/******************************************************************************
 *
 *                Microchip Memory Disk Drive File System
 *
 ******************************************************************************
 * FileName:        FSIO.h
 * Dependencies:    GenericTypeDefs.h
 *                  FSconfig.h
 *                  FSDefs.h
 *                  stddef.h
 * Processor:       PIC18/PIC24/dsPIC30/dsPIC33/PIC32
 * Compiler:        C18/C30/C32
 * Company:         Microchip Technology, Inc.
 * Version:         1.2.0
 *
 * Software License Agreement
 *
 * The software supplied herewith by Microchip Technology Incorporated
 * (the Company) for its PICmicroฎ Microcontroller is intended and
 * supplied to you, the Companys customer, for use solely and
 * exclusively on Microchip PICmicro Microcontroller products. The
 * software is owned by the Company and/or its supplier, and is
 * protected under applicable copyright laws. All rights are reserved.
 * Any use in violation of the foregoing restrictions may subject the
 * user to criminal sanctions under applicable laws, as well as to
 * civil liability for the breach of the terms and conditions of this
 * license.
 *
 * THIS SOFTWARE IS PROVIDED IN AN AS IS CONDITION. NO WARRANTIES,
 * WHETHER EXPRESS, IMPLIED OR STATUTORY, INCLUDING, BUT NOT LIMITED
 * TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
 * PARTICULAR PURPOSE APPLY TO THIS SOFTWARE. THE COMPANY SHALL NOT,
 * IN ANY CIRCUMSTANCES, BE LIABLE FOR SPECIAL, INCIDENTAL OR
 * CONSEQUENTIAL DAMAGES, FOR ANY REASON WHATSOEVER.
 *
*****************************************************************************/

#ifndef  FS_DOT_H
#define  FS_DOT_H

#include "GenericTypeDefs.h"
#include "FSconfig.h"
#include "MDD File System\FSDefs.h" 
#include "stddef.h"

#ifdef USE_SD_INTERFACE_WITH_SPI
    #include    "MDD File System\SD-SPI.h"
#endif
#ifdef USE_CF_INTERFACE_WITH_PMP
    #include    "MDD File System\CF-PMP.h"
#endif
#ifdef USE_MANUAL_CF_INTERFACE
    #include    "MDD File System\CF- Bit transaction.h"
#endif
#ifdef USE_USB_INTERFACE               
    #include    "USB\usb_host_msd_scsi.h"
#endif


//#ifndef __C30__
    #ifdef USE_MANUAL_CF_INTERFACE
        #ifdef USE_SD_INTERFACE_WITH_SPI
            #error This library only supports one physical layer
        #endif
        #ifdef USE_CF_INTERFACE_WITH_PMP
            #error This library only supports one physical layer
        #endif
        #ifdef USE_USB_INTERFACE
            #error This library only supports one physical layer
        #endif
    #endif
    #ifdef USE_SD_INTERFACE_WITH_SPI
        #ifdef USE_CF_INTERFACE_WITH_PMP
            #error This library only supports one physical layer
        #endif
        #ifdef USE_USB_INTERFACE
            #error This library only supports one physical layer
        #endif
    #endif
    #ifdef USE_CF_INTERFACE_WITH_PMP
        #ifdef USE_USB_INTERFACE
            #error This library only supports one physical layer
        #endif
    #endif
//#endif


/*******************************************************************/
/*                     Strunctures and defines                     */
/*******************************************************************/

#ifndef FALSE
    // Summary: False value
    // Description:  This macro will indicate that a condition is false.
    #define FALSE   0
#endif
#ifndef TRUE
    // Summary: True value
    // Description: This macro will indicate that a condition is true.
    #define TRUE    !FALSE  // True value
#endif




#ifndef SEEK_SET
    // Summary: Macro for the FSfseek SEEK_SET base location.
    // Description: Functions as an input for FSfseek that specifies that the position in the file will be changed 
    //              relative to the beginning of the file.
    #define SEEK_SET 0

#endif
#ifndef SEEK_CUR

    // Summary: Macro for the FSfseek SEEK_CUR base location.
    // Description: Functions as an input for FSfseek that specifies that the position in the file will be changed
    //              relative to the current location of the file
    #define SEEK_CUR 1

#endif
#ifndef SEEK_END

    // Summary: Macro for the FSfseek SEEK_END base location
    // Description: Functions as an input for FSfseek that specifies that the position in the file will be changed
    //              relative to the end of the file.  For this macro, the offset value will be subtracted from
    //              the end location of the file by default.
    #define SEEK_END 2

#endif




// Summary: Macro for the FSfopen APPEND mode
// Description: If this macro is specified as the mode argument in a call of FSfopen, the file being opened will
//              be created if it doesn't exist.  If it does exist, it's file information will be loaded and the
//              current location in the file will be set to the end.  The user will then be able to write to the file.
#define APPEND  "a"

// Summary: Macro for the FSfopen WRITE mode
// Description: If this macro is specified as the mode argument in a call of FSfopen, the file being opened will
//              be created if it doesn't exist.  If it does exist, it will be erased and replaced by an empty file
//              of the same name.  The user will then be able to write to the file.
#define WRITE   "w"

// Summary: Macro for the FSfopen READ mode
// Description: If this macro is specified as the mode argument in a call of FSfopen, the file information for the 
//              specified file will be loaded.  If the file does not exist, the FSfopen function will fail.  The user 
//              will then be able to read from the file.
#define READ    "r"

// Summary: Macro for the FSfopen APPEND+ mode
// Description: If this macro is specified as the mode argument in a call of FSfopen, the file being opened will
//              be created if it doesn't exist.  If it does exist, it's file information will be loaded and the
//              current location in the file will be set to the end.  The user will then be able to write to the file
//              or read from the file.
#define APPENDPLUS "a+"

// Summary: Macro for the FSfopen WRITE+ mode
// Description: If this macro is specified as the mode argument in a call of FSfopen, the file being opened will
//              be created if it doesn't exist.  If it does exist, it will be erased and replaced by an empty file
//              of the same name.  The user will then be able to write to the file or read from the file.
#define WRITEPLUS  "w+"

