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Signed-off-by: Namjae Jeon Signed-off-by: Sungjong Seo Reviewed-by: Pali Rohár --- fs/exfat/nls.c | 834 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 834 insertions(+) create mode 100644 fs/exfat/nls.c diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c new file mode 100644 index 000000000000..65931b8cdcb7 --- /dev/null +++ b/fs/exfat/nls.c @@ -0,0 +1,834 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Copyright (C) 2012-2013 Samsung Electronics Co., Ltd. + */ + +#include +#include +#include +#include + +#include "exfat_raw.h" +#include "exfat_fs.h" + +/* Upcase tabel macro */ +#define EXFAT_NUM_UPCASE (2918) +#define UTBL_COUNT (0x10000) + +/* + * Upcase table in compressed format (7.2.5.1 Recommended Up-case Table + * in exfat specification, See: + * https://docs.microsoft.com/en-us/windows/win32/fileio/exfat-specification). + */ +static const unsigned short uni_def_upcase[EXFAT_NUM_UPCASE] = { + 0x0000, 0x0001, 0x0002, 0x0003, 0x0004, 0x0005, 0x0006, 0x0007, + 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0x1f8c, 0x1f8d, 0x1f8e, 0x1f8f, 0x1f98, 0x1f99, 0x1f9a, 0x1f9b, + 0x1f9c, 0x1f9d, 0x1f9e, 0x1f9f, 0x1f98, 0x1f99, 0x1f9a, 0x1f9b, + 0x1f9c, 0x1f9d, 0x1f9e, 0x1f9f, 0x1fa8, 0x1fa9, 0x1faa, 0x1fab, + 0x1fac, 0x1fad, 0x1fae, 0x1faf, 0x1fa8, 0x1fa9, 0x1faa, 0x1fab, + 0x1fac, 0x1fad, 0x1fae, 0x1faf, 0x1fb8, 0x1fb9, 0x1fb2, 0x1fbc, + 0x1fb4, 0x1fb5, 0x1fb6, 0x1fb7, 0x1fb8, 0x1fb9, 0x1fba, 0x1fbb, + 0x1fbc, 0x1fbd, 0x1fbe, 0x1fbf, 0x1fc0, 0x1fc1, 0x1fc2, 0x1fc3, + 0x1fc4, 0x1fc5, 0x1fc6, 0x1fc7, 0x1fc8, 0x1fc9, 0x1fca, 0x1fcb, + 0x1fc3, 0x1fcd, 0x1fce, 0x1fcf, 0x1fd8, 0x1fd9, 0x1fd2, 0x1fd3, + 0x1fd4, 0x1fd5, 0x1fd6, 0x1fd7, 0x1fd8, 0x1fd9, 0x1fda, 0x1fdb, + 0x1fdc, 0x1fdd, 0x1fde, 0x1fdf, 0x1fe8, 0x1fe9, 0x1fe2, 0x1fe3, + 0x1fe4, 0x1fec, 0x1fe6, 0x1fe7, 0x1fe8, 0x1fe9, 0x1fea, 0x1feb, + 0x1fec, 0x1fed, 0x1fee, 0x1fef, 0x1ff0, 0x1ff1, 0x1ff2, 0x1ff3, + 0x1ff4, 0x1ff5, 0x1ff6, 0x1ff7, 0x1ff8, 0x1ff9, 0x1ffa, 0x1ffb, + 0x1ff3, 0x1ffd, 0x1ffe, 0x1fff, 0x2000, 0x2001, 0x2002, 0x2003, + 0x2004, 0x2005, 0x2006, 0x2007, 0x2008, 0x2009, 0x200a, 0x200b, + 0x200c, 0x200d, 0x200e, 0x200f, 0x2010, 0x2011, 0x2012, 0x2013, + 0x2014, 0x2015, 0x2016, 0x2017, 0x2018, 0x2019, 0x201a, 0x201b, + 0x201c, 0x201d, 0x201e, 0x201f, 0x2020, 0x2021, 0x2022, 0x2023, + 0x2024, 0x2025, 0x2026, 0x2027, 0x2028, 0x2029, 0x202a, 0x202b, + 0x202c, 0x202d, 0x202e, 0x202f, 