| 1 | /*
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| 2 | * Copyright (c) 2011 Oleg Romanenko
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| 3 | * All rights reserved.
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| 4 | *
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| 5 | * Redistribution and use in source and binary forms, with or without
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| 6 | * modification, are permitted provided that the following conditions
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| 7 | * are met:
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| 8 | *
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| 9 | * - Redistributions of source code must retain the above copyright
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| 10 | * notice, this list of conditions and the following disclaimer.
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| 11 | * - Redistributions in binary form must reproduce the above copyright
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| 12 | * notice, this list of conditions and the following disclaimer in the
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| 13 | * documentation and/or other materials provided with the distribution.
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| 14 | * - The name of the author may not be used to endorse or promote products
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| 15 | * derived from this software without specific prior written permission.
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| 16 | *
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| 17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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| 18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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| 19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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| 20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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| 21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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| 22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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| 23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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| 24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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| 25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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| 26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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| 27 | */
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| 28 |
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| 29 | /** @addtogroup fs
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| 30 | * @{
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| 31 | */
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| 32 |
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| 33 | /**
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| 34 | * @file exfat_dentry.c
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| 35 | * @brief Functions that work with exFAT directory entries.
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| 36 | */
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| 37 |
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| 38 | #include "exfat_dentry.h"
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| 39 | #include <ctype.h>
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| 40 | #include <str.h>
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| 41 | #include <errno.h>
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| 42 | #include <byteorder.h>
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| 43 | #include <assert.h>
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| 44 |
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| 45 | exfat_dentry_clsf_t exfat_classify_dentry(const exfat_dentry_t *d)
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| 46 | {
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| 47 | switch (d->type) {
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| 48 | case EXFAT_TYPE_VOLLABEL:
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| 49 | return EXFAT_DENTRY_VOLLABEL;
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| 50 | case EXFAT_TYPE_BITMAP:
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| 51 | return EXFAT_DENTRY_BITMAP;
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| 52 | case EXFAT_TYPE_UCTABLE:
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| 53 | return EXFAT_DENTRY_UCTABLE;
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| 54 | case EXFAT_TYPE_GUID:
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| 55 | return EXFAT_DENTRY_GUID;
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| 56 | case EXFAT_TYPE_FILE:
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| 57 | return EXFAT_DENTRY_FILE;
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| 58 | case EXFAT_TYPE_STREAM:
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| 59 | return EXFAT_DENTRY_STREAM;
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| 60 | case EXFAT_TYPE_NAME:
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| 61 | return EXFAT_DENTRY_NAME;
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| 62 | case EXFAT_TYPE_UNUSED:
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| 63 | return EXFAT_DENTRY_LAST;
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| 64 | default:
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| 65 | if (d->type & EXFAT_TYPE_USED)
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| 66 | return EXFAT_DENTRY_SKIP;
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| 67 | else
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| 68 | return EXFAT_DENTRY_FREE;
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| 69 | }
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| 70 | }
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| 71 |
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| 72 | uint16_t exfat_name_hash(const uint16_t *name, const uint16_t *uctable, size_t chars)
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| 73 | {
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| 74 | uint16_t hash = 0;
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| 75 | uint16_t ch;
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| 76 | while (*name) {
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| 77 | if (*name < chars)
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| 78 | ch = uint16_t_le2host(uctable[*name]);
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| 79 | else
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| 80 | ch = *name;
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| 81 | name++;
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| 82 |
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| 83 | hash = ((hash << 15) | (hash >> 1)) + (ch & 0xff);
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| 84 | hash = ((hash << 15) | (hash >> 1)) + (ch >> 8);
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| 85 | }
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| 86 |
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| 87 | return hash;
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| 88 | }
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| 89 |
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| 90 | void exfat_dentry_get_name(const exfat_name_dentry_t *name, size_t size, uint16_t *dst, size_t *offset)
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| 91 | {
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| 92 | size_t i = 0;
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| 93 | while (i < EXFAT_NAME_PART_LEN && *offset < size) {
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| 94 | dst[*offset] = uint16_t_le2host(name->name[i]);
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| 95 | i++;
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| 96 | (*offset)++;
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| 97 | }
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| 98 | dst[*offset] = '\0';
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| 99 | }
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| 100 |
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| 101 | bool exfat_valid_char(wchar_t ch)
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| 102 | {
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| 103 | switch (ch) {
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| 104 | case 0x01 ... 0x1F:
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| 105 | case '/':
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| 106 | case '\\':
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| 107 | case '?':
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| 108 | case '|':
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| 109 | case '>':
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| 110 | case '<':
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| 111 | case '"':
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| 112 | case '*':
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| 113 | case ':':
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| 114 | return false;
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| 115 | default:
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| 116 | return true;
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| 117 | }
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| 118 | }
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| 119 |
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| 120 | bool exfat_valid_name(const char *name)
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| 121 | {
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| 122 | size_t off = 0;
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| 123 | wchar_t ch;
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| 124 |
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| 125 | while ((ch = str_decode(name, &off, STR_NO_LIMIT)) != 0) {
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| 126 | if (!exfat_valid_char(ch))
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| 127 | return false;
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| 128 | }
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| 129 | return true;
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| 130 | }
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| 131 |
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| 132 | size_t exfat_utf16_length(const uint16_t *wstr)
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| 133 | {
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| 134 | size_t len = 0;
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| 135 |
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| 136 | while (*wstr++ != 0)
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| 137 | len++;
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| 138 |
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| 139 | return len;
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| 140 | }
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| 141 |
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| 142 | /**
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| 143 | * @}
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| 144 | */
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