src/io/basic_ifstrstream.hpp

/*
 * Copyright (C) 2000-2004  Object Oriented Parallel Simulation Engine (OOPSE) project
 * 
 * Contact: oopse@oopse.org
 * 
 * This program 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 2.1
 * of the License, or (at your option) any later version.
 * All we ask is that proper credit is given for our work, which includes
 * - but is not limited to - adding the above copyright notice to the beginning
 * of your source code files, and to any copyright notice that you may distribute
 * with programs based on this work.
 * 
 * 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 Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 */

/**
 * @file basic_ifstrstream.hpp
 * @author Teng Lin
 * @date 10/14/2004
 * @version 1.0
 */

#ifndef IO_IFSTRSTREAM_HPP
#define IO_IFSTRSTREAM_HPP

#include <cstring>
#include <fstream>
#include <sstream>

#ifdef IS_MPI
#include <mpi.h>
#endif

namespace oopse {
using namespace std;
/**
 * @class basic_ifstrstream basic_ifstrstream.hpp "io/basic_ifstrstream.hpp"
 * @brief class provides a stream interface to read data from files.
 * <p>In single mode, it falls back to ifstream. Don't need to read the whole file into memory.
 * In parallel mode, the master node will read the whole file and brocast it to other slave nodes.
 * After brocasting, every node will fall back to stringstream.</p>
 *
 * @code
 *       const int MAXLEN = 1024;
 *       char buffer[MAXLEN];
 *       ifstrstream in;
 *       in.open("Shapes.frc");
 *       if (in.is_open()) {
 *           in.getline(buffer, MAXLEN);
 *       }
 *       in.close();
 * @endcode
 */
template <class _CharT, class _Traits,  class _Alloc>
class basic_ifstrstream : public basic_istream<_CharT, _Traits> {
    public:
        //traits
        typedef _CharT                     char_type;
        typedef typename _Traits::int_type int_type;
        typedef typename _Traits::pos_type pos_type;
        typedef typename _Traits::off_type off_type;
        typedef _Traits                    traits_type;

        typedef basic_ios<_CharT, _Traits>                _Basic_ios;
        typedef basic_istream<_CharT, _Traits>            _Base;

#ifdef IS_MPI
         typedef basic_stringbuf<_CharT, _Traits, _Alloc>  _Buf;        
#else
        typedef basic_filebuf<_CharT, _Traits>            _Buf;
#endif

        static  const int FileNoExists = -1;
        static const int FileIOError = -2;
        
    public:
        
        /**  Constructs an object of class ifstream.  */
        basic_ifstrstream()
            : basic_ios<_CharT, _Traits>(),  basic_istream<_CharT, _Traits>(0),
              internalBuf_(NULL), isRead(false)  {

#ifdef IS_MPI         
            //in parallel mode, fall back to istringstream
            basic_stringbuf<_CharT, _Traits, _Alloc>* stringBuffer = new  basic_stringbuf<_CharT, _Traits, _Alloc>();
            internalBuf_ =  stringBuffer;
#else
            //in single version, fall back to ifstream
            basic_filebuf<_CharT, _Traits>* fileBuffer = new  basic_filebuf<_CharT, _Traits>();
            internalBuf_ =  fileBuffer;
#endif            

            this->init(internalBuf_);
            isRead = false;
        }
        
        /**
         * Explicit constructor
         * @filename String containing the name of the file to be opened
         * @mode Flags describing the requested i/o mode for the file, default value is ios_base::in      
         * @checkFilename Flags indicating checking the file name in parallel
         */
        explicit basic_ifstrstream(const char* filename, ios_base::openmode mode = ios_base::in, bool checkFilename = false)
            : basic_ios<_CharT, _Traits>(),  basic_istream<_CharT, _Traits>(0),
              internalBuf_(NULL), isRead(false) {

           isRead =  internalOpen(filename,  mode | ios_base::in, checkFilename);
         }

