freepascal.compiler/compiler/cobjects.pas

{
    $Id$
    Copyright (c) 1993-98 by Florian Klaempfl

    This module provides some basic objects

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 ****************************************************************************
}

{$ifdef tp}
  {$E+,N+,D+,F+}
{$endif}
{$I-}
{$R-}{ necessary for crc calculation }

unit cobjects;

  interface

    uses
       strings
{$ifndef linux}
       ,dos
{$else}
       ,linux
{$endif}
      ;

    const   hasharraysize = 253; {The size of a hasharray should be a prime
                                  number for better spreading of nodes in
                                  the array!! (DM)}

    type
       pstring = ^string;

       pfileposinfo = ^tfileposinfo;
       tfileposinfo = record
         line      : longint;
         column    : word;
         fileindex : word;
       end;


       { some help data types }
       pstringitem = ^tstringitem;
       tstringitem = record
          data : pstring;
          next : pstringitem;
          fileinfo : tfileposinfo; { pointer to tinputfile }
       end;

       plinkedlist_item = ^tlinkedlist_item;
       tlinkedlist_item = object
          next,previous : plinkedlist_item;
          { does nothing }
          constructor init;
          destructor done;virtual;
       end;

       pstring_item = ^tstring_item;
       tstring_item = object(tlinkedlist_item)
          str : pstring;
          constructor init(const s : string);
          destructor done;virtual;
       end;


       { this implements a double linked list }
       plinkedlist = ^tlinkedlist;
       tlinkedlist = object
          first,last : plinkedlist_item;
          constructor init;
          destructor done;

          { disposes the items of the list }
          procedure clear;

          { concats a new item at the end }
          procedure concat(p : plinkedlist_item);

          { inserts a new item at the begin }
          procedure insert(p : plinkedlist_item);

          { inserts another list at the begin and make this list empty }
          procedure insertlist(p : plinkedlist);

          { concats another list at the end and make this list empty }
          procedure concatlist(p : plinkedlist);

          { removes p from the list (p isn't disposed) }
          { it's not tested if p is in the list !      }
          procedure remove(p : plinkedlist_item);

          { is the linkedlist empty ? }
          function  empty:boolean;
       end;


       { String Queue}
       PStringQueue=^TStringQueue;
       TStringQueue=object
         first,last : PStringItem;
         constructor Init;
         destructor Done;
         function Empty:boolean;
         function Get:string;
         procedure Insert(const s:string);
         procedure Concat(const s:string);
         procedure Clear;
       end;


       { string container }
       pstringcontainer = ^tstringcontainer;
       tstringcontainer = object
          root,
          last    : pstringitem;
          doubles : boolean;  { if this is set to true, doubles are allowed }
          constructor init;
          constructor init_no_double;
          destructor done;

          { true when the container is empty }
          function empty:boolean;

          { inserts a string }
          procedure insert(const s : string);
          procedure insert_with_tokeninfo(const s : string;const file_info : tfileposinfo);

          { gets a string }
          function get : string;
          function get_with_tokeninfo(var file_info : tfileposinfo) : string;

          { true if string is in the container }
          function find(const s:string):boolean;

          { deletes all strings }
          procedure clear;
       end;

       Pnamed_object=^Tnamed_object;
       Pdictionary=^Tdictionary;
       Pdictionaryhasharray=^Tdictionaryhasharray;

       Tdictionaryhasharray=array[0..hasharraysize-1] of Pnamed_object;

       Tcallback = procedure(p:Pnamed_object);

       Tdictionary=object
           root:Pnamed_object;
           hasharray:Pdictionaryhasharray;
           replace_existing : boolean;
           constructor init(usehash:boolean);
           procedure clear;virtual;
           procedure foreach(proc2call:Tcallback);
           function insert(obj:Pnamed_object):Pnamed_object;virtual;
           function search(const s:string):Pnamed_object;
           function speedsearch(const s:string;
            speedvalue:longint):Pnamed_object;virtual;
           destructor done;virtual;
       end;

        Tnamed_object=object
            _name:Pstring;
            left,right:Pnamed_object;
            speedvalue:longint;
            owner:Pdictionary;
            constructor init(const n:string);
            destructor done;virtual;
            function name:string;
        end;

       pdynamicarray = ^tdynamicarray;
       tdynamicarray = object
         posn,
         count,
         limit,
         elemlen,
         growcount : longint;
         data      : pchar;
         constructor init(Aelemlen,Agrow:longint);
         destructor  done;
         function  size:longint;
         function  usedsize:longint;
         procedure grow;
         procedure align(i:longint);
         procedure seek(i:longint);
         procedure write(var d;len:longint);
         procedure read(var d;len:longint);
         procedure writepos(pos:longint;var d;len:longint);
         procedure readpos(pos:longint;var d;len:longint);
       end;


{$ifdef BUFFEREDFILE}
       { this is implemented to allow buffered binary I/O }
       pbufferedfile = ^tbufferedfile;
       tbufferedfile = object
           f : file;
           buf : pchar;
           bufsize,buflast,bufpos : longint;

           { 0 closed, 1 input, 2 output }
           iomode : byte;

