/*
* FreeRTOS+FAT SL V1.0.1 (C) 2014 HCC Embedded
*
* The FreeRTOS+FAT SL license terms are different to the FreeRTOS license
* terms.
*
* FreeRTOS+FAT SL uses a dual license model that allows the software to be used
* under a standard GPL open source license, or a commercial license. The
* standard GPL license (unlike the modified GPL license under which FreeRTOS
* itself is distributed) requires that all software statically linked with
* FreeRTOS+FAT SL is also distributed under the same GPL V2 license terms.
* Details of both license options follow:
*
* - Open source licensing -
* FreeRTOS+FAT SL is a free download and may be used, modified, evaluated and
* distributed without charge provided the user adheres to version two of the
* GNU General Public License (GPL) and does not remove the copyright notice or
* this text. The GPL V2 text is available on the gnu.org web site, and on the
* following URL: http://www.FreeRTOS.org/gpl-2.0.txt.
*
* - Commercial licensing -
* Businesses and individuals who for commercial or other reasons cannot comply
* with the terms of the GPL V2 license must obtain a commercial license before
* incorporating FreeRTOS+FAT SL into proprietary software for distribution in
* any form. Commercial licenses can be purchased from
* http://shop.freertos.org/fat_sl and do not require any source files to be
* changed.
*
* FreeRTOS+FAT SL is distributed in the hope that it will be useful. You
* cannot use FreeRTOS+FAT SL unless you agree that you use the software 'as
* is'. FreeRTOS+FAT SL is provided WITHOUT ANY WARRANTY; without even the
* implied warranties of NON-INFRINGEMENT, MERCHANTABILITY or FITNESS FOR A
* PARTICULAR PURPOSE. Real Time Engineers Ltd. and HCC Embedded disclaims all
* conditions and terms, be they implied, expressed, or statutory.
*
* http://www.FreeRTOS.org
* http://www.FreeRTOS.org/FreeRTOS-Plus
*
*/
#include "../../api/fat_sl.h"
#include "../../psp/include/psp_string.h"
#include "util.h"
#include "volume.h"
#include "drv.h"
#include "fat.h"
#include "dir.h"
#include "file.h"
#include "../../version/ver_fat_sl.h"
#if VER_FAT_SL_MAJOR != 5 || VER_FAT_SL_MINOR != 2
#error Incompatible FAT_SL version number!
#endif
static unsigned char _f_stepnextsector ( void );
/****************************************************************************
*
* fn_filelength
*
* Get a file length
*
* INPUTS
*
* filename - file whose length is needed
*
* RETURNS
*
* length of the file
*
***************************************************************************/
long fn_filelength ( const char * filename )
{
F_POS pos;
F_DIRENTRY * de;
F_NAME fsname;
if ( _f_setfsname( filename, &fsname ) )
{
return 0; /*invalid name*/
}
if ( _f_checknamewc( fsname.filename, fsname.fileext ) )
{
return 0; /*invalid name*/
}
if ( _f_getvolume() )
{
return 0; /*can't get the size*/
}
if ( !_f_findpath( &fsname, &pos ) )
{
return 0;
}
if ( !_f_findfilewc( fsname.filename, fsname.fileext, &pos, &de, 0 ) )
{
return 0;
}
if ( de->attr & F_ATTR_DIR )
{
return 0; /*directory*/
}
return (long)_f_getlong( &de->filesize );
} /* fn_filelength */
/****************************************************************************
*
* _f_emptywritebuffer
*
