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 <cassert>
#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((void*)filename, filenameLen, MPI_CHAR, masterNode, MPI_COMM_WORLD);     

                    diffFilename = 0;
                    commStatus = MPI_Allreduce(&diffFilename, &error, 1,  MPI_INT, MPI_SUM,  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.seekg(0, ios::end); 
                    fileSize = fin.tellg(); 
                    fin.seekg(0, ios::beg);
                    
                    // '\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_SUM, 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:	1583
Committed:	Fri Oct 15 21:10:50 2004 UTC (19 years, 8 months ago) by tim
File size:	13055 byte(s)
Log Message:	fix a bunch of bugs
#	User	Rev	Content
1	tim	1570	/*
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	tim	1583	#include <cassert>
37	tim	1572	#include <cstring>
38	tim	1570	#include <fstream>
39			#include <sstream>
40
41	tim	1572	#ifdef IS_MPI
42	tim	1577	#include <mpi.h>
43	tim	1572	#endif
44
45	tim	1570	namespace oopse {
46			using namespace std;
47			/**
48			* @class basic_ifstrstream basic_ifstrstream.hpp "io/basic_ifstrstream.hpp"
49			* @brief class provides a stream interface to read data from files.
50			* <p>In single mode, it falls back to ifstream. Don't need to read the whole file into memory.
51			* In parallel mode, the master node will read the whole file and brocast it to other slave nodes.
52			* After brocasting, every node will fall back to stringstream.</p>
53			*
54			* @code
55			* const int MAXLEN = 1024;
56			* char buffer[MAXLEN];
57			* ifstrstream in;
58			* in.open("Shapes.frc");
59	tim	1572	* if (in.is_open()) {
60	tim	1570	* in.getline(buffer, MAXLEN);
61			* }
62			* in.close();
63			* @endcode
64			*/
65			template <class _CharT, class _Traits, class _Alloc>
66			class basic_ifstrstream : public basic_istream<_CharT, _Traits> {
67			public:
68			//traits
69			typedef _CharT char_type;
70			typedef typename _Traits::int_type int_type;
71			typedef typename _Traits::pos_type pos_type;
72			typedef typename _Traits::off_type off_type;
73			typedef _Traits traits_type;
74
75			typedef basic_ios<_CharT, _Traits> _Basic_ios;
76			typedef basic_istream<_CharT, _Traits> _Base;
77
78			#ifdef IS_MPI
79			typedef basic_stringbuf<_CharT, _Traits, _Alloc> _Buf;
80			#else
81			typedef basic_filebuf<_CharT, _Traits> _Buf;
82			#endif
83
84			static const int FileNoExists = -1;
85			static const int FileIOError = -2;
86
87			public:
88
89			/** Constructs an object of class ifstream. */
90			basic_ifstrstream()
91			: basic_ios<_CharT, _Traits>(), basic_istream<_CharT, _Traits>(0),
92			internalBuf_(NULL), isRead(false) {
93
94			#ifdef IS_MPI
95			//in parallel mode, fall back to istringstream
96			basic_stringbuf<_CharT, _Traits, _Alloc>* stringBuffer = new basic_stringbuf<_CharT, _Traits, _Alloc>();
97			internalBuf_ = stringBuffer;
98			#else
99			//in single version, fall back to ifstream
100			basic_filebuf<_CharT, _Traits>* fileBuffer = new basic_filebuf<_CharT, _Traits>();
101			internalBuf_ = fileBuffer;
102			#endif
103
104			this->init(internalBuf_);
105			isRead = false;
106			}
107
108			/**
109			* Explicit constructor
110			* @filename String containing the name of the file to be opened
111	tim	1572	* @mode Flags describing the requested i/o mode for the file, default value is ios_base::in
112			* @checkFilename Flags indicating checking the file name in parallel
113	tim	1570	*/
114	tim	1572	explicit basic_ifstrstream(const char* filename, ios_base::openmode mode = ios_base::in, bool checkFilename = false)
115	tim	1570	: basic_ios<_CharT, _Traits>(), basic_istream<_CharT, _Traits>(0),
116			internalBuf_(NULL), isRead(false) {
117
118	tim	1572	isRead = internalOpen(filename, mode \| ios_base::in, checkFilename);
119	tim	1570	}
120
121			/**
122	tim	1577	* virtual destructor will close the file(in single mode) and clear the stream buffer
123	tim	1570	*/
124			~basic_ifstrstream(){
125			close();
126			delete internalBuf_;
127			internalBuf_ = NULL;
128			}
129
130			/**
131			* Opens a file and associats a buffer with the specified file to perform the i/o operations
132			* (single mode). Master reads a file and brocasts its content to the other slave nodes. After
133			* brocasting, every nodes fall back to stringstream (parallel mode).
