Using Qat‐Java

Example

1. Create a directory for your example project:

   mkdir -p my_example_project
   

2. Navigate to your project directory and create a directory for your package.

   cd my_example_project
   mkdir -p com/example
   

3. Download the qat-java-1.0.0.jar from maven central.

   wget https://repo1.maven.org/maven2/com/intel/qat/qat-java/1.0.0/qat-java-1.0.0.jar 
   

4. Create a ByteArrayExample.java file with the following content in the com/example directory:

   package com.example;
   
   import com.intel.qat.QatException;
   import com.intel.qat.QatZipper;
   
   public class ByteArrayExample {
    public static void main(String[] args) {
      try {
        String inputStr = "The quick brown fox jumps over the lazy dog.";
        byte[] input = inputStr.getBytes();
   
        // Create a QatZipper object
        QatZipper qzip = new QatZipper();
        
        // Create a buffer with enough size for compression
        byte[] compressedData = new byte[qzip.maxCompressedLength(input.length)];
   
        // Compress the bytes
        int compressedSize = qzip.compress(input, compressedData);
   
        // Decompress the bytes into a String
        byte[] decompressedData = new byte[input.length];
        int decompressedSize = qzip.decompress(compressedData, decompressedData);
   
        // Release resources
        qzip.end();
   
        // Convert the bytes into a String
        String outputStr = new String(decompressedData, 0, decompressedSize);
        System.out.println("Decompressed data: " + outputStr);
      } catch (QatException e) {
        e.printStackTrace();
      }
    }
   } 
   

5. Compile the ByteArrayExample.java run the following command:

   javac -cp qat-java-1.0.0.jar com/example/ByteArrayExample.java 
   

6. Run your example:

   java -cp .:qat-java-1.0.0.jar com.example.ByteArrayExample
   

   Output:

   Decompressed data: The quick brown fox jumps over the lazy dog.