441 lines
11 KiB
C
441 lines
11 KiB
C
/*
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* Milkymist SoC (Software)
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* Copyright (C) 2007, 2008, 2009, 2010 Sebastien Bourdeauducq
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, version 3 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#include <ctype.h>
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#include <endian.h>
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#include <console.h>
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#include <blockdev.h>
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#include <fatfs.h>
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//#define DEBUG
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#define BLOCK_SIZE 512
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struct partition_descriptor {
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unsigned char flags;
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unsigned char start_head;
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unsigned short start_cylinder;
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unsigned char type;
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unsigned char end_head;
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unsigned short end_cylinder;
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unsigned int start_sector;
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unsigned int end_sector;
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} __attribute__((packed));
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struct firstsector {
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unsigned char bootsector[446];
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struct partition_descriptor partitions[4];
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unsigned char signature[2];
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} __attribute__((packed));
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struct fat16_firstsector {
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/* Common to FATxx */
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char jmp[3];
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char oem[8];
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unsigned short bytes_per_sector;
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unsigned char sectors_per_cluster;
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unsigned short reserved_sectors;
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unsigned char number_of_fat;
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unsigned short max_root_entries;
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unsigned short total_sectors_short;
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unsigned char media_descriptor;
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unsigned short sectors_per_fat;
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unsigned short sectors_per_track;
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unsigned short head_count;
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unsigned int hidden_sectors;
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unsigned int total_sectors;
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/* FAT16 specific */
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unsigned char drive_nr;
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unsigned char reserved;
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unsigned char ext_boot_signature;
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unsigned int id;
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unsigned char volume_label[11];
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unsigned char fstype[8];
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unsigned char bootcode[448];
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unsigned char signature[2];
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} __attribute__((packed));
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struct directory_entry {
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unsigned char filename[8];
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unsigned char extension[3];
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unsigned char attributes;
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unsigned char reserved;
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unsigned char create_time_ms;
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unsigned short create_time;
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unsigned short create_date;
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unsigned short last_access;
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unsigned short ea_index;
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unsigned short lastm_time;
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unsigned short lastm_date;
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unsigned short first_cluster;
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unsigned int file_size;
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} __attribute__((packed));
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struct directory_entry_lfn {
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unsigned char seq;
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unsigned short name1[5]; /* UTF16 */
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unsigned char attributes;
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unsigned char reserved;
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unsigned char checksum;
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unsigned short name2[6];
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unsigned short first_cluster;
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unsigned short name3[2];
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} __attribute__((packed));
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#define PARTITION_TYPE_FAT16 0x06
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#define PARTITION_TYPE_FAT32 0x0b
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static int fatfs_partition_start_sector; /* Sector# of the beginning of the FAT16 partition */
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static int fatfs_sectors_per_cluster;
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static int fatfs_fat_sector; /* Sector of the first FAT */
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static int fatfs_fat_entries; /* Number of entries in the FAT */
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static int fatfs_max_root_entries;
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static int fatfs_root_table_sector; /* Sector# of the beginning of the root table */
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static int fatfs_fat_cached_sector;
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static unsigned short int fatfs_fat_sector_cache[BLOCK_SIZE/2];
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static int fatfs_dir_cached_sector;
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static struct directory_entry fatfs_dir_sector_cache[BLOCK_SIZE/sizeof(struct directory_entry)];
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static int fatfs_data_start_sector;
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int fatfs_init(int devnr)
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{
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struct firstsector s0;
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struct fat16_firstsector s;
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int i;
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if(!bd_init(devnr)) {
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printf("E: Unable to initialize memory card driver\n");
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return 0;
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}
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if(bd_has_part_table(devnr)) {
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/* Read sector 0, with partition table */
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if(!bd_readblock(0, (void *)&s0)) {
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printf("E: Unable to read block 0\n");
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return 0;
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}
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fatfs_partition_start_sector = -1;
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for(i=0;i<4;i++)
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if((s0.partitions[i].type == PARTITION_TYPE_FAT16)
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||(s0.partitions[i].type == PARTITION_TYPE_FAT32)) {
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#ifdef DEBUG
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printf("I: Using partition #%d: start sector %08x, end sector %08x\n", i,
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le32toh(s0.partitions[i].start_sector), le32toh(s0.partitions[i].end_sector));
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#endif
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fatfs_partition_start_sector = le32toh(s0.partitions[i].start_sector);
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break;
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}
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if(fatfs_partition_start_sector == -1) {
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printf("E: No FAT partition was found\n");
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return 0;
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}
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} else
