deal with configured build-essential first

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

diff --git a/apt-pkg/tagfile.cc b/apt-pkg/tagfile.cc
index b91e868e2a6c9f6169038dc336bcc517efe84a23..8acecd735f9da90642a3f2a29e0b3766c5295f97 100644 (file)
--- a/apt-pkg/tagfile.cc
+++ b/apt-pkg/tagfile.cc
@@ -21,6 +21,8 @@
 #include <string>
 #include <stdio.h>
 #include <ctype.h>
 #include <string>
 #include <stdio.h>
 #include <ctype.h>

+#include <stdlib.h>
+#include <string.h>

 
 #include <apti18n.h>
                                                                        /*}}}*/
 
 #include <apti18n.h>
                                                                        /*}}}*/


@@ -30,34 +32,89 @@ using std::string;
 class pkgTagFilePrivate
 {
 public:
 class pkgTagFilePrivate
 {
 public:

-   pkgTagFilePrivate(FileFd *pFd, unsigned long long Size) : Fd(*pFd), Buffer(NULL),
-                                                            Start(NULL), End(NULL),
-                                                            Done(false), iOffset(0),
-                                                            Size(Size)
+   void Reset(FileFd * const pFd, unsigned long long const pSize)

    {
    {

+      if (Buffer != NULL)
+        free(Buffer);
+      Buffer = NULL;
+      Fd = pFd;
+      Start = NULL;
+      End = NULL;
+      Done = false;
+      iOffset = 0;
+      Size = pSize;

    }
    }

-   FileFd &Fd;
+
+   pkgTagFilePrivate(FileFd * const pFd, unsigned long long const Size) : Buffer(NULL)
+   {
+      Reset(pFd, Size);
+   }
+   FileFd * Fd;

    char *Buffer;
    char *Start;
    char *End;
    bool Done;
    unsigned long long iOffset;
    unsigned long long Size;
    char *Buffer;
    char *Start;
    char *End;
    bool Done;
    unsigned long long iOffset;
    unsigned long long Size;

+
+   ~pkgTagFilePrivate()
+   {
+      if (Buffer != NULL)
+        free(Buffer);
+   }

 };
 
 };
 

+class pkgTagSectionPrivate
+{
+public:
+   pkgTagSectionPrivate()
+   {
+   }
+   struct TagData {
+      unsigned int StartTag;
+      unsigned int EndTag;
+      unsigned int StartValue;
+      unsigned int NextInBucket;
+
+      explicit TagData(unsigned int const StartTag) : StartTag(StartTag), EndTag(0), StartValue(0), NextInBucket(0) {}
+   };
+   std::vector<TagData> Tags;
+};
+
+static unsigned long AlphaHash(const char *Text, size_t Length)                /*{{{*/
+{
+   /* This very simple hash function for the last 8 letters gives
+      very good performance on the debian package files */
+   if (Length > 8)
+   {
+    Text += (Length - 8);
+    Length = 8;
+   }
+   unsigned long Res = 0;
+   for (size_t i = 0; i < Length; ++i)
+      Res = ((unsigned long)(Text[i]) & 0xDF) ^ (Res << 1);
+   return Res & 0xFF;
+}
+                                                                       /*}}}*/
+

 // TagFile::pkgTagFile - Constructor                                   /*{{{*/
 // ---------------------------------------------------------------------
 /* */
 // TagFile::pkgTagFile - Constructor                                   /*{{{*/
 // ---------------------------------------------------------------------
 /* */

-pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long long Size)
+pkgTagFile::pkgTagFile(FileFd * const pFd,unsigned long long const Size)
+   : d(new pkgTagFilePrivate(pFd, Size + 4))
+{
+   Init(pFd, Size);
+}
+void pkgTagFile::Init(FileFd * const pFd,unsigned long long Size)

 {
    /* The size is increased by 4 because if we start with the Size of the
       filename we need to try to read 1 char more to see an EOF faster, 1
       char the end-pointer can be on and maybe 2 newlines need to be added
       to the end of the file -> 4 extra chars */
    Size += 4;
 {
    /* The size is increased by 4 because if we start with the Size of the
       filename we need to try to read 1 char more to see an EOF faster, 1
       char the end-pointer can be on and maybe 2 newlines need to be added
       to the end of the file -> 4 extra chars */
    Size += 4;

-   d = new pkgTagFilePrivate(pFd, Size);
+   d->Reset(pFd, Size);

 
 

-   if (d->Fd.IsOpen() == false)
+   if (d->Fd->IsOpen() == false)

       d->Start = d->End = d->Buffer = 0;
    else
       d->Buffer = (char*)malloc(sizeof(char) * Size);
       d->Start = d->End = d->Buffer = 0;
    else
       d->Buffer = (char*)malloc(sizeof(char) * Size);


