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/*----------------------------------------------------------------------------/
/  Petit FatFs - FAT file system module  R0.02a                (C)ChaN, 2010
/-----------------------------------------------------------------------------/
/ Petit FatFs module is an open source software to implement FAT file system to
/ small embedded systems. This is a free software and is opened for education,
/ research and commercial developments under license policy of following trems.
/
/  Copyright (C) 2010, ChaN, all right reserved.
/
/ * The Petit FatFs module is a free software and there is NO WARRANTY.
/ * No restriction on use. You can use, modify and redistribute it for
/   personal, non-profit or commercial use UNDER YOUR RESPONSIBILITY.
/ * Redistributions of source code must retain the above copyright notice.
/
/-----------------------------------------------------------------------------/
/ Jun 15,'09  R0.01a  First release. (Branched from FatFs R0.07b.)
/
/ Dec 14,'09  R0.02   Added multiple code page support.
/                     Added write funciton.
/                     Changed stream read mode interface.
/ Dec 07,'10  R0.02a  Added some configuration options.
/                     Fixed fails to open objects with DBCS character.
/----------------------------------------------------------------------------*/

#include "pff.h"                /* Petit FatFs configurations and declarations */
#include "diskio.h"             /* Declarations of low level disk I/O functions */



/*--------------------------------------------------------------------------

   Module Private Definitions

---------------------------------------------------------------------------*/


#if _FS_FAT32
#define LD_CLUST(dir)   (((DWORD)LD_WORD(dir+DIR_FstClusHI)<<16) | LD_WORD(dir+DIR_FstClusLO))
#else
#define LD_CLUST(dir)   LD_WORD(dir+DIR_FstClusLO)
#endif


/*--------------------------------------------------------*/
/* DBCS code ranges and SBCS extend char conversion table */

#if _CODE_PAGE == 932   /* Japanese Shift-JIS */
#define _DF1S   0x81    /* DBC 1st byte range 1 start */
#define _DF1E   0x9F    /* DBC 1st byte range 1 end */
#define _DF2S   0xE0    /* DBC 1st byte range 2 start */
#define _DF2E   0xFC    /* DBC 1st byte range 2 end */
#define _DS1S   0x40    /* DBC 2nd byte range 1 start */
#define _DS1E   0x7E    /* DBC 2nd byte range 1 end */
#define _DS2S   0x80    /* DBC 2nd byte range 2 start */
#define _DS2E   0xFC    /* DBC 2nd byte range 2 end */

#elif _CODE_PAGE == 936 /* Simplified Chinese GBK */
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x40
#define _DS1E   0x7E
#define _DS2S   0x80
#define _DS2E   0xFE

#elif _CODE_PAGE == 949 /* Korean */
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x41
#define _DS1E   0x5A
#define _DS2S   0x61
#define _DS2E   0x7A
#define _DS3S   0x81
#define _DS3E   0xFE

#elif _CODE_PAGE == 950 /* Traditional Chinese Big5 */
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x40
#define _DS1E   0x7E
#define _DS2S   0xA1
#define _DS2E   0xFE

#elif _CODE_PAGE == 437 /* U.S. (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F,0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 720 /* Arabic (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x45,0x41,0x84,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x8E,0x8F,0x90,0x92,0x92,0x93,0x94,0x95,0x49,0x49,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 737 /* Greek (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x92,0x92,0x93,0x94,0x95,0x96,0x97,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, \
                                0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0xAA,0x92,0x93,0x94,0x95,0x96,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0x97,0xEA,0xEB,0xEC,0xE4,0xED,0xEE,0xE7,0xE8,0xF1,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 775 /* Baltic (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x91,0xA0,0x8E,0x95,0x8F,0x80,0xAD,0xED,0x8A,0x8A,0xA1,0x8D,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0x95,0x96,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xE0,0xA3,0xA3,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xA5,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE3,0xE8,0xE8,0xEA,0xEA,0xEE,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 850 /* Multilingual Latin 1 (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0xDE,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x59,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                                0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE7,0xE9,0xEA,0xEB,0xED,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 852 /* Latin 2 (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xDE,0x8F,0x80,0x9D,0xD3,0x8A,0x8A,0xD7,0x8D,0x8E,0x8F,0x90,0x91,0x91,0xE2,0x99,0x95,0x95,0x97,0x97,0x99,0x9A,0x9B,0x9B,0x9D,0x9E,0x9F, \
                                0xB5,0xD6,0xE0,0xE9,0xA4,0xA4,0xA6,0xA6,0xA8,0xA8,0xAA,0x8D,0xAC,0xB8,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBD,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC6,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD2,0xD3,0xD2,0xD5,0xD6,0xD7,0xB7,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE3,0xD5,0xE6,0xE6,0xE8,0xE9,0xE8,0xEB,0xED,0xED,0xDD,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xEB,0xFC,0xFC,0xFE,0xFF}