// Summary: Macro for the FSfopen READ+ mode
// Description: If this macro is specified as the mode argument in a call of FSfopen, the file information for the 
//              specified file will be loaded.  If the file does not exist, the FSfopen function will fail.  The user 
//              will then be able to read from the file or write to the file.
#define READPLUS   "r+"



#ifndef intmax_t
    #ifdef __PIC24F__
        // Summary: A data type indicating the maximum integer size in an architecture
        // Description: The intmax_t data type refers to the maximum-sized data type on any given architecture.  This
        //              data type can be specified as a format specifier size specification for the FSfprintf function.
        #define intmax_t long long
    #elif defined __PIC24H__
        #define intmax_t long long
    #elif defined __dsPIC30F__
        #define intmax_t long long
    #elif defined __dsPIC33F__
        #define intmax_t long long
    #endif
#endif



// Summary:  Indicates flag conditions for a file object
// Description: The FILEFLAGS structure is used to indicate conditions in a file.  It contains three flags: 'write' indicates
//              that the file was opened in a mode that allows writes, 'read' indicates that the file was opened in a mode
//              that allows reads, and 'FileWriteEOF' indicates that additional data that is written to the file will increase
//              the file size.
typedef struct
{
    unsigned    write :1;           // Indicates a file was opened in a mode that allows writes
    unsigned    read :1;            // Indicates a file was opened in a mode that allows reads
    unsigned    FileWriteEOF :1;    // Indicates the current position in a file is at the end of the file
}FILEFLAGS;



// Summary: Indicates how to search for file entries in the FILEfind function
// Description: The values in the SEARCH_TYPE enumeration are used internally by the library to indicate how the FILEfind function
//              how to perform a search.  The 'LOOK_FOR_EMPTY_ENTRY' value indicates that FILEfind should search for an empty file entry.
//              The 'LOOK_FOR_MATCHING_ENTRY' value indicates that FILEfind should search for an entry that matches the FSFILE object
//              that was passed into the FILEfind function.
typedef enum{
    LOOK_FOR_EMPTY_ENTRY = 0,
    LOOK_FOR_MATCHING_ENTRY
} SEARCH_TYPE;



// Summary: Macro indicating the length of a 8.3 file name
// Description: The TOTAL_FILE_SIZE macro indicates the maximum number of characters in an 8.3 file name.  This value includes
//              8 characters for the name, three for the extentsion, and 1 for the radix ('.')
#define TOTAL_FILE_SIZE             8+3+1

// Summary: A mask that indicates the limit of directory entries in a sector
// Description: The MASK_MAX_FILE_ENTRY_LIMIT_BITS is used to indicate to the Cache_File_Entry function that a new sector needs to
//              be loaded.
#define MASK_MAX_FILE_ENTRY_LIMIT_BITS          0x0f

// Summary: Value used for shift operations to calculate the sector offset in a directory
// Description: The VALUE_BASED_ON_ENTRIES_PER_CLUSTER macro is used to calculate sector offsets for directories.  The position of the
//              entry is shifted by 4 bits (divided by 16, since there are 16 entries in a sector) to calculate how many sectors a
//              specified entry is offset from the beginning of the directory.
#define VALUE_BASED_ON_ENTRIES_PER_CLUSTER      4

// Summary: A value that will indicate that a dotdot directory entry points to the root.
// Description: The VALUE_DOTDOT_CLUSTER_VALUE_FOR_ROOT macro is used as an absolute address when writing information to a dotdot entry
//              in a newly created directory.  If a dotdot entry points to the root directory, it's cluster value must be set to 0,
//              regardless of the actual cluster number of the root directory.
#define VALUE_DOTDOT_CLUSTER_VALUE_FOR_ROOT     0

// Summary: MAcro indicating the length of an 8.3 file name in a directory entry
// Description: The FILE_NAME_SIZE macro indicates the number of characters that an 8.3 file name will take up when packed in
//              a directory entry.  This value includes 8 characters for the name and 3 for the extension.  Note that the radix is not
//              stored in the directory entry.
#define FILE_NAME_SIZE                          11



// Summary: Contains file information and is used to indicate which file to access.
// Description: The FSFILE structure is used to hold file information for an open file as it's being modified or accessed.  A pointer to 
//              an open file's FSFILE structure will be passeed to any library function that will modify that file.
typedef struct
{
    DISK    *       dsk;            // Pointer to a DISK structure
    DWORD           cluster;        // The first cluster of the file
    DWORD           ccls;           // The current cluster of the file
    WORD            sec;            // The current sector in the current cluster of the file
    WORD            pos;            // The position in the current sector
    DWORD           seek;           // The absolute position in the file
    DWORD           size;           // The size of the file
    FILEFLAGS       flags;          // A structure containing file flags
    WORD            time;           // The file's last update time
    WORD            date;           // The file's last update date
    char            name[FILE_NAME_SIZE];       // The name of the file
    WORD            entry;          // The position of the file's directory entry in it's directory
    WORD            chk;            // File structure checksum
    WORD            attributes;     // The file attributes
    DWORD           dirclus;        // The base cluster of the file's directory
    DWORD           dirccls;        // The current cluster of the file's directory
} FSFILE;



// Summary: A structure used for searching for files on a device.
// Description: The SearchRec structure is used when searching for file on a device.  It contains parameters that will be loaded with
//              file information when a file is found.  It also contains the parameters that the user searched for, allowing further
//              searches to be perfomed in the same directory for additional files that meet the specified criteria.
typedef struct
{
    char            filename[FILE_NAME_SIZE + 2];   // The name of the file that has been found
    unsigned char   attributes;                     // The attributes of the file that has been found
    unsigned long   filesize;                       // The size of the file that has been found
    unsigned long   timestamp;                      // The last modified time of the file that has been found (create time for directories)

    unsigned int    entry;                          // The directory entry of the last file found that matches the specified attributes. (Internal use only)
    char            searchname[FILE_NAME_SIZE + 2]; // The name specified when the user began the search. (Internal use only)
    unsigned char   searchattr;                     // The attributes specified when the user began the search. (Internal use only)
    unsigned int    cwdclus;                        // The directory that this search was performed in. (Internal use only)
    unsigned char   initialized;                    // Check to determine if the structure was initialized by FindFirst (Internal use only)
} SearchRec;