           { true, if the compile should change the endian of the output }
           change_endian : boolean;

           { calcules a crc for the file,                                    }
           { but it's assumed, that there no seek while do_crc is true       }
           do_crc : boolean;
           crc : longint;
           { temporary closing feature }
           tempclosed : boolean;
           tempmode : byte;
           temppos : longint;

           { inits a buffer with the size bufsize which is assigned to }
           { the file  filename                                        }
           constructor init(const filename : string;_bufsize : longint);

           { closes the file, if needed, and releases the memory }
           destructor done;virtual;

           { opens the file for input, other accesses are rejected }
           function  reset:boolean;

           { opens the file for output, other accesses are rejected }
           procedure rewrite;

           { reads or writes the buffer from or to disk }
           procedure flush;

           { writes a string to the file }
           { the string is written without a length byte }
           procedure write_string(const s : string);

           { writes a zero terminated string }
           procedure write_pchar(p : pchar);

           { write specific data types, takes care of }
           { byte order                               }
           procedure write_byte(b : byte);
           procedure write_word(w : word);
           procedure write_long(l : longint);
           procedure write_double(d : double);

           { writes any data }
           procedure write_data(var data;count : longint);

           { reads any data }
           procedure read_data(var data;bytes : longint;var count : longint);

           { closes the file and releases the buffer }
           procedure close;

           { temporary closing }
           procedure tempclose;
           procedure tempreopen;

           { goto the given position }
           procedure seek(l : longint);

           { installes an user defined buffer      }
           { and releases the old one, but be      }
           { careful, if the old buffer contains   }
           { data, this data is lost               }
           procedure setbuf(p : pchar;s : longint);

           { reads the file time stamp of the file, }
           { the file must be opened                }
           function getftime : longint;

           { returns filesize }
           function getsize : longint;

           { returns the path }
           function getpath : string;

           { resets the crc }
           procedure clear_crc;

           { returns the crc }
           function getcrc : longint;
       end;
{$endif BUFFEREDFILE}

    { releases the string p and assignes nil to p }
    { if p=nil then freemem isn't called          }
    procedure stringdispose(var p : pstring);

    { idem for ansistrings }
    procedure ansistringdispose(var p : pchar;length : longint);

    { allocates mem for a copy of s, copies s to this mem and returns }
    { a pointer to this mem                                           }
    function stringdup(const s : string) : pstring;

    { allocates memory for s and copies s as zero terminated string
      to that mem and returns a pointer to that mem }
    function strpnew(const s : string) : pchar;

    { makes a char lowercase, with spanish, french and german char set }
    function lowercase(c : char) : char;

    { makes zero terminated string to a pascal string }
    { the data in p is modified and p is returned     }
    function pchar2pstring(p : pchar) : pstring;

    { ambivalent to pchar2pstring }
    function pstring2pchar(p : pstring) : pchar;

  implementation

{$ifdef FPC}
    function getspeedvalue(const s : string) : longint;
      var
        p1,p2:^byte;
      begin
        p1:=@s;
        longint(p2):=longint(p1)+p1^+1;
        inc(longint(p1));
        getspeedvalue:=0;
        while p1<>p2 do
         begin
           inc(getspeedvalue,p1^);
           inc(longint(p1));
         end;
      end;
{$else}
    function getspeedvalue(const s : string) : longint;
      type
        ptrrec=record
          ofs,seg:word;
        end;
      var
        l,w   : longint;
        p1,p2 : ^byte;
      begin
        p1:=@s;
        ptrrec(p2).seg:=ptrrec(p1).seg;
        ptrrec(p2).ofs:=ptrrec(p1).ofs+p1^+1;
        inc(p1);
        l:=0;
        while p1<>p2 do
         begin
           l:=l+p1^;
           inc(p1);
         end;
        getspeedvalue:=l;
      end;
{$endif}

    function pchar2pstring(p : pchar) : pstring;
      var
         w,i : longint;
      begin
         w:=strlen(p);
         for i:=w-1 downto 0 do
           p[i+1]:=p[i];
         p[0]:=chr(w);
         pchar2pstring:=pstring(p);
      end;


    function pstring2pchar(p : pstring) : pchar;
      var
         w,i : longint;
      begin
         w:=length(p^);
         for i:=1 to w do
           p^[i-1]:=p^[i];
         p^[w]:=#0;
         pstring2pchar:=pchar(p);
      end;


    function lowercase(c : char) : char;
       begin
          case c of
             #65..#90 : c := chr(ord (c) + 32);
             #154 : c:=#129;  { german }
             #142 : c:=#132;  { german }
             #153 : c:=#148;  { german }
             #144 : c:=#130;  { french }
             #128 : c:=#135;  { french }
             #143 : c:=#134;  { swedish/norge (?) }
             #165 : c:=#164;  { spanish }
             #228 : c:=#229;  { greek }
             #226 : c:=#231;  { greek }
             #232 : c:=#227;  { greek }
          end;
          lowercase := c;
       end;


    function strpnew(const s : string) : pchar;
      var
         p : pchar;
      begin
         getmem(p,length(s)+1);
         strpcopy(p,s);
         strpnew:=p;
      end;


    procedure stringdispose(var p : pstring);
      begin
         if assigned(p) then
           freemem(p,length(p^)+1);
         p:=nil;
      end;


    procedure ansistringdispose(var p : pchar;length : longint);
      begin
         if assigned(p) then
           freemem(p,length+1);
         p:=nil;
      end;


    function stringdup(const s : string) : pstring;
      var
         p : pstring;
      begin
         getmem(p,length(s)+1);
         p^:=s;
         stringdup:=p;
      end;