134			* @filename String containing the name of the file to be opened
135			* @mode Flags describing the requested i/o mode for the file
136	tim	1572	* @checkFilename Flags indicating checking the file name in parallel
137	tim	1570	*/
138	tim	1572	void open(const char* filename, ios_base::openmode mode = ios_base::in, bool checkFilename = false){
139	tim	1570
140			if (!isRead ) {
141	tim	1572	isRead = internalOpen(filename, mode, checkFilename);
142	tim	1570	}
143			}
144
145			/**
146			* Tests if the stream is currently associated with a valid buffer.
147			* @return true if a file has successfully been opened (single mode) or the whole file is read
148			* and spreaded among all of the processors (parallel mode), otherwise false is returned
149			*/
150			bool is_open ( ) {
151			#ifdef IS_MPI
152			return isRead;
153			#else
154			//single version fall back to ifstream
155			return this->rdbuf()->is_open();
156			#endif
157			}
158
159			/**
160			* In single mode, closes a file. The stream's file buffer is released from its association with
161			* the currently open file. In parallel mode, clean the
162			*/
163			void close() {
164			#ifndef IS_MPI
165			//single version fall back to ifstream
166			if (!this->rdbuf()->close())
167			this->setstate(ios_base::failbit);
168			#endif
169
170			isRead = false;
171			}
172
173			/**
174			* Gets the stream buffer object associated with the stream
175			* @return A pointer to the stream buffe object(filebuf in single mode, stringbuf in
176			* parallel mode) associated with the stream.
177			*/
178			_Buf* rdbuf() const{
179	tim	1582	return static_cast<_Buf*>(internalBuf_);
180	tim	1570	}
181
182			private:
183
184			/**
185			* Internal function used to open the file
186			* @return true if succesfully opens a file (single mode) or gets the file content (parallel mode)
187			* otherwise return false
188			* @filename String containing the name of the file to be opened
189			* @mode Flags describing the requested i/o mode for the file
190			* @todo use try - catch syntax to make the program more readable
191			*/
192	tim	1572	bool internalOpen(const char* filename, ios_base::openmode mode, bool checkFilename){
193	tim	1570
194			#ifdef IS_MPI
195			int commStatus;
196			long fileSize;
197			char* fbuf;
198			int filenameLen;
199			int diffFilename;
200			int error;
201	tim	1572	int myRank;
202			int masterNode;
203	tim	1570
204	tim	1572	commStatus = MPI_Comm_rank(MPI_COMM_WORLD, &myRank);
205			masterNode = 0;
206
207			if (myRank == masterNode) {
208	tim	1570
209	tim	1572	if (checkFilename) {
210	tim	1570
211	tim	1572	//check the filename is the same
212			filenameLen = strlen(filename);
213	tim	1583	commStatus = MPI_Bcast(&filenameLen, 1, MPI_INT, masterNode, MPI_COMM_WORLD);
214			commStatus = MPI_Bcast((void*)filename, filenameLen, MPI_CHAR, masterNode, MPI_COMM_WORLD);
215	tim	1570
216	tim	1572	diffFilename = 0;
217	tim	1583	commStatus = MPI_Allreduce(&diffFilename, &error, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
218	tim	1572
219			//if file names are different just return false
220			if (error > 0)
221	tim	1570	return false;
222	tim	1572	}
223	tim	1570
224	tim	1572	ifstream fin(filename, mode);
225	tim	1570	basic_stringbuf<_CharT, _Traits, _Alloc>* sbuf;
226
227			if (fin.is_open()) {
228
