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565 lines
22 KiB
ObjectPascal
565 lines
22 KiB
ObjectPascal
{
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This file is part of the Free Pascal run time library.
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Copyright (c) 2000 by Florian Klaempfl
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member of the Free Pascal development team.
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This unit implements several classes for charset conversions
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See the file COPYING.FPC, included in this distribution,
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for details about the copyright.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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**********************************************************************}
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{$mode objfpc}
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unit ccharset;
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interface
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type
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tunicodechar = word;
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tunicodestring = ^tunicodechar;
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tcsconvert = class
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// !!!!!!1constructor create;
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end;
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tunicodecharmappingflag = (umf_noinfo,umf_leadbyte,umf_undefined,
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umf_unused);
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punicodecharmapping = ^tunicodecharmapping;
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tunicodecharmapping = record
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unicode : tunicodechar;
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flag : tunicodecharmappingflag;
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reserved : byte;
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end;
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punicodemap = ^tunicodemap;
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tunicodemap = record
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cpname : string[20];
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cp : word;
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map : punicodecharmapping;
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lastchar : longint;
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next : punicodemap;
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internalmap : boolean;
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end;
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tcp2unicode = class(tcsconvert)
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end;
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const
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DefaultSystemCodePage = 437;
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function loadunicodemapping(const cpname,f : string; cp :word) : punicodemap;
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procedure registermapping(p : punicodemap);
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function getmap(const s : string) : punicodemap;
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function getmap(cp : word) : punicodemap;
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function mappingavailable(const s : string) : boolean;
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function mappingavailable(cp :word) : boolean;
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function getunicode(c : char;p : punicodemap) : tunicodechar;
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function getascii(c : tunicodechar;p : punicodemap) : string;
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implementation
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var
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mappings : punicodemap;
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function loadunicodemapping(const cpname,f : string; cp :word) : punicodemap;
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var
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data : punicodecharmapping;
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datasize : longint;
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t : text;
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s,hs : string;
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scanpos,charpos,unicodevalue : longint;
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code : word;
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flag : tunicodecharmappingflag;
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p : punicodemap;
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lastchar : longint;
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begin
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lastchar:=-1;
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loadunicodemapping:=nil;
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datasize:=256;
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getmem(data,sizeof(tunicodecharmapping)*datasize);
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assign(t,f);
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{$I-}
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reset(t);
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{$I+}
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if ioresult<>0 then
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begin
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freemem(data,sizeof(tunicodecharmapping)*datasize);
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exit;
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end;
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while not(eof(t)) do
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begin
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readln(t,s);
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if (s[1]='0') and (s[2]='x') then
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begin
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flag:=umf_unused;
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scanpos:=3;
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hs:='$';
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while s[scanpos] in ['0'..'9','A'..'F','a'..'f'] do
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begin
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hs:=hs+s[scanpos];
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inc(scanpos);
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end;
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val(hs,charpos,code);
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if code<>0 then
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begin
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freemem(data,sizeof(tunicodecharmapping)*datasize);
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close(t);
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exit;
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end;
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while not(s[scanpos] in ['0','#']) do
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inc(scanpos);
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if s[scanpos]='#' then
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begin
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{ special char }
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unicodevalue:=$ffff;
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hs:=copy(s,scanpos,length(s)-scanpos+1);
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if hs='#DBCS LEAD BYTE' then
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flag:=umf_leadbyte;
