// -*- 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
#include <apt-pkg/macros.h>
#include <stdio.h>
+#include <stdint.h>
#include <string>
+#include <vector>
+#include <list>
#ifndef APT_8_CLEANER_HEADERS
#include <apt-pkg/fileutl.h>
#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 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 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;};
- bool Exists(const char* const Tag);
-
- 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();
- virtual ~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;
+};
+
+
+/* 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;
APT_HIDDEN bool Fill();
APT_HIDDEN bool Resize();
unsigned long Offset();
bool Jump(pkgTagSection &Tag,unsigned long long Offset);
- void Init(FileFd *F,unsigned long long Size = 32*1024);
+ void Init(FileFd * const F,unsigned long long const Size = 32*1024);
- pkgTagFile(FileFd *F,unsigned long long 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
projects / apt.git / blobdiff