3 exFAT file system implementation library.
5 Free exFAT implementation.
6 Copyright (C) 2010-2017 Andrew Nayenko
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation, either version 2 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License along
19 with this program; if not, write to the Free Software Foundation, Inc.,
20 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
26 static char* wchar_to_utf8(char* output, wchar_t wc, size_t outsize)
32 *output++ = (char) wc;
38 *output++ = 0xc0 | (wc >> 6);
39 *output++ = 0x80 | (wc & 0x3f);
41 else if (wc <= 0xffff)
45 *output++ = 0xe0 | (wc >> 12);
46 *output++ = 0x80 | ((wc >> 6) & 0x3f);
47 *output++ = 0x80 | (wc & 0x3f);
49 else if (wc <= 0x1fffff)
53 *output++ = 0xf0 | (wc >> 18);
54 *output++ = 0x80 | ((wc >> 12) & 0x3f);
55 *output++ = 0x80 | ((wc >> 6) & 0x3f);
56 *output++ = 0x80 | (wc & 0x3f);
58 else if (wc <= 0x3ffffff)
62 *output++ = 0xf8 | (wc >> 24);
63 *output++ = 0x80 | ((wc >> 18) & 0x3f);
64 *output++ = 0x80 | ((wc >> 12) & 0x3f);
65 *output++ = 0x80 | ((wc >> 6) & 0x3f);
66 *output++ = 0x80 | (wc & 0x3f);
68 else if (wc <= 0x7fffffff)
72 *output++ = 0xfc | (wc >> 30);
73 *output++ = 0x80 | ((wc >> 24) & 0x3f);
74 *output++ = 0x80 | ((wc >> 18) & 0x3f);
75 *output++ = 0x80 | ((wc >> 12) & 0x3f);
76 *output++ = 0x80 | ((wc >> 6) & 0x3f);
77 *output++ = 0x80 | (wc & 0x3f);
85 static const le16_t* utf16_to_wchar(const le16_t* input, wchar_t* wc,
88 if ((le16_to_cpu(input[0]) & 0xfc00) == 0xd800)
90 if (insize < 2 || (le16_to_cpu(input[1]) & 0xfc00) != 0xdc00)
92 *wc = ((wchar_t) (le16_to_cpu(input[0]) & 0x3ff) << 10);
93 *wc |= (le16_to_cpu(input[1]) & 0x3ff);
99 *wc = le16_to_cpu(*input);
104 int utf16_to_utf8(char* output, const le16_t* input, size_t outsize,
107 const le16_t* inp = input;
111 while (inp - input < insize)
113 inp = utf16_to_wchar(inp, &wc, insize - (inp - input));
116 exfat_error("illegal UTF-16 sequence");
119 outp = wchar_to_utf8(outp, wc, outsize - (outp - output));
122 exfat_error("name is too long");
123 return -ENAMETOOLONG;
128 if (outp - output >= outsize)
130 exfat_error("name is too long");
131 return -ENAMETOOLONG;
137 static const char* utf8_to_wchar(const char* input, wchar_t* wc,
140 if ((input[0] & 0x80) == 0 && insize >= 1)
142 *wc = (wchar_t) input[0];
145 if ((input[0] & 0xe0) == 0xc0 && insize >= 2)
147 *wc = (((wchar_t) input[0] & 0x1f) << 6) |
148 ((wchar_t) input[1] & 0x3f);
151 if ((input[0] & 0xf0) == 0xe0 && insize >= 3)
153 *wc = (((wchar_t) input[0] & 0x0f) << 12) |
154 (((wchar_t) input[1] & 0x3f) << 6) |
155 ((wchar_t) input[2] & 0x3f);
158 if ((input[0] & 0xf8) == 0xf0 && insize >= 4)
160 *wc = (((wchar_t) input[0] & 0x07) << 18) |
161 (((wchar_t) input[1] & 0x3f) << 12) |
162 (((wchar_t) input[2] & 0x3f) << 6) |
163 ((wchar_t) input[3] & 0x3f);
166 if ((input[0] & 0xfc) == 0xf8 && insize >= 5)
168 *wc = (((wchar_t) input[0] & 0x03) << 24) |
169 (((wchar_t) input[1] & 0x3f) << 18) |
170 (((wchar_t) input[2] & 0x3f) << 12) |
171 (((wchar_t) input[3] & 0x3f) << 6) |
172 ((wchar_t) input[4] & 0x3f);
175 if ((input[0] & 0xfe) == 0xfc && insize >= 6)
177 *wc = (((wchar_t) input[0] & 0x01) << 30) |
178 (((wchar_t) input[1] & 0x3f) << 24) |
179 (((wchar_t) input[2] & 0x3f) << 18) |
180 (((wchar_t) input[3] & 0x3f) << 12) |
181 (((wchar_t) input[4] & 0x3f) << 6) |
182 ((wchar_t) input[5] & 0x3f);
188 static le16_t* wchar_to_utf16(le16_t* output, wchar_t wc, size_t outsize)
190 if (wc <= 0xffff) /* if character is from BMP */
194 output[0] = cpu_to_le16(wc);
200 output[0] = cpu_to_le16(0xd800 | ((wc >> 10) & 0x3ff));
201 output[1] = cpu_to_le16(0xdc00 | (wc & 0x3ff));
205 int utf8_to_utf16(le16_t* output, const char* input, size_t outsize,
208 const char* inp = input;
209 le16_t* outp = output;
212 while (inp - input < insize)
214 inp = utf8_to_wchar(inp, &wc, insize - (inp - input));
217 exfat_error("illegal UTF-8 sequence");
220 outp = wchar_to_utf16(outp, wc, outsize - (outp - output));
223 exfat_error("name is too long");
224 return -ENAMETOOLONG;
229 if (outp - output >= outsize)
231 exfat_error("name is too long");
232 return -ENAMETOOLONG;
234 *outp = cpu_to_le16(0);
238 size_t utf16_length(const le16_t* str)
242 while (le16_to_cpu(str[i]))