// -*- 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
#ifndef PKGLIB_TAGFILE_H
#define PKGLIB_TAGFILE_H
+#include <apt-pkg/macros.h>
+
#include <stdio.h>
+#include <stdint.h>
#include <string>
+#include <vector>
+#include <list>
+#ifdef APT_PKG_EXPOSE_STRING_VIEW
+#include <apt-pkg/string_view.h>
+#endif
#ifndef APT_8_CLEANER_HEADERS
#include <apt-pkg/fileutl.h>
#endif
class FileFd;
+class pkgTagSectionPrivate;
+class pkgTagFilePrivate;
+/** \class pkgTagSection parses a single deb822 stanza and provides various Find methods
+ * to extract the included values. It can also be used to modify and write a
+ * valid deb822 stanza optionally (re)ordering the fields inside the stanza.
+ *
+ * Beware: This class does \b NOT support (#-)comments in in- or output!
+ * If the input contains comments they have to be stripped first like pkgTagFile
+ * does with SUPPORT_COMMENTS flag set. */
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;
- }
+ unsigned int AlphaIndexes[128];
+ unsigned int BetaIndexes[128];
+
+ pkgTagSectionPrivate * const d;
+
+ APT_HIDDEN bool FindInternal(unsigned int Pos,const char *&Start, const char *&End) const;
+#if defined(APT_PKG_EXPOSE_STRING_VIEW)
+ APT_HIDDEN APT::StringView FindInternal(unsigned int Pos) const;
+ APT_HIDDEN APT::StringView FindRawInternal(unsigned int Pos) const;
+#endif
+ APT_HIDDEN signed int FindIInternal(unsigned int Pos,signed long Default = 0) const;
+ APT_HIDDEN bool FindBInternal(unsigned int Pos, bool Default = false) const;
+ APT_HIDDEN unsigned long long FindULLInternal(unsigned int Pos, unsigned long long const &Default = 0) const;
+ APT_HIDDEN bool FindFlagInternal(unsigned int Pos,uint8_t &Flags, uint8_t const Flag) const;
+ APT_HIDDEN bool FindFlagInternal(unsigned int Pos,unsigned long &Flags, unsigned long Flag) const;
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;};
-
+
+#if !defined(APT_PKG_EXPOSE_STRING_VIEW) || defined(APT_COMPILING_TAGFILE_COMPAT_CC)
bool Find(const char *Tag,const char *&Start, const char *&End) const;
- bool Find(const char *Tag,unsigned &Pos) const;
- std::string FindS(const char *Tag) const;
- signed int FindI(const char *Tag,signed long Default = 0) const ;
+ bool Find(const char *Tag,unsigned int &Pos) 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 FindFlag(const char *Tag,unsigned long &Flags,
unsigned long Flag) const;
- bool static const FindFlag(unsigned long &Flags, unsigned long Flag,
+ bool Exists(const char* const Tag) const;
+#endif
+ // TODO: Remove internally
+ std::string FindS(const char *Tag) const;
+ std::string FindRawS(const char *Tag) const;
+
+ // Functions for lookup with a perfect hash function
+ enum class Key;
+ APT_HIDDEN bool Find(Key key,const char *&Start, const char *&End) const;
+ APT_HIDDEN bool Find(Key key,unsigned int &Pos) const;
+ APT_HIDDEN signed int FindI(Key key,signed long Default = 0) const;
+ APT_HIDDEN bool FindB(Key key, bool Default = false) const;
+ APT_HIDDEN unsigned long long FindULL(Key key, unsigned long long const &Default = 0) const;
+ APT_HIDDEN bool FindFlag(Key key,uint8_t &Flags, uint8_t const Flag) const;
+ APT_HIDDEN bool FindFlag(Key key,unsigned long &Flags, unsigned long Flag) const;
+ APT_HIDDEN bool Exists(Key key) const;
+#ifdef APT_PKG_EXPOSE_STRING_VIEW
+ APT_HIDDEN APT::StringView Find(Key key) const;
+ APT_HIDDEN APT::StringView FindRaw(Key key) const;
+ APT_HIDDEN bool Find(APT::StringView Tag,const char *&Start, const char *&End) const;
+ APT_HIDDEN bool Find(APT::StringView Tag,unsigned int &Pos) const;
+ APT_HIDDEN APT::StringView Find(APT::StringView Tag) const;
+ APT_HIDDEN APT::StringView FindRaw(APT::StringView Tag) const;
+ APT_HIDDEN signed int FindI(APT::StringView Tag,signed long Default = 0) const;
+ APT_HIDDEN bool FindB(APT::StringView, bool Default = false) const;
+ APT_HIDDEN unsigned long long FindULL(APT::StringView Tag, unsigned long long const &Default = 0) const;
+
+ APT_HIDDEN bool FindFlag(APT::StringView Tag,uint8_t &Flags,
+ uint8_t const Flag) const;
+ APT_HIDDEN bool FindFlag(APT::StringView Tag,unsigned long &Flags,
+ unsigned long Flag) const;
+ APT_HIDDEN bool Exists(APT::StringView Tag) const;
+#endif
+
+ bool static FindFlag(uint8_t &Flags, uint8_t const Flag,
+ const char* const Start, const char* const Stop);
+ 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 SupportComments);
+
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];}
-
+ void TrimRecord(bool BeforeRecord, const char* &End, bool SupportComments);
+
+ /** \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;
+
+ 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<Tag> const &Rewrite = std::vector<Tag>()) const;
};
-class pkgTagFilePrivate;
+
+/** \class pkgTagFile reads and prepares a deb822 formatted file for parsing
+ * via #pkgTagSection. The default mode tries to be as fast as possible and
+ * assumes perfectly valid (machine generated) files like Packages. Support
+ * for comments e.g. needs to be enabled explicitly. */
class pkgTagFile
{
- pkgTagFilePrivate *d;
+ pkgTagFilePrivate * const d;
- bool Fill();
- bool Resize();
-
- public:
+public:
bool Step(pkgTagSection &Section);
unsigned long Offset();
bool Jump(pkgTagSection &Tag,unsigned long long Offset);
- pkgTagFile(FileFd *F,unsigned long long Size = 32*1024);
+ enum Flags
+ {
+ STRICT = 0,
+ SUPPORT_COMMENTS = 1 << 0,
+ };
+
+ void Init(FileFd * const F, pkgTagFile::Flags const Flags);
+ void Init(FileFd * const F);
+
+ pkgTagFile(FileFd * const F, pkgTagFile::Flags const Flags);
+ pkgTagFile(FileFd * const F);
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;
+
+APT_IGNORE_DEPRECATED_PUSH
+struct APT_DEPRECATED_MSG("Use pkgTagSection::Tag and pkgTagSection::Write() instead") 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_MSG("Use pkgTagSection::Tag and pkgTagSection::Write() instead") bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[],
TFRewriteData *Rewrite);
+APT_IGNORE_DEPRECATED_POP
#endif
projects / apt.git / blobdiff