merge from the debian-sid branch

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

diff --git a/apt-pkg/tagfile.h b/apt-pkg/tagfile.h
index dd481ba510ea9fe1838ffe278ac1cc962493f293..f63a51d07843be82fe63a95daf64ff24797e5214 100644 (file)
--- a/apt-pkg/tagfile.h
+++ b/apt-pkg/tagfile.h
@@ -20,25 +20,34 @@
 #ifndef PKGLIB_TAGFILE_H
 #define PKGLIB_TAGFILE_H
 
-#ifdef __GNUG__
-#pragma interface "apt-pkg/tagfile.h"
-#endif 
 
 #include <apt-pkg/fileutl.h>
-#include <apt-pkg/mmap.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 short AlphaIndexes[0x100];
+   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;};
@@ -53,8 +62,11 @@ class pkgTagSection
    bool Scan(const char *Start,unsigned long MaxLength);
    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];}
            
@@ -70,23 +82,23 @@ class pkgTagSection
 class pkgTagFile
 {
    FileFd &Fd;
-   MMap *Map;
    char *Buffer;
    char *Start;
    char *End;
    bool Done;
    unsigned long iOffset;
    unsigned long Size;
-   
+
    bool Fill();
-   
+   bool Resize();
+
    public:
 
    bool Step(pkgTagSection &Section);
    inline unsigned long Offset() {return iOffset;};
    bool Jump(pkgTagSection &Tag,unsigned long Offset);
 
-   pkgTagFile(FileFd *F,unsigned long Size = 64*1024);
+   pkgTagFile(FileFd *F,unsigned long Size = 32*1024);
    ~pkgTagFile();
 };