src/main/msc/emfat.h

   1 /*
   2  * Derived from
   3  * https://github.com/fetisov/emfat/blob/master/project/emfat.c
   4  * version: 1.0 (4.01.2015)
   5  */
   6
   7 /*
   8  * The MIT License (MIT)
   9  *
  10  * Copyright (c) 2015 by Sergey Fetisov <fsenok@gmail.com>
  11  *
  12  * Permission is hereby granted, free of charge, to any person obtaining a copy
  13  * of this software and associated documentation files (the "Software"), to deal
  14  * in the Software without restriction, including without limitation the rights
  15  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  16  * copies of the Software, and to permit persons to whom the Software is
  17  * furnished to do so, subject to the following conditions:
  18  *
  19  * The above copyright notice and this permission notice shall be included in all
  20  * copies or substantial portions of the Software.
  21  *
  22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  23  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  25  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  26  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  27  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  28  * SOFTWARE.
  29  */
  30
  31 #pragma once
  32
  33 #include <stddef.h>
  34 #include <stdint.h>
  35 #include <string.h>
  36 #include <stdbool.h>
  37
  38 #ifdef __cplusplus
  39 extern "C" {
  40 #endif
  41
  42 struct emfat_entry_s;
  43 typedef void (*emfat_readcb_t)(uint8_t *dest, int size, uint32_t offset, struct emfat_entry_s *entry);
  44 typedef void (*emfat_writecb_t)(const uint8_t *data, int size, uint32_t offset, struct emfat_entry_s *entry);
  45
  46 typedef struct emfat_entry_s {
  47     const char     *name;
  48     bool            dir;
  49     uint8_t         attr;
  50     int             level;
  51     uint32_t        offset;
  52     uint32_t        curr_size;
  53     uint32_t        max_size;
  54     long            user_data;
  55     uint32_t        cma_time[3]; /**< create/mod/access time in unix format */
  56     emfat_readcb_t  readcb;
  57     emfat_writecb_t writecb;
  58     struct
  59     {
  60         uint32_t      first_clust;
  61         uint32_t      last_clust;
  62         uint32_t      last_reserved;
  63         uint32_t      num_subentry;
  64         struct emfat_entry_s *top;
  65         struct emfat_entry_s *sub;
  66         struct emfat_entry_s *next;
  67     } priv;
  68 } emfat_entry_t;
  69
  70 typedef struct emfat_s {
  71     uint64_t    vol_size;
  72     uint32_t    disk_sectors;
  73     const char *vol_label;
  74     struct {
  75         uint32_t       boot_lba;
  76         uint32_t       fsinfo_lba;
  77         uint32_t       fat1_lba;
  78         uint32_t       fat2_lba;
  79         uint32_t       root_lba;
  80         uint32_t       num_clust;
  81         uint32_t       free_clust;
  82         emfat_entry_t *entries;
  83         emfat_entry_t *last_entry;
  84         int            num_entries;
  85     } priv;
  86 } emfat_t;
  87
  88 bool emfat_init(emfat_t *emfat, const char *label, emfat_entry_t *entries);
  89 void emfat_read(emfat_t *emfat, uint8_t *data, uint32_t sector, int num_sectors);
  90 void emfat_write(emfat_t *emfat, const uint8_t *data, uint32_t sector, int num_sectors);
  91
  92 #define EMFAT_ENCODE_CMA_TIME(D,M,Y,h,m,s) \
  93     ((((((Y)-1980) << 9) | ((M) << 5) | (D)) << 16) | \
  94     (((h) << 11) | ((m) << 5) | (s >> 1)))
  95
  96 static inline uint32_t emfat_encode_cma_time(int D, int M, int Y, int h, int m, int s)
  97 {
  98     return EMFAT_ENCODE_CMA_TIME(D,M,Y,h,m,s);
  99 }
 100
 101 uint32_t emfat_cma_time_from_unix(uint32_t unix_time);
 102
 103 #define ATTR_READ 0x01
 104 #define ATTR_HIDDEN 0x02
 105 #define ATTR_SYSTEM 0x04
 106 #define ATTR_VOL_LABEL 0x08
 107 #define ATTR_DIR 0x10
 108 #define ATTR_ARCHIVE 0x20
 109 #define ATTR_LONG_FNAME 0x0F
 110
 111 #ifdef __cplusplus
 112 }
 113 #endif