| 1 | /* |
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| 2 | * msdos.h |
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| 3 | * |
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| 4 | * The MSDOS filesystem constants/data structures/prototypes |
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| 5 | * |
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| 6 | * Copyright (C) 2001 OKTET Ltd., St.-Petersburg, Russia |
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| 7 | * Author: Eugeny S. Mints <Eugeny.Mints@oktet.ru> |
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| 8 | * |
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| 9 | * The license and distribution terms for this file may be |
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| 10 | * found in the file LICENSE in this distribution or at |
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| 11 | * http://www.rtems.com/license/LICENSE. |
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| 12 | * |
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| 13 | * @(#) $Id$ |
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| 14 | */ |
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| 15 | #ifndef __DOSFS_MSDOS_H__ |
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| 16 | #define __DOSFS_MSDOS_H__ |
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| 17 | |
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| 18 | #ifdef __cplusplus |
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| 19 | extern "C" { |
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| 20 | #endif |
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| 21 | |
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| 22 | #include <rtems.h> |
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| 23 | #include <rtems/libio_.h> |
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| 24 | |
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| 25 | #include "fat.h" |
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| 26 | #include "fat_file.h" |
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| 27 | |
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| 28 | #define MSDOS_NAME_NOT_FOUND_ERR 0xDD000001 |
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| 29 | |
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| 30 | /* |
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| 31 | * This structure identifies the instance of the filesystem on the MSDOS |
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| 32 | * level. |
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| 33 | */ |
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| 34 | typedef struct msdos_fs_info_s |
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| 35 | { |
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| 36 | fat_fs_info_t fat; /* |
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| 37 | * volume |
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| 38 | * description |
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| 39 | */ |
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| 40 | rtems_filesystem_file_handlers_r *directory_handlers; /* |
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| 41 | * a set of routines |
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| 42 | * that handles the |
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| 43 | * nodes of directory |
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| 44 | * type |
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| 45 | */ |
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| 46 | rtems_filesystem_file_handlers_r *file_handlers; /* |
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| 47 | * a set of routines |
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| 48 | * that handles the |
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| 49 | * nodes of file |
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| 50 | * type |
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| 51 | */ |
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| 52 | rtems_id vol_sema; /* |
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| 53 | * semaphore |
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| 54 | * associated with |
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| 55 | * the volume |
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| 56 | */ |
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| 57 | uint8_t *cl_buf; /* |
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| 58 | * just placeholder |
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| 59 | * for anything |
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| 60 | */ |
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| 61 | } msdos_fs_info_t; |
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| 62 | |
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| 63 | /* a set of routines that handle the nodes which are directories */ |
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| 64 | extern rtems_filesystem_file_handlers_r msdos_dir_handlers; |
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| 65 | |
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| 66 | /* a set of routines that handle the nodes which are files */ |
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| 67 | extern rtems_filesystem_file_handlers_r msdos_file_handlers; |
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| 68 | |
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| 69 | /* Volume semaphore timeout value. This value can be changed to a number |
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| 70 | * of ticks to help debugging or if you need such a */ |
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| 71 | #define MSDOS_VOLUME_SEMAPHORE_TIMEOUT RTEMS_NO_TIMEOUT |
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| 72 | |
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| 73 | /* Node types */ |
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| 74 | #define MSDOS_DIRECTORY RTEMS_FILESYSTEM_DIRECTORY |
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| 75 | #define MSDOS_REGULAR_FILE RTEMS_FILESYSTEM_MEMORY_FILE |
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| 76 | #define MSDOS_HARD_LINK RTEMS_FILESYSTEM_HARD_LINK /* pseudo type */ |
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| 77 | |
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| 78 | typedef rtems_filesystem_node_types_t msdos_node_type_t; |
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| 79 | |
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| 80 | /* |
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| 81 | * Macros for fetching fields from 32 bytes long FAT Directory Entry |
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| 82 | * Structure |
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| 83 | */ |
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| 84 | #define MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE 32 /* 32 bytes */ |
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| 85 | |
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| 86 | #define MSDOS_DIR_NAME(x) (char *)((x) + 0) |
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| 87 | #define MSDOS_DIR_ATTR(x) (uint8_t *)((x) + 11) |
