure /*{{{*/ +/** \brief information for a single dependency record + + The records are split up like this to ease processing by the client. + The base of the linked list is pkgCache::Version::DependsList. + All forms of dependencies are recorded here including Depends, + Recommends, Suggests, Enhances, Conflicts, Replaces and Breaks. */ +struct pkgCache::DependencyData +{ + /** \brief string of the version the dependency is applied against */ + map_stringitem_t Version; + /** \brief index of the package this depends applies to + + The generator will - if the package does not already exist - + create a blank (no version records) package. */ + map_pointer_t Package; // Package + + /** \brief Dependency type - Depends, Recommends, Conflicts, etc */ + map_number_t Type; + /** \brief comparison operator specified on the depends line + + If the high bit is set then it is a logical OR with the previous record. */ + map_flags_t CompareOp; + + map_pointer_t NextData; +}; +struct pkgCache::Dependency +{ + map_pointer_t DependencyData; // DependencyData + /** \brief version of the package which has the depends */ + map_pointer_t ParentVer; // Version + /** \brief next reverse dependency of this package */ + map_pointer_t NextRevDepends; // Dependency + /** \brief next dependency of this version */ + map_pointer_t NextDepends; // Dependency + + /** \brief unique sequel ID */ + map_id_t ID; +}; + /*}}}*/ +// Provides structure /*{{{*/ +/** \brief handles virtual packages + + When a Provides: line is encountered a new provides record is added + associating the package with a virtual package name. + The provides structures are linked off the package structures. + This simplifies the analysis of dependencies and other aspects A provides + refers to a specific version of a specific package, not all versions need to + provide that provides.*/ +struct pkgCache::Provides +{ + /** \brief index of the package providing this */ + map_pointer_t ParentPkg; // Package + /** \brief index of the version this provide line applies to */ + map_pointer_t Version; // Version + /** \brief version in the provides line (if any) + + This version allows dependencies to depend on specific versions of a + Provides, as well as allowing Provides to override existing packages. */ + map_stringitem_t ProvideVersion; + map_flags_t Flags; + /** \brief next provides (based of package) */ + map_pointer_t NextProvides; // Provides + /** \brief next provides (based of version) */ + map_pointer_t NextPkgProv; // Provides +}; + /*}}}*/ +// UNUSED StringItem structure /*{{{*/ +struct APT_DEPRECATED_MSG("No longer used in cache generation without a replacement") pkgCache::StringItem +{ + /** \brief string this refers to */ + map_ptrloc String; // StringItem + /** \brief Next link in the chain */ + map_ptrloc NextItem; // StringItem +}; + /*}}}*/ + +inline char const * pkgCache::NativeArch() + { return StrP + HeaderP->Architecture; } + +#include <apt-pkg/cacheiterators.h> + +inline pkgCache::GrpIterator pkgCache::GrpBegin() + {return GrpIterator(*this);} +inline pkgCache::GrpIterator pkgCache::GrpEnd() + {return GrpIterator(*this,GrpP);} +inline pkgCache::PkgIterator pkgCache::PkgBegin() + {return PkgIterator(*this);} +inline pkgCache::PkgIterator pkgCache::PkgEnd() + {return PkgIterator(*this,PkgP);} +inline pkgCache::PkgFileIterator pkgCache::FileBegin() + {return PkgFileIterator(*this,PkgFileP + HeaderP->FileList);} +inline pkgCache::PkgFileIterator pkgCache::FileEnd() + {return PkgFileIterator(*this,PkgFileP);} +inline pkgCache::RlsFileIterator pkgCache::RlsFileBegin() + {return RlsFileIterator(*this,RlsFileP + HeaderP->RlsFileList);} +inline pkgCache::RlsFileIterator pkgCache::RlsFileEnd() + {return RlsFileIterator(*this,RlsFileP);} + + +// Oh I wish for Real Name Space Support +class pkgCache::Namespace /*{{{*/ +{ + public: + typedef pkgCache::GrpIterator GrpIterator; + typedef pkgCache::PkgIterator PkgIterator; + typedef pkgCache::VerIterator VerIterator; + typedef pkgCache::DescIterator DescIterator; + typedef pkgCache::DepIterator DepIterator; + typedef pkgCache::PrvIterator PrvIterator; + typedef pkgCache::RlsFileIterator RlsFileIterator; + typedef pkgCache::PkgFileIterator PkgFileIterator; + typedef pkgCache::VerFileIterator VerFileIterator; + typedef pkgCache::Version Version; + typedef pkgCache::Description Description; + typedef pkgCache::Package Package; + typedef pkgCache::Header Header; + typedef pkgCache::Dep Dep; + typedef pkgCache::Flag Flag; +}; + /*}}}*/ +#endif |