        /**
         * virtual destructor will close the file(in single mode) and clear the stream buffer
         */
        ~basic_ifstrstream(){
            close();
            delete internalBuf_;
            internalBuf_ = NULL;
        }

        /**
         * Opens a file and associats a buffer with the specified file to perform the i/o operations 
         * (single mode). Master reads a file and brocasts its content to the other slave nodes. After
         * brocasting, every nodes fall back to stringstream (parallel mode).
         * @filename String containing the name of the file to be opened
         * @mode Flags describing the requested i/o mode for the file
         * @checkFilename Flags indicating checking the file name in parallel
         */
        void open(const char* filename, ios_base::openmode mode = ios_base::in, bool checkFilename = false){

            if (!isRead ) {
                isRead = internalOpen(filename, mode, checkFilename);
            }
        }

        /**
         * Tests if the stream is currently associated with a valid  buffer.
         * @return true if a file has successfully been opened (single mode) or the whole file is read 
         * and spreaded among all of the processors (parallel mode),  otherwise false is returned
         */
        bool is_open ( ) {
#ifdef IS_MPI            
            return isRead; 
#else
            //single version fall back to ifstream
            return this->rdbuf()->is_open();
#endif
        }

        /**
         * In single mode, closes a file. The stream's file buffer is released from its association with
         * the currently open file. In parallel mode, clean the 
         */
        void close() {
#ifndef IS_MPI            
            //single version fall back to ifstream
            if (!this->rdbuf()->close())
                this->setstate(ios_base::failbit);
#endif             

            isRead = false;
        }
        
        /**
         * Gets the stream buffer object associated with the stream
         * @return   A pointer to the  stream buffe object(filebuf in single mode, stringbuf in 
         * parallel mode) associated with the stream.
         */
        _Buf* rdbuf() const{
            return static_cast<_Buf*>(internalBuf_); 
        }

    private:

        /**
         * Internal function used to open the file
         * @return true if succesfully opens a file (single mode) or gets the file content (parallel mode)
         * otherwise return false
         * @filename String containing the name of the file to be opened
         * @mode Flags describing the requested i/o mode for the file
         * @todo use try - catch syntax to make the program more readable
         */
        bool internalOpen(const char* filename, ios_base::openmode mode, bool checkFilename){

#ifdef IS_MPI         
            int commStatus;
            long fileSize;
            char* fbuf;
            int filenameLen;
            int diffFilename;
            int error;
            int myRank;
            int masterNode;

            commStatus = MPI_Comm_rank(MPI_COMM_WORLD, &myRank);
            masterNode = 0;
            
            if (myRank == masterNode) {

                if (checkFilename) {

                    //check the filename is the same
                    filenameLen = strlen(filename);
                    commStatus = MPI_Bcast(filenameLen, 1, MPI_INT, masterNode, MPI_COMM_WORLD);     
                    commStatus = MPI_Bcast(filename, filenameLen, MPI_CHAR, masterNode, MPI_COMM_WORLD);     

                    diffFilename = 0;
                    commStatus = MPI_Allreduce(diffFilename, error, 1,  MPI_INT,  MPI_COMM_WORLD);             

                    //if file names are different just return false
                    if (error > 0)
                        return false;   
                }
                
                ifstream fin(filename, mode);
                basic_stringbuf<_CharT, _Traits, _Alloc>* sbuf;

                if (fin.is_open()) {
                    
                    fin.in.seekg(0, ios::end); 
                    fileSize = fin.tellg(); 

                    // '\0' need one more char
                    fbuf = new char[fileSize+1];
                    
                    assert(fbuf != 0);

                    fin.read(fbuf, fileSize);

                    if (fin.fail())
                        fileSize = FileIOError;
                    
                    //brocasting the file size
                    commStatus = MPI_Bcast(&fileSize, 1, MPI_LONG, masterNode, MPI_COMM_WORLD);                   

                    if (fileSize < 0) {
                        fin.close();                    
                        delete fbuf;
                        
