* merged with apt--mvo

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

diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index faea00ec50fd3d36bf71f9ffb0ec679205623279..649c93aeede7100e449f34caef2c1a3c8a5da429 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 1.29 2001/04/22 05:42:52 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
@@ -23,12 +23,17 @@
     
 #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)
 {
    if (Fd.IsOpen() == false)
    {
@@ -54,24 +59,57 @@ pkgTagFile::~pkgTagFile()
    delete [] Buffer;
 }
                                                                        /*}}}*/
+// TagFile::Resize - Resize the internal buffer                                /*{{{*/
+// ---------------------------------------------------------------------
+/* Resize the internal buffer (double it in size). Fail if a maximum size
+ * size is reached.
+ */
+bool pkgTagFile::Resize()
+{
+   char *tmp;
+   unsigned long EndSize = End - Start;
+
+   // fail is the buffer grows too big
+   if(Size > 1024*1024+1)
+      return false;
+
+   // get new buffer and use it
+   tmp = new char[2*Size];
+   memcpy(tmp, Buffer, Size);
+   Size = Size*2;
+   delete [] Buffer;
+   Buffer = tmp;
+
+   // update the start/end pointers to the new buffer
+   Start = Buffer;
+   End = Start + EndSize;
+   return true;
+}
+
 // TagFile::Step - Advance to the next section                         /*{{{*/
 // ---------------------------------------------------------------------
-/* If the Section Scanner fails we refill the buffer and try again. */
+/* If the Section Scanner fails we refill the buffer and try again. 
+ * If that fails too, double the buffer size and try again until a
+ * maximum buffer is reached.
+ */
 bool pkgTagFile::Step(pkgTagSection &Tag)
 {
-   if (Tag.Scan(Start,End - Start) == false)
+   while (Tag.Scan(Start,End - Start) == false)
    {
       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());
-   }   
+      if(Tag.Scan(Start,End - Start))
+        break;
+
+      if (Resize() == false)
+        return _error->Error(_("Unable to parse package file %s (1)"),
+                                Fd.Name().c_str());
+   }
    Start += Tag.size();
    iOffset += Tag.size();
 
    Tag.Trim();
-   
    return true;
 }
                                                                        /*}}}*/
@@ -82,14 +120,25 @@ 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 (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;
@@ -105,31 +154,6 @@ bool pkgTagFile::Fill()
       return true;
    }
    
-   // See if only a bit of the file is left
-   unsigned long Actual;
-   if (Fd.Read(End,Size - (End - Buffer),&Actual) == false)
-      return false;
-   if (Actual != Size - (End - Buffer))
-      Done = true;
-   End += Actual;
-/*   
-   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;
 }
                                                                        /*}}}*/
@@ -175,12 +199,12 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long Offset)
 // ---------------------------------------------------------------------
 /* This looks for the first double new line in the data stream. It also
    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 */
+   last 8 letters gives very good performance on the debian package files */
 inline static unsigned long AlphaHash(const char *Text, const char *End = 0)
 {
    unsigned long Res = 0;
    for (; Text != End && *Text != ':' && *Text != 0; Text++)
-      Res = (unsigned long)(*Text) ^ (Res << 2);
+      Res = ((unsigned long)(*Text) & 0xDF) ^ (Res << 1);
    return Res & 0xFF;
 }
 
@@ -194,7 +218,7 @@ bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
       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)
@@ -208,13 +232,13 @@ 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;
       }
       
@@ -399,11 +423,13 @@ static const char *iTFRewritePackageOrder[] = {
                           "Recommends",
                           "Suggests",
                           "Conflicts",
+                          "Breaks",
                           "Conffiles",
                           "Filename",
                           "Size",
                           "MD5Sum",
-                          "SHA1Sum",
+                          "SHA1",
+                          "SHA256",
                            "MSDOS-Filename",   // Obsolete
                           "Description",
                           0};