* empty write buffer if it contains unwritten data
*
* RETURNS
* error code or zero if successful
*
***************************************************************************/
static unsigned char _f_stepnextsector ( void )
{
unsigned char ret;
unsigned char b_alloc;
b_alloc = 0;
gl_volume.fatsector = (unsigned long)-1;
if ( gl_file.startcluster == 0 )
{
b_alloc = 1;
}
else
{
++gl_file.pos.sector;
if ( gl_file.pos.sector >= gl_file.pos.sectorend )
{
unsigned long value;
ret = _f_getclustervalue( gl_file.pos.cluster, &value );
if ( ret )
{
return ret;
}
if ( ( value >= 2 ) && ( value < F_CLUSTER_RESERVED ) ) /*we are in chain*/
{
_f_clustertopos( value, &gl_file.pos ); /*go to next cluster*/
}
else
{
b_alloc = 1;
}
}
}
if ( b_alloc != 0 )
{
unsigned long nextcluster;
ret = _f_alloccluster( &nextcluster );
if ( ret )
{
return ret;
}
ret = _f_setclustervalue( nextcluster, F_CLUSTER_LAST );
if ( ret )
{
return ret;
}
if ( gl_file.startcluster == 0 )
{
gl_file.startcluster = nextcluster;
}
else
{
ret = _f_setclustervalue( gl_file.pos.cluster, nextcluster );
if ( ret )
{
return ret;
}
}
_f_clustertopos( nextcluster, &gl_file.pos );
return _f_writefatsector();
}
return F_NO_ERROR;
} /* _f_stepnextsector */
/****************************************************************************
*
* _f_extend
*
* Extend file to a certain size
*
***************************************************************************/
static unsigned char _f_extend ( long size )
{
unsigned long _size;
unsigned char rc;
size -= gl_file.filesize;
_size = (unsigned long)size;
if ( gl_file.startcluster == 0 )
{
if ( _f_stepnextsector() )
{
return F_ERR_WRITE;
}
}
else
{
if ( ( gl_file.relpos > 0 ) && ( gl_file.relpos < F_SECTOR_SIZE ) )
{
rc = _f_getcurrsector();
if ( rc )
{
return rc;
}
}
}
if ( gl_file.relpos + _size >= F_SECTOR_SIZE )
{
if ( gl_file.relpos < F_SECTOR_SIZE )
{
psp_memset( gl_sector + gl_file.relpos, 0, ( F_SECTOR_SIZE - gl_file.relpos ) );
_size -= ( F_SECTOR_SIZE - gl_file.relpos );
if ( _f_writeglsector( gl_file.pos.sector ) )
{
return F_ERR_WRITE;
}
}
if ( _f_stepnextsector() )
{
return F_ERR_WRITE;
}
psp_memset( gl_sector, 0, F_SECTOR_SIZE );
while ( _size >= F_SECTOR_SIZE )
{
if ( _f_writeglsector( gl_file.pos.sector ) )
{
return F_ERR_WRITE;
}
if ( _f_stepnextsector() )
{
return F_ERR_WRITE;
}
psp_memset( gl_sector, 0, F_SECTOR_SIZE );
_size -= F_SECTOR_SIZE;
}
}
else
{
psp_memset( gl_sector + gl_file.relpos, 0, ( F_SECTOR_SIZE - gl_file.relpos ) );
_size += gl_file.relpos;
}
gl_file.modified = 1;
gl_file.filesize += size;
gl_file.abspos = gl_file.filesize & ( ~( F_SECTOR_SIZE - 1 ) );
gl_file.relpos = _size;
return F_NO_ERROR;
} /* _f_extend */
/****************************************************************************
*
* _f_fseek
*
* subfunction for f_seek it moves position into given offset and read
* the current sector
*
* INPUTS
* offset - position from start
*
* RETURNS
*
* error code or zero if successful
*
***************************************************************************/
static unsigned char _f_fseek ( long offset )
{
unsigned long cluster;
unsigned long tmp;
unsigned char ret = F_NO_ERROR;
long remain;
if ( offset < 0 )
{
offset = 0;
}
if ( ( (unsigned long) offset <= gl_file.filesize )
