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/*
* Copyright (C) 2007-2010 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#include "bu/file.h"
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <time.h>
#include "bu/config.h"
namespace Bu { subExceptionDef( FileException ) }
Bu::File::File( const Bu::FString &sName, int iFlags ) :
fd( -1 ),
bEos( true )
{
#ifdef USE_64BIT_IO
fd = ::open64( sName.getStr(), getPosixFlags( iFlags ), 0666 );
#else
fd = ::open( sName.getStr(), getPosixFlags( iFlags ), 0666 );
#endif
if( fd < 0 )
{
throw Bu::FileException( errno, "%s: %s",
strerror(errno), sName.getStr() );
}
bEos = false;
}
Bu::File::File( int fd ) :
fd( fd )
{
bEos = false;
}
Bu::File::~File()
{
close();
}
void Bu::File::close()
{
if( fd >= 0 )
{
if( ::close( fd ) )
{
throw Bu::FileException( errno, "%s",
strerror(errno) );
}
fd = -1;
bEos = true;
}
}
size_t Bu::File::read( void *pBuf, size_t nBytes )
{
if( fd < 0 )
throw FileException("File not open.");
ssize_t iRead = ::read( fd, pBuf, nBytes );
if( iRead == 0 )
bEos = true;
else if( iRead == -1 && errno == EAGAIN )
return 0;
else if( iRead < 0 )
throw FileException( errno, "%s", strerror( errno ) );
return iRead;
}
size_t Bu::File::write( const void *pBuf, size_t nBytes )
{
if( fd < 0 )
throw FileException("File not open.");
ssize_t iWrote = ::write( fd, pBuf, nBytes );
if( iWrote < 0 )
throw FileException( errno, "%s", strerror( errno ) );
return iWrote;
}
long Bu::File::tell()
{
if( fd < 0 )
throw FileException("File not open.");
return lseek( fd, 0, SEEK_CUR );
}
void Bu::File::seek( long offset )
{
if( fd < 0 )
throw FileException("File not open.");
lseek( fd, offset, SEEK_CUR );
bEos = false;
}
void Bu::File::setPos( long pos )
{
if( fd < 0 )
throw FileException("File not open.");
lseek( fd, pos, SEEK_SET );
bEos = false;
}
void Bu::File::setPosEnd( long pos )
{
if( fd < 0 )
throw FileException("File not open.");
lseek( fd, pos, SEEK_END );
bEos = false;
}
bool Bu::File::isEos()
{
return bEos;
}
bool Bu::File::canRead()
{
#ifdef WIN32
return true;
#else
int iMode = fcntl( fd, F_GETFL, 0 )&O_ACCMODE;
if( iMode == O_RDONLY || iMode == O_RDWR )
return true;
return false;
#endif
}
bool Bu::File::canWrite()
{
#ifdef WIN32
return true;
#else
int iMode = fcntl( fd, F_GETFL, 0 )&O_ACCMODE;
if( iMode == O_WRONLY || iMode == O_RDWR )
return true;
return false;
#endif
}
bool Bu::File::isReadable()
{
return true;
}
bool Bu::File::isWritable()
{
return true;
}
bool Bu::File::isSeekable()
{
return true;
}
bool Bu::File::isBlocking()
{
return true;
}
void Bu::File::setBlocking( bool bBlocking )
{
#ifdef WIN32
fprintf(stderr, "STUB: Bu::File::setBlocking\n");
#else
if( bBlocking )
fcntl(
fd,
F_SETFL, fcntl( fd, F_GETFL, 0 )&(~O_NONBLOCK)
);
else
fcntl(
fd,
F_SETFL, fcntl( fd, F_GETFL, 0 )|O_NONBLOCK
);
#endif
}
Bu::File Bu::File::tempFile( Bu::FString &sName )
{
uint32_t iX;
iX = time( NULL ) + getpid();
int iXes;
for( iXes = sName.getSize()-1; iXes >= 0; iXes-- )
{
if( sName[iXes] != 'X' )
break;
}
iXes++;
if( iXes == sName.getSize() )
throw Bu::ExceptionBase("Invalid temporary filename template.");
for( int iter = 0; iter < 100; iter++ )
{
for( int j = iXes; j < sName.getSize(); j++ )
{
iX = (1103515245 * iX + 12345);
sName[j] = ('A'+(iX%26)) | ((iX&0x1000)?(0x20):(0));
}
try
{
return Bu::File( sName, Bu::File::Read|Bu::File::Write
|Bu::File::Create|Bu::File::Exclusive );
} catch(...) { }
}
throw Bu::FileException("Failed to create unique temporary file after 100"
" iterations.");
}
void Bu::File::setSize( long iSize )
{
#ifdef WIN32
chsize( fd, iSize );
#else
ftruncate( fd, iSize );
#endif
}
#ifndef WIN32
void Bu::File::chmod( mode_t t )
{
fchmod( fd, t );
}
#endif
void Bu::File::flush()
{
// There is no flushing with direct I/O...
//fflush( fh );
}
bool Bu::File::isOpen()
{
return (fd > -1);
}
int Bu::File::getPosixFlags( int iFlags )
{
int iRet = 0;
switch( (iFlags&ReadWrite) )
{
// According to posix, O_RDWR is not necesarilly O_RDONLY|O_WRONLY, so
// lets be proper and use the right value in the right place.
case Read: iRet = O_RDONLY; break;
case Write: iRet = O_WRONLY; break;
case ReadWrite: iRet = O_RDWR; break;
default:
throw FileException(
"You must specify Read, Write, or both when opening a file.");
}
if( (iFlags&Create) )
iRet |= O_CREAT;
if( (iFlags&Append) )
iRet |= O_APPEND;
if( (iFlags&Truncate) )
iRet |= O_TRUNC;
#ifndef WIN32
if( (iFlags&NonBlock) )
iRet |= O_NONBLOCK;
#endif
if( (iFlags&Exclusive) == Exclusive )
iRet |= O_EXCL;
#ifdef O_BINARY
iRet |= O_BINARY;
#endif
return iRet;
}
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