mirror of
https://github.com/SquidDev-CC/CC-Tweaked
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420 lines
12 KiB
Java
420 lines
12 KiB
Java
/*
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* This file is part of ComputerCraft - http://www.computercraft.info
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* Copyright Daniel Ratcliffe, 2011-2021. Do not distribute without permission.
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* Send enquiries to dratcliffe@gmail.com
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*/
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package dan200.computercraft.core.filesystem;
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import com.google.common.collect.Sets;
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import dan200.computercraft.ComputerCraft;
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import dan200.computercraft.api.filesystem.FileOperationException;
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import dan200.computercraft.api.filesystem.IWritableMount;
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import javax.annotation.Nonnull;
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import java.io.File;
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import java.io.IOException;
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import java.nio.ByteBuffer;
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import java.nio.channels.*;
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import java.nio.file.*;
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import java.nio.file.attribute.BasicFileAttributes;
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import java.util.Collections;
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import java.util.List;
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import java.util.OptionalLong;
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import java.util.Set;
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public class FileMount implements IWritableMount
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{
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private static final int MINIMUM_FILE_SIZE = 500;
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private static final Set<OpenOption> READ_OPTIONS = Collections.singleton( StandardOpenOption.READ );
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private static final Set<OpenOption> WRITE_OPTIONS = Sets.newHashSet( StandardOpenOption.WRITE, StandardOpenOption.CREATE, StandardOpenOption.TRUNCATE_EXISTING );
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private static final Set<OpenOption> APPEND_OPTIONS = Sets.newHashSet( StandardOpenOption.WRITE, StandardOpenOption.CREATE, StandardOpenOption.APPEND );
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private class WritableCountingChannel implements WritableByteChannel
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{
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private final WritableByteChannel inner;
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long ignoredBytesLeft;
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WritableCountingChannel( WritableByteChannel inner, long bytesToIgnore )
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{
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this.inner = inner;
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ignoredBytesLeft = bytesToIgnore;
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}
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@Override
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public int write( @Nonnull ByteBuffer b ) throws IOException
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{
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count( b.remaining() );
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return inner.write( b );
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}
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void count( long n ) throws IOException
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{
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ignoredBytesLeft -= n;
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if( ignoredBytesLeft < 0 )
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{
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long newBytes = -ignoredBytesLeft;
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ignoredBytesLeft = 0;
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long bytesLeft = capacity - usedSpace;
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if( newBytes > bytesLeft ) throw new IOException( "Out of space" );
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usedSpace += newBytes;
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}
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}
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@Override
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public boolean isOpen()
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{
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return inner.isOpen();
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}
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@Override
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public void close() throws IOException
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{
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inner.close();
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}
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}
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private class SeekableCountingChannel extends WritableCountingChannel implements SeekableByteChannel
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{
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private final SeekableByteChannel inner;
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SeekableCountingChannel( SeekableByteChannel inner, long bytesToIgnore )
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{
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super( inner, bytesToIgnore );
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this.inner = inner;
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}
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@Override
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public SeekableByteChannel position( long newPosition ) throws IOException
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{
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if( !isOpen() ) throw new ClosedChannelException();
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if( newPosition < 0 )
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{
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throw new IllegalArgumentException( "Cannot seek before the beginning of the stream" );
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}
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long delta = newPosition - inner.position();
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if( delta < 0 )
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{
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ignoredBytesLeft -= delta;
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}
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else
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{
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count( delta );
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}
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return inner.position( newPosition );
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}
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@Override
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public SeekableByteChannel truncate( long size ) throws IOException
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{
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throw new IOException( "Not yet implemented" );
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}
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@Override
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public int read( ByteBuffer dst ) throws ClosedChannelException
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{
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if( !inner.isOpen() ) throw new ClosedChannelException();
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throw new NonReadableChannelException();
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}
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@Override
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public long position() throws IOException
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{
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return inner.position();
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}
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@Override
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public long size() throws IOException
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{
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return inner.size();
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}
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}
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private final File rootPath;
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private final long capacity;
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private long usedSpace;
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public FileMount( File rootPath, long capacity )
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{
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this.rootPath = rootPath;
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this.capacity = capacity + MINIMUM_FILE_SIZE;
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usedSpace = created() ? measureUsedSpace( this.rootPath ) : MINIMUM_FILE_SIZE;
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}
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// IMount implementation
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@Override
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public boolean exists( @Nonnull String path )
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{
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if( !created() ) return path.isEmpty();
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File file = getRealPath( path );
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return file.exists();
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}
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@Override
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public boolean isDirectory( @Nonnull String path )
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{
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if( !created() ) return path.isEmpty();
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File file = getRealPath( path );
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return file.exists() && file.isDirectory();
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}
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@Override
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public void list( @Nonnull String path, @Nonnull List<String> contents ) throws IOException
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{
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if( !created() )
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{
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if( !path.isEmpty() ) throw new FileOperationException( path, "Not a directory" );
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return;
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}
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File file = getRealPath( path );
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if( !file.exists() || !file.isDirectory() ) throw new FileOperationException( path, "Not a directory" );
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String[] paths = file.list();
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for( String subPath : paths )
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{
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if( new File( file, subPath ).exists() ) contents.add( subPath );
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}
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}
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@Override
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public long getSize( @Nonnull String path ) throws IOException
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{
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if( !created() )
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{
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if( path.isEmpty() ) return 0;
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}
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else
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{
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File file = getRealPath( path );
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if( file.exists() ) return file.isDirectory() ? 0 : file.length();
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}
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throw new FileOperationException( path, "No such file" );
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}
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@Nonnull
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@Override
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public ReadableByteChannel openForRead( @Nonnull String path ) throws IOException
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{
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if( created() )
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{
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File file = getRealPath( path );