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end
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else
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begin
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{ C hex prefix }
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inc(scanpos,2);
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hs:='$';
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while s[scanpos] in ['0'..'9','A'..'F','a'..'f'] do
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begin
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hs:=hs+s[scanpos];
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inc(scanpos);
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end;
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val(hs,unicodevalue,code);
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if code<>0 then
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begin
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freemem(data,sizeof(tunicodecharmapping)*datasize);
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close(t);
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exit;
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end;
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if charpos>datasize then
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begin
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{ allocate 1024 bytes more because }
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{ if we need more than 256 entries it's }
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{ probably a mbcs with a lot of }
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{ entries }
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datasize:=charpos+1024;
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reallocmem(data,sizeof(tunicodecharmapping)*datasize);
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end;
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flag:=umf_noinfo;
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end;
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data[charpos].flag:=flag;
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data[charpos].unicode:=unicodevalue;
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if charpos>lastchar then
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lastchar:=charpos;
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end;
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end;
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close(t);
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new(p);
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p^.lastchar:=lastchar;
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p^.cpname:=cpname;
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p^.cp:=cp;
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p^.internalmap:=false;
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p^.next:=nil;
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p^.map:=data;
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loadunicodemapping:=p;
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end;
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procedure registermapping(p : punicodemap);
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begin
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p^.next:=mappings;
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mappings:=p;
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end;
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function getmap(const s : string) : punicodemap;
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var
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hp : punicodemap;
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const
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mapcache : string = '';
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mapcachep : punicodemap = nil;
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begin
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if (mapcache=s) and assigned(mapcachep) and (mapcachep^.cpname=s) then
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begin
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getmap:=mapcachep;
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exit;
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end;
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hp:=mappings;
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while assigned(hp) do
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begin
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if hp^.cpname=s then
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begin
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getmap:=hp;
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mapcache:=s;
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mapcachep:=hp;
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exit;
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end;
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hp:=hp^.next;
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end;
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getmap:=nil;
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end;////////
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function getmap(cp : word) : punicodemap;
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var
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hp : punicodemap;
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const
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mapcache : word = 0;
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mapcachep : punicodemap = nil;
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begin
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if (mapcache=cp) and assigned(mapcachep) and (mapcachep^.cp=cp) then
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begin
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getmap:=mapcachep;
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exit;
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end;
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hp:=mappings;
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while assigned(hp) do
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begin
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if hp^.cp=cp then
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begin
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getmap:=hp;
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mapcache:=cp;
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mapcachep:=hp;
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exit;
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end;
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hp:=hp^.next;
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end;
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getmap:=nil;
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end;
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function mappingavailable(const s : string) : boolean;
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begin
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mappingavailable:=getmap(s)<>nil;
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end;
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function mappingavailable(cp : word) : boolean;
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begin
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mappingavailable:=getmap(cp)<>nil;
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end;
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function getunicode(c : char;p : punicodemap) : tunicodechar;
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begin
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if ord(c)<=p^.lastchar then
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getunicode:=p^.map[ord(c)].unicode
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else
