ff.c.bak

An complete pmp solution for mattel juicebox player. Using crossworks for arm.

/*--------------------------------------------------------------------------/
/  FatFs - FAT file system module  R0.03a                    (C)ChaN, 2006
/---------------------------------------------------------------------------/
/ FatFs module is an experimenal project to implement FAT file system to
/ cheap microcontrollers. This is a free software and is opened for education,
/ research and development under license policy of following trems.
/
/  Copyright (C) 2006, ChaN, all right reserved.
/
/ * The FatFs module is a free software and there is no warranty.
/ * You can use, modify and/or redistribute it for personal, non-profit or
/   profit use without any restriction under your responsibility.
/ * Redistributions of source code must retain the above copyright notice.
/
/---------------------------------------------------------------------------/
/  Feb 26, 2006  R0.00  Prototype.
/  Apr 29, 2006  R0.01  First stable version.
/  Jun 01, 2006  R0.02  Added FAT12. Removed unbuffered mode.
/                       Fixed a problem on small (<32M) patition.
/  Jun 10, 2006  R0.02a Added a configuration option (_FS_MINIMUM).
/  Sep 22, 2006  R0.03  Added wFileRename().
/                       Changed option _FS_MINIMUM to _FS_MINIMIZE.
/  Dec 11, 2006  R0.03a Improved cluster scan algolithm to write files fast.
/                       Fixed wDirMake() creates incorrect directory on FAT32.
/---------------------------------------------------------------------------*/

#include <string.h>
#include "ff.h"			/* FatFs declarations */



FATFS *FatFs;			/* Pointer to the file system object */


/*-------------------------------------------------------------------------
  Module Private Functions
-------------------------------------------------------------------------*/

/*----------------------*/
/* Change Window Offset */

static
BOOL prvMoveWindow (
	DWORD sector		/* Sector number to make apperance in the FatFs->win */
)						/* Move to zero only writes back dirty window */
{
	DWORD wsect;
	FATFS *fs = FatFs;


	wsect = fs->winsect;
	if (wsect != sector) {	/* Changed current window */
#ifndef _FS_READONLY
		BYTE n;
		if (fs->winflag) {	/* Write back dirty window if needed */
			if (wDiskWrite(fs->win, wsect, 1) != RES_OK) return FALSE;
			fs->winflag = 0;
			if (wsect < (fs->fatbase + fs->sects_fat)) {	/* In FAT area */
				for (n = fs->n_fats; n >= 2; n--) {	/* Refrect the change to all FAT copies */
					wsect += fs->sects_fat;
					if (wDiskWrite(fs->win, wsect, 1) != RES_OK) break;
				}
			}
		}
#endif
		if (sector) {
			if (wDiskRead(fs->win, sector, 1) != RES_OK) return FALSE;
			fs->winsect = sector;
		}
	}
	return TRUE;
}



/*----------------------*/
/* Get a Cluster Status */

static
DWORD prvGetCluster (
	DWORD clust			/* Cluster# to get the link information */
)
{
	WORD wc, bc;
	DWORD fatsect;
	FATFS *fs = FatFs;


	if ((clust >= 2) && (clust < fs->max_clust)) {		/* Valid cluster# */
		fatsect = fs->fatbase;
		switch (fs->fs_type) {
		case FS_FAT12 :
			bc = (WORD)clust * 3 / 2;
			if (!prvMoveWindow(fatsect + bc / 512)) break;
			wc = fs->win[bc % 512]; bc++;
			if (!prvMoveWindow(fatsect + bc / 512)) break;
			wc |= (WORD)fs->win[bc % 512] << 8;
			return (clust & 1) ? (wc >> 4) : (wc & 0xFFF);

		case FS_FAT16 :
			if (!prvMoveWindow(fatsect + clust / 256)) break;
			return LD_WORD(&(fs->win[((WORD)clust * 2) % 512]));

		case FS_FAT32 :
			if (!prvMoveWindow(fatsect + clust / 128)) break;
			return LD_DWORD(&(fs->win[((WORD)clust * 4) % 512])) & 0x0FFFFFFF;
		}
	}
	return 1;	/* There is no cluster information, or an error occured */
}



/*--------------------------*/
/* Change a Cluster Status  */

#ifndef _FS_READONLY
static
BOOL prvPutCluster (
	DWORD clust,		/* Cluster# to change */
	DWORD val			/* New value to mark the cluster */
)
{
	WORD bc;
	BYTE *p;
	DWORD fatsect;
	FATFS *fs = FatFs;


	fatsect = fs->fatbase;
	switch (fs->fs_type) {
	case FS_FAT12 :
		bc = (WORD)clust * 3 / 2;
		if (!prvMoveWindow(fatsect + bc / 512)) return FALSE;
		p = &fs->win[bc % 512];
		*p = (clust & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;
		bc++;
		fs->winflag = 1;
		if (!prvMoveWindow(fatsect + bc / 512)) return FALSE;
		p = &fs->win[bc % 512];
		*p = (clust & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));
		break;

	case FS_FAT16 :
		if (!prvMoveWindow(fatsect + clust / 256)) return FALSE;
		ST_WORD(&(fs->win[((WORD)clust * 2) % 512]), (WORD)val);
		break;

	case FS_FAT32 :
		if (!prvMoveWindow(fatsect + clust / 128)) return FALSE;
		ST_DWORD(&(fs->win[((WORD)clust * 4) % 512]), val);
		break;

	default :
		return FALSE;
	}
	fs->winflag = 1;
	return TRUE;
}
#endif /* _FS_READONLY */



