libuuu/fat.h

   1 /*
   2 * Copyright 2018 NXP.
   3 *
   4 * Redistribution and use in source and binary forms, with or without modification,
   5 * are permitted provided that the following conditions are met:
   6 *
   7 * Redistributions of source code must retain the above copyright notice, this
   8 * list of conditions and the following disclaimer.
   9 *
  10 * Redistributions in binary form must reproduce the above copyright notice, this
  11 * list of conditions and the following disclaimer in the documentation and/or
  12 * other materials provided with the distribution.
  13 *
  14 * Neither the name of the NXP Semiconductor nor the names of its
  15 * contributors may be used to endorse or promote products derived from this
  16 * software without specific prior written permission.
  17 *
  18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  19 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  21 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
  22 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  23 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  24 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  25 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  26 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  27 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28 * POSSIBILITY OF SUCH DAMAGE.
  29 *
  30 */
  31
  32 #pragma once
  33
  34 #include "backfile.h"
  35 #include "buffer.h"
  36
  37 #include <map>
  38
  39 #pragma pack(1)
  40 struct Partition
  41 {
  42         uint8_t status;
  43         uint8_t start_head;
  44         uint8_t start_sector;
  45         uint8_t start_cylinder;
  46         uint8_t type;
  47         uint8_t end_head;
  48         uint8_t end_sector;
  49         uint8_t end_cylinder;
  50         uint32_t lba_start;
  51         uint32_t lba_num;
  52 };
  53
  54 struct FatDirEntry
  55 {
  56         uint8_t filename[8];
  57         uint8_t ext[3];
  58         uint8_t attr;
  59         uint8_t user_attr;
  60         uint8_t delele_char;
  61         uint16_t create_time;
  62         uint16_t create_date;
  63         uint16_t userid;
  64         uint16_t access;
  65         uint16_t modify_time;
  66         uint16_t modify_date;
  67         uint16_t start_cluster;
  68         uint32_t file_size;
  69 };
  70
  71 struct FatLFN
  72 {
  73         uint8_t seq;
  74         uint8_t name1[10];
  75         uint8_t attr;
  76         uint8_t type;
  77         uint8_t sum;
  78         uint8_t name2[12];
  79         uint16_t start_cluster;
  80         uint8_t name3[4];
  81 };
  82
  83 #pragma pack()
  84
  85 class Fat : public Backfile
  86 {
  87 public:
  88         void *get_data_buff(shared_ptr<FileBuffer> p, int cluster);
  89         int get_file_buff(string filename, shared_ptr<FileBuffer>p);
  90         int get_next_cluster(shared_ptr<FileBuffer> p, int cluster);
  91         string lfn2string(FatLFN *p);
  92         int Open(string filename);
  93
  94         map<string, FatDirEntry> m_filemap;
  95
  96 private:
  97         uint64_t m_cluster;
  98         uint64_t m_fat_part_start;
  99         uint64_t m_fat_table_offset;
 100         uint64_t m_logical_sector_perfat;
 101         int m_num_of_rootdir;
 102         uint64_t m_root_dir_offset;
 103 };