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| 88 | #define MSDOS_DIR_NT_RES(x) (uint8_t *)((x) + 12) |
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| 89 | #define MSDOS_DIR_CRT_TIME_TENTH(x) (uint8_t *)((x) + 13) |
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| 90 | #define MSDOS_DIR_CRT_TIME(x) (uint16_t *)((x) + 14) |
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| 91 | #define MSDOS_DIR_CRT_DATE(x) (uint16_t *)((x) + 16) |
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| 92 | #define MSDOS_DIR_LAST_ACCESS_DATE(x) (uint16_t *)((x) + 18) |
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| 93 | #define MSDOS_DIR_FIRST_CLUSTER_HI(x) (uint16_t *)((x) + 20) |
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| 94 | #define MSDOS_DIR_WRITE_TIME(x) (uint16_t *)((x) + 22) |
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| 95 | #define MSDOS_DIR_WRITE_DATE(x) (uint16_t *)((x) + 24) |
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| 96 | #define MSDOS_DIR_FIRST_CLUSTER_LOW(x) (uint16_t *)((x) + 26) |
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| 97 | #define MSDOS_DIR_FILE_SIZE(x) (uint32_t *)((x) + 28) |
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| 98 | |
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| 99 | #define MSDOS_EXTRACT_CLUSTER_NUM(p) \ |
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| 100 | (uint32_t )( (CF_LE_W(*MSDOS_DIR_FIRST_CLUSTER_LOW(p))) | \ |
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| 101 | ((uint32_t )(CF_LE_W((*MSDOS_DIR_FIRST_CLUSTER_HI(p))))<<16) ) |
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| 102 | |
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| 103 | /* |
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| 104 | * Fields offset in 32 bytes long FAT Directory Entry |
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| 105 | * Structure |
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| 106 | */ |
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| 107 | #define MSDOS_FILE_SIZE_OFFSET 28 |
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| 108 | #define MSDOS_FILE_NAME_OFFSET 0 |
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| 109 | #define MSDOS_FIRST_CLUSTER_HI_OFFSET 20 |
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| 110 | #define MSDOS_FIRST_CLUSTER_LOW_OFFSET 26 |
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| 111 | #define MSDOS_FILE_WDATE_OFFSET 24 |
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| 112 | #define MSDOS_FILE_WTIME_OFFSET 22 |
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| 113 | |
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| 114 | /* |
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| 115 | * Possible values of DIR_Attr field of 32 bytes long FAT Directory Entry |
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| 116 | * Structure |
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| 117 | */ |
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| 118 | #define MSDOS_ATTR_READ_ONLY 0x01 |
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| 119 | #define MSDOS_ATTR_HIDDEN 0x02 |
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| 120 | #define MSDOS_ATTR_SYSTEM 0x04 |
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| 121 | #define MSDOS_ATTR_VOLUME_ID 0x08 |
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| 122 | #define MSDOS_ATTR_DIRECTORY 0x10 |
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| 123 | #define MSDOS_ATTR_ARCHIVE 0x20 |
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| 124 | |
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| 125 | #define MSDOS_DT_2SECONDS_MASK 0x1F /* seconds divided by 2 */ |
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| 126 | #define MSDOS_DT_2SECONDS_SHIFT 0 |
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| 127 | #define MSDOS_DT_MINUTES_MASK 0x7E0 /* minutes */ |
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| 128 | #define MSDOS_DT_MINUTES_SHIFT 5 |
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| 129 | #define MSDOS_DT_HOURS_MASK 0xF800 /* hours */ |
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| 130 | #define MSDOS_DT_HOURS_SHIFT 11 |
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| 131 | |
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| 132 | #define MSDOS_DD_DAY_MASK 0x1F /* day of month */ |
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| 133 | #define MSDOS_DD_DAY_SHIFT 0 |
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| 134 | #define MSDOS_DD_MONTH_MASK 0x1E0 /* month */ |
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| 135 | #define MSDOS_DD_MONTH_SHIFT 5 |
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| 136 | #define MSDOS_DD_YEAR_MASK 0xFE00 /* year - 1980 */ |
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| 137 | #define MSDOS_DD_YEAR_SHIFT 9 |
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| 138 | |
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| 139 | |
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| 140 | /* |
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| 141 | * Possible values of DIR_Name[0] field of 32 bytes long FAT Directory Entry |
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| 142 | * Structure |
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| 143 | */ |
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| 144 | #define MSDOS_THIS_DIR_ENTRY_EMPTY 0xE5 |
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| 145 | #define MSDOS_THIS_DIR_ENTRY_AND_REST_EMPTY 0x00 |
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| 146 | |
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| 147 | |
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| 148 | /* |
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| 149 | * Macros for names parsing and formatting |
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| 150 | */ |
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| 151 | #define msdos_is_valid_name_char(_ch) (1) |
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| 152 | #define msdos_is_separator(_ch) rtems_filesystem_is_separator(_ch) |
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| 153 | |
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| 154 | #define MSDOS_SHORT_BASE_LEN 8 /* 8 characters */ |
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| 155 | #define MSDOS_SHORT_EXT_LEN 3 /* 3 characters */ |
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| 156 | #define MSDOS_SHORT_NAME_LEN (MSDOS_SHORT_BASE_LEN+\ |
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| 157 | MSDOS_SHORT_EXT_LEN) /* 11 chars */ |
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| 158 | #define MSDOS_NAME_MAX MSDOS_SHORT_NAME_LEN |
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| 159 | #define MSDOS_NAME_MAX_WITH_DOT (MSDOS_NAME_MAX + 1) |
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| 160 | |
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| 161 | #define MSDOS_DOT_NAME ". " /* ".", padded to MSDOS_NAME chars */ |
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| 162 | #define MSDOS_DOTDOT_NAME ".. " /* "..", padded to MSDOS_NAME chars */ |
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| 163 | |