#elif _CODE_PAGE == 855 /* Cyrillic (OEM) */
#define _DF1S   0
#define _EXCVT {0x81,0x81,0x83,0x83,0x85,0x85,0x87,0x87,0x89,0x89,0x8B,0x8B,0x8D,0x8D,0x8F,0x8F,0x91,0x91,0x93,0x93,0x95,0x95,0x97,0x97,0x99,0x99,0x9B,0x9B,0x9D,0x9D,0x9F,0x9F, \
                                0xA1,0xA1,0xA3,0xA3,0xA5,0xA5,0xA7,0xA7,0xA9,0xA9,0xAB,0xAB,0xAD,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB6,0xB6,0xB8,0xB8,0xB9,0xBA,0xBB,0xBC,0xBE,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD3,0xD3,0xD5,0xD5,0xD7,0xD7,0xDD,0xD9,0xDA,0xDB,0xDC,0xDD,0xE0,0xDF, \
                                0xE0,0xE2,0xE2,0xE4,0xE4,0xE6,0xE6,0xE8,0xE8,0xEA,0xEA,0xEC,0xEC,0xEE,0xEE,0xEF,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 857 /* Turkish (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x98,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x98,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9E, \
                                0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0x59,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 858 /* Multilingual Latin 1 + Euro (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0xDE,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x59,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                                0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE7,0xE9,0xEA,0xEB,0xED,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 862 /* Hebrew (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 866 /* Russian (OEM) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0x90,0x91,0x92,0x93,0x9d,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 874 /* Thai (OEM, Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1250 /* Central Europe (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x8D,0x8E,0x8F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xA3,0xB4,0xB5,0xB6,0xB7,0xB8,0xA5,0xAA,0xBB,0xBC,0xBD,0xBC,0xAF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xFF}

#elif _CODE_PAGE == 1251 /* Cyrillic (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x82,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x80,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x8D,0x8E,0x8F, \
                                0xA0,0xA2,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB2,0xA5,0xB5,0xB6,0xB7,0xA8,0xB9,0xAA,0xBB,0xA3,0xBD,0xBD,0xAF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF}

#elif _CODE_PAGE == 1252 /* Latin 1 (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0xAd,0x9B,0x8C,0x9D,0xAE,0x9F, \
                                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0x9F}

#elif _CODE_PAGE == 1253 /* Greek (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xA2,0xB8,0xB9,0xBA, \
                                0xE0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xF2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xFB,0xBC,0xFD,0xBF,0xFF}

#elif _CODE_PAGE == 1254 /* Turkish (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x9D,0x9E,0x9F, \
                                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0x9F}

#elif _CODE_PAGE == 1255 /* Hebrew (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1256 /* Arabic (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x8C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0x41,0xE1,0x41,0xE3,0xE4,0xE5,0xE6,0x43,0x45,0x45,0x45,0x45,0xEC,0xED,0x49,0x49,0xF0,0xF1,0xF2,0xF3,0x4F,0xF5,0xF6,0xF7,0xF8,0x55,0xFA,0x55,0x55,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1257 /* Baltic (Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xA8,0xB9,0xAA,0xBB,0xBC,0xBD,0xBE,0xAF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xFF}

#elif _CODE_PAGE == 1258 /* Vietnam (OEM, Windows) */
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0xAC,0x9D,0x9E,0x9F, \
                                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xEC,0xCD,0xCE,0xCF,0xD0,0xD1,0xF2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xFE,0x9F}

#elif _CODE_PAGE == 1   /* ASCII (for only non-LFN cfg) */
#define _DF1S   0

#else
#error Unknown code page

#endif



/* Character code support macros */

#define IsUpper(c)      (((c)>='A')&&((c)<='Z'))
#define IsLower(c)      (((c)>='a')&&((c)<='z'))

#if _DF1S               /* DBCS configuration */

#ifdef _DF2S    /* Two 1st byte areas */
#define IsDBCS1(c)      (((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E) || ((BYTE)(c) >= _DF2S && (BYTE)(c) <= _DF2E))
#else                   /* One 1st byte area */
#define IsDBCS1(c)      ((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E)
#endif

#ifdef _DS3S    /* Three 2nd byte areas */
#define IsDBCS2(c)      (((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E) || ((BYTE)(c) >= _DS3S && (BYTE)(c) <= _DS3E))
#else                   /* Two 2nd byte areas */
#define IsDBCS2(c)      (((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E))
#endif

