Added ReadableFile#size()

main/filesystem-api/src/main/java/org/cryptomator/filesystem/ReadableFile.java

@@ -29,8 +29,16 @@ public interface ReadableFile extends ReadableByteChannel {
 	 *             if an {@link IOException} occurs while reading from this
 	 *             {@code ReadableBytes}
 	 */
+	@Override
 	int read(ByteBuffer target) throws UncheckedIOException;
 
+	/**
+	 * @return The current size of the file. This value is a snapshot and might have been changed by concurrent modifications.
+	 * @throws UncheckedIOException
+	 *             if an {@link IOException} occurs
+	 */
+	long size() throws UncheckedIOException;
+
 	/**
 	 * <p>
 	 * Fast-forwards or rewinds the file to the specified position.

main/filesystem-api/src/main/java/org/cryptomator/filesystem/delegating/DelegatingReadableFile.java

@@ -42,6 +42,11 @@ public class DelegatingReadableFile implements ReadableFile {
 		return delegate.read(target);
 	}
 
+	@Override
+	public long size() throws UncheckedIOException {
+		return delegate.size();
+	}
+
 	@Override
 	public void position(long position) throws UncheckedIOException {
 		delegate.position(position);

main/filesystem-crypto/src/main/java/org/cryptomator/filesystem/crypto/CryptoReadableFile.java

@@ -61,6 +61,12 @@ class CryptoReadableFile implements ReadableFile {
 		}
 	}
 
+	@Override
+	public long size() throws UncheckedIOException {
+		assert decryptor != null : "decryptor is always being set during position(long)";
+		return decryptor.contentLength();
+	}
+
 	@Override
 	public void position(long position) throws UncheckedIOException {
 		if (readAheadTask != null) {

main/filesystem-crypto/src/main/java/org/cryptomator/filesystem/crypto/CryptoWritableFile.java

@@ -109,6 +109,7 @@ class CryptoWritableFile implements WritableFile {
 			encryptor.append(FileContentCryptor.EOF);
 			writeTask.get();
 			writeHeader();
+			// TODO append padding
 		} catch (ExecutionException e) {
 			if (e.getCause() instanceof UncheckedIOException) {
 				throw (UncheckedIOException) e.getCause();

main/filesystem-inmemory/src/main/java/org/cryptomator/filesystem/inmem/InMemoryReadableFile.java

@@ -55,6 +55,11 @@ class InMemoryReadableFile implements ReadableFile {
 		}
 	}
 
+	@Override
+	public long size() throws UncheckedIOException {
+		return contentGetter.get().limit();
+	}
+
 	@Override
 	public void position(long position) throws UncheckedIOException {
 		assert position < Integer.MAX_VALUE : "Can not use that big in-memory files.";

main/filesystem-inmemory/src/test/java/org/cryptomator/filesystem/inmem/InMemoryFileSystemTest.java

@@ -103,6 +103,11 @@ public class InMemoryFileSystemTest {
 		}
 		Assert.assertTrue(fooFile.exists());
 
+		// check if size = 11 bytes
+		try (ReadableFile readable = fooFile.openReadable()) {
+			Assert.assertEquals(11, readable.size());
+		}
+
 		// copy foo to bar
 		File barFile = fs.file("bar.txt");
 		try (WritableFile writable = barFile.openWritable()) {

main/filesystem-nio/src/main/java/org/cryptomator/filesystem/nio/ReadableNioFile.java

@@ -45,6 +45,11 @@ class ReadableNioFile implements ReadableFile {
 		return open;
 	}
 
+	@Override
+	public long size() throws UncheckedIOException {
+		return channel.size();
+	}
+
 	@Override
 	public void position(long position) throws UncheckedIOException {
 		assertOpen();
@@ -73,7 +78,7 @@ class ReadableNioFile implements ReadableFile {
 		target.ensureChannelIsOpened();
 		SharedFileChannel targetChannel = target.channel();
 		targetChannel.truncate(0);
-		long size = channel.size();
+		long size = size();
 		long transferred = 0;
 		while (transferred < size) {
 			transferred += channel.transferTo(transferred, size - transferred, targetChannel, transferred);

main/filesystem-nio/src/test/java/org/cryptomator/filesystem/nio/ReadableNioFileTest.java

@@ -88,6 +88,16 @@ public class ReadableNioFileTest {
 		inTest.position(-1);
 	}
 
+	@Test
+	public void testSizeReturnsSizeOfChannel() {
+		long expectedSize = 85472;
+		when(channel.size()).thenReturn(expectedSize);
+
+		long actualSize = inTest.size();
+
+		assertThat(actualSize, is(expectedSize));
+	}
+
 	@Test
 	public void testReadDelegatesToChannelReadFullyWithZeroPositionIfNotSet() {
 		ByteBuffer buffer = mock(ByteBuffer.class);

main/jackrabbit-filesystem-adapter/src/main/java/org/cryptomator/webdav/jackrabbitservlet/DavFile.java

@@ -28,6 +28,8 @@ import org.cryptomator.filesystem.jackrabbit.FileLocator;
 
 class DavFile extends DavNode<FileLocator> {
 
+	private static final int BUFFER_SIZE = 32 * 1024;
+
 	public DavFile(FilesystemResourceFactory factory, LockManager lockManager, DavSession session, FileLocator node) {
 		super(factory, lockManager, session, node);
 	}
@@ -44,9 +46,8 @@ class DavFile extends DavNode<FileLocator> {
 			return;
 		}
 		try (ReadableFile src = node.openReadable(); WritableByteChannel dst = Channels.newChannel(outputContext.getOutputStream())) {
-			// TODO filesize before sending content
-			outputContext.setContentLength(-1l);
-			ByteBuffer buf = ByteBuffer.allocate(1337);
+			outputContext.setContentLength(src.size());
+			ByteBuffer buf = ByteBuffer.allocate(BUFFER_SIZE);
 			do {
 				buf.clear();
 				src.read(buf);

main/jackrabbit-filesystem-adapter/src/main/java/org/cryptomator/webdav/jackrabbitservlet/DavFolder.java

@@ -40,6 +40,8 @@ import org.cryptomator.filesystem.jackrabbit.FolderLocator;
 
 class DavFolder extends DavNode<FolderLocator> {
 
+	private static final int BUFFER_SIZE = 32 * 1024;
+
 	public DavFolder(FilesystemResourceFactory factory, LockManager lockManager, DavSession session, FolderLocator folder) {
 		super(factory, lockManager, session, folder);
 		properties.add(new ResourceType(ResourceType.COLLECTION));
@@ -73,7 +75,7 @@ class DavFolder extends DavNode<FolderLocator> {
 
 	private void addMemberFile(DavFile memberFile, InputStream inputStream) {
 		try (ReadableByteChannel src = Channels.newChannel(inputStream); WritableFile dst = node.file(memberFile.getDisplayName()).openWritable()) {
-			ByteBuffer buf = ByteBuffer.allocate(1337);
+			ByteBuffer buf = ByteBuffer.allocate(BUFFER_SIZE);
 			while (src.read(buf) != -1) {
 				buf.flip();
 				dst.write(buf);
@@ -150,7 +152,6 @@ class DavFolder extends DavNode<FolderLocator> {
 	@Override
 	protected void setModificationTime(Instant instant) {
 		// TODO Auto-generated method stub
-
 	}
 
 	@Override