mirror of https://github.com/vitalif/grive2
289 lines
5.5 KiB
C++
289 lines
5.5 KiB
C++
/*
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grive: an GPL program to sync a local directory with Google Drive
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Copyright (C) 2012 Wan Wai Ho
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation version 2
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of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#include "File.hh"
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#include <cassert>
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// boost headers
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#include <boost/throw_exception.hpp>
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#include <boost/exception/errinfo_api_function.hpp>
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#include <boost/exception/errinfo_errno.hpp>
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#include <boost/exception/errinfo_file_name.hpp>
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#include <boost/exception/errinfo_file_open_mode.hpp>
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#include <boost/exception/info.hpp>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <fcntl.h>
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#if defined(__FreeBSD__) || defined(__OpenBSD__)
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#include <unistd.h>
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#endif
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#ifdef WIN32
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#include <io.h>
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typedef int ssize_t ;
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#else
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#include <sys/mman.h>
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#endif
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// local functions
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namespace {
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using namespace gr ;
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off_t LSeek( int fd, off_t offset, int whence )
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{
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assert( fd >= 0 ) ;
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off_t r = ::lseek( fd, offset, whence ) ;
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if ( r == static_cast<off_t>(-1) )
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{
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BOOST_THROW_EXCEPTION(
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File::Error()
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<< boost::errinfo_api_function("lseek")
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<< boost::errinfo_errno(errno)
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) ;
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}
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return r ;
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}
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struct stat FStat( int fd )
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{
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struct stat s = {} ;
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if ( ::fstat( fd, &s ) != 0 )
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{
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BOOST_THROW_EXCEPTION(
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File::Error()
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<< boost::errinfo_api_function("fstat")
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<< boost::errinfo_errno(errno)
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) ;
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}
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return s ;
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}
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} // end of local functions
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namespace gr {
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File::File( ) : m_fd( -1 )
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{
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}
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/** Opens the file for reading.
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\param path Path to the file to be opened.
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\throw Error When the file cannot be openned.
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*/
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File::File( const fs::path& path ) : m_fd( -1 )
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{
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OpenForRead( path ) ;
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}
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/** Opens the file for writing.
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\param path Path to the file to be opened.
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\param mode Mode of the file to be created, e.g. 0600 for user
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readable/writable.
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\throw Error When the file cannot be opened.
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*/
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File::File( const fs::path& path, int mode ) : m_fd( -1 )
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{
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OpenForWrite( path, mode ) ;
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}
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/** The destructor will close the file.
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*/
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File::~File( )
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{
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Close() ;
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}
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void File::Open( const fs::path& path, int flags, int mode )
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{
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if ( IsOpened() )
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Close() ;
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assert( m_fd == -1 ) ;
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m_fd = ::open( path.string().c_str(), flags, mode ) ;
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if ( m_fd == -1 )
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{
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BOOST_THROW_EXCEPTION(
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Error()
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<< boost::errinfo_api_function("open")
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<< boost::errinfo_errno(errno)
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<< boost::errinfo_file_name(path.string())
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) ;
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}
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}
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void File::OpenForRead( const fs::path& path )
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{
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int flags = O_RDONLY ;
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#ifdef WIN32
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flags |= O_BINARY ;
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#endif
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Open( path, flags, 0 ) ;
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}
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void File::OpenForWrite( const fs::path& path, int mode )
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{
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int flags = O_CREAT|O_RDWR|O_TRUNC ;
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#ifdef WIN32
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flags |= O_BINARY ;
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#endif
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Open( path, flags, mode ) ;
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}
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void File::Close()
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{
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if ( IsOpened() )
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{
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close( m_fd ) ;
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m_fd = -1 ;
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}
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}
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bool File::IsOpened() const
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{
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return m_fd != -1 ;
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}
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/** Read bytes from file. See DataStream::Read() for details.
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\throw Error In case of any error.
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*/
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std::size_t File::Read( char *ptr, std::size_t size )
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{
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assert( IsOpened() ) ;
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ssize_t count = ::read( m_fd, ptr, size ) ;
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if ( count == -1 )
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{
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BOOST_THROW_EXCEPTION(
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Error()
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<< boost::errinfo_api_function("read")
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<< boost::errinfo_errno(errno)
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) ;
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}
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return count ;
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}
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std::size_t File::Write( const char *ptr, std::size_t size )
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{
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assert( IsOpened() ) ;
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ssize_t count = ::write( m_fd, ptr, size ) ;
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if ( count == -1 )
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{
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BOOST_THROW_EXCEPTION(
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Error()
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<< boost::errinfo_api_function("write")
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<< boost::errinfo_errno(errno)
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) ;
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}
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return count ;
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}
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off_t File::Seek( off_t offset, int whence )
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{
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assert( IsOpened() ) ;
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return LSeek( m_fd, offset, whence ) ;
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}
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off_t File::Tell() const
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{
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assert( IsOpened() ) ;
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return LSeek( m_fd, 0, SEEK_CUR ) ;
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}
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u64_t File::Size() const
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{
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assert( IsOpened() ) ;
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struct stat s = FStat(m_fd) ;
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assert( s.st_size >= 0 ) ;
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return static_cast<uint64_t>( s.st_size ) ;
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}
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void File::Chmod( int mode )
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{
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assert( IsOpened() ) ;
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#ifndef WIN32
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if ( ::fchmod( m_fd, mode ) != 0 )
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{
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BOOST_THROW_EXCEPTION(
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Error()
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<< boost::errinfo_api_function("fchmod")
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<< boost::errinfo_errno(errno)
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) ;
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}
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#endif
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}
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/// This function is not implemented in win32 yet.
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void* File::Map( off_t offset, std::size_t length )
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{
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assert( IsOpened() ) ;
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#ifdef WIN32
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assert( false ) ;
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return 0 ;
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#else
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void *addr = ::mmap( 0, length, PROT_READ, MAP_PRIVATE, m_fd, offset ) ;
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if ( addr == reinterpret_cast<void*>( -1 ) )
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{
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BOOST_THROW_EXCEPTION(
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Error()
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<< boost::errinfo_api_function("mmap")
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<< boost::errinfo_errno(errno)
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) ;
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}
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return addr ;
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#endif
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}
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void File::UnMap( void *addr, std::size_t length )
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{
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#ifndef WIN32
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if ( ::munmap( addr, length ) != 0 )
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{
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BOOST_THROW_EXCEPTION(
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Error()
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<< boost::errinfo_api_function("munmap")
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<< boost::errinfo_errno(errno)
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) ;
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}
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#endif
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}
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struct stat File::Stat() const
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{
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struct stat result = {} ;
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if ( ::fstat( m_fd, &result ) != 0 )
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{
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BOOST_THROW_EXCEPTION(
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Error()
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<< boost::errinfo_api_function("fstat")
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<< boost::errinfo_errno(errno)
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) ;
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}
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return result ;
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}
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} // end of namespace
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