Exemplo n.º 1
0
  // Mostly for [Issue#19]
  @Test
  public void testLongSkips() throws Exception {
    // 64k per block, 200k gives 3 full, one small
    byte[] fluff = constructFluff(200000);
    byte[] comp = LZFEncoder.encode(fluff);

    // we get about 200k, maybe byte or two more, so:
    final int LENGTH = fluff.length;

    LZFInputStream in = new LZFInputStream(new ByteArrayInputStream(comp));
    // read one byte for fun
    Assert.assertEquals(in.read(), fluff[0] & 0xFF);
    // then skip all but one
    long amt = in.skip(LENGTH - 2);
    Assert.assertEquals(amt, (long) (LENGTH - 2));
    Assert.assertEquals(in.read(), fluff[LENGTH - 1] & 0xFF);

    Assert.assertEquals(in.read(), -1);
    in.close();
  }
Exemplo n.º 2
0
 @Test
 public void testAvailable() throws IOException {
   ByteArrayInputStream bis = new ByteArrayInputStream(compressedBytes);
   LZFInputStream is = new LZFInputStream(bis);
   Assert.assertSame(is.getUnderlyingInputStream(), bis);
   Assert.assertEquals(0, is.available());
   // read one byte; should decode bunch more, make available
   is.read();
   int total = 1; // since we read one byte already
   Assert.assertEquals(is.available(), 65534);
   // and after we skip through all of it, end with -1 for EOF
   long count;
   while ((count = is.skip(16384L)) > 0L) {
     total += (int) count;
   }
   // nothing more available; but we haven't yet closed so:
   Assert.assertEquals(is.available(), 0);
   // and then we close it:
   is.close();
   Assert.assertEquals(is.available(), 0);
   Assert.assertEquals(total, compressableInputLength);
 }
Exemplo n.º 3
0
  /**
   * Test that creates a longer piece of content, compresses it, and reads back in arbitrary small
   * reads.
   */
  private void doTestIncremental(boolean fullReads) throws IOException {
    // first need to compress something...
    String[] words = new String[] {"what", "ever", "some", "other", "words", "too"};
    StringBuilder sb = new StringBuilder(258000);
    Random rnd = new Random(123);
    while (sb.length() < 256000) {
      int i = (rnd.nextInt() & 31);
      if (i < words.length) {
        sb.append(words[i]);
      } else {
        sb.append(i);
      }
    }
    byte[] uncomp = sb.toString().getBytes("UTF-8");
    ByteArrayOutputStream bytes = new ByteArrayOutputStream();
    LZFOutputStream lzOut = new LZFOutputStream(bytes);
    lzOut.write(uncomp);
    lzOut.close();
    byte[] comp = bytes.toByteArray();

    // read back, in chunks
    bytes = new ByteArrayOutputStream(uncomp.length);
    byte[] buffer = new byte[500];
    LZFInputStream lzIn = new LZFInputStream(new ByteArrayInputStream(comp), fullReads);
    int pos = 0;

    while (true) {
      int len = 1 + ((rnd.nextInt() & 0x7FFFFFFF) % buffer.length);
      int offset = buffer.length - len;

      int count = lzIn.read(buffer, offset, len);
      if (count < 0) {
        break;
      }
      if (count > len) {
        Assert.fail(
            "Requested "
                + len
                + " bytes (offset "
                + offset
                + ", array length "
                + buffer.length
                + "), got "
                + count);
      }
      pos += count;
      // with full reads, ought to get full results
      if (count != len) {
        if (fullReads) {
          // Except at the end, with last incomplete chunk
          if (pos != uncomp.length) {
            Assert.fail(
                "Got partial read (when requested full read!), position "
                    + pos
                    + " (of full "
                    + uncomp.length
                    + ")");
          }
        }
      }
      bytes.write(buffer, offset, count);
    }
    byte[] result = bytes.toByteArray();
    Assert.assertEquals(result.length, uncomp.length);
    Assert.assertEquals(result, uncomp);
  }