| /* |
| * UTF-16 |
| */ |
| |
| /* 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 |
| utf16_mbtowc (conv_t conv, wchar_t *pwc, const unsigned char *s, int n) |
| { |
| state_t state = conv->istate; |
| int count = 0; |
| for (; n >= 2;) { |
| wchar_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 < 0xdc00) { |
| if (n >= 4) { |
| wchar_t wc2 = (state ? s[2] + (s[3] << 8) : (s[2] << 8) + s[3]); |
| if (!(wc2 >= 0xdc00 && wc2 < 0xe000)) |
| return RET_ILSEQ; |
| *pwc = 0x10000 + ((wc - 0xd800) << 10) + (wc2 - 0xdc00); |
| conv->istate = state; |
| return count+4; |
| } else |
| break; |
| } else if (wc >= 0xdc00 && wc < 0xe000) { |
| return RET_ILSEQ; |
| } 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 UTF-16 in big-endian order, without byte-order mark. */ |
| static int |
| utf16_wctomb (conv_t conv, unsigned char *r, wchar_t wc, int n) |
| { |
| if (wc != 0xfffe) { |
| if (wc < 0x10000) { |
| if (n >= 2) { |
| r[0] = (unsigned char) (wc >> 8); |
| r[1] = (unsigned char) wc; |
| return 2; |
| } else |
| return RET_TOOSMALL; |
| } |
| else if (wc < 0x110000) { |
| if (n >= 4) { |
| wchar_t wc1 = 0xd800 + ((wc - 0x10000) >> 10); |
| wchar_t wc2 = 0xdc00 + ((wc - 0x10000) & 0x3ff); |
| r[0] = (unsigned char) (wc1 >> 8); |
| r[1] = (unsigned char) wc1; |
| r[2] = (unsigned char) (wc2 >> 8); |
| r[3] = (unsigned char) wc2; |
| return 4; |
| } else |
| return RET_TOOSMALL; |
| } |
| } |
| return RET_ILSEQ; |
| } |