@@ -78,12 +135,11 @@ pkgTagFile::pkgTagFile(FileFd *pFd,unsigned long long Size)
 /* */
 pkgTagFile::~pkgTagFile()
 {
 /* */
 pkgTagFile::~pkgTagFile()
 {

-   free(d->Buffer);

    delete d;
 }
                                                                        /*}}}*/
 // TagFile::Offset - Return the current offset in the buffer           /*{{{*/
    delete d;
 }
                                                                        /*}}}*/
 // TagFile::Offset - Return the current offset in the buffer           /*{{{*/

-unsigned long pkgTagFile::Offset()
+APT_PURE unsigned long pkgTagFile::Offset()

 {
    return d->iOffset;
 }
 {
    return d->iOffset;
 }


@@ -126,18 +182,23 @@ bool pkgTagFile::Resize(unsigned long long const newSize)
  */
 bool pkgTagFile::Step(pkgTagSection &Tag)
 {
  */
 bool pkgTagFile::Step(pkgTagSection &Tag)
 {

-   while (Tag.Scan(d->Start,d->End - d->Start) == false)
+   if(Tag.Scan(d->Start,d->End - d->Start) == false)

    {
    {

-      if (Fill() == false)
-        return false;
-      
-      if(Tag.Scan(d->Start,d->End - d->Start))
-        break;
+      do
+      {
+        if (Fill() == false)
+           return false;
+
+        if(Tag.Scan(d->Start,d->End - d->Start, false))
+           break;
+
+        if (Resize() == false)
+           return _error->Error(_("Unable to parse package file %s (%d)"),
+                 d->Fd->Name().c_str(), 1);

 
 

-      if (Resize() == false)
-        return _error->Error(_("Unable to parse package file %s (1)"),
-                              d->Fd.Name().c_str());
+      } while (Tag.Scan(d->Start,d->End - d->Start, false) == false);

    }
    }

+

    d->Start += Tag.size();
    d->iOffset += Tag.size();
 
    d->Start += Tag.size();
    d->iOffset += Tag.size();
 


@@ -162,9 +223,9 @@ bool pkgTagFile::Fill()
    {
       // See if only a bit of the file is left
       unsigned long long const dataSize = d->Size - ((d->End - d->Buffer) + 1);
    {
       // See if only a bit of the file is left
       unsigned long long const dataSize = d->Size - ((d->End - d->Buffer) + 1);

-      if (d->Fd.Read(d->End, dataSize, &Actual) == false)
+      if (d->Fd->Read(d->End, dataSize, &Actual) == false)

         return false;
         return false;

-      if (Actual != dataSize || d->Fd.Eof() == true)
+      if (Actual != dataSize)

         d->Done = true;
       d->End += Actual;
    }
         d->Done = true;
       d->End += Actual;
    }


@@ -207,13 +268,17 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long long Offset)
       unsigned long long Dist = Offset - d->iOffset;
       d->Start += Dist;
       d->iOffset += Dist;
       unsigned long long Dist = Offset - d->iOffset;
       d->Start += Dist;
       d->iOffset += Dist;

-      return Step(Tag);
+      // if we have seen the end, don't ask for more
+      if (d->Done == true)
+        return Tag.Scan(d->Start, d->End - d->Start);
+      else
+        return Step(Tag);

    }
 
    // Reposition and reload..
    d->iOffset = Offset;
    d->Done = false;
    }
 
    // Reposition and reload..
    d->iOffset = Offset;
    d->Done = false;

-   if (d->Fd.Seek(Offset) == false)
+   if (d->Fd->Seek(Offset) == false)

       return false;
    d->End = d->Start = d->Buffer;
    
       return false;
    d->End = d->Start = d->Buffer;
    


@@ -227,8 +292,8 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long long Offset)
    if (Fill() == false)
       return false;
    
    if (Fill() == false)
       return false;
    

-   if (Tag.Scan(d->Start, d->End - d->Start) == false)
-      return _error->Error(_("Unable to parse package file %s (2)"),d->Fd.Name().c_str());
+   if (Tag.Scan(d->Start, d->End - d->Start, false) == false)
+      return _error->Error(_("Unable to parse package file %s (%d)"),d->Fd->Name().c_str(), 2);

    
    return true;
 }
    
    return true;
 }


@@ -236,49 +301,115 @@ bool pkgTagFile::Jump(pkgTagSection &Tag,unsigned long long Offset)
 // pkgTagSection::pkgTagSection - Constructor                          /*{{{*/
 // ---------------------------------------------------------------------
 /* */
 // pkgTagSection::pkgTagSection - Constructor                          /*{{{*/
 // ---------------------------------------------------------------------
 /* */