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fatfs_partition_start_sector = 0;
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/* Read first FAT16 sector */
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if(!bd_readblock(fatfs_partition_start_sector, (void *)&s)) {
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printf("E: Unable to read first FAT sector\n");
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return 0;
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}
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#ifdef DEBUG
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{
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char oem[9];
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char volume_label[12];
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memcpy(oem, s.oem, 8);
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oem[8] = 0;
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memcpy(volume_label, s.volume_label, 11);
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volume_label[11] = 0;
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printf("I: OEM name: %s\n", oem);
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printf("I: Volume label: %s\n", volume_label);
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}
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#endif
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if(le16toh(s.bytes_per_sector) != BLOCK_SIZE) {
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printf("E: Unexpected number of bytes per sector (%d)\n", le16toh(s.bytes_per_sector));
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return 0;
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}
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fatfs_sectors_per_cluster = s.sectors_per_cluster;
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fatfs_fat_entries = (le16toh(s.sectors_per_fat)*BLOCK_SIZE)/2;
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fatfs_fat_sector = fatfs_partition_start_sector + 1;
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fatfs_fat_cached_sector = -1;
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fatfs_max_root_entries = le16toh(s.max_root_entries);
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fatfs_root_table_sector = fatfs_fat_sector + s.number_of_fat*le16toh(s.sectors_per_fat);
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fatfs_dir_cached_sector = -1;
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fatfs_data_start_sector = fatfs_root_table_sector + (fatfs_max_root_entries*sizeof(struct directory_entry))/BLOCK_SIZE;
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if(fatfs_max_root_entries == 0) {
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printf("E: Your memory card uses FAT32, which is not supported.\n");
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printf("E: Please reformat your card using FAT16, e.g. use mkdosfs -F 16\n");
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printf("E: FAT32 support would be an appreciated contribution.\n");
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return 0;
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}
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#ifdef DEBUG
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printf("I: Cluster is %d sectors, FAT has %d entries, FAT 1 is at sector %d,\nI: root table is at sector %d (max %d), data is at sector %d, nb of fat: %d\n",
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fatfs_sectors_per_cluster, fatfs_fat_entries, fatfs_fat_sector,
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fatfs_root_table_sector, fatfs_max_root_entries,
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fatfs_data_start_sector, s.number_of_fat);
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#endif
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return 1;
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}
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static int fatfs_read_fat(int offset)
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{
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int wanted_sector;
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if((offset < 0) || (offset >= fatfs_fat_entries)) {
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printf("E: Incorrect offset %d in fatfs_read_fat\n", offset);
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return -1;
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}
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wanted_sector = fatfs_fat_sector + (offset*2)/BLOCK_SIZE;
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if(wanted_sector != fatfs_fat_cached_sector) {
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if(!bd_readblock(wanted_sector, (void *)&fatfs_fat_sector_cache)) {
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printf("E: Memory card failed (FAT), sector %d\n", wanted_sector);
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return -1;
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}
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fatfs_fat_cached_sector = wanted_sector;
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}
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return le16toh(fatfs_fat_sector_cache[offset % (BLOCK_SIZE/2)]);
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}
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static const struct directory_entry *fatfs_read_root_directory(int offset)
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{
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int wanted_sector;
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if((offset < 0) || (offset >= fatfs_max_root_entries))
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return NULL;
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wanted_sector = fatfs_root_table_sector + (offset*sizeof(struct directory_entry))/BLOCK_SIZE;
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if(wanted_sector != fatfs_dir_cached_sector) {
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if(!bd_readblock(wanted_sector, (void *)&fatfs_dir_sector_cache)) {
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printf("E: Memory card failed (Rootdir), sector %d\n", wanted_sector);
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return NULL;
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}
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fatfs_dir_cached_sector = wanted_sector;
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}
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return &fatfs_dir_sector_cache[offset % (BLOCK_SIZE/sizeof(struct directory_entry))];
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}
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static void lfn_to_ascii(const struct directory_entry_lfn *entry, char *name, int terminate)
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{
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int i;
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unsigned short c;
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for(i=0;i<5;i++) {
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c = le16toh(entry->name1[i]);
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if(c <= 255) {
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*name = c;
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name++;
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if(c == 0) return;
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}
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}
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for(i=0;i<6;i++) {
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c = le16toh(entry->name2[i]);
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if(c <= 255) {
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*name = c;
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name++;
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if(c == 0) return;
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}
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}
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for(i=0;i<2;i++) {
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c = le16toh(entry->name3[i]);
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if(c <= 255) {
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*name = c;
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name++;
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if(c == 0) return;
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}
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}
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if(terminate)
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*name = 0;
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}
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static int fatfs_is_regular(const struct directory_entry *entry)
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{
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return ((entry->attributes & 0x10) == 0)
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&& ((entry->attributes & 0x08) == 0)
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&& (entry->filename[0] != 0xe5);
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}
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int fatfs_list_files(fatfs_dir_callback cb, void *param)
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{
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const struct directory_entry *entry;
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char fmtbuf[8+1+3+1];
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char longname[131];
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int has_longname;