{****************************************************************************
                                  TStringQueue
****************************************************************************}

constructor TStringQueue.Init;
begin
  first:=nil;
end;


function TStringQueue.Empty:boolean;
begin
  Empty:=(first=nil);
end;


function TStringQueue.Get:string;
var
  hp : pstringitem;
begin
  if first=nil then
   begin
     Get:='';
     exit;
   end;
  Get:=first^.data^;
  stringdispose(first^.data);
  hp:=first;
  first:=first^.next;
  dispose(hp);
end;


procedure TStringQueue.Insert(const s:string);
var
  hp : pstringitem;
begin
  new(hp);
  hp^.next:=first;
  hp^.data:=stringdup(s);
  first:=hp;
  if last=nil then
   last:=hp;
end;


procedure TStringQueue.Concat(const s:string);
var
  hp : pstringitem;
begin
  new(hp);
  hp^.next:=nil;
  hp^.data:=stringdup(s);
  if first=nil then
   first:=hp
  else
   last^.next:=hp;
  last:=hp;
end;


procedure TStringQueue.Clear;
var
  hp : pstringitem;
begin
  while (first<>nil) do
   begin
     hp:=first;
     stringdispose(first^.data);
     first:=first^.next;
     dispose(hp);
   end;
end;


destructor TStringQueue.Done;
begin
  Clear;
end;

{****************************************************************************
                           TSTRINGCONTAINER
 ****************************************************************************}

    constructor tstringcontainer.init;
      begin
         root:=nil;
         last:=nil;
         doubles:=true;
      end;


    constructor tstringcontainer.init_no_double;
      begin
         root:=nil;
         last:=nil;
         doubles:=false;
      end;


    destructor tstringcontainer.done;
      begin
         clear;
      end;


    function tstringcontainer.empty:boolean;
      begin
        empty:=(root=nil);
      end;


    procedure tstringcontainer.insert(const s : string);
      var
        hp : pstringitem;
      begin
         if not(doubles) then
           begin
              hp:=root;
              while assigned(hp) do
                begin
                   if hp^.data^=s then exit;
                   hp:=hp^.next;
                end;
           end;
         new(hp);
         hp^.next:=nil;
         hp^.data:=stringdup(s);
         if root=nil then root:=hp
           else last^.next:=hp;
         last:=hp;
      end;


    procedure tstringcontainer.insert_with_tokeninfo(const s : string; const file_info : tfileposinfo);
      var
         hp : pstringitem;
      begin
         if not(doubles) then
           begin
              hp:=root;
              while assigned(hp) do
                begin
                   if hp^.data^=s then exit;
                   hp:=hp^.next;
                end;
           end;
         new(hp);
         hp^.next:=nil;
         hp^.data:=stringdup(s);
         hp^.fileinfo:=file_info;
         if root=nil then root:=hp
           else last^.next:=hp;
         last:=hp;
      end;


    procedure tstringcontainer.clear;
      var
         hp : pstringitem;
      begin
         hp:=root;
         while assigned(hp) do
           begin
              stringdispose(hp^.data);
              root:=hp^.next;
              dispose(hp);
              hp:=root;
           end;
         last:=nil;
         root:=nil;
      end;


    function tstringcontainer.get : string;
      var
         hp : pstringitem;
      begin
         if root=nil then
          get:=''
         else
          begin
            get:=root^.data^;
            hp:=root;
            root:=root^.next;
            stringdispose(hp^.data);
            dispose(hp);
          end;
      end;


    function tstringcontainer.get_with_tokeninfo(var file_info : tfileposinfo) : string;
      var
         hp : pstringitem;
      begin
         if root=nil then
          begin
             get_with_tokeninfo:='';
             file_info.fileindex:=0;
             file_info.line:=0;
             file_info.column:=0;
          end
         else
          begin
            get_with_tokeninfo:=root^.data^;
            hp:=root;
            root:=root^.next;
            stringdispose(hp^.data);
            file_info:=hp^.fileinfo;
            dispose(hp);
          end;
      end;


    function tstringcontainer.find(const s:string):boolean;
      var
         hp : pstringitem;
      begin
        find:=false;
        hp:=root;
        while assigned(hp) do
         begin
           if hp^.data^=s then
            begin
              find:=true;
              exit;
            end;
           hp:=hp^.next;
         end;
      end;


{****************************************************************************
                            TLINKEDLIST_ITEM
 ****************************************************************************}

    constructor tlinkedlist_item.init;
      begin
         previous:=nil;
         next:=nil;
      end;

    destructor tlinkedlist_item.done;
      begin
      end;