+APT_IGNORE_DEPRECATED_PUSH

 pkgTagSection::pkgTagSection()
 pkgTagSection::pkgTagSection()

-   : Section(0), TagCount(0), d(NULL), Stop(0)
+   : Section(0), d(new pkgTagSectionPrivate()), Stop(0)

 {
 {

-   memset(&Indexes, 0, sizeof(Indexes));

    memset(&AlphaIndexes, 0, sizeof(AlphaIndexes));
 }
    memset(&AlphaIndexes, 0, sizeof(AlphaIndexes));
 }

+APT_IGNORE_DEPRECATED_POP

                                                                        /*}}}*/
 // TagSection::Scan - Scan for the end of the header information       /*{{{*/
                                                                        /*}}}*/
 // 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. */
-bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength)
+bool pkgTagSection::Scan(const char *Start,unsigned long MaxLength, bool const Restart)

 {
 {

+   Section = Start;

    const char *End = Start + MaxLength;
    const char *End = Start + MaxLength;

-   Stop = Section = Start;
-   memset(AlphaIndexes,0,sizeof(AlphaIndexes));
+
+   if (Restart == false && d->Tags.empty() == false)
+   {
+      Stop = Section + d->Tags.back().StartTag;
+      if (End <= Stop)
+        return false;
+      Stop = (const char *)memchr(Stop,'\n',End - Stop);
+      if (Stop == NULL)
+        return false;
+      ++Stop;
+   }
+   else
+   {
+      Stop = Section;
+      if (d->Tags.empty() == false)
+      {
+        memset(&AlphaIndexes, 0, sizeof(AlphaIndexes));
+        d->Tags.clear();
+      }
+      d->Tags.reserve(0x100);
+   }
+   unsigned int TagCount = d->Tags.size();

 
    if (Stop == 0)
       return false;
 
 
    if (Stop == 0)
       return false;
 

-   TagCount = 0;
-   while (TagCount+1 < sizeof(Indexes)/sizeof(Indexes[0]) && Stop < End)
+   pkgTagSectionPrivate::TagData lastTagData(0);
+   lastTagData.EndTag = 0;
+   unsigned long lastTagHash = 0;
+   while (Stop < End)

    {
    {

-       TrimRecord(true,End);
+      TrimRecord(true,End);
+
+      // this can happen when TrimRecord trims away the entire Record
+      // (e.g. because it just contains comments)
+      if(Stop == End)
+         return true;

 
       // Start a new index and add it to the hash
       if (isspace(Stop[0]) == 0)
       {
 
       // Start a new index and add it to the hash
       if (isspace(Stop[0]) == 0)
       {

-        Indexes[TagCount++] = Stop - Section;
-        AlphaIndexes[AlphaHash(Stop,End)] = TagCount;
+        // store the last found tag
+        if (lastTagData.EndTag != 0)
+        {
+           if (AlphaIndexes[lastTagHash] != 0)
+              lastTagData.NextInBucket = AlphaIndexes[lastTagHash];
+           APT_IGNORE_DEPRECATED_PUSH
+           AlphaIndexes[lastTagHash] = TagCount;
+           APT_IGNORE_DEPRECATED_POP
+           d->Tags.push_back(lastTagData);
+        }
+
+        APT_IGNORE_DEPRECATED(++TagCount;)
+        lastTagData = pkgTagSectionPrivate::TagData(Stop - Section);
+        // find the colon separating tag and value
+        char const * Colon = (char const *) memchr(Stop, ':', End - Stop);
+        if (Colon == NULL)
+           return false;
+        // find the end of the tag (which might or might not be the colon)
+        char const * EndTag = Colon;
+        --EndTag;
+        for (; EndTag > Stop && isspace(*EndTag) != 0; --EndTag)
+           ;
+        ++EndTag;
+        lastTagData.EndTag = EndTag - Section;
+        lastTagHash = AlphaHash(Stop, EndTag - Stop);
+        // find the beginning of the value
+        Stop = Colon + 1;
+        for (; isspace(*Stop) != 0; ++Stop);
+        if (Stop >= End)
+           return false;
+        lastTagData.StartValue = Stop - Section;

       }
 
       Stop = (const char *)memchr(Stop,'\n',End - Stop);
       }
 
       Stop = (const char *)memchr(Stop,'\n',End - Stop);

-      
+

       if (Stop == 0)
         return false;
 
       if (Stop == 0)
         return false;
 

