| 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 | typedef uint32_t msdos_status_t; |
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| 31 | |
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| 32 | /* |
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| 33 | * This structure identifies the instance of the filesystem on the MSDOS |
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| 34 | * level. |
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| 35 | */ |
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| 36 | typedef struct msdos_fs_info_s |
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| 37 | { |
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| 38 | fat_fs_info_t fat; /* |
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| 39 | * volume |
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| 40 | * description |
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| 41 | */ |
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| 42 | rtems_filesystem_file_handlers_r *directory_handlers; /* |
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| 43 | * a set of routines |
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| 44 | * that handles the |
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| 45 | * nodes of directory |
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| 46 | * type |
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| 47 | */ |
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| 48 | rtems_filesystem_file_handlers_r *file_handlers; /* |
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| 49 | * a set of routines |
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| 50 | * that handles the |
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| 51 | * nodes of file |
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| 52 | * type |
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| 53 | */ |
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| 54 | rtems_id vol_sema; /* |
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| 55 | * semaphore |
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| 56 | * associated with |
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| 57 | * the volume |
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| 58 | */ |
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| 59 | uint8_t *cl_buf; /* |
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| 60 | * just placeholder |
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| 61 | * for anything |
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| 62 | */ |
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| 63 | } msdos_fs_info_t; |
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| 64 | |
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| 65 | /* a set of routines that handle the nodes which are directories */ |
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| 66 | extern rtems_filesystem_file_handlers_r msdos_dir_handlers; |
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| 67 | |
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| 68 | /* a set of routines that handle the nodes which are files */ |
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| 69 | extern rtems_filesystem_file_handlers_r msdos_file_handlers; |
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| 70 | |
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| 71 | /* Volume semaphore timeout value. This value can be changed to a number |
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| 72 | * of ticks to help debugging or if you need such a */ |
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| 73 | #define MSDOS_VOLUME_SEMAPHORE_TIMEOUT RTEMS_NO_TIMEOUT |
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| 74 | |
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| 75 | /* Node types */ |
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| 76 | #define MSDOS_DIRECTORY RTEMS_FILESYSTEM_DIRECTORY |
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| 77 | #define MSDOS_REGULAR_FILE RTEMS_FILESYSTEM_MEMORY_FILE |
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| 78 | #define MSDOS_HARD_LINK RTEMS_FILESYSTEM_HARD_LINK /* pseudo type */ |
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| 79 | |
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| 80 | typedef rtems_filesystem_node_types_t msdos_node_type_t; |
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| 81 | |
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| 82 | /* |
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| 83 | * Macros for fetching fields from 32 bytes long FAT Directory Entry |
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| 84 | * Structure |
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| 85 | */ |
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| 86 | #define MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE 32 /* 32 bytes */ |
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| 87 | |
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| 88 | #define MSDOS_DIR_NAME(x) (char *)((x) + 0) |
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| 89 | #define MSDOS_DIR_ATTR(x) (uint8_t *)((x) + 11) |
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| 90 | #define MSDOS_DIR_NT_RES(x) (uint8_t *)((x) + 12) |
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| 91 | #define MSDOS_DIR_CRT_TIME_TENTH(x) (uint8_t *)((x) + 13) |
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| 92 | #define MSDOS_DIR_CRT_TIME(x) (uint16_t *)((x) + 14) |
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| 93 | #define MSDOS_DIR_CRT_DATE(x) (uint16_t *)((x) + 16) |
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| 94 | #define MSDOS_DIR_LAST_ACCESS_DATE(x) (uint16_t *)((x) + 18) |
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| 95 | #define MSDOS_DIR_FIRST_CLUSTER_HI(x) (uint16_t *)((x) + 20) |
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| 96 | #define MSDOS_DIR_WRITE_TIME(x) (uint16_t *)((x) + 22) |
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| 97 | #define MSDOS_DIR_WRITE_DATE(x) (uint16_t *)((x) + 24) |
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| 98 | #define MSDOS_DIR_FIRST_CLUSTER_LOW(x) (uint16_t *)((x) + 26) |
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| 99 | #define MSDOS_DIR_FILE_SIZE(x) (uint32_t *)((x) + 28) |
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| 100 | |
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| 101 | #define MSDOS_EXTRACT_CLUSTER_NUM(p) \ |
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| 102 | (uint32_t )( (CF_LE_W(*MSDOS_DIR_FIRST_CLUSTER_LOW(p))) | \ |
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| 103 | ((uint32_t )(CF_LE_W((*MSDOS_DIR_FIRST_CLUSTER_HI(p))))<<16) ) |
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| 104 | |
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| 105 | /* |