                        return false;
                    }
                    
                    // make a c-style string and brocasting it
                    fbuf[fileSize] = '\0';
                    commStatus = MPI_Bcast(fbuf, fileSize + 1, MPI_CHAR, masterNode, MPI_COMM_WORLD); 

                    //it is safe to delete null pointer
                    delete internalBuf_;

                    //initilaize istream
                    internalBuf_  = new basic_stringbuf<_CharT, _Traits, _Alloc>(fbuf, mode);
                    assert(internalBuf_);
                    this->init(internalBuf_);

                    //close the file and delete the buffer
                    fin.close();                    
                    delete fbuf;
                }else{
                    fileSize = FileNoExists;
                    commStatus = MPI_Bcast(&fileSize, 1, MPI_LONG, masterNode, MPI_COMM_WORLD);   
                    return false;
                }
               
             } else{
                    //check file name
                    if (checkFilename) {
                        commStatus = MPI_Bcast(filenameLen, 1, MPI_INT, masterNode, MPI_COMM_WORLD);     

                        char * masterFilename = new char[filenameLen];
                        commStatus = MPI_Bcast(masterFilename, filenameLen, MPI_CHAR, masterNode, MPI_COMM_WORLD);     
        
                        if( strcmp(masterFilename, filename) == 0)
                            diffFilename = 0;
                        else
                            diffFilename = 1;

                        delete masterFilename;
                        
                        commStatus = MPI_Allreduce(diffFilename, error, 1,  MPI_INT,  MPI_COMM_WORLD);    

                        if (error > 0)
                            return false;                        
                    }
                    //get file size
                    commStatus = MPI_Bcast(&fileSize, 1, MPI_LONG, masterNode, MPI_COMM_WORLD);   

                    if (fileSize >= 0 ) {
                        fbuf = new char[fileSize+1];
                        assert(fbuf);

                        //receive file content
                        commStatus = MPI_Bcast(fbuf, fileSize + 1, MPI_CHAR, masterNode, MPI_COMM_WORLD); 

                        //it is safe to delete null pointer
                        delete internalBuf_;

                        //initilaize istream                        
                        internalBuf_  = new basic_stringbuf<_CharT, _Traits, _Alloc>(fbuf, mode);
                        assert(internalBuf_);
                        this->init(internalBuf_);

                        delete fbuf;

                    } else if (fileSize == FileNoExists ) {
                        return false;

                    } else if (fileSize == FileIOError ) {
                        return false;
                    }
             }

#else
            //in single version, fall back to ifstream
            basic_filebuf<_CharT, _Traits>* fileBuffer = new  basic_filebuf<_CharT, _Traits>();

            this->init(fileBuffer);
            if (!fileBuffer->open(filename, mode))
                this->setstate(ios_base::failbit);

            //it is safe to delete null pointer
            delete internalBuf_;
 
           internalBuf_ =  fileBuffer;
#endif

            return true;
        }
        
        basic_streambuf<_CharT, _Traits>*  internalBuf_; /** internal stream buffer */        
        bool isRead;                                                                    /** file opened flag */
};