0x2030, 0x2031, 0x2032, 0x2033, + 0x2034, 0x2035, 0x2036, 0x2037, 0x2038, 0x2039, 0x203a, 0x203b, + 0x203c, 0x203d, 0x203e, 0x203f, 0x2040, 0x2041, 0x2042, 0x2043, + 0x2044, 0x2045, 0x2046, 0x2047, 0x2048, 0x2049, 0x204a, 0x204b, + 0x204c, 0x204d, 0x204e, 0x204f, 0x2050, 0x2051, 0x2052, 0x2053, + 0x2054, 0x2055, 0x2056, 0x2057, 0x2058, 0x2059, 0x205a, 0x205b, + 0x205c, 0x205d, 0x205e, 0x205f, 0x2060, 0x2061, 0x2062, 0x2063, + 0x2064, 0x2065, 0x2066, 0x2067, 0x2068, 0x2069, 0x206a, 0x206b, + 0x206c, 0x206d, 0x206e, 0x206f, 0x2070, 0x2071, 0x2072, 0x2073, + 0x2074, 0x2075, 0x2076, 0x2077, 0x2078, 0x2079, 0x207a, 0x207b, + 0x207c, 0x207d, 0x207e, 0x207f, 0x2080, 0x2081, 0x2082, 0x2083, + 0x2084, 0x2085, 0x2086, 0x2087, 0x2088, 0x2089, 0x208a, 0x208b, + 0x208c, 0x208d, 0x208e, 0x208f, 0x2090, 0x2091, 0x2092, 0x2093, + 0x2094, 0x2095, 0x2096, 0x2097, 0x2098, 0x2099, 0x209a, 0x209b, + 0x209c, 0x209d, 0x209e, 0x209f, 0x20a0, 0x20a1, 0x20a2, 0x20a3, + 0x20a4, 0x20a5, 0x20a6, 0x20a7, 0x20a8, 0x20a9, 0x20aa, 0x20ab, + 0x20ac, 0x20ad, 0x20ae, 0x20af, 0x20b0, 0x20b1, 0x20b2, 0x20b3, + 0x20b4, 0x20b5, 0x20b6, 0x20b7, 0x20b8, 0x20b9, 0x20ba, 0x20bb, + 0x20bc, 0x20bd, 0x20be, 0x20bf, 0x20c0, 0x20c1, 0x20c2, 0x20c3, + 0x20c4, 0x20c5, 0x20c6, 0x20c7, 0x20c8, 0x20c9, 0x20ca, 0x20cb, + 0x20cc, 0x20cd, 0x20ce, 0x20cf, 0x20d0, 0x20d1, 0x20d2, 0x20d3, + 0x20d4, 0x20d5, 0x20d6, 0x20d7, 0x20d8, 0x20d9, 0x20da, 0x20db, + 0x20dc, 0x20dd, 0x20de, 0x20df, 0x20e0, 0x20e1, 0x20e2, 0x20e3, + 0x20e4, 0x20e5, 0x20e6, 0x20e7, 0x20e8, 0x20e9, 0x20ea, 0x20eb, + 0x20ec, 0x20ed, 0x20ee, 0x20ef, 0x20f0, 0x20f1, 0x20f2, 0x20f3, + 0x20f4, 0x20f5, 0x20f6, 0x20f7, 0x20f8, 0x20f9, 0x20fa, 0x20fb, + 0x20fc, 0x20fd, 0x20fe, 0x20ff, 0x2100, 0x2101, 0x2102, 0x2103, + 0x2104, 0x2105, 0x2106, 0x2107, 0x2108, 0x2109, 0x210a, 0x210b, + 0x210c, 0x210d, 0x210e, 0x210f, 0x2110, 0x2111, 0x2112, 0x2113, + 0x2114, 0x2115, 0x2116, 0x2117, 0x2118, 0x2119, 0x211a, 0x211b, + 0x211c, 0x211d, 0x211e, 0x211f, 0x2120, 0x2121, 0x2122, 0x2123, + 0x2124, 0x2125, 0x2126, 0x2127, 0x2128, 0x2129, 0x212a, 0x212b, + 0x212c, 0x212d, 0x212e, 0x212f, 0x2130, 0x2131, 0x2132, 0x2133, + 0x2134, 0x2135, 0x2136, 0x2137, 0x2138, 0x2139, 0x213a, 0x213b, + 0x213c, 0x213d, 0x213e, 0x213f, 0x2140, 0x2141, 0x2142, 0x2143, + 0x2144, 0x2145, 0x2146, 0x2147, 0x2148, 0x2149, 0x214a, 0x214b, + 0x214c, 0x214d, 0x2132, 0x214f, 0x2150, 0x2151, 0x2152, 0x2153, + 0x2154, 0x2155, 0x2156, 0x2157, 0x2158, 