// -*- mode: cpp; mode: fold -*-
// Description /*{{{*/
-// $Id: tagfile.h,v 1.5 1998/07/16 06:08:40 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 and provides methods to step linearly
+ 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.
A second class is used to perform pre-parsing of the record. It works
##################################################################### */
/*}}}*/
-// Header section: pkglib
#ifndef PKGLIB_TAGFILE_H
#define PKGLIB_TAGFILE_H
-#ifdef __GNUG__
-#pragma interface "apt-pkg/tagfile.h"
-#endif
+#include <stdio.h>
+#include <string>
+
+#ifndef APT_8_CLEANER_HEADERS
#include <apt-pkg/fileutl.h>
+#endif
+
+class FileFd;
class pkgTagSection
{
const char *Section;
- const char *Stop;
-
// We have a limit of 256 tags per section.
- unsigned short Indexes[256];
+ 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;
+ }
+
+ 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);
+ 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 ;
+ 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 const FindFlag(unsigned long &Flags, unsigned long Flag,
+ const char* Start, const char* Stop);
bool Scan(const char *Start,unsigned long MaxLength);
- inline unsigned long size() {return Stop - Section;};
-
- pkgTagSection() : Section(0), Stop(0) {};
+ 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];}
+
+ inline void GetSection(const char *&Start,const char *&Stop) const
+ {
+ Start = Section;
+ Stop = this->Stop;
+ };
+
+ pkgTagSection() : Section(0), TagCount(0), Stop(0) {};
+ virtual ~pkgTagSection() {};
};
+class pkgTagFilePrivate;
class pkgTagFile
{
- File &Fd;
- char *Buffer;
- char *Start;
- char *End;
- unsigned long Left;
- unsigned long iOffset;
-
+ pkgTagFilePrivate *d;
+
bool Fill();
-
+ bool Resize();
+
public:
bool Step(pkgTagSection &Section);
- inline unsigned long Offset() {return iOffset;};
-
- pkgTagFile(File &F);
+ unsigned long Offset();
+ bool Jump(pkgTagSection &Tag,unsigned long long Offset);
+
+ pkgTagFile(FileFd *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
+{
+ 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