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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 | /* * collate.c - NTFS kernel collation handling. Part of the Linux-NTFS project. * * Copyright (c) 2004 Anton Altaparmakov * * This program/include file is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as published * by the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program/include file is distributed in the hope that it will be * useful, but WITHOUT ANY WARRANTY; without even the implied warranty * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program (in the main directory of the Linux-NTFS * distribution in the file COPYING); if not, write to the Free Software * Foundation,Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "collate.h" #include "debug.h" #include "ntfs.h" static int ntfs_collate_binary(ntfs_volume *vol, const void *data1, const int data1_len, const void *data2, const int data2_len) { int rc; ntfs_debug("Entering."); rc = memcmp(data1, data2, min(data1_len, data2_len)); if (!rc && (data1_len != data2_len)) { if (data1_len < data2_len) rc = -1; else rc = 1; } ntfs_debug("Done, returning %i", rc); return rc; } static int ntfs_collate_ntofs_ulong(ntfs_volume *vol, const void *data1, const int data1_len, const void *data2, const int data2_len) { int rc; u32 d1, d2; ntfs_debug("Entering."); // FIXME: We don't really want to bug here. BUG_ON(data1_len != data2_len); BUG_ON(data1_len != 4); d1 = le32_to_cpup(data1); d2 = le32_to_cpup(data2); if (d1 < d2) rc = -1; else { if (d1 == d2) rc = 0; else rc = 1; } ntfs_debug("Done, returning %i", rc); return rc; } typedef int (*ntfs_collate_func_t)(ntfs_volume *, const void *, const int, const void *, const int); static ntfs_collate_func_t ntfs_do_collate0x0[3] = { ntfs_collate_binary, NULL/*ntfs_collate_file_name*/, NULL/*ntfs_collate_unicode_string*/, }; static ntfs_collate_func_t ntfs_do_collate0x1[4] = { ntfs_collate_ntofs_ulong, NULL/*ntfs_collate_ntofs_sid*/, NULL/*ntfs_collate_ntofs_security_hash*/, NULL/*ntfs_collate_ntofs_ulongs*/, }; /** * ntfs_collate - collate two data items using a specified collation rule * @vol: ntfs volume to which the data items belong * @cr: collation rule to use when comparing the items * @data1: first data item to collate * @data1_len: length in bytes of @data1 * @data2: second data item to collate * @data2_len: length in bytes of @data2 * * Collate the two data items @data1 and @data2 using the collation rule @cr * and return -1, 0, ir 1 if @data1 is found, respectively, to collate before, * to match, or to collate after @data2. * * For speed we use the collation rule @cr as an index into two tables of * function pointers to call the appropriate collation function. */ int ntfs_collate(ntfs_volume *vol, COLLATION_RULE cr, const void *data1, const int data1_len, const void *data2, const int data2_len) { int i; ntfs_debug("Entering."); /* * FIXME: At the moment we only support COLLATION_BINARY and * COLLATION_NTOFS_ULONG, so we BUG() for everything else for now. */ BUG_ON(cr != COLLATION_BINARY && cr != COLLATION_NTOFS_ULONG); i = le32_to_cpu(cr); BUG_ON(i < 0); if (i <= 0x02) return ntfs_do_collate0x0[i](vol, data1, data1_len, data2, data2_len); BUG_ON(i < 0x10); i -= 0x10; if (likely(i <= 3)) return ntfs_do_collate0x1[i](vol, data1, data1_len, data2, data2_len); BUG(); return 0; } |