/**
* Return the uncompressed size for a Tar file.
*
* @param tarFile The Tarred file
* @return Size when uncompressed, in bytes
* @throws IOException
*/
private int getTarSizeUncompressed(File tarFile) throws IOException {
int size = 0;
TarInputStream tis = new TarInputStream(new BufferedInputStream(new FileInputStream(tarFile)));
TarEntry entry;
while ((entry = tis.getNextEntry()) != null) {
if (!entry.isDirectory()) {
size += entry.getSize();
}
}
return size;
}
/**
* Untar the contents of a tar file into the given directory, ignoring the relative pathname in
* the tar file, and delete the tar file.
*
* <p>Uses jtar: http://code.google.com/p/jtar/
*
* @param tarFile The tar file to be untarred
* @param destinationDir The directory to untar into
* @throws IOException
*/
private void untar(File tarFile, File destinationDir) throws IOException {
Log.d(TAG, "Untarring...");
final int uncompressedSize = getTarSizeUncompressed(tarFile);
Integer percentComplete;
int percentCompleteLast = 0;
int unzippedBytes = 0;
final Integer progressMin = 50;
final int progressMax = 100 - progressMin;
publishProgress("Uncompressing data for " + languageName + "...", progressMin.toString());
// Extract all the files
TarInputStream tarInputStream =
new TarInputStream(new BufferedInputStream(new FileInputStream(tarFile)));
TarEntry entry;
while ((entry = tarInputStream.getNextEntry()) != null) {
int len;
final int BUFFER = 8192;
byte data[] = new byte[BUFFER];
String pathName = entry.getName();
String fileName = pathName.substring(pathName.lastIndexOf('/'), pathName.length());
OutputStream outputStream = new FileOutputStream(destinationDir + fileName);
BufferedOutputStream bufferedOutputStream = new BufferedOutputStream(outputStream);
Log.d(TAG, "Writing " + fileName.substring(1, fileName.length()) + "...");
while ((len = tarInputStream.read(data, 0, BUFFER)) != -1) {
bufferedOutputStream.write(data, 0, len);
unzippedBytes += len;
percentComplete =
(int) ((unzippedBytes / (float) uncompressedSize) * progressMax) + progressMin;
if (percentComplete > percentCompleteLast) {
publishProgress(
"Uncompressing data for " + languageName + "...", percentComplete.toString());
percentCompleteLast = percentComplete;
}
}
bufferedOutputStream.flush();
bufferedOutputStream.close();
}
tarInputStream.close();
if (tarFile.exists()) {
tarFile.delete();
}
}