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getunicode:=0;
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end;
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function getascii(c : tunicodechar;p : punicodemap) : string;
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var
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i : longint;
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begin
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{ at least map to '?' }
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getascii:=#63;
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for i:=0 to p^.lastchar do
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if p^.map[i].unicode=c then
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begin
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if i<256 then
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getascii:=chr(i)
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else
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getascii:=chr(i div 256)+chr(i mod 256);
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exit;
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end;
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end;
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const
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map : array[0..255] of tunicodecharmapping = (
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(unicode : 0; flag : umf_noinfo; reserved: 0),
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(unicode : 1; flag : umf_noinfo; reserved: 0),
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(unicode : 2; flag : umf_noinfo; reserved: 0),
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(unicode : 3; flag : umf_noinfo; reserved: 0),
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(unicode : 4; flag : umf_noinfo; reserved: 0),
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(unicode : 5; flag : umf_noinfo; reserved: 0),
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(unicode : 6; flag : umf_noinfo; reserved: 0),
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(unicode : 7; flag : umf_noinfo; reserved: 0),
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(unicode : 8; flag : umf_noinfo; reserved: 0),
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(unicode : 9; flag : umf_noinfo; reserved: 0),
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(unicode : 10; flag : umf_noinfo; reserved: 0),
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(unicode : 11; flag : umf_noinfo; reserved: 0),
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(unicode : 12; flag : umf_noinfo; reserved: 0),
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(unicode : 13; flag : umf_noinfo; reserved: 0),
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(unicode : 14; flag : umf_noinfo; reserved: 0),
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(unicode : 15; flag : umf_noinfo; reserved: 0),
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(unicode : 16; flag : umf_noinfo; reserved: 0),
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(unicode : 17; flag : umf_noinfo; reserved: 0),
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(unicode : 18; flag : umf_noinfo; reserved: 0),
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(unicode : 19; flag : umf_noinfo; reserved: 0),
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(unicode : 20; flag : umf_noinfo; reserved: 0),
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(unicode : 21; flag : umf_noinfo; reserved: 0),
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(unicode : 22; flag : umf_noinfo; reserved: 0),
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(unicode : 23; flag : umf_noinfo; reserved: 0),
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(unicode : 24; flag : umf_noinfo; reserved: 0),
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(unicode : 25; flag : umf_noinfo; reserved: 0),
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(unicode : 26; flag : umf_noinfo; reserved: 0),
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(unicode : 27; flag : umf_noinfo; reserved: 0),
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(unicode : 28; flag : umf_noinfo; reserved: 0),
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(unicode : 29; flag : umf_noinfo; reserved: 0),
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(unicode : 30; flag : umf_noinfo; reserved: 0),
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(unicode : 31; flag : umf_noinfo; reserved: 0),
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(unicode : 32; flag : umf_noinfo; reserved: 0),
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(unicode : 33; flag : umf_noinfo; reserved: 0),
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(unicode : 34; flag : umf_noinfo; reserved: 0),
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(unicode : 35; flag : umf_noinfo; reserved: 0),
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(unicode : 36; flag : umf_noinfo; reserved: 0),
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(unicode : 37; flag : umf_noinfo; reserved: 0),
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(unicode : 38; flag : umf_noinfo; reserved: 0),
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(unicode : 39; flag : umf_noinfo; reserved: 0),
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(unicode : 40; flag : umf_noinfo; reserved: 0),
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(unicode : 41; flag : umf_noinfo; reserved: 0),
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(unicode : 42; flag : umf_noinfo; reserved: 0),
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(unicode : 43; flag : umf_noinfo; reserved: 0),
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(unicode : 44; flag : umf_noinfo; reserved: 0),
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(unicode : 45; flag : umf_noinfo; reserved: 0),
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(unicode : 46; flag : umf_noinfo; reserved: 0),
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(unicode : 47; flag : umf_noinfo; reserved: 0),
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(unicode : 48; flag : umf_noinfo; reserved: 0),
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(unicode : 49; flag : umf_noinfo; reserved: 0),
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(unicode : 50; flag : umf_noinfo; reserved: 0),
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(unicode : 51; flag : umf_noinfo; reserved: 0),
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(unicode : 52; flag : umf_noinfo; reserved: 0),
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(unicode : 53; flag : umf_noinfo; reserved: 0),
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(unicode : 54; flag : umf_noinfo; reserved: 0),
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(unicode : 55; flag : umf_noinfo; reserved: 0),
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(unicode : 56; flag : umf_noinfo; reserved: 0),
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(unicode : 57; flag : umf_noinfo; reserved: 0),
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(unicode : 58; flag : umf_noinfo; reserved: 0),
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(unicode : 59; flag : umf_noinfo; reserved: 0),
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(unicode : 60; flag : umf_noinfo; reserved: 0),
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(unicode : 61; flag : umf_noinfo; reserved: 0),
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(unicode : 62; flag : umf_noinfo; reserved: 0),
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(unicode : 63; flag : umf_noinfo; reserved: 0),
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(unicode : 64; flag : umf_noinfo; reserved: 0),
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(unicode : 65; flag : umf_noinfo; reserved: 0),
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(unicode : 66; flag : umf_noinfo; reserved: 0),
