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130 lines
4.0 KiB
130 lines
4.0 KiB
// -*- mode: cpp; mode: fold -*-
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// Description /*{{{*/
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// $Id: tagfile.h,v 1.20 2003/05/19 17:13:57 doogie Exp $
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/* ######################################################################
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Fast scanner for RFC-822 type header information
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This parser handles Debian package files (and others). Their form is
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RFC-822 type header fields in groups separated by a blank line.
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The parser reads the file and provides methods to step linearly
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over it or to jump to a pre-recorded start point and read that record.
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A second class is used to perform pre-parsing of the record. It works
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by indexing the start of each header field and providing lookup
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functions for header fields.
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##################################################################### */
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/*}}}*/
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#ifndef PKGLIB_TAGFILE_H
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#define PKGLIB_TAGFILE_H
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#include <apt-pkg/macros.h>
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#include <stdio.h>
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#include <string>
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#ifndef APT_8_CLEANER_HEADERS
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#include <apt-pkg/fileutl.h>
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#endif
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class FileFd;
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class pkgTagSection
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{
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const char *Section;
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// We have a limit of 256 tags per section.
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unsigned int Indexes[256];
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unsigned int AlphaIndexes[0x100];
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unsigned int TagCount;
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// dpointer placeholder (for later in case we need it)
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void *d;
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/* This very simple hash function for the last 8 letters gives
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very good performance on the debian package files */
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inline static unsigned long AlphaHash(const char *Text, const char *End = 0)
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{
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unsigned long Res = 0;
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for (; Text != End && *Text != ':' && *Text != 0; Text++)
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Res = ((unsigned long)(*Text) & 0xDF) ^ (Res << 1);
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return Res & 0xFF;
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}
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protected:
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const char *Stop;
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public:
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inline bool operator ==(const pkgTagSection &rhs) {return Section == rhs.Section;};
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inline bool operator !=(const pkgTagSection &rhs) {return Section != rhs.Section;};
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bool Find(const char *Tag,const char *&Start, const char *&End) const;
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bool Find(const char *Tag,unsigned int &Pos) const;
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std::string FindS(const char *Tag) const;
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signed int FindI(const char *Tag,signed long Default = 0) const ;
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unsigned long long FindULL(const char *Tag, unsigned long long const &Default = 0) const;
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bool FindFlag(const char *Tag,unsigned long &Flags,
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unsigned long Flag) const;
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bool static FindFlag(unsigned long &Flags, unsigned long Flag,
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const char* Start, const char* Stop);
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bool Scan(const char *Start,unsigned long MaxLength);
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inline unsigned long size() const {return Stop - Section;};
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void Trim();
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virtual void TrimRecord(bool BeforeRecord, const char* &End);
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inline unsigned int Count() const {return TagCount;};
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bool Exists(const char* const Tag);
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inline void Get(const char *&Start,const char *&Stop,unsigned int I) const
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{Start = Section + Indexes[I]; Stop = Section + Indexes[I+1];}
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inline void GetSection(const char *&Start,const char *&Stop) const
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{
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Start = Section;
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Stop = this->Stop;
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};
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pkgTagSection();
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virtual ~pkgTagSection() {};
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};
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class pkgTagFilePrivate;
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class pkgTagFile
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{
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pkgTagFilePrivate *d;
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APT_HIDDEN bool Fill();
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APT_HIDDEN bool Resize();
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APT_HIDDEN bool Resize(unsigned long long const newSize);
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public:
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bool Step(pkgTagSection &Section);
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unsigned long Offset();
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bool Jump(pkgTagSection &Tag,unsigned long long Offset);
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void Init(FileFd *F,unsigned long long Size = 32*1024);
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pkgTagFile(FileFd *F,unsigned long long Size = 32*1024);
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virtual ~pkgTagFile();
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};
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/* This is the list of things to rewrite. The rewriter
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goes through and changes or adds each of these headers
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to suit. A zero forces the header to be erased, an empty string
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causes the old value to be used. (rewrite rule ignored) */
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struct TFRewriteData
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{
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const char *Tag;
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const char *Rewrite;
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const char *NewTag;
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};
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extern const char **TFRewritePackageOrder;
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extern const char **TFRewriteSourceOrder;
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bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[],
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TFRewriteData *Rewrite);
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#endif
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