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{
This file is part of the Free Pascal run time library.
Copyright (c) 2000 by Florian Klaempfl
member of the Free Pascal development team.
This unit implements several classes for charset conversions
See the file COPYING.FPC, included in this distribution,
for details about the copyright.
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.
**********************************************************************
}
unit charset;
{$i fpcdefs.inc}
interface
type
tunicodechar = word;
tunicodestring = ^tunicodechar;
tcsconvert = class
// !!!!!!1constructor create;
end;
tunicodecharmappingflag = (umf_noinfo,umf_leadbyte,umf_undefined,
umf_unused);
punicodecharmapping = ^tunicodecharmapping;
tunicodecharmapping = record
unicode : tunicodechar;
flag : tunicodecharmappingflag;
reserved : byte;
end;
punicodemap = ^tunicodemap;
tunicodemap = record
cpname : string[20];
map : punicodecharmapping;
lastchar : longint;
next : punicodemap;
internalmap : boolean;
end;
tcp2unicode = class(tcsconvert)
end;
function loadunicodemapping(const cpname,f : string) : punicodemap;
procedure registermapping(p : punicodemap);
function getmap(const s : string) : punicodemap;
function mappingavailable(const s : string) : boolean;
function getunicode(c : char;p : punicodemap) : tunicodechar;
function getascii(c : tunicodechar;p : punicodemap) : string;
implementation
var
mappings : punicodemap;
function loadunicodemapping(const cpname,f : string) : punicodemap;
var
data : punicodecharmapping;
datasize : longint;
t : text;
s,hs : string;
scanpos,charpos,unicodevalue : longint;
code : integer;
flag : tunicodecharmappingflag;
p : punicodemap;
lastchar : longint;
begin
lastchar:=-1;
loadunicodemapping:=nil;
datasize:=256;
getmem(data,sizeof(tunicodecharmapping)*datasize);
assign(t,f);
{$I-}
reset(t);
{$I+}
if ioresult<>0 then
begin
freemem(data,sizeof(tunicodecharmapping)*datasize);
exit;
end;
while not(eof(t)) do
begin
readln(t,s);
if (s[1]='0') and (s[2]='x') then
begin
flag:=umf_unused;
scanpos:=3;
hs:='$';
while s[scanpos] in ['0'..'9','A'..'F','a'..'f'] do
begin
hs:=hs+s[scanpos];
inc(scanpos);
end;
val(hs,charpos,code);
if code<>0 then
begin
freemem(data,sizeof(tunicodecharmapping)*datasize);
close(t);
exit;
end;
while not(s[scanpos] in ['0','#']) do
inc(scanpos);
if s[scanpos]='#' then
begin
{ special char }
unicodevalue:=$ffff;
hs:=copy(s,scanpos,length(s)-scanpos+1);
if hs='#DBCS LEAD BYTE' then
flag:=umf_leadbyte;
end
else
begin
{ C hex prefix }
inc(scanpos,2);
hs:='$';
while s[scanpos] in ['0'..'9','A'..'F','a'..'f'] do
begin
hs:=hs+s[scanpos];
inc(scanpos);
end;
val(hs,unicodevalue,code);
if code<>0 then
begin
freemem(data,sizeof(tunicodecharmapping)*datasize);
close(t);
exit;
end;
if charpos>datasize then
begin
{ allocate 1024 bytes more because }
{ if we need more than 256 entries it's }
{ probably a mbcs with a lot of }
{ entries }
datasize:=charpos+1024;
reallocmem(data,sizeof(tunicodecharmapping)*datasize);
end;
flag:=umf_noinfo;
end;
data[charpos].flag:=flag;
data[charpos].unicode:=unicodevalue;
if charpos>lastchar then
lastchar:=charpos;
end;
end;
close(t);
new(p);
p^.lastchar:=lastchar;
p^.cpname:=cpname;
p^.internalmap:=false;
p^.next:=nil;
p^.map:=data;
loadunicodemapping:=p;
end;
procedure registermapping(p : punicodemap);
begin
p^.next:=mappings;
mappings:=p;
end;
function getmap(const s : string) : punicodemap;
var
hp : punicodemap;
const
mapcache : string = '';
mapcachep : punicodemap = nil;
begin
if (mapcache=s) and (mapcachep^.cpname=s) then
begin
getmap:=mapcachep;
exit;
end;
hp:=mappings;
while assigned(hp) do
begin
if hp^.cpname=s then
begin
getmap:=hp;
mapcache:=s;
mapcachep:=hp;
exit;
end;
hp:=hp^.next;
end;
getmap:=nil;
end;
function mappingavailable(const s : string) : boolean;
begin
mappingavailable:=getmap(s)<>nil;
end;
function getunicode(c : char;p : punicodemap) : tunicodechar;
begin
if ord(c)<=p^.lastchar then
getunicode:=p^.map[ord(c)].unicode
else
getunicode:=0;
end;
function getascii(c : tunicodechar;p : punicodemap) : string;
var
i : longint;
begin
{ at least map to space }
getascii:=#32;
for i:=0 to p^.lastchar do
if p^.map[i].unicode=c then
begin
if i<256 then
getascii:=chr(i)
else
getascii:=chr(i div 256)+chr(i mod 256);
exit;
end;
end;
var
hp : punicodemap;
initialization
mappings:=nil;
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.
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