-      for (; Stop+1 < End && Stop[1] == '\r'; Stop++);
+      for (; Stop+1 < End && Stop[1] == '\r'; Stop++)
+         /* nothing */
+         ;

 
       // Double newline marks the end of the record
       if (Stop+1 < End && Stop[1] == '\n')
       {
 
       // Double newline marks the end of the record
       if (Stop+1 < End && Stop[1] == '\n')
       {

-        Indexes[TagCount] = Stop - Section;
+        if (lastTagData.EndTag != 0)
+        {
+           if (AlphaIndexes[lastTagHash] != 0)
+              lastTagData.NextInBucket = AlphaIndexes[lastTagHash];
+           APT_IGNORE_DEPRECATED(AlphaIndexes[lastTagHash] = TagCount;)
+           d->Tags.push_back(lastTagData);
+        }
+
+        pkgTagSectionPrivate::TagData const td(Stop - Section);
+        d->Tags.push_back(td);

         TrimRecord(false,End);
         return true;
       }
         TrimRecord(false,End);
         return true;
       }


@@ -307,8 +438,8 @@ void pkgTagSection::Trim()
    for (; Stop > Section + 2 && (Stop[-2] == '\n' || Stop[-2] == '\r'); Stop--);
 }
                                                                        /*}}}*/
    for (; Stop > Section + 2 && (Stop[-2] == '\n' || Stop[-2] == '\r'); Stop--);
 }
                                                                        /*}}}*/

-// TagSection::Exists - return True if a tag exists                    /*{{{*/
-bool pkgTagSection::Exists(const char* const Tag)
+// TagSection::Exists - return True if a tag exists                    /*{{{*/
+bool pkgTagSection::Exists(const char* const Tag) const

 {
    unsigned int tmp;
    return Find(Tag, tmp);
 {
    unsigned int tmp;
    return Find(Tag, tmp);


@@ -319,78 +450,46 @@ bool pkgTagSection::Exists(const char* const Tag)
 /* This searches the section for a tag that matches the given string. */
 bool pkgTagSection::Find(const char *Tag,unsigned int &Pos) const
 {
 /* This searches the section for a tag that matches the given string. */
 bool pkgTagSection::Find(const char *Tag,unsigned int &Pos) const
 {

-   unsigned int Length = strlen(Tag);
-   unsigned int I = AlphaIndexes[AlphaHash(Tag)];
-   if (I == 0)
+   size_t const Length = strlen(Tag);
+   unsigned int Bucket = AlphaIndexes[AlphaHash(Tag, Length)];
+   if (Bucket == 0)

       return false;
       return false;

-   I--;
-   
-   for (unsigned int Counter = 0; Counter != TagCount; Counter++, 
-       I = (I+1)%TagCount)
+
+   for (; Bucket != 0; Bucket = d->Tags[Bucket - 1].NextInBucket)

    {
    {

-      const char *St;
-      St = Section + Indexes[I];
-      if (strncasecmp(Tag,St,Length) != 0)
+      if ((d->Tags[Bucket - 1].EndTag - d->Tags[Bucket - 1].StartTag) != Length)

         continue;
 
         continue;
 

-      // Make sure the colon is in the right place
-      const char *C = St + Length;
-      for (; isspace(*C) != 0; C++);
-      if (*C != ':')
+      char const * const St = Section + d->Tags[Bucket - 1].StartTag;
+      if (strncasecmp(Tag,St,Length) != 0)

         continue;
         continue;

-      Pos = I;
+
+      Pos = Bucket - 1;

       return true;
    }
 
    Pos = 0;
    return false;
 }
       return true;
    }
 
    Pos = 0;
    return false;
 }

-                                                                       /*}}}*/
-// TagSection::Find - Locate a tag                                     /*{{{*/
-// ---------------------------------------------------------------------
-/* This searches the section for a tag that matches the given string. */

 bool pkgTagSection::Find(const char *Tag,const char *&Start,
                         const char *&End) const
 {
 bool pkgTagSection::Find(const char *Tag,const char *&Start,
                         const char *&End) const
 {

-   unsigned int Length = strlen(Tag);
-   unsigned int I = AlphaIndexes[AlphaHash(Tag)];
-   if (I == 0)
+   unsigned int Pos;
+   if (Find(Tag, Pos) == false)

       return false;
       return false;

-   I--;
-   
-   for (unsigned int Counter = 0; Counter != TagCount; Counter++, 
-       I = (I+1)%TagCount)
-   {
-      const char *St;
-      St = Section + Indexes[I];
-      if (strncasecmp(Tag,St,Length) != 0)
-        continue;
-      
-      // Make sure the colon is in the right place
-      const char *C = St + Length;
-      for (; isspace(*C) != 0; C++);
-      if (*C != ':')
-        continue;