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| 164 | typedef enum msdos_token_types_e |
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| 165 | { |
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| 166 | MSDOS_NO_MORE_PATH, |
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| 167 | MSDOS_CURRENT_DIR, |
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| 168 | MSDOS_UP_DIR, |
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| 169 | MSDOS_NAME, |
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| 170 | MSDOS_INVALID_TOKEN |
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| 171 | } msdos_token_types_t; |
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| 172 | |
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| 173 | /* Others macros */ |
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| 174 | #define MSDOS_RES_NT_VALUE 0x00 |
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| 175 | #define MSDOS_INIT_DIR_SIZE 0x00 |
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| 176 | |
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| 177 | /* "dot" entry offset in a directory */ |
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| 178 | #define MSDOS_DOT_DIR_ENTRY_OFFSET 0x00 /* first entry in directory */ |
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| 179 | |
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| 180 | /* "dotdot" entry offset in a directory */ |
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| 181 | #define MSDOS_DOTDOT_DIR_ENTRY_OFFSET 0x20 /* second entry in directory */ |
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| 182 | |
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| 183 | /* 'p' should be char* */ |
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| 184 | #define DOT_NODE_P(p) ((char *)(p)) |
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| 185 | #define DOTDOT_NODE_P(p) ((char *)((p) + MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE)) |
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| 186 | |
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| 187 | /* Size limits for files and directories */ |
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| 188 | #define MSDOS_MAX_DIR_LENGHT 0x200000 /* 2,097,152 bytes */ |
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| 189 | #define MSDOS_MAX_FILE_SIZE 0xFFFFFFFF /* 4 Gb */ |
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| 190 | |
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| 191 | /* |
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| 192 | * The number of 32 bytes long FAT Directory Entry |
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| 193 | * Structures per 512 bytes sector |
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| 194 | */ |
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| 195 | #define MSDOS_DPS512_NUM 16 |
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| 196 | |
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| 197 | /* Prototypes */ |
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| 198 | int |
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| 199 | msdos_initialize(rtems_filesystem_mount_table_entry_t *temp_mt_entry); |
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| 200 | |
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| 201 | int |
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| 202 | msdos_shut_down(rtems_filesystem_mount_table_entry_t *temp_mt_entry); |
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| 203 | |
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| 204 | int |
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| 205 | msdos_eval_path(const char *pathname, /* IN */ |
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| 206 | int flags, /* IN */ |
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| 207 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */); |
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| 208 | |
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| 209 | int |
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| 210 | msdos_eval4make(const char *path, /* IN */ |
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| 211 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
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| 212 | const char **name /* OUT */); |
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| 213 | |
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| 214 | int |
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| 215 | msdos_unlink(rtems_filesystem_location_info_t *pathloc /* IN */); |
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| 216 | |
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| 217 | int |
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| 218 | msdos_free_node_info(rtems_filesystem_location_info_t *pathloc /* IN */); |
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| 219 | |
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| 220 | rtems_filesystem_node_types_t |
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| 221 | msdos_node_type(rtems_filesystem_location_info_t *pathloc); |
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| 222 | |
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| 223 | int |
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| 224 | msdos_mknod(const char *path, /* IN */ |
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| 225 | mode_t mode, /* IN */ |
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| 226 | dev_t dev, /* IN */ |
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| 227 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */); |
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| 228 | |
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| 229 | int |
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| 230 | msdos_utime(rtems_filesystem_location_info_t *pathloc, /* IN */ |
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| 231 | time_t actime, /* IN */ |
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| 232 | time_t modtime /* IN */); |
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| 233 | |
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| 234 | int |
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| 235 | msdos_initialize_support( |
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| 236 | rtems_filesystem_mount_table_entry_t *temp_mt_entry, |
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| 237 | rtems_filesystem_operations_table *op_table, |
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| 238 | rtems_filesystem_file_handlers_r *file_handlers, |
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| 239 | rtems_filesystem_file_handlers_r *directory_handlers |
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| 240 | ); |
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| 241 | |
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| 242 | int |
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| 243 | msdos_file_open( |
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| 244 | rtems_libio_t *iop, /* IN */ |
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| 245 | const char *pathname, /* IN */ |
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| 246 | uint32_t flag, /* IN */ |