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(unicode : 67; flag : umf_noinfo; reserved: 0),
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(unicode : 68; flag : umf_noinfo; reserved: 0),
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(unicode : 69; flag : umf_noinfo; reserved: 0),
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(unicode : 70; flag : umf_noinfo; reserved: 0),
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(unicode : 71; flag : umf_noinfo; reserved: 0),
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(unicode : 72; flag : umf_noinfo; reserved: 0),
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(unicode : 73; flag : umf_noinfo; reserved: 0),
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(unicode : 74; flag : umf_noinfo; reserved: 0),
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(unicode : 75; flag : umf_noinfo; reserved: 0),
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(unicode : 76; flag : umf_noinfo; reserved: 0),
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(unicode : 77; flag : umf_noinfo; reserved: 0),
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(unicode : 78; flag : umf_noinfo; reserved: 0),
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(unicode : 79; flag : umf_noinfo; reserved: 0),
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(unicode : 80; flag : umf_noinfo; reserved: 0),
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(unicode : 81; flag : umf_noinfo; reserved: 0),
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(unicode : 82; flag : umf_noinfo; reserved: 0),
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(unicode : 83; flag : umf_noinfo; reserved: 0),
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(unicode : 84; flag : umf_noinfo; reserved: 0),
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(unicode : 85; flag : umf_noinfo; reserved: 0),
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(unicode : 86; flag : umf_noinfo; reserved: 0),
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(unicode : 87; flag : umf_noinfo; reserved: 0),
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(unicode : 88; flag : umf_noinfo; reserved: 0),
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(unicode : 89; flag : umf_noinfo; reserved: 0),
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(unicode : 90; flag : umf_noinfo; reserved: 0),
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(unicode : 91; flag : umf_noinfo; reserved: 0),
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(unicode : 92; flag : umf_noinfo; reserved: 0),
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(unicode : 93; flag : umf_noinfo; reserved: 0),
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(unicode : 94; flag : umf_noinfo; reserved: 0),
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(unicode : 95; flag : umf_noinfo; reserved: 0),
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(unicode : 96; flag : umf_noinfo; reserved: 0),
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(unicode : 97; flag : umf_noinfo; reserved: 0),
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(unicode : 98; flag : umf_noinfo; reserved: 0),
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(unicode : 99; flag : umf_noinfo; reserved: 0),
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(unicode : 100; flag : umf_noinfo; reserved: 0),
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(unicode : 101; flag : umf_noinfo; reserved: 0),
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(unicode : 102; flag : umf_noinfo; reserved: 0),
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(unicode : 103; flag : umf_noinfo; reserved: 0),
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(unicode : 104; flag : umf_noinfo; reserved: 0),
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(unicode : 105; flag : umf_noinfo; reserved: 0),
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(unicode : 106; flag : umf_noinfo; reserved: 0),
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(unicode : 107; flag : umf_noinfo; reserved: 0),
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(unicode : 108; flag : umf_noinfo; reserved: 0),
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(unicode : 109; flag : umf_noinfo; reserved: 0),
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(unicode : 110; flag : umf_noinfo; reserved: 0),
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(unicode : 111; flag : umf_noinfo; reserved: 0),
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(unicode : 112; flag : umf_noinfo; reserved: 0),
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(unicode : 113; flag : umf_noinfo; reserved: 0),
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(unicode : 114; flag : umf_noinfo; reserved: 0),
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(unicode : 115; flag : umf_noinfo; reserved: 0),
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(unicode : 116; flag : umf_noinfo; reserved: 0),
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(unicode : 117; flag : umf_noinfo; reserved: 0),
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(unicode : 118; flag : umf_noinfo; reserved: 0),
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(unicode : 119; flag : umf_noinfo; reserved: 0),
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(unicode : 120; flag : umf_noinfo; reserved: 0),
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(unicode : 121; flag : umf_noinfo; reserved: 0),
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(unicode : 122; flag : umf_noinfo; reserved: 0),
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(unicode : 123; flag : umf_noinfo; reserved: 0),
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(unicode : 124; flag : umf_noinfo; reserved: 0),
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(unicode : 125; flag : umf_noinfo; reserved: 0),
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(unicode : 126; flag : umf_noinfo; reserved: 0),
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(unicode : 127; flag : umf_noinfo; reserved: 0),
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(unicode : 128; flag : umf_noinfo; reserved: 0),
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(unicode : 129; flag : umf_noinfo; reserved: 0),
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(unicode : 130; flag : umf_noinfo; reserved: 0),
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(unicode : 131; flag : umf_noinfo; reserved: 0),
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(unicode : 132; flag : umf_noinfo; reserved: 0),
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(unicode : 133; flag : umf_noinfo; reserved: 0),
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(unicode : 134; flag : umf_noinfo; reserved: 0),
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(unicode : 135; flag : umf_noinfo; reserved: 0),
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(unicode : 136; flag : umf_noinfo; reserved: 0),
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(unicode : 137; flag : umf_noinfo; reserved: 0),
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(unicode : 138; flag : umf_noinfo; reserved: 0),
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(unicode : 139; flag : umf_noinfo; reserved: 0),
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(unicode : 140; flag : umf_noinfo; reserved: 0),
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(unicode : 141; flag : umf_noinfo; reserved: 0),
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(unicode : 142; flag : umf_noinfo; reserved: 0),
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(unicode : 143; flag : umf_noinfo; reserved: 0),
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(unicode : 144; flag : umf_noinfo; reserved: 0),
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(unicode : 145; flag : umf_noinfo; reserved: 0),
