fat.h

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//****************************************************************
// FileName:    fat.h                                       
// Description: fat16/fat12/fat32  define                                       
// Version:     1.0                                               
// Histrory:                                                      
//            1.0   chanjl  2003.11.10    create the module    
//****************************************************************

#ifndef _FAT_H_
#define _FAT_H_

#include "type.h"


//---------------------------------------------------------------------------
//Fat Config

#define    COMPILE_FAT_12         0
#define    COMPILE_FAT_16         1
#define    COMPILE_FAT_32         0
#define    COMPILE_FAT_WRITE      0
//---------------------------------------------------------------------------




#define FAT_PARTITIONNED  TRUE              /* TRUE: format with 1 partition, 
                                               FALSE: without partition */
#define FILE_READ              ((byte)0)
#define FILE_WRITE             ((byte)1)

#define FAT_IS_12              ((byte)0)
#define FAT_IS_16              ((byte)1)
#define FAT_IS_32              ((byte)2)

#define FREE_CLUSTER      ((Uint16)0x0000)  /* free cluster value in FAT */
#define LAST_CLUSTER12    ((Uint16)0x0FFF)  /* last file cluster in FAT 12 */
#define BAD_CLUSTER12     ((Uint16)0x0FF7)  /* bad cluster value in FAT 12 */
#define LAST_CLUSTER16    ((Uint16)0xFFFF)  /* last file cluster in FAT 16 */
#define BAD_CLUSTER16     ((Uint16)0xFFF7)  /* bad cluster value in FAT 16  */
#define LAST_CLUSTER32    ((Uint32)0x0FFFFFFF)

#define MBR_ADDRESS       ((Uint32)0)       /* Master Boot Record address */

#define ATTR_READ_ONLY    ((Byte)0x01)      /* only read file attribute*/
#define ATTR_HIDDEN       ((Byte)0x02)      /* Hidden File Attribute */
#define ATTR_SYSTEM       ((Byte)0x04)      /* System File Attribute */
#define ATTR_VOLUME_ID    ((Byte)0x08)      /* on the volume file Attribute*/
#define ATTR_DIRECTORY    ((Byte)0x10)      /* Directory Attribute */
#define ATTR_ARCHIVE      ((Byte)0x20)      /* Archive Attribute */
#define ATTR_LFN_ENTRY    ((Byte)0x0F)      /* LFN entry attribute */
#define ATTR_ROOT_DIR     ((Byte)0x90)      /* internal use only */

#define PARTITION_ACTIVE  ((Byte)0x80)      /* the active partition state */

#define FILE_NOT_EXIST    ((char)0x00)      /* current file does not exist */
//#define FILE_DATA_AREA    ((char)0xFF)      /* file does not exist in data area*/
#define FILE_DELETED      ((char)0xE5)      /* current file is deleted */
#define LFN_SEQ_MASK      ((Byte)0x3F)      /* LFN sequence number mask */

#define FAT12             ((Byte)0x01)      /* FAT12 type */
#define FAT16_INF32M      ((Byte)0x04)      /* FAT16 type < 32 Mbytes */
#define FAT16_SUP32M      ((Byte)0x06)      /* FAT16 type > 32 Mbytes */
#define FAT32             ((Byte)0x0B)      /* FAT32 type not supported */
#define MAX_CLUSTERS12    ((Uint16)4084)    /* FAT12 if < FAT16 else */
#define MAX_CLUSTERS16    ((Uint16)65524)   /* FAT16 if < FAT32 else */


/* Format Info */
#define DIR_SIZE          ((Byte)32)        /* directory entry size */
#define NB_ROOT_ENTRY     ((Uint16)512)
//#define NB_RESERVED       ((Byte)1)         /* number of reserved sectors */
#define NB_FATS           ((Byte)2)
#define HARD_DISK         ((Byte)0xF8)      /* hard disk device */
#define FAT_DRIVE_NUMBER  ((Byte)0x81)
#define FAT_EXT_SIGN      ((Byte)0x29)
#define BR_SIGNATURE      ((Uint16)0xAA55)  /* boot record signature */
#define MBR_ADDRESS       ((Uint32)0)       /* master boot record address */
#define HEAD_NUMBER       ((word)0x10)

/* maximum number of LFN entries */
#define MAX_LFN_ENTRIES   ((Byte)8)       
/* maximum file name length +  18    */
#define MAX_FILENAME_LEN  130 - 1//((Byte)(103 * 2 + 18 ))      

#define MAX_FILE_FRAGMENT_NUMBER ((Byte)150)/* maximum number of authorized */
                                            /* fragment for a file          */
#define MAX_DIR_FRAGMENT_NUMBER ((Byte)10)  /* maximum number of authorized */
                                            /* fragment for a directory     */
                                            /* a directory                  */

#define MAX_DIR_CLUST_NUMBER  ((Byte)5)    /*maximum number of a directory's cluster number */



/*******************************************************************************
* PURPOSE:
* FAT Directory Entry structure
*******************************************************************************/
typedef struct
{
  Byte     extName[3];
  Byte     attributes;                       /* Attributes bits                */                        
  Union32  start_cluster;                    /* Starting cluster number        */
  Union32  size;                             /* File size in bytes             */
} fat_st_dir_entry;


/*******************************************************************************
* PURPOSE: 
* FAT cache of parent directory and current file or directory 
*******************************************************************************/
typedef struct
{
  fat_st_dir_entry parent;                     /* parent directory */
  fat_st_dir_entry current;                    /* current file/directory info */
} fat_st_cache;
  
/* FAT cluster chain structure (each index is a fragment of the file)*/
typedef struct
{
  Union32 cluster;                           /* starting cluster of fragment */
  Byte    number;                            /* number of subsequent clusters in fragment */
} fat_st_clust_chain;

#define MAX_CL_PER_FRAG   255

#define MAX_SUBDIR_DEPTH  ((Byte)10)
/* fat search file in extern memory  */
typedef struct
{
	Uint16  index;
	Byte    file;
}fat_st_info;



#define SCAN_DIR    ((Byte)0)
#define SCAN_FILE   ((Byte)1)
#define SCAN_XXX    ((Byte)0xFF)

#define DIR_ROOT    ((Uint16)0xffff)
#define DIR_XXX     ((Uint16)0xeeee) 

enum
{
	SEARCH_DIR = 0,
	SEARCH_FILE,
	GOTO_PARENT,
	GOTO_CHILD
};


/* File Type */
#define FILE_XXX    ((INT32U)0)
#define FILE_DIR    ((INT32U)1)
#define FILE_LRC    ((INT32U)2)
#define FILE_MP3    ((INT32U)4)
#define FILE_WAV    ((INT32U)8)
#define FILE_WMA    ((INT32U)16)
#define FILE_MID    ((INT32U)32)
#define FILE_AV6    ((INT32U)64)
#define FILE_BMP    ((INT32U)128)
#define FILE_JPG    ((INT32U)256)
#define FILE_TXT    ((INT32U)512)
#define FILE_AAC    ((INT32U)1024)
#define FILE_OGG    ((INT32U)2048)
#define FILE_IMA    ((INT32U)4096)

#endif  /* _FAT_H_ */