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flashfs.h

#ifndef _FS_FLASHFS_H_
#define _FS_FLASHFS_H_

#include <avr/pgmspace.h>
#include <sys/types.h>
#include <dev/flash.h>

#define TYPE_DIRECTORY 1

#define TYPE_FILE 2

#define TYPE_NULL 0

#define MAX_FILE_NAME 50

#define NUMBER_OF_FILES 50

/*
 * Number of flash pages where is stored filenames.
 */
#define NUMBER_OF_ROOT_PAGE ((sizeof(FILENODEINFS)*NUMBER_OF_FILES+sizeof(FLASHFS))/PAGE_SIZE + 1)

/*
 * First flkash page for storing root pages.
 */
#define ROOT_PAGE 0

/*
 * Defines magic string for filesystem.
 */
#define MAGIC "edunetFS"

/*
 * Name of root catalog.
 */
#define ROOT_CATALOG "/"

/*
 * Maximum number of flash pages allocated to filesystem.
 */
#define MAX_PAGE_NUMBER 8000

/*
 * Number of pages contains information about free pages for files is stored.
 */
#define NUMBER_OF_FAT_PAGE (MAX_PAGE_NUMBER/(PAGE_SIZE*8) + 1)

/*
 * Number of needed bytes for stor information about free and empty pages in flash for filesystem.
 */
#define NUMBER_OF_PACK_UNIT ((MAX_PAGE_NUMBER/(PAGE_SIZE*8) + 1) * PAGE_SIZE)

/*
 * First flash page where files data will be stored.
 * start(root page) + nr of root p + nr of fat p + 1
 */
#define FIRST_FILE_PAGE \
        (ROOT_PAGE \
        + ((sizeof(FILENODEINFS)*NUMBER_OF_FILES+sizeof(FLASHFS))/PAGE_SIZE + 1) \
        + MAX_PAGE_NUMBER/(PAGE_SIZE*8) + 1 \
        + 1)

/*
 * Defines thet flash page is used to stor data.
 */
#define NOT_CLEAR 1

/*
 * Defines that flash page is clear.
 */
#define CLEAR 0

/*
 * Index of pointer to next page in flash page witch contains file data.
 */
#define NEXT_PAGE PAGE_SIZE - sizeof(u_short)

#define EOF 0

typedef struct _FLASHFS FLASHFS;
typedef struct _FILENODE FILENODE;
typedef struct _FILENODEINFS FILENODEINFS;
typedef struct _FILE FILE;
typedef struct _FATINMEMORY FATINMEMORY;

/*
 * Information about file stored in ram memory.
 */
struct _FILENODE {
    /*
     * Pointer to next fileNode/
     */
    FILENODE*   fileNodeNext;
    /*
     * Name of file.
     */
    u_char      fileName[MAX_FILE_NAME];
    /*
     * Number of file bytes.
     */
    u_long      fileSize;
    /*
     * Number of first page in flash.
     */
    u_short     firstPage;
    /*
     * Identyfier defines on which mode file was open.
     */
    u_char        operationType;
};

/*
 * Information about file stored in filesystem.
 * Information is stored in root pages.
 */
struct _FILENODEINFS {
    /*
     * Name of file.
     */
    u_char      fileName[MAX_FILE_NAME];    
    /*
     * Number of file bytes.
     */
    u_long      fileSize;
    /*
     * Number of first page in flash.
     */
    u_short     firstPage;
};

/*
 * File descriptor used by read and write function.
 * Created when file is open.
 */
struct _FILE {
    /*
     * Pinter to file information.
     */
    FILENODE    *fileNode;
    /*
     * Current position on page.
     */
    u_short     positionOnPage;
    /*
     * Current page number.
     */
    u_short     pageNumber;
};

/*
 * Information about filesystem stored in flash.
 */
struct _FLASHFS {
    /*
     * Mugic string.
     */
        char magic[sizeof(MAGIC)];
    /*
     * Number of used flash pages.
     */
        u_short numberOfPage;
};

/*
 * Fat information stored in ram.
 * Defines which page is used for file data.
 */
struct _FATINMEMORY {
    /*
     * Compresed information about used page.
     * One bit - one flash page.
     */
        u_char packUnit[NUMBER_OF_PACK_UNIT];
};

extern int InitFlashFs(void);

extern FILE* fileOpen(char* name, char type);

extern int fileWrite(FILE *file, void *data, u_int size);

extern int fileClose(FILE *file);

extern int fileRead(FILE *file, void *data, u_int size);

extern u_long fileSize(FILE *file);

extern int fileSeek(FILE *file, u_long pos);

extern int remove(char* name);

extern char* ls(char* dir, char* ret, char* param);

/*
 * Changes current directory.
 * (not implemented)
 *
 * \param dir - directory path.
 *
 * \return 0 on succes -1 on fail.
 */
extern int cd(char* dir);

/*
 * Print current working directory.
 * (not implemented)
 * 
 * \param ret - pointer to buffor where output will be stored.
 *
 * \return pointer to buffor where output will be stored.
 */
extern char* pwd(char* ret);

extern int format(void);

#endif

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