2 * linux/fs/hfs/string.c
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.
8 * This file contains the string comparison function for the
9 * Macintosh character set.
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.
17 #include <linux/dcache.h>
19 /*================ File-local variables ================*/
22 * unsigned char caseorder[]
24 * Defines the lexical ordering of characters on the Macintosh
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.
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
49 /*================ Global functions ================*/
52 * Hash a string to an integer in a case-independent way
54 int hfs_hash_dentry(const struct dentry
*dentry
, struct qstr
*this)
56 const unsigned char *name
= this->name
;
57 unsigned int hash
, len
= this->len
;
59 if (len
> HFS_NAMELEN
)
62 hash
= init_name_hash();
64 hash
= partial_name_hash(caseorder
[*name
++], hash
);
65 this->hash
= end_name_hash(hash
);
70 * Compare two strings in the HFS filename character ordering
71 * Returns positive, negative, or zero, not just 0 or (+/-)1
73 * Equivalent to ARDI's call:
74 * ROMlib_RelString(s1+1, s2+1, true, false, (s1[0]<<16) | s2[0])
76 int hfs_strcmp(const unsigned char *s1
, unsigned int len1
,
77 const unsigned char *s2
, unsigned int len2
)
81 len
= (len1
> len2
) ? len2
: len1
;
84 tmp
= (int)caseorder
[*(s1
++)] - (int)caseorder
[*(s2
++)];
92 * Test for equality of two strings in the HFS filename character ordering.
93 * return 1 on failure and 0 on success
95 int hfs_compare_dentry(const struct dentry
*parent
, const struct dentry
*dentry
,
96 unsigned int len
, const char *str
, const struct qstr
*name
)
98 const unsigned char *n1
, *n2
;
100 if (len
>= HFS_NAMELEN
) {
101 if (name
->len
< HFS_NAMELEN
)
104 } else if (len
!= name
->len
)
110 if (caseorder
[*n1
++] != caseorder
[*n2
++])
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