{****************************************************************************
                            TSTRING_ITEM
 ****************************************************************************}

    constructor tstring_item.init(const s : string);
      begin
         str:=stringdup(s);
      end;


    destructor tstring_item.done;
      begin
         stringdispose(str);
         inherited done;
      end;


{****************************************************************************
                               TLINKEDLIST
 ****************************************************************************}

    constructor tlinkedlist.init;
      begin
         first:=nil;
         last:=nil;
      end;


    destructor tlinkedlist.done;
      begin
         clear;
      end;


    procedure tlinkedlist.clear;
      var
         hp : plinkedlist_item;
      begin
         hp:=first;
         while assigned(hp) do
           begin
              first:=hp^.next;
              dispose(hp,done);
              hp:=first;
           end;
      end;


    procedure tlinkedlist.insertlist(p : plinkedlist);
      begin
         { empty list ? }
         if not(assigned(p^.first)) then
           exit;

         p^.last^.next:=first;

         { we have a double linked list }
         if assigned(first) then
           first^.previous:=p^.last;

         first:=p^.first;

         if not(assigned(last)) then
           last:=p^.last;

         { p becomes empty }
         p^.first:=nil;
         p^.last:=nil;
      end;


    procedure tlinkedlist.concat(p : plinkedlist_item);
      begin
         p^.previous:=nil;
         p^.next:=nil;
         if not(assigned(first)) then
           first:=p
           else
             begin
                last^.next:=p;
                p^.previous:=last;
             end;
         last:=p;
      end;


    procedure tlinkedlist.insert(p : plinkedlist_item);
      begin
         p^.previous:=nil;
         p^.next:=nil;
         if not(assigned(first)) then
           last:=p
         else
           begin
              first^.previous:=p;
              p^.next:=first;
              first:=p;
           end;
         first:=p;
      end;


    procedure tlinkedlist.remove(p : plinkedlist_item);
      begin
         if not(assigned(p)) then
           exit;
         if (first=p) and (last=p) then
           begin
              first:=nil;
              last:=nil;
           end
         else if first=p then
           begin
              first:=p^.next;
              if assigned(first) then
                first^.previous:=nil;
           end
         else if last=p then
           begin
              last:=last^.previous;
              if assigned(last) then
                last^.next:=nil;
           end
         else
           begin
              p^.previous^.next:=p^.next;
              p^.next^.previous:=p^.previous;
           end;
         p^.next:=nil;
         p^.previous:=nil;
      end;


    procedure tlinkedlist.concatlist(p : plinkedlist);
     begin
         if not(assigned(p^.first)) then
           exit;

         if not(assigned(first)) then
           first:=p^.first
           else
             begin
                last^.next:=p^.first;
                p^.first^.previous:=last;
             end;

         last:=p^.last;

         { make p empty }
         p^.last:=nil;
         p^.first:=nil;
      end;


    function tlinkedlist.empty:boolean;
      begin
        empty:=(first=nil);
      end;

{****************************************************************************
                               TNAMED_OBJECT
 ****************************************************************************}

constructor Tnamed_object.init(const n:string);
begin
  left:=nil;
  right:=nil;
  _name:=stringdup(n);
  speedvalue:=getspeedvalue(n);
end;

destructor Tnamed_object.done;
begin
  stringdispose(_name);
end;

function Tnamed_object.name:string;
begin
  name:=_name^;
end;


{****************************************************************************
                               TDICTIONARY
****************************************************************************}

constructor Tdictionary.init(usehash:boolean);

begin
    root:=nil;
    hasharray:=nil;
    replace_existing:=false;
    if usehash then
        begin
            new(hasharray);
            fillchar(hasharray^,sizeof(hasharray^),0);
        end;
end;

procedure Tdictionary.clear;

var w:longint;

begin
    {remove no entry from a withsymtable as it is only a pointer to the
     recorddef  or objectdef symtable }
    { remove all entry from a symbol table }
    if assigned(root) then
        dispose(root,done);
    if assigned(hasharray) then
        for w:=0 to hasharraysize-1 do
            if assigned(hasharray^[w]) then
                begin
                    dispose(hasharray^[w],done);
                    hasharray^[w]:=nil;
                end;
end;

procedure Tdictionary.foreach(proc2call:Tcallback);

    procedure a(p:Pnamed_object);

    { must be preorder, because it's used by reading in }
    { a PPU file                                        }

    begin
        proc2call(p);
        if assigned(p^.left) then
            a(p^.left);
        if assigned(p^.right) then
            a(p^.right);
    end;

var i:longint;

begin
    if assigned(hasharray) then
        begin
            for i:=0 to hasharraysize-1 do
                if assigned(hasharray^[i]) then
                    a(hasharray^[i]);
        end
    else
        if assigned(root) then
            a(root);
end;


function Tdictionary.insert(obj:Pnamed_object):Pnamed_object;

    function _insert(var osym:Pnamed_object):Pnamed_object;

