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/**
* Yudit Unicode Editor Source File
*
* GNU Copyright (C) 1997-2023 Gaspar Sinai <gaspar@yudit.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2,
* dated June 1991. See file COPYYING for details.
*
* 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.
*/
#include "stoolkit/sencoder/SB_X11_KSC.h"
#include "stoolkit/SString.h"
#include "stoolkit/SStringVector.h"
#define SS_ESC 27
/**
* This is a sample (base) implementation of the core encoding class
* @author: Gaspar Sinai <gaspar@yudit.org>
* @version: 2000-05-12
* E2 80 A8 E2 80 A9 are paragraph and line seps in utf-8 (U+20A8, U+20A9)
*/
SB_X11_KSC::SB_X11_KSC() : SBEncoder ("\n,\r\n,\r"), ksc_5601_r ("ksc-5601-r")
{
ok = ksc_5601_r.isOK();
}
SB_X11_KSC::~SB_X11_KSC ()
{
}
/**
* return false if this generic encoder does not exist.
*/
bool
SB_X11_KSC::isOK() const
{
return ok;
}
/**
* This is encoding a unicode string into a bytestring
* @param input is a unicode string.
*/
const SString&
SB_X11_KSC::encode (const SV_UCS4& input)
{
const SS_UCS4* in = input.array();
sstring.clear();
sstring.ensure(input.size()*2);
SS_UCS2 got;
SUniMap* current=0;
for (unsigned int i=0; i<input.size(); i++)
{
if (in[i] < 0x80)
{
if (current != 0)
{
sstring.append ((char) SS_ESC);
sstring.append ((char) '(');
sstring.append ((char) 'B');
}
current=0;
sstring.append ((char) in[i]);
continue;
}
if (ksc_5601_r.isOK() && (got=ksc_5601_r.encode (in[i])) != 0)
{
if ((got&0xff00) > 0xa000 && (got&0xff00) < 0xff00
&& (got&0xff) > 0xa0 && (got&0xff) < 0xff)
{
if (current==0)
{
sstring.append ((char) SS_ESC);
sstring.append ((char) '$');
sstring.append ((char) '(');
sstring.append ((char) 'C');
}
current=&ksc_5601_r;
sstring.append ((char) ((got&0x7f00)>>8));
sstring.append ((char) (got&0x7f));
continue;
}
}
quoteString (in[i]);
}
if (current != 0)
{
sstring.append ((char) SS_ESC);
sstring.append ((char) '(');
sstring.append ((char) 'B');
}
return sstring;
}
/**
* Decode an input string into a unicode string.
* @param input is a string.
* he output can be null, in this case a line is not
* read fully. If input size is zero output will be flushed.
*/
const SV_UCS4&
SB_X11_KSC::decode (const SString& input)
{
const unsigned char* in = (unsigned char*) input.array();
ucs4string.clear();
ucs4string.ensure(input.size());
SS_UCS4 got;
SUniMap* current=0;
for (unsigned i=0; i<input.size(); i++)
{
if (input.size() > i+3 && in[i] == SS_ESC
&& in[i+1] == '$'
&& in[i+2] == '('
&& in[i+3] == 'C')
{
current=&ksc_5601_r; // Korean
i++; i++; i++;
continue;
}
if (input.size() > i+2 && in[i] == SS_ESC && in[i+1] == '('
&& in[i+2] == 'B')
{
current=0; // ASCII
i++; i++;
continue;
}
if (input.size() > i+3 && in[i] == SS_ESC && in[i+1] == '('
&& in[i+2] == 'A' && in[i+3] > 0x20 && in[i+3] <0x7f)
{
current=0; // 1 byte ASCII
i++; i++; i++;
ucs4string.append ((SS_UCS4) in[i]);
continue;
}
// It should not happen but it does.
if (in[i] < ' ') current=0;
if (current!=0)
{
if ( input.size() > i+1 && in[i]>0x20 && in[i] < 0x7F
&& in[i+1] > 0x20 && in[i+1] < 0x7F)
{
got = current->decode (((((SS_UCS2)in[i]<< 8) | in[i+1]) | 0x8080 )) ;
}
else
{
got = 0;
}
if (got != 0)
{
ucs4string.append (got);
}
else
{
quoteUCS4 ((unsigned char) in[i]);
quoteUCS4 ((unsigned char) in[i+1]);
}
i++;
continue;
}
ucs4string.append ((SS_UCS4) in[i]);
continue;
}
return ucs4string;
}
/**
* These methods guess the line delimiters for the input
* The one without arguments is giving the 'first approximation'
* It returns an inclusive list of all possibilities.
*/
const SStringVector&
SB_X11_KSC::delimiters ()
{
return realDelimiters;
}
/**
* These methods guess the line delimiters for the input
* The one without arguments is giving the 'first approximation'
* It returns an exact list
*/
const SStringVector&
SB_X11_KSC::delimiters (const SString& sample)
{
return sampleDelimiters;
}
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