/**
* Unpack the content read from <i>source</i> into <i>targetFolder</i>. If the
* <i>skipTopFolder</i> is set, then don't assume that the archive contains one single folder and
* unpack the content of that folder, not including the folder itself.
*
* @param source The input source. Must be in <i>TAR</i> format.
* @param targetFolder The destination folder for the unpack. Not used when a <tt>fileCatcher</tt>
* is provided
* @param skipTopFolder Set to <code>true</code> to unpack beneath the top folder of the archive.
* The archive must consist of one single folder and nothing else in order for this to work.
* @param fileCatcher Used when specific files should be picked from the archive without writing
* them to disk. Can be <tt>null</tt>.
* @throws IOException
*/
public static void unpack(
InputStream source, File targetFolder, boolean skipTopFolder, FileCatcher fileCatcher)
throws IOException {
String topFolderName = null;
Map<File, Map<Integer, List<String>>> chmodMap =
new HashMap<File, Map<Integer, List<String>>>();
TarArchiveInputStream in = new TarArchiveInputStream(source);
try {
TarArchiveEntry te = in.getNextTarEntry();
if (te == null) {
throw new IOException("No entry in the tar file");
}
do {
if (te.isGlobalPaxHeader()) continue;
String name = te.getName();
if (name.startsWith("./._"))
// MacOS specific extended attributes addition. Just skip it
continue;
if (skipTopFolder) {
int firstSlash = name.indexOf('/');
if (firstSlash < 0) throw new IOException("Archive doesn't contain one single folder");
String tfName = name.substring(0, firstSlash);
if (topFolderName == null) topFolderName = tfName;
else if (!tfName.equals(topFolderName))
throw new IOException("Archive doesn't contain one single folder");
name = name.substring(firstSlash + 1);
}
if (name.length() == 0) continue;
String linkName = te.getLinkName();
if (linkName != null) {
if (linkName.trim().equals("")) linkName = null;
}
if (fileCatcher != null) {
if (linkName == null && !te.isDirectory() && fileCatcher.accept(name)) {
if (fileCatcher.catchData(name, in))
// We're done here
return;
}
continue;
}
File outFile = new File(targetFolder, name);
if (linkName != null) {
if (!OsUtil.link(targetFolder, name, te.getLinkName()))
throw new IOException(
"Archive contains links but they are not supported on this platform");
} else {
if (te.isDirectory()) {
outFile.mkdirs();
} else {
outFile.getParentFile().mkdirs();
OutputStream target = new FileOutputStream(outFile);
StreamUtil.copy(in, target);
target.close();
outFile.setLastModified(te.getModTime().getTime());
}
registerChmodFile(chmodMap, targetFolder, Integer.valueOf(te.getMode()), name);
}
} while ((te = in.getNextTarEntry()) != null);
} finally {
StreamUtil.close(in);
}
chmod(chmodMap);
}
public long getLastModified() {
return entry.getModTime().getTime();
}