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/* The zlibwrap object.
*
* This is an rsyslog object wrapper around zlib.
*
* Copyright 2009 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of the rsyslog runtime library.
*
* The rsyslog runtime 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 3 of the License, or
* (at your option) any later version.
*
* The rsyslog runtime library 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 the rsyslog runtime library. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
* A copy of the LGPL can be found in the file "COPYING.LESSER" in this distribution.
*/
#include "config.h"
#include <string.h>
#include <assert.h>
#include <zlib.h>
#include "rsyslog.h"
#include "module-template.h"
#include "obj.h"
#include "zlibw.h"
MODULE_TYPE_LIB
/* static data */
DEFobjStaticHelpers
/* ------------------------------ methods ------------------------------ */
/* zlib make strong use of macros for its interface functions, so we can not simply
* pass function pointers to them. Instead, we create very small wrappers which call
* the relevant entry points.
*/
static int myDeflateInit(z_streamp strm, int level)
{
return deflateInit(strm, level);
}
static int myDeflateInit2(z_streamp strm, int level, int method, int windowBits, int memLevel, int strategy)
{
return deflateInit2(strm, level, method, windowBits, memLevel, strategy);
}
static int myDeflateEnd(z_streamp strm)
{
return deflateEnd(strm);
}
static int myDeflate(z_streamp strm, int flush)
{
return deflate(strm, flush);
}
/* queryInterface function
* rgerhards, 2008-03-05
*/
BEGINobjQueryInterface(zlibw)
CODESTARTobjQueryInterface(zlibw)
if(pIf->ifVersion != zlibwCURR_IF_VERSION) { /* check for current version, increment on each change */
ABORT_FINALIZE(RS_RET_INTERFACE_NOT_SUPPORTED);
}
/* ok, we have the right interface, so let's fill it
* Please note that we may also do some backwards-compatibility
* work here (if we can support an older interface version - that,
* of course, also affects the "if" above).
*/
pIf->DeflateInit = myDeflateInit;
pIf->DeflateInit2 = myDeflateInit2;
pIf->Deflate = myDeflate;
pIf->DeflateEnd = myDeflateEnd;
finalize_it:
ENDobjQueryInterface(zlibw)
/* Initialize the zlibw class. Must be called as the very first method
* before anything else is called inside this class.
* rgerhards, 2008-02-19
*/
BEGINAbstractObjClassInit(zlibw, 1, OBJ_IS_LOADABLE_MODULE) /* class, version */
/* request objects we use */
/* set our own handlers */
ENDObjClassInit(zlibw)
/* --------------- here now comes the plumbing that makes as a library module --------------- */
BEGINmodExit
CODESTARTmodExit
ENDmodExit
BEGINqueryEtryPt
CODESTARTqueryEtryPt
CODEqueryEtryPt_STD_LIB_QUERIES
ENDqueryEtryPt
BEGINmodInit()
CODESTARTmodInit
*ipIFVersProvided = CURR_MOD_IF_VERSION; /* we only support the current interface specification */
CHKiRet(zlibwClassInit(pModInfo)); /* must be done after tcps_sess, as we use it */
/* Initialize all classes that are in our module - this includes ourselfs */
ENDmodInit
/* vi:set ai:
*/
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