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(unicode : 146; flag : umf_noinfo; reserved: 0),
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(unicode : 147; flag : umf_noinfo; reserved: 0),
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(unicode : 148; flag : umf_noinfo; reserved: 0),
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(unicode : 149; flag : umf_noinfo; reserved: 0),
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(unicode : 150; flag : umf_noinfo; reserved: 0),
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(unicode : 151; flag : umf_noinfo; reserved: 0),
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(unicode : 152; flag : umf_noinfo; reserved: 0),
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(unicode : 153; flag : umf_noinfo; reserved: 0),
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(unicode : 154; flag : umf_noinfo; reserved: 0),
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(unicode : 155; flag : umf_noinfo; reserved: 0),
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(unicode : 156; flag : umf_noinfo; reserved: 0),
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(unicode : 157; flag : umf_noinfo; reserved: 0),
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(unicode : 158; flag : umf_noinfo; reserved: 0),
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(unicode : 159; flag : umf_noinfo; reserved: 0),
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(unicode : 160; flag : umf_noinfo; reserved: 0),
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(unicode : 161; flag : umf_noinfo; reserved: 0),
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(unicode : 162; flag : umf_noinfo; reserved: 0),
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(unicode : 163; flag : umf_noinfo; reserved: 0),
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(unicode : 164; flag : umf_noinfo; reserved: 0),
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(unicode : 165; flag : umf_noinfo; reserved: 0),
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(unicode : 166; flag : umf_noinfo; reserved: 0),
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(unicode : 167; flag : umf_noinfo; reserved: 0),
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(unicode : 168; flag : umf_noinfo; reserved: 0),
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(unicode : 169; flag : umf_noinfo; reserved: 0),
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(unicode : 170; flag : umf_noinfo; reserved: 0),
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(unicode : 171; flag : umf_noinfo; reserved: 0),
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(unicode : 172; flag : umf_noinfo; reserved: 0),
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(unicode : 173; flag : umf_noinfo; reserved: 0),
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|
(unicode : 174; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 175; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 176; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 177; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 178; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 179; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 180; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 181; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 182; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 183; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 184; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 185; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 186; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 187; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 188; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 189; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 190; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 191; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 192; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 193; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 194; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 195; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 196; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 197; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 198; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 199; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 200; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 201; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 202; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 203; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 204; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 205; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 206; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 207; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 208; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 209; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 210; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 211; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 212; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 213; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 214; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 215; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 216; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 217; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 218; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 219; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 220; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 221; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 222; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 223; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 224; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 225; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 226; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 227; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 228; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 229; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 230; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 231; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 232; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 233; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 234; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 235; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 236; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 237; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 238; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 239; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 240; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 241; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 242; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 243; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 244; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 245; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 246; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 247; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 248; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 249; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 250; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 251; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 252; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 253; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 254; flag : umf_noinfo; reserved: 0),
|
|
(unicode : 255; flag : umf_noinfo; reserved: 0)
|
|
);
|
|
|
|
unicodemap : tunicodemap = (
|
|
cpname : '8859-1';
|
|
cp : 28591;
|
|
map : @map;
|
|
lastchar : 255;
|
|
next : nil;
|
|
internalmap : true
|
|
);
|
|
|
|
var
|
|
hp : punicodemap;
|
|
|
|
initialization
|
|
mappings:=nil;
|
|
registermapping(@unicodemap)
|
|
finalization
|
|
while assigned(mappings) do
|
|
begin
|
|
hp:=mappings^.next;
|
|
if not(mappings^.internalmap) then
|
|
begin
|
|
freemem(mappings^.map);
|
|
dispose(mappings);
|
|
end;
|
|
mappings:=hp;
|
|
end;
|
|
end.
|