0x2159, 0x215a, 0x215b, + 0x215c, 0x215d, 0x215e, 0x215f, 0x2160, 0x2161, 0x2162, 0x2163, + 0x2164, 0x2165, 0x2166, 0x2167, 0x2168, 0x2169, 0x216a, 0x216b, + 0x216c, 0x216d, 0x216e, 0x216f, 0x2160, 0x2161, 0x2162, 0x2163, + 0x2164, 0x2165, 0x2166, 0x2167, 0x2168, 0x2169, 0x216a, 0x216b, + 0x216c, 0x216d, 0x216e, 0x216f, 0x2180, 0x2181, 0x2182, 0x2183, + 0x2183, 0xffff, 0x034b, 0x24b6, 0x24b7, 0x24b8, 0x24b9, 0x24ba, + 0x24bb, 0x24bc, 0x24bd, 0x24be, 0x24bf, 0x24c0, 0x24c1, 0x24c2, + 0x24c3, 0x24c4, 0x24c5, 0x24c6, 0x24c7, 0x24c8, 0x24c9, 0x24ca, + 0x24cb, 0x24cc, 0x24cd, 0x24ce, 0x24cf, 0xffff, 0x0746, 0x2c00, + 0x2c01, 0x2c02, 0x2c03, 0x2c04, 0x2c05, 0x2c06, 0x2c07, 0x2c08, + 0x2c09, 0x2c0a, 0x2c0b, 0x2c0c, 0x2c0d, 0x2c0e, 0x2c0f, 0x2c10, + 0x2c11, 0x2c12, 0x2c13, 0x2c14, 0x2c15, 0x2c16, 0x2c17, 0x2c18, + 0x2c19, 0x2c1a, 0x2c1b, 0x2c1c, 0x2c1d, 0x2c1e, 0x2c1f, 0x2c20, + 0x2c21, 0x2c22, 0x2c23, 0x2c24, 0x2c25, 0x2c26, 0x2c27, 0x2c28, + 0x2c29, 0x2c2a, 0x2c2b, 0x2c2c, 0x2c2d, 0x2c2e, 0x2c5f, 0x2c60, + 0x2c60, 0x2c62, 0x2c63, 0x2c64, 0x2c65, 0x2c66, 0x2c67, 0x2c67, + 0x2c69, 0x2c69, 0x2c6b, 0x2c6b, 0x2c6d, 0x2c6e, 0x2c6f, 0x2c70, + 0x2c71, 0x2c72, 0x2c73, 0x2c74, 0x2c75, 0x2c75, 0x2c77, 0x2c78, + 0x2c79, 0x2c7a, 0x2c7b, 0x2c7c, 0x2c7d, 0x2c7e, 0x2c7f, 0x2c80, + 0x2c80, 0x2c82, 0x2c82, 0x2c84, 0x2c84, 0x2c86, 0x2c86, 0x2c88, + 0x2c88, 0x2c8a, 0x2c8a, 0x2c8c, 0x2c8c, 0x2c8e, 0x2c8e, 0x2c90, + 0x2c90, 0x2c92, 0x2c92, 0x2c94, 0x2c94, 0x2c96, 0x2c96, 0x2c98, + 0x2c98, 0x2c9a, 0x2c9a, 0x2c9c, 0x2c9c, 0x2c9e, 0x2c9e, 0x2ca0, + 0x2ca0, 0x2ca2, 0x2ca2, 0x2ca4, 0x2ca4, 0x2ca6, 0x2ca6, 0x2ca8, + 0x2ca8, 0x2caa, 0x2caa, 0x2cac, 0x2cac, 0x2cae, 0x2cae, 0x2cb0, + 0x2cb0, 0x2cb2, 0x2cb2, 0x2cb4, 0x2cb4, 0x2cb6, 0x2cb6, 0x2cb8, + 0x2cb8, 0x2cba, 0x2cba, 0x2cbc, 0x2cbc, 0x2cbe, 0x2cbe, 0x2cc0, + 0x2cc0, 0x2cc2, 0x2cc2, 0x2cc4, 0x2cc4, 0x2cc6, 0x2cc6, 0x2cc8, + 0x2cc8, 0x2cca, 0x2cca, 0x2ccc, 0x2ccc, 0x2cce, 0x2cce, 0x2cd0, + 0x2cd0, 0x2cd2, 0x2cd2, 0x2cd4, 0x2cd4, 0x2cd6, 0x2cd6, 0x2cd8, + 0x2cd8, 0x2cda, 0x2cda, 0x2cdc, 0x2cdc, 0x2cde, 0x2cde, 0x2ce0, + 0x2ce0, 0x2ce2, 0x2ce2, 0x2ce4, 0x2ce5, 0x2ce6, 0x2ce7, 0x2ce8, + 0x2ce9, 0x2cea, 0x2ceb, 0x2cec, 0x2ced, 0x2cee, 0x2cef, 0x2cf0, + 0x2cf1, 0x2cf2, 0x2cf3, 0x2cf4, 0x2cf5, 0x2cf6, 0x2cf7, 0x2cf8, + 0x2cf9, 0x2cfa, 0x2cfb, 0x2cfc, 0x2cfd, 0x2cfe, 0x2cff, 0x10a0, + 0x10a1, 0x10a2, 0x10a3, 0x10a4, 0x10a5, 0x10a6, 0x10a7, 0x10a8, + 0x10a9, 0x10aa, 0x10ab, 0x10ac, 0x10ad, 0x10ae, 0x10af, 