#else                   /* SBCS configuration */

#define IsDBCS1(c)      0
#define IsDBCS2(c)      0

#endif /* _DF1S */


/* FatFs refers the members in the FAT structures with byte offset instead
/ of structure member because there are incompatibility of the packing option
/ between various compilers. */

#define BS_jmpBoot                      0
#define BS_OEMName                      3
#define BPB_BytsPerSec          11
#define BPB_SecPerClus          13
#define BPB_RsvdSecCnt          14
#define BPB_NumFATs                     16
#define BPB_RootEntCnt          17
#define BPB_TotSec16            19
#define BPB_Media                       21
#define BPB_FATSz16                     22
#define BPB_SecPerTrk           24
#define BPB_NumHeads            26
#define BPB_HiddSec                     28
#define BPB_TotSec32            32
#define BS_55AA                         510

#define BS_DrvNum                       36
#define BS_BootSig                      38
#define BS_VolID                        39
#define BS_VolLab                       43
#define BS_FilSysType           54

#define BPB_FATSz32                     36
#define BPB_ExtFlags            40
#define BPB_FSVer                       42
#define BPB_RootClus            44
#define BPB_FSInfo                      48
#define BPB_BkBootSec           50
#define BS_DrvNum32                     64
#define BS_BootSig32            66
#define BS_VolID32                      67
#define BS_VolLab32                     71
#define BS_FilSysType32         82

#define MBR_Table                       446

#define DIR_Name                        0
#define DIR_Attr                        11
#define DIR_NTres                       12
#define DIR_CrtTime                     14
#define DIR_CrtDate                     16
#define DIR_FstClusHI           20
#define DIR_WrtTime                     22
#define DIR_WrtDate                     24
#define DIR_FstClusLO           26
#define DIR_FileSize            28



/*--------------------------------------------------------------------------

   Private Functions

---------------------------------------------------------------------------*/


static
FATFS *FatFs;   /* Pointer to the file system object (logical drive) */


/* Fill memory */
static
void mem_set (void* dst, int val, int cnt) {
        char *d = (char*)dst;
        while (cnt--) *d++ = (char)val;
}

/* Compare memory to memory */
static
int mem_cmp (const void* dst, const void* src, int cnt) {
        const char *d = (const char *)dst, *s = (const char *)src;
        int r = 0;
        while (cnt-- && (r = *d++ - *s++) == 0) ;
        return r;
}



/*-----------------------------------------------------------------------*/
/* FAT access - Read value of a FAT entry                                */
/*-----------------------------------------------------------------------*/

static
CLUST get_fat ( /* 1:IO error, Else:Cluster status */
        CLUST clst      /* Cluster# to get the link information */
)
{
        WORD wc, bc, ofs;
        BYTE buf[4];
        FATFS *fs = FatFs;


        if (clst < 2 || clst >= fs->n_fatent)   /* Range check */
                return 1;

        switch (fs->fs_type) {
#if _FS_FAT12
        case FS_FAT12 :
                bc = (WORD)clst; bc += bc / 2;
                ofs = bc % 512; bc /= 512;
                if (ofs != 511) {
                        if (disk_readp(buf, fs->fatbase + bc, ofs, 2)) break;
                } else {
                        if (disk_readp(buf, fs->fatbase + bc, 511, 1)) break;
                        if (disk_readp(buf+1, fs->fatbase + bc + 1, 0, 1)) break;
                }
                wc = LD_WORD(buf);
                return (clst & 1) ? (wc >> 4) : (wc & 0xFFF);
#endif
        case FS_FAT16 :
                if (disk_readp(buf, fs->fatbase + clst / 256, (WORD)(((WORD)clst % 256) * 2), 2)) break;
                return LD_WORD(buf);
#if _FS_FAT32
        case FS_FAT32 :
                if (disk_readp(buf, fs->fatbase + clst / 128, (WORD)(((WORD)clst % 128) * 4), 4)) break;
                return LD_DWORD(buf) & 0x0FFFFFFF;
#endif
        }

        return 1;       /* An error occured at the disk I/O layer */
}




/*-----------------------------------------------------------------------*/
/* Get sector# from cluster#                                             */
/*-----------------------------------------------------------------------*/

static
DWORD clust2sect (      /* !=0: Sector number, 0: Failed - invalid cluster# */
        CLUST clst              /* Cluster# to be converted */
)
{
        FATFS *fs = FatFs;


        clst -= 2;
        if (clst >= (fs->n_fatent - 2)) return 0;               /* Invalid cluster# */
        return (DWORD)clst * fs->csize + fs->database;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Rewind directory index                           */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_rewind (
        DIR *dj                 /* Pointer to directory object */
)
{
        CLUST clst;
        FATFS *fs = FatFs;


