| /* |
| * Copyright (C) 1999-2001, 2008, 2011, 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/>. |
| */ |
| |
| /* |
| * UCS-2 |
| */ |
| |
| /* Here we accept FFFE/FEFF marks as endianness indicators everywhere |
| in the stream, not just at the beginning. The default is big-endian. */ |
| /* The state is 0 if big-endian, 1 if little-endian. */ |
| static int |
| ucs2_mbtowc (conv_t conv, ucs4_t *pwc, const unsigned char *s, size_t n) |
| { |
| state_t state = conv->istate; |
| int count = 0; |
| for (; n >= 2 && count <= RET_COUNT_MAX && count <= INT_MAX-2;) { |
| ucs4_t wc = (state ? s[0] + (s[1] << 8) : (s[0] << 8) + s[1]); |
| if (wc == 0xfeff) { |
| } else if (wc == 0xfffe) { |
| state ^= 1; |
| } else if (wc >= 0xd800 && wc < 0xe000) { |
| conv->istate = state; |
| return RET_SHIFT_ILSEQ(count); |
| } else { |
| *pwc = wc; |
| conv->istate = state; |
| return count+2; |
| } |
| s += 2; n -= 2; count += 2; |
| } |
| conv->istate = state; |
| return RET_TOOFEW(count); |
| } |
| |
| /* But we output UCS-2 in big-endian order, without byte-order mark. */ |
| /* RFC 2152 says: |
| "ISO/IEC 10646-1:1993(E) specifies that when characters the UCS-2 form are |
| serialized as octets, that the most significant octet appear first." */ |
| static int |
| ucs2_wctomb (conv_t conv, unsigned char *r, ucs4_t wc, size_t n) |
| { |
| if (wc < 0x10000 && wc != 0xfffe && !(wc >= 0xd800 && wc < 0xe000)) { |
| if (n >= 2) { |
| r[0] = (unsigned char) (wc >> 8); |
| r[1] = (unsigned char) wc; |
| return 2; |
| } else |
| return RET_TOOSMALL; |
| } else |
| return RET_ILUNI; |
| } |