/***************************************************************************
* Prototypes                                                               *
***************************************************************************/




/*************************************************************************
  Function:
    int FSInit(void)
  Summary:
    Function to initialize the device.
  Conditions:
    The physical device should be connected to the microcontroller.
  Input:
    None
  Return Values:
    TRUE -  Initialization successful
    FALSE - Initialization unsuccessful
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    Initializes the static or dynamic memory slots for holding file
    structures.  Initializes the device with the DISKmount function. Loads 
    MBR and boot sector information.  Initializes the current working
    directory to the root directory for the device if directory support
    is enabled.
  Remarks:
    None
  *************************************************************************/

int FSInit(void);


/*********************************************************************
  Function:
    FSFILE * FSfopen (const char * fileName, const char *mode)
  Summary:
    Open a file
  Conditions:
    For read modes, file exists; FSInit performed
  Input:
    fileName -  The name of the file to open
    mode -
         - WRITE -      Create a new file or replace an existing file
         - READ -       Read data from an existing file
         - APPEND -     Append data to an existing file
         - WRITEPLUS -  Create a new file or replace an existing file (reads also enabled)
         - READPLUS -   Read data from an existing file (writes also enabled)
         - APPENDPLUS - Append data to an existing file (reads also enabled)
  Return Values:
    FSFILE * - The pointer to the file object
    NULL -     The file could not be opened
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    This function will open a file or directory.  First, RAM in the
    dynamic heap or static array will be allocated to a new FSFILE object.
    Then, the specified file name will be formatted to ensure that it's
    in 8.3 format.  Next, the FILEfind function will be used to search
    for the specified file name.  If the name is found, one of three
    things will happen: if the file was opened in read mode, its file
    info will be loaded using the FILEopen function; if it was opened in
    write mode, it will be erased, and a new file will be constructed in
    its place; if it was opened in append mode, its file info will be
    loaded with FILEopen and the current location will be moved to the
    end of the file using the FSfseek function.  If the file was not
    found by FILEfind, it will be created if the mode was specified as
    a write or append mode.  In these cases, a pointer to the heap or
    static FSFILE object array will be returned.  If the file was not
    found and the mode was specified as a read mode, the memory
    allocated to the file will be freed and the NULL pointer value
    will be returned.
  Remarks:
    None.
  *********************************************************************/

FSFILE * FSfopen(const char * fileName, const char *mode);



#ifdef ALLOW_PGMFUNCTIONS

/******************************************************************************
  Function:
    FSFILE * FSfopenpgm(const rom char * fileName, const rom char *mode)
  Summary:
    Open a file named with a ROM string on PIC18
  Conditions:
    For read modes, file exists; FSInit performed
  Input:
    fileName -  The name of the file to be opened (ROM)
    mode -      The mode the file will be opened in (ROM)
  Return Values:
    FSFILE * - A pointer to the file object
    NULL -     File could not be opened
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSfopenpgm function will copy a PIC18 ROM fileName and mode argument
    into RAM arrays, and then pass those arrays to the FSfopen function.
  Remarks:
    This function is for use with PIC18 when passing arguments in ROM.
  ******************************************************************************/

    FSFILE * FSfopenpgm(const rom char * fileName, const rom char *mode);


/**************************************************************************************
  Function:
    int FindFirstpgm (const char * fileName, unsigned int attr, SearchRec * rec)
  Summary:
    Find a file named with a ROM string on PIC18
  Conditions:
    None
  Input:
    fileName -  The name of the file to be found (ROM)
    attr -      The attributes of the file to be found
    rec -       Pointer to a search record to store the file info in
  Return Values:
    0 -  File was found
    -1 - No file matching the given parameters was found
  Side Effects:
    Search criteria from previous FindFirst call on passed SearchRec object will be lost.
    The FSerrno variable will be changed.
  Description:
    The FindFirstpgm function will copy a PIC18 ROM fileName argument
    into a RAM array, and then pass that array to the FindFirst function.
  Remarks:
    Call FindFirstpgm or FindFirst before calling FindNext.
    This function is for use with PIC18 when passing arguments in ROM.
  **************************************************************************************/

    int FindFirstpgm (const rom char * fileName, unsigned int attr, SearchRec * rec);


/**************************************************************************
  Function:
    int FSchdirpgm (const rom char * path)
  Summary:
    Changed the CWD with a path in ROM on PIC18
  Conditions:
    None
  Input:
    path - The path of the directory to change to (ROM)
  Return Values:
    0 -   The current working directory was changed successfully
    EOF - The current working directory could not be changed
  Side Effects:
    The current working directory may be changed. The FSerrno variable will
    be changed.
  Description:
    The FSchdirpgm function passes a PIC18 ROM path pointer to the
    chdirhelper function.
  Remarks:
    This function is for use with PIC18 when passing arguments in ROM
  **************************************************************************/

    int FSchdirpgm (const rom char * path);

    #ifdef ALLOW_WRITES


/*************************************************************
  Function:
    int FSremovepgm (const rom char * fileName)
  Summary:
    Delete a file named with a ROM string on PIC18
  Conditions:
    File not opened; file exists
  Input:
    fileName -  The name of the file to be deleted (ROM)
  Return Values:
    0 -  File was removed successfully
    -1 - File could not be removed
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSremovepgm function will copy a PIC18 ROM fileName argument
    into a RAM array, and then pass that array to the FSremove function.
  Remarks:
    This function is for use with PIC18 when passing arguments in ROM.
  *************************************************************/

        int FSremovepgm (const rom char * fileName);