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| 106 | * Fields offset in 32 bytes long FAT Directory Entry |
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| 107 | * Structure |
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| 108 | */ |
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| 109 | #define MSDOS_FILE_SIZE_OFFSET 28 |
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| 110 | #define MSDOS_FILE_NAME_OFFSET 0 |
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| 111 | #define MSDOS_FIRST_CLUSTER_HI_OFFSET 20 |
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| 112 | #define MSDOS_FIRST_CLUSTER_LOW_OFFSET 26 |
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| 113 | #define MSDOS_FILE_WDATE_OFFSET 24 |
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| 114 | #define MSDOS_FILE_WTIME_OFFSET 22 |
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| 115 | |
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| 116 | /* |
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| 117 | * Possible values of DIR_Attr field of 32 bytes long FAT Directory Entry |
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| 118 | * Structure |
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| 119 | */ |
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| 120 | #define MSDOS_ATTR_READ_ONLY 0x01 |
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| 121 | #define MSDOS_ATTR_HIDDEN 0x02 |
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| 122 | #define MSDOS_ATTR_SYSTEM 0x04 |
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| 123 | #define MSDOS_ATTR_VOLUME_ID 0x08 |
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| 124 | #define MSDOS_ATTR_DIRECTORY 0x10 |
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| 125 | #define MSDOS_ATTR_ARCHIVE 0x20 |
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| 126 | |
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| 127 | #define MSDOS_DT_2SECONDS_MASK 0x1F /* seconds divided by 2 */ |
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| 128 | #define MSDOS_DT_2SECONDS_SHIFT 0 |
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| 129 | #define MSDOS_DT_MINUTES_MASK 0x7E0 /* minutes */ |
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| 130 | #define MSDOS_DT_MINUTES_SHIFT 5 |
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| 131 | #define MSDOS_DT_HOURS_MASK 0xF800 /* hours */ |
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| 132 | #define MSDOS_DT_HOURS_SHIFT 11 |
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| 133 | |
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| 134 | #define MSDOS_DD_DAY_MASK 0x1F /* day of month */ |
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| 135 | #define MSDOS_DD_DAY_SHIFT 0 |
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| 136 | #define MSDOS_DD_MONTH_MASK 0x1E0 /* month */ |
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| 137 | #define MSDOS_DD_MONTH_SHIFT 5 |
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| 138 | #define MSDOS_DD_YEAR_MASK 0xFE00 /* year - 1980 */ |
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| 139 | #define MSDOS_DD_YEAR_SHIFT 9 |
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| 140 | |
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| 141 | |
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| 142 | /* |
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| 143 | * Possible values of DIR_Name[0] field of 32 bytes long FAT Directory Entry |
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| 144 | * Structure |
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| 145 | */ |
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| 146 | #define MSDOS_THIS_DIR_ENTRY_EMPTY 0xE5 |
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| 147 | #define MSDOS_THIS_DIR_ENTRY_AND_REST_EMPTY 0x00 |
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| 148 | |
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| 149 | |
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| 150 | /* |
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| 151 | * Macros for names parsing and formatting |
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| 152 | */ |
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| 153 | #define msdos_is_valid_name_char(_ch) (1) |
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| 154 | #define msdos_is_separator(_ch) rtems_filesystem_is_separator(_ch) |
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| 155 | |
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| 156 | #define MSDOS_SHORT_BASE_LEN 8 /* 8 characters */ |
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| 157 | #define MSDOS_SHORT_EXT_LEN 3 /* 3 characters */ |
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| 158 | #define MSDOS_SHORT_NAME_LEN (MSDOS_SHORT_BASE_LEN+\ |
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| 159 | MSDOS_SHORT_EXT_LEN) /* 11 chars */ |
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| 160 | #define MSDOS_NAME_MAX MSDOS_SHORT_NAME_LEN |
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| 161 | #define MSDOS_NAME_MAX_WITH_DOT (MSDOS_NAME_MAX + 1) |
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| 162 | |
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| 163 | #define MSDOS_DOT_NAME ". " /* ".", padded to MSDOS_NAME chars */ |
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| 164 | #define MSDOS_DOTDOT_NAME ".. " /* "..", padded to MSDOS_NAME chars */ |
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| 165 | |
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| 166 | typedef enum msdos_token_types_e |
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| 167 | { |
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| 168 | MSDOS_NO_MORE_PATH, |
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| 169 | MSDOS_CURRENT_DIR, |
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| 170 | MSDOS_UP_DIR, |
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| 171 | MSDOS_NAME, |
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| 172 | MSDOS_INVALID_TOKEN |
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| 173 | } msdos_token_types_t; |
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| 174 | |
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| 175 | /* Others macros */ |
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| 176 | #define MSDOS_RES_NT_VALUE 0x00 |
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| 177 | #define MSDOS_INIT_DIR_SIZE 0x00 |
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| 178 | |
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| 179 | /* "dot" entry offset in a directory */ |
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| 180 | #define MSDOS_DOT_DIR_ENTRY_OFFSET 0x00 /* first entry in directory */ |
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| 181 | |
