Unzip a file in kotlin script [.kts] - bash

Question

I was toying with the idea of rewriting some existing bash scripts in kotlin script.
One of the scripts has a section that unzips all the files in a directory. In bash:
unzip *.zip
Is there a nice way to unzip a file(s) in kotlin script?

Answer 1

The easiest way is to just use exec unzip (assuming that the name of your zip file is stored in zipFileName variable):
ProcessBuilder()
.command("unzip", zipFileName)
.redirectError(ProcessBuilder.Redirect.INHERIT)
.redirectOutput(ProcessBuilder.Redirect.INHERIT)
.start()
.waitFor()
The different approach, that is more portable (it will run on any OS and does not require unzip executable to be present), but somewhat less feature-full (it will not restore Unix permissions), is to do unzipping in code:
import java.io.File
import java.util.zip.ZipFile
ZipFile(zipFileName).use { zip ->
zip.entries().asSequence().forEach { entry ->
zip.getInputStream(entry).use { input ->
File(entry.name).outputStream().use { output ->
input.copyTo(output)
}
}
}
}
If you need to scan all *.zip file, then you can do it like this:
File(".").list { _, name -> name.endsWith(".zip") }?.forEach { zipFileName ->
// any of the above approaches
}
or like this:
import java.nio.file.*
Files.newDirectoryStream(Paths.get("."), "*.zip").forEach { path ->
val zipFileName = path.toString()
// any of the above approaches
}

Answer 2

this code is for unziping from Assets
1.for unzping first u need InputStream
2.put it in ZipInputStream
3.if directory is not exist u have to make by .mkdirs()
private val BUFFER_SIZE = 8192//2048;
private val SDPath = Environment.getExternalStorageDirectory().absolutePath
private val unzipPath = "$SDPath/temp/zipunzipFile/unzip/"
var count: Int
val buffer = ByteArray(BUFFER_SIZE)
val context: Context = this
val am = context.getAssets()
val stream = context.getAssets().open("raw.zip")
try {
ZipInputStream(stream).use { zis ->
var ze: ZipEntry
while (zis.nextEntry.also { ze = it } != null) {
var fileName = ze.name
fileName = fileName.substring(fileName.indexOf("/") + 1)
val file = File(unzipPath, fileName)
val dir = if (ze.isDirectory) file else file.getParentFile()
if (!dir.isDirectory() && !dir.mkdirs())
throw FileNotFoundException("Invalid path: " + dir.getAbsolutePath())
if (ze.isDirectory) continue
val fout = FileOutputStream(file)
try {
while ( zis.read(buffer).also { count = it } != -1)
fout.write(buffer, 0, count)
} finally {
val fout : FileOutputStream =openFileOutput(fileName, Context.MODE_PRIVATE)
fout.close()
}
}
for unziping from externalStorage:
private val sourceFile= "$SDPath/unzipFile/data/"
ZipInputStream zis = null;
try {
zis = new ZipInputStream(new BufferedInputStream(new
FileInputStream(sourceFile)));
ZipEntry ze;
int count;
byte[] buffer = new byte[BUFFER_SIZE];
while ((ze = zis.getNextEntry()) != null) {
String fileName = ze.getName();
fileName = fileName.substring(fileName.indexOf("/") + 1);
File file = new File(destinationFolder, fileName);
File dir = ze.isDirectory() ? file : file.getParentFile();
if (!dir.isDirectory() && !dir.mkdirs())
throw new FileNotFoundException("Invalid path: " +
dir.getAbsolutePath());
if (ze.isDirectory()) continue;
FileOutputStream fout = new FileOutputStream(file);
try {
while ((count = zis.read(buffer)) != -1)
fout.write(buffer, 0, count);
} finally {
fout.close();
}
}
} catch (IOException ioe) {
Log.d(TAG, ioe.getMessage());
return false;
} finally {
if (zis != null)
try {
zis.close();
} catch (IOException e) {
}
}
return true;