/*
?*?Fast?function?for?libmpsse.
?*?For?use?only?with?SPI?modes.
?*
?*?Paolo?Zambotti
?*?20?March?2013
?*/

#include?
#include?“mpsse.h“
#include?“support.h“

/*?Builds?a?block?buffer?for?the?Fast*?functions.?For?internal?use?only.?*/
int?fast_build_block_buffer（struct?mpsse_context?*mpsse?uint8_t?cmd?unsigned?char?*data?int?size?int?*buf_size）
{
???????	int?i?=?0;
?	uint16_t?rsize?=?0;

	*buf_size?=?0;

	/*?The?reported?size?of?this?block?is?block?size?-?1?*/
	rsize?=?size?-?1;

	/*?Copy?in?the?command?for?this?block?*/
	fast_rw_buf[i++]?=?cmd;
	fast_rw_buf[i++]?=?（rsize?&?0xFF）;
	fast_rw_buf[i++]?=?（（rsize?>>?8）?&?0xFF）;

	/*?On?a?write?copy?the?data?to?transmit?after?the?command?*/
	if（（cmd?==?mpsse->tx?||?cmd?==?mpsse->txrx）?&&?（i?+?size）?<=?sizeof（fast_rw_buf））
	{
		memcpy（fast_rw_buf+i?data?size）;

		/*?i?==?offset?into?buf?*/
		i?+=?size;
	}

	*buf_size?=?i;

	return?MPSSE_OK;
}

/*
?*?Function?for?performing?fast?writes?in?MPSSE.
?*
?*?@mpsse?-?libmpsse?context?pointer.
?*?@data??-?The?data?to?write.
?*?@size??-?The?number?of?bytes?to?write.
?*
?*?Returns?MPSSE_OK?on?success?MPSSE_FAIL?on?failure.
?*/
int?FastWrite（struct?mpsse_context?*mpsse?char?*data?int?size）
{
	int?buf_size?=?0?txsize?=?0?n?=?0;

	if（is_valid_context（mpsse））
	{
		if（mpsse->mode）
		{
			while（n?			{
				txsize?=?size?-?n;
				if（txsize?>?mpsse->xsize）
				{
					txsize?=?mpsse->xsize;
				}
	
				if（fast_build_block_buffer（mpsse?mpsse->tx?（unsigned?char?*）?（data?+?n）?txsize?&buf_size）?==?MPSSE_OK）
				{	
					if（raw_write（mpsse?fast_rw_buf?buf_size）?==?MPSSE_OK）
					{
						n?+=?txsize;
					}
					else
					{
						return?MPSSE_FAIL;
						break;
					}
				}
				else
				{
					return?MPSSE_FAIL;
					break;
				}
			}

			if（n?==?size）
			{
				return?MPSSE_OK;
			}
		}
	}
		
	return?MPSSE_FAIL;
}

/*
?*?Function?for?performing?fast?reads?in?MPSSE.
?*
?*?@mpsse?-?libmpsse?context?pointer.
?*?@data??-?The?destination?buffer?to?read?data?into.
?*?@size??-?The?number?of?bytes?to?read.
?*
?*?Returns?MPSSE_OK?on?success?MPSSE_FAIL?on?failure.
?*/
int?FastRead（struct?mpsse_context?*mpsse?char?*data?int?size）
{
	int?n?=?0?rxsize?=?0?data_size?=?0;

	if（is_valid_context（mpsse））
	{
		if（mpsse->mode）
		{
			while（n?			{
				rxsize?=?size?-?n;
				if（rxsize?>?mpsse->xsize）
				{
					rxsize?=?mpsse->xsize;
				}

				if（fast_build_block_buffer（mpsse?mpsse->rx?NULL?rxsize?&data_size）?==?MPSSE_OK）
				{
					if（raw_write（mpsse?fast_rw_buf?data_size）?==?MPSSE_OK）
					{
						n?+=?raw_read（mpsse?（unsigned?char?*）（data+n）?rxsize）;
					}
					else
					{
						return?MPSSE_FAIL;
						break;
					}
				}
				else
				{
					return?MPSSE_FAIL;
					break;
				}
			}

			if（n?==?size）
			{
				return?MPSSE_OK;
			}
		}
	}
	
	return?MPSSE_FAIL;
}

/*?
?*?Function?to?perform?fast?transfers?in?MPSSE.
?*
?*?@mpsse?-?libmpsse?context?pointer.
?*?@wdata?-?The?data?to?write.
?*?@rdata?-?The?destination?buffer?to?read?data?into.
?*