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FileBlockIO Class Reference

??? More...

#include <blockio.h>

Inheritance diagram for FileBlockIO:

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Collaboration diagram for FileBlockIO:

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List of all members.

Public Member Functions

 FileBlockIO (int blocksize=4096)
virtual OpenStatus open (const char *filename="enf.enf")
 ???

virtual bool const  is_open ()
virtual void close ()
 ???

virtual bool get (void *buf, int buflen, BlockNum blockno)
 ???

virtual bool put (void *buf, int buflen, BlockNum blockno)
 ???


Public Attributes

int blockfd

Detailed Description

???

???

Definition at line 97 of file blockio.h.

Constructor & Destructor Documentation

FileBlockIO::FileBlockIO (  int  blocksize = 4096  )  [inline]
 

Definition at line 104 of file blockio.h.

References blockfd, and BlockIO::blocksize. 

00105     : BlockIO(blocksize), blockfd(-1) { }

Member Function Documentation

void FileBlockIO::close (   )  [virtual]
 

???

(to be defined)

Implements BlockIO.

Definition at line 93 of file blockio.cxx.

References assert, and blockfd. 

00094 {
00095     if (::close(blockfd) != 0) {
00096         perror("FileBlockIO::close");
00097         assert(0); // close failed
00098     }
00099 }

bool FileBlockIO::get (  void *  buf,
int  buflen,
BlockNum  blockno
)  [virtual]
 

???

(to be defined)

Implements BlockIO.

Definition at line 109 of file blockio.cxx.

References assert, blockfd, BlockNum, BlockIO::stats::blocks_read, BlockIO::blocksize, goodblock(), L, NULL, and BlockIO::stats. 

00113 {
00114     L("FileBlockIO::get(buf=0x%08lX, buflen=%d, blockno=%d) blocksize=%d\n", buf, buflen, blockno, blocksize);
00115     assert(buf != NULL);
00116     assert(blockno != 0);
00117     assert( goodblock(blockno) );
00118 //    assert(buflen <= blocksize);
00119 
00120 //OBSOLETE    if (!enffileread) {
00121 //OBSOLETE        if (close(enffiledes) != 0)
00122 //OBSOLETE            perror("close failed in readloaf");
00123 //OBSOLETE
00124 //OBSOLETE        if ((enffiledes = open("enf.enf",  O_RDWR, 0)) == -1) {
00125 //OBSOLETE            perror("open");
00126 //OBSOLETE            assert(0); // open
00127 //OBSOLETE        }
00128 //OBSOLETE        enffileread = true;
00129 //OBSOLETE    }
00130 
00131     if (lseek(blockfd, (long) blockno * blocksize, 0) < 0) {
00132         perror("FileBlockIO::get");
00133         return false;
00134     }
00135 
00136     int nbytes = read(blockfd, buf, buflen);
00137     assert(nbytes > 0); // Incorrect Usage of Assertion
00138 
00139     stats.blocks_read++;
00140     return true;
00141 }

virtual bool const FileBlockIO::is_open (   )  [inline, virtual]
 

Implements BlockIO.

Definition at line 109 of file blockio.h.

References blockfd. 

00109 { return blockfd >= 0; }

FileBlockIO::OpenStatus FileBlockIO::open (  const char *  filename = "enf.enf"  )  [virtual]
 

???

(to be defined)

Implements BlockIO.

Definition at line 65 of file blockio.cxx.

References blockfd, errno, BlockIO::OS_CREATED, BlockIO::OS_FAILED, and BlockIO::OS_OPENED. 

00067 {
00068     // Try to Open an Existing File
00069     blockfd = ::open(filename, O_RDWR, 0);
00070     if (blockfd >= 0)
00071         return OS_OPENED; // Existing Media was Found and Opened
00072 
00073     errno = 0;
00074 
00075     // Else Try to Create a New File
00076     blockfd = creat(filename, 0660);
00077     if (blockfd >= 0)
00078         return OS_CREATED; // No Media Found so a New One was Created
00079 
00080     // Error: Unable to Open or Create the File
00081     perror("FileBlockIO::open");
00082     return OS_FAILED;
00083 }

bool FileBlockIO::put (  void *  buf,
int  buflen,
BlockNum  blockno
)  [virtual]
 

???

(to be defined)

Implements BlockIO.

Definition at line 151 of file blockio.cxx.

References assert, blockfd, BlockNum, BlockIO::stats::blocks_written, BlockIO::blocksize, goodblock(), L, NULL, and BlockIO::stats. 

00155 {
00156     L("FileBlockIO::put(buf=0x%08lX, buflen=%d, blockno=%d) blocksize=%d\n", buf, buflen, blockno, blocksize);
00157     assert(buf != NULL);
00158     assert(blockno != 0);
00159     assert( goodblock(blockno) );
00160     assert(buflen <= blocksize);
00161 
00162     if (lseek(blockfd, (long) blockno * blocksize, 0) < 0) {
00163         perror("FileBlockIO::put");
00164         return false;
00165     }
00166 
00167     int nbytes = write(blockfd, buf, buflen);
00168     assert(nbytes >= 0); // Incorrect Usage of Assert
00169 
00170     stats.blocks_written++;
00171     return true;
00172 }

Member Data Documentation

int FileBlockIO::blockfd
 

Definition at line 102 of file blockio.h.

Referenced by close(), FileBlockIO(), get(), is_open(), open(), and put().

The documentation for this class was generated from the following files:
Generated on Sun Aug 21 04:18:49 2005 for Udanax-Green by doxygen1.3.4