/**************************************************************************
  Function:
    int FSmkdirpgm (const rom char * path)
  Summary:
    Create a directory with a path in ROM on PIC18
  Conditions:
    None
  Input:
    path - The path of directories to create (ROM)
  Return Values:
    0 -   The specified directory was created successfully
    EOF - The specified directory could not be created
  Side Effects:
    Will create all non-existent directories in the path. The FSerrno 
    variable will be changed.
  Description:
    The FSmkdirpgm function passes a PIC18 ROM path pointer to the
    mkdirhelper function.
  Remarks:
    This function is for use with PIC18 when passing arugments in ROM
  **************************************************************************/

        int FSmkdirpgm (const rom char * path);


/**************************************************************************
  Function:
    int FSrmdirpgm (const rom char * path)
  Summary:
    Delete a directory with a path in ROM on PIC18
  Conditions:
    None.
  Input:
    path -      The path of the directory to remove (ROM)
    rmsubdirs - 
              - TRUE -  All sub-dirs and files in the target dir will be removed
              - FALSE - FSrmdir will not remove non-empty directories
  Return Values:
    0 -   The specified directory was deleted successfully
    EOF - The specified directory could not be deleted
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSrmdirpgm function passes a PIC18 ROM path pointer to the
    rmdirhelper function.
  Remarks:
    This function is for use with PIC18 when passing arguments in ROM.
  **************************************************************************/

        int FSrmdirpgm (const rom char * path, unsigned char rmsubdirs);


/*****************************************************************
  Function:
    int FSrenamepgm(const rom char * fileName, FSFILE * fo)
  Summary:
    Rename a file named with a ROM string on PIC18
  Conditions:
    File opened.
  Input:
    fileName -  The new name of the file (in ROM)
    fo -        The file to rename
  Return Values:
    0 -  File renamed successfully
    -1 - File could not be renamed
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The Fsrenamepgm function will copy the rom fileName specified
    by the user into a RAM array and pass that array into the
    FSrename function.
  Remarks:
    This function is for use with PIC18 when passing arguments in ROM.                       
  *****************************************************************/

        int FSrenamepgm (const rom char * fileName, FSFILE * fo);
    #endif
#endif


/************************************************************
  Function:
    int FSfclose(FSFILE *fo)
  Summary:
    Update file information and free FSFILE objects
  Conditions:
    File opened
  Input:
    fo -  Pointer to the file to close
  Return Values:
    0 -   File closed successfully 
    EOF - Error closing the file
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    This function will update the directory entry for the 
    file pointed to by 'fo' with the information contained
    in 'fo,' including the new file size and attributes.
    Timestamp information will also be loaded based on the
    method selected by the user and written to the entry
    as the last modified time and date.  The file entry will
    then be written to the device.  Finally, the memory
    used for the specified file object will be freed from
    the dynamic heap or the array of FSFILE objects.
  Remarks:
    A function to flush data to the device without closing the
    file can be created by removing the portion of this
    function that frees the memory and the line that clears
    the write flag.
  ************************************************************/

int FSfclose(FSFILE *fo);


/*********************************************************
  Function:
    void FSrewind (FSFILE * fo)
  Summary:
    Set the current position in a file to the beginning
  Conditions:
    File opened.
  Input:
    fo -  Pointer to file structure
  Return Values:
    None
  Side Effects:
    None.
  Description:
    The FSrewind funciton will reset the position of the
    specified file to the beginning of the file.  This
    functionality is faster than using FSfseek to reset
    the position in the file.
  Remarks:
    None.
  *********************************************************/

void FSrewind (FSFILE *fo);


/**************************************************************************
  Function:
    size_t FSfread(void *ptr, size_t size, size_t n, FSFILE *stream)
  Summary:
    Read data from a file
  Conditions:
    File is opened in a read mode
  Input:
    ptr -     Destination buffer for read bytes
    size -    Size of units in bytes
    n -       Number of units to be read
    stream -  File to be read from
  Return:
    size_t - number of units read
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSfread function will read data from the specified file.  First,
    the appropriate sector of the file is loaded.  Then, data is read into
    the specified buffer until the specified number of bytes have been read.
    When a cluster boundary is reached, a new cluster will be loaded.  The
    parameters 'size' and 'n' indicate how much data to read.  'Size'
    refers to the size of one object to read (in bytes), and 'n' will refer 
    to the number of these objects to read.  The value returned will be equal 
    to 'n' unless an error occured or the user tried to read beyond the end
    of the file.
  Remarks:
    None.
  **************************************************************************/

size_t FSfread(void *ptr, size_t size, size_t n, FSFILE *stream);


/**********************************************************************
  Function:
    int FSfseek(FSFILE *stream, long offset, int whence)
  Summary:
    Change the current position in a file
  Conditions:
    File opened
  Input:
    stream -    Pointer to file structure
    offset -    Offset from base location
    whence -    
           - SEEK_SET -  Seek from start of file
           - SEEK_CUR -  Seek from current location
           - SEEK_END -  Seek from end of file (subtract offset)
  Return Values:
    0 -  Operation successful 
    -1 - Operation unsuccesful
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSfseek function will change the current position in the file to
    one specified by the user.  First, an absolute offset is calculated
    using the offset and base location passed in by the user.  Then, the
    position variables are updated, and the sector number that corresponds
    to the new location.  That sector is then loaded.  If the offset
    falls exactly on a cluster boundary, a new cluster will be allocated
    to the file and the position will be set to the first byte of that
    cluster.
  Remarks:
    None                                                               
  **********************************************************************/

int FSfseek(FSFILE *stream, long offset, int whence);


/*******************************************************************
  Function:
    long FSftell (FSFILE * fo)
  Summary:
    Determine the current location in a file
  Conditions:
    File opened
  Input:
    fo -  Pointer to file structure
  Return: Current location in the file
  Side Effects:
    The FSerrno variable will be changed
  Description:
    The FSftell function will return the current position in the
    file pointed to by 'fo' by returning the 'seek' variable in the
    FSFILE object, which is used to keep track of the absolute
    location of the current position in the file.
  Remarks:
    None                                                            
  *******************************************************************/

long FSftell(FSFILE *fo);