 
 

-      // 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--);
-      
-      return true;
-   }
-   
-   Start = End = 0;
-   return false;
+   Start = Section + d->Tags[Pos].StartValue;
+   // Strip off the gunk from the end
+   End = Section + d->Tags[Pos + 1].StartTag;
+   if (unlikely(Start > End))
+      return _error->Error("Internal parsing error");
+
+   for (; isspace(End[-1]) != 0 && End > Start; --End);
+
+   return true;

 }
                                                                        /*}}}*/
 // TagSection::FindS - Find a string                                   /*{{{*/
 }
                                                                        /*}}}*/
 // TagSection::FindS - Find a string                                   /*{{{*/

-// ---------------------------------------------------------------------
-/* */

 string pkgTagSection::FindS(const char *Tag) const
 {
    const char *Start;
 string pkgTagSection::FindS(const char *Tag) const
 {
    const char *Start;


@@ -400,6 +499,24 @@ string pkgTagSection::FindS(const char *Tag) const
    return string(Start,End);      
 }
                                                                        /*}}}*/
    return string(Start,End);      
 }
                                                                        /*}}}*/

+// TagSection::FindRawS - Find a string                                        /*{{{*/
+string pkgTagSection::FindRawS(const char *Tag) const
+{
+   unsigned int Pos;
+   if (Find(Tag, Pos) == false)
+      return "";
+
+   char const *Start = (char const *) memchr(Section + d->Tags[Pos].EndTag, ':', d->Tags[Pos].StartValue - d->Tags[Pos].EndTag);
+   ++Start;
+   char const *End = Section + d->Tags[Pos + 1].StartTag;
+   if (unlikely(Start > End))
+      return "";
+
+   for (; isspace(End[-1]) != 0 && End > Start; --End);
+
+   return std::string(Start, End - Start);
+}
+                                                                       /*}}}*/

 // TagSection::FindI - Find an integer                                 /*{{{*/
 // ---------------------------------------------------------------------
 /* */
 // TagSection::FindI - Find an integer                                 /*{{{*/
 // ---------------------------------------------------------------------
 /* */


@@ -416,9 +533,16 @@ signed int pkgTagSection::FindI(const char *Tag,signed long Default) const
       return Default;
    strncpy(S,Start,Stop-Start);
    S[Stop - Start] = 0;
       return Default;
    strncpy(S,Start,Stop-Start);
    S[Stop - Start] = 0;

-   
+
+   errno = 0;

    char *End;
    signed long Result = strtol(S,&End,10);
    char *End;
    signed long Result = strtol(S,&End,10);

+   if (errno == ERANGE)
+      _error->Errno("strtol", _("Cannot convert %s to integer"), S);
+   if (Result < std::numeric_limits<int>::min() || Result > std::numeric_limits<int>::max()) {
+      errno = ERANGE;
+      _error->Errno("", _("Cannot convert %s to integer"), S);
+   }

    if (S == End)
       return Default;
    return Result;
    if (S == End)
       return Default;
    return Result;


@@ -448,9 +572,48 @@ unsigned long long pkgTagSection::FindULL(const char *Tag, unsigned long long co
    return Result;
 }
                                                                        /*}}}*/
    return Result;
 }
                                                                        /*}}}*/

+// TagSection::FindB - Find boolean value                              /*{{{*/
+// ---------------------------------------------------------------------
+/* */
+bool pkgTagSection::FindB(const char *Tag, bool const &Default) const
+{
+   const char *Start, *Stop;
+   if (Find(Tag, Start, Stop) == false)
+      return Default;
+   return StringToBool(string(Start, Stop));
+}
+                                                                       /*}}}*/

 // TagSection::FindFlag - Locate a yes/no type flag                    /*{{{*/
 // ---------------------------------------------------------------------
 /* The bits marked in Flag are masked on/off in Flags */
 // TagSection::FindFlag - Locate a yes/no type flag                    /*{{{*/
 // ---------------------------------------------------------------------
 /* The bits marked in Flag are masked on/off in Flags */

+bool pkgTagSection::FindFlag(const char * const Tag, uint8_t &Flags,
+                            uint8_t const Flag) const
+{
+   const char *Start;
+   const char *Stop;
+   if (Find(Tag,Start,Stop) == false)
+      return true;
+   return FindFlag(Flags, Flag, Start, Stop);
+}
+bool pkgTagSection::FindFlag(uint8_t &Flags, uint8_t const Flag,
+                                       char const* const Start, char const* const Stop)
+{
+   switch (StringToBool(string(Start, Stop)))
+   {
+      case 0:
+      Flags &= ~Flag;
+      return true;
+
+      case 1:
+      Flags |= Flag;
+      return true;
+
+      default:
+      _error->Warning("Unknown flag value: %s",string(Start,Stop).c_str());
+      return true;
+   }
+   return true;
+}

 bool pkgTagSection::FindFlag(const char *Tag,unsigned long &Flags,
                             unsigned long Flag) const
 {
 bool pkgTagSection::FindFlag(const char *Tag,unsigned long &Flags,
                             unsigned long Flag) const
 {


