mirror of
https://github.com/xiaoyifang/goldendict-ng.git
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133 lines
2.3 KiB
C++
133 lines
2.3 KiB
C++
/* This file is (c) 2017 Abs62
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* Part of GoldenDict. Licensed under GPLv3 or later, see the LICENSE file */
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#include "splitfile.hh"
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#include "fsencoding.hh"
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namespace SplitFile
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{
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SplitFile::SplitFile() :
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currentFile( 0 )
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{
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}
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SplitFile::~SplitFile()
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{
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close();
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}
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void SplitFile::appendFile( const QString & name )
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{
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if( offsets.isEmpty() )
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offsets.append( 0 );
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else
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offsets.append( offsets.last() + files.last()->size() );
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files.append( new QFile( name ) );
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}
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void SplitFile::close()
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{
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for( QVector< QFile * >::const_iterator i = files.begin(); i != files.end(); ++i )
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{
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(*i)->close();
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delete (*i);
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}
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files.clear();
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offsets.clear();
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currentFile = 0;
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}
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void SplitFile::getFilenames( vector< string > &names ) const
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{
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for( QVector< QFile * >::const_iterator i = files.begin(); i != files.end(); ++i )
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names.push_back( FsEncoding::encode( (*i)->fileName() ) );
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}
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bool SplitFile::open( QFile::OpenMode mode )
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{
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for( QVector< QFile * >::iterator i = files.begin(); i != files.end(); ++i )
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if( !(*i)->open( mode ) )
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{
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close();
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return false;
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}
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return true;
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}
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bool SplitFile::seek( quint64 pos )
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{
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if( offsets.isEmpty() )
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return false;
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int fileNom;
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for( fileNom = 0; fileNom < offsets.size() - 1; fileNom++ )
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if( pos < offsets.at( fileNom + 1 ) )
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break;
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pos -= offsets.at( fileNom );
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currentFile = fileNom;
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return files.at( fileNom )->seek( pos );
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}
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qint64 SplitFile::read( char *data, qint64 maxSize )
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{
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if( offsets.isEmpty() )
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return 0;
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quint64 bytesReaded = 0;
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for( int i = currentFile; i < files.size(); i++ )
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{
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if( i != currentFile )
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{
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files.at( i )->seek( 0 );
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currentFile = i;
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}
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qint64 ret = files.at( i )->read( data + bytesReaded, maxSize );
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if( ret < 0 )
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break;
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bytesReaded += ret;
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maxSize -= ret;
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if( maxSize <= 0 )
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break;
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}
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return bytesReaded;
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}
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QByteArray SplitFile::read( qint64 maxSize )
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{
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QByteArray data;
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data.resize( maxSize );
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qint64 ret = read( data.data(), maxSize );
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if( ret != maxSize )
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data.resize( ret );
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return data;
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}
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bool SplitFile::getChar( char *c )
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{
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char ch;
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return read( c ? c : &ch, 1 ) == 1;
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}
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qint64 SplitFile::pos() const
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{
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if( offsets.isEmpty() )
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return 0;
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return offsets.at( currentFile ) + files.at( currentFile )->pos();
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}
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} // namespace SplitFile
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