* apt-pkg/depcache.cc:

[ntk/apt.git] / apt-pkg / tagfile.h

diff --git a/apt-pkg/tagfile.h b/apt-pkg/tagfile.h
index 446b5bf..f63a51d 100644 (file)
--- a/apt-pkg/tagfile.h
+++ b/apt-pkg/tagfile.h
@@ -1,14 +1,14 @@
 // -*- 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
@@ -17,54 +17,105 @@
    
    ##################################################################### */
                                                                        /*}}}*/
-// Header section: pkglib
 #ifndef PKGLIB_TAGFILE_H
 #define PKGLIB_TAGFILE_H
 
-#ifdef __GNUG__
-#pragma interface "apt-pkg/tagfile.h"
-#endif 
 
 #include <apt-pkg/fileutl.h>
-
+#include <stdio.h>
+    
 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;
-     
+
+   /* 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 &Pos) const;
+   string FindS(const char *Tag) const;
+   signed int FindI(const char *Tag,signed long Default = 0) const ;
+   bool FindFlag(const char *Tag,unsigned long &Flags,
+                unsigned long Flag) const;
    bool Scan(const char *Start,unsigned long MaxLength);
-   inline unsigned long size() {return Stop - Section;};
-
+   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];}
+           
+   inline void GetSection(const char *&Start,const char *&Stop) const
+   {
+      Start = Section;
+      Stop = this->Stop;
+   };
+   
    pkgTagSection() : Section(0), Stop(0) {};
 };
 
 class pkgTagFile
 {
-   File &Fd;
+   FileFd &Fd;
    char *Buffer;
    char *Start;
    char *End;
-   unsigned long Left;
+   bool Done;
    unsigned long iOffset;
-   
+   unsigned long Size;
+
    bool Fill();
-   
+   bool Resize();
+
    public:
 
    bool Step(pkgTagSection &Section);
    inline unsigned long Offset() {return iOffset;};
-   
-   pkgTagFile(File &F);
+   bool Jump(pkgTagSection &Tag,unsigned long Offset);
+
+   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