@@ -460,7 +623,7 @@ bool pkgTagSection::FindFlag(const char *Tag,unsigned long &Flags,
       return true;
    return FindFlag(Flags, Flag, Start, Stop);
 }
       return true;
    return FindFlag(Flags, Flag, Start, Stop);
 }

-bool const pkgTagSection::FindFlag(unsigned long &Flags, unsigned long Flag,
+bool pkgTagSection::FindFlag(unsigned long &Flags, unsigned long Flag,

                                        char const* Start, char const* Stop)
 {
    switch (StringToBool(string(Start, Stop)))
                                        char const* Start, char const* Stop)
 {
    switch (StringToBool(string(Start, Stop)))


@@ -480,71 +643,161 @@ bool const pkgTagSection::FindFlag(unsigned long &Flags, unsigned long Flag,
    return true;
 }
                                                                        /*}}}*/
    return true;
 }
                                                                        /*}}}*/

+void pkgTagSection::Get(const char *&Start,const char *&Stop,unsigned int I) const
+{
+   Start = Section + d->Tags[I].StartTag;
+   Stop = Section + d->Tags[I+1].StartTag;
+}
+APT_PURE unsigned int pkgTagSection::Count() const {                   /*{{{*/
+   if (d->Tags.empty() == true)
+      return 0;
+   // the last element is just marking the end and isn't a real one
+   return d->Tags.size() - 1;
+}
+                                                                       /*}}}*/
+// TagSection::Write - Ordered (re)writing of fields                   /*{{{*/
+pkgTagSection::Tag pkgTagSection::Tag::Remove(std::string const &Name)
+{
+   return Tag(REMOVE, Name, "");
+}
+pkgTagSection::Tag pkgTagSection::Tag::Rename(std::string const &OldName, std::string const &NewName)
+{
+   return Tag(RENAME, OldName, NewName);
+}
+pkgTagSection::Tag pkgTagSection::Tag::Rewrite(std::string const &Name, std::string const &Data)
+{
+   if (Data.empty() == true)
+      return Tag(REMOVE, Name, "");
+   else
+      return Tag(REWRITE, Name, Data);
+}
+static bool WriteTag(FileFd &File, std::string Tag, std::string const &Value)
+{
+   if (Value.empty() || isspace(Value[0]) != 0)
+      Tag.append(":");
+   else
+      Tag.append(": ");
+   Tag.append(Value);
+   Tag.append("\n");
+   return File.Write(Tag.c_str(), Tag.length());
+}
+static bool RewriteTags(FileFd &File, pkgTagSection const * const This, char const * const Tag,
+      std::vector<pkgTagSection::Tag>::const_iterator &R,
+      std::vector<pkgTagSection::Tag>::const_iterator const &REnd)
+{
+   size_t const TagLen = strlen(Tag);
+   for (; R != REnd; ++R)
+   {
+      std::string data;
+      if (R->Name.length() == TagLen && strncasecmp(R->Name.c_str(), Tag, R->Name.length()) == 0)
+      {
+        if (R->Action != pkgTagSection::Tag::REWRITE)
+           break;
+        data = R->Data;
+      }
+      else if(R->Action == pkgTagSection::Tag::RENAME && R->Data.length() == TagLen &&
+           strncasecmp(R->Data.c_str(), Tag, R->Data.length()) == 0)
+        data = This->FindRawS(R->Name.c_str());
+      else
+        continue;
+
+      return WriteTag(File, Tag, data);
+   }
+   return true;
+}
+bool pkgTagSection::Write(FileFd &File, char const * const * const Order, std::vector<Tag> const &Rewrite) const
+{
+   // first pass: Write everything we have an order for
+   if (Order != NULL)
+   {
+      for (unsigned int I = 0; Order[I] != 0; ++I)
+      {
+        std::vector<Tag>::const_iterator R = Rewrite.begin();
+        if (RewriteTags(File, this, Order[I], R, Rewrite.end()) == false)
+           return false;
+        if (R != Rewrite.end())
+           continue;
+
+        if (Exists(Order[I]) == false)
+           continue;
+
+        if (WriteTag(File, Order[I], FindRawS(Order[I])) == false)
+           return false;
+      }
+   }
+   // second pass: See if we have tags which aren't ordered
+   if (d->Tags.empty() == false)
+   {
+      for (std::vector<pkgTagSectionPrivate::TagData>::const_iterator T = d->Tags.begin(); T != d->Tags.end() - 1; ++T)
+      {
+        char const * const fieldname = Section + T->StartTag;
+        size_t fieldnamelen = T->EndTag - T->StartTag;
+        if (Order != NULL)
+        {
+           unsigned int I = 0;
+           for (; Order[I] != 0; ++I)
+           {
+              if (fieldnamelen == strlen(Order[I]) && strncasecmp(fieldname, Order[I], fieldnamelen) == 0)
+                 break;
+           }
+           if (Order[I] != 0)
+              continue;
+        }
+
+        std::string const name(fieldname, fieldnamelen);
+        std::vector<Tag>::const_iterator R = Rewrite.begin();
+        if (RewriteTags(File, this, name.c_str(), R, Rewrite.end()) == false)
+           return false;
+        if (R != Rewrite.end())
+           continue;
+
+        if (WriteTag(File, name, FindRawS(name.c_str())) == false)
+           return false;
+      }
+   }
+   // last pass: see if there are any rewrites remaining we haven't done yet
+   for (std::vector<Tag>::const_iterator R = Rewrite.begin(); R != Rewrite.end(); ++R)
+   {
+      if (R->Action == Tag::REMOVE)
+        continue;
+      std::string const name = ((R->Action == Tag::RENAME) ? R->Data : R->Name);
+      if (Exists(name.c_str()))
+        continue;
+      if (Order != NULL)
+      {
+        unsigned int I = 0;
+        for (; Order[I] != 0; ++I)
+        {
+           if (strncasecmp(name.c_str(), Order[I], name.length()) == 0 && name.length() == strlen(Order[I]))
+              break;
+        }
+        if (Order[I] != 0)
+           continue;
+      }
+
+      if (WriteTag(File, name, ((R->Action == Tag::RENAME) ? FindRawS(R->Name.c_str()) : R->Data)) == false)
+        return false;
+   }
+   return true;
+}
+                                                                       /*}}}*/
+
+void pkgUserTagSection::TrimRecord(bool /*BeforeRecord*/, const char* &End)/*{{{*/
+{
+   for (; Stop < End && (Stop[0] == '\n' || Stop[0] == '\r' || Stop[0] == '#'); Stop++)
+      if (Stop[0] == '#')
+        Stop = (const char*) memchr(Stop,'\n',End-Stop);
+}
+                                                                       /*}}}*/
+
+#include "tagfile-order.c"
+