/****************************************************
  Function:
    int FSfeof( FSFILE * stream )
  Summary:
    Indicate whether the current file position is at the end
  Conditions:
    File is open in a read mode
  Input:
    stream -  Pointer to the target file
  Return Values:
    Non-Zero - EOF reached 
    0 - Not at end of File
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSfeof function will indicate that the end-of-
    file has been reached for the specified file by
    comparing the absolute location in the file to the
    size of the file.
  Remarks:
    None.
  ****************************************************/

int FSfeof( FSFILE * stream );


#ifdef ALLOW_FORMATS
/*******************************************************************
  Function:
    int FSformat (char mode, long int serialNumber, char * volumeID)
  Summary:
    Formats a device
  Conditions:
    The device must possess a valid master boot record.
  Input:
    mode -          - 0 - Just erase the FAT and root
                    - 1 - Create a new boot sector
    serialNumber -  Serial number to write to the card
    volumeID -      Name of the card
  Return Values:
    0 -    Format was successful
    EOF -  Format was unsuccessful
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSformat function can be used to create a new boot sector
    on a device, based on the information in the master boot record.
    This function will first initialize the I/O pins and the device,
    and then attempts to read the master boot record.  If the MBR
    cannot be loaded successfully, the function will fail.  Next, if
    the 'mode' argument is specified as '0' the existing boot sector
    information will be loaded.  If the 'mode' argument is '1' an
    entirely new boot sector will be constructed using the disk
    values from the master boot record.  Once the boot sector has
    been successfully loaded/created, the locations of the FAT and
    root will be loaded from it, and they will be completely
    erased.  If the user has specified a volumeID parameter, a 
    VOLUME attribute entry will be created in the root directory
    to name the device.
  Remarks:
    FAT12 and FAT16 formatting is supported.                        
  *******************************************************************/

int FSformat (char mode, long int serialNumber, char * volumeID);
#endif


#ifdef ALLOW_WRITES
/***************************************************************************
  Function:
    int FSattrib (FSFILE * file, unsigned char attributes)
  Summary:
    Change the attributes of a file
  Conditions:
    File opened
  Input:
    file -        Pointer to file structure
    attributes -  The attributes to set for the file
               -  Attribute -      Value - Indications 
               -  ATTR_READ_ONLY - 0x01  - The read-only attribute
               -  ATTR_HIDDEN -    0x02  - The hidden attribute 
               -  ATTR_SYSTEM -    0x04  - The system attribute 
               -  ATTR_ARCHIVE -   0x20  - The archive attribute
  Return Values:
    0 -  Attribute change was successful 
    -1 - Attribute change was unsuccessful
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSattrib funciton will set the attributes of the specified file
    to the attributes passed in by the user.  This function will load the
    file entry, replace the attributes with the ones specified, and write
    the attributes back.  If the specified file is a directory, the
    directory attribute will be preserved.
  Remarks:
    None                                                                
  ***************************************************************************/

int FSattrib (FSFILE * file, unsigned char attributes);


/***************************************************************
  Function:
    int FSrename (const rom char * fileName, FSFILE * fo)
  Summary:
    Change the name of a file or directory
  Conditions:
    File opened.
  Input:
    fileName -  The new name of the file
    fo -        The file to rename
  Return Values:
    0 -   File was renamed successfully
    EOF - File was not renamed
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSrename function will rename a file.  First, it will
    search through the current working directory to ensure the
    specified new filename is not already in use.  If it isn't,
    the new filename will be written to the file entry of the
    file pointed to by 'fo.'
  Remarks:
    None                                                        
  ***************************************************************/

int FSrename (const char * fileName, FSFILE * fo);


/*********************************************************************
  Function:
    int FSremove (const char * fileName)
  Summary:
    Delete a file
  Conditions:
    File not opened, file exists
  Input:
    fileName -  Name of the file to erase
  Return Values:
    0 -   File removed 
    EOF - File was not removed
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSremove function will attempt to find the specified file with
    the FILEfind function.  If the file is found, it will be erased
    using the FILEerase function.
  Remarks:
    None                                       
  **********************************************************************/

int FSremove (const char * fileName);


/*********************************************************************************
  Function:
    size_t FSfwrite(const void *ptr, size_t size, size_t n, FSFILE *stream)
  Summary:
    Write data to a file
  Conditions:
    File opened in WRITE, APPEND, WRITE+, APPEND+, READ+ mode
  Input:
    ptr -     Pointer to source buffer
    size -    Size of units in bytes
    n -       Number of units to transfer
    stream -  Pointer to file structure
  Return:
    size_t - number of units written
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSfwrite function will write data to a file.  First, the sector that
    corresponds to the current position in the file will be loaded (if it hasn't
    already been cached in the global data buffer).  Data will then be written to
    the device from the specified buffer until the specified amount has been written.
    If the end of a cluster is reached, the next cluster will be loaded, unless
    the end-of-file flag for the specified file has been set.  If it has, a new
    cluster will be allocated to the file.  Finally, the new position and filezize
    will be stored in the FSFILE object.  The parameters 'size' and 'n' indicate how 
    much data to write.  'Size' refers to the size of one object to write (in bytes), 
    and 'n' will refer to the number of these objects to write.  The value returned 
    will be equal  to 'n' unless an error occured.
  Remarks:
    None.
  *********************************************************************************/

size_t FSfwrite(const void *ptr, size_t size, size_t n, FSFILE *stream);

#endif

#ifdef ALLOW_DIRS


/**************************************************************************
  Function:
    int FSchdir (char * path)
  Summary:
    Change the current working directory
  Conditions:
    None
  Input:
    path - The path of the directory to change to.
  Return Values:
    0 -   The current working directory was changed successfully
    EOF - The current working directory could not be changed
  Side Effects:
    The current working directory may be changed. The FSerrno variable will
    be changed.
  Description:
    The FSchdir function passes a RAM pointer to the path to the
    chdirhelper function.
  Remarks:
    None                                            
  **************************************************************************/

int FSchdir (char * path);