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| 247 | uint32_t mode /* IN */ |
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| 248 | ); |
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| 249 | |
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| 250 | int |
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| 251 | msdos_file_close(rtems_libio_t *iop /* IN */); |
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| 252 | |
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| 253 | ssize_t |
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| 254 | msdos_file_read( |
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| 255 | rtems_libio_t *iop, /* IN */ |
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| 256 | void *buffer, /* IN */ |
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| 257 | uint32_t count /* IN */ |
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| 258 | ); |
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| 259 | |
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| 260 | ssize_t |
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| 261 | msdos_file_write( |
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| 262 | rtems_libio_t *iop, /* IN */ |
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| 263 | const void *buffer, /* IN */ |
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| 264 | uint32_t count /* IN */ |
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| 265 | ); |
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| 266 | |
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| 267 | int |
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| 268 | msdos_file_lseek( |
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| 269 | rtems_libio_t *iop, /* IN */ |
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| 270 | off_t offset, /* IN */ |
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| 271 | int whence /* IN */ |
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| 272 | ); |
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| 273 | |
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| 274 | int |
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| 275 | msdos_file_stat(rtems_filesystem_location_info_t *loc, /* IN */ |
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| 276 | struct stat *buf /* OUT */); |
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| 277 | |
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| 278 | int |
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| 279 | msdos_file_ftruncate( |
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| 280 | rtems_libio_t *iop, /* IN */ |
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| 281 | off_t length /* IN */ |
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| 282 | ); |
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| 283 | |
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| 284 | int |
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| 285 | msdos_file_sync(rtems_libio_t *iop); |
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| 286 | |
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| 287 | int |
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| 288 | msdos_file_datasync(rtems_libio_t *iop); |
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| 289 | |
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| 290 | int |
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| 291 | msdos_file_ioctl( |
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| 292 | rtems_libio_t *iop, /* IN */ |
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| 293 | uint32_t command, /* IN */ |
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| 294 | void *buffer /* IN */ |
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| 295 | ); |
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| 296 | |
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| 297 | int |
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| 298 | msdos_file_rmnod(rtems_filesystem_location_info_t *pathloc /* IN */); |
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| 299 | |
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| 300 | int |
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| 301 | msdos_file_link(rtems_filesystem_location_info_t *to_loc, |
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| 302 | rtems_filesystem_location_info_t *pa_loc, |
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| 303 | const char *token); |
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| 304 | |
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| 305 | int |
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| 306 | msdos_dir_open( |
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| 307 | rtems_libio_t *iop, /* IN */ |
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| 308 | const char *pathname, /* IN */ |
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| 309 | uint32_t flag, /* IN */ |
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| 310 | uint32_t mode /* IN */ |
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| 311 | ); |
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| 312 | |
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| 313 | int |
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| 314 | msdos_dir_close(rtems_libio_t *iop /* IN */); |
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| 315 | |
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| 316 | ssize_t |
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| 317 | msdos_dir_read( |
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| 318 | rtems_libio_t *iop, /* IN */ |
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| 319 | void *buffer, /* IN */ |
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| 320 | uint32_t count /* IN */ |
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| 321 | ); |
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| 322 | |
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| 323 | int |
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| 324 | msdos_dir_lseek( |
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| 325 | rtems_libio_t *iop, /* IN */ |
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| 326 | off_t offset, /* IN */ |
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| 327 | int whence /* IN */ |
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| 328 | ); |
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| 329 | |
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| 330 | int |
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| 331 | msdos_dir_rmnod(rtems_filesystem_location_info_t *pathloc /* IN */); |
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| 332 | |
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| 333 | int |
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| 334 | msdos_dir_sync(rtems_libio_t *iop); |
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| 335 | |
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| 336 | int |
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| 337 | msdos_dir_stat( |
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| 338 | rtems_filesystem_location_info_t *loc, /* IN */ |
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| 339 | struct stat *buf /* OUT */ |