 // TFRewrite - Rewrite a control record                                        /*{{{*/
 // ---------------------------------------------------------------------
 /* This writes the control record to stdout rewriting it as necessary. The
    override map item specificies the rewriting rules to follow. This also
    takes the time to sort the feild list. */
 // TFRewrite - Rewrite a control record                                        /*{{{*/
 // ---------------------------------------------------------------------
 /* This writes the control record to stdout rewriting it as necessary. The
    override map item specificies the rewriting rules to follow. This also
    takes the time to sort the feild list. */

-
-/* The order of this list is taken from dpkg source lib/parse.c the fieldinfos
-   array. */
-static const char *iTFRewritePackageOrder[] = {
-                          "Package",
-                          "Essential",
-                          "Status",
-                          "Priority",
-                          "Section",
-                          "Installed-Size",
-                          "Maintainer",
-                          "Original-Maintainer",
-                          "Architecture",
-                          "Source",
-                          "Version",
-                           "Revision",         // Obsolete
-                           "Config-Version",   // Obsolete
-                          "Replaces",
-                          "Provides",
-                          "Depends",
-                          "Pre-Depends",
-                          "Recommends",
-                          "Suggests",
-                          "Conflicts",
-                          "Breaks",
-                          "Conffiles",
-                          "Filename",
-                          "Size",
-                          "MD5Sum",
-                          "SHA1",
-                          "SHA256",
-                          "SHA512",
-                           "MSDOS-Filename",   // Obsolete
-                          "Description",
-                          0};
-static const char *iTFRewriteSourceOrder[] = {"Package",
-                                      "Source",
-                                      "Binary",
-                                      "Version",
-                                      "Priority",
-                                      "Section",
-                                      "Maintainer",
-                                     "Original-Maintainer",
-                                      "Build-Depends",
-                                      "Build-Depends-Indep",
-                                      "Build-Conflicts",
-                                      "Build-Conflicts-Indep",
-                                      "Architecture",
-                                      "Standards-Version",
-                                      "Format",
-                                      "Directory",
-                                      "Files",
-                                      0};   
-
-/* Two levels of initialization are used because gcc will set the symbol
-   size of an array to the length of the array, causing dynamic relinking 
-   errors. Doing this makes the symbol size constant */
-const char **TFRewritePackageOrder = iTFRewritePackageOrder;
-const char **TFRewriteSourceOrder = iTFRewriteSourceOrder;
-   
+APT_IGNORE_DEPRECATED_PUSH

 bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[],
               TFRewriteData *Rewrite)
 {
 bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[],
               TFRewriteData *Rewrite)
 {


