mirror of
https://github.com/ShadauxCat/CATSFC.git
synced 2025-04-02 10:41:47 -04:00
47 lines
1.1 KiB
C
Executable file
47 lines
1.1 KiB
C
Executable file
#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <ctype.h>
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#include <unistd.h>
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#include <stdio.h>
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#include <iorpg.h>
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#include "cache.h"
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#include "file_allocation_table.h"
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#include "bit_ops.h"
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#include "filetime.h"
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#include "fatfile.h"
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// origin fread/fwrite do not take advantage of continuous read/write function of SD/NAND,
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// it looks like the third parameter to _FAT_read_r()/_FAT_write_r() is a fixed '2'
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// so they are much slower than these two....
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// due to behavior of _FAT_read_r()/_FAT_write_r(),
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// FAT should have a at least 8192 cluster size to get better performance,
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// 16K or larger cluster size can get the best performance.
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int freadex( void * buffer, int _size, int _n, FILE * f )
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{
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if( 0 == _n )
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return 0;
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dbg_printf("freadx %d\n", _n );
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struct _reent r;
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int ret = _FAT_read_r( &r, (int)f->_file + 8, buffer, _size * _n );
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errno = r._errno;
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return ret;
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}
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int fwriteex( const void * buffer, int _size, int _n, FILE * f )
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{
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if( 0 == _n )
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return 0;
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dbg_printf("fwritex new %d\n", _n );
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struct _reent r;
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int ret = _FAT_write_r( &r, (int)f->_file + 8, buffer, _size * _n );
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errno = r._errno;
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return ret;
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}
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