    {To prevent TP from allocating temp space for temp strings, we allocate
     some temp strings manually. We can use two temp strings, plus a third
     one that TP adds, where TP alone needs five temp strings!. Storing
     these on the heap saves even more, totally 1016 bytes per recursion!}

    var s1,s2:^string;

    begin
        if osym=nil then
            begin
                osym:=obj;
                _insert:=osym;
            end
        { first check speedvalue, to allow a fast insert }
        else
            if osym^.speedvalue>obj^.speedvalue then
                _insert:=_insert(osym^.right)
            else
                if osym^.speedvalue<obj^.speedvalue then
                    _insert:=_insert(osym^.left)
                else
                    begin
                        new(s1);
                        new(s2);
                        s1^:=osym^._name^;
                        s2^:=obj^._name^;
                        if s1^>s2^ then
                            begin
                                dispose(s2);
                                dispose(s1);
                                _insert:=_insert(osym^.right);
                            end
                        else
                            if s1^<s2^ then
                                begin
                                    dispose(s2);
                                    dispose(s1);
                                    _insert:=_insert(osym^.left);
                                end
                            else
                                begin
                                    dispose(s2);
                                    dispose(s1);
                                    if replace_existing and
                                       assigned(osym) then
                                      begin
                                        obj^.left:=osym^.left;
                                        obj^.right:=osym^.right;
                                        osym:=obj;
                                        _insert:=obj;
                                      end
                                    else
                                      _insert:=osym;
                                end;
                    end;
    end;

begin
    obj^.owner:=@self;
    obj^.speedvalue:=getspeedvalue(obj^._name^);
    if assigned(hasharray) then
        insert:=_insert(hasharray^[obj^.speedvalue mod hasharraysize])
    else
        insert:=_insert(root);
end;


function Tdictionary.search(const s:string):Pnamed_object;

begin
    search:=speedsearch(s,getspeedvalue(s));
end;

function Tdictionary.speedsearch(const s:string;
                                 speedvalue:longint):Pnamed_object;

var hp:Pnamed_object;

begin
    if assigned(hasharray) then
        hp:=hasharray^[speedvalue mod hasharraysize]
    else
        hp:=root;
        while assigned(hp) do
            begin
                if speedvalue>hp^.speedvalue then
                    hp:=hp^.left
                else
                    if speedvalue<hp^.speedvalue then
                        hp:=hp^.right
                    else
                        begin
                            if (hp^._name^=s) then
                                begin
                                    speedsearch:=hp;
                                    exit;
                                end
                            else
                                if s>hp^._name^ then
                                    hp:=hp^.left
                                else
                                    hp:=hp^.right;
                        end;
            end;
        speedsearch:=nil;
end;

destructor Tdictionary.done;

begin
    clear;
    if assigned(hasharray) then
        dispose(hasharray);
end;


{****************************************************************************
                                tdynamicarray
****************************************************************************}

    constructor tdynamicarray.init(Aelemlen,Agrow:longint);
      begin
        posn:=0;
        count:=0;
        limit:=0;
        data:=nil;
        elemlen:=Aelemlen;
        growcount:=Agrow;
        grow;
      end;

    function  tdynamicarray.size:longint;
      begin
        size:=limit*elemlen;
      end;

    function  tdynamicarray.usedsize:longint;
      begin
        usedsize:=count*elemlen;
      end;

    procedure tdynamicarray.grow;
      var
        osize : longint;
        odata : pchar;
      begin
        osize:=size;
        odata:=data;
        inc(limit,growcount);
        getmem(data,size);
        if assigned(odata) then
         begin
           move(odata^,data^,osize);
           freemem(odata,osize);
         end;
        fillchar(data[osize],growcount*elemlen,0);
      end;

    procedure tdynamicarray.align(i:longint);
      var
        j : longint;
      begin
        j:=(posn*elemlen mod i);
        if j<>0 then
         begin
           j:=i-j;
           while limit<(posn+j) do
            grow;
           inc(posn,j);
           if (posn>count) then
            count:=posn;
         end;
      end;

    procedure tdynamicarray.seek(i:longint);
      begin
        while limit<i do
         grow;
        posn:=i;
        if (posn>count) then
         count:=posn;
      end;

    procedure tdynamicarray.write(var d;len:longint);
      begin
        while limit<(posn+len) do
         grow;
        move(d,data[posn*elemlen],len*elemlen);
        inc(posn,len);
        if (posn>count) then
         count:=posn;
      end;

    procedure tdynamicarray.read(var d;len:longint);
      begin
        move(data[posn*elemlen],d,len*elemlen);
        inc(posn,len);
        if (posn>count) then
         count:=posn;
      end;

    procedure tdynamicarray.writepos(pos:longint;var d;len:longint);
      begin
        while limit<(pos+len) do
         grow;
        move(d,data[pos*elemlen],len*elemlen);
        posn:=pos+len;
        if (posn>count) then
         count:=posn;
      end;

    procedure tdynamicarray.readpos(pos:longint;var d;len:longint);
      begin
        while limit<(pos+len) do
         grow;
        move(data[pos*elemlen],d,len*elemlen);
        posn:=pos+len;
        if (posn>count) then
         count:=posn;
      end;

    destructor tdynamicarray.done;
      begin
        if assigned(data) then
         freemem(data,size);
      end;


