Skip to main content

How to decompress a file in Kotlin

How to decompress a file in Kotlin.

Here's a detailed step-by-step tutorial on how to decompress a file in Kotlin:

Step 1: Import the required libraries​

To decompress a file in Kotlin, you'll need to import the java.util.zip package. Add the following import statement at the top of your Kotlin file:

import java.util.zip.*

Step 2: Create a function for decompression​

Next, create a function that will handle the decompression process. Let's name it decompressFile. This function will take two parameters: the path of the file to be decompressed and the destination path where the decompressed file will be saved. Here's the function declaration:

fun decompressFile(filePath: String, destinationPath: String) {
    // Decompression logic goes here
}

Step 3: Read the compressed file​

Inside the decompressFile function, use a FileInputStream to read the compressed file. This will allow you to access the bytes of the file. Here's how you can read the file:

val fileInputStream = FileInputStream(filePath)
val inputStream = BufferedInputStream(fileInputStream)

Step 4: Create an output stream for the decompressed file​

Next, create an output stream to write the decompressed data to a file. You can use the FileOutputStream class for this purpose. Here's how you can create the output stream:

val fileOutputStream = FileOutputStream(destinationPath)
val outputStream = BufferedOutputStream(fileOutputStream)

Step 5: Create a decompression stream​

Now that you have both the input and output streams, you need to create a decompression stream. In Kotlin, you can use the InflaterInputStream class from the java.util.zip package to decompress the data. Here's how you can create the decompression stream:

val inflaterInputStream = InflaterInputStream(inputStream)

Step 6: Read and write the decompressed data​

To decompress the file, you need to read the compressed data from the input stream and write the decompressed data to the output stream. You can use a buffer to read and write the data in chunks. Here's how you can do it:

val buffer = ByteArray(1024)
var length: Int

while (inflaterInputStream.read(buffer).also { length = it } > 0) {
    outputStream.write(buffer, 0, length)
}

// Flush and close the streams
outputStream.flush()
outputStream.close()
inflaterInputStream.close()
inputStream.close()

Step 7: Handle exceptions​

Don't forget to handle any exceptions that may occur during the decompression process. You can use a try-catch block to catch and handle any IOException that may be thrown. Here's an example of how you can handle exceptions:

try {
    // Decompression logic goes here
} catch (e: IOException) {
    e.printStackTrace()
}

Step 8: Test the decompression function​

To test the decompressFile function, you can create a main function and call the decompressFile function with the appropriate file path and destination path. Here's an example:

fun main() {
    val filePath = "path/to/compressed/file.zip"
    val destinationPath = "path/to/destination/file.txt"

    decompressFile(filePath, destinationPath)
}

That's it! You now have a complete step-by-step tutorial on how to decompress a file in Kotlin. You can customize the code according to your specific use case.