typedef basic_ifstrstream<char, char_traits<char>, allocator<char> > ifstrstream;
}//namespace oopse
#endif //IO_IFSTRSTREAM_HPP
Revision:	1582
Committed:	Fri Oct 15 20:42:25 2004 UTC (19 years, 8 months ago) by tim
File size:	12944 byte(s)
Log Message:	change const_cast to statc_const
#	Content
1	/*
2	* Copyright (C) 2000-2004 Object Oriented Parallel Simulation Engine (OOPSE) project
3	*
4	* Contact: oopse@oopse.org
5	*
6	* This program is free software; you can redistribute it and/or
7	* modify it under the terms of the GNU Lesser General Public License
8	* as published by the Free Software Foundation; either version 2.1
9	* of the License, or (at your option) any later version.
10	* All we ask is that proper credit is given for our work, which includes
11	* - but is not limited to - adding the above copyright notice to the beginning
12	* of your source code files, and to any copyright notice that you may distribute
13	* with programs based on this work.
14	*
15	* This program is distributed in the hope that it will be useful,
16	* but WITHOUT ANY WARRANTY; without even the implied warranty of
17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18	* GNU Lesser General Public License for more details.
19	*
20	* You should have received a copy of the GNU Lesser General Public License
21	* along with this program; if not, write to the Free Software
22	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23	*
24	*/
25
26	/**
27	* @file basic_ifstrstream.hpp
28	* @author Teng Lin
29	* @date 10/14/2004
30	* @version 1.0
31	*/
32
33	#ifndef IO_IFSTRSTREAM_HPP
34	#define IO_IFSTRSTREAM_HPP
35
36	#include <cstring>
37	#include <fstream>
38	#include <sstream>
39
40	#ifdef IS_MPI
41	#include <mpi.h>
42	#endif
43
44	namespace oopse {
45	using namespace std;
46	/**
47	* @class basic_ifstrstream basic_ifstrstream.hpp "io/basic_ifstrstream.hpp"
48	* @brief class provides a stream interface to read data from files.
49	* <p>In single mode, it falls back to ifstream. Don't need to read the whole file into memory.
50	* In parallel mode, the master node will read the whole file and brocast it to other slave nodes.
51	* After brocasting, every node will fall back to stringstream.</p>
52	*
53	* @code
54	* const int MAXLEN = 1024;
55	* char buffer[MAXLEN];
56	* ifstrstream in;
57	* in.open("Shapes.frc");
58	* if (in.is_open()) {
59	* in.getline(buffer, MAXLEN);
60	* }
61	* in.close();
62	* @endcode
63	*/
64	template <class _CharT, class _Traits, class _Alloc>
65	class basic_ifstrstream : public basic_istream<_CharT, _Traits> {
66	public:
67	//traits
68	typedef _CharT char_type;
69	typedef typename _Traits::int_type int_type;
70	typedef typename _Traits::pos_type pos_type;
71	typedef typename _Traits::off_type off_type;
72	typedef _Traits traits_type;
73
74	typedef basic_ios<_CharT, _Traits> _Basic_ios;
75	typedef basic_istream<_CharT, _Traits> _Base;
76
77	#ifdef IS_MPI
78	typedef basic_stringbuf<_CharT, _Traits, _Alloc> _Buf;
79	#else
80	typedef basic_filebuf<_CharT, _Traits> _Buf;
81	#endif
82
83	static const int FileNoExists = -1;
84	static const int FileIOError = -2;
85
86	public:
87
88	/** Constructs an object of class ifstream. */
89	basic_ifstrstream()
90	: basic_ios<_CharT, _Traits>(), basic_istream<_CharT, _Traits>(0),
91	internalBuf_(NULL), isRead(false) {
92
93	#ifdef IS_MPI
94	//in parallel mode, fall back to istringstream
95	basic_stringbuf<_CharT, _Traits, _Alloc>* stringBuffer = new basic_stringbuf<_CharT, _Traits, _Alloc>();
96	internalBuf_ = stringBuffer;
97	#else
98	//in single version, fall back to ifstream