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| 182 | /* "dotdot" entry offset in a directory */ |
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| 183 | #define MSDOS_DOTDOT_DIR_ENTRY_OFFSET 0x20 /* second entry in directory */ |
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| 184 | |
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| 185 | /* 'p' should be char* */ |
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| 186 | #define DOT_NODE_P(p) ((char *)(p)) |
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| 187 | #define DOTDOT_NODE_P(p) ((char *)((p) + MSDOS_DIRECTORY_ENTRY_STRUCT_SIZE)) |
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| 188 | |
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| 189 | /* Size limits for files and directories */ |
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| 190 | #define MSDOS_MAX_DIR_LENGHT 0x200000 /* 2,097,152 bytes */ |
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| 191 | #define MSDOS_MAX_FILE_SIZE 0xFFFFFFFF /* 4 Gb */ |
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| 192 | |
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| 193 | /* |
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| 194 | * The number of 32 bytes long FAT Directory Entry |
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| 195 | * Structures per 512 bytes sector |
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| 196 | */ |
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| 197 | #define MSDOS_DPS512_NUM 16 |
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| 198 | |
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| 199 | /* Prototypes */ |
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| 200 | msdos_status_t |
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| 201 | msdos_initialize(rtems_filesystem_mount_table_entry_t *temp_mt_entry); |
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| 202 | |
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| 203 | msdos_status_t |
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| 204 | msdos_shut_down(rtems_filesystem_mount_table_entry_t *temp_mt_entry); |
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| 205 | |
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| 206 | msdos_status_t |
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| 207 | msdos_eval_path(const char *pathname, /* IN */ |
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| 208 | int flags, /* IN */ |
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| 209 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */); |
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| 210 | |
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| 211 | msdos_status_t |
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| 212 | msdos_eval4make(const char *path, /* IN */ |
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| 213 | rtems_filesystem_location_info_t *pathloc, /* IN/OUT */ |
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| 214 | const char **name /* OUT */); |
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| 215 | |
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| 216 | int |
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| 217 | msdos_unlink(rtems_filesystem_location_info_t *pathloc /* IN */); |
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| 218 | |
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| 219 | msdos_status_t |
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| 220 | msdos_free_node_info(rtems_filesystem_location_info_t *pathloc /* IN */); |
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| 221 | |
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| 222 | rtems_filesystem_node_types_t |
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| 223 | msdos_node_type(rtems_filesystem_location_info_t *pathloc); |
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| 224 | |
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| 225 | msdos_status_t |
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| 226 | msdos_mknod(const char *path, /* IN */ |
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| 227 | mode_t mode, /* IN */ |
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| 228 | dev_t dev, /* IN */ |
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| 229 | rtems_filesystem_location_info_t *pathloc /* IN/OUT */); |
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| 230 | |
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| 231 | msdos_status_t |
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| 232 | msdos_utime(rtems_filesystem_location_info_t *pathloc, /* IN */ |
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| 233 | time_t actime, /* IN */ |
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| 234 | time_t modtime /* IN */); |
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| 235 | |
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| 236 | int |
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| 237 | msdos_initialize_support( |
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| 238 | rtems_filesystem_mount_table_entry_t *temp_mt_entry, |
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| 239 | rtems_filesystem_operations_table *op_table, |
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| 240 | rtems_filesystem_file_handlers_r *file_handlers, |
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| 241 | rtems_filesystem_file_handlers_r *directory_handlers |
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| 242 | ); |
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| 243 | |
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| 244 | int |
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| 245 | msdos_file_open( |
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| 246 | rtems_libio_t *iop, /* IN */ |
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| 247 | const char *pathname, /* IN */ |
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| 248 | uint32_t flag, /* IN */ |
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| 249 | uint32_t mode /* IN */ |
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| 250 | ); |
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| 251 | |
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| 252 | int |
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| 253 | msdos_file_close(rtems_libio_t *iop /* IN */); |
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| 254 | |
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| 255 | ssize_t |
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| 256 | msdos_file_read( |
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| 257 | rtems_libio_t *iop, /* IN */ |
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| 258 | void *buffer, /* IN */ |
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| 259 | uint32_t count /* IN */ |
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| 260 | ); |
