X-Git-Url: https://git.saurik.com/apt.git/blobdiff_plain/f5ec3b68c582138acce7c5a93e473dde50ab8354..6ea086805714e0dbeecfb5e3e26d3489a624bcd4:/apt-pkg/tagfile.cc

diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index d58409bfb..8fcbeb23b 100644
--- a/apt-pkg/tagfile.cc
+++ b/apt-pkg/tagfile.cc
@@ -1,6 +1,6 @@
 // -*- mode: cpp; mode: fold -*-
 // Description								/*{{{*/
-// $Id: tagfile.cc,v 1.33 2002/05/30 04:19:48 jgg 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
@@ -31,22 +31,35 @@ 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),
+     Map(NULL),
+     Buffer(0)
 {
    if (Fd.IsOpen() == false)
    {
-      Buffer = 0;
       Start = End = Buffer = 0;
       Done = true;
       iOffset = 0;
+      Map = NULL;
       return;
    }
    
-   Buffer = new char[Size];
-   Start = End = Buffer;
-   Done = false;
+   // 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 ();
+   }
    iOffset = 0;
-   Fill();
 }
 									/*}}}*/
 // TagFile::~pkgTagFile - Destructor					/*{{{*/
@@ -54,7 +67,8 @@ pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long Size) : Fd(*pFd), Size(Size)
 /* */
 pkgTagFile::~pkgTagFile()
 {
-   delete [] Buffer;
+   if(!Map) delete [] Buffer;
+   delete Map;
 }
 									/*}}}*/
 // TagFile::Step - Advance to the next section				/*{{{*/
@@ -62,15 +76,22 @@ 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;
       
       if (Tag.Scan(Start,End - Start) == false)
 	 return _error->Error(_("Unable to parse package file %s (1)"),
 			      Fd.Name().c_str());
-   }   
+   }
    Start += Tag.size();
    iOffset += Tag.size();
 
@@ -85,7 +106,7 @@ bool pkgTagFile::Step(pkgTagSection &Tag)
 bool pkgTagFile::Fill()
 {
    unsigned long EndSize = End - Start;
-   unsigned long Actual;
+   unsigned long Actual = 0;
    
    memmove(Buffer,Start,EndSize);
    Start = Buffer;
@@ -137,23 +158,30 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset)
       return Step(Tag);
    }
 
-   // Reposition and reload..
    iOffset = Offset;
-   Done = false;
-   if (Fd.Seek(Offset) == false)
-      return false;
-   End = Start = Buffer;
+   if (Map != NULL)
+   {
+      Start = Buffer + iOffset;
+   } 
+   else 
+   {
+      // Reposition and reload..
+      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;
-   
-   // This appends a double new line (for the real eof handling)
-   if (Fill() == false)
-      return false;
+      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;
+   }
+
    if (Tag.Scan(Start,End - Start) == false)
       return _error->Error(_("Unable to parse package file %s (2)"),Fd.Name().c_str());
    
@@ -179,7 +207,7 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
    Stop = Section = Start;
    memset(AlphaIndexes,0,sizeof(AlphaIndexes));
 
-   if (Stop == 0)
+   if (Stop == 0 || MaxLength == 0)
       return false;
    
    TagCount = 0;
@@ -197,7 +225,7 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
       if (Stop == 0)
 	 return false;
       
-      for (;  Stop+1 < End && Stop[1] == '\r'; Stop++);
+      for (; Stop+1 < End && Stop[1] == '\r'; Stop++);
 
       // Double newline marks the end of the record
       if (Stop+1 < End && Stop[1] == '\n')
@@ -210,6 +238,12 @@ 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;
 }
 									/*}}}*/
@@ -392,7 +426,8 @@ static const char *iTFRewritePackageOrder[] = {
                           "Filename",
                           "Size",
                           "MD5Sum",
-                          "SHA1Sum",
+                          "SHA1",
+                          "SHA256",
                            "MSDOS-Filename",   // Obsolete
                           "Description",
                           0};