Multiple different versions support

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

diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index 106b0febeb29ddd5a9a7d9b840ccc22e1483b502..53e1e5e8bfc29b469bbb55c87a8dcb3f6f66e756 100644 (file)
--- a/apt-pkg/tagfile.cc
+++ b/apt-pkg/tagfile.cc
@@ -1,18 +1,23 @@
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/
 // -*- mode: cpp; mode: fold -*-
 // Description                                                         /*{{{*/

-// $Id: tagfile.cc,v 1.1 1998/07/02 02:58:13 jgg Exp $
+// $Id: tagfile.cc,v 1.24 1999/02/22 03:30:06 jgg Exp $

 /* ######################################################################
 
    Fast scanner for RFC-822 type header information
    
 /* ######################################################################
 
    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.
    
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/
    The scanner runs over it and isolates and indexes a single section.
    
    ##################################################################### */
                                                                        /*}}}*/
 // Include Files                                                       /*{{{*/

-#include <pkglib/tagfile.h>
-#include <pkglib/error.h>
+#ifdef __GNUG__
+#pragma implementation "apt-pkg/tagfile.h"
+#endif
+
+#include <apt-pkg/tagfile.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/strutl.h>

 
 #include <string>
 #include <stdio.h>
 
 #include <string>
 #include <stdio.h>


@@ -21,11 +26,12 @@
 // TagFile::pkgTagFile - Constructor                                   /*{{{*/
 // ---------------------------------------------------------------------
 /* */
 // 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();
    Left = Fd.Size();

+   iOffset = 0;

    Fill();
 }
                                                                        /*}}}*/
    Fill();
 }
                                                                        /*}}}*/


@@ -40,9 +46,11 @@ bool pkgTagFile::Step(pkgTagSection &Tag)
         return false;
       
       if (Tag.Scan(Start,End - Start) == false)
         return false;
       
       if (Tag.Scan(Start,End - Start) == false)

-        return _error->Error("Unable to parse package file");
+        return _error->Error("Unable to parse package file %s (1)",Fd.Name().c_str());

    }   
    }   

-   Start += Tag.Length();
+   Start += Tag.size();
+   iOffset += Tag.size();
+   

    return true;
 }
                                                                        /*}}}*/
    return true;
 }
                                                                        /*}}}*/


@@ -52,67 +60,126 @@ bool pkgTagFile::Step(pkgTagSection &Tag)
    then fills the rest from the file */
 bool pkgTagFile::Fill()
 {
    then fills the rest from the file */
 bool pkgTagFile::Fill()
 {

-   unsigned long Size = End - Start;
+   unsigned long EndSize = End - Start;
+   
+   memmove(Buffer,Start,EndSize);
+   Start = Buffer;
+   End = Buffer + EndSize;

    
    if (Left == 0)
    {
    
    if (Left == 0)
    {

-      if (Size <= 1)
+      if (EndSize <= 3)

         return false;
         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;
    }
    

-   memmove(Buffer,Start,Size);
-   Start = Buffer;
-   
-   // 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;
         return false;

-      End = Buffer + Size + Left;
+      
+      End += Left;

       Left = 0;
    }
    else
    {
       Left = 0;
    }
    else
    {

-      if (Fd.Read(Buffer + Size, End - Buffer - Size) == false)
+      if (Fd.Read(End,Size - (End - Buffer)) == false)

         return 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) == 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)
+   {
+      cout << string(Start,End) << endl;
+      return _error->Error("Unable to parse package file %s (2)",Fd.Name().c_str());
+   }
+   

    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
    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

-   indexes the tags in the section. */
+   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 */

 bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
 {
    const char *End = Start + MaxLength;
    Stop = Section = Start;
 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 false;

    
    TagCount = 0;
    
    TagCount = 0;

-   Indexes[TagCount++] = Stop - Section;
-   Stop++;
-   for (; Stop < End; Stop++)
+   while (TagCount < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End)

    {
    {

-      if (Stop[-1] != '\n')
-        continue;
-      if (Stop[0] == '\n')
+      // Start a new index and add it to the hash
+      if (isspace(Stop[0]) == 0)
+      {
+        Indexes[TagCount++] = Stop - Section;
+        unsigned char A = tolower(Stop[0]) - 'a';
+        unsigned char B = tolower(Stop[1]) - 'a';
+        unsigned char C = tolower(Stop[3]) - 'a';
+        AlphaIndexes[((A + C/3)%26) + 26*((B + C/2)%26)] = TagCount;
+      }
+
+      Stop = (const char *)memchr(Stop,'\n',End - Stop);
+      
+      if (Stop == 0)
+        return false;
+      
+      for (; Stop[1] == '\r' && Stop+1 < End; Stop++);
+
+      // Double newline marks the end of the record
+      if (Stop+1 < End && Stop[1] == '\n')

       {
       {

-        // Extra one at the end to simplify find

         Indexes[TagCount] = Stop - Section;
         Indexes[TagCount] = Stop - Section;

-        for (; Stop[0] == '\n' && Stop < End; Stop++);
+        for (; (Stop[0] == '\n' || Stop[0] == '\r') && Stop < End; Stop++);

         return true;
         return true;

-        break;

