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/*
* Copyright (C) 1999-2001 Free Software Foundation, Inc.
* This file is part of the GNU LIBICONV Library.
*
* The GNU LIBICONV Library is free software; you can redistribute it
* and/or modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* The GNU LIBICONV Library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with the GNU LIBICONV Library; see the file COPYING.LIB.
* If not, write to the Free Software Foundation, Inc., 59 Temple Place -
* Suite 330, Boston, MA 02111-1307, USA.
*/
/*
* GBK
*/
/*
* GBK, as described in Ken Lunde's book, is an extension of GB 2312-1980
* (shifted by adding 0x8080 to the range 0xA1A1..0xFEFE, as used in EUC-CN).
* It adds the following ranges:
*
* (part of GBK/1) 0xA2A1-0xA2AA Small Roman numerals
* GBK/3 0x{81-A0}{40-7E,80-FE} 6080 new characters, all in Unicode
* GBK/4 0x{AA-FE}{40-7E,80-A0} 8160 new characters, 8080 in Unicode
* GBK/5 0x{A8-A9}{40-7E,80-A0} 166 new characters, 153 in Unicode
*/
/*
* CP936 is nearly identical to GBK. It differs as follows:
*
* 1. Some characters in the GB2312 range are defined differently:
*
* code GB2312 CP936.TXT
* 0xA1A4 0x30FB # KATAKANA MIDDLE DOT 0x00B7 # MIDDLE DOT
* 0xA1AA 0x2015 # HORIZONTAL BAR 0x2014 # EM DASH
*
* 2. 19 characters added in the range 0xA6E0-0xA6F5.
*
* 3. 4 characters added in the range 0xA8BB-0xA8C0.
*/
/*
* Since all three tables I have looked at
* - the CP936 table by Microsoft, found on ftp.unicode.org,
* - the GBK table by Sun, investigated on a Solaris 2.7 machine,
* - the GBK tables by CWEX, found in the Big5+ package,
* all include these CP936 extensions (the CWEX tables have additional
* differences), I conclude that either Ken Lunde has overlooked some of
* the differences between GB2312 and GBK, or he is right but the major
* vendors don't care about it. In either case, CP936 is the de facto
* standard under the name "GBK", and we should better support it.
*
* So in what follows, when we write "GBK" we always mean "CP936".
*/
#include "gbkext1.h"
#include "gbkext2.h"
#include "gbkext_inv.h"
#include "cp936ext.h"
static int
gbk_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, int n)
{
unsigned char c = *s;
if (c >= 0x81 && c < 0xff) {
if (n < 2)
return RET_TOOFEW(0);
if (c >= 0xa1 && c <= 0xf7) {
unsigned char c2 = s[1];
if (c == 0xa1) {
if (c2 == 0xa4) {
*pwc = 0x00b7;
return 2;
}
if (c2 == 0xaa) {
*pwc = 0x2014;
return 2;
}
}
if (c2 >= 0xa1 && c2 < 0xff) {
unsigned char buf[2];
int ret;
buf[0] = c-0x80; buf[1] = c2-0x80;
ret = gb2312_mbtowc(conv,pwc,buf,2);
if (ret != RET_ILSEQ)
return ret;
buf[0] = c; buf[1] = c2;
ret = cp936ext_mbtowc(conv,pwc,buf,2);
if (ret != RET_ILSEQ)
return ret;
}
}
if (c >= 0x81 && c <= 0xa0)
return gbkext1_mbtowc(conv,pwc,s,2);
if (c >= 0xa8 && c <= 0xfe)
return gbkext2_mbtowc(conv,pwc,s,2);
if (c == 0xa2) {
unsigned char c2 = s[1];
if (c2 >= 0xa1 && c2 <= 0xaa) {
*pwc = 0x2170+(c2-0xa1);
return 2;
}
}
}
return RET_ILSEQ;
}
static int
gbk_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, int n)
{
unsigned char buf[2];
int ret;
if (wc != 0x30fb && wc != 0x2015) {
ret = gb2312_wctomb(conv,buf,wc,2);
if (ret != RET_ILUNI) {
if (ret != 2) abort();
if (n < 2)
return RET_TOOSMALL;
r[0] = buf[0]+0x80;
r[1] = buf[1]+0x80;
return 2;
}
}
ret = gbkext_inv_wctomb(conv,buf,wc,2);
if (ret != RET_ILUNI) {
if (ret != 2) abort();
if (n < 2)
return RET_TOOSMALL;
r[0] = buf[0];
r[1] = buf[1];
return 2;
}
if (wc >= 0x2170 && wc <= 0x2179) {
r[0] = 0xa2;
r[1] = 0xa1 + (wc-0x2170);
return 2;
}
ret = cp936ext_wctomb(conv,buf,wc,2);
if (ret != RET_ILUNI) {
if (ret != 2) abort();
if (n < 2)
return RET_TOOSMALL;
r[0] = buf[0];
r[1] = buf[1];
return 2;
}
if (wc == 0x00b7) {
if (n < 2)
return RET_TOOSMALL;
r[0] = 0xa1;
r[1] = 0xa4;
return 2;
}
if (wc == 0x2014) {
if (n < 2)
return RET_TOOSMALL;
r[0] = 0xa1;
r[1] = 0xaa;
return 2;
}
return RET_ILUNI;
}
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