&& ( (unsigned long) offset >= gl_file.abspos )
&& ( (unsigned long) offset < gl_file.abspos + F_SECTOR_SIZE ) )
{
gl_file.relpos = (unsigned short)( offset - gl_file.abspos );
}
else
{
if ( gl_file.modified )
{
ret = _f_writeglsector( (unsigned long)-1 );
if ( ret )
{
gl_file.mode = F_FILE_CLOSE; /*cant accessed any more*/
return ret;
}
}
if ( gl_file.startcluster )
{
gl_file.abspos = 0;
gl_file.relpos = 0;
gl_file.pos.cluster = gl_file.startcluster;
remain = gl_file.filesize;
tmp = gl_volume.bootrecord.sector_per_cluster;
tmp *= F_SECTOR_SIZE; /* set to cluster size */
/*calc cluster*/
gl_volume.fatsector = (unsigned long)-1;
while ( (unsigned long)offset >= tmp )
{
ret = _f_getclustervalue( gl_file.pos.cluster, &cluster );
if ( ret )
{
gl_file.mode = F_FILE_CLOSE;
return ret;
}
if ( (long) tmp >= remain )
{
break;
}
remain -= tmp;
offset -= tmp;
gl_file.abspos += tmp;
if ( cluster >= F_CLUSTER_RESERVED )
{
break;
}
gl_file.pos.cluster = cluster;
}
_f_clustertopos( gl_file.pos.cluster, &gl_file.pos );
if ( remain && offset )
{
while ( ( offset > (long) F_SECTOR_SIZE )
&& ( remain > (long) F_SECTOR_SIZE ) )
{
gl_file.pos.sector++;
offset -= F_SECTOR_SIZE;
remain -= F_SECTOR_SIZE;
gl_file.abspos += F_SECTOR_SIZE;
}
}
if ( remain < offset )
{
gl_file.relpos = (unsigned short)remain;
ret = _f_extend( gl_file.filesize + offset - remain );
}
else
{
gl_file.relpos = (unsigned short)offset;
}
}
else
{
ret = _f_extend( offset );
}
}
return ret;
} /* _f_fseek */
/****************************************************************************
*
* fn_open
*
* open a file for reading/writing/appending
*
* INPUTS
*
* filename - which file need to be opened
* mode - string how to open ("r"-read, "w"-write, "w+"-overwrite, "a"-append
*
* RETURNS
*
* F_FILE pointer if successfully
* 0 - if any error
*
***************************************************************************/
F_FILE * fn_open ( const char * filename, const char * mode )
{
F_DIRENTRY * de;
F_NAME fsname;
unsigned short date;
unsigned short time;
unsigned char m_mode = F_FILE_CLOSE;
if ( mode[1] == 0 )
{
if ( mode[0] == 'r' )
{
m_mode = F_FILE_RD;
}
if ( mode[0] == 'w' )
{
m_mode = F_FILE_WR;
}
if ( mode[0] == 'a' )
{
m_mode = F_FILE_A;
}
}
if ( ( mode[1] == '+' ) && ( mode[2] == 0 ) )
{
if ( mode[0] == 'r' )
{
m_mode = F_FILE_RDP;
}
if ( mode[0] == 'w' )
{
m_mode = F_FILE_WRP;
}
if ( mode[0] == 'a' )
{
m_mode = F_FILE_AP;
}
}
if ( m_mode == F_FILE_CLOSE )
{
return 0; /*invalid mode*/
}
if ( _f_setfsname( filename, &fsname ) )
{
return 0; /*invalid name*/
}
if ( _f_checknamewc( fsname.filename, fsname.fileext ) )
{
return 0; /*invalid name*/
}
if ( fsname.filename[0] == '.' )
{
return 0;
}
if ( _f_getvolume() )
{
return 0; /*cant open any*/
}
if ( gl_file.mode != F_FILE_CLOSE )
{
return 0;
}
psp_memset( &gl_file, 0, sizeof( F_FILE ) );
if ( !_f_findpath( &fsname, &gl_file.dirpos ) )
{
return 0;
}
switch ( m_mode )
{
case F_FILE_RDP: /*r*/
case F_FILE_RD: /*r*/
if ( !_f_findfilewc( fsname.filename, fsname.fileext, &gl_file.dirpos, &de, 0 ) )
{
return 0;
}
if ( de->attr & F_ATTR_DIR )
{
return 0; /*directory*/
}
gl_file.startcluster = _f_getdecluster( de );
if ( gl_file.startcluster )
{