{$ifdef BUFFEREDFILE}

{****************************************************************************
                               TBUFFEREDFILE
 ****************************************************************************}

    Const
       crcseed = $ffffffff;

       crctable : array[0..255] of longint = (
          $00000000,$77073096,$ee0e612c,$990951ba,$076dc419,$706af48f,
          $e963a535,$9e6495a3,$0edb8832,$79dcb8a4,$e0d5e91e,$97d2d988,
          $09b64c2b,$7eb17cbd,$e7b82d07,$90bf1d91,$1db71064,$6ab020f2,
          $f3b97148,$84be41de,$1adad47d,$6ddde4eb,$f4d4b551,$83d385c7,
          $136c9856,$646ba8c0,$fd62f97a,$8a65c9ec,$14015c4f,$63066cd9,
          $fa0f3d63,$8d080df5,$3b6e20c8,$4c69105e,$d56041e4,$a2677172,
          $3c03e4d1,$4b04d447,$d20d85fd,$a50ab56b,$35b5a8fa,$42b2986c,
          $dbbbc9d6,$acbcf940,$32d86ce3,$45df5c75,$dcd60dcf,$abd13d59,
          $26d930ac,$51de003a,$c8d75180,$bfd06116,$21b4f4b5,$56b3c423,
          $cfba9599,$b8bda50f,$2802b89e,$5f058808,$c60cd9b2,$b10be924,
          $2f6f7c87,$58684c11,$c1611dab,$b6662d3d,$76dc4190,$01db7106,
          $98d220bc,$efd5102a,$71b18589,$06b6b51f,$9fbfe4a5,$e8b8d433,
          $7807c9a2,$0f00f934,$9609a88e,$e10e9818,$7f6a0dbb,$086d3d2d,
          $91646c97,$e6635c01,$6b6b51f4,$1c6c6162,$856530d8,$f262004e,
          $6c0695ed,$1b01a57b,$8208f4c1,$f50fc457,$65b0d9c6,$12b7e950,
          $8bbeb8ea,$fcb9887c,$62dd1ddf,$15da2d49,$8cd37cf3,$fbd44c65,
          $4db26158,$3ab551ce,$a3bc0074,$d4bb30e2,$4adfa541,$3dd895d7,
          $a4d1c46d,$d3d6f4fb,$4369e96a,$346ed9fc,$ad678846,$da60b8d0,
          $44042d73,$33031de5,$aa0a4c5f,$dd0d7cc9,$5005713c,$270241aa,
          $be0b1010,$c90c2086,$5768b525,$206f85b3,$b966d409,$ce61e49f,
          $5edef90e,$29d9c998,$b0d09822,$c7d7a8b4,$59b33d17,$2eb40d81,
          $b7bd5c3b,$c0ba6cad,$edb88320,$9abfb3b6,$03b6e20c,$74b1d29a,
          $ead54739,$9dd277af,$04db2615,$73dc1683,$e3630b12,$94643b84,
          $0d6d6a3e,$7a6a5aa8,$e40ecf0b,$9309ff9d,$0a00ae27,$7d079eb1,
          $f00f9344,$8708a3d2,$1e01f268,$6906c2fe,$f762575d,$806567cb,
          $196c3671,$6e6b06e7,$fed41b76,$89d32be0,$10da7a5a,$67dd4acc,
          $f9b9df6f,$8ebeeff9,$17b7be43,$60b08ed5,$d6d6a3e8,$a1d1937e,
          $38d8c2c4,$4fdff252,$d1bb67f1,$a6bc5767,$3fb506dd,$48b2364b,
          $d80d2bda,$af0a1b4c,$36034af6,$41047a60,$df60efc3,$a867df55,
          $316e8eef,$4669be79,$cb61b38c,$bc66831a,$256fd2a0,$5268e236,
          $cc0c7795,$bb0b4703,$220216b9,$5505262f,$c5ba3bbe,$b2bd0b28,
          $2bb45a92,$5cb36a04,$c2d7ffa7,$b5d0cf31,$2cd99e8b,$5bdeae1d,
          $9b64c2b0,$ec63f226,$756aa39c,$026d930a,$9c0906a9,$eb0e363f,
          $72076785,$05005713,$95bf4a82,$e2b87a14,$7bb12bae,$0cb61b38,
          $92d28e9b,$e5d5be0d,$7cdcefb7,$0bdbdf21,$86d3d2d4,$f1d4e242,
          $68ddb3f8,$1fda836e,$81be16cd,$f6b9265b,$6fb077e1,$18b74777,
          $88085ae6,$ff0f6a70,$66063bca,$11010b5c,$8f659eff,$f862ae69,
          $616bffd3,$166ccf45,$a00ae278,$d70dd2ee,$4e048354,$3903b3c2,
          $a7672661,$d06016f7,$4969474d,$3e6e77db,$aed16a4a,$d9d65adc,
          $40df0b66,$37d83bf0,$a9bcae53,$debb9ec5,$47b2cf7f,$30b5ffe9,
          $bdbdf21c,$cabac28a,$53b39330,$24b4a3a6,$bad03605,$cdd70693,
          $54de5729,$23d967bf,$b3667a2e,$c4614ab8,$5d681b02,$2a6f2b94,
          $b40bbe37,$c30c8ea1,$5a05df1b,$2d02ef8d);