99	basic_filebuf<_CharT, _Traits>* fileBuffer = new basic_filebuf<_CharT, _Traits>();
100	internalBuf_ = fileBuffer;
101	#endif
102
103	this->init(internalBuf_);
104	isRead = false;
105	}
106
107	/**
108	* Explicit constructor
109	* @filename String containing the name of the file to be opened
110	* @mode Flags describing the requested i/o mode for the file, default value is ios_base::in
111	* @checkFilename Flags indicating checking the file name in parallel
112	*/
113	explicit basic_ifstrstream(const char* filename, ios_base::openmode mode = ios_base::in, bool checkFilename = false)
114	: basic_ios<_CharT, _Traits>(), basic_istream<_CharT, _Traits>(0),
115	internalBuf_(NULL), isRead(false) {
116
117	isRead = internalOpen(filename, mode \| ios_base::in, checkFilename);
118	}
119
120	/**
121	* virtual destructor will close the file(in single mode) and clear the stream buffer
122	*/
123	~basic_ifstrstream(){
124	close();
125	delete internalBuf_;
126	internalBuf_ = NULL;
127	}
128
129	/**
130	* Opens a file and associats a buffer with the specified file to perform the i/o operations
131	* (single mode). Master reads a file and brocasts its content to the other slave nodes. After
132	* brocasting, every nodes fall back to stringstream (parallel mode).
133	* @filename String containing the name of the file to be opened
134	* @mode Flags describing the requested i/o mode for the file
135	* @checkFilename Flags indicating checking the file name in parallel
136	*/
137	void open(const char* filename, ios_base::openmode mode = ios_base::in, bool checkFilename = false){
138
139	if (!isRead ) {
140	isRead = internalOpen(filename, mode, checkFilename);
141	}
142	}
143
144	/**
145	* Tests if the stream is currently associated with a valid buffer.
146	* @return true if a file has successfully been opened (single mode) or the whole file is read
147	* and spreaded among all of the processors (parallel mode), otherwise false is returned
148	*/
149	bool is_open ( ) {
150	#ifdef IS_MPI
151	return isRead;
152	#else
153	//single version fall back to ifstream
154	return this->rdbuf()->is_open();
155	#endif
156	}
157
158	/**
159	* In single mode, closes a file. The stream's file buffer is released from its association with
160	* the currently open file. In parallel mode, clean the
161	*/
162	void close() {
163	#ifndef IS_MPI
164	//single version fall back to ifstream
165	if (!this->rdbuf()->close())
166	this->setstate(ios_base::failbit);
167	#endif
168
169	isRead = false;
170	}
171
172	/**
173	* Gets the stream buffer object associated with the stream
174	* @return A pointer to the stream buffe object(filebuf in single mode, stringbuf in
175	* parallel mode) associated with the stream.
176	*/
177	_Buf* rdbuf() const{
178	return static_cast<_Buf*>(internalBuf_);
179	}
180
181	private:
182
183	/**
184	* Internal function used to open the file
185	* @return true if succesfully opens a file (single mode) or gets the file content (parallel mode)
186	* otherwise return false
187	* @filename String containing the name of the file to be opened
188	* @mode Flags describing the requested i/o mode for the file
189	* @todo use try - catch syntax to make the program more readable
190	*/
191	bool internalOpen(const char* filename, ios_base::openmode mode, bool checkFilename){
192
193	#ifdef IS_MPI
194	int commStatus;
195	long fileSize;
196	char* fbuf;
197	int filenameLen;
198	int diffFilename;
199	int error;
200	int myRank;
201	int masterNode;
202
203	commStatus = MPI_Comm_rank(MPI_COMM_WORLD, &myRank);
204	masterNode = 0;
205
206	if (myRank == masterNode) {
207