_f_clustertopos( gl_file.startcluster, &gl_file.pos );
gl_file.filesize = _f_getlong( &de->filesize );
gl_file.abspos = (unsigned long) (-1 * (long) F_SECTOR_SIZE);
if ( _f_fseek( 0 ) )
{
return 0;
}
}
#if F_FILE_CHANGED_EVENT
if ( m_mode == F_FILE_RDP )
{
_f_createfullname( gl_file.filename, sizeof( gl_file.filename ), fsname.path, fsname.filename, fsname.fileext );
}
#endif
break;
case F_FILE_AP:
case F_FILE_A: /*a*/
psp_memcpy( &( gl_file.pos ), &( gl_file.dirpos ), sizeof( F_POS ) );
if ( _f_findfilewc( fsname.filename, fsname.fileext, &gl_file.dirpos, &de, 0 ) )
{
if ( de->attr & ( F_ATTR_DIR | F_ATTR_READONLY ) )
{
return 0;
}
gl_file.startcluster = _f_getdecluster( de );
gl_file.filesize = _f_getlong( &de->filesize );
if ( gl_file.startcluster )
{
_f_clustertopos( gl_file.startcluster, &gl_file.pos );
gl_file.abspos = (unsigned long) (-1 * (long) F_SECTOR_SIZE); /*forcing seek to read 1st sector! abspos=0;*/
if ( _f_fseek( (long)gl_file.filesize ) )
{
gl_file.mode = F_FILE_CLOSE;
return 0;
}
}
}
else
{
psp_memcpy( &( gl_file.dirpos ), &( gl_file.pos ), sizeof( F_POS ) );
_f_clustertopos( gl_file.dirpos.cluster, &gl_file.pos );
if ( _f_addentry( &fsname, &gl_file.dirpos, &de ) )
{
return 0; /*couldnt be added*/
}
de->attr |= F_ATTR_ARC; /*set as archiv*/
if ( _f_writeglsector( (unsigned long)-1 ) )
{
return 0;
}
}
#if F_FILE_CHANGED_EVENT
_f_createfullname( gl_file.filename, sizeof( gl_file.filename ), fsname.path, fsname.filename, fsname.fileext );
#endif
break;
case F_FILE_WR: /*w*/
case F_FILE_WRP: /*w+*/
_f_clustertopos( gl_file.dirpos.cluster, &gl_file.pos );
if ( _f_findfilewc( fsname.filename, fsname.fileext, &gl_file.pos, &de, 0 ) )
{
unsigned long cluster = _f_getdecluster( de ); /*exist*/
if ( de->attr & ( F_ATTR_DIR | F_ATTR_READONLY ) )
{
return 0;
}
psp_memcpy( &( gl_file.dirpos ), &( gl_file.pos ), sizeof( F_POS ) );
_f_setlong( de->filesize, 0 ); /*reset size;*/
de->attr |= F_ATTR_ARC; /*set as archiv*/
_f_setword( de->clusterlo, 0 ); /*no points anywhere*/
_f_setword( de->clusterhi, 0 );
if ( gl_volume.mediatype == F_FAT32_MEDIA )
{
f_igettimedate( &time, &date );
_f_setword( &de->crtdate, date ); /*if there is realtime clock then creation date could be set from*/
_f_setword( &de->crttime, time ); /*if there is realtime clock then creation time could be set from*/
_f_setword( &de->lastaccessdate, date ); /*if there is realtime clock then creation date could be set from*/
}
if ( _f_writeglsector( (unsigned long)-1 ) )
{
return 0;
}
if ( _f_removechain( cluster ) )
{
return 0; /*remove */
}
}
else
{
if ( _f_addentry( &fsname, &gl_file.dirpos, &de ) )
{
return 0; /*couldnt be added*/
}
psp_memset( &gl_file, 0, 21 );
de->attr |= F_ATTR_ARC; /*set as archiv*/
if ( _f_writeglsector( (unsigned long)-1 ) )
{
return 0;
}
}
#if F_FILE_CHANGED_EVENT
_f_createfullname( gl_file.filename, sizeof( gl_file.filename ), fsname.path, fsname.filename, fsname.fileext );
#endif
break;
default:
return 0; /*invalid mode*/
} /* switch */
gl_file.mode = m_mode; /* lock it */
return (F_FILE *)1;
} /* fn_open */
/****************************************************************************
* _f_updatefileentry
* Updated a file directory entry or removes the entry
* and the fat chain belonging to it.
