From 07cbc76b1f3d408f5899caff9add8e4138871579 Mon Sep 17 00:00:00 2001
From: ralph isenmann
Date: Thu, 27 Jan 2022 11:42:13 +0100
Subject: Add TarArchiveReader and TarArchiveWriter as Util classes.

- Wraps the jtar dependency
---
 src/main/java/org/openslx/util/TarArchiveUtil.java | 127 +++++++++++++++++++--
 1 file changed, 116 insertions(+), 11 deletions(-)

(limited to 'src/main/java/org/openslx/util')

diff --git a/src/main/java/org/openslx/util/TarArchiveUtil.java b/src/main/java/org/openslx/util/TarArchiveUtil.java
index 09c4a2c..20af003 100644
--- a/src/main/java/org/openslx/util/TarArchiveUtil.java
+++ b/src/main/java/org/openslx/util/TarArchiveUtil.java
@@ -2,28 +2,133 @@ package org.openslx.util;
 
 import org.kamranzafar.jtar.TarEntry;
 import org.kamranzafar.jtar.TarHeader;
+import org.kamranzafar.jtar.TarInputStream;
 import org.kamranzafar.jtar.TarOutputStream;
 
+import java.io.BufferedInputStream;
+import java.io.BufferedOutputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
 import java.nio.charset.StandardCharsets;
 
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+
+
 public class TarArchiveUtil {
 
+	private TarArchiveUtil() {}
 
+	public static class TarArchiveReader implements AutoCloseable {
+		private boolean isCompressed;
+		private final TarInputStream tarInputStream;
 
-	public static void tarPutFile(TarOutputStream output, String fileName, String data) throws IOException
-	{
-		if (data == null)
-			return;
-		tarPutFile(output, fileName, data.getBytes(StandardCharsets.UTF_8));
+		private TarEntry currentEntry = null;
+
+		public TarArchiveReader(InputStream in) throws IOException {
+			this(in,true,false);
+		}
+
+		public TarArchiveReader(InputStream in, boolean isBuffered, boolean isCompressed) throws IOException {
+			this.isCompressed = isCompressed;
+			
+			InputStream stream = in;
+			if (isBuffered) {
+				stream = new BufferedInputStream(stream);
+			}
+
+			if (isCompressed) {
+				stream = new GZIPInputStream(stream);
+			}
+
+			this.tarInputStream = new TarInputStream(stream);
+		}
+
+		public boolean hasNextEntry() throws IOException {
+			this.currentEntry = this.tarInputStream.getNextEntry();
+			if (this.currentEntry != null) {
+				return true;
+			} else {
+				return false;
+			}
+		}
+
+		public String getEntryName() {
+			return this.currentEntry.getName();
+		}
+
+		public byte[] readCurrentEntry() throws IOException	{
+			ByteArrayOutputStream output = new ByteArrayOutputStream();
+			byte[] rawData = new byte[1024];
+			int count = 0;
+
+			while ((count = this.tarInputStream.read(rawData)) != -1) {
+				output.write(rawData, 0, count);
+			}
+
+			return output.toByteArray();
+		}
+
+		@Override
+		public void close() throws IOException {
+			tarInputStream.close();			
+		}
+	
 	}
 
-	public static void tarPutFile(TarOutputStream output, String fileName, byte[] data) throws IOException
+	public static class TarArchiveWriter implements AutoCloseable
 	{
-		if (data == null)
-			return;
-		output.putNextEntry(new TarEntry(
-				TarHeader.createHeader(fileName, data.length, Util.unixTime(), false, 0644)));
-		output.write(data);
+		private boolean isBuffered;
+		private boolean isCompressed;
+		private final TarOutputStream tarOutputStream;
+	
+		public TarArchiveWriter (OutputStream out) throws IOException {
+			this(out, true, true);
+		}
+
+		public TarArchiveWriter (OutputStream out, boolean isBuffered, boolean isCompressed) throws IOException {
+			this.isBuffered = isBuffered;
+			this.isCompressed = isCompressed;
+
+			OutputStream stream = out;
+			
+			if (isBuffered) {
+				stream = new BufferedOutputStream(stream);
+			}
+
+			if (isCompressed) {
+				stream = new GZIPOutputStream(stream);
+			}
+
+			this.tarOutputStream = new TarOutputStream(stream);
+		}
+
+		public void writeFile(String filename, String data) throws IOException {
+
+			if (data == null)
+				return;
+			putFile(filename, data.getBytes(StandardCharsets.UTF_8));
+		}
+
+		public void writeFile(String filename, byte[] data) throws IOException {
+			if (data == null)
+				return;
+			putFile(filename, data);
+		}
+
+		private void putFile(String filename, byte[] data) throws IOException {
+			if (data == null)
+				return;
+			tarOutputStream.putNextEntry(new TarEntry(TarHeader.createHeader(filename,
+				data.length, Util.unixTime(), false, 0644)));
+			tarOutputStream.write(data);
+		}
+
+		@Override
+		public void close() throws Exception {
+			tarOutputStream.close();
+		}
 	}
 }
-- 
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