208	if (checkFilename) {
209
210	//check the filename is the same
211	filenameLen = strlen(filename);
212	commStatus = MPI_Bcast(filenameLen, 1, MPI_INT, masterNode, MPI_COMM_WORLD);
213	commStatus = MPI_Bcast(filename, filenameLen, MPI_CHAR, masterNode, MPI_COMM_WORLD);
214
215	diffFilename = 0;
216	commStatus = MPI_Allreduce(diffFilename, error, 1, MPI_INT, MPI_COMM_WORLD);
217
218	//if file names are different just return false
219	if (error > 0)
220	return false;
221	}
222
223	ifstream fin(filename, mode);
224	basic_stringbuf<_CharT, _Traits, _Alloc>* sbuf;
225
226	if (fin.is_open()) {
227
228	fin.in.seekg(0, ios::end);
229	fileSize = fin.tellg();
230
231	// '\0' need one more char
232	fbuf = new char[fileSize+1];
233
234	assert(fbuf != 0);
235
236	fin.read(fbuf, fileSize);
237
238	if (fin.fail())
239	fileSize = FileIOError;
240
241	//brocasting the file size
242	commStatus = MPI_Bcast(&fileSize, 1, MPI_LONG, masterNode, MPI_COMM_WORLD);
243
244	if (fileSize < 0) {
245	fin.close();
246	delete fbuf;
247
248	return false;
249	}
250
251	// make a c-style string and brocasting it
252	fbuf[fileSize] = '\0';
253	commStatus = MPI_Bcast(fbuf, fileSize + 1, MPI_CHAR, masterNode, MPI_COMM_WORLD);
254
255	//it is safe to delete null pointer
256	delete internalBuf_;
257
258	//initilaize istream
259	internalBuf_ = new basic_stringbuf<_CharT, _Traits, _Alloc>(fbuf, mode);
260	assert(internalBuf_);
261	this->init(internalBuf_);
262
263	//close the file and delete the buffer
264	fin.close();
265	delete fbuf;
266	}else{
267	fileSize = FileNoExists;
268	commStatus = MPI_Bcast(&fileSize, 1, MPI_LONG, masterNode, MPI_COMM_WORLD);
269	return false;
270	}
271
272	} else{
273	//check file name
274	if (checkFilename) {
275	commStatus = MPI_Bcast(filenameLen, 1, MPI_INT, masterNode, MPI_COMM_WORLD);
276
277	char * masterFilename = new char[filenameLen];
278	commStatus = MPI_Bcast(masterFilename, filenameLen, MPI_CHAR, masterNode, MPI_COMM_WORLD);
279
280	if( strcmp(masterFilename, filename) == 0)
281	diffFilename = 0;
282	else
283	diffFilename = 1;
284
285	delete masterFilename;
286
287	commStatus = MPI_Allreduce(diffFilename, error, 1, MPI_INT, MPI_COMM_WORLD);
288
289	if (error > 0)
290	return false;
291	}
292	//get file size
293	commStatus = MPI_Bcast(&fileSize, 1, MPI_LONG, masterNode, MPI_COMM_WORLD);
294
295	if (fileSize >= 0 ) {
296	fbuf = new char[fileSize+1];
297	assert(fbuf);
298
299	//receive file content
300	commStatus = MPI_Bcast(fbuf, fileSize + 1, MPI_CHAR, masterNode, MPI_COMM_WORLD);
301
302	//it is safe to delete null pointer
303	delete internalBuf_;
304
305	//initilaize istream
306	internalBuf_ = new basic_stringbuf<_CharT, _Traits, _Alloc>(fbuf, mode);
307	assert(internalBuf_);
308	this->init(internalBuf_);
309
310	delete fbuf;
311
312	} else if (fileSize == FileNoExists ) {
313	return false;
314
315	} else if (fileSize == FileIOError ) {
316	return false;
317	}
318	}
319
320	#else
321	//in single version, fall back to ifstream
322	basic_filebuf<_CharT, _Traits>* fileBuffer = new basic_filebuf<_CharT, _Traits>();
323
324	this->init(fileBuffer);
325	if (!fileBuffer->open(filename, mode))
326	this->setstate(ios_base::failbit);
327
328	//it is safe to delete null pointer
329	delete internalBuf_;
330
331	internalBuf_ = fileBuffer;
332	#endif
333
334	return true;
335	}
336
337	basic_streambuf<_CharT, _Traits>* internalBuf_; /** internal stream buffer */
338	bool isRead; /** file opened flag */
339	};
340
341	typedef basic_ifstrstream<char, char_traits<char>, allocator<char> > ifstrstream;
342	}//namespace oopse
343	#endif //IO_IFSTRSTREAM_HPP