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  *   ˆl–Ü4ý( ©³( 	Å€fàB¦-ÿÄƒq§_†I|¥+ÃÇ <    /* SPDX-License-Identifier: GPL-2.0-only */
/*
 * Copyright (C) ST-Ericsson AB 2010
 * Author:	Sjur Brendeland
 */

#ifndef CFPKT_H_
#define CFPKT_H_
#include <net/caif/caif_layer.h>
#include <linux/types.h>
struct cfpkt;

/* Create a CAIF packet.
 * len: Length of packet to be created
 * @return New packet.
 */
struct cfpkt *cfpkt_create(u16 len);

/*
 * Destroy a CAIF Packet.
 * pkt Packet to be destoyed.
 */
void cfpkt_destroy(struct cfpkt *pkt);

/*
 * Extract header from packet.
 *
 * pkt Packet to extract header data from.
 * data Pointer to copy the header data into.
 * len Length of head data to copy.
 * @return zero on success and error code upon failure
 */
int cfpkt_extr_head(struct cfpkt *pkt, void *data, u16 len);

static inline u8 cfpkt_extr_head_u8(struct cfpkt *pkt)
{
	u8 tmp;

	cfpkt_extr_head(pkt, &tmp, 1);

	return tmp;
}

static inline u16 cfpkt_extr_head_u16(struct cfpkt *pkt)
{
	__le16 tmp;

	cfpkt_extr_head(pkt, &tmp, 2);

	return le16_to_cpu(tmp);
}

static inline u32 cfpkt_extr_head_u32(struct cfpkt *pkt)
{
	__le32 tmp;

	cfpkt_extr_head(pkt, &tmp, 4);

	return le32_to_cpu(tmp);
}

/*
 * Peek header from packet.
 * Reads data from packet without changing packet.
 *
 * pkt Packet to extract header data from.
 * data Pointer to copy the header data into.
 * len Length of head data to copy.
 * @return zero on success and error code upon failure
 */
int cfpkt_peek_head(struct cfpkt *pkt, void *data, u16 len);

/*
 * Extract header from trailer (end of packet).
 *
 * pkt Packet to extract header data from.
 * data Pointer to copy the trailer data into.
 * len Length of header data to copy.
 * @return zero on success and error code upon failure
 */
int cfpkt_extr_trail(struct cfpkt *pkt, void *data, u16 len);

/*
 * Add header to packet.
 *
 *
 * pkt Packet to add header data to.
 * data Pointer to data to copy into the header.
 * len Length of header data to copy.
 * @return zero on success and error code upon failure
 */
int cfpkt_add_head(struct cfpkt *pkt, const void *data, u16 len);

/*
 * Add trailer to packet.
 *
 *
 * pkt Packet to add trailer data to.
 * data Pointer to data to copy into the trailer.
 * len Length of trailer data to copy.
 * @return zero on success and error code upon failure
 */
int cfpkt_add_trail(struct cfpkt *pkt, const void *data, u16 len);

/*
 * Pad trailer on packet.
 * Moves data pointer in packet, no content copied.
 *
 * pkt Packet in which to pad trailer.
 * len Length of padding to add.
 * @return zero on success and error code upon failure
 */
int cfpkt_pad_trail(struct cfpkt *pkt, u16 len);

/*
 * Add a single byte to packet body (tail).
 *
 * pkt Packet in which to add byte.
 * data Byte to add.
 * @return zero on success and error code upon failure
 */
int cfpkt_addbdy(struct cfpkt *pkt, const u8 data);

/*
 * Add a data to packet body (tail).
 *
 * pkt Packet in which to add data.
 * data Pointer to data to copy into the packet body.
 * len Length of data to add.
 * @return zero on success and error code upon failure
 */
int cfpkt_add_body(struct cfpkt *pkt, const void *data, u16 len);

/*
 * Checks whether there are more data to process in packet.
 * pkt Packet to check.
 * @return true if more data are available in packet false otherwise
 */
bool cfpkt_more(struct cfpkt *pkt);

/*
 * Checks whether the packet is erroneous,
 * i.e. if it has been attempted to extract more data than available in packet
 * or writing more data than has been allocated in cfpkt_create().
 * pkt Packet to check.
 * @return true on error false otherwise
 */
bool cfpkt_erroneous(struct cfpkt *pkt);

/*
 * Get the packet length.
 * pkt Packet to get length from.
 * @return Number of bytes in packet.
 */
u16 cfpkt_getlen(struct cfpkt *pkt);

/*
 * Set the packet length, by adjusting the trailer pointer according to length.
 * pkt Packet to set length.
 * len Packet length.
 * @return Number of bytes in packet.
 */
int cfpkt_set