       }
       
       }
       

-      if (isspace(Stop[0]) == 0)
-        Indexes[TagCount++] = Stop - Section;
-      
-      // Just in case.
-      if (TagCount > sizeof(Indexes)/sizeof(Indexes[0]))
-        TagCount = sizeof(Indexes)/sizeof(Indexes[0]);
-   }   
+      Stop++;
+   }
+

    return false;
 }
                                                                        /*}}}*/
    return false;
 }
                                                                        /*}}}*/


@@ -123,13 +190,24 @@ bool pkgTagSection::Find(const char *Tag,const char *&Start,
                         const char *&End)
 {
    unsigned int Length = strlen(Tag);
                         const char *&End)
 {
    unsigned int Length = strlen(Tag);

-   for (unsigned int I = 0; I != TagCount; I++)
+   unsigned char A = tolower(Tag[0]) - 'a';
+   unsigned char B = tolower(Tag[1]) - 'a';
+   unsigned char C = tolower(Tag[3]) - 'a';
+   unsigned int I = AlphaIndexes[((A + C/3)%26) + 26*((B + C/2)%26)];
+   if (I == 0)
+      return false;
+   I--;
+   
+   for (unsigned int Counter = 0; Counter != TagCount; Counter++, 
+       I = (I+1)%TagCount)

    {
    {

-      if (strncasecmp(Tag,Section + Indexes[I],Length) != 0)
+      const char *St;
+      St = Section + Indexes[I];
+      if (strncasecmp(Tag,St,Length) != 0)

         continue;
 
       // Make sure the colon is in the right place
         continue;
 
       // Make sure the colon is in the right place

-      const char *C = Section + Length + Indexes[I];
+      const char *C = St + Length;

       for (; isspace(*C) != 0; C++);
       if (*C != ':')
         continue;
       for (; isspace(*C) != 0; C++);
       if (*C != ':')
         continue;


@@ -137,59 +215,80 @@ bool pkgTagSection::Find(const char *Tag,const char *&Start,
       // Strip off the gunk from the start end
       Start = C;
       End = Section + Indexes[I+1];
       // Strip off the gunk from the start end
       Start = C;
       End = Section + Indexes[I+1];

+      if (Start >= End)
+        return _error->Error("Internal parsing error");
+      

       for (; (isspace(*Start) != 0 || *Start == ':') && Start < End; Start++);
       for (; isspace(End[-1]) != 0 && End > Start; End--);
       for (; (isspace(*Start) != 0 || *Start == ':') && Start < End; Start++);
       for (; isspace(End[-1]) != 0 && End > Start; End--);

+      

       return true;
    }
       return true;
    }

+   

    Start = End = 0;
    return false;
 }
                                                                        /*}}}*/
    Start = End = 0;
    return false;
 }
                                                                        /*}}}*/

+// TagSection::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                                 /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+signed int pkgTagSection::FindI(const char *Tag,signed long Default)
+{
+   const char *Start;
+   const char *Stop;
+   if (Find(Tag,Start,Stop) == false)
+      return Default;

 
 

-#include <pkglib/pkgcachegen.h>
-
-int main(int argc,char *argv[])
+   // Copy it into a temp buffer so we can use strtol
+   char S[300];
+   if ((unsigned)(Stop - Start) >= sizeof(S))
+      return Default;
+   strncpy(S,Start,Stop-Start);
+   S[Stop - Start] = 0;
+   
+   char *End;
+   signed long Result = strtol(S,&End,10);
+   if (S == End)
+      return Default;
+   return Result;
+}
+                                                                       /*}}}*/
+// TagSection::FindFlag - Locate a yes/no type flag                    /*{{{*/
+// ---------------------------------------------------------------------
+/* The bits marked in Flag are masked on/off in Flags */
+bool pkgTagSection::FindFlag(const char *Tag,unsigned long &Flags,
+                            unsigned long Flag)

 {
 {

-   {
-      File F(argv[1],File::ReadOnly);
-      pkgTagFile Test(F);
-      File CacheF("./cache",File::WriteEmpty);
-      DynamicMMap Map(CacheF,MMap::Public);
-      pkgCacheGenerator Gen(Map);
-      Gen.SelectFile("tet");
-   }
+   const char *Start;
+   const char *Stop;
+   if (Find(Tag,Start,Stop) == false)
+      return true;
+   
+   switch (StringToBool(string(Start,Stop)))
+   {     
+      case 0:
+      Flags &= ~Flag;
+      return true;

 
 

-#if 0 
-   pkgTagSection I;
-   while (Test.Step(I) == true)
-   {
-      const char *Start;
-      const char *End;
-      if (I.Find("Package",Start,End) == false)
-      {
-        cout << "Failed" << endl;
-        continue;
-      }
-      
-      cout << "Package: " << string(Start,End - Start) << endl;
-      
-/*      for (const char *I = Start; I < End; I++)
-      {
-        const char *Begin = I;
-        bool Number = true;
-        while (isspace(*I) == 0 && ispunct(*I) == 0 && I < End)
-        {
-           if (isalpha(*I) != 0)
-              Number = false;
-           I++;
-        }
-        if (Number == false)
-           cout << string(Begin,I-Begin) << endl;       
-        while ((isspace(*I) != 0 || ispunct(*I) != 0) && I < End)
-           I++;
-        I--;
-      }      */
+      case 1:
+      Flags |= Flag;
+      return true;
+
+      default:
+      _error->Warning("Unknown flag value");
+      return true;

    }
    }

-#endif   
-   _error->DumpErrors();
+   return true;

 }
 }

+                                                                       /*}}}*/