Patchs for apt-cdrom

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

diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index 42a44453f256b98a103a0fa9164717566c1daeb3..a55d5214a86bd6356ee09dcca30f0b058172b9d6 100644 (file)
--- a/apt-pkg/tagfile.cc
+++ b/apt-pkg/tagfile.cc
@@ -1,11 +1,11 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
-// $Id: tagfile.cc,v 1.7 1998/07/12 23:58:39 jgg Exp $
+// $Id: tagfile.cc,v 1.15 1998/11/27 01:14:06 jgg Exp $
 /* ######################################################################
 
    Fast scanner for RFC-822 type header information
    
-   This uses a rotating 64K buffer to load the package information into.
+   This uses a rotating buffer to load the package information into.
    The scanner runs over it and isolates and indexes a single section.
    
    ##################################################################### */
@@ -17,7 +17,6 @@
 
 #include <apt-pkg/tagfile.h>
 #include <apt-pkg/error.h>
-#include <apt-pkg/init.h>
 
 #include <string>
 #include <stdio.h>
@@ -26,10 +25,10 @@
 // TagFile::pkgTagFile - Constructor                                   /*{{{*/
 // ---------------------------------------------------------------------
 /* */
-pkgTagFile::pkgTagFile(File &Fd) : Fd(Fd)
+pkgTagFile::pkgTagFile(FileFd &Fd,unsigned long Size) : Fd(Fd), Size(Size)
 {
-   Buffer = new char[64*1024];
-   Start = End = Buffer + 64*1024;
+   Buffer = new char[Size];
+   Start = End = Buffer;
    Left = Fd.Size();
    iOffset = 0;
    Fill();
@@ -60,35 +59,59 @@ bool pkgTagFile::Step(pkgTagSection &Tag)
    then fills the rest from the file */
 bool pkgTagFile::Fill()
 {
-   unsigned long Size = End - Start;
+   unsigned long EndSize = End - Start;
    
    if (Left == 0)
    {
-      if (Size <= 1)
+      if (EndSize <= 1)
         return false;
       return true;
    }
    
-   memmove(Buffer,Start,Size);
+   memmove(Buffer,Start,EndSize);
    Start = Buffer;
+   End = Buffer + EndSize;
    
-   // See if only a bit of the file is left or if 
-   if (Left < End - Buffer - Size)
+   // See if only a bit of the file is left
+   if (Left < Size - (End - Buffer))
    {
-      if (Fd.Read(Buffer + Size,Left) == false)
+      if (Fd.Read(End,Left) == false)
         return false;
-      End = Buffer + Size + Left;
+      
+      End += Left;
       Left = 0;
    }
    else
    {
-      if (Fd.Read(Buffer + Size, End - Buffer - Size) == false)
+      if (Fd.Read(End,Size - (End - Buffer)) == false)
         return false;
-      Left -= End - Buffer - Size;
+      
+      Left -= Size - (End - Buffer);
+      End = Buffer + Size;
    }   
    return true;
 }
                                                                        /*}}}*/
+// TagFile::Jump - Jump to a pre-recorded location in the file         /*{{{*/
+// ---------------------------------------------------------------------
+/* This jumps to a pre-recorded file location and reads the record
+   that is there */
+bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset)
+{
+   iOffset = Offset;
+   Left = Fd.Size() - Offset;
+   if (Fd.Seek(Offset) == false)
+      return false;
+   End = Start = Buffer;
+   
+   if (Fill() == false)
+      return false;
+   
+   if (Tag.Scan(Start,End - Start) == false)
+      return _error->Error("Unable to parse package file");
+   return true;
+}
+                                                                       /*}}}*/
 // TagSection::Scan - Scan for the end of the header information       /*{{{*/
 // ---------------------------------------------------------------------
 /* This looks for the first double new line in the data stream. It also
@@ -105,13 +128,16 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
    {
       if (Stop[-1] != '\n')
         continue;
+
+      // Skip line feeds
+      for (; Stop[0] == '\r' && Stop < End; Stop++);
+      
       if (Stop[0] == '\n')
       {
         // Extra one at the end to simplify find
         Indexes[TagCount] = Stop - Section;
-        for (; Stop[0] == '\n' && Stop < End; Stop++);
+        for (; (Stop[0] == '\n' || Stop[0] == '\r') && Stop < End; Stop++);
         return true;
-        break;
       }
       
       if (isspace(Stop[0]) == 0)
@@ -147,9 +173,35 @@ bool pkgTagSection::Find(const char *Tag,const char *&Start,
       End = Section + Indexes[I+1];
       for (; (isspace(*Start) != 0 || *Start == ':') && Start < End; Start++);
       for (; isspace(End[-1]) != 0 && End > Start; End--);
+      
       return true;
    }
    Start = End = 0;
    return false;
 }
                                                                        /*}}}*/
+// pkgTagSection::FindS - Find a string                                        /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+string pkgTagSection::FindS(const char *Tag)
+{
+   const char *Start;
+   const char *End;
+   if (Find(Tag,Start,End) == false)
+      return string();
+   return string(Start,End);      
+}
+                                                                       /*}}}*/
+// TagSection::FindI - Find an integer                                 /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+unsigned int pkgTagSection::FindI(const char *Tag)
+{
+   const char *Start;
+   const char *End;
+   if (Find(Tag,Start,End) == false)
+      return 0;
+   
+   return atoi(string(Start,End).c_str());
+}
+                                                                       /*}}}*/