www.pudn.com > fat16 and fat32 file system.rar > fs_variable.c
/*C**************************************************************************
* NAME: fs_variable.c
*----------------------------------------------------------------------------
* Copyright (c) 2003 Atmel.
*----------------------------------------------------------------------------
* RELEASE: snd1c-refd-nf-4_0_3
* REVISION: 1.3
*----------------------------------------------------------------------------
* PURPOSE:
* File system variable definition
*
* NOTES:
* Arrangement :
* FAT12/16 only
* FAT32 only
* FAT32 and ISO 9660
* FAT12/16 and ISO 9660 ?
*****************************************************************************/
/*_____ I N C L U D E S ____________________________________________________*/
#include "config.h" /* system configuration */
#include "..\mem\hard.h" /* low level function definition */
#include "file.h" /* file function definition */
#if ((MEM_CHIP_FS == FS_FAT_32) || (MEM_CARD_FS == FS_FAT_32))
#include "fat32.h" /* fat32 file-system definition */
#elif ((MEM_CHIP_FS == FS_FAT_12_16) || (MEM_CARD_FS == FS_FAT_12_16))
#include "fat.h"
#endif
#if ((MEM_CHIP_FS == FS_ISO) || (MEM_CARD_FS == FS_ISO))
#include "iso9660.h"
#endif
/*_____ M A C R O S ________________________________________________________*/
/*_____ D E F I N I T I O N ________________________________________________*/
extern pdata Byte gl_buffer[];
/* shared file system variables */
/* disk management */
data Uint32 fat_ptr_data; /* address of the first byte
/* of data */
xdata Byte fat_buf_sector[512]; /* 512 bytes buffer */
/* directory management */
idata Uint16 fat_dclust_byte_count;/* byte counter in directory sector */
idata Uint32 fat_dir_current_sect; /* sector of selected entry in dir list */
xdata Uint16 fat_dir_list_index; /* index of current entry in dir list */
xdata Uint32 fat_dir_start_sect; /* start sector of dir list */
xdata Uint16 fat_dir_list_last; /* index of last entry in dir list */
idata Uint16 fat_dchain_index; /* the number of the fragment of the dir, in fact */
/* the index of the table in the cluster chain */
idata Uint16 fat_fchain_nb_clust; /* the offset of the cluster from the first cluster */
/* of the file fragment */
/* file management */
data Uint16 fat_fclust_byte_count; /* byte counter in file cluster */
xdata Byte current_ext;
xdata char ext[3]; /* file extension (limited to 3 characters) */
char pdata *lfn_name = &(gl_buffer[32]); /* long filename limited to MAX_FILENAME_LEN chars */
/* Mode repeat A/B variables */
xdata Byte fat_fchain_index_save;
xdata Byte fat_fchain_nb_clust_save;
xdata Uint16 fat_fclust_byte_count_save;
/* Specific variables for fat file system */
#if ((MEM_CHIP_FS == FS_FAT_32) || (MEM_CHIP_FS == FS_FAT_12_16) || (MEM_CARD_FS == FS_FAT_32) || (MEM_CARD_FS == FS_FAT_12_16))
/* disk management */
data Uint32 fat_ptr_fats; /* address of the first byte of FAT */
data Uint32 fat_ptr_rdir;
data Byte fat_cluster_size; /* cluster size (sector count) */
idata Byte fat_cluster_mask; /* mask for end of cluster test */
bdata bit fat_is_fat16; /* TRUE: FAT16 - FALSE: FAT12 */
bdata bit fat_open_mode; /* READ or WRITE */
bdata bit fat_2_is_present; /* TRUE: 2 FATs - FALSE: 1 FAT */
bdata bit flag_end_disk_file;
xdata Uint32 fat_count_of_clusters;/* number of cluster - 2 */
xdata Union32 fat_file_size;
xdata Uint32 fat_fat_size; /* FAT size in sector count */
/* directory management */
xdata fat_st_clust_chain dclusters[MAX_DIR_FRAGMENT_NUMBER];
/* cluster chain for the current directory */
bdata bit dir_is_root; /* TRUE: point the root directory */
idata Byte fat_dchain_nb_clust; /* the offset of the cluster from the first cluster */
/* of the dir fragment */
xdata Byte fat_last_dclust_index;/* index of the last cluster in directory chain */
xdata Uint32 fat_dir_current_offs; /* entry offset from fat_dir_current_sect */
xdata fat_st_cache fat_cache; /* The cache structure, see the .h for more info */
/* file management */
xdata fat_st_clust_chain fclusters[MAX_FILE_FRAGMENT_NUMBER];
/* cluster chain for the current file */
idata Byte fat_last_clust_index;/* index of the last cluster in file chain */
idata Byte fat_fchain_index; /* the number of the fragment of the file, in fact */
/* the index of the table in the cluster chain */
xdata Uint32 fat_current_file_size;
xdata Uint32 fat_rootclus_fat32; /* root cluster address */
bdata bit fat_last_dir_cluster_full;
bdata bit fat_no_entries_free;
xdata Uint16 fat_total_clusters;
xdata Uint32 last_free_cluster;
xdata Uint16 fat_root_entry; /* position in root dir */
idata Uint16 fat_current_end_entry_position;
idata Uint16 fat_current_start_entry_position;
xdata Uint16 fat_nb_deleted_entries;
xdata Uint16 fat_nb_total_entries;
bdata bit fat_is_fat32; /* TRUE: FAT32 - FALSE: FAT12/FAT16 */
#endif
#if (MEM_CHIP_FS == FS_ISO) || (MEM_CARD_FS == FS_ISO)
/* iso9660 variables */
xdata iso_VolumeDescriptor iso_header; /* iso header informations */
xdata iso_cache iso_file_cache; /* cache for the current file */
idata Uint16 iso_f_nb_sector;
idata Uint16 iso_f_max_sector;
bdata bit iso_cd; /* if set to one cd is iso else cd is joliet format */
#endif