/*------------------------*/
/* Remove a Cluster Chain */

#ifndef _FS_READONLY
static
BOOL prvRemoveChain (
	DWORD clust			/* Cluster# to remove chain from */
)
{
	DWORD nxt;


	if (clust) {
		while ((nxt = prvGetCluster(clust)) >= 2) {
			if (!prvPutCluster(clust, 0)) return FALSE;
			clust = nxt;
		}
	}
	return TRUE;
}
#endif



/*-----------------------------------*/
/* Stretch or Create a Cluster Chain */

#ifndef _FS_READONLY
static
DWORD prvCreateChain (
	DWORD clust			 /* Cluster# to stretch, 0 means create new */
)
{
	DWORD cstat, ncl, scl, mcl;
	FATFS *fs = FatFs;


	mcl = fs->max_clust;
	if (clust == 0) {		/* Create new chain */
		scl = fs->last_clust;			/* Get last allocated cluster */
		if (scl < 2 || scl >= mcl) scl = 1;
	}
	else {					/* Stretch existing chain */
		cstat = prvGetCluster(clust);		/* Check the cluster status */
		if (cstat < 2) return 0;		/* It is an invalid cluster */
		if (cstat < mcl) return cstat;	/* It is already followed by next cluster */
		scl = clust;
	}
	ncl = scl;				/* Scan start cluster */
	do {
		ncl++;						/* Next cluster */
		if (ncl >= mcl) {			/* Wrap around */
			ncl = 2;
			if (scl == 1) return 0;	/* No free custer was found */
		}
		if (ncl == scl) return 0;	/* No free custer was found */
		cstat = prvGetCluster(ncl);	/* Get the cluster status */
		if (cstat == 1) return 0;	/* Any error occured */
	} while (cstat);				/* Repeat until find a free cluster */

	if (!prvPutCluster(ncl, 0x0FFFFFFF)) return 0;		/* Mark the new cluster "in use" */
	if (clust && !prvPutCluster(clust, ncl)) return 0;	/* Link it to previous one if needed */
	fs->last_clust = ncl;

	return ncl;		/* Return new cluster number */
}
#endif /* _FS_READONLY */



/*----------------------------*/
/* Get Sector# from Cluster#  */

static
DWORD prvClust2Sect (
	DWORD clust		/* Cluster# to be converted */
)
{
	FATFS *fs = FatFs;


	clust -= 2;
	if (clust >= fs->max_clust) return 0;		/* Invalid cluster# */
	return clust * fs->sects_clust + fs->database;
}



/*------------------------*/
/* Check File System Type */

static
BYTE prvCheckFS (
	DWORD sect		/* Sector# to check if it is a FAT boot record or not */
)
{
	static const char fatsign[] = "FAT12FAT16FAT32";
	FATFS *fs = FatFs;

	/* Determines FAT type by signature string but this is not correct.
	   For further information, refer to fatgen103.doc from Microsoft. */
	memset(fs->win, 0, 512);
	if (wDiskRead(fs->win, sect, 1) == RES_OK) {	/* Load boot record */
		if (LD_WORD(&(fs->win[510])) == 0xAA55) {		/* Is it valid? */
			if (!memcmp(&(fs->win[0x36]), &fatsign[0], 5))
				return FS_FAT12;
			if (!memcmp(&(fs->win[0x36]), &fatsign[5], 5))
				return FS_FAT16;
			if (!memcmp(&(fs->win[0x52]), &fatsign[10], 5) && (fs->win[0x28] == 0))
				return FS_FAT32;
		}
	}
	return 0;
}



/*--------------------------------*/
/* Move Directory Pointer to Next */

static
BOOL prvNextDirEntry (
	DIR *scan			/* Pointer to directory object */
)
{
	DWORD clust;
	WORD idx;
	FATFS *fs = FatFs;


	idx = scan->index + 1;
	if ((idx & 15) == 0) {		/* Table sector changed? */
		scan->sect++;			/* Next sector */
		if (!scan->clust) {		/* In static table */
			if (idx >= fs->n_rootdir) return FALSE;	/* Reached to end of table */
		} else {				/* In dynamic table */
			if (((idx / 16) & (fs->sects_clust - 1)) == 0) {	/* Cluster changed? */
				clust = prvGetCluster(scan->clust);		/* Get next cluster */
				if ((clust >= fs->max_clust) || (clust < 2))	/* Reached to end of table */
					return FALSE;
				scan->clust = clust;				/* Initialize for new cluster */
				scan->sect = prvClust2Sect(clust);
			}
		}
	}
	scan->index = idx;	/* Lower 4 bit of scan->index indicates offset in scan->sect */
	return TRUE;
}