0x10b0, + 0x10b1, 0x10b2, 0x10b3, 0x10b4, 0x10b5, 0x10b6, 0x10b7, 0x10b8, + 0x10b9, 0x10ba, 0x10bb, 0x10bc, 0x10bd, 0x10be, 0x10bf, 0x10c0, + 0x10c1, 0x10c2, 0x10c3, 0x10c4, 0x10c5, 0xffff, 0xd21b, 0xff21, + 0xff22, 0xff23, 0xff24, 0xff25, 0xff26, 0xff27, 0xff28, 0xff29, + 0xff2a, 0xff2b, 0xff2c, 0xff2d, 0xff2e, 0xff2f, 0xff30, 0xff31, + 0xff32, 0xff33, 0xff34, 0xff35, 0xff36, 0xff37, 0xff38, 0xff39, + 0xff3a, 0xff5b, 0xff5c, 0xff5d, 0xff5e, 0xff5f, 0xff60, 0xff61, + 0xff62, 0xff63, 0xff64, 0xff65, 0xff66, 0xff67, 0xff68, 0xff69, + 0xff6a, 0xff6b, 0xff6c, 0xff6d, 0xff6e, 0xff6f, 0xff70, 0xff71, + 0xff72, 0xff73, 0xff74, 0xff75, 0xff76, 0xff77, 0xff78, 0xff79, + 0xff7a, 0xff7b, 0xff7c, 0xff7d, 0xff7e, 0xff7f, 0xff80, 0xff81, + 0xff82, 0xff83, 0xff84, 0xff85, 0xff86, 0xff87, 0xff88, 0xff89, + 0xff8a, 0xff8b, 0xff8c, 0xff8d, 0xff8e, 0xff8f, 0xff90, 0xff91, + 0xff92, 0xff93, 0xff94, 0xff95, 0xff96, 0xff97, 0xff98, 0xff99, + 0xff9a, 0xff9b, 0xff9c, 0xff9d, 0xff9e, 0xff9f, 0xffa0, 0xffa1, + 0xffa2, 0xffa3, 0xffa4, 0xffa5, 0xffa6, 0xffa7, 0xffa8, 0xffa9, + 0xffaa, 0xffab, 0xffac, 0xffad, 0xffae, 0xffaf, 0xffb0, 0xffb1, + 0xffb2, 0xffb3, 0xffb4, 0xffb5, 0xffb6, 0xffb7, 0xffb8, 0xffb9, + 0xffba, 0xffbb, 0xffbc, 0xffbd, 0xffbe, 0xffbf, 0xffc0, 0xffc1, + 0xffc2, 0xffc3, 0xffc4, 0xffc5, 0xffc6, 0xffc7, 0xffc8, 0xffc9, + 0xffca, 0xffcb, 0xffcc, 0xffcd, 0xffce, 0xffcf, 0xffd0, 0xffd1, + 0xffd2, 0xffd3, 0xffd4, 0xffd5, 0xffd6, 0xffd7, 0xffd8, 0xffd9, + 0xffda, 0xffdb, 0xffdc, 0xffdd, 0xffde, 0xffdf, 0xffe0, 0xffe1, + 0xffe2, 0xffe3, 0xffe4, 0xffe5, 0xffe6, 0xffe7, 0xffe8, 0xffe9, + 0xffea, 0xffeb, 0xffec, 0xffed, 0xffee, 0xffef, 0xfff0, 0xfff1, + 0xfff2, 0xfff3, 0xfff4, 0xfff5, 0xfff6, 0xfff7, 0xfff8, 0xfff9, + 0xfffa, 0xfffb, 0xfffc, 0xfffd, 0xfffe, 0xffff, +}; + +/* + * Allow full-width illegal characters : + * "MS windows 7" supports full-width-invalid-name-characters. + * So we should check half-width-invalid-name-characters(ASCII) only + * for compatibility. + * + * " * / : < > ? \ | + */ +static unsigned short bad_uni_chars[] = { + 0x0022, 0x002A, 0x002F, 0x003A, + 0x003C, 0x003E, 0x003F, 0x005C, 0x007C, + 0 +}; + +static int exfat_convert_char_to_ucs2(struct nls_table *nls, + const unsigned char *ch, int ch_len, unsigned short *ucs2, + int *lossy) +{ + int len; + + *ucs2 = 0x0; + + if (ch[0] < 0x80) { + *ucs2 = ch[0]; + return 1; + } + + len = nls->char2uni(ch, ch_len, ucs2); + if (len < 0) { + /* conversion failed */ + if (lossy != NULL) + *lossy |= NLS_NAME_LOSSY; + *ucs2 = '_'; + return 1; + } + return len; +} + +static int exfat_convert_ucs2_to_char(struct nls_table *nls, + unsigned short ucs2, unsigned char *ch, int *lossy) +{ + int len; + + ch[0] = 0x0; + + if (ucs2 < 0x0080) { + ch[0] = ucs2; + return 1; + } + + len = nls->uni2char(ucs2, ch, MAX_CHARSET_SIZE); + if (len < 0) { + /* conversion failed */ + if (lossy != NULL) + *lossy |= NLS_NAME_LOSSY; + ch[0] = '_'; + return 1; + } + return len; +} + +unsigned short exfat_toupper(struct super_block *sb, unsigned short a) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + + return sbi->vol_utbl[a] ? sbi->vol_utbl[a] : a; +} + +static unsigned short *exfat_wstrchr(unsigned short *str, unsigned short wchar) +{ + while (*str) { + if (*(str++) == wchar) + return str; + } + return NULL; +} + +int exfat_uniname_ncmp(struct super_block *sb, unsigned short *a, + unsigned short *b, unsigned int len) +{ + int i; + + for (i = 0; i < len; i++, a++, b++) + if (exfat_toupper(sb, *a) != exfat_toupper(sb, *b)) + return 1; + return 0; +} + +static int exfat_utf16_to_utf8(struct super_block *sb, + struct exfat_uni_name *p_uniname, unsigned char *p_cstring, + int buflen) +{ + int len; + const unsigned short *uniname = p_uniname->name; + + /* always len >= 0 */ + len = utf16s_to_utf8s(uniname, MAX_NAME_LENGTH, UTF16_HOST_ENDIAN, + p_cstring, buflen); + p_cstring[len] = '\0'; + return len; +} + +static int exfat_utf8_to_utf16(struct super_block *sb, + const unsigned char *p_cstring, const int len, + struct exfat_uni_name *p_uniname, int *p_lossy) +{ + int i, unilen, lossy = NLS_NAME_NO_LOSSY; + unsigned short upname[MAX_NAME_LENGTH + 1]; + unsigned short *uniname = p_uniname->name; + + WARN_ON(!len); + + unilen = utf8s_to_utf16s(p_cstring, len, UTF16_HOST_ENDIAN, + (wchar_t *)uniname, MAX_NAME_LENGTH + 2); + if (unilen < 0) { + exfat_msg(sb, KERN_ERR, + "failed to %s (err : %d) nls len : %d", + __func__, unilen, len); + return unilen; + } + + if (unilen > MAX_NAME_LENGTH) { + exfat_msg(sb, KERN_ERR, + "failed to %s (estr:ENAMETOOLONG) nls len : %d, unilen : %d > %d", + __func__, len, unilen, MAX_NAME_LENGTH); + return -ENAMETOOLONG; + } + + p_uniname->name_len = unilen & 0xFF; + + for (i = 0; i < unilen; i++) { + if (*uniname < 0x0020 || + exfat_wstrchr(bad_uni_chars, *uniname)) + lossy |= NLS_NAME_LOSSY; + + upname[i] = exfat_toupper(sb, *uniname); + uniname++; + } + + *uniname = '\0'; + p_uniname->name_len = unilen; + p_uniname->name_hash = exfat_calc_chksum_2byte(upname, unilen << 1, 0, + CS_DEFAULT); + + if (p_lossy) + *p_lossy = lossy; + return unilen; +} + +#define PLANE_SIZE 0x00010000 +#define SURROGATE_MASK 0xfffff800 +#define SURROGATE_PAIR 0x0000d800 +#define SURROGATE_LOW 0x00000400 +#define SURROGATE_BITS 0x000003ff + +unsigned short exfat_high_surrogate(unicode_t u) +{ + return ((u - PLANE_SIZE) >> 10) + SURROGATE_PAIR; +} + +unsigned short exfat_low_surrogate(unicode_t u) +{ + return ((u - PLANE_SIZE) & SURROGATE_BITS) | SURROGATE_PAIR | + SURROGATE_LOW; +} + +static int __exfat_utf16_to_nls(struct super_block *sb, + struct exfat_uni_name *p_uniname, unsigned char *p_cstring, + int buflen) +{ + int i, j, len, out_len = 0; + unsigned char buf[MAX_CHARSET_SIZE]; + const unsigned short *uniname = p_uniname->name; + struct nls_table *nls = EXFAT_SB(sb)->nls_io; + + i = 0; + while (i < MAX_NAME_LENGTH && out_len < (buflen - 1)) { + if (*uniname == '\0') + break; + if ((*uniname & SURROGATE_MASK) != SURROGATE_PAIR) { + len = exfat_convert_ucs2_to_char(nls, *uniname, buf, + NULL); + } else { + /* Process UTF-16 surrogate pair as one character */ + if (!(*uniname & SURROGATE_LOW) && + i+1 < MAX_NAME_LENGTH && + (*(uniname+1) & SURROGATE_MASK) == SURROGATE_PAIR && + (*(uniname+1) & SURROGATE_LOW)) { + uniname++; + i++; + } + + /* + * UTF-16 surrogate pair encodes code points above + * U+FFFF. Code points above U+FFFF are not supported + * by kernel NLS framework therefore use replacement + * character + */ + len = 1; + buf[0] = '_'; + } + + if (out_len + len >= buflen) + len = buflen - 1 - out_len; + out_len += len; + + if (len > 1) { + for (j = 0; j < len; j++) + *p_cstring++ = buf[j]; + } else { /* len == 1 */ + *p_cstring++ = *buf; + } + + uniname++; + i++; + } + + *p_cstring = '\0'; + return out_len; +} + +static int exfat_nls_to_ucs2(struct super_block *sb, + const unsigned char *p_cstring, const int len, + struct exfat_uni_name *p_uniname, int *p_lossy) +{ + int i = 0, unilen = 0, lossy = NLS_NAME_NO_LOSSY; + unsigned short upname[MAX_NAME_LENGTH + 1]; + unsigned short *uniname = p_uniname->name; + struct nls_table *nls = EXFAT_SB(sb)->nls_io; + + WARN_ON(!len); + + while (unilen < MAX_NAME_LENGTH && i < len) { + i += exfat_convert_char_to_ucs2(nls, p_cstring + i, len - i, + uniname, &lossy); + + if (*uniname < 0x0020 || + exfat_wstrchr(bad_uni_chars, *uniname)) + lossy |= NLS_NAME_LOSSY; + + upname[unilen] = exfat_toupper(sb, *uniname); + uniname++; + unilen++; + } + + if (p_cstring[i] != '\0') + lossy |= NLS_NAME_OVERLEN; + + *uniname = '\0'; + p_uniname->name_len = unilen; + p_uniname->name_hash = exfat_calc_chksum_2byte(upname, unilen << 1, 0, + CS_DEFAULT); + + if (p_lossy) + *p_lossy = lossy; + return unilen; +} + +int exfat_utf16_to_nls(struct super_block *sb, struct exfat_uni_name *uniname, + unsigned char *p_cstring, int buflen) +{ + if (EXFAT_SB(sb)->options.utf8) + return exfat_utf16_to_utf8(sb, uniname, p_cstring, + buflen); + return __exfat_utf16_to_nls(sb, uniname, p_cstring, buflen); +} + +int exfat_nls_to_utf16(struct super_block *sb, const unsigned char *p_cstring, + const int len, struct exfat_uni_name *uniname, int *p_lossy) +{ + if (EXFAT_SB(sb)->options.utf8) + return exfat_utf8_to_utf16(sb, p_cstring, len, + uniname, p_lossy); + return exfat_nls_to_ucs2(sb, p_cstring, len, uniname, p_lossy); +} + +static int exfat_load_upcase_table(struct super_block *sb, + sector_t sector, unsigned long long num_sectors, + unsigned int utbl_checksum) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + unsigned int sect_size = sb->s_blocksize; + unsigned int i, index = 0, checksum = 0; + int ret; + unsigned char skip = false; + unsigned short *upcase_table; + + upcase_table = kcalloc(UTBL_COUNT, sizeof(unsigned short), GFP_KERNEL); + if (!upcase_table) + return -ENOMEM; + + sbi->vol_utbl = upcase_table; + num_sectors += sector; + + while (sector < num_sectors) { + struct buffer_head *bh; + + bh = sb_bread(sb, sector); + if (!bh) { + exfat_msg(sb, KERN_ERR, + "failed to read sector(0x%llx)\n", + (unsigned long long)sector); + ret = -EIO; + goto free_table; + } + sector++; + for (i = 0; i < sect_size && index <= 0xFFFF; i += 2) { + unsigned short uni = get_unaligned_le16(bh->b_data + i); + + checksum = ((checksum & 1) ? 0x80000000 : 0) + + (checksum >> 1) + + *(((unsigned char *)bh->b_data) + i); + checksum = ((checksum & 1) ? 0x80000000 : 0) + + (checksum >> 1) + + *(((unsigned char *)bh->b_data) + (i + 1)); + + if (skip) { + index += uni; + skip = false; + } else if (uni == index) { + index++; + } else if (uni == 0xFFFF) { + skip = true; + } else { /* uni != index , uni != 0xFFFF */ + upcase_table[index] = uni; + index++; + } + } + brelse(bh); + } + + if (index >= 0xFFFF && utbl_checksum == checksum) + return 0; + + exfat_msg(sb, KERN_ERR, + "failed to load upcase table (idx : 