X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/0418949ebe9fc886e7794fa1de17c8b6c74e65ea..bb0f6a34c4cebea7884de828c011dc85765ff820:/apt-pkg/tagfile.h diff --git a/apt-pkg/tagfile.h b/apt-pkg/tagfile.h index fd24471c1..19c07595e 100644 --- a/apt-pkg/tagfile.h +++ b/apt-pkg/tagfile.h @@ -1,6 +1,5 @@ // -*- mode: cpp; mode: fold -*- // Description /*{{{*/ -// $Id: tagfile.h,v 1.20 2003/05/19 17:13:57 doogie Exp $ /* ###################################################################### Fast scanner for RFC-822 type header information @@ -20,81 +19,133 @@ #ifndef PKGLIB_TAGFILE_H #define PKGLIB_TAGFILE_H +#include + #include #include +#include +#include #ifndef APT_8_CLEANER_HEADERS #include #endif class FileFd; +class pkgTagSectionPrivate; class pkgTagSection { const char *Section; - // We have a limit of 256 tags per section. - unsigned int Indexes[256]; unsigned int AlphaIndexes[0x100]; - unsigned int TagCount; - // dpointer placeholder (for later in case we need it) - void *d; - /* This very simple hash function for the last 8 letters gives - very good performance on the debian package files */ - inline static unsigned long AlphaHash(const char *Text, const char *End = 0) - { - unsigned long Res = 0; - for (; Text != End && *Text != ':' && *Text != 0; Text++) - Res = ((unsigned long)(*Text) & 0xDF) ^ (Res << 1); - return Res & 0xFF; - } + pkgTagSectionPrivate * const d; protected: const char *Stop; public: - + inline bool operator ==(const pkgTagSection &rhs) {return Section == rhs.Section;}; inline bool operator !=(const pkgTagSection &rhs) {return Section != rhs.Section;}; - + bool Find(const char *Tag,const char *&Start, const char *&End) const; - bool Find(const char *Tag,unsigned &Pos) const; + bool Find(const char *Tag,unsigned int &Pos) const; std::string FindS(const char *Tag) const; - signed int FindI(const char *Tag,signed long Default = 0) const ; + std::string FindRawS(const char *Tag) const; + signed int FindI(const char *Tag,signed long Default = 0) const; + bool FindB(const char *Tag, bool const &Default = false) const; unsigned long long FindULL(const char *Tag, unsigned long long const &Default = 0) const; + bool FindFlag(const char * const Tag,uint8_t &Flags, + uint8_t const Flag) const; + bool static FindFlag(uint8_t &Flags, uint8_t const Flag, + const char* const Start, const char* const Stop); bool FindFlag(const char *Tag,unsigned long &Flags, unsigned long Flag) const; - bool static const FindFlag(unsigned long &Flags, unsigned long Flag, + bool static FindFlag(unsigned long &Flags, unsigned long Flag, const char* Start, const char* Stop); - bool Scan(const char *Start,unsigned long MaxLength); + + /** \brief searches the boundaries of the current section + * + * While parameter Start marks the beginning of the section, this method + * will search for the first double newline in the data stream which marks + * the end of the section. It also does a first pass over the content of + * the section parsing it as encountered for processing later on by Find + * + * @param Start is the beginning of the section + * @param MaxLength is the size of valid data in the stream pointed to by Start + * @param Restart if enabled internal state will be cleared, otherwise it is + * assumed that now more data is available in the stream and the parsing will + * start were it encountered insufficent data the last time. + * + * @return \b true if section end was found, \b false otherwise. + * Beware that internal state will be inconsistent if \b false is returned! + */ + APT_MUSTCHECK bool Scan(const char *Start, unsigned long MaxLength, bool const Restart = true); + inline unsigned long size() const {return Stop - Section;}; void Trim(); virtual void TrimRecord(bool BeforeRecord, const char* &End); - - inline unsigned int Count() const {return TagCount;}; - inline bool Exists(const char* const Tag) {return AlphaIndexes[AlphaHash(Tag)] != 0;} - - inline void Get(const char *&Start,const char *&Stop,unsigned int I) const - {Start = Section + Indexes[I]; Stop = Section + Indexes[I+1];} - + + /** \brief amount of Tags in the current section + * + * Note: if a Tag is mentioned repeatly it will be counted multiple + * times, but only the last occurrence is available via Find methods. + */ + unsigned int Count() const; + bool Exists(const char* const Tag) const; + + void Get(const char *&Start,const char *&Stop,unsigned int I) const; + inline void GetSection(const char *&Start,const char *&Stop) const { Start = Section; Stop = this->Stop; }; - - pkgTagSection() : Section(0), TagCount(0), Stop(0) {}; - virtual ~pkgTagSection() {}; + + pkgTagSection(); + virtual ~pkgTagSection(); + + struct Tag + { + enum ActionType { REMOVE, RENAME, REWRITE } Action; + std::string Name; + std::string Data; + + static Tag Remove(std::string const &Name); + static Tag Rename(std::string const &OldName, std::string const &NewName); + static Tag Rewrite(std::string const &Name, std::string const &Data); + private: + Tag(ActionType const Action, std::string const &Name, std::string const &Data) : + Action(Action), Name(Name), Data(Data) {} + }; + + /** Write this section (with optional rewrites) to a file + * + * @param File to write the section to + * @param Order in which tags should appear in the file + * @param Rewrite is a set of tags to be renamed, rewritten and/or removed + * @return \b true if successful, otherwise \b false + */ + bool Write(FileFd &File, char const * const * const Order = NULL, std::vector const &Rewrite = std::vector()) const; +}; + + +/* For user generated file the parser should be a bit more relaxed in exchange + for being a bit slower to allow comments and new lines all over the place */ +class pkgUserTagSection : public pkgTagSection +{ + virtual void TrimRecord(bool BeforeRecord, const char* &End) APT_OVERRIDE; }; class pkgTagFilePrivate; class pkgTagFile { - pkgTagFilePrivate *d; + pkgTagFilePrivate * const d; - bool Fill(); - bool Resize(); + APT_HIDDEN bool Fill(); + APT_HIDDEN bool Resize(); + APT_HIDDEN bool Resize(unsigned long long const newSize); public: @@ -102,24 +153,25 @@ class pkgTagFile unsigned long Offset(); bool Jump(pkgTagSection &Tag,unsigned long long Offset); - pkgTagFile(FileFd *F,unsigned long long Size = 32*1024); + void Init(FileFd * const F,unsigned long long const Size = 32*1024); + + pkgTagFile(FileFd * const F,unsigned long long Size = 32*1024); virtual ~pkgTagFile(); }; -/* This is the list of things to rewrite. The rewriter - goes through and changes or adds each of these headers - to suit. A zero forces the header to be erased, an empty string - causes the old value to be used. (rewrite rule ignored) */ -struct TFRewriteData +extern const char **TFRewritePackageOrder; +extern const char **TFRewriteSourceOrder; + +// Use pkgTagSection::Tag and pkgTagSection::Write() instead +APT_IGNORE_DEPRECATED_PUSH +struct APT_DEPRECATED TFRewriteData { const char *Tag; const char *Rewrite; const char *NewTag; }; -extern const char **TFRewritePackageOrder; -extern const char **TFRewriteSourceOrder; - -bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[], +APT_DEPRECATED bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[], TFRewriteData *Rewrite); +APT_IGNORE_DEPRECATED_POP #endif