Inflater inflate() function in Java with examples

The inflate() function of the Inflater class is used to uncompress the input data and fill the given buffer with the uncompressed data. The function returns the number of bytes of the uncompressed data.

Function Signature:

public int inflate(byte[] b)
public int inflate(byte[] b, int offset, int length)

Syntax:

i.inflate(byte[])
i.inflate(byte[], int, int )

Parameter: The various parameters accepted by these overloaded functions are:

• byte[] b: This is the input array that is to be inflated
• int offset: This is the starting offset from which the values are to be read in the given array
• int length: This is the maximum length to be compressed from the starting offset.

Return Type: The function returns an integer value which is the size of the uncompressed data.
Exception: The function throws DataFormatException, if compression data format is invalid

Example 1: use of inflate(byte[] b) function

// Java program to describe the use
// of inflate function

import java.util.zip.*;
import java.io.UnsupportedEncodingException;

class GFG {
    public static void main(String args[])
        throws UnsupportedEncodingException,
               DataFormatException
    {

        // compress the data

        // deflater
        Deflater d = new Deflater();

        // get the text
        String pattern = "GeeksforGeeks", text = "";

        // generate the text
        for (int i = 0; i < 4; i++)
            text += pattern;

        // set the input for deflator
        d.setInput(text.getBytes("UTF-8"));

        // finish
        d.finish();

        // output bytes
        byte output[] = new byte[1024];

        // compress the data
        int size = d.deflate(output);

        // end
        d.end();

        // end of compression

        // use Inflater to get back the original data

        // Inflater
        Inflater i = new Inflater();

        // set the input for inflator
        i.setInput(output);

        // output bytes
        byte inflater_output[] = new byte[1024];

        // uncompress the data
        int org_size = i.inflate(inflater_output);

        // output of inflater and deflater
        System.out.println("Compressed output of deflater : "
                           + new String(output));
        System.out.println("Compressed output of Inflater : "
                           + new String(inflater_output, "UTF-8"));

        // end
        i.end();
    }
}

Output:

Example 2: use of inflate(byte[] b, int offset, int length) function

// Java program to describe the use
// of inflate function

import java.util.zip.*;
import java.io.UnsupportedEncodingException;

class GFG {
    public static void main(String args[])
        throws UnsupportedEncodingException,
               DataFormatException
    {

        // compress the data

        // deflater
        Deflater d = new Deflater();

        // get the text
        String pattern = "GeeksforGeeks", text = "";

        // generate the text
        for (int i = 0; i < 4; i++)
            text += pattern;

        // set the input for deflator
        d.setInput(text.getBytes("UTF-8"));

        // finish
        d.finish();

        // output bytes
        byte output[] = new byte[1024];

        // compress the data
        int size = d.deflate(output);

        // end
        d.end();

        // end of compression

        // use Inflater to get back the original data

        // Inflater
        Inflater i = new Inflater();

        // set the input for inflator
        i.setInput(output);

        // output bytes
        byte inflater_output[] = new byte[1024];

        // uncompress the data
        int org_size = i.inflate(inflater_output, 0, 15);

        // output of inflater and deflater
        System.out.println("Compressed output of deflater : "
                           + new String(output));
        System.out.println("Compressed output of Inflater : "
                           + new String(inflater_output, "UTF-8"));

        // end
        i.end();
    }
}

Output:

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/zip/Inflater.html#inflate(byte[])