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| 261 | |
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| 262 | ssize_t |
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| 263 | msdos_file_write( |
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| 264 | rtems_libio_t *iop, /* IN */ |
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| 265 | const void *buffer, /* IN */ |
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| 266 | uint32_t count /* IN */ |
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| 267 | ); |
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| 268 | |
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| 269 | int |
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| 270 | msdos_file_lseek( |
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| 271 | rtems_libio_t *iop, /* IN */ |
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| 272 | off_t offset, /* IN */ |
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| 273 | int whence /* IN */ |
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| 274 | ); |
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| 275 | |
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| 276 | int |
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| 277 | msdos_file_stat(rtems_filesystem_location_info_t *loc, /* IN */ |
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| 278 | struct stat *buf /* OUT */); |
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| 279 | |
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| 280 | int |
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| 281 | msdos_file_ftruncate( |
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| 282 | rtems_libio_t *iop, /* IN */ |
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| 283 | off_t length /* IN */ |
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| 284 | ); |
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| 285 | |
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| 286 | int |
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| 287 | msdos_file_sync(rtems_libio_t *iop); |
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| 288 | |
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| 289 | int |
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| 290 | msdos_file_datasync(rtems_libio_t *iop); |
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| 291 | |
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| 292 | int |
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| 293 | msdos_file_ioctl( |
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| 294 | rtems_libio_t *iop, /* IN */ |
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| 295 | uint32_t command, /* IN */ |
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| 296 | void *buffer /* IN */ |
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| 297 | ); |
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| 298 | |
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| 299 | msdos_status_t |
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| 300 | msdos_file_rmnod(rtems_filesystem_location_info_t *pathloc /* IN */); |
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| 301 | |
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| 302 | msdos_status_t |
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| 303 | msdos_file_link(rtems_filesystem_location_info_t *to_loc, |
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| 304 | rtems_filesystem_location_info_t *pa_loc, |
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| 305 | const char *token); |
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| 306 | |
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| 307 | int |
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| 308 | msdos_dir_open( |
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| 309 | rtems_libio_t *iop, /* IN */ |
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| 310 | const char *pathname, /* IN */ |
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| 311 | uint32_t flag, /* IN */ |
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| 312 | uint32_t mode /* IN */ |
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| 313 | ); |
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| 314 | |
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| 315 | int |
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| 316 | msdos_dir_close(rtems_libio_t *iop /* IN */); |
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| 317 | |
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| 318 | ssize_t |
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| 319 | msdos_dir_read( |
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| 320 | rtems_libio_t *iop, /* IN */ |
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| 321 | void *buffer, /* IN */ |
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| 322 | uint32_t count /* IN */ |
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| 323 | ); |
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| 324 | |
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| 325 | int |
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| 326 | msdos_dir_lseek( |
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| 327 | rtems_libio_t *iop, /* IN */ |
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| 328 | off_t offset, /* IN */ |
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| 329 | int whence /* IN */ |
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| 330 | ); |
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| 331 | |
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| 332 | int |
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| 333 | msdos_dir_rmnod(rtems_filesystem_location_info_t *pathloc /* IN */); |
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| 334 | |
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| 335 | int |
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| 336 | msdos_dir_sync(rtems_libio_t *iop); |
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| 337 | |
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| 338 | int |
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| 339 | msdos_dir_stat( |
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| 340 | rtems_filesystem_location_info_t *loc, /* IN */ |
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| 341 | struct stat *buf /* OUT */ |
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| 342 | ); |
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| 343 | |
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| 344 | int |
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| 345 | msdos_creat_node(rtems_filesystem_location_info_t *parent_loc, |
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| 346 | msdos_node_type_t type, |
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| 347 | char *name, |
