[DownloadText] Buffer everything before converting to UTF-8

As we read the incoming data in chunks, if a multi-byte UTF-8 char were
at such a chunk boundary, it would break during conversion, so buffer
everything first and convert later in one go.

1 files changed, 4 insertions, 3 deletions

diff --git a/src/main/java/org/openslx/taskmanager/tasks/DownloadText.java b/src/main/java/org/openslx/taskmanager/tasks/DownloadText.java
index b62dc12..db0b126 100644
--- a/src/main/java/org/openslx/taskmanager/tasks/DownloadText.java
+++ b/src/main/java/org/openslx/taskmanager/tasks/DownloadText.java
@@ -1,6 +1,7 @@
 package org.openslx.taskmanager.tasks;
 
 import java.io.BufferedInputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
 import java.net.URL;
 import java.net.URLConnection;
@@ -49,19 +50,19 @@ public class DownloadText extends AbstractTask
 				status.error = "Remote file too large: " + status.size + " bytes!";
 				return false;
 			}
-			StringBuilder sb = new StringBuilder( Math.max( 8, status.size ) );
 
+			final ByteArrayOutputStream baos = new ByteArrayOutputStream( Math.max( 512, status.size ) );
 			final byte data[] = new byte[ 9000 ];
 			int count;
 			while ( ( count = in.read( data, 0, data.length ) ) != -1 ) {
-				sb.append( new String( data, 0, count, StandardCharsets.UTF_8 ) );
+				baos.write( data, 0, count );
 				status.complete += count;
 				if ( status.complete > MAX_SIZE ) {
 					status.error = "Remote file too large: > " + status.complete + " bytes!";
 					return false;
 				}
 			}
-			status.content = sb.toString();
+			status.content = new String( baos.toByteArray(), StandardCharsets.UTF_8 );
 			return true;
 		} catch ( IOException e ) {
 			status.error = "Download error: " + e.toString();