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| 340 | ); |
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| 341 | |
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| 342 | int |
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| 343 | msdos_creat_node(rtems_filesystem_location_info_t *parent_loc, |
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| 344 | msdos_node_type_t type, |
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| 345 | char *name, |
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| 346 | mode_t mode, |
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| 347 | const fat_file_fd_t *link_fd); |
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| 348 | |
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| 349 | /* Misc prototypes */ |
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| 350 | msdos_token_types_t msdos_get_token(const char *path, |
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| 351 | char *token, |
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| 352 | int *token_len); |
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| 353 | |
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| 354 | int |
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| 355 | msdos_find_name(rtems_filesystem_location_info_t *parent_loc, |
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| 356 | char *name); |
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| 357 | |
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| 358 | int |
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| 359 | msdos_get_name_node(rtems_filesystem_location_info_t *parent_loc, |
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| 360 | char *name, |
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| 361 | fat_auxiliary_t *paux, |
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| 362 | char *name_dir_entry); |
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| 363 | |
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| 364 | int |
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| 365 | msdos_dir_info_remove(rtems_filesystem_location_info_t *pathloc); |
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| 366 | |
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| 367 | int |
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| 368 | msdos_filename_unix2dos(char *un, int unlen, char *dn); |
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| 369 | |
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| 370 | void |
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| 371 | msdos_date_unix2dos(unsigned int tsp, unsigned short *ddp, |
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| 372 | unsigned short *dtp); |
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| 373 | |
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| 374 | unsigned int |
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| 375 | msdos_date_dos2unix(unsigned int dd, unsigned int dt); |
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| 376 | |
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| 377 | int |
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| 378 | msdos_set_first_cluster_num(rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 379 | fat_file_fd_t *fat_fd); |
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| 380 | |
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| 381 | int |
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| 382 | msdos_set_file_size(rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 383 | fat_file_fd_t *fat_fd); |
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| 384 | |
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| 385 | int |
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| 386 | msdos_set_first_char4file_name(rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 387 | uint32_t cl, |
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| 388 | uint32_t ofs, |
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| 389 | unsigned char first_char); |
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| 390 | |
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| 391 | int |
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| 392 | msdos_set_dir_wrt_time_and_date( |
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| 393 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 394 | fat_file_fd_t *fat_fd |
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| 395 | ); |
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| 396 | |
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| 397 | |
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| 398 | int |
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| 399 | msdos_dir_is_empty(rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 400 | fat_file_fd_t *fat_fd, |
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| 401 | rtems_boolean *ret_val); |
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| 402 | |
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| 403 | int |
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| 404 | msdos_find_name_in_fat_file( |
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| 405 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 406 | fat_file_fd_t *fat_fd, |
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| 407 | char *name, |
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| 408 | fat_auxiliary_t *paux, |
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| 409 | char *name_dir_entry); |
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| 410 | |
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| 411 | int |
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| 412 | msdos_find_node_by_cluster_num_in_fat_file( |
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| 413 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 414 | fat_file_fd_t *fat_fd, |
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| 415 | uint32_t cl4find, |
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| 416 | fat_auxiliary_t *paux, |
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| 417 | char *dir_entry |
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| 418 | ); |
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| 419 | |
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| 420 | int |
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| 421 | msdos_get_dotdot_dir_info_cluster_num_and_offset( |
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| 422 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 423 | uint32_t cln, |
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| 424 | fat_auxiliary_t *paux, |
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| 425 | char *dir_entry |
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| 426 | ); |
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| 427 | |
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| 428 | #ifdef __cplusplus |
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| 429 | } |
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| 430 | #endif |
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| 431 | |
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| 432 | #endif /* __DOSFS_MSDOS_H__ */ |
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