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/******************************************************************************/
/* */
/* X r d S s i S t r e a m A c t i v e . c c */
/* */
/* (c) 2014 by the Board of Trustees of the Leland Stanford, Jr., University */
/* Produced by Andrew Hanushevsky for Stanford University under contract */
/* DE-AC02-76-SFO0515 with the Department of Energy */
/* */
/* This file is part of the XRootD software suite. */
/* */
/* XRootD 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 3 of the License, or (at your */
/* option) any later version. */
/* */
/* XRootD 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 Lesser General Public */
/* License for more details. */
/* */
/* You should have received a copy of the GNU Lesser General Public License */
/* along with XRootD in a file called COPYING.LESSER (LGPL license) and file */
/* COPYING (GPL license). If not, see <http://www.gnu.org/licenses/>. */
/* */
/* The copyright holder's institutional names and contributor's names may not */
/* be used to endorse or promote products derived from this software without */
/* specific prior written permission of the institution or contributor. */
/******************************************************************************/
#include <iostream>
#include <stdlib.h>
#include "XrdSsi/XrdSsiErrInfo.hh"
#include "XrdSsiSvStreamActive.hh"
using namespace std;
/******************************************************************************/
/* L o c a l C l a s s e s */
/******************************************************************************/
// Here we define the actual implementation of the Buffer object that we need
// to return. It's very simple in that when it gets recycled it frees the data
// buffer and simply deletes itself. This is not every efficient and actual
// implementations would use reusable buffer pools and buffer objects to avoid
// constantly using new/delete/free.
//
class myBuffer : public XrdSsiStream::Buffer
{
public:
void Recycle()
{
if (data)
free(data);
delete this;
}
myBuffer(char *buff) : Buffer(buff) {}
~myBuffer() {}
};
/******************************************************************************/
/* G e t B u f f */
/******************************************************************************/
XrdSsiStream::Buffer *XrdSsiSvStreamActive::GetBuff(XrdSsiErrInfo &eInfo, int &dlen, bool &last)
{
myBuffer *sbP;
char *buff;
int buffsz;
// Check if we should return an error (this occurs after the first successful
// read so we can see if we get a buffer back).
//
if (rdSZ < 0)
{
if (didRead)
{
eInfo.Set(0, EIO);
return 0;
}
else
buffsz = -rdSZ;
}
else
buffsz = (rdSZ ? rdSZ : dlen);
didRead = true;
// Normally we would have a buffer pool to avoid constant malloc and free
// calls. But for simplicity we just allocate a buffer of the right size.
//
if (!(buff = (char *)malloc(buffsz)))
{
eInfo.Set(0, ENOMEM);
return 0;
}
// Now get the data
//
if ((dlen = read(theFD, buff, buffsz)) < 0)
{
eInfo.Set(0, errno);
free(buff);
return 0;
}
// The last parameter is used to prevent needless calls and we set it if we
// know that no more data remains. This is simple for us but may be more
// complicated for unusual data sources.
//
last = (dlen < buffsz);
// Now we allocate a buffer object. We would have a pool of those as well in
// a real situtaion, but no need to be fancy here. Note that the buffer
// object is meant to be inherited by data generators.
//
sbP = new myBuffer(buff);
cerr << "Active stream GetBuff: " << hex << sbP << dec << " sz=" << dlen << endl;
return sbP;
}
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