229	tim	1583	fin.seekg(0, ios::end);
230	tim	1570	fileSize = fin.tellg();
231	tim	1583	fin.seekg(0, ios::beg);
232
233	tim	1570	// '\0' need one more char
234			fbuf = new char[fileSize+1];
235
236			assert(fbuf != 0);
237
238			fin.read(fbuf, fileSize);
239
240			if (fin.fail())
241			fileSize = FileIOError;
242
243			//brocasting the file size
244			commStatus = MPI_Bcast(&fileSize, 1, MPI_LONG, masterNode, MPI_COMM_WORLD);
245
246			if (fileSize < 0) {
247			fin.close();
248			delete fbuf;
249
250			return false;
251			}
252
253			// make a c-style string and brocasting it
254			fbuf[fileSize] = '\0';
255			commStatus = MPI_Bcast(fbuf, fileSize + 1, MPI_CHAR, masterNode, MPI_COMM_WORLD);
256
257			//it is safe to delete null pointer
258			delete internalBuf_;
259
260			//initilaize istream
261			internalBuf_ = new basic_stringbuf<_CharT, _Traits, _Alloc>(fbuf, mode);
262			assert(internalBuf_);
263			this->init(internalBuf_);
264
265			//close the file and delete the buffer
266			fin.close();
267			delete fbuf;
268			}else{
269			fileSize = FileNoExists;
270			commStatus = MPI_Bcast(&fileSize, 1, MPI_LONG, masterNode, MPI_COMM_WORLD);
271			return false;
272			}
273
274			} else{
275			//check file name
276	tim	1572	if (checkFilename) {
277	tim	1583	commStatus = MPI_Bcast(&filenameLen, 1, MPI_INT, masterNode, MPI_COMM_WORLD);
278	tim	1570
279	tim	1572	char * masterFilename = new char[filenameLen];
280			commStatus = MPI_Bcast(masterFilename, filenameLen, MPI_CHAR, masterNode, MPI_COMM_WORLD);
281
282			if( strcmp(masterFilename, filename) == 0)
283			diffFilename = 0;
284			else
285			diffFilename = 1;
286	tim	1570
287	tim	1572	delete masterFilename;
288
289	tim	1583	commStatus = MPI_Allreduce(&diffFilename, &error, 1, MPI_INT, MPI_SUM, MPI_COMM_WORLD);
290	tim	1570
291	tim	1572	if (error > 0)
292			return false;
293			}
294	tim	1570	//get file size
295			commStatus = MPI_Bcast(&fileSize, 1, MPI_LONG, masterNode, MPI_COMM_WORLD);
296
297			if (fileSize >= 0 ) {
298			fbuf = new char[fileSize+1];
299			assert(fbuf);
300
301			//receive file content
302			commStatus = MPI_Bcast(fbuf, fileSize + 1, MPI_CHAR, masterNode, MPI_COMM_WORLD);
303
304			//it is safe to delete null pointer
305			delete internalBuf_;
306
307			//initilaize istream
308			internalBuf_ = new basic_stringbuf<_CharT, _Traits, _Alloc>(fbuf, mode);
309			assert(internalBuf_);
310			this->init(internalBuf_);
311
312			delete fbuf;
313
314			} else if (fileSize == FileNoExists ) {
315			return false;
316
317			} else if (fileSize == FileIOError ) {
318			return false;
319			}
320			}
321
322			#else
323			//in single version, fall back to ifstream
324			basic_filebuf<_CharT, _Traits>* fileBuffer = new basic_filebuf<_CharT, _Traits>();
325
326			this->init(fileBuffer);
327			if (!fileBuffer->open(filename, mode))
328			this->setstate(ios_base::failbit);
329
330			//it is safe to delete null pointer
331			delete internalBuf_;
332
333			internalBuf_ = fileBuffer;
334			#endif
335
336			return true;
337			}
338
339			basic_streambuf<_CharT, _Traits>* internalBuf_; /** internal stream buffer */
340			bool isRead; /** file opened flag */
341			};
342
343	tim	1581	typedef basic_ifstrstream<char, char_traits<char>, allocator<char> > ifstrstream;
344	tim	1570	}//namespace oopse
345			#endif //IO_IFSTRSTREAM_HPP