***************************************************************************/
static unsigned char _f_updatefileentry ( int remove )
{
F_DIRENTRY * de;
unsigned short date;
unsigned short time;
de = (F_DIRENTRY *)( gl_sector + sizeof( F_DIRENTRY ) * gl_file.dirpos.pos );
if ( _f_readglsector( gl_file.dirpos.sector ) || remove )
{
_f_setdecluster( de, 0 );
_f_setlong( &de->filesize, 0 );
(void)_f_writeglsector( (unsigned long)-1 );
(void)_f_removechain( gl_file.startcluster );
return F_ERR_WRITE;
}
_f_setdecluster( de, gl_file.startcluster );
_f_setlong( &de->filesize, gl_file.filesize );
f_igettimedate( &time, &date );
_f_setword( &de->cdate, date ); /*if there is realtime clock then creation date could be set from*/
_f_setword( &de->ctime, time ); /*if there is realtime clock then creation time could be set from*/
if ( gl_volume.mediatype == F_FAT32_MEDIA )
{
_f_setword( &de->lastaccessdate, date ); /*if there is realtime clock then creation date could be set from*/
}
return _f_writeglsector( (unsigned long)-1 );
} /* _f_updatefileentry */
/****************************************************************************
*
* fn_close
*
* close a previously opened file
*
* INPUTS
*
* filehandle - which file needs to be closed
*
* RETURNS
*
* error code or zero if successful
*
***************************************************************************/
unsigned char fn_close ( F_FILE * f )
{
unsigned char ret;
#if F_FILE_CHANGED_EVENT
unsigned char mode;
#endif
if ( !f )
{
return F_ERR_NOTOPEN;
}
ret = _f_getvolume();
if ( ret )
{
return ret;
}
if ( gl_file.mode == F_FILE_CLOSE )
{
return F_ERR_NOTOPEN;
}
else if ( gl_file.mode == F_FILE_RD )
{
gl_file.mode = F_FILE_CLOSE;
return F_NO_ERROR;
}
else
{
#if F_FILE_CHANGED_EVENT
mode = f->mode;
#endif
gl_file.mode = F_FILE_CLOSE;
if ( gl_file.modified )
{
if ( _f_writeglsector( (unsigned long)-1 ) )
{
(void)_f_updatefileentry( 1 );
return F_ERR_WRITE;
}
}
ret = _f_updatefileentry( 0 );
#if F_FILE_CHANGED_EVENT
if ( f_filechangedevent && !ret )
{
ST_FILE_CHANGED fc;
if ( ( mode == F_FILE_WR ) || ( mode == F_FILE_WRP ) )
{
fc.action = FACTION_ADDED;
fc.flags = FFLAGS_FILE_NAME;
}
else if ( ( mode == F_FILE_A ) || ( mode == F_FILE_RDP ) )
{
fc.action = FACTION_MODIFIED;
fc.flags = FFLAGS_FILE_NAME | FFLAGS_SIZE;
}
strcpy( fc.filename, f->filename );
if ( f->filename[0] )
{
f_filechangedevent( &fc );
}
f->filename[0] = '\0';
}
#endif /* if F_FILE_CHANGED_EVENT */
return ret;
}
} /* fn_close */
/****************************************************************************
*
* fn_flush
*
* flush a previously opened file
*
* INPUTS
*
* filehandle - which file needs to be closed
*
* RETURNS
*
* error code or zero if successful
*
***************************************************************************/
unsigned char fn_flush ( F_FILE * f )
{
unsigned char ret;
if ( !f )
{
return F_ERR_NOTOPEN;
}
ret = _f_getvolume();
if ( ret )
{
return ret;
}
if ( gl_file.mode == F_FILE_CLOSE )
{
return F_ERR_NOTOPEN;
}
else if ( gl_file.mode != F_FILE_RD )
{
if ( gl_file.modified )
{
if ( _f_writeglsector( (unsigned long)-1 ) )
{
(void)_f_updatefileentry( 1 );
return F_ERR_WRITE;
}
}
return _f_updatefileentry( 0 );
}
return F_NO_ERROR;
} /* fn_flush */
/****************************************************************************
*
* fn_read
*
* read data from file
*
* INPUTS
*
* buf - where the store data
* size - size of items to be read
* _size_t - number of items need to be read
* filehandle - file where to read from
*
* RETURNS
*
* with the number of read bytes
*
***************************************************************************/
long fn_read ( void * buf, long size, long _size_st, F_FILE * f )
{
char * buffer = (char *)buf;
long retsize;
