X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/29f7b36cd63f16ceab825531b5c131eac4b99f9b..59194959326dbf114a5c894e4279c04844b4a793:/apt-pkg/tagfile.h?ds=sidebyside diff --git a/apt-pkg/tagfile.h b/apt-pkg/tagfile.h index 84998629d..db43bfbf9 100644 --- a/apt-pkg/tagfile.h +++ b/apt-pkg/tagfile.h @@ -1,12 +1,12 @@ // -*- mode: cpp; mode: fold -*- // Description /*{{{*/ -// $Id: tagfile.h,v 1.14 1999/07/03 06:45:40 jgg Exp $ +// $Id: tagfile.h,v 1.20 2003/05/19 17:13:57 doogie Exp $ /* ###################################################################### Fast scanner for RFC-822 type header information This parser handles Debian package files (and others). Their form is - RFC-822 type header fields in groups seperated by a blank line. + RFC-822 type header fields in groups separated by a blank line. The parser reads the file and provides methods to step linearly over it or to jump to a pre-recorded start point and read that record. @@ -17,73 +17,136 @@ ##################################################################### */ /*}}}*/ -// Header section: pkglib #ifndef PKGLIB_TAGFILE_H #define PKGLIB_TAGFILE_H -#ifdef __GNUG__ -#pragma interface "apt-pkg/tagfile.h" -#endif +#include +#include + +#include +#include +#include + +#ifndef APT_8_CLEANER_HEADERS #include +#endif + +class FileFd; class pkgTagSection { const char *Section; + struct TagData { + unsigned int StartTag; + unsigned int EndTag; + unsigned int StartValue; + unsigned int NextInBucket; + + TagData(unsigned int const StartTag) : StartTag(StartTag), NextInBucket(0) {} + }; + std::vector Tags; + unsigned int LookupTable[0x100]; + + // dpointer placeholder (for later in case we need it) + void *d; + + protected: const char *Stop; - - // We have a limit of 256 tags per section. - unsigned short Indexes[256]; - unsigned short AlphaIndexes[26 + 26*26]; - - unsigned int TagCount; - + 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); - string FindS(const char *Tag); - signed int FindI(const char *Tag,signed long Default = 0); - bool pkgTagSection::FindFlag(const char *Tag,unsigned long &Flags, - unsigned long Flag); - bool Scan(const char *Start,unsigned long MaxLength); - inline unsigned long size() {return Stop - Section;}; - - inline unsigned int Count() {return TagCount;}; - inline void Get(const char *&Start,const char *&Stop,unsigned int I) - {Start = Section + Indexes[I]; Stop = Section + Indexes[I+1];} - - inline void GetSection(const char *&Start,const char *&Stop) + bool Find(const char *Tag,const char *&Start, const char *&End) 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; + 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 *Tag,unsigned long &Flags, + unsigned long Flag) const; + bool static FindFlag(unsigned long &Flags, unsigned long Flag, + const char* Start, const char* Stop); + + /** \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); + + /** \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 occurance is available via Find methods. + */ + unsigned int Count() const; + bool Exists(const char* const Tag) const; + + inline void Get(const char *&Start,const char *&Stop,unsigned int I) const + {Start = Section + Tags[I].StartTag; Stop = Section + Tags[I+1].StartTag;} + + inline void GetSection(const char *&Start,const char *&Stop) const { Start = Section; Stop = this->Stop; }; - pkgTagSection() : Section(0), Stop(0) {}; + pkgTagSection(); + virtual ~pkgTagSection() {}; }; +class pkgTagFilePrivate; class pkgTagFile { - FileFd &Fd; - char *Buffer; - char *Start; - char *End; - unsigned long Left; - unsigned long iOffset; - unsigned long Size; - - bool Fill(); - + pkgTagFilePrivate *d; + + APT_HIDDEN bool Fill(); + APT_HIDDEN bool Resize(); + APT_HIDDEN bool Resize(unsigned long long const newSize); + public: bool Step(pkgTagSection &Section); - inline unsigned long Offset() {return iOffset;}; - bool Jump(pkgTagSection &Tag,unsigned long Offset); + unsigned long Offset(); + bool Jump(pkgTagSection &Tag,unsigned long long Offset); + + void Init(FileFd *F,unsigned long long Size = 32*1024); + + pkgTagFile(FileFd *F,unsigned long long Size = 32*1024); + virtual ~pkgTagFile(); +}; - pkgTagFile(FileFd &F,unsigned long Size = 32*1024); - ~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 +{ + 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[], + TFRewriteData *Rewrite); #endif