        dj->index = 0;
        clst = dj->sclust;
        if (clst == 1 || clst >= fs->n_fatent)  /* Check start cluster range */
                return FR_DISK_ERR;
        if (_FS_FAT32 && !clst && fs->fs_type == FS_FAT32)      /* Replace cluster# 0 with root cluster# if in FAT32 */
                clst = (CLUST)fs->dirbase;
        dj->clust = clst;                                               /* Current cluster */
        dj->sect = clst ? clust2sect(clst) : fs->dirbase;       /* Current sector */

        return FR_OK;   /* Seek succeeded */
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Move directory index next                        */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_next (      /* FR_OK:Succeeded, FR_NO_FILE:End of table */
        DIR *dj                 /* Pointer to directory object */
)
{
        CLUST clst;
        WORD i;
        FATFS *fs = FatFs;


        i = dj->index + 1;
        if (!i || !dj->sect)    /* Report EOT when index has reached 65535 */
                return FR_NO_FILE;

        if (!(i % 16)) {                /* Sector changed? */
                dj->sect++;                     /* Next sector */

                if (dj->clust == 0) {   /* Static table */
                        if (i >= fs->n_rootdir) /* Report EOT when end of table */
                                return FR_NO_FILE;
                }
                else {                                  /* Dynamic table */
                        if (((i / 16) & (fs->csize-1)) == 0) {  /* Cluster changed? */
                                clst = get_fat(dj->clust);              /* Get next cluster */
                                if (clst <= 1) return FR_DISK_ERR;
                                if (clst >= fs->n_fatent)               /* When it reached end of dynamic table */
                                        return FR_NO_FILE;                      /* Report EOT */
                                dj->clust = clst;                               /* Initialize data for new cluster */
                                dj->sect = clust2sect(clst);
                        }
                }
        }

        dj->index = i;

        return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Find an object in the directory                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_find (
        DIR *dj,                /* Pointer to the directory object linked to the file name */
        BYTE *dir               /* 32-byte working buffer */
)
{
        FRESULT res;
        BYTE c;


        res = dir_rewind(dj);                   /* Rewind directory object */
        if (res != FR_OK) return res;

        do {
                res = disk_readp(dir, dj->sect, (WORD)((dj->index % 16) * 32), 32)      /* Read an entry */
                        ? FR_DISK_ERR : FR_OK;
                if (res != FR_OK) break;
                c = dir[DIR_Name];      /* First character */
                if (c == 0) { res = FR_NO_FILE; break; }        /* Reached to end of table */
                if (!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dj->fn, 11)) /* Is it a valid entry? */
                        break;
                res = dir_next(dj);                                     /* Next entry */
        } while (res == FR_OK);

        return res;
}




/*-----------------------------------------------------------------------*/
/* Read an object from the directory                                     */
/*-----------------------------------------------------------------------*/
#if _USE_DIR
static
FRESULT dir_read (
        DIR *dj,                /* Pointer to the directory object to store read object name */
        BYTE *dir               /* 32-byte working buffer */
)
{
        FRESULT res;
        BYTE a, c;


        res = FR_NO_FILE;
        while (dj->sect) {
                res = disk_readp(dir, dj->sect, (WORD)((dj->index % 16) * 32), 32)      /* Read an entry */
                        ? FR_DISK_ERR : FR_OK;
                if (res != FR_OK) break;
                c = dir[DIR_Name];
                if (c == 0) { res = FR_NO_FILE; break; }        /* Reached to end of table */
                a = dir[DIR_Attr] & AM_MASK;
                if (c != 0xE5 && c != '.' && !(a & AM_VOL))     /* Is it a valid entry? */
                        break;
                res = dir_next(dj);                     /* Next entry */
                if (res != FR_OK) break;
        }

        if (res != FR_OK) dj->sect = 0;

        return res;
}
#endif



/*-----------------------------------------------------------------------*/
/* Pick a segment and create the object name in directory form           */
/*-----------------------------------------------------------------------*/

#ifdef _EXCVT
        static const BYTE cvt[] = _EXCVT;
#endif

static
FRESULT create_name (
        DIR *dj,                        /* Pointer to the directory object */
        const char **path       /* Pointer to pointer to the segment in the path string */
)
{
        BYTE c, d, ni, si, i, *sfn;
        const char *p;