if ( !f )
{
return 0;
}
if ( ( gl_file.mode & ( F_FILE_RD | F_FILE_RDP | F_FILE_WRP | F_FILE_AP ) ) == 0 )
{
return 0;
}
retsize = size;
size *= _size_st;
_size_st = retsize;
retsize = 0;
if ( _f_getvolume() )
{
return 0; /*cant read any*/
}
if ( size + gl_file.relpos + gl_file.abspos >= gl_file.filesize ) /*read len longer than the file*/
{
size = (long)( ( gl_file.filesize ) - ( gl_file.relpos ) - ( gl_file.abspos ) ); /*calculate new size*/
}
if ( size <= 0 )
{
return 0;
}
if ( _f_getcurrsector() )
{
gl_file.mode = F_FILE_CLOSE; /*no more read allowed*/
return 0;
}
for( ; ; )
{
unsigned long rdsize = (unsigned long)size;
if ( gl_file.relpos == F_SECTOR_SIZE )
{
unsigned char ret;
gl_file.abspos += gl_file.relpos;
gl_file.relpos = 0;
if ( gl_file.modified )
{
ret = _f_writeglsector( (unsigned long)-1 ); /*empty write buffer */
if ( ret )
{
gl_file.mode = F_FILE_CLOSE; /*no more read allowed*/
return retsize;
}
}
gl_file.pos.sector++; /*goto next*/
ret = _f_getcurrsector();
if ( ( ret == F_ERR_EOF ) && ( !size ) )
{
return retsize;
}
if ( ret )
{
gl_file.mode = F_FILE_CLOSE; /*no more read allowed*/
return retsize;
}
}
if ( !size )
{
break;
}
if ( rdsize >= F_SECTOR_SIZE - gl_file.relpos )
{
rdsize = (unsigned long)( F_SECTOR_SIZE - gl_file.relpos );
}
psp_memcpy( buffer, gl_sector + gl_file.relpos, rdsize ); /*always less than 512*/
buffer += rdsize;
gl_file.relpos += rdsize;
size -= rdsize;
retsize += rdsize;
}
return retsize / _size_st;
} /* fn_read */
/****************************************************************************
*
* fn_write
*
* write data into file
*
* INPUTS
*
* buf - where the store data
* size - size of items to be read
* size_t - number of items need to be read
* filehandle - file where to read from
*
* RETURNS
*
* with the number of read bytes
*
***************************************************************************/
long fn_write ( const void * buf, long size, long _size_st, F_FILE * f )
{
char * buffer = (char *)buf;
long retsize;
long ret = 0;
if ( !f )
{
return 0;
}
if ( ( gl_file.mode & ( F_FILE_WR | F_FILE_A | F_FILE_RDP | F_FILE_WRP | F_FILE_AP ) ) == 0 )
{
return 0;
}
retsize = size;
size *= _size_st;
_size_st = retsize;
retsize = 0;
if ( size == 0 )
{
return 0;
}
if ( _f_getvolume() )
{
return 0; /*can't write*/
}
if ( ( gl_file.mode ) & ( F_FILE_A | F_FILE_AP ) )
{
if ( _f_fseek( (long)gl_file.filesize ) )
{
gl_file.mode = F_FILE_CLOSE;
return 0;
}
}
if ( gl_file.startcluster == 0 )
{
if ( _f_stepnextsector() )
{
gl_file.mode = F_FILE_CLOSE;
return 0;
}
}
else
{
if ( _f_getcurrsector() )
{
gl_file.mode = F_FILE_CLOSE;
return 0;
}
}
for( ; ; )
{
unsigned long wrsize = (unsigned long)size;
if ( gl_file.relpos == F_SECTOR_SIZE )
{ /*now full*/
if ( gl_file.modified )
{
if ( _f_writeglsector( gl_file.pos.sector ) )
{
gl_file.mode = F_FILE_CLOSE;
if ( _f_updatefileentry( 0 ) == 0 )
{
return retsize;
}
else
{
return 0;
}
}
gl_file.modified = 0;
}
if ( _f_stepnextsector() )
{
gl_file.mode = F_FILE_CLOSE;
if ( _f_updatefileentry( 0 ) == 0 )
{
return retsize;
}
else
{
return 0;
}
}
gl_file.abspos += gl_file.relpos;
gl_file.relpos = 0;
if ( wrsize && ( wrsize < F_SECTOR_SIZE ) )
{
ret = _f_getcurrsector();
if ( ret )
{
if ( ret != F_ERR_EOF )
{
gl_file.mode = F_FILE_CLOSE; /*no more read allowed*/
return retsize;
}
}
}
}
if ( !size )
{
break;
}
if ( wrsize >= F_SECTOR_SIZE - gl_file.relpos )
{
wrsize = (unsigned long)( F_SECTOR_SIZE - gl_file.relpos );
}
psp_memcpy( gl_sector + gl_file.relpos, buffer, wrsize );
gl_file.modified = 1; /*sector is modified*/
buffer += wrsize;
gl_file.relpos += wrsize;
size -= wrsize;
retsize += wrsize;
if ( gl_file.filesize < gl_file.abspos + gl_file.relpos )
{
gl_file.filesize = gl_file.abspos + gl_file.relpos;