/**************************************************************
  Function:
    char * FSgetcwd (char * path, int numchars)
  Summary:
    Get the current working directory name
  Conditions:
    None
  Input:
    path -      Pointer to the array to return the cwd name in
    numchars -  Number of chars in the path
  Return Values:
    char * - The cwd name string pointer (path or defaultArray)
    NULL -   The current working directory name could not be loaded.
  Side Effects:
    The FSerrno variable will be changed
  Description:
    The FSgetcwd function will get the name of the current
    working directory and return it to the user.  The name
    will be copied into the buffer pointed to by 'path,'
    starting at the root directory and copying as many chars
    as possible before the end of the buffer.  The buffer
    size is indicated by the 'numchars' argument.  The first
    thing this function will do is load the name of the current
    working directory, if it isn't already present.  This could
    occur if the user switched to the dotdot entry of a
    subdirectory immediately before calling this function.  The
    function will then copy the current working directory name 
    into the buffer backwards, and insert a backslash character.  
    Next, the function will continuously switch to the previous 
    directories and copy their names backwards into the buffer
    until it reaches the root.  If the buffer overflows, it
    will be treated as a circular buffer, and data will be
    copied over existing characters, starting at the beginning.
    Once the root directory is reached, the text in the buffer
    will be swapped, so that the buffer contains as much of the
    current working directory name as possible, starting at the 
    root.
  Remarks:
    None                                                       
  **************************************************************/

char * FSgetcwd (char * path, int numbchars);


#ifdef ALLOW_WRITES

/**************************************************************************
  Function:
    int FSmkdir (char * path)
  Summary:
    Create a directory
  Conditions:
    None
  Input:
    path - The path of directories to create.
  Return Values:
    0 -   The specified directory was created successfully
    EOF - The specified directory could not be created
  Side Effects:
    Will create all non-existent directories in the path. The FSerrno 
    variable will be changed.
  Description:
    The FSmkdir function passes a RAM pointer to the path to the
    mkdirhelper function.
  Remarks:
    None                                            
  **************************************************************************/

int FSmkdir (char * path);


/**************************************************************************
  Function:
    int FSrmdir (char * path)
  Summary:
    Delete a directory
  Conditions:
    None
  Input:
    path -      The path of the directory to remove
    rmsubdirs - 
              - TRUE -  All sub-dirs and files in the target dir will be removed
              - FALSE - FSrmdir will not remove non-empty directories
  Return Values:
    0 -   The specified directory was deleted successfully
    EOF - The specified directory could not be deleted
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FSrmdir function passes a RAM pointer to the path to the
    rmdirhelper function.
  Remarks:
    None.
  **************************************************************************/

int FSrmdir (char * path, unsigned char rmsubdirs);
#endif

#endif

#ifdef USERDEFINEDCLOCK


/***********************************************************************************************************
  Function:
    int SetClockVars (unsigned int year, unsigned char month, unsigned char day, unsigned char hour, unsigned char minute, unsigned char second)
  Summary:
    Manually set timestamp variables
  Conditions:
    USERDEFINEDCLOCK macro defined in FSconfig.h.
  Input:
    year -     The year (1980\-2107)
    month -   The month (1\-12)
    day -     The day of the month (1\-31)
    hour -    The hour (0\-23)
    minute -  The minute (0\-59)
    second -  The second (0\-59)
  Return Values:
    None
  Side Effects:
    Modifies global timing variables
  Description:
    Lets the user manually set the timing variables.  The values passed in will be converted to the format
    used by the FAT timestamps.
  Remarks:
    Call this before creating a file or directory (set create time) and
    before closing a file (set last access time, last modified time)                                        
  ***********************************************************************************************************/

int SetClockVars (unsigned int year, unsigned char month, unsigned char day, unsigned char hour, unsigned char minute, unsigned char second);
#endif


#ifdef ALLOW_FILESEARCH

/***********************************************************************************
  Function:
    int FindFirst (const char * fileName, unsigned int attr, SearchRec * rec)
  Summary:
    Initial search function
  Conditions:
    None
  Input:
    fileName - The name to search for
             - Parital string search characters
             - * - Indicates the rest of the filename or extension can vary (e.g. FILE.*)
             - ? - Indicates that one character in a filename can vary (e.g. F?LE.T?T)
    attr -            The attributes that a found file may have
         - ATTR_READ_ONLY -  File may be read only
         - ATTR_HIDDEN -     File may be a hidden file
         - ATTR_SYSTEM -     File may be a system file
         - ATTR_VOLUME -     Entry may be a volume label
         - ATTR_DIRECTORY -  File may be a directory
         - ATTR_ARCHIVE -    File may have archive attribute
         - ATTR_MASK -       All attributes
    rec -             pointer to a structure to put the file information in
  Return Values:
    0 -  File was found
    -1 - No file matching the specified criteria was found
  Side Effects:
    Search criteria from previous FindFirst call on passed SearchRec object
    will be lost.  The FSerrno variable will be changed.
  Description:
    The FindFirst function will search for a file based on parameters passed in
    by the user.  This function will use the FILEfind function to parse through
    the current working directory searching for entries that match the specified 
    parameters.  If a file is found, its parameters are copied into the SearchRec 
    structure, as are the initial parameters passed in by the user and the position 
    of the file entry in the current working directory.
  Remarks:
    Call FindFirst or FindFirstpgm before calling FindNext                          
  ***********************************************************************************/

int FindFirst (const char * fileName, unsigned int attr, SearchRec * rec);


