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/* vim:ts=8:sts=4:sw=4:noai:noexpandtab
 * basic receive window.
 * Copyright (c) 2006-2008 Miru Limited.
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

#ifndef __PGM_RXW_H__
#define __PGM_RXW_H__

#include <glib.h>

#ifndef __PGM_TIME_H__
#   include <pgm/time.h>

#ifndef __PGM_MSGV_H__
#   include <pgm/msgv.h>

#ifndef __PGM_PACKET_H__
#   include <pgm/packet.h>

#ifndef __PGM_SKBUFF_H__
#     include <pgm/skbuff.h>

#ifndef     __PGM_REED_SOLOMON_H__
#     include <pgm/reed_solomon.h>


typedef enum
    PGM_PKT_BACK_OFF_STATE,       /* PGM protocol recovery states */

    PGM_PKT_HAVE_DATA_STATE,      /* data received waiting to commit to application layer */

    PGM_PKT_HAVE_PARITY_STATE,          /* contains parity information not original data */
    PGM_PKT_COMMIT_DATA_STATE,          /* commited data waiting for purging */
    PGM_PKT_LOST_DATA_STATE,      /* if recovery fails, but packet has not yet been commited */
} pgm_pkt_state_e;

typedef enum
      PGM_RXW_OK = 0,
} pgm_rxw_returns_e;

struct pgm_rxw_state_t {
      pgm_time_t  nak_rb_expiry;
      pgm_time_t  nak_rpt_expiry;
      pgm_time_t  nak_rdata_expiry;

        pgm_pkt_state_e state;

      guint8            nak_transmit_count;
        guint8          ncf_retry_count;
        guint8          data_retry_count;

/* only valid on tg_sqn::pkt_sqn = 0 */
      unsigned    is_contiguous:1;  /* transmission group */

typedef struct pgm_rxw_state_t pgm_rxw_state_t;

/* must be smaller than PGM skbuff control buffer */
#     define G_PASTE_ARGS(identifier1,identifier2) identifier1 ## identifier2
#     define G_PASTE(identifier1,identifier2) G_PASTE_ARGS (identifier1, identifier2)
#     define G_STATIC_ASSERT(expr) typedef struct { char Compile_Time_Assertion[(expr) ? 1 : -1]; } G_PASTE (_GStaticAssert_, __LINE__)

G_STATIC_ASSERT(sizeof(struct pgm_rxw_state_t) <= sizeof(((struct pgm_sk_buff_t*)0)->cb));

struct pgm_rxw_t {
      const pgm_tsi_t*  tsi;

        GQueue          backoff_queue;
        GQueue          wait_ncf_queue;
        GQueue          wait_data_queue;
/* window context counters */
      guint32           lost_count;       /* failed to repair */
      guint32           fragment_count;         /* incomplete apdu */
      guint32           parity_count;           /* parity for repairs */
      guint32           committed_count;  /* but still in window */

        guint16         max_tpdu;               /* maximum packet size */
        guint32         lead, trail;
        guint32         rxw_trail, rxw_trail_init;
      guint32           commit_lead;
        unsigned        is_constrained:1;
        unsigned        is_defined:1;
      unsigned    has_event:1;            /* edge triggered */
      unsigned    is_fec_available:1;
      rs_t        rs;
      guint32           tg_size;          /* transmission group size for parity recovery */
      guint       tg_sqn_shift;

/* counters all guint32 */
      guint32           min_fill_time;          /* restricted from pgm_time_t */
      guint32           max_fill_time;
      guint32           min_nak_transmit_count;
      guint32           max_nak_transmit_count;
      guint32           cumulative_losses;
      guint32           bytes_delivered;
      guint32           msgs_delivered;

      gsize       size;             /* in bytes */
      guint       alloc;                  /* in pkts */
      struct pgm_sk_buff_t*   pdata[];

typedef struct pgm_rxw_t pgm_rxw_t;

PGM_GNUC_INTERNAL pgm_rxw_t* pgm_rxw_create (const pgm_tsi_t* const, const guint16, const guint32, const guint, const guint) G_GNUC_WARN_UNUSED_RESULT;
PGM_GNUC_INTERNAL void pgm_rxw_destroy (pgm_rxw_t* const);
PGM_GNUC_INTERNAL int pgm_rxw_add (pgm_rxw_t* const, struct pgm_sk_buff_t* const, const pgm_time_t, const pgm_time_t) G_GNUC_WARN_UNUSED_RESULT;
PGM_GNUC_INTERNAL void pgm_rxw_remove_commit (pgm_rxw_t* const);
PGM_GNUC_INTERNAL gssize pgm_rxw_readv (pgm_rxw_t* const, pgm_msgv_t**, const guint) G_GNUC_WARN_UNUSED_RESULT;
PGM_GNUC_INTERNAL guint pgm_rxw_remove_trail (pgm_rxw_t* const) G_GNUC_WARN_UNUSED_RESULT;
PGM_GNUC_INTERNAL guint pgm_rxw_update (pgm_rxw_t* const, const guint32, const guint32, const pgm_time_t, const pgm_time_t) G_GNUC_WARN_UNUSED_RESULT;
PGM_GNUC_INTERNAL void pgm_rxw_update_fec (pgm_rxw_t* const, const guint);
PGM_GNUC_INTERNAL int pgm_rxw_confirm (pgm_rxw_t* const, guint32, pgm_time_t, pgm_time_t, pgm_time_t) G_GNUC_WARN_UNUSED_RESULT;
PGM_GNUC_INTERNAL void pgm_rxw_lost (pgm_rxw_t* const, const guint32);
PGM_GNUC_INTERNAL void pgm_rxw_state (pgm_rxw_t*, struct pgm_sk_buff_t*, pgm_pkt_state_e);
PGM_GNUC_INTERNAL struct pgm_sk_buff_t* pgm_rxw_peek (pgm_rxw_t* const, const guint32) G_GNUC_WARN_UNUSED_RESULT;
PGM_GNUC_INTERNAL const char* pgm_pkt_state_string (pgm_pkt_state_e) G_GNUC_WARN_UNUSED_RESULT;
PGM_GNUC_INTERNAL const char* pgm_rxw_returns_string (pgm_rxw_returns_e) G_GNUC_WARN_UNUSED_RESULT;
PGM_GNUC_INTERNAL void pgm_rxw_dump (const pgm_rxw_t* const);

static inline guint pgm_rxw_max_length (const pgm_rxw_t* const window)
      g_assert (window);
      return window->alloc;

static inline guint32 pgm_rxw_length (const pgm_rxw_t* const window)
      g_assert (window);
      return ( 1 + window->lead ) - window->trail;

static inline gsize pgm_rxw_size (const pgm_rxw_t* const window)
      g_assert (window);
      return window->size;

static inline gboolean pgm_rxw_is_empty (const pgm_rxw_t* const window)
      g_assert (window);
      return pgm_rxw_length (window) == 0;

static inline gboolean pgm_rxw_is_full (const pgm_rxw_t* const window)
      g_assert (window);
      return pgm_rxw_length (window) == pgm_rxw_max_length (window);

static inline guint32 pgm_rxw_lead (const pgm_rxw_t* const window)
      g_assert (window);
      return window->lead;

static inline guint32 pgm_rxw_next_lead (const pgm_rxw_t* const window)
      return (guint32)(pgm_rxw_lead (window) + 1);


#endif /* __PGM_RXW_H__ */

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