Inflater setInput() function in Java with examples
The setInput() function of the Inflater class is used to set input data for uncompression. This function should be called when needsInput() returns true indicating input buffer is empty.
Function Signature:
public void setInput(byte[] b) public void setInput(byte[] b, int offset, int len)
Syntax:
i.setInput(byte[]); i.setInput(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 has no return value
Exception: The function does not throw any exception
Example 1: use of setInput(byte[] b) function
// Java program to describe the use // of setInput(byte[] b) 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 = "w3wiki" , 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 setInput(byte[] b, int offset, int len) function
// Java program to describe the use // of setInput(byte[] b, int offset, int len) 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 = "w3wiki" , 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 the compression // use Inflater to get back the original data // Inflater Inflater i = new Inflater(); // set the input for inflator i.setInput(output, 0 , 14 ); // 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:
Reference: https://docs.oracle.com/javase/7/docs/api/java/util/zip/Inflater.html#setInput()