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| 348 | mode_t mode, |
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| 349 | const fat_file_fd_t *link_fd); |
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| 350 | |
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| 351 | /* Misc prototypes */ |
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| 352 | msdos_token_types_t msdos_get_token(const char *path, |
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| 353 | char *token, |
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| 354 | int *token_len); |
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| 355 | |
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| 356 | int |
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| 357 | msdos_find_name(rtems_filesystem_location_info_t *parent_loc, |
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| 358 | char *name); |
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| 359 | |
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| 360 | msdos_status_t |
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| 361 | msdos_get_name_node(rtems_filesystem_location_info_t *parent_loc, |
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| 362 | char *name, |
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| 363 | fat_auxiliary_t *paux, |
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| 364 | char *name_dir_entry); |
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| 365 | |
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| 366 | int |
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| 367 | msdos_dir_info_remove(rtems_filesystem_location_info_t *pathloc); |
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| 368 | |
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| 369 | int |
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| 370 | msdos_filename_unix2dos(char *un, int unlen, char *dn); |
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| 371 | |
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| 372 | void |
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| 373 | msdos_date_unix2dos(unsigned int tsp, unsigned short *ddp, |
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| 374 | unsigned short *dtp); |
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| 375 | |
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| 376 | unsigned int |
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| 377 | msdos_date_dos2unix(unsigned int dd, unsigned int dt); |
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| 378 | |
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| 379 | int |
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| 380 | msdos_set_first_cluster_num(rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 381 | fat_file_fd_t *fat_fd); |
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| 382 | |
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| 383 | int |
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| 384 | msdos_set_file_size(rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 385 | fat_file_fd_t *fat_fd); |
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| 386 | |
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| 387 | int |
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| 388 | msdos_set_first_char4file_name(rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 389 | uint32_t cl, |
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| 390 | uint32_t ofs, |
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| 391 | unsigned char first_char); |
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| 392 | |
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| 393 | int |
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| 394 | msdos_set_dir_wrt_time_and_date( |
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| 395 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 396 | fat_file_fd_t *fat_fd |
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| 397 | ); |
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| 398 | |
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| 399 | |
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| 400 | int |
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| 401 | msdos_dir_is_empty(rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 402 | fat_file_fd_t *fat_fd, |
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| 403 | rtems_boolean *ret_val); |
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| 404 | |
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| 405 | msdos_status_t |
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| 406 | msdos_find_name_in_fat_file( |
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| 407 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 408 | fat_file_fd_t *fat_fd, |
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| 409 | char *name, |
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| 410 | fat_auxiliary_t *paux, |
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| 411 | char *name_dir_entry); |
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| 412 | |
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| 413 | msdos_status_t |
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| 414 | msdos_find_node_by_cluster_num_in_fat_file( |
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| 415 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 416 | fat_file_fd_t *fat_fd, |
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| 417 | uint32_t cl4find, |
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| 418 | fat_auxiliary_t *paux, |
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| 419 | char *dir_entry |
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| 420 | ); |
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| 421 | |
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| 422 | int |
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| 423 | msdos_get_dotdot_dir_info_cluster_num_and_offset( |
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| 424 | rtems_filesystem_mount_table_entry_t *mt_entry, |
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| 425 | uint32_t cln, |
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| 426 | fat_auxiliary_t *paux, |
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| 427 | char *dir_entry |
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| 428 | ); |
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| 429 | |
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| 430 | #ifdef __cplusplus |
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| 431 | } |
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| 432 | #endif |
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| 433 | |
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| 434 | #endif /* __DOSFS_MSDOS_H__ */ |
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