@@ -560,52 +813,54 @@ bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[],
    }
    
    // Write all all of the tags, in order.
    }
    
    // Write all all of the tags, in order.

-   for (unsigned int I = 0; Order[I] != 0; I++)
+   if (Order != NULL)

    {
    {

-      bool Rewritten = false;
-      
-      // See if this is a field that needs to be rewritten
-      for (unsigned int J = 0; Rewrite != 0 && Rewrite[J].Tag != 0; J++)
+      for (unsigned int I = 0; Order[I] != 0; I++)

       {
       {

-        if (strcasecmp(Rewrite[J].Tag,Order[I]) == 0)
-        {
-           Visited[J] |= 2;
-           if (Rewrite[J].Rewrite != 0 && Rewrite[J].Rewrite[0] != 0)
-           {
-              if (isspace(Rewrite[J].Rewrite[0]))
-                 fprintf(Output,"%s:%s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
-              else
-                 fprintf(Output,"%s: %s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
-           }
+         bool Rewritten = false;
+         
+         // See if this is a field that needs to be rewritten
+         for (unsigned int J = 0; Rewrite != 0 && Rewrite[J].Tag != 0; J++)
+         {
+            if (strcasecmp(Rewrite[J].Tag,Order[I]) == 0)
+            {
+               Visited[J] |= 2;
+               if (Rewrite[J].Rewrite != 0 && Rewrite[J].Rewrite[0] != 0)
+               {
+                  if (isspace(Rewrite[J].Rewrite[0]))
+                     fprintf(Output,"%s:%s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
+                  else
+                     fprintf(Output,"%s: %s\n",Rewrite[J].NewTag,Rewrite[J].Rewrite);
+               }
+               Rewritten = true;
+               break;
+            }
+         }

            
            

-           Rewritten = true;
-           break;
-        }
-      }      
-           
-      // See if it is in the fragment
-      unsigned Pos;
-      if (Tags.Find(Order[I],Pos) == false)
-        continue;
-      Visited[Pos] |= 1;
-
-      if (Rewritten == true)
-        continue;
+         // See if it is in the fragment
+         unsigned Pos;
+         if (Tags.Find(Order[I],Pos) == false)
+            continue;
+         Visited[Pos] |= 1;
+
+         if (Rewritten == true)
+            continue;

       
       

-      /* Write out this element, taking a moment to rewrite the tag
-         in case of changes of case. */
-      const char *Start;
-      const char *Stop;
-      Tags.Get(Start,Stop,Pos);
+         /* Write out this element, taking a moment to rewrite the tag
+            in case of changes of case. */
+         const char *Start;
+         const char *Stop;
+         Tags.Get(Start,Stop,Pos);

       
       

-      if (fputs(Order[I],Output) < 0)
-        return _error->Errno("fputs","IO Error to output");
-      Start += strlen(Order[I]);
-      if (fwrite(Start,Stop - Start,1,Output) != 1)
-        return _error->Errno("fwrite","IO Error to output");
-      if (Stop[-1] != '\n')
-        fprintf(Output,"\n");
-   }   
+         if (fputs(Order[I],Output) < 0)
+            return _error->Errno("fputs","IO Error to output");
+         Start += strlen(Order[I]);
+         if (fwrite(Start,Stop - Start,1,Output) != 1)
+            return _error->Errno("fwrite","IO Error to output");
+         if (Stop[-1] != '\n')
+            fprintf(Output,"\n");
+      }
+   }

 
    // Now write all the old tags that were missed.
    for (unsigned int I = 0; I != Tags.Count(); I++)
 
    // Now write all the old tags that were missed.
    for (unsigned int I = 0; I != Tags.Count(); I++)


@@ -666,4 +921,7 @@ bool TFRewrite(FILE *Output,pkgTagSection const &Tags,const char *Order[],
       
    return true;
 }
       
    return true;
 }

+APT_IGNORE_DEPRECATED_POP

                                                                        /*}}}*/
                                                                        /*}}}*/

+
+pkgTagSection::~pkgTagSection() { delete d; }