/**********************************************************************
  Function:
    int FindNext (SearchRec * rec)
  Summary:
    Sequential search function
  Conditions:
    None
  Input:
    rec -  The structure to store the file information in
  Return Values:
    0 -  File was found
    -1 - No additional files matching the specified criteria were found
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    The FindNext function performs the same function as the FindFirst
    funciton, except it does not copy any search parameters into the
    SearchRec structure (only info about found files) and it begins
    searching at the last directory entry offset at which a file was
    found, rather than at the beginning of the current working
    directory.
  Remarks:
    Call FindFirst or FindFirstpgm before calling this function        
  **********************************************************************/

int FindNext (SearchRec * rec); 
#endif


/**********************************************************************
  Function:
    // PIC24/30/33/32
    int FSfprintf (FSFILE * fptr, const char * fmt, ...)
    // PIC18
    int FSfpritnf (FSFILE * fptr, const rom char * fmt, ...)
  Summary:
    Function to write formatted strings to a file
  Conditions:
    For PIC18, integer promotion must be enabled in the project build
    options menu.  File opened in a write mode.
  Input:
    fptr - A pointer to the file to write to.
    fmt -  A string of characters and format specifiers to write to
           the file
    ... -  Additional arguments inserted in the string by format
           specifiers
  Returns:
    The number of characters written to the file
  Side Effects:
    The FSerrno variable will be changed.
  Description:
    Writes a specially formatted string to a file.
  Remarks:
    Consult AN1045 for a full description of how to use format
    specifiers.        
  **********************************************************************/

#ifdef ALLOW_FSFPRINTF
    #ifdef __18CXX
        int FSfprintf (FSFILE *fptr, const rom char *fmt, ...);
    #else
        int FSfprintf (FSFILE *fptr, const char * fmt, ...);
    #endif
#endif


/**************************************************************************
  Function:
    int FSerror (void)
  Summary:
    Return an error code for the last function call
  Conditions:
    The return value depends on the last function called.
  Input:
    None
  Side Effects:
    None.
  Return Values:
    FSInit       - 
                 - CE_GOOD                   No Error 
                 - CE_INIT_ERROR             The physical media could not be initialized
                 - CE_BAD_SECTOR_READ        The MBR or the boot sector could not be
                                              read correctly
                 - CE_BAD_PARITION           The MBR signature code was incorrect.
                 - CE_NOT_FORMATTED          The boot sector signature code was incorrect or
                                              indicates an invalid number of bytes per sector. 
                 - CE_CARDFAT32              The physical media is FAT32 type (only an error 
                                              when FAT32 support is disabled). 
                 - CE_UNSUPPORTED_FS         The device is formatted with an unsupported file 
                                              system (not FAT12 or 16).
    FSfopen      -
                 - CE_GOOD                   No Error 
                 - CE_NOT_INIT               The device has not been initialized. 
                 - CE_TOO_MANY_FILES_OPEN    The function could not allocate any 
                                              additional file information to the array 
                                              of FSFILE structures or the heap. 
                 - CE_INVALID_FILENAME       The file name argument was invalid.
                 - CE_INVALID_ARGUMENT       The user attempted to open a directory in a 
                                              write mode or specified an invalid mode argument. 
                 - CE_FILE_NOT_FOUND         The specified file (which was to be opened in read 
                                              mode) does not exist on the device. 
                 - CE_BADCACHEREAD           A read from the device failed.
                 - CE_ERASE_FAIL             The existing file could not be erased (when opening 
                                              a file in WRITE mode). 
                 - CE_DIR_FULL               The directory is full. 
                 - CE_DISK_FULL              The data memory section is full. 
                 - CE_WRITE_ERROR            A write to the device failed. 
                 - CE_SEEK_ERROR             The current position in the file could not be set to 
                                              the end (when the file was opened in APPEND mode).
    FSfclose     - 
                 - CE_GOOD                   No Error 
                 - CE_WRITE_ERROR            The existing data in the data buffer or the new file
                                              entry information could not be written to the device.
                 - CE_BADCACHEREAD           The file entry information could not be cached
    FSfread      - 
                 - CE_GOOD                   No Error 
                 - CE_WRITEONLY              The file was opened in a write-only mode.
                 - CE_WRITE_ERROR            The existing data in the data buffer could not be 
                                              written to the device. 
                 - CE_BAD_SECTOR_READ        The data sector could not be read. 
                 - CE_EOF                    The end of the file was reached.
                 - CE_COULD_NOT_GET_CLUSTER  Additional clusters in the file could not be loaded.
    FSfwrite     - 
                 - CE_GOOD                   No Error 
                 - CE_READONLY               The file was opened in a read-only mode. 
                 - CE_WRITE_PROTECTED        The device write-protect check function indicated 
                                              that the device has been write-protected.
                 - CE_WRITE_ERROR            There was an error writing data to the device.
                 - CE_BADCACHEREAD           The data sector to be modified could not be read from
                                              the device. 
                 - CE_DISK_FULL              All data clusters on the device are in use.
    FSfseek      -
                 - CE_GOOD                   No Error 
                 - CE_WRITE_ERROR            The existing data in the data buffer could not be
                                              written to the device. 
                 - CE_INVALID_ARGUMENT       The specified offset exceeds the size of the file. 
                 - CE_BADCACHEREAD           The sector that contains the new current position 
                                              could not be loaded.
                 - CE_COULD_NOT_GET_CLUSTER  Additional clusters in the file could not be 
                                              loaded/allocated.
    FSftell      - 
                 - CE_GOOD                   No Error
    FSattrib     -
                 - CE_GOOD                   No Error 
                 - CE_INVALID_ARGUMENT       The attribute argument was invalid. 
                 - CE_BADCACHEREAD           The existing file entry information could not be 
                                              loaded. 
                 - CE_WRITE_ERROR            The file entry information could not be written to 
                                              the device.
    FSrename     -
                 - CE_GOOD                   No Error 
                 - CE_FILENOTOPENED          A null file pointer was passed into the function. 
                 - CE_INVALID_FILENAME       The file name passed into the function was invalid. 
                 - CE_BADCACHEREAD           A read from the device failed. 
                 - CE_FILENAME_EXISTS        A file with the specified name already exists. 
                 - CE_WRITE_ERROR            The new file entry data could not be written to the 
                                              device.
    FSfeof       -
                 - CE_GOOD                   No Error
    FSformat     -
                 - CE_GOOD                   No Error 
                 - CE_INIT_ERROR             The device could not be initialized. 
                 - CE_BADCACHEREAD           The master boot record or boot sector could not be 
                                              loaded successfully. 
                 - CE_INVALID_ARGUMENT       The user selected to create their own boot sector on 
                                              a device that has no master boot record, or the mode 
                                              argument was invalid. 
                 - CE_WRITE_ERROR            The updated MBR/Boot sector could not be written to 
                                              the device.
                 - CE_BAD_PARTITION          The calculated number of sectors per clusters was 
                                              invalid. 
                 - CE_NONSUPPORTED_SIZE      The card has too many sectors to be formatted as 
                                              FAT12 or FAT16.
    FSremove     - 
                 - CE_GOOD                   No Error 
                 - CE_WRITE_PROTECTED        The device write-protect check function indicated 
                                              that the device has been write-protected. 
                 - CE_INVALID_FILENAME       The specified filename was invalid. 
                 - CE_FILE_NOT_FOUND         The specified file could not be found.
                 - CE_ERASE_FAIL             The file could not be erased.
    FSchdir      -
                 - CE_GOOD                   No Error 
                 - CE_INVALID_ARGUMENT       The path string was mis-formed or the user tried to 
                                              change to a non-directory file.
                 - CE_BADCACHEREAD           A directory entry could not be cached.
                 - CE_DIR_NOT_FOUND          Could not find a directory in the path.
    FSgetcwd     -
                 - CE_GOOD                   No Error 
                 - CE_INVALID_ARGUMENT       The user passed a 0-length buffer into the function.
                 - CE_BADCACHEREAD           A directory entry could not be cached. 
                 - CE_BAD_SECTOR_READ        The function could not determine a previous directory 
                                              of the current working directory.
    FSmkdir      -
                 - CE_GOOD                   No Error 
                 - CE_WRITE_PROTECTED        The device write-protect check function indicated 
                                              that the device has been write-protected. 
                 - CE_INVALID_ARGUMENT       The path string was mis-formed.
                 - CE_BADCACHEREAD           Could not successfully change to a recently created 
                                              directory to store its dir entry information, or 
                                              could not cache directory entry information. 
                 - CE_INVALID_FILENAME       One or more of the directory names has an invalid 
                                              format. 
                 - CE_WRITE_ERROR            The existing data in the data buffer could not be 
                                              written to the device or the dot/dotdot entries could 
                                              not be written to a newly created directory.
                 - CE_DIR_FULL               There are no available dir entries in the CWD.
                 - CE_DISK_FULL              There are no available clusters in the data region of 
                                              the device.    
    FSrmdir      - 
                 - CE_GOOD                   No Error 
                 - CE_DIR_NOT_FOUND          The directory specified could not be found or the 
                                              function could not change to a subdirectory within 
                                              the directory to be deleted (when recursive delete is 
                                              enabled).
                 - CE_INVALID_ARGUMENT       The user tried to remove the CWD or root directory. 
                 - CE_BADCACHEREAD           A directory entry could not be cached.
                 - CE_DIR_NOT_EMPTY          The directory to be deleted was not empty and 
                                              recursive subdirectory removal was disabled. 
                 - CE_ERASE_FAIL             The directory or one of the directories or files 
                                              within it could not be deleted. 
                 - CE_BAD_SECTOR_READ        The function could not determine a previous directory 
                                              of the CWD.
    SetClockVars -
                 - CE_GOOD                   No Error 
                 - CE_INVALID_ARGUMENT       The time values passed into the function were 
                                              invalid.    
    FindFirst    - 
                 - CE_GOOD                   No Error 
                 - CE_INVALID_FILENAME       The specified filename was invalid. 
                 - CE_FILE_NOT_FOUND         No file matching the specified criteria was found. 
                 - CE_BADCACHEREAD           The file information for the file that was found 
                                              could not be cached.
    FindNext     - 
                 - CE_GOOD                   No Error 
                 - CE_NOT_INIT               The SearchRec object was not initialized by a call to 
                                              FindFirst. 
                 - CE_INVALID_ARGUMENT       The SearchRec object was initialized in a different 
                                              directory from the CWD.
                 - CE_INVALID_FILENAME       The filename is invalid. 
                 - CE_FILE_NOT_FOUND         No file matching the specified criteria was found.
    FSfprintf    - 
                 - CE_GOOD                   No Error 
                 - CE_WRITE_ERROR            Characters could not be written to the file.                                                   
  Description:
    The FSerror function will return the FSerrno variable.  This global
    variable will have been set to an error value during the last call of a
    library function.
  Remarks:
    None
  **************************************************************************/

