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1 | /* |
2 | * linux/fs/hfs/string.c |
3 | * |
4 | * Copyright (C) 1995-1997 Paul H. Hargrove |
5 | * (C) 2003 Ardis Technologies <roman@ardistech.com> |
6 | * This file may be distributed under the terms of the GNU General Public License. |
7 | * |
8 | * This file contains the string comparison function for the |
9 | * Macintosh character set. |
10 | * |
11 | * The code in this file is derived from code which is copyright |
12 | * 1986, 1989, 1990 by Abacus Research and Development, Inc. (ARDI) |
13 | * It is used here by the permission of ARDI's president Cliff Matthews. |
14 | */ |
15 | |
16 | #include "hfs_fs.h" |
17 | #include <linux/dcache.h> |
18 | |
19 | /*================ File-local variables ================*/ |
20 | |
21 | /* |
22 | * unsigned char caseorder[] |
23 | * |
24 | * Defines the lexical ordering of characters on the Macintosh |
25 | * |
26 | * Composition of the 'casefold' and 'order' tables from ARDI's code |
27 | * with the entry for 0x20 changed to match that for 0xCA to remove |
28 | * special case for those two characters. |
29 | */ |
30 | static unsigned char caseorder[256] = { |
31 | 0x00,0x01,0x02,0x03,0x04,0x05,0x06,0x07,0x08,0x09,0x0A,0x0B,0x0C,0x0D,0x0E,0x0F, |
32 | 0x10,0x11,0x12,0x13,0x14,0x15,0x16,0x17,0x18,0x19,0x1A,0x1B,0x1C,0x1D,0x1E,0x1F, |
33 | 0x20,0x22,0x23,0x28,0x29,0x2A,0x2B,0x2C,0x2F,0x30,0x31,0x32,0x33,0x34,0x35,0x36, |
34 | 0x37,0x38,0x39,0x3A,0x3B,0x3C,0x3D,0x3E,0x3F,0x40,0x41,0x42,0x43,0x44,0x45,0x46, |
35 | 0x47,0x48,0x57,0x59,0x5D,0x5F,0x66,0x68,0x6A,0x6C,0x72,0x74,0x76,0x78,0x7A,0x7E, |
36 | 0x8C,0x8E,0x90,0x92,0x95,0x97,0x9E,0xA0,0xA2,0xA4,0xA7,0xA9,0xAA,0xAB,0xAC,0xAD, |
37 | 0x4E,0x48,0x57,0x59,0x5D,0x5F,0x66,0x68,0x6A,0x6C,0x72,0x74,0x76,0x78,0x7A,0x7E, |
38 | 0x8C,0x8E,0x90,0x92,0x95,0x97,0x9E,0xA0,0xA2,0xA4,0xA7,0xAF,0xB0,0xB1,0xB2,0xB3, |
39 | 0x4A,0x4C,0x5A,0x60,0x7B,0x7F,0x98,0x4F,0x49,0x51,0x4A,0x4B,0x4C,0x5A,0x60,0x63, |
40 | 0x64,0x65,0x6E,0x6F,0x70,0x71,0x7B,0x84,0x85,0x86,0x7F,0x80,0x9A,0x9B,0x9C,0x98, |
41 | 0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0x94,0xBB,0xBC,0xBD,0xBE,0xBF,0xC0,0x4D,0x81, |
42 | 0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0x55,0x8A,0xCC,0x4D,0x81, |
43 | 0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0x26,0x27,0xD4,0x20,0x49,0x4B,0x80,0x82,0x82, |
44 | 0xD5,0xD6,0x24,0x25,0x2D,0x2E,0xD7,0xD8,0xA6,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, |
45 | 0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF, |
46 | 0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF |
47 | }; |
48 | |
49 | /*================ Global functions ================*/ |
50 | |
51 | /* |
52 | * Hash a string to an integer in a case-independent way |
53 | */ |
54 | int hfs_hash_dentry(struct dentry *dentry, struct qstr *this) |
55 | { |
56 | const unsigned char *name = this->name; |
57 | unsigned int hash, len = this->len; |
58 | |
59 | if (len > HFS_NAMELEN) |
60 | len = HFS_NAMELEN; |
61 | |
62 | hash = init_name_hash(); |
63 | for (; len; len--) |
64 | hash = partial_name_hash(caseorder[*name++], hash); |
65 | this->hash = end_name_hash(hash); |
66 | return 0; |
67 | } |
68 | |
69 | /* |
70 | * Compare two strings in the HFS filename character ordering |
71 | * Returns positive, negative, or zero, not just 0 or (+/-)1 |
72 | * |
73 | * Equivalent to ARDI's call: |
74 | * ROMlib_RelString(s1+1, s2+1, true, false, (s1[0]<<16) | s2[0]) |
75 | */ |
76 | int hfs_strcmp(const unsigned char *s1, unsigned int len1, |
77 | const unsigned char *s2, unsigned int len2) |
78 | { |
79 | int len, tmp; |
80 | |
81 | len = (len1 > len2) ? len2 : len1; |
82 | |
83 | while (len--) { |
84 | tmp = (int)caseorder[*(s1++)] - (int)caseorder[*(s2++)]; |
85 | if (tmp) |
86 | return tmp; |
87 | } |
88 | return len1 - len2; |
89 | } |
90 | |
91 | /* |
92 | * Test for equality of two strings in the HFS filename character ordering. |
93 | * return 1 on failure and 0 on success |
94 | */ |
95 | int hfs_compare_dentry(struct dentry *dentry, struct qstr *s1, struct qstr *s2) |
96 | { |
97 | const unsigned char *n1, *n2; |
98 | int len; |
99 | |
100 | len = s1->len; |
101 | if (len >= HFS_NAMELEN) { |
102 | if (s2->len < HFS_NAMELEN) |
103 | return 1; |
104 | len = HFS_NAMELEN; |
105 | } else if (len != s2->len) |
106 | return 1; |
107 | |
108 | n1 = s1->name; |
109 | n2 = s2->name; |
110 | while (len--) { |
111 | if (caseorder[*n1++] != caseorder[*n2++]) |
112 | return 1; |
113 | } |
114 | return 0; |
115 | } |
116 |
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