TestDeflate.java

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package org.apache.hc.client5.http.entity;

import java.io.ByteArrayOutputStream;
import java.nio.charset.StandardCharsets;
import java.util.function.UnaryOperator;
import java.util.zip.Deflater;

import org.apache.hc.client5.http.entity.compress.ContentCodecRegistry;
import org.apache.hc.client5.http.entity.compress.ContentCoding;
import org.apache.hc.core5.http.ContentType;
import org.apache.hc.core5.http.HttpEntity;
import org.apache.hc.core5.http.io.entity.ByteArrayEntity;
import org.apache.hc.core5.http.io.entity.EntityUtils;
import org.apache.hc.core5.http.io.entity.StringEntity;
import org.junit.jupiter.api.Assertions;
import org.junit.jupiter.api.Test;

class TestDeflate {

    @Test
    void testCompressDecompress() throws Exception {

        final String s = "some kind of text";
        final byte[] input = s.getBytes(StandardCharsets.US_ASCII);

        // Compress the bytes
        final byte[] compressed = new byte[input.length * 2];
        final Deflater compresser = new Deflater();
        compresser.setInput(input);
        compresser.finish();
        final int len = compresser.deflate(compressed);

        final HttpEntity entity = ContentCodecRegistry
                .decoder(ContentCoding.DEFLATE)
                .apply(new ByteArrayEntity(compressed, 0, len, ContentType.APPLICATION_OCTET_STREAM));

        Assertions.assertEquals(s, EntityUtils.toString(entity));
    }

    @Test
    void testEncodeThenDecode() throws Exception {

        final String text = "some kind of text";

        final HttpEntity plain = new StringEntity(text, ContentType.TEXT_PLAIN);
        final UnaryOperator<HttpEntity> encoder = ContentCodecRegistry.encoder(ContentCoding.DEFLATE);
        Assertions.assertNotNull(encoder, "deflate encoder must exist");

        final HttpEntity deflated = encoder.apply(plain);

        final ByteArrayOutputStream buf = new ByteArrayOutputStream();
        deflated.writeTo(buf);

        final HttpEntity decoded = ContentCodecRegistry
                .decoder(ContentCoding.DEFLATE)
                .apply(new ByteArrayEntity(buf.toByteArray(), ContentType.APPLICATION_OCTET_STREAM));

        Assertions.assertEquals(text, EntityUtils.toString(decoded, StandardCharsets.US_ASCII));
    }


}