    constructor tbufferedfile.init(const filename : string;_bufsize : longint);

      begin
         assign(f,filename);
         bufsize:=_bufsize;
         bufpos:=0;
         buflast:=0;
         do_crc:=false;
         iomode:=0;
         tempclosed:=false;
         change_endian:=false;
         clear_crc;
      end;

    destructor tbufferedfile.done;

      begin
         close;
      end;

    procedure tbufferedfile.clear_crc;

      begin
         crc:=crcseed;
      end;

    procedure tbufferedfile.setbuf(p : pchar;s : longint);

      begin
         flush;
         freemem(buf,bufsize);
         bufsize:=s;
         buf:=p;
      end;

    function tbufferedfile.reset:boolean;

      var
         ofm : byte;
      begin
         ofm:=filemode;
         iomode:=1;
         getmem(buf,bufsize);
         filemode:=0;
         {$I-}
          system.reset(f,1);
         {$I+}
         reset:=(ioresult=0);
         filemode:=ofm;
      end;

    procedure tbufferedfile.rewrite;

      begin
         iomode:=2;
         getmem(buf,bufsize);
         system.rewrite(f,1);
      end;

    procedure tbufferedfile.flush;

      var
{$ifdef FPC}
         count : longint;
{$else}
         count : integer;
{$endif}

      begin
         if iomode=2 then
           begin
              if bufpos=0 then
                exit;
              blockwrite(f,buf^,bufpos)
           end
         else if iomode=1 then
            if buflast=bufpos then
              begin
                 blockread(f,buf^,bufsize,count);
                 buflast:=count;
              end;
         bufpos:=0;
      end;

    function tbufferedfile.getftime : longint;

      var
         l : longint;
{$ifdef linux}
         Info : Stat;
{$endif}
      begin
{$ifndef linux}
         { this only works if the file is open !! }
         dos.getftime(f,l);
{$else}
         Fstat(f,Info);
         l:=info.mtime;
{$endif}
         getftime:=l;
      end;

    function tbufferedfile.getsize : longint;

      begin
        getsize:=filesize(f);
      end;

    procedure tbufferedfile.seek(l : longint);

      begin
         if iomode=2 then
           begin
              flush;
              system.seek(f,l);
           end
         else if iomode=1 then
           begin
              { forces a reload }
              bufpos:=buflast;
              system.seek(f,l);
              flush;
           end;
      end;

    type
{$ifdef tp}
       bytearray1 = array [1..65535] of byte;
{$else}
       bytearray1 = array [1..10000000] of byte;
{$endif}

    procedure tbufferedfile.read_data(var data;bytes : longint;var count : longint);

      var
         p : pchar;
         c,i : longint;

      begin
         p:=pchar(@data);
         count:=0;
         while bytes-count>0 do
           begin
              if bytes-count>buflast-bufpos then
                begin
                   move((buf+bufpos)^,(p+count)^,buflast-bufpos);
                   inc(count,buflast-bufpos);
                   bufpos:=buflast;
                   flush;
                   { can't we read anything ? }
                   if bufpos=buflast then
                     break;
                end
              else
                begin
                   move((buf+bufpos)^,(p+count)^,bytes-count);
                   inc(bufpos,bytes-count);
                   count:=bytes;
                   break;
                end;
           end;
         if do_crc then
           begin
              c:=crc;
              for i:=1 to bytes do
              c:=(c shr 8) xor crctable[byte(c) xor (bytearray1(data)[i])];
              crc:=c;
           end;
      end;

    procedure tbufferedfile.write_data(var data;count : longint);

      var
         c,i : longint;

      begin
         if bufpos+count>bufsize then
           flush;
         move(data,(buf+bufpos)^,count);
         inc(bufpos,count);
         if do_crc then
           begin
              c:=crc;
              for i:=1 to count do
                c:=(c shr 8) xor crctable[byte(c) xor (bytearray1(data)[i])];
              crc:=c;
           end;
      end;

    function tbufferedfile.getcrc : longint;

      begin
         getcrc:=crc xor crcseed;
      end;

    procedure tbufferedfile.write_string(const s : string);

      begin
        if bufpos+length(s)>bufsize then
          flush;
        { why is there not CRC here ??? }
        move(s[1],(buf+bufpos)^,length(s));
        inc(bufpos,length(s));
         { should be
        write_data(s[1],length(s)); }
      end;

    procedure tbufferedfile.write_pchar(p : pchar);

      var
         l : longint;

      begin
        l:=strlen(p);
        if l>=bufsize then
          runerror(222);
        { why is there not CRC here ???}
        if bufpos+l>bufsize then
          flush;
        move(p^,(buf+bufpos)^,l);
        inc(bufpos,l);
         { should be
        write_data(p^,l); }
      end;

    procedure tbufferedfile.write_byte(b : byte);

