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hblpp.c
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hblpp.c
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/*
* Length Prefix Protocol
*
* Copyright 2010 Mindaugas Kavaliauskas <dbtopas / at / dbtopas.lt>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; see the file LICENSE.txt. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301 USA (or visit https://www.gnu.org/licenses/).
*
* As a special exception, the Harbour Project gives permission for
* additional uses of the text contained in its release of Harbour.
*
* The exception is that, if you link the Harbour libraries with other
* files to produce an executable, this does not by itself cause the
* resulting executable to be covered by the GNU General Public License.
* Your use of that executable is in no way restricted on account of
* linking the Harbour library code into it.
*
* This exception does not however invalidate any other reasons why
* the executable file might be covered by the GNU General Public License.
*
* This exception applies only to the code released by the Harbour
* Project under the name Harbour. If you copy code from other
* Harbour Project or Free Software Foundation releases into a copy of
* Harbour, as the General Public License permits, the exception does
* not apply to the code that you add in this way. To avoid misleading
* anyone as to the status of such modified files, you must delete
* this exception notice from them.
*
* If you write modifications of your own for Harbour, it is your choice
* whether to permit this exception to apply to your modifications.
* If you do not wish that, delete this exception notice.
*
*/
#include "hbapiitm.h"
#include "hbapierr.h"
#include "hbdate.h"
#include "hblpp.h"
PHB_LPP hb_lppCreate( HB_SOCKET sd )
{
PHB_LPP pSocket;
pSocket = ( PHB_LPP ) hb_xgrabz( sizeof( HB_LPP ) );
pSocket->sd = sd;
pSocket->nLimit = 1024;
return pSocket;
}
void hb_lppDestroy( PHB_LPP pSocket )
{
if( pSocket->pSendBuffer )
hb_xfree( pSocket->pSendBuffer );
if( pSocket->pRecvBuffer )
hb_xfree( pSocket->pRecvBuffer );
hb_xfree( pSocket );
}
void hb_lppSetLimit( PHB_LPP pSocket, HB_SIZE nLimit )
{
pSocket->nLimit = nLimit;
}
int hb_lppError( PHB_LPP pSocket )
{
return pSocket->iError;
}
HB_BOOL hb_lppSend( PHB_LPP pSocket, const void * data, HB_SIZE len, HB_MAXINT timeout )
{
HB_MAXUINT timer;
long lSend;
if( ! pSocket->pSendBuffer )
{
pSocket->pSendBuffer = ( char * ) hb_xgrab( len + 4 );
HB_PUT_LE_UINT32( pSocket->pSendBuffer, len );
hb_xmemcpy( pSocket->pSendBuffer + 4, data, len );
pSocket->nSendLen = len + 4;
pSocket->nSendPos = 0;
}
timer = hb_timerInit( timeout );
for( ;; )
{
if( pSocket->nSendLen - pSocket->nSendPos < ( HB_SIZE ) LONG_MAX )
lSend = ( long ) ( pSocket->nSendLen - pSocket->nSendPos );
else
lSend = LONG_MAX;
lSend = hb_socketSend( pSocket->sd, pSocket->pSendBuffer + pSocket->nSendPos, lSend, 0, timeout );
if( lSend == -1 )
{
pSocket->iError = hb_socketGetError();
return HB_FALSE;
}
pSocket->nSendPos += lSend;
if( pSocket->nSendPos == pSocket->nSendLen )
{
hb_xfree( pSocket->pSendBuffer );
pSocket->pSendBuffer = NULL;
pSocket->iError = 0;
return HB_TRUE;
}
if( ( timeout = hb_timerTest( timeout, &timer ) ) == 0 )
{
pSocket->iError = HB_SOCKET_ERR_TIMEOUT;
return HB_FALSE;
}
}
}
HB_BOOL hb_lppRecv( PHB_LPP pSocket, void ** data, HB_SIZE * len, HB_MAXINT timeout )
{
HB_MAXUINT timer;
long lRecv;
if( ! pSocket->pRecvBuffer )
{
pSocket->pRecvBuffer = ( char * ) hb_xgrab( 4 );
pSocket->nRecvLen = 0;
pSocket->fRecvHasSize = HB_FALSE;
}
timer = hb_timerInit( timeout );
for( ;; )
{
if( ! pSocket->fRecvHasSize )
{
lRecv = ( long ) ( 4 - pSocket->nRecvLen );
lRecv = hb_socketRecv( pSocket->sd, pSocket->pRecvBuffer + pSocket->nRecvLen, lRecv, 0, timeout );
if( lRecv == -1 )
{
pSocket->iError = hb_socketGetError();
return HB_FALSE;
}
else if( lRecv == 0 )
{
/* peer closed connection */
pSocket->iError = 0;
return HB_FALSE;
}
pSocket->nRecvLen += lRecv;
if( pSocket->nRecvLen < 4 )
{
pSocket->iError = HB_SOCKET_ERR_TIMEOUT;
return HB_FALSE;
}
pSocket->nRecvSize = HB_GET_UINT32( pSocket->pRecvBuffer );
if( pSocket->nLimit && pSocket->nRecvSize > pSocket->nLimit )
{
/* protection against remote memory exhaust attack */
pSocket->iError = HB_LPP_ERR_TOOLARGE;
hb_xfree( pSocket->pRecvBuffer );
pSocket->pRecvBuffer = NULL;
return HB_FALSE;
}
pSocket->nRecvLen = 0;
pSocket->fRecvHasSize = HB_TRUE;
if( pSocket->nRecvSize != 4 )
pSocket->pRecvBuffer = ( char * ) hb_xrealloc( pSocket->pRecvBuffer, pSocket->nRecvSize );
}
if( pSocket->nRecvSize - pSocket->nRecvLen < ( HB_SIZE ) LONG_MAX )
lRecv = ( long ) ( pSocket->nRecvSize - pSocket->nRecvLen );
else
lRecv = LONG_MAX;
lRecv = hb_socketRecv( pSocket->sd, pSocket->pRecvBuffer + pSocket->nRecvLen, lRecv, 0, timeout );
if( lRecv == -1 )
{
pSocket->iError = hb_socketGetError();
return HB_FALSE;
}
else if( lRecv == 0 )
{
/* peer closed connection */
pSocket->iError = 0;
return HB_FALSE;
}
pSocket->nRecvLen += lRecv;
if( pSocket->nRecvSize == pSocket->nRecvLen )
{
*data = pSocket->pRecvBuffer;
*len = pSocket->nRecvLen;
pSocket->pRecvBuffer = NULL;
pSocket->iError = 0;
return HB_TRUE;
}
if( ( timeout = hb_timerTest( timeout, &timer ) ) == 0 )
{
pSocket->iError = HB_SOCKET_ERR_TIMEOUT;
return HB_FALSE;
}
}
}
HB_SIZE hb_lppSendLen( PHB_LPP pSocket )
{
return pSocket->nSendLen - pSocket->nSendPos;
}
HB_SIZE hb_lppRecvLen( PHB_LPP pSocket )
{
return pSocket->nRecvLen;
}