}
}
return retsize / _size_st;
} /* fn_write */
/****************************************************************************
*
* fn_seek
*
* moves position into given offset in given file
*
* INPUTS
*
* filehandle - F_FILE structure which file position needed to be modified
* offset - relative position
* whence - where to calculate position (F_SEEK_SET,F_SEEK_CUR,F_SEEK_END)
*
* RETURNS
*
* 0 - if successfully
* other - if any error
*
***************************************************************************/
unsigned char fn_seek ( F_FILE * f, long offset, unsigned char whence )
{
unsigned char ret;
if ( !f )
{
return F_ERR_NOTOPEN;
}
if ( ( gl_file.mode & ( F_FILE_RD | F_FILE_WR | F_FILE_A | F_FILE_RDP | F_FILE_WRP | F_FILE_AP ) ) == 0 )
{
return F_ERR_NOTOPEN;
}
ret = _f_getvolume();
if ( ret )
{
return ret;
}
if ( whence == F_SEEK_CUR )
{
return _f_fseek( (long)( gl_file.abspos + gl_file.relpos + offset ) );
}
else if ( whence == F_SEEK_END )
{
return _f_fseek( (long)( gl_file.filesize + offset ) );
}
else if ( whence == F_SEEK_SET )
{
return _f_fseek( offset );
}
return F_ERR_NOTUSEABLE;
} /* fn_seek */
/****************************************************************************
*
* fn_tell
*
* Tells the current position of opened file
*
* INPUTS
*
* filehandle - which file needs the position
*
* RETURNS
*
* position in the file from start
*
***************************************************************************/
long fn_tell ( F_FILE * f )
{
if ( !f )
{
return 0;
}
if ( ( gl_file.mode & ( F_FILE_RD | F_FILE_WR | F_FILE_A | F_FILE_RDP | F_FILE_WRP | F_FILE_AP ) ) == 0 )
{
return 0;
}
return (long)( gl_file.abspos + gl_file.relpos );
}
/****************************************************************************
*
* fn_eof
*
* Tells if the current position is end of file or not
*
* INPUTS
*
* filehandle - which file needs the checking
*
* RETURNS
*
* 0 - if not EOF
* other - if EOF or invalid file handle
*
***************************************************************************/
unsigned char fn_eof ( F_FILE * f )
{
if ( !f )
{
return F_ERR_NOTOPEN; /*if error*/
}
if ( gl_file.abspos + gl_file.relpos < gl_file.filesize )
{
return 0;
}
return F_ERR_EOF; /*EOF*/
}
/****************************************************************************
*
* fn_rewind
*
* set the fileposition in the opened file to the begining
*
* INPUTS
*
* filehandle - which file needs to be rewinded
*
* RETURNS
*
* error code or zero if successful
*
***************************************************************************/
unsigned char fn_rewind ( F_FILE * filehandle )
{
return fn_seek( filehandle, 0L, F_SEEK_SET );
}
/****************************************************************************
*
* fn_putc
*
* write a character into file
*
* INPUTS
*
* ch - what to write into file
* filehandle - file where to write
*
* RETURNS
*
* with the number of written bytes (1-success, 0-not successfully)
*
***************************************************************************/
int fn_putc ( int ch, F_FILE * filehandle )
{
unsigned char tmpch = (unsigned char)ch;
if ( fn_write( &tmpch, 1, 1, filehandle ) )
{
return ch;
}
else
{
return -1;
}
}
/****************************************************************************
*
* fn_getc
*
* get a character from file
*
* INPUTS
*
* filehandle - file where to read from
*
* RETURNS
*
* with the read character or -1 if read was not successfully
*
***************************************************************************/
int fn_getc ( F_FILE * filehandle )
{
unsigned char ch;
if ( !fn_read( &ch, 1, 1, filehandle ) )
{
return -1;
}
return (int)ch;
}
/****************************************************************************
*
* fn_delete
*
