--- /dev/null
+/* Copyright (c) 2012. The SimGrid Team.
+ * All rights reserved. */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+#ifndef BITTORRENT_PEER_H
+#define BITTORRENT_PEER_H
+#include <msg/msg.h>
+#include <xbt/dict.h>
+#include <xbt/dynar.h>
+#include <xbt/RngStream.h>
+#include "connection.h"
+#include "bittorrent.h"
+
+/**
+ * Peer data
+ */
+typedef struct s_peer {
+ int id; //peer id
+
+ int pieces; //number of pieces the peer has.
+ char *bitfield; //list of pieces the peer has.
+ char *bitfield_blocks; //list of blocks the peer has.
+ short *pieces_count; //number of peers that have each piece.
+
+ xbt_dynar_t current_pieces; //current pieces the peer is downloading
+ int current_piece; //current pieces
+ int pieces_requested; //number of pieces the peer has requested
+
+ xbt_dict_t peers; //peers list
+ xbt_dict_t active_peers; //active peers list
+
+ char mailbox[MAILBOX_SIZE]; //peer mailbox.
+ char mailbox_tracker[MAILBOX_SIZE]; //pair mailbox while communicating with the tracker.
+ const char *hostname; //peer hostname
+
+ msg_task_t task_received; //current task being received
+ msg_comm_t comm_received; //current comm
+
+ int round; //current round for the chocking algortihm.
+
+ RngStream stream; //RngStream for
+
+ double begin_receive_time; //time when the receiving communication has begun, useful for calculating host speed.
+} s_peer_t, *peer_t;
+
+/**
+ * Peer main function
+ */
+int peer(int argc, char *argv[]);
+
+int get_peers_data(peer_t peer);
+void leech_loop(peer_t peer, double deadline);
+void seed_loop(peer_t peer, double deadline);
+
+void peer_init(peer_t, int id, int seed);
+void peer_free(peer_t peer);
+
+int has_finished(char *bitfield);
+
+void handle_message(peer_t peer, msg_task_t task);
+
+void wait_for_pieces( peer_t peer, double deadline);
+
+void update_pieces_count_from_bitfield(peer_t peer, char *bitfield);
+void update_current_piece(peer_t peer);
+void update_choked_peers(peer_t peer);
+
+void update_interested_after_receive(peer_t peer);
+
+void update_bitfield_blocks(peer_t peer, int index, int block_index, int block_length);
+int piece_complete(peer_t peer, int index);
+int get_first_block(peer_t peer, int piece);
+
+
+void send_requests_to_peer(peer_t peer, connection_t remote_peer);
+
+void send_interested_to_peers(peer_t peer);
+void send_handshake_all(peer_t peer);
+
+void send_interested(peer_t peer, const char *mailbox);
+
+void send_notinterested(peer_t peer, const char *mailbox);
+void send_handshake(peer_t peer, const char *mailbox);
+void send_bitfield(peer_t peer, const char *mailbox);
+void send_choked(peer_t peer, const char *mailbox);
+void send_unchoked(peer_t peer, const char *mailbox);
+void send_have(peer_t peer, int piece);
+
+void send_request(peer_t peer, const char *mailbox, int piece,int block_index, int block_length);
+void send_piece(peer_t peer, const char *mailbox, int piece, int stalled, int block_index, int block_length);
+
+int in_current_pieces(peer_t peer, int piece);
+#endif /* BITTORRENT_PEER_H */
