| /* |
| * linux/fs/hfsplus/unicode.c |
| * |
| * Copyright (C) 2001 |
| * Brad Boyer (flar@allandria.com) |
| * (C) 2003 Ardis Technologies <roman@ardistech.com> |
| * |
| * Handler routines for unicode strings |
| */ |
| |
| #include <linux/types.h> |
| #include <linux/nls.h> |
| #include "hfsplus_fs.h" |
| #include "hfsplus_raw.h" |
| |
| /* Fold the case of a unicode char, given the 16 bit value */ |
| /* Returns folded char, or 0 if ignorable */ |
| static inline u16 case_fold(u16 c) |
| { |
| u16 tmp; |
| |
| tmp = case_fold_table[(c>>8)]; |
| if (tmp) |
| tmp = case_fold_table[tmp + (c & 0xFF)]; |
| else |
| tmp = c; |
| return tmp; |
| } |
| |
| /* Compare unicode strings, return values like normal strcmp */ |
| int hfsplus_unistrcmp(const struct hfsplus_unistr *s1, const struct hfsplus_unistr *s2) |
| { |
| u16 len1, len2, c1, c2; |
| const hfsplus_unichr *p1, *p2; |
| |
| len1 = be16_to_cpu(s1->length); |
| len2 = be16_to_cpu(s2->length); |
| p1 = s1->unicode; |
| p2 = s2->unicode; |
| |
| while (1) { |
| c1 = c2 = 0; |
| |
| while (len1 && !c1) { |
| c1 = case_fold(be16_to_cpu(*p1)); |
| p1++; |
| len1--; |
| } |
| while (len2 && !c2) { |
| c2 = case_fold(be16_to_cpu(*p2)); |
| p2++; |
| len2--; |
| } |
| |
| if (c1 != c2) |
| return (c1 < c2) ? -1 : 1; |
| if (!c1 && !c2) |
| return 0; |
| } |
| } |
| |
| int hfsplus_uni2asc(const struct hfsplus_unistr *ustr, char *astr, int *len) |
| { |
| const hfsplus_unichr *ip; |
| u8 *op; |
| u16 ustrlen, cc; |
| int size, tmp; |
| |
| op = astr; |
| ip = ustr->unicode; |
| ustrlen = be16_to_cpu(ustr->length); |
| tmp = *len; |
| while (ustrlen > 0 && tmp > 0) { |
| cc = be16_to_cpu(*ip); |
| switch (cc) { |
| case 0: |
| cc = 0x2400; |
| break; |
| case '/': |
| cc = ':'; |
| break; |
| } |
| if (cc > 0x7f) { |
| size = utf8_wctomb(op, cc, tmp); |
| if (size == -1) { |
| /* ignore */ |
| } else { |
| op += size; |
| tmp -= size; |
| } |
| } else { |
| *op++ = (u8) cc; |
| tmp--; |
| } |
| ip++; |
| ustrlen--; |
| } |
| *len = (char *)op - astr; |
| if (ustrlen) |
| return -ENAMETOOLONG; |
| return 0; |
| } |
| |
| int hfsplus_asc2uni(struct hfsplus_unistr *ustr, const char *astr, int len) |
| { |
| int tmp; |
| wchar_t c; |
| u16 outlen = 0; |
| |
| while (outlen <= HFSPLUS_MAX_STRLEN && len > 0) { |
| if (*astr & 0x80) { |
| tmp = utf8_mbtowc(&c, astr, len); |
| if (tmp < 0) { |
| astr++; |
| len--; |
| continue; |
| } else { |
| astr += tmp; |
| len -= tmp; |
| } |
| } else { |
| c = *astr++; |
| len--; |
| } |
| switch (c) { |
| case 0x2400: |
| c = 0; |
| break; |
| case ':': |
| c = '/'; |
| break; |
| } |
| ustr->unicode[outlen] = cpu_to_be16(c); |
| outlen++; |
| } |
| ustr->length = cpu_to_be16(outlen); |
| if (len > 0) |
| return -ENAMETOOLONG; |
| return 0; |
| } |