* delete a file
*
* INPUTS
*
* filename - file which wanted to be deleted (with or without path)
*
* RETURNS
*
* error code or zero if successful
*
***************************************************************************/
unsigned char fn_delete ( const char * filename )
{
F_POS pos;
F_DIRENTRY * de;
F_NAME fsname;
unsigned char ret;
if ( _f_setfsname( filename, &fsname ) )
{
return F_ERR_INVALIDNAME; /*invalid name*/
}
if ( _f_checknamewc( fsname.filename, fsname.fileext ) )
{
return F_ERR_INVALIDNAME; /*invalid name*/
}
if ( fsname.filename[0] == '.' )
{
return F_ERR_NOTFOUND;
}
ret = _f_getvolume();
if ( ret )
{
return ret;
}
if ( !( _f_findpath( &fsname, &pos ) ) )
{
return F_ERR_INVALIDDIR;
}
if ( !_f_findfilewc( fsname.filename, fsname.fileext, &pos, &de, 0 ) )
{
return F_ERR_NOTFOUND;
}
if ( de->attr & F_ATTR_DIR )
{
return F_ERR_INVALIDDIR; /*directory*/
}
if ( de->attr & F_ATTR_READONLY )
{
return F_ERR_ACCESSDENIED; /*readonly*/
}
if ( ( gl_file.mode != F_FILE_CLOSE ) && ( gl_file.dirpos.sector == pos.sector ) && ( gl_file.dirpos.pos == pos.pos ) )
{
return F_ERR_LOCKED;
}
de->name[0] = (unsigned char)0xe5; /*removes it*/
ret = _f_writeglsector( (unsigned long)-1 );
if ( ret )
{
return ret;
}
ret = _f_removechain( _f_getdecluster( de ) );
#if F_FILE_CHANGED_EVENT
if ( f_filechangedevent && !ret )
{
ST_FILE_CHANGED fc;
fc.action = FACTION_REMOVED;
fc.flags = FFLAGS_FILE_NAME;
if ( !_f_createfullname( fc.filename, sizeof( fc.filename ), fsname.path, fsname.filename, fsname.fileext ) )
{
f_filechangedevent( &fc );
}
}
#endif
return ret;
} /* fn_delete */
/****************************************************************************
*
* _f_seteof
*
* Set end of file
*
* INPUT: f - file pointer
* filesize - required new size
* RETURN: F_NO_ERROR - on success
* other if error
*
***************************************************************************/
unsigned char _f_seteof ( F_FILE * f, long filesize )
{
unsigned char rc = F_NO_ERROR;
if ( !f )
{
return F_ERR_NOTOPEN; /*if error*/
}
if ( ( unsigned long) filesize < gl_file.filesize )
{
rc = _f_fseek( filesize );
if ( rc == F_NO_ERROR )
{
unsigned long cluster;
rc = _f_getclustervalue( gl_file.pos.cluster, &cluster );
if ( rc == F_NO_ERROR )
{
if ( cluster != F_CLUSTER_LAST )
{
rc = _f_removechain( cluster );
if ( rc )
{
return rc;
}
rc = _f_setclustervalue( gl_file.pos.cluster, F_CLUSTER_LAST );
if ( rc )
{
return rc;
}
rc = _f_writefatsector();
if ( rc )
{
return rc;
}
}
gl_file.filesize = (unsigned long)filesize;
}
}
}
else if ( (unsigned long) filesize > gl_file.filesize )
{
rc = _f_fseek( filesize );
}
return rc;
} /* _f_seteof */
/****************************************************************************
*
* fn_seteof
*
* Set end of file
*
* INPUT: f - file pointer
* filesize - required new size
* RETURN: F_NO_ERROR - on success
* other if error
*
***************************************************************************/
unsigned char fn_seteof ( F_FILE * f )
{
unsigned char rc = F_NO_ERROR;
rc = _f_seteof( f, ( gl_file.abspos + gl_file.relpos ) );
return rc;
} /* fn_seteof */
/****************************************************************************
*
* fn_truncate
*
* Open a file and set end of file
*
* INPUT: filename - name of the file
* filesize - required new size
* RETURN: NULL on error, otherwise file pointer
*
***************************************************************************/
F_FILE * fn_truncate ( const char * filename, long filesize )
{
F_FILE * f = fn_open( filename, "r+" );
unsigned char rc;
if ( f != NULL )
{
rc = _f_fseek( (long)gl_file.filesize );
if ( rc == F_NO_ERROR )
{
rc = _f_seteof( f, filesize );
}
if ( rc )
{
fn_close( f );
f = NULL;
}
}
return f;
} /* fn_truncate */