android-platform-libcore/luni/src/test/java/org/apache/harmony/archive/tests/java/util/zip/GZIPInputStreamTest.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.harmony.archive.tests.java.util.zip;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.zip.Checksum;
import java.util.zip.GZIPInputStream;
import java.util.zip.GZIPOutputStream;

import tests.support.resource.Support_Resources;

public class GZIPInputStreamTest extends junit.framework.TestCase {
	File resources;

	class TestGZIPInputStream extends GZIPInputStream {
		TestGZIPInputStream(InputStream in) throws IOException {
			super(in);
		}

		TestGZIPInputStream(InputStream in, int size) throws IOException {
			super(in, size);
		}

		Checksum getChecksum() {
			return crc;
		}

		boolean endofInput() {
			return eos;
		}
	}

	/**
	 * @tests java.util.zip.GZIPInputStream#GZIPInputStream(java.io.InputStream)
	 */
	public void test_ConstructorLjava_io_InputStream() {
		// test method java.util.zip.GZIPInputStream.constructor
		try {
			Support_Resources.copyFile(resources, "GZIPInputStream",
					"hyts_gInput.txt.gz");
			final URL gInput = new File(resources.toString()
					+ "/GZIPInputStream/hyts_gInput.txt.gz").toURL();
			TestGZIPInputStream inGZIP = new TestGZIPInputStream(gInput
					.openConnection().getInputStream());
			assertNotNull("the constructor for GZIPInputStream is null",
					inGZIP);
			assertEquals("the CRC value of the inputStream is not zero", 0, inGZIP
					.getChecksum().getValue());
			inGZIP.close();
		} catch (IOException e) {
			fail(
					"an IO error occured while trying to open the input file");
		}
	}

	/**
	 * @tests java.util.zip.GZIPInputStream#GZIPInputStream(java.io.InputStream,
	 *        int)
	 */
	public void test_ConstructorLjava_io_InputStreamI() {
		// test method java.util.zip.GZIPInputStream.constructorI
		try {
			Support_Resources.copyFile(resources, "GZIPInputStream",
					"hyts_gInput.txt.gz");
			final URL gInput = new File(resources.toString()
					+ "/GZIPInputStream/hyts_gInput.txt.gz").toURL();
			TestGZIPInputStream inGZIP = new TestGZIPInputStream(gInput
					.openConnection().getInputStream(), 200);
			assertNotNull("the constructor for GZIPInputStream is null",
					inGZIP);
			assertEquals("the CRC value of the inputStream is not zero", 0, inGZIP
					.getChecksum().getValue());
			inGZIP.close();
		} catch (IOException e) {
			fail(
					"an IO error occured while trying to open the input file");
		}
	}

	/**
	 * @tests java.util.zip.GZIPInputStream#read(byte[], int, int)
	 */
	public void test_read$BII() throws IOException {
		// test method java.util.zip.GZIPInputStream.readBII
        byte orgBuf[] = { '3', '5', '2', 'r', 'g', 'e', 'f', 'd', 'e', 'w' };
        byte outBuf[] = new byte[100];
        int result = 0;
        Support_Resources.copyFile(resources, "GZIPInputStream",
                "hyts_gInput.txt.gz");
        String resPath = resources.toString();
        if (resPath.charAt(0) == '/' || resPath.charAt(0) == '\\') {
            resPath = resPath.substring(1);
        }
        final URL gInput = new URL("file:/" + resPath
                + "/GZIPInputStream/hyts_gInput.txt.gz");
        TestGZIPInputStream inGZIP = new TestGZIPInputStream(gInput
                .openConnection().getInputStream());
        while (!(inGZIP.endofInput())) {
            result += inGZIP.read(outBuf, result, outBuf.length - result);
        }
        assertEquals(
                "the checkSum value of the compressed and decompressed data does not equal",
                2074883667L, inGZIP.getChecksum().getValue());
        for (int i = 0; i < orgBuf.length; i++) {
            assertTrue(
                    "the decompressed data does not equal the original data decompressed",
                    orgBuf[i] == outBuf[i]);
            // System.out.println(orgBuf[i] + " " + outBuf[i]);
        }
        int r = 0;
        try {
            inGZIP.read(outBuf, 100, 1);
        } catch (IndexOutOfBoundsException e) {
            r = 1;
        }
        inGZIP.close();
        // line below fails on RI also, comment out.
        // assertEquals("Boundary Check was not present", 1, r);