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if( file.exists() && !file.isDirectory() ) return FileChannel.open( file.toPath(), READ_OPTIONS );
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}
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throw new FileOperationException( path, "No such file" );
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}
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@Nonnull
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@Override
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public BasicFileAttributes getAttributes( @Nonnull String path ) throws IOException
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{
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if( created() )
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{
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File file = getRealPath( path );
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if( file.exists() ) return Files.readAttributes( file.toPath(), BasicFileAttributes.class );
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}
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throw new FileOperationException( path, "No such file" );
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}
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// IWritableMount implementation
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@Override
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public void makeDirectory( @Nonnull String path ) throws IOException
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{
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create();
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File file = getRealPath( path );
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if( file.exists() )
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{
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if( !file.isDirectory() ) throw new FileOperationException( path, "File exists" );
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return;
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}
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int dirsToCreate = 1;
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File parent = file.getParentFile();
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while( !parent.exists() )
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{
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++dirsToCreate;
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parent = parent.getParentFile();
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}
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if( getRemainingSpace() < dirsToCreate * MINIMUM_FILE_SIZE )
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{
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throw new FileOperationException( path, "Out of space" );
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}
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if( file.mkdirs() )
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{
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usedSpace += dirsToCreate * MINIMUM_FILE_SIZE;
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}
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else
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{
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throw new FileOperationException( path, "Access denied" );
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}
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}
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@Override
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public void delete( @Nonnull String path ) throws IOException
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{
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if( path.isEmpty() ) throw new FileOperationException( path, "Access denied" );
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if( created() )
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{
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File file = getRealPath( path );
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if( file.exists() ) deleteRecursively( file );
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}
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}
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private void deleteRecursively( File file ) throws IOException
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{
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// Empty directories first
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if( file.isDirectory() )
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{
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String[] children = file.list();
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for( String aChildren : children )
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{
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deleteRecursively( new File( file, aChildren ) );
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}
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}
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// Then delete
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long fileSize = file.isDirectory() ? 0 : file.length();
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boolean success = file.delete();
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if( success )
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{
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usedSpace -= Math.max( MINIMUM_FILE_SIZE, fileSize );
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}
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else
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{
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throw new IOException( "Access denied" );
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}
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}
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@Nonnull
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@Override
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public WritableByteChannel openForWrite( @Nonnull String path ) throws IOException
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{
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create();
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File file = getRealPath( path );
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if( file.exists() && file.isDirectory() ) throw new FileOperationException( path, "Cannot write to directory" );
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if( file.exists() )
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{
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usedSpace -= Math.max( file.length(), MINIMUM_FILE_SIZE );
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}
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else if( getRemainingSpace() < MINIMUM_FILE_SIZE )
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{
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throw new FileOperationException( path, "Out of space" );
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}
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usedSpace += MINIMUM_FILE_SIZE;
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return new SeekableCountingChannel( Files.newByteChannel( file.toPath(), WRITE_OPTIONS ), MINIMUM_FILE_SIZE );
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}
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@Nonnull
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@Override
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public WritableByteChannel openForAppend( @Nonnull String path ) throws IOException
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{
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if( !created() )
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{
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throw new FileOperationException( path, "No such file" );
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}
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File file = getRealPath( path );
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if( !file.exists() ) throw new FileOperationException( path, "No such file" );
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if( file.isDirectory() ) throw new FileOperationException( path, "Cannot write to directory" );
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// Allowing seeking when appending is not recommended, so we use a separate channel.
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return new WritableCountingChannel(
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Files.newByteChannel( file.toPath(), APPEND_OPTIONS ),
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Math.max( MINIMUM_FILE_SIZE - file.length(), 0 )
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);
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}
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@Override
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public long getRemainingSpace()
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{
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return Math.max( capacity - usedSpace, 0 );
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}
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@Nonnull
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@Override
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public OptionalLong getCapacity()
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{
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return OptionalLong.of( capacity - MINIMUM_FILE_SIZE );
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}
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private File getRealPath( String path )
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{
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return new File( rootPath, path );
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}
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private boolean created()
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{
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return rootPath.exists();
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}
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private void create() throws IOException
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{
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if( !rootPath.exists() )
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{
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boolean success = rootPath.mkdirs();
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if( !success )
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{
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throw new IOException( "Access denied" );
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}
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}
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}
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private static class Visitor extends SimpleFileVisitor<Path>
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{
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long size;
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@Override
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public FileVisitResult preVisitDirectory( Path dir, BasicFileAttributes attrs )
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{
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size += MINIMUM_FILE_SIZE;
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return FileVisitResult.CONTINUE;
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}
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@Override
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public FileVisitResult visitFile( Path file, BasicFileAttributes attrs )
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{
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size += Math.max( attrs.size(), MINIMUM_FILE_SIZE );
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return FileVisitResult.CONTINUE;
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}
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@Override
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public FileVisitResult visitFileFailed( Path file, IOException exc )
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{
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ComputerCraft.log.error( "Error computing file size for {}", file, exc );
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return FileVisitResult.CONTINUE;
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}
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}
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private static long measureUsedSpace( File file )
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{
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if( !file.exists() ) return 0;
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try
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{
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Visitor visitor = new Visitor();
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Files.walkFileTree( file.toPath(), visitor );
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return visitor.size;
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}
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catch( IOException e )
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{
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ComputerCraft.log.error( "Error computing file size for {}", file, e );
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return 0;
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}
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}
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}
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