        /* Create file name in directory form */
        sfn = dj->fn;
        mem_set(sfn, ' ', 11);
        si = i = 0; ni = 8;
        p = *path;
        for (;;) {
                c = p[si++];
                if (c <= ' ' || c == '/') break;        /* Break on end of segment */
                if (c == '.' || i >= ni) {
                        if (ni != 8 || c != '.') break;
                        i = 8; ni = 11;
                        continue;
                }
#ifdef _EXCVT
                if (c >= 0x80)                                  /* To upper extended char (SBCS) */
                        c = cvt[c - 0x80];
#endif
                if (IsDBCS1(c) && i < ni - 1) { /* DBC 1st byte? */
                        d = p[si++];                            /* Get 2nd byte */
                        sfn[i++] = c;
                        sfn[i++] = d;
                } else {                                                /* Single byte code */
                        if (IsLower(c)) c -= 0x20;      /* toupper */
                        sfn[i++] = c;
                }
        }
        *path = &p[si];                                         /* Rerurn pointer to the next segment */

        sfn[11] = (c <= ' ') ? 1 : 0;           /* Set last segment flag if end of path */

        return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Get file information from directory entry                             */
/*-----------------------------------------------------------------------*/
#if _USE_DIR
static
void get_fileinfo (             /* No return code */
        DIR *dj,                        /* Pointer to the directory object */
        BYTE *dir,                      /* 32-byte working buffer */
        FILINFO *fno            /* Pointer to store the file information */
)
{
        BYTE i, c;
        char *p;


        p = fno->fname;
        if (dj->sect) {
                for (i = 0; i < 8; i++) {       /* Copy file name body */
                        c = dir[i];
                        if (c == ' ') break;
                        if (c == 0x05) c = 0xE5;
                        *p++ = c;
                }
                if (dir[8] != ' ') {            /* Copy file name extension */
                        *p++ = '.';
                        for (i = 8; i < 11; i++) {
                                c = dir[i];
                                if (c == ' ') break;
                                *p++ = c;
                        }
                }
                fno->fattrib = dir[DIR_Attr];                           /* Attribute */
                fno->fsize = LD_DWORD(dir+DIR_FileSize);        /* Size */
                fno->fdate = LD_WORD(dir+DIR_WrtDate);          /* Date */
                fno->ftime = LD_WORD(dir+DIR_WrtTime);          /* Time */
        }
        *p = 0;
}
#endif /* _USE_DIR */



/*-----------------------------------------------------------------------*/
/* Follow a file path                                                    */
/*-----------------------------------------------------------------------*/

static
FRESULT follow_path (   /* FR_OK(0): successful, !=0: error code */
        DIR *dj,                        /* Directory object to return last directory and found object */
        BYTE *dir,                      /* 32-byte working buffer */
        const char *path        /* Full-path string to find a file or directory */
)
{
        FRESULT res;


        while (*path == ' ') path++;            /* Skip leading spaces */
        if (*path == '/') path++;                       /* Strip heading separator */
        dj->sclust = 0;                                         /* Set start directory (always root dir) */

        if ((BYTE)*path <= ' ') {                       /* Null path means the root directory */
                res = dir_rewind(dj);
                dir[0] = 0;

        } else {                                                        /* Follow path */
                for (;;) {
                        res = create_name(dj, &path);   /* Get a segment */
                        if (res != FR_OK) break;
                        res = dir_find(dj, dir);                /* Find it */
                        if (res != FR_OK) {                             /* Could not find the object */
                                if (res == FR_NO_FILE && !*(dj->fn+11))
                                        res = FR_NO_PATH;
                                break;
                        }
                        if (*(dj->fn+11)) break;                /* Last segment match. Function completed. */
                        if (!(dir[DIR_Attr] & AM_DIR)) { /* Cannot follow because it is a file */
                                res = FR_NO_PATH; break;
                        }
                        dj->sclust = LD_CLUST(dir);
                }
        }

        return res;
}




/*-----------------------------------------------------------------------*/
/* Check a sector if it is an FAT boot record                            */
/*-----------------------------------------------------------------------*/

static
BYTE check_fs ( /* 0:The FAT boot record, 1:Valid boot record but not an FAT, 2:Not a boot record, 3:Error */
        BYTE *buf,      /* Working buffer */
        DWORD sect      /* Sector# (lba) to check if it is an FAT boot record or not */
)
{
        if (disk_readp(buf, sect, 510, 2))              /* Read the boot sector */
                return 3;
        if (LD_WORD(buf) != 0xAA55)                             /* Check record signature */
                return 2;

        if (!disk_readp(buf, sect, BS_FilSysType, 2) && LD_WORD(buf) == 0x4146) /* Check FAT12/16 */
                return 0;
        if (_FS_FAT32 && !disk_readp(buf, sect, BS_FilSysType32, 2) && LD_WORD(buf) == 0x4146)  /* Check FAT32 */
                return 0;
        return 1;
}




/*--------------------------------------------------------------------------

   Public Functions

--------------------------------------------------------------------------*/



/*-----------------------------------------------------------------------*/
/* Mount/Unmount a Locical Drive                                         */
/*-----------------------------------------------------------------------*/