/*--------------------------------------*/
/* Get File Status from Directory Entry */

#if _FS_MINIMIZE <= 1
static
void prvGetFileinfo (
	FILINFO *finfo, 	/* Ptr to store the file information */
	const BYTE *dir		/* Ptr to the directory entry */
)
{
	BYTE n, c, a;
	char *p;


	p = &(finfo->fname[0]);
	a = *(dir+12);	/* NT flag */
	for (n = 0; n < 8; n++) {	/* Convert file name (body) */
		c = *(dir+n);
		if (c == ' ') break;
		if (c == 0x05) c = 0xE5;
		if ((a & 0x08) && (c >= 'A') && (c <= 'Z')) c += 0x20;
		*p++ = c;
	}
	if (*(dir+8) != ' ') {		/* Convert file name (extension) */
		*p++ = '.';
		for (n = 8; n < 11; n++) {
			c = *(dir+n);
			if (c == ' ') break;
			if ((a & 0x10) && (c >= 'A') && (c <= 'Z')) c += 0x20;
			*p++ = c;
		}
	}
	*p = '\0';

	finfo->fattrib = *(dir+11);			/* Attribute */
	finfo->fsize = LD_DWORD(dir+28);	/* Size */
	finfo->fdate = LD_WORD(dir+24);		/* Date */
	finfo->ftime = LD_WORD(dir+22);		/* Time */
}
#endif /* _FS_MINIMIZE <= 1 */
/*--------------------------------------*/
/* Get File Long File Name Entry from Directory Entry */
static
void prvGetLFN (
	FILINFO *finfo, 	/* Ptr to store the file information */
	const BYTE *dir		/* Ptr to the directory entry */
)
{
	//BYTE n, c, a;
	char *p;

        BYTE seq = *(dir);
        BYTE end = 0;
        if (seq & 0x40) end = 1;
        seq &= 0x0F;
        seq--;
	p = &(finfo->flfn[seq*13]);
	
        *p++ = *(dir+1);
        *p++ = *(dir+3);
        *p++ = *(dir+5);
        *p++ = *(dir+7);
        *p++ = *(dir+9);

        *p++ = *(dir+14);
        *p++ = *(dir+16);
        *p++ = *(dir+18);
        *p++ = *(dir+20);
        *p++ = *(dir+22);
        *p++ = *(dir+24);

        *p++ = *(dir+28);
        *p++ = *(dir+30);
        if (end) *p++ = 0;
   
}

/*-------------------------------------------------------------------*/
/* Pick a Paragraph and Create the Name in Format of Directory Entry */

static
char prvMakeDirFile (
	const char **path,		/* Pointer to the file path pointer */
	char *dirname			/* Pointer to directory name buffer {Name(8), Ext(3), NT flag(1)} */
)
{
	BYTE n, t, c, a, b;


	memset(dirname, ' ', 8+3);	/* Fill buffer with spaces */
	a = 0; b = 0x18;	/* NT flag */
	n = 0; t = 8;
	for (;;) {
		c = *(*path)++;
		if (c <= ' ') c = 0;
		if ((c == 0) || (c == '/')) {			/* Reached to end of str or directory separator */
			if (n == 0) break;
			dirname[11] = a & b; return c;
		}
		if (c == '.') {
			if(!(a & 1) && (n >= 1) && (n <= 8)) {	/* Enter extension part */
				n = 8; t = 11; continue;
			}
			break;
		}
#ifdef _USE_SJIS
		if (((c >= 0x81) && (c <= 0x9F)) ||		/* Accept S-JIS code */
		    ((c >= 0xE0) && (c <= 0xFC))) {
			if ((n == 0) && (c == 0xE5))		/* Change heading \xE5 to \x05 */
				c = 0x05;
			a ^= 1; goto md_l2;
		}
		if ((c >= 0x7F) && (c <= 0x80)) break;	/* Reject \x7F \x80 */
#else
		if (c >= 0x7F) goto md_l1;				/* Accept \x7F-0xFF */
#endif
		if (c == '"') break;					/* Reject " */
		if (c <= ')') goto md_l1;				/* Accept ! # $ % & ' ( ) */
		if (c <= ',') break;					/* Reject * + , */
		if (c <= '9') goto md_l1;				/* Accept - 0-9 */
		if (c <= '?') break;					/* Reject : ; < = > ? */
		if (!(a & 1)) {	/* These checks are not applied to S-JIS 2nd byte */
			if (c == '|') break;				/* Reject | */
			if ((c >= '[') && (c <= ']')) break;/* Reject [ \ ] */
			if ((c >= 'A') && (c <= 'Z'))
				(t == 8) ? (b &= ~0x08) : (b &= ~0x10);
			if ((c >= 'a') && (c <= 'z')) {		/* Convert to upper case */
				c -= 0x20;
				(t == 8) ? (a |= 0x08) : (a |= 0x10);
			}
		}
	md_l1:
		a &= ~1;
	md_l2:
		if (n >= t) break;