0x%08x, chksum : 0x%08x, utbl_chksum : 0x%08x)\n", + index, checksum, utbl_checksum); + ret = -EINVAL; +free_table: + exfat_free_upcase_table(sb); + return ret; +} + +static int exfat_load_default_upcase_table(struct super_block *sb) +{ + int i, ret = -EIO; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + unsigned char skip = false; + unsigned short uni = 0, *upcase_table; + unsigned int index = 0; + + upcase_table = kcalloc(UTBL_COUNT, sizeof(unsigned short), GFP_KERNEL); + if (!upcase_table) + return -ENOMEM; + + sbi->vol_utbl = upcase_table; + + for (i = 0; index <= 0xFFFF && i < EXFAT_NUM_UPCASE; i++) { + uni = uni_def_upcase[i]; + if (skip) { + index += uni; + skip = false; + } else if (uni == index) { + index++; + } else if (uni == 0xFFFF) { + skip = true; + } else { + upcase_table[index] = uni; + index++; + } + } + + if (index >= 0xFFFF) + return 0; + + /* FATAL error: default upcase table has error */ + exfat_free_upcase_table(sb); + return ret; +} + +int exfat_create_upcase_table(struct super_block *sb) +{ + int i, ret; + unsigned int tbl_clu, type; + sector_t sector; + unsigned long long tbl_size, num_sectors; + unsigned char blksize_bits = sb->s_blocksize_bits; + struct exfat_chain clu; + struct exfat_dentry *ep; + struct exfat_sb_info *sbi = EXFAT_SB(sb); + struct buffer_head *bh; + + clu.dir = sbi->root_dir; + clu.flags = ALLOC_FAT_CHAIN; + + while (clu.dir != EXFAT_EOF_CLUSTER) { + for (i = 0; i < sbi->dentries_per_clu; i++) { + ep = exfat_get_dentry(sb, &clu, i, &bh, NULL); + if (!ep) + return -EIO; + + type = exfat_get_entry_type(ep); + if (type == TYPE_UNUSED) { + brelse(bh); + break; + } + + if (type != TYPE_UPCASE) { + brelse(bh); + continue; + } + + tbl_clu = le32_to_cpu(ep->dentry.upcase.start_clu); + tbl_size = le64_to_cpu(ep->dentry.upcase.size); + + sector = exfat_cluster_to_sector(sbi, tbl_clu); + num_sectors = ((tbl_size - 1) >> blksize_bits) + 1; + ret = exfat_load_upcase_table(sb, sector, num_sectors, + le32_to_cpu(ep->dentry.upcase.checksum)); + + brelse(bh); + if (ret && ret != -EIO) + goto load_default; + + /* load successfully */ + return ret; + } + + if (exfat_get_next_cluster(sb, &(clu.dir))) + return -EIO; + } + +load_default: + /* load default upcase table */ + return exfat_load_default_upcase_table(sb); +} + +void exfat_free_upcase_table(struct super_block *sb) +{ + struct exfat_sb_info *sbi = EXFAT_SB(sb); + + kfree(sbi->vol_utbl); + sbi->vol_utbl = NULL; +} -- 2.17.1