* apt-pkg/depcache.cc:

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

diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index 1e5bc81a4b6b93846101f96882be358791a4a881..79ff18de4063af437eb8415859eead6dba428f5c 100644 (file)
--- a/apt-pkg/tagfile.cc
+++ b/apt-pkg/tagfile.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
-// $Id: tagfile.cc,v 1.36 2003/04/27 05:59:14 doogie Exp $
+// $Id: tagfile.cc,v 1.37.2.2 2003/12/31 16:02:30 mdz Exp $
 /* ######################################################################
 
    Fast scanner for RFC-822 type header information
@@ -31,23 +31,24 @@ using std::string;
 // TagFile::pkgTagFile - Constructor                                   /*{{{*/
 // ---------------------------------------------------------------------
 /* */
-pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) : Fd(*pFd), Size(Size)
+pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) :
+     Fd(*pFd),
+     Size(Size)
 {
-   if (Fd.IsOpen() == false)
+   if (Fd.IsOpen() == false || Fd.Size() == 0)
    {
       Buffer = 0;
       Start = End = Buffer = 0;
-      Done = true;
       iOffset = 0;
+      Map = NULL;
       return;
    }
    
-   CurSize = Size;
-   Buffer = new char[Size];
-   Start = End = Buffer;
-   Done = false;
+   Map = new MMap (Fd, MMap::Public | MMap::ReadOnly);
+   Buffer = (char *) Map->Data ();
+   Start = Buffer;
+   End = Buffer + Map->Size ();
    iOffset = 0;
-   Fill();
 }
                                                                        /*}}}*/
 // TagFile::~pkgTagFile - Destructor                                   /*{{{*/
@@ -55,7 +56,7 @@ pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) : Fd(*pFd), Size(Size)
 /* */
 pkgTagFile::~pkgTagFile()
 {
-   delete [] Buffer;
+   delete Map;
 }
                                                                        /*}}}*/
 // TagFile::Step - Advance to the next section                         /*{{{*/
@@ -63,71 +64,18 @@ pkgTagFile::~pkgTagFile()
 /* If the Section Scanner fails we refill the buffer and try again. */
 bool pkgTagFile::Step(pkgTagSection &Tag)
 {
-   pkgTagSection::ScanFlags ret = Tag.Scan(Start,End - Start);
-   if (ret == pkgTagSection::ScanEOF) {
-      CurSize <<= 1;
-      if (Fill() == false)
-        return false;
-      do {
-          ret = Tag.Scan(Start,End - Start);
-          if (ret == pkgTagSection::ScanEOF) {
-             CurSize <<= 1;
-             if (Fill() == false)
-                break;
-          }
-      } while (ret == pkgTagSection::ScanEOF);
-   }
-   if (ret != pkgTagSection::ScanSuccess)
+   if (Start == End)
+      return false;
+
+   if (Tag.Scan(Start,End - Start) == false)
+   {
       return _error->Error(_("Unable to parse package file %s (1)"),
-                          Fd.Name().c_str());
+             Fd.Name().c_str());
+   }
    Start += Tag.size();
    iOffset += Tag.size();
 
    Tag.Trim();
-   return true;
-}
-                                                                       /*}}}*/
-// TagFile::Fill - Top up the buffer                                   /*{{{*/
-// ---------------------------------------------------------------------
-/* This takes the bit at the end of the buffer and puts it at the start
-   then fills the rest from the file */
-bool pkgTagFile::Fill()
-{
-   unsigned long EndSize = End - Start;
-   unsigned long Actual = 0;
-   
-   memmove(Buffer,Start,EndSize);
-   Start = Buffer;
-   End = Buffer + EndSize;
-   
-   if (Done == false)
-   {
-      // See if only a bit of the file is left
-      if (Fd.Read(End,Size - (End - Buffer),&Actual) == false)
-        return false;
-      if (Actual != Size - (End - Buffer))
-        Done = true;
-      End += Actual;
-   }
-   
-   if (Done == true)
-   {
-      if (EndSize <= 3 && Actual == 0)
-        return false;
-      if (Size - (End - Buffer) < 4)
-        return true;
-      
-      // Append a double new line if one does not exist
-      unsigned int LineCount = 0;
-      for (const char *E = End - 1; E - End < 6 && (*E == '\n' || *E == '\r'); E--)
-        if (*E == '\n')
-           LineCount++;
-      for (; LineCount < 2; LineCount++)
-        *End++ = '\n';
-      
-      return true;
-   }
-   
    return true;
 }
                                                                        /*}}}*/
@@ -148,29 +96,10 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset)
 
    // Reposition and reload..
    iOffset = Offset;
-   Done = false;
-   if (Fd.Seek(Offset) == false)
-      return false;
-   End = Start = Buffer;
+   Start = Buffer + iOffset;
    
-   if (Fill() == false)
-      return false;
-
-   pkgTagSection::ScanFlags ret = Tag.Scan(Start,End - Start);
-   if (ret == pkgTagSection::ScanEOF) {
-      CurSize <<= 1;
-      if (Fill() == false)
-        return false;
-      do {
-          ret = Tag.Scan(Start,End - Start);
-          if (ret == pkgTagSection::ScanEOF) {
-             CurSize <<= 1;
-             if (Fill() == false)
-                break;
-          }
-      } while (ret == pkgTagSection::ScanEOF);
-   }
-   if (ret != pkgTagSection::ScanSuccess)
+   // Start != End is a special case to not fail on empty TagFiles
+   if (Start != End && Tag.Scan(Start,End - Start) == false)
       return _error->Error(_("Unable to parse package file %s (2)"),Fd.Name().c_str());
    
    return true;
@@ -189,14 +118,14 @@ inline static unsigned long AlphaHash(const char *Text, const char *End = 0)
    return Res & 0xFF;
 }
 
-enum pkgTagSection::ScanFlags pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
+bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
 {
    const char *End = Start + MaxLength;
    Stop = Section = Start;
    memset(AlphaIndexes,0,sizeof(AlphaIndexes));
 
-   if (Stop == 0)
-      return ScanError;
+   if (Stop == 0 || MaxLength == 0)
+      return false;
    
    TagCount = 0;
    while (TagCount+1 < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End)
@@ -211,7 +140,7 @@ enum pkgTagSection::ScanFlags pkgTagSection::Scan(const char *Start,unsigned lon
       Stop = (const char *)memchr(Stop,'\n',End - Stop);
       
       if (Stop == 0)
-        return ScanEOF;
+        return false;
       
       for (; Stop+1 < End && Stop[1] == '\r'; Stop++);
 
@@ -220,13 +149,19 @@ enum pkgTagSection::ScanFlags pkgTagSection::Scan(const char *Start,unsigned lon
       {
         Indexes[TagCount] = Stop - Section;
         for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r'); Stop++);
-        return ScanSuccess;
+        return true;
       }
       
       Stop++;
    }
 
-   return ScanEOF;
+   if ((Stop+1 >= End) && (End[-1] == '\n' || End[-1] == '\r'))
+   {
+       Indexes[TagCount] = (End - 1) - Section;
+       return true;
+   }
+
+   return false;
 }
                                                                        /*}}}*/
 // TagSection::Trim - Trim off any trailing garbage                    /*{{{*/