      begin
         write_data(b,sizeof(byte));
      end;

    procedure tbufferedfile.write_long(l : longint);

      var
         w1,w2 : word;

      begin
         if change_endian then
           begin
              w1:=l and $ffff;
              w2:=l shr 16;
              l:=swap(w2)+(longint(swap(w1)) shl 16);
              write_data(l,sizeof(longint))
           end
         else
           write_data(l,sizeof(longint))
      end;

    procedure tbufferedfile.write_word(w : word);

      begin
         if change_endian then
           begin
              w:=swap(w);
              write_data(w,sizeof(word))
           end
         else
           write_data(w,sizeof(word));
      end;

    procedure tbufferedfile.write_double(d : double);

      begin
         write_data(d,sizeof(double));
      end;

    function tbufferedfile.getpath : string;

      begin
{$ifdef dummy}
         getpath:=strpas(filerec(f).name);
{$endif}
         getpath:='';
      end;

    procedure tbufferedfile.close;

      begin
         if iomode<>0 then
           begin
              flush;
              system.close(f);
              freemem(buf,bufsize);
              buf:=nil;
              iomode:=0;
           end;
      end;

    procedure tbufferedfile.tempclose;

      begin
        if iomode<>0 then
         begin
           temppos:=system.filepos(f);
           tempmode:=iomode;
           tempclosed:=true;
           system.close(f);
           iomode:=0;
         end
        else
         tempclosed:=false;
      end;

    procedure tbufferedfile.tempreopen;

      var
         ofm : byte;

      begin
         if tempclosed then
           begin
              case tempmode of
               1 : begin
                     ofm:=filemode;
                     iomode:=1;
                     filemode:=0;
                     system.reset(f,1);
                     filemode:=ofm;
                   end;
               2 : begin
                     iomode:=2;
                     system.rewrite(f,1);
                   end;
              end;
              system.seek(f,temppos);
              tempclosed:=false;
           end;
      end;

{$endif BUFFEREDFILE}

end.
{
  $Log$
  Revision 1.20  1999-03-18 20:30:45  peter
    + .a writer

  Revision 1.19  1999/03/01 13:32:00  pierre
   * external used before implemented problem fixed

  Revision 1.18  1999/02/24 00:59:13  peter
    * small updates for ag386bin

  Revision 1.17  1999/01/19 11:00:33  daniel
  + Tdictionary object:  Tsymtable will become object(TTdictionary) in the
    future
  + Tnamed_item object:  Tsym will become object(Tnamed_item) in the future

  Revision 1.16  1998/11/04 10:11:37  peter
    * ansistring fixes

  Revision 1.15  1998/10/19 18:04:40  peter
    + tstringcontainer.init_no_doubles

  Revision 1.14  1998/09/18 16:03:37  florian
    * some changes to compile with Delphi

  Revision 1.13  1998/08/12 19:28:16  peter
    * better libc support

  Revision 1.12  1998/07/14 14:46:47  peter
    * released NEWINPUT

  Revision 1.11  1998/07/07 11:19:54  peter
    + NEWINPUT for a better inputfile and scanner object

  Revision 1.10  1998/07/01 15:26:59  peter
    * better bufferfile.reset error handling

  Revision 1.9  1998/06/03 23:40:37  peter
    + unlimited file support, release tempclose

  Revision 1.8  1998/05/20 09:42:33  pierre
    + UseTokenInfo now default
    * unit in interface uses and implementation uses gives error now
    * only one error for unknown symbol (uses lastsymknown boolean)
      the problem came from the label code !
    + first inlined procedures and function work
      (warning there might be allowed cases were the result is still wrong !!)
    * UseBrower updated gives a global list of all position of all used symbols
      with switch -gb

  Revision 1.7  1998/05/06 18:36:53  peter
    * tai_section extended with code,data,bss sections and enumerated type
    * ident 'compiled by FPC' moved to pmodules
    * small fix for smartlink

  Revision 1.6  1998/05/06 08:38:37  pierre
    * better position info with UseTokenInfo
      UseTokenInfo greatly simplified
    + added check for changed tree after first time firstpass
      (if we could remove all the cases were it happen
      we could skip all firstpass if firstpasscount > 1)
      Only with ExtDebug

  Revision 1.5  1998/04/30 15:59:40  pierre
    * GDB works again better :
      correct type info in one pass
    + UseTokenInfo for better source position
    * fixed one remaining bug in scanner for line counts
    * several little fixes

  Revision 1.4  1998/04/29 10:33:50  pierre
    + added some code for ansistring (not complete nor working yet)
    * corrected operator overloading
    * corrected nasm output
    + started inline procedures
    + added starstarn : use ** for exponentiation (^ gave problems)
    + started UseTokenInfo cond to get accurate positions

  Revision 1.3  1998/04/27 23:10:28  peter
    + new scanner
    * $makelib -> if smartlink
    * small filename fixes pmodule.setfilename
    * moved import from files.pas -> import.pas

  Revision 1.2  1998/04/07 11:09:04  peter
    + filemode is set correct in tbufferedfile.reset
}