netbuf.c

Atheros Communications AR6001 WLAN Driver for SDIO installation Read Me March 26,2007 (based on

//------------------------------------------------------------------------------
// <copyright file="netbuf.c" company="Atheros and Microsoft">
//    Copyright (c) 2006 Microsoft Corporation.  All rights reserved.
//    Copyright (c) 2006 Atheros Corporation.  All rights reserved.
//
//    The use and distribution terms for this software are covered by the
//    Microsoft Limited Permissive License (Ms-LPL) 
//    http://www.microsoft.com/resources/sharedsource/licensingbasics/limitedpermissivelicense.mspx 
//    which can be found in the file MS-LPL.txt at the root of this distribution.
//    By using this software in any fashion, you are agreeing to be bound by
//    the terms of this license.
//
//    You must not remove this notice, or any other, from this software.
// </copyright>
// 
// <summary>
//    Windows CE Wifi Driver for AR-6000
// </summary>
//------------------------------------------------------------------------------
//==============================================================================
// Net Buffer utility function library
//
// Author(s): ="Atheros and Microsoft"
//==============================================================================

#include <ndis.h>
#include "wmi_api.h"
#include "bmi.h"
#include "netbuf.h"
#include "ndisnetbuf.h"

void *
a_netbuf_alloc (A_UINT32 len)
{
	void            *buff = NULL;
	ndis_mini_buf_t *pb = NULL;

	buff = A_MALLOC(len+AR6000_DATA_OFFSET);
	if (buff == NULL) {
		return NULL;
	}
	pb = A_MALLOC(sizeof(ndis_mini_buf_t));
	if (pb == NULL) {
		A_FREE(buff);
		return NULL;
	}

	memset(pb, 0, sizeof(ndis_mini_buf_t));
	pb->buf = buff;
	pb->buf_len = len + AR6000_DATA_OFFSET;
	// Reserve headroom
	pb->buf_dat = pb->buf + AR6000_DATA_OFFSET;
	pb->buf_dat_len = 0;
	return pb;
}

void
a_netbuf_put(void *osbuf, A_UINT32 len)
{
	ndis_mini_buf_t *pb = osbuf;

	pb->buf_dat_len += len;
	if((pb->buf_dat + pb->buf_dat_len) > (pb->buf + pb->buf_len)) {
		DEBUGCHK(0);
	}
	return;
}

A_STATUS
a_netbuf_pull(void *osbuf, A_UINT32 len)
{
	ndis_mini_buf_t *pb = osbuf;

	if ((pb->buf_dat_len - len) < 0)
		return A_ERROR;

	pb->buf_dat_len -= len;
	pb->buf_dat += len;

	return A_OK;
}

A_UINT8 *
a_netbuf_to_data(void *osbuf)
{
	ndis_mini_buf_t *pb = osbuf;
	return pb->buf_dat;
}

A_UINT32
a_netbuf_to_len (void *osbuf)
{
	ndis_mini_buf_t *pb = osbuf;

	return pb->buf_dat_len;
}

A_STATUS
a_netbuf_push(void *osbuf, A_UINT32 len)
{
	ndis_mini_buf_t *pb = osbuf;

	if( pb->buf_dat < pb->buf) {
		return A_ERROR;
	}
	pb->buf_dat -= len;
	pb->buf_dat_len += len;

	return A_OK;
}

void
a_netbuf_free(void *osbuf)
{
	ndis_mini_buf_t *pb = osbuf;

	A_FREE(pb->buf);
	A_FREE(pb);
}

A_UINT32
a_netbuf_headroom(void *osbuf)
{
	ndis_mini_buf_t *pb = osbuf;

	if (pb == NULL) {
		return 0;
	}
	return (pb->buf_dat - pb->buf);
}

void
a_netbuf_reset(void *osbuf)
{
	ndis_mini_buf_t *pb = osbuf;

	pb->buf_dat = pb->buf + AR6000_DATA_OFFSET;
	pb->buf_dat_len = 0;

    return;
}