int FSerror (void);


/*********************************************************************************
  Function:
    int FSCreateMBR (unsigned long firstSector, unsigned long numSectors)
  Summary:
    Creates a master boot record
  Conditions:
    The I/O pins for the device have been initialized by the InitIO function.
  Input:
    firstSector -  The first sector of the partition on the device (cannot
                   be 0; that's the MBR)
    numSectors -   The number of sectors available in memory (including the
                   MBR)
  Return Values:
    0 -   MBR was created successfully
    EOF - MBR could not be created
  Side Effects:
    None
  Description:  
    This function can be used to create a master boot record for a device.  Note
    that this function should not be used on a device that is already formatted
    with a master boot record (i.e. most SD cards, CF cards, USB keys).  This
    function will fill the global data buffer with appropriate partition information
    for a FAT partition with a type determined by the number of sectors available
    to the partition.  It will then write the MBR information to the first sector
    on the device.  This function should be followed by a call to FSformat, which
    will create a boot sector, root dir, and FAT appropriate the the information
    contained in the new master boot record.  Note that FSformat only supports
    FAT12 and FAT16 formatting at this time, and so cannot be used to format a
    device with more than 0x3FFD5F sectors.
  Remarks:
    This function can damage the device being used, and should not be called
    unless the user is sure about the size of the device and the first sector value.
  *********************************************************************************/

int FSCreateMBR (unsigned long firstSector, unsigned long numSectors);

#endif
