/* | |

* 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; | |

} |