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/* Definition of serial stream class (strm).
*
* A serial stream provides serial data access. In theory, serial streams
* can be implemented via a number of methods (e.g. files or in-memory
* streams). In practice, there currently only exist the file type (aka
* "driver").
*
* In practice, many stream features are bound to files. I have not yet made
* any serious effort, except for the naming of this class, to try to make
* the interfaces very generic. However, I assume that we could work much
* like in the strm class, where some properties are simply ignored when
* the wrong strm mode is selected (which would translate here to the wrong
* stream mode).
*
* Most importantly, this class provides generic input and output functions
* which can directly be used to work with the strms and file output. It
* provides such useful things like a circular file buffer and, hopefully
* at a later stage, a lazy writer. The object is also seriazable and thus
* can easily be persistet. The bottom line is that it makes much sense to
* use this class whereever possible as its features may grow in the future.
*
* Copyright 2008 Rainer Gerhards and Adiscon GmbH.
*
* This file is part of rsyslog.
*
* Rsyslog 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 3 of the License, or
* (at your option) any later version.
*
* Rsyslog 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 Rsyslog. If not, see <http://www.gnu.org/licenses/>.
*
* A copy of the GPL can be found in the file "COPYING" in this distribution.
*/
#ifndef STREAM_H_INCLUDED
#define STREAM_H_INCLUDED
#include <pthread.h>
#include "obj-types.h"
#include "glbl.h"
#include "stream.h"
/* stream types */
typedef enum {
STREAMTYPE_FILE_SINGLE = 0, /**< read a single file */
STREAMTYPE_FILE_CIRCULAR = 1, /**< circular files */
STREAMTYPE_FILE_MONITOR = 2 /**< monitor a (third-party) file */
} strmType_t;
typedef enum {
STREAMMMODE_INVALID = 0,
STREAMMODE_READ = 1,
STREAMMODE_WRITE = 2
} strmMode_t;
/* The strm_t data structure */
typedef struct strm_s {
BEGINobjInstance; /* Data to implement generic object - MUST be the first data element! */
strmType_t sType;
/* descriptive properties */
int iCurrFNum;/* current file number (NOT descriptor, but the number in the file name!) */
uchar *pszFName; /* prefix for generated filenames */
int lenFName;
strmMode_t tOperationsMode;
mode_t tOpenMode;
int iAddtlOpenFlags; /* can be used to specifiy additional (compatible!) open flags */
int64 iMaxFileSize;/* maximum size a file may grow to */
int iMaxFiles; /* maximum number of files if a circular mode is in use */
int iFileNumDigits;/* min number of digits to use in file number (only in circular mode) */
int bDeleteOnClose; /* set to 1 to auto-delete on close -- be careful with that setting! */
int64 iCurrOffs;/* current offset */
int64 *pUsrWCntr; /* NULL or a user-provided counter that receives the nbr of bytes written since the last CntrSet() */
/* dynamic properties, valid only during file open, not to be persistet */
size_t sIOBufSize;/* size of IO buffer */
uchar *pszDir; /* Directory */
int lenDir;
int fd; /* the file descriptor, -1 if closed */
uchar *pszCurrFName; /* name of current file (if open) */
uchar *pIOBuf; /* io Buffer */
size_t iBufPtrMax; /* current max Ptr in Buffer (if partial read!) */
size_t iBufPtr; /* pointer into current buffer */
int iUngetC; /* char set via UngetChar() call or -1 if none set */
int bInRecord; /* if 1, indicates that we are currently writing a not-yet complete record */
} strm_t;
/* interfaces */
BEGINinterface(strm) /* name must also be changed in ENDinterface macro! */
ENDinterface(strm)
#define strmCURR_IF_VERSION 1 /* increment whenever you change the interface structure! */
/* prototypes */
rsRetVal strmConstruct(strm_t **ppThis);
rsRetVal strmConstructFinalize(strm_t __attribute__((unused)) *pThis);
rsRetVal strmDestruct(strm_t **ppThis);
rsRetVal strmSetMaxFileSize(strm_t *pThis, int64 iMaxFileSize);
rsRetVal strmSetFileName(strm_t *pThis, uchar *pszName, size_t iLenName);
rsRetVal strmReadChar(strm_t *pThis, uchar *pC);
rsRetVal strmUnreadChar(strm_t *pThis, uchar c);
rsRetVal strmReadLine(strm_t *pThis, cstr_t **ppCStr);
rsRetVal strmSeekCurrOffs(strm_t *pThis);
rsRetVal strmWrite(strm_t *pThis, uchar *pBuf, size_t lenBuf);
rsRetVal strmWriteChar(strm_t *pThis, uchar c);
rsRetVal strmWriteLong(strm_t *pThis, long i);
rsRetVal strmSetFName(strm_t *pThis, uchar *pszPrefix, size_t iLenPrefix);
rsRetVal strmSetDir(strm_t *pThis, uchar *pszDir, size_t iLenDir);
rsRetVal strmFlush(strm_t *pThis);
rsRetVal strmRecordBegin(strm_t *pThis);
rsRetVal strmRecordEnd(strm_t *pThis);
rsRetVal strmSerialize(strm_t *pThis, strm_t *pStrm);
rsRetVal strmSetiAddtlOpenFlags(strm_t *pThis, int iNewVal);
rsRetVal strmGetCurrOffset(strm_t *pThis, int64 *pOffs);
rsRetVal strmSetWCntr(strm_t *pThis, number_t *pWCnt);
PROTOTYPEObjClassInit(strm);
PROTOTYPEpropSetMeth(strm, bDeleteOnClose, int);
PROTOTYPEpropSetMeth(strm, iMaxFileSize, int);
PROTOTYPEpropSetMeth(strm, iMaxFiles, int);
PROTOTYPEpropSetMeth(strm, iFileNumDigits, int);
PROTOTYPEpropSetMeth(strm, tOperationsMode, int);
PROTOTYPEpropSetMeth(strm, tOpenMode, mode_t);
PROTOTYPEpropSetMeth(strm, sType, strmType_t);
#endif /* #ifndef STREAM_H_INCLUDED */
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