From 4110f63bcffb5112677fad45a6952314bde713df Mon Sep 17 00:00:00 2001
From: Niki Roo <niki@nikiroo.be>
Date: Fri, 23 Mar 2018 14:49:03 +0100
Subject: [PATCH] New: IOUtils.unzip()

---
 changelog.md                      |  4 +++
 src/be/nikiroo/utils/IOUtils.java | 53 +++++++++++++++++++++++++++++++
 2 files changed, 57 insertions(+)

diff --git a/changelog.md b/changelog.md
index 7b44b8ba..8892800a 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,9 @@
 # nikiroo-utils
 
+## Version 4.3.0
+
+- New: IOUtils.Unzip()
+
 ## Version 4.2.1
 
 - Fix small bug in Downloader
diff --git a/src/be/nikiroo/utils/IOUtils.java b/src/be/nikiroo/utils/IOUtils.java
index d8331144..3e2f6e76 100644
--- a/src/be/nikiroo/utils/IOUtils.java
+++ b/src/be/nikiroo/utils/IOUtils.java
@@ -13,6 +13,7 @@ import java.io.OutputStream;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.zip.ZipEntry;
+import java.util.zip.ZipInputStream;
 import java.util.zip.ZipOutputStream;
 
 /**
@@ -141,6 +142,58 @@ public class IOUtils {
 		}
 	}
 
+	/**
+	 * Unzip the given ZIP file into the target directory.
+	 * 
+	 * @param zipFile
+	 *            the ZIP file
+	 * @param targetDirectory
+	 *            the target directory
+	 * 
+	 * @return the number of extracted files (not directories)
+	 * 
+	 * @throws IOException
+	 *             in case of I/O errors
+	 */
+	public static long unzip(File zipFile, File targetDirectory)
+			throws IOException {
+		long count = 0;
+
+		if (targetDirectory.exists() && targetDirectory.isFile()) {
+			throw new IOException("Cannot unzip " + zipFile + " into "
+					+ targetDirectory + ": it is not a directory");
+		}
+
+		targetDirectory.mkdir();
+		if (!targetDirectory.exists()) {
+			throw new IOException("Cannot create target directory "
+					+ targetDirectory);
+		}
+
+		FileInputStream in = new FileInputStream(zipFile);
+		try {
+			ZipInputStream zipStream = new ZipInputStream(in);
+			try {
+				for (ZipEntry entry = zipStream.getNextEntry(); entry != null; entry = zipStream
+						.getNextEntry()) {
+					File file = new File(targetDirectory, entry.getName());
+					if (entry.isDirectory()) {
+						file.mkdirs();
+					} else {
+						IOUtils.write(zipStream, file);
+						count++;
+					}
+				}
+			} finally {
+				zipStream.close();
+			}
+		} finally {
+			in.close();
+		}
+
+		return count;
+	}
+
 	/**
 	 * Write the {@link String} content to {@link File}.
 	 * 
-- 
2.27.0