/* | |

* Copyright (C) 2005, 2016 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 Lesser General Public | |

* License as published by the Free Software Foundation; either version 2.1 | |

* 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 | |

* Lesser General Public License for more details. | |

* | |

* You should have received a copy of the GNU Lesser General Public | |

* License along with the GNU LIBICONV Library; see the file COPYING.LIB. | |

* If not, see <https://www.gnu.org/licenses/>. | |

*/ | |

/* | |

* CP936 | |

*/ | |

/* | |

* The IANA has CP936 as an alias of GBK. But GBK is an official Chinese | |

* specification, whereas CP936 is de-facto maintained by Microsoft. And, | |

* of course, Microsoft modified CP936 since 1999. | |

* | |

* The differences from GBK are: | |

* | |

* 1. A single character: | |

* | |

* code CP936.TXT | |

* 0x80 0x20AC # EURO SIGN | |

* | |

* Some variants of CP936 (in JDK, Windows-2000, ICU) also add: | |

* | |

* 2. Private area mappings: | |

* | |

* code Unicode | |

* 0x{A1..A2}{40..7E,80..A0} U+E4C6..U+E585 | |

* 0x{AA..AF,F8..FE}{A1..FE} U+E000..U+E4C5 | |

* | |

* We add them too because, although there are backward compatibility problems | |

* when a character from a private area is moved to an official Unicode code | |

* point, they are useful for some people in practice. | |

*/ | |

static int | |

cp936_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n) | |

{ | |

/* Try GBK first. */ | |

{ | |

int ret = ces_gbk_mbtowc(conv,pwc,s,n); | |

if (ret != RET_ILSEQ) | |

return ret; | |

} | |

/* Then handle the additional mappings. */ | |

{ | |

unsigned char c = *s; | |

if (c == 0x80) { | |

*pwc = 0x20ac; | |

return 1; | |

} | |

/* User-defined characters */ | |

if (c >= 0xa1 && c <= 0xa2) { | |

if (n < 2) | |

return RET_TOOFEW(0); | |

{ | |

unsigned char c2 = s[1]; | |

if ((c2 >= 0x40 && c2 < 0x7f) || (c2 >= 0x80 && c2 < 0xa1)) { | |

*pwc = 0xe4c6 + 96 * (c - 0xa1) + (c2 - (c2 >= 0x80 ? 0x41 : 0x40)); | |

return 2; | |

} | |

} | |

} else if ((c >= 0xaa && c < 0xb0) || (c >= 0xf8 && c < 0xff)) { | |

if (n < 2) | |

return RET_TOOFEW(0); | |

{ | |

unsigned char c2 = s[1]; | |

if (c2 >= 0xa1 && c2 < 0xff) { | |

*pwc = 0xe000 + 94 * (c - (c >= 0xf8 ? 0xf2 : 0xaa)) + (c2 - 0xa1); | |

return 2; | |

} | |

} | |

} | |

} | |

return RET_ILSEQ; | |

} | |

static int | |

cp936_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n) | |

{ | |

/* Try GBK first. */ | |

{ | |

int ret = ces_gbk_wctomb(conv,r,wc,n); | |

if (ret != RET_ILUNI) | |

return ret; | |

} | |

/* Then handle the additional mappings. */ | |

if (wc >= 0xe000 && wc < 0xe586) { | |

/* User-defined characters */ | |

if (n < 2) | |

return RET_TOOFEW(0); | |

if (wc < 0xe4c6) { | |

unsigned int i = wc - 0xe000; | |

unsigned int c1 = i / 94; | |

unsigned int c2 = i % 94; | |

r[0] = c1 + (c1 < 6 ? 0xaa : 0xf2); | |

r[1] = c2 + 0xa1; | |

return 2; | |

} else { | |

unsigned int i = wc - 0xe4c6; | |

unsigned int c1 = i / 96; | |

unsigned int c2 = i % 96; | |

r[0] = c1 + 0xa1; | |

r[1] = c2 + (c2 < 0x3f ? 0x40 : 0x41); | |

return 2; | |

} | |

} else if (wc == 0x20ac) { | |

r[0] = 0x80; | |

return 1; | |

} | |

return RET_ILUNI; | |

} |