* apt-pkg/depcache.cc:

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

diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index 5d11446299fb29b17d9f14f4624d6407443a004c..8fcbeb23b6fb39ee1ab3deab4f268fece42029f5 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 1.26 2001/02/20 07:03:17 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
@@ -23,19 +23,43 @@
     
 #include <string>
 #include <stdio.h>
+#include <ctype.h>
                                                                        /*}}}*/
 
+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)
 {
-   Buffer = new char[Size];
-   Start = End = Buffer;
-   Left = Fd.Size();
-   TotalSize = Fd.Size();
+   if (Fd.IsOpen() == false)
+   {
+      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 ();
+   }
    iOffset = 0;
-   Fill();
 }
                                                                        /*}}}*/
 // TagFile::~pkgTagFile - Destructor                                   /*{{{*/
@@ -43,7 +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                         /*{{{*/
@@ -51,19 +76,26 @@ 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());
-   }   
+        return _error->Error(_("Unable to parse package file %s (1)"),
+                             Fd.Name().c_str());
+   }
    Start += Tag.size();
    iOffset += Tag.size();
 
    Tag.Trim();
-   
    return true;
 }
                                                                        /*}}}*/
@@ -74,14 +106,25 @@ bool pkgTagFile::Step(pkgTagSection &Tag)
 bool pkgTagFile::Fill()
 {
    unsigned long EndSize = End - Start;
+   unsigned long Actual = 0;
    
    memmove(Buffer,Start,EndSize);
    Start = Buffer;
    End = Buffer + EndSize;
    
-   if (Left == 0)
+   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)
+      if (EndSize <= 3 && Actual == 0)
         return false;
       if (Size - (End - Buffer) < 4)
         return true;
@@ -97,23 +140,6 @@ bool pkgTagFile::Fill()
       return true;
    }
    
-   // See if only a bit of the file is left
-   if (Left < Size - (End - Buffer))
-   {
-      if (Fd.Read(End,Left) == false)
-        return false;
-      
-      End += Left;
-      Left = 0;
-   }
-   else
-   {
-      if (Fd.Read(End,Size - (End - Buffer)) == false)
-        return false;
-      
-      Left -= Size - (End - Buffer);
-      End = Buffer + Size;
-   }   
    return true;
 }
                                                                        /*}}}*/
@@ -132,23 +158,30 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset)
       return Step(Tag);
    }
 
-   // Reposition and reload..
    iOffset = Offset;
-   Left = TotalSize - Offset;
-   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());
    
@@ -174,11 +207,11 @@ 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;
-   while (TagCount < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End)
+   while (TagCount+1 < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End)
    {
       // Start a new index and add it to the hash
       if (isspace(Stop[0]) == 0)
@@ -192,19 +225,25 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
       if (Stop == 0)
         return false;
       
-      for (; Stop[1] == '\r' && Stop+1 < End; Stop++);
+      for (; Stop+1 < End && Stop[1] == '\r'; Stop++);
 
       // Double newline marks the end of the record
       if (Stop+1 < End && Stop[1] == '\n')
       {
         Indexes[TagCount] = Stop - Section;
-        for (; (Stop[0] == '\n' || Stop[0] == '\r') && Stop < End; Stop++);
+        for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r'); Stop++);
         return true;
       }
       
       Stop++;
    }
 
+   if ((Stop+1 >= End) && (End[-1] == '\n' || End[-1] == '\r'))
+   {
+      Indexes[TagCount] = (End - 1) - Section;
+      return true;
+   }
+
    return false;
 }
                                                                        /*}}}*/
@@ -387,6 +426,8 @@ static const char *iTFRewritePackageOrder[] = {
                           "Filename",
                           "Size",
                           "MD5Sum",
+                          "SHA1",
+                          "SHA256",
                            "MSDOS-Filename",   // Obsolete
                           "Description",
                           0};