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int i, j, k;
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has_longname = 0;
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longname[sizeof(longname)-1] = 0; /* avoid crashing when reading a corrupt FS */
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for(k=0;k<fatfs_max_root_entries;k++) {
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entry = fatfs_read_root_directory(k);
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#ifdef DEBUG
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printf("I: Read entry with attribute %02x\n", entry->attributes);
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#endif
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if(entry->attributes == 0x0f) {
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const struct directory_entry_lfn *entry_lfn;
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unsigned char frag;
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int terminate;
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entry_lfn = (const struct directory_entry_lfn *)entry;
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frag = entry_lfn->seq & 0x3f;
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terminate = entry_lfn->seq & 0x40;
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if(frag*13 < sizeof(longname)) {
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lfn_to_ascii((const struct directory_entry_lfn *)entry, &longname[(frag-1)*13], terminate);
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if(frag == 1) has_longname = 1;
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}
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continue;
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} else {
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if(!fatfs_is_regular(entry)) {
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has_longname = 0;
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continue;
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}
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}
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if(entry == NULL) return 0;
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if(entry->filename[0] == 0) {
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has_longname = 0;
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break;
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}
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j = 0;
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for(i=0;i<8;i++) {
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if(entry->filename[i] == ' ') break;
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fmtbuf[j++] = entry->filename[i];
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}
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fmtbuf[j++] = '.';
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for(i=0;i<3;i++) {
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if(entry->extension[i] == ' ') break;
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fmtbuf[j++] = entry->extension[i];
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}
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fmtbuf[j++] = 0;
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if(!cb(fmtbuf, has_longname ? longname : fmtbuf, param)) return 0;
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has_longname = 0;
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}
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return 1;
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}
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static const struct directory_entry *fatfs_find_file_by_name(const char *filename)
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{
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char searched_filename[8];
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char searched_extension[3];
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char *dot;
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const char *c;
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int i;
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const struct directory_entry *entry;
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dot = strrchr(filename, '.');
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if(dot == NULL)
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return NULL;
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memset(searched_filename, ' ', 8);
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memset(searched_extension, ' ', 3);
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i = 0;
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for(c=filename;c<dot;c++)
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searched_filename[i++] = toupper(*c);
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i = 0;
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for(c=dot+1;*c!=0;c++)
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searched_extension[i++] = toupper(*c);
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for(i=0;i<fatfs_max_root_entries;i++) {
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entry = fatfs_read_root_directory(i);
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if(entry == NULL) break;
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if(entry->filename[0] == 0) break;
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if(!fatfs_is_regular(entry)) continue;
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if(!memcmp(searched_filename, entry->filename, 8)
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&&!memcmp(searched_extension, entry->extension, 3))
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return entry;
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}
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return NULL;
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}
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static int fatfs_load_cluster(int clustern, char *buffer, int maxsectors)
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{
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int startsector;
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int i;
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int toread;
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clustern = clustern - 2;
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startsector = fatfs_data_start_sector + clustern*fatfs_sectors_per_cluster;
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if(maxsectors < fatfs_sectors_per_cluster)
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toread = maxsectors;
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else
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toread = fatfs_sectors_per_cluster;
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for(i=0;i<toread;i++)
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if(!bd_readblock(startsector+i, (unsigned char *)buffer+i*BLOCK_SIZE)) {
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printf("E: Memory card failed (Cluster), sector %d\n", startsector+i);
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return 0;
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}
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return 1;
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}
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int fatfs_load(const char *filename, char *buffer, int size, int *realsize)
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{
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const struct directory_entry *entry;
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int cluster_size;
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int cluster;
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int n;
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cluster_size = fatfs_sectors_per_cluster*BLOCK_SIZE;
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size /= BLOCK_SIZE;
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entry = fatfs_find_file_by_name(filename);
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if(entry == NULL) {
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printf("E: File not found: %s\n", filename);
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return 0;
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}
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if(realsize != NULL) *realsize = le32toh(entry->file_size);
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n = 0;
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cluster = le16toh(entry->first_cluster);
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while(size > 0) {
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if(!fatfs_load_cluster(cluster, buffer+n*cluster_size, size))
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return 0;
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size -= fatfs_sectors_per_cluster;
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n++;
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cluster = fatfs_read_fat(cluster);
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if(cluster >= 0xFFF8) break;
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if(cluster == -1) return 0;
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}
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//putsnonl("\n");
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return n*cluster_size;
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}
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void fatfs_done(void)
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{
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bd_done();
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}
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