// -*- mode: cpp; mode: fold -*- // Description /*{{{*/ // $Id: cachedb.h,v 1.4 2004/05/08 19:41:01 mdz Exp $ /* ###################################################################### CacheDB Simple uniform interface to a cache database. ##################################################################### */ /*}}}*/ #ifndef CACHEDB_H #define CACHEDB_H #include <apt-pkg/debfile.h> #include <apt-pkg/hashes.h> #include <db.h> #include <string> #include <errno.h> #include <stdint.h> #include <stdio.h> #include <string.h> #include "contents.h" #include "sources.h" class FileFd; class CacheDB { protected: // Database state/access DBT Key; DBT Data; char TmpKey[600]; DB *Dbp; bool DBLoaded; bool ReadOnly; std::string DBFile; // Generate a key for the DB of a given type void _InitQuery(const char *Type) { memset(&Key,0,sizeof(Key)); memset(&Data,0,sizeof(Data)); Key.data = TmpKey; Key.size = snprintf(TmpKey,sizeof(TmpKey),"%s:%s",FileName.c_str(), Type); } void InitQueryStats() { _InitQuery("st"); } void InitQuerySource() { _InitQuery("cs"); } void InitQueryControl() { _InitQuery("cl"); } void InitQueryContent() { _InitQuery("cn"); } inline bool Get() { return Dbp->get(Dbp,0,&Key,&Data,0) == 0; }; inline bool Put(const void *In,unsigned long const &Length) { if (ReadOnly == true) return true; Data.size = Length; Data.data = (void *)In; if (DBLoaded == true && (errno = Dbp->put(Dbp,0,&Key,&Data,0)) != 0) { DBLoaded = false; return false; } return true; } bool OpenFile(); void CloseFile(); bool OpenDebFile(); void CloseDebFile(); // GetCurStat needs some compat code, see lp #1274466) bool GetCurStatCompatOldFormat(); bool GetCurStatCompatNewFormat(); bool GetCurStat(); bool GetFileStat(bool const &doStat = false); bool LoadControl(); bool LoadContents(bool const &GenOnly); bool LoadSource(); bool GetHashes(bool const GenOnly, unsigned int const DoHashes); // Stat info stored in the DB, Fixed types since it is written to disk. enum FlagList {FlControl = (1<<0),FlMD5=(1<<1),FlContents=(1<<2), FlSize=(1<<3), FlSHA1=(1<<4), FlSHA256=(1<<5), FlSHA512=(1<<6), FlSource=(1<<7) }; // the on-disk format changed (FileSize increased to 64bit) in // commit 650faab0 which will lead to corruption with old caches struct StatStoreOldFormat { uint32_t Flags; uint32_t mtime; uint32_t FileSize; uint8_t MD5[16]; uint8_t SHA1[20]; uint8_t SHA256[32]; } CurStatOldFormat; // WARNING: this struct is read/written to the DB so do not change the // layout of the fields (see lp #1274466), only append to it struct StatStore { uint32_t Flags; uint32_t mtime; uint64_t FileSize; uint8_t MD5[16]; uint8_t SHA1[20]; uint8_t SHA256[32]; uint8_t SHA512[64]; } CurStat; struct StatStore OldStat; // 'set' state std::string FileName; FileFd *Fd; debDebFile *DebFile; public: // Data collection helpers debDebFile::MemControlExtract Control; ContentsExtract Contents; DscExtract Dsc; HashStringList HashesList; // Runtime statistics struct Stats { double Bytes; double MD5Bytes; double SHA1Bytes; double SHA256Bytes; double SHA512Bytes; unsigned long Packages; unsigned long Misses; unsigned long long DeLinkBytes; inline void Add(const Stats &S) { Bytes += S.Bytes; MD5Bytes += S.MD5Bytes; SHA1Bytes += S.SHA1Bytes; SHA256Bytes += S.SHA256Bytes; SHA512Bytes += S.SHA512Bytes; Packages += S.Packages; Misses += S.Misses; DeLinkBytes += S.DeLinkBytes; }; Stats() : Bytes(0), MD5Bytes(0), SHA1Bytes(0), SHA256Bytes(0), SHA512Bytes(0),Packages(0), Misses(0), DeLinkBytes(0) {}; } Stats; bool ReadyDB(std::string const &DB = ""); inline bool DBFailed() {return Dbp != 0 && DBLoaded == false;}; inline bool Loaded() {return DBLoaded == true;}; inline unsigned long long GetFileSize(void) {return CurStat.FileSize;} bool SetFile(std::string const &FileName,struct stat St,FileFd *Fd); // terrible old overloaded interface bool GetFileInfo(std::string const &FileName, bool const &DoControl, bool const &DoContents, bool const &GenContentsOnly, bool const DoSource, unsigned int const DoHashes, bool const &checkMtime = false); bool Finish(); bool Clean(); explicit CacheDB(std::string const &DB); ~CacheDB(); }; #endif