FRESULT pf_mount (
        FATFS *fs               /* Pointer to new file system object (NULL: Unmount) */
)
{
        BYTE fmt, buf[36];
        DWORD bsect, fsize, tsect, mclst;


        FatFs = 0;
        if (!fs) return FR_OK;                          /* Unregister fs object */

        if (disk_initialize() & STA_NOINIT)     /* Check if the drive is ready or not */
                return FR_NOT_READY;

        /* Search FAT partition on the drive */
        bsect = 0;
        fmt = check_fs(buf, bsect);                     /* Check sector 0 as an SFD format */
        if (fmt == 1) {                                         /* Not an FAT boot record, it may be FDISK format */
                /* Check a partition listed in top of the partition table */
                if (disk_readp(buf, bsect, MBR_Table, 16)) {    /* 1st partition entry */
                        fmt = 3;
                } else {
                        if (buf[4]) {                                   /* Is the partition existing? */
                                bsect = LD_DWORD(&buf[8]);      /* Partition offset in LBA */
                                fmt = check_fs(buf, bsect);     /* Check the partition */
                        }
                }
        }
        if (fmt == 3) return FR_DISK_ERR;
        if (fmt) return FR_NO_FILESYSTEM;       /* No valid FAT patition is found */

        /* Initialize the file system object */
        if (disk_readp(buf, bsect, 13, sizeof(buf))) return FR_DISK_ERR;

        fsize = LD_WORD(buf+BPB_FATSz16-13);                            /* Number of sectors per FAT */
        if (!fsize) fsize = LD_DWORD(buf+BPB_FATSz32-13);

        fsize *= buf[BPB_NumFATs-13];                                           /* Number of sectors in FAT area */
        fs->fatbase = bsect + LD_WORD(buf+BPB_RsvdSecCnt-13); /* FAT start sector (lba) */
        fs->csize = buf[BPB_SecPerClus-13];                                     /* Number of sectors per cluster */
        fs->n_rootdir = LD_WORD(buf+BPB_RootEntCnt-13);         /* Nmuber of root directory entries */
        tsect = LD_WORD(buf+BPB_TotSec16-13);                           /* Number of sectors on the file system */
        if (!tsect) tsect = LD_DWORD(buf+BPB_TotSec32-13);
        mclst = (tsect                                          /* Last cluster# + 1 */
                - LD_WORD(buf+BPB_RsvdSecCnt-13) - fsize - fs->n_rootdir / 16
                ) / fs->csize + 2;
        fs->n_fatent = (CLUST)mclst;

        fmt = FS_FAT16;                                                 /* Determine the FAT sub type */
        if (mclst < 0xFF7)                                              /* Number of clusters < 0xFF5 */
#if _FS_FAT12
                fmt = FS_FAT12;
#else
                return FR_NO_FILESYSTEM;
#endif
        if (mclst >= 0xFFF7)                                    /* Number of clusters >= 0xFFF5 */
#if _FS_FAT32
                fmt = FS_FAT32;
#else
                return FR_NO_FILESYSTEM;
#endif

        fs->fs_type = fmt;              /* FAT sub-type */
        if (_FS_FAT32 && fmt == FS_FAT32)
                fs->dirbase = LD_DWORD(buf+(BPB_RootClus-13));  /* Root directory start cluster */
        else
                fs->dirbase = fs->fatbase + fsize;                              /* Root directory start sector (lba) */
        fs->database = fs->fatbase + fsize + fs->n_rootdir / 16;        /* Data start sector (lba) */

        fs->flag = 0;
        FatFs = fs;

        return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Open or Create a File                                                 */
/*-----------------------------------------------------------------------*/

FRESULT pf_open (
        const char *path        /* Pointer to the file name */
)
{
        FRESULT res;
        DIR dj;
        BYTE sp[12], dir[32];
        FATFS *fs = FatFs;


        if (!fs)                                                /* Check file system */
                return FR_NOT_ENABLED;

        fs->flag = 0;
        dj.fn = sp;
        res = follow_path(&dj, dir, path);      /* Follow the file path */
        if (res != FR_OK) return res;           /* Follow failed */
        if (!dir[0] || (dir[DIR_Attr] & AM_DIR))        /* It is a directory */
                return FR_NO_FILE;

        fs->org_clust = LD_CLUST(dir);                  /* File start cluster */
        fs->fsize = LD_DWORD(dir+DIR_FileSize); /* File size */
        fs->fptr = 0;                                           /* File pointer */
        fs->flag = FA_OPENED;

        return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Read File                                                             */
/*-----------------------------------------------------------------------*/
#if _USE_READ

