/*
 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 */

#ifndef __LWIP_PBUF_H__
#define __LWIP_PBUF_H__

#include "lwip/opt.h"
#include "lwip/err.h"

#include <net_interfaces/flags.h>

#ifdef __cplusplus
extern "C" {
#endif

/* FIXME: this might be the bad place for this #define */
#define PBUF_PKT_SIZE 2048      // NOTE: size of each pbuf struct.

#define PBUF_TRANSPORT_HLEN 20
#define PBUF_IP_HLEN        20

    typedef enum {
        PBUF_TRANSPORT,
        PBUF_IP,
        PBUF_LINK,
        PBUF_RAW
    } pbuf_layer;

    typedef enum {
        PBUF_RAM,               /* pbuf data is stored in RAM */
        PBUF_ROM,               /* pbuf data is stored in ROM */
        PBUF_REF,               /* pbuf comes from the pbuf pool */
        PBUF_POOL               /* pbuf payload refers to RAM */
    } pbuf_type;


/** indicates this packet's data should be immediately passed to the application */
#define PBUF_FLAG_PUSH 0x01U

    struct pbuf {
  /** next pbuf in singly linked pbuf chain */
        struct pbuf *next;

  /** pointer to the actual data in the buffer */
        void *payload;

  /**
   * total length of this buffer and all next buffers in chain
   * belonging to the same packet.
   *
   * For non-queue packet chains this is the invariant:
   * p->tot_len == p->len + (p->next? p->next->tot_len: 0)
   */
        u16_t tot_len;

  /** length of this buffer */
        u16_t len;

  /** pbuf_type as u8_t instead of enum to save space */
         u8_t /*pbuf_type */ type;

  /** misc flags */
        u8_t flags;

  /**
   * the reference count always equals the number of pointers
   * that refer to this pbuf. This can be pointers from an application,
   * the stack itself, or pbuf->next pointers from a chain.
   */
        u16_t ref;

        /* buff len is the size of buffer allocated to this pbuf */
        u16_t buff_len;

        uint64_t nicflags;
    };

/* Initializes the pbuf module. This call is empty for now, but may not be in future. */
#define pbuf_init()

//#define pbuf_free(a)    do{ pbuf_free_tagged((a));  } while(0)
#define pbuf_free(a)    pbuf_free_tagged((a), (__func__), (__LINE__))
#define pbuf_ref(a)    pbuf_ref_tagged((a), (__func__), (__LINE__))
#define pbuf_alloc(l, len, t)    pbuf_alloc_tagged((l), (len), (t), (__func__), (__LINE__))

    void pbuf_ref_tagged(struct pbuf *p, const char *func_name, int line_no);
    struct pbuf *pbuf_alloc_tagged(pbuf_layer layer, u16_t length, pbuf_type type,
       const char *func_name, int line_no);
//    u8_t pbuf_free(struct pbuf *p);
    u8_t pbuf_free_tagged(struct pbuf * p, const char *func_name, int line_no);

    uint16_t free_pbuf_pool_count(void);
    void pbuf_realloc(struct pbuf *p, u16_t size);
    u8_t pbuf_header(struct pbuf *p, s16_t header_size);
//    void pbuf_ref(struct pbuf *p);
    void pbuf_ref_chain(struct pbuf *p);
//    u8_t pbuf_free(struct pbuf *p);
    u8_t pbuf_clen(struct pbuf *p);
    void pbuf_cat(struct pbuf *head, struct pbuf *tail);
    void pbuf_chain(struct pbuf *head, struct pbuf *tail);
    struct pbuf *pbuf_dechain(struct pbuf *p);
    err_t pbuf_copy(struct pbuf *p_to, struct pbuf *p_from);
    u16_t pbuf_copy_partial(struct pbuf *p, void *dataptr, u16_t len,
                            u16_t offset);
    err_t pbuf_take(struct pbuf *buf, const void *dataptr, u16_t len);
    struct pbuf *pbuf_coalesce(struct pbuf *p, pbuf_layer layer);

#ifdef __cplusplus
}
#endif
#endif                          /* __LWIP_PBUF_H__ */