        // Create compressed data which is exactly 512 bytes (after the
        // header),
        // the size of the InflaterStream internal buffer
        byte[] test = new byte[507];
        for (int i = 0; i < 256; i++) {
            test[i] = (byte) i;
        }
        for (int i = 256; i < test.length; i++) {
            test[i] = (byte) (256 - i);
        }
        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        GZIPOutputStream out = new GZIPOutputStream(bout);
        out.write(test);
        out.close();
        byte[] comp = bout.toByteArray();
        GZIPInputStream gin2 = new GZIPInputStream(new ByteArrayInputStream(
                comp), 512);
        int total = 0;
        while ((result = gin2.read(test)) != -1) {
            total += result;
        }
        assertEquals("Should return -1", -1, gin2.read());
        gin2.close();
        assertTrue("Incorrectly decompressed", total == test.length);

        gin2 = new GZIPInputStream(new ByteArrayInputStream(comp), 512);
        total = 0;
        while ((result = gin2.read(new byte[200])) != -1) {
            total += result;
        }
        assertEquals("Should return -1", -1, gin2.read());
        gin2.close();
        assertTrue("Incorrectly decompressed", total == test.length);

        gin2 = new GZIPInputStream(new ByteArrayInputStream(comp), 516);
        total = 0;
        while ((result = gin2.read(new byte[200])) != -1) {
            total += result;
        }
        assertEquals("Should return -1", -1, gin2.read());
        gin2.close();
        assertTrue("Incorrectly decompressed", total == test.length);

        comp[40] = 0;
        gin2 = new GZIPInputStream(new ByteArrayInputStream(comp), 512);
        boolean exception = false;
        try {
            while (gin2.read(test) != -1) {
                ;
            }
        } catch (IOException e) {
            exception = true;
        }
        assertTrue("Exception expected", exception);

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        GZIPOutputStream zipout = new GZIPOutputStream(baos);
        zipout.write(test);
        zipout.close();
        outBuf = new byte[530];
        GZIPInputStream in= new GZIPInputStream(new ByteArrayInputStream(baos.toByteArray()));
        try {
            in.read(outBuf, 530, 1);
            fail("Test failed IOOBE was not thrown");
        } catch (IndexOutOfBoundsException e) {
        }
        while (true) {
            result = in.read(outBuf, 0, 5);
            if (result == -1) {
                //"EOF was reached";
                break;
            }
        }
        result = -10;
        result = in.read(null, 100, 1);
        result = in.read(outBuf, -100, 1);
        result = in.read(outBuf, -1, 1);// 100, 1);
	}

	/**
	 * @tests java.util.zip.GZIPInputStream#close()
	 */
	public void test_close() {
		// test method java.util.zip.GZIPInputStream.close
		byte outBuf[] = new byte[100];
		try {
			int result = 0;
			Support_Resources.copyFile(resources, "GZIPInputStream",
					"hyts_gInput.txt.gz");
			String resPath = resources.toString();
			if (resPath.charAt(0) == '/' || resPath.charAt(0) == '\\') {
                resPath = resPath.substring(1);
            }
			final URL gInput = new URL("file:/" + resPath
					+ "/GZIPInputStream/hyts_gInput.txt.gz");
			TestGZIPInputStream inGZIP = new TestGZIPInputStream(gInput
					.openConnection().getInputStream());
			while (!(inGZIP.endofInput())) {
				result += inGZIP.read(outBuf, result, outBuf.length - result);
			}
			assertEquals("the checkSum value of the compressed and decompressed data does not equal",
					2074883667L, inGZIP.getChecksum().getValue());
			inGZIP.close();
			int r = 0;
			try {
				inGZIP.read(outBuf, 0, 1);
			} catch (IOException e) {
				r = 1;
			}
			assertEquals("GZIPInputStream can still be used after close is called",
					1, r);
		} catch (IOException e) {
			e.printStackTrace();
			fail("unexpected: " + e);
		}
	}

    /**
     * Regression test for HARMONY-3703.
     * @tests java.util.zip.GZIPInputStream#read()
     */
    public void test_read() throws IOException {
        GZIPInputStream gis = null;
        int result = 0;
        byte[] buffer = new byte[] {1,2,3,4,5,6,7,8,9,10};
        File f = new File(resources.getAbsolutePath() + "test.gz");
        FileOutputStream out = new FileOutputStream(f);
        GZIPOutputStream gout = new GZIPOutputStream(out);

        // write 100 bytes to the stream
        for(int i = 0; i < 10; i++) {
            gout.write(buffer);
        }
        gout.finish();
        out.write(1);
        out.close();

        gis = new GZIPInputStream(new FileInputStream(f));
        buffer = new byte[100];
        gis.read(buffer);
        result = gis.read();
        gis.close();
        f.delete();

        assertEquals("Incorrect value returned at the end of the file", -1, result);
    }

	@Override
    protected void setUp() {
		resources = Support_Resources.createTempFolder();
	}

	@Override
    protected void tearDown() {
	}

}