FRESULT pf_read (
        void* buff,             /* Pointer to the read buffer (NULL:Forward data to the stream)*/
        WORD btr,               /* Number of bytes to read */
        WORD* br                /* Pointer to number of bytes read */
)
{
        DRESULT dr;
        CLUST clst;
        DWORD sect, remain;
        WORD rcnt;
        BYTE cs, *rbuff = buff;
        FATFS *fs = FatFs;


        *br = 0;
        if (!fs) return FR_NOT_ENABLED;         /* Check file system */
        if (!(fs->flag & FA_OPENED))            /* Check if opened */
                return FR_NOT_OPENED;

        remain = fs->fsize - fs->fptr;
        if (btr > remain) btr = (WORD)remain;                   /* Truncate btr by remaining bytes */

        while (btr)     {                                                                       /* Repeat until all data transferred */
                if ((fs->fptr % 512) == 0) {                            /* On the sector boundary? */
                        cs = (BYTE)(fs->fptr / 512 & (fs->csize - 1));  /* Sector offset in the cluster */
                        if (!cs) {                                                              /* On the cluster boundary? */
                                clst = (fs->fptr == 0) ?                        /* On the top of the file? */
                                        fs->org_clust : get_fat(fs->curr_clust);
                                if (clst <= 1) goto fr_abort;
                                fs->curr_clust = clst;                          /* Update current cluster */
                        }
                        sect = clust2sect(fs->curr_clust);              /* Get current sector */
                        if (!sect) goto fr_abort;
                        fs->dsect = sect + cs;
                }
                rcnt = (WORD)(512 - (fs->fptr % 512));          /* Get partial sector data from sector buffer */
                if (rcnt > btr) rcnt = btr;
                dr = disk_readp(!buff ? 0 : rbuff, fs->dsect, (WORD)(fs->fptr % 512), rcnt);
                if (dr) goto fr_abort;
                fs->fptr += rcnt; rbuff += rcnt;                        /* Update pointers and counters */
                btr -= rcnt; *br += rcnt;
        }

        return FR_OK;

fr_abort:
        fs->flag = 0;
        return FR_DISK_ERR;
}
#endif



/*-----------------------------------------------------------------------*/
/* Write File                                                            */
/*-----------------------------------------------------------------------*/
#if _USE_WRITE

FRESULT pf_write (
        const void* buff,       /* Pointer to the data to be written */
        WORD btw,                       /* Number of bytes to write (0:Finalize the current write operation) */
        WORD* bw                        /* Pointer to number of bytes written */
)
{
        CLUST clst;
        DWORD sect, remain;
        const BYTE *p = buff;
        BYTE cs;
        WORD wcnt;
        FATFS *fs = FatFs;


        *bw = 0;
        if (!fs) return FR_NOT_ENABLED;         /* Check file system */
        if (!(fs->flag & FA_OPENED))            /* Check if opened */
                return FR_NOT_OPENED;

        if (!btw) {             /* Finalize request */
                if ((fs->flag & FA__WIP) && disk_writep(0, 0)) goto fw_abort;
                fs->flag &= ~FA__WIP;
                return FR_OK;
        } else {                /* Write data request */
                if (!(fs->flag & FA__WIP))              /* Round-down fptr to the sector boundary */
                        fs->fptr &= 0xFFFFFE00;
        }
        remain = fs->fsize - fs->fptr;
        if (btw > remain) btw = (WORD)remain;                   /* Truncate btw by remaining bytes */

        while (btw)     {                                                                       /* Repeat until all data transferred */
                if (((WORD)fs->fptr % 512) == 0) {                      /* On the sector boundary? */
                        cs = (BYTE)(fs->fptr / 512 & (fs->csize - 1));  /* Sector offset in the cluster */
                        if (!cs) {                                                              /* On the cluster boundary? */
                                clst = (fs->fptr == 0) ?                        /* On the top of the file? */
                                        fs->org_clust : get_fat(fs->curr_clust);
                                if (clst <= 1) goto fw_abort;
                                fs->curr_clust = clst;                          /* Update current cluster */
                        }
                        sect = clust2sect(fs->curr_clust);              /* Get current sector */
                        if (!sect) goto fw_abort;
                        fs->dsect = sect + cs;
                        if (disk_writep(0, fs->dsect)) goto fw_abort;   /* Initiate a sector write operation */
                        fs->flag |= FA__WIP;
                }
                wcnt = 512 - ((WORD)fs->fptr % 512);            /* Number of bytes to write to the sector */
                if (wcnt > btw) wcnt = btw;
                if (disk_writep(p, wcnt)) goto fw_abort;        /* Send data to the sector */
                fs->fptr += wcnt; p += wcnt;                            /* Update pointers and counters */
                btw -= wcnt; *bw += wcnt;
                if (((WORD)fs->fptr % 512) == 0) {
                        if (disk_writep(0, 0)) goto fw_abort;   /* Finalize the currtent secter write operation */
                        fs->flag &= ~FA__WIP;
                }
        }

        return FR_OK;

fw_abort:
        fs->flag = 0;
        return FR_DISK_ERR;
}
#endif



/*-----------------------------------------------------------------------*/
/* Seek File R/W Pointer                                                 */
/*-----------------------------------------------------------------------*/
#if _USE_LSEEK

