/**
 * \file
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 * This file is part of BeRTOS.
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 * Copyright 2009 Develer S.r.l. (http://www.develer.com/)
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 *
 * \brief KFile interface over a FIFO buffer.
 *
 * \author Francesco Sacchi <asterix@develer.com>
 */

#include "kfile_fifo.h"
#include "fifobuf.h"

#include <io/kfile.h>

#include <string.h>

static size_t kfilefifo_read(struct KFile *_fd, void *_buf, size_t size)
{
	KFileFifo *fd = KFILEFIFO_CAST(_fd);
	uint8_t *buf = (uint8_t *)_buf;

	while (size-- && !fifo_isempty_locked(fd->fifo))
		*buf++ = fifo_pop_locked(fd->fifo);

	return buf - (uint8_t *)_buf;
}

static size_t kfilefifo_write(struct KFile *_fd, const void *_buf, size_t size)
{
	KFileFifo *fd = KFILEFIFO_CAST(_fd);
	const uint8_t *buf = (const uint8_t *)_buf;

	while (size-- && !fifo_isfull_locked(fd->fifo))
		fifo_push_locked(fd->fifo, *buf++);

	return buf - (const uint8_t *)_buf;
}

void kfilefifo_init(KFileFifo *kf, FIFOBuffer *fifo)
{
	memset(kf, 0, sizeof(*kf));

	kf->fifo = fifo;
	kf->fd.read = kfilefifo_read;
	kf->fd.write = kfilefifo_write;
	DB(kf->fd._type = KFT_KFILEFIFO);
}