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author | Nebuleon Fumika | 2013-02-03 04:19:11 -0500 |
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committer | Nebuleon Fumika | 2013-02-03 04:19:11 -0500 |
commit | 8693ae1bd880a758eb2efec4fccd32f89593855d (patch) | |
tree | 660b7ceed1789fc904332b96a2a4006b0e4cc6b8 /sdk-modifications/libsrc/fs/fatfile_ex.c | |
parent | 02f8184fe07d99cceb85f4abd3ef0e5e3765b5ea (diff) | |
download | snes9x2005-8693ae1bd880a758eb2efec4fccd32f89593855d.tar.gz snes9x2005-8693ae1bd880a758eb2efec4fccd32f89593855d.tar.bz2 snes9x2005-8693ae1bd880a758eb2efec4fccd32f89593855d.zip |
Add SDK modifications by BassAceGold as of 2011-04-14, as well as modified DMA functions as of 2013-01-29.
Diffstat (limited to 'sdk-modifications/libsrc/fs/fatfile_ex.c')
-rw-r--r-- | sdk-modifications/libsrc/fs/fatfile_ex.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/sdk-modifications/libsrc/fs/fatfile_ex.c b/sdk-modifications/libsrc/fs/fatfile_ex.c new file mode 100644 index 0000000..aa23fb3 --- /dev/null +++ b/sdk-modifications/libsrc/fs/fatfile_ex.c @@ -0,0 +1,47 @@ +#include <fcntl.h> +#include <string.h> +#include <errno.h> +#include <ctype.h> +#include <unistd.h> +#include <stdio.h> +#include <iorpg.h> + +#include "cache.h" +#include "file_allocation_table.h" +#include "bit_ops.h" +#include "filetime.h" +#include "fatfile.h"
+ +// origin fread/fwrite do not take advantage of continuous read/write function of SD/NAND, +// it looks like the third parameter to _FAT_read_r()/_FAT_write_r() is a fixed '2' +// so they are much slower than these two.... + +// due to behavior of _FAT_read_r()/_FAT_write_r(), +// FAT should have a at least 8192 cluster size to get better performance, +// 16K or larger cluster size can get the best performance. + + + +int freadex( void * buffer, int _size, int _n, FILE * f ) +{ + if( 0 == _n ) + return 0; + dbg_printf("freadx %d\n", _n ); + struct _reent r; + int ret = _FAT_read_r( &r, (int)f->_file + 8, buffer, _size * _n ); + errno = r._errno; + return ret; +} + + +int fwriteex( const void * buffer, int _size, int _n, FILE * f ) +{ + if( 0 == _n ) + return 0; + dbg_printf("fwritex new %d\n", _n ); + struct _reent r; + int ret = _FAT_write_r( &r, (int)f->_file + 8, buffer, _size * _n ); + errno = r._errno; + return ret; +} + |