* merged from mvo

1 files changed, 23 insertions, 55 deletions

diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index 8fcbeb23b..040562fff 100644
--- a/apt-pkg/tagfile.cc
+++ b/apt-pkg/tagfile.cc
@@ -33,33 +33,22 @@ using std::string;
 /* */
 pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) :
      Fd(*pFd),
-     Size(Size),
-     Map(NULL),
-     Buffer(0)
+     Size(Size)
 {
    if (Fd.IsOpen() == false)
    {
+      Buffer = 0;
       Start = End = Buffer = 0;
       Done = true;
       iOffset = 0;
-      Map = NULL;
       return;
    }
    
-   // check if we can MMap it
-   if(Fd.Size() == 0)
-   {
-      Buffer = new char[Size];
-      Start = End = Buffer;
-      Done = false;
-      Fill();
-   } else {
-      Map = new MMap (Fd, MMap::Public | MMap::ReadOnly);
-      Buffer = (char *) Map->Data ();
-      Start = Buffer;
-      End = Buffer + Map->Size ();
-   }
+   Buffer = new char[Size];
+   Start = End = Buffer;
+   Done = false;
    iOffset = 0;
+   Fill();
 }
 									/*}}}*/
 // TagFile::~pkgTagFile - Destructor					/*{{{*/
@@ -67,8 +56,7 @@ pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) :
 /* */
 pkgTagFile::~pkgTagFile()
 {
-   if(!Map) delete [] Buffer;
-   delete Map;
+   delete [] Buffer;
 }
 									/*}}}*/
 // TagFile::Step - Advance to the next section				/*{{{*/
@@ -76,15 +64,8 @@ pkgTagFile::~pkgTagFile()
 /* If the Section Scanner fails we refill the buffer and try again. */
 bool pkgTagFile::Step(pkgTagSection &Tag)
 {
-   if ((Map != NULL) && (Start == End))
-      return false;
-
    if (Tag.Scan(Start,End - Start) == false)
    {
-      if (Map != NULL)
-	 return _error->Error(_("Unable to parse package file %s (1)"),
-			      Fd.Name().c_str());
-
       if (Fill() == false)
 	 return false;
       
@@ -158,30 +139,23 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset)
       return Step(Tag);
    }
 
+   // Reposition and reload..
    iOffset = Offset;
-   if (Map != NULL)
-   {
-      Start = Buffer + iOffset;
-   } 
-   else 
-   {
-      // Reposition and reload..
-      Done = false;
-      if (Fd.Seek(Offset) == false)
-	 return false;
-      End = Start = Buffer;
+   Done = false;
+   if (Fd.Seek(Offset) == false)
+      return false;
+   End = Start = Buffer;
    
-      if (Fill() == false)
-	 return false;
+   if (Fill() == false)
+      return false;
 
-      if (Tag.Scan(Start,End - Start) == true)
-	 return true;
+   if (Tag.Scan(Start,End - Start) == true)
+      return true;
+   
+   // This appends a double new line (for the real eof handling)
+   if (Fill() == false)
+      return false;
    
-      // This appends a double new line (for the real eof handling)
-      if (Fill() == false)
-	 return false;
-   }
-
    if (Tag.Scan(Start,End - Start) == false)
       return _error->Error(_("Unable to parse package file %s (2)"),Fd.Name().c_str());
    
@@ -192,12 +166,12 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset)
 // ---------------------------------------------------------------------
 /* This looks for the first double new line in the data stream. It also
    indexes the tags in the section. This very simple hash function for the
-   first 3 letters gives very good performance on the debian package files */
+   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) ^ (Res << 2);
+      Res = ((unsigned long)(*Text) & 0xDF) ^ (Res << 1);
    return Res & 0xFF;
 }
 
@@ -207,7 +181,7 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
    Stop = Section = Start;
    memset(AlphaIndexes,0,sizeof(AlphaIndexes));
 
-   if (Stop == 0 || MaxLength == 0)
+   if (Stop == 0)
       return false;
    
    TagCount = 0;
@@ -238,12 +212,6 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
       Stop++;
    }
 
-   if ((Stop+1 >= End) && (End[-1] == '\n' || End[-1] == '\r'))
-   {
-      Indexes[TagCount] = (End - 1) - Section;
-      return true;
-   }
-
    return false;
 }
 									/*}}}*/