FRESULT pf_lseek (
        DWORD ofs               /* File pointer from top of file */
)
{
        CLUST clst;
        DWORD bcs, sect, ifptr;
        FATFS *fs = FatFs;


        if (!fs) return FR_NOT_ENABLED;         /* Check file system */
        if (!(fs->flag & FA_OPENED))            /* Check if opened */
                        return FR_NOT_OPENED;

        if (ofs > fs->fsize) ofs = fs->fsize;   /* Clip offset with the file size */
        ifptr = fs->fptr;
        fs->fptr = 0;
        if (ofs > 0) {
                bcs = (DWORD)fs->csize * 512;   /* Cluster size (byte) */
                if (ifptr > 0 &&
                        (ofs - 1) / bcs >= (ifptr - 1) / bcs) { /* When seek to same or following cluster, */
                        fs->fptr = (ifptr - 1) & ~(bcs - 1);    /* start from the current cluster */
                        ofs -= fs->fptr;
                        clst = fs->curr_clust;
                } else {                                                        /* When seek to back cluster, */
                        clst = fs->org_clust;                   /* start from the first cluster */
                        fs->curr_clust = clst;
                }
                while (ofs > bcs) {                             /* Cluster following loop */
                        clst = get_fat(clst);           /* Follow cluster chain */
                        if (clst <= 1 || clst >= fs->n_fatent) goto fe_abort;
                        fs->curr_clust = clst;
                        fs->fptr += bcs;
                        ofs -= bcs;
                }
                fs->fptr += ofs;
                sect = clust2sect(clst);                /* Current sector */
                if (!sect) goto fe_abort;
                fs->dsect = sect + (fs->fptr / 512 & (fs->csize - 1));
        }

        return FR_OK;

fe_abort:
        fs->flag = 0;
        return FR_DISK_ERR;
}
#endif



/*-----------------------------------------------------------------------*/
/* Create a Directroy Object                                             */
/*-----------------------------------------------------------------------*/
#if _USE_DIR

FRESULT pf_opendir (
        DIR *dj,                        /* Pointer to directory object to create */
        const char *path        /* Pointer to the directory path */
)
{
        FRESULT res;
        BYTE sp[12], dir[32];
        FATFS *fs = FatFs;


        if (!fs) {                              /* Check file system */
                res = FR_NOT_ENABLED;
        } else {
                dj->fn = sp;
                res = follow_path(dj, dir, path);               /* Follow the path to the directory */
                if (res == FR_OK) {                                             /* Follow completed */
                        if (dir[0]) {                                           /* It is not the root dir */
                                if (dir[DIR_Attr] & AM_DIR)             /* The object is a directory */
                                        dj->sclust = LD_CLUST(dir);
                                else                                                    /* The object is not a directory */
                                        res = FR_NO_PATH;
                        }
                        if (res == FR_OK)
                                res = dir_rewind(dj);                   /* Rewind dir */
                }
                if (res == FR_NO_FILE) res = FR_NO_PATH;
        }

        return res;
}




/*-----------------------------------------------------------------------*/
/* Read Directory Entry in Sequense                                      */
/*-----------------------------------------------------------------------*/

FRESULT pf_readdir (
        DIR *dj,                        /* Pointer to the open directory object */
        FILINFO *fno            /* Pointer to file information to return */
)
{
        FRESULT res;
        BYTE sp[12], dir[32];
        FATFS *fs = FatFs;


        if (!fs) {                              /* Check file system */
                res = FR_NOT_ENABLED;
        } else {
                dj->fn = sp;
                if (!fno) {
                        res = dir_rewind(dj);
                } else {
                        res = dir_read(dj, dir);
                        if (res == FR_NO_FILE) {
                                dj->sect = 0;
                                res = FR_OK;
                        }
                        if (res == FR_OK) {                             /* A valid entry is found */
                                get_fileinfo(dj, dir, fno);     /* Get the object information */
                                res = dir_next(dj);                     /* Increment index for next */
                                if (res == FR_NO_FILE) {
                                        dj->sect = 0;
                                        res = FR_OK;
                                }
                        }
                }
        }

        return res;
}

#endif /* _USE_DIR */