source: vbox/trunk/src/VBox/GuestHost/OpenGL/util/devnull.c@ 71930

/* Copyright (c) 2001, Stanford University
 * All rights reserved
 *
 * See the file LICENSE.txt for information on redistributing this software.
 */

#include "cr_net.h"
#include "cr_mem.h"
#include "cr_error.h"
#include "net_internals.h"

static void
crDevnullWriteExact( CRConnection *conn, const void *buf, unsigned int len )
{
        (void) conn;
        (void) buf;
        (void) len;
}

static void *
crDevnullAlloc( CRConnection *conn )
{
        return crAlloc( conn->buffer_size );
}

static void
crDevnullSingleRecv( CRConnection *conn, void *buf, unsigned int len )
{
        crError( "You can't receive data on a devnull connection!" );
        (void) conn;
        (void) buf;
        (void) len;
}

static void
crDevnullFree( CRConnection *conn, void *buf )
{
        crFree( buf );
        (void) conn;
}

static void
crDevnullSend( CRConnection *conn, void **bufp,
                                 const void *start, unsigned int len )
{
        
        if (bufp)
        {
                /* We're sending something we've allocated.  It's now ours. 
                 * If the callers wants to send something else, he'll allocate 
                 * something else. 
                 * 
                 * ENFORCE IT! */

                crDevnullFree( conn, *bufp );
        }
        (void) conn;
        (void) bufp;
        (void) start;
        (void) len;
}

int
crDevnullRecv( void )
{
        crError( "You can't receive data on a DevNull network, stupid." );
        return 0;
}

void
crDevnullInit( CRNetReceiveFuncList *rfl, CRNetCloseFuncList *cfl, unsigned int mtu )
{
        (void) rfl;
        (void) cfl;
        (void) mtu;
}

static void
crDevnullAccept( CRConnection *conn, const char *hostname, unsigned short port )
{
        crError( "Well, you *could* accept a devnull client, but you'd be disappointed. ");
        (void) conn;
        (void) port;
        (void) hostname;
}

static int
crDevnullDoConnect( CRConnection *conn )
{
        (void) conn; 
        return 1;
}

static void
crDevnullDoDisconnect( CRConnection *conn )
{
        (void) conn;
}

void crDevnullConnection( CRConnection *conn )
{
        conn->type  = CR_DROP_PACKETS;
        conn->Alloc = crDevnullAlloc;
        conn->Send  = crDevnullSend;
        conn->SendExact  = crDevnullWriteExact;
        conn->Recv  = crDevnullSingleRecv;
        conn->Free  = crDevnullFree;
        conn->Accept = crDevnullAccept;
        conn->Connect = crDevnullDoConnect;
        conn->Disconnect = crDevnullDoDisconnect;
        conn->actual_network = 0;
}

CRConnection** crDevnullDump( int * num )
{
        *num = 0;
        return NULL;
}