Examples of at.molindo.thirdparty.org.apache.tools.bzip2.CBZip2OutputStream

Package at.molindo.thirdparty.org.apache.tools.bzip2

Examples of at.molindo.thirdparty.org.apache.tools.bzip2.CBZip2OutputStream

org.apache.tools.bzip2.CBZip2OutputStream

An output stream that compresses into the BZip2 format (without the file header chars) into another stream.

The compression requires large amounts of memory. Thus you should call the {@link #close() close()} method as soon as possible, to forceCBZip2OutputStream to release the allocated memory.

You can shrink the amount of allocated memory and maybe raise the compression speed by choosing a lower blocksize, which in turn may cause a lower compression ratio. You can avoid unnecessary memory allocation by avoiding using a blocksize which is bigger than the size of the input.

You can compute the memory usage for compressing by the following formula:

 <code>400k + (9 * blocksize)</code>.

To get the memory required for decompression by {@link CBZip2InputStream CBZip2InputStream} use

 <code>65k + (5 * blocksize)</code>.

Memory usage by blocksize
Blocksize	Compression memory usage	Decompression memory usage
100k	1300k	565k
200k	2200k	1065k
300k	3100k	1565k
400k	4000k	2065k
500k	4900k	2565k
600k	5800k	3065k
700k	6700k	3565k
800k	7600k	4065k
900k	8500k	4565k

For decompression CBZip2InputStream allocates less memory if the bzipped input is smaller than one block.

Instances of this class are not threadsafe.

TODO: Update to BZip2 1.0.1

    }
    
    private void compress() throws IOException {
        InputStream in = null;
        OutputStream out = null;
        CBZip2OutputStream bzout = null;
        
        if (use_stdout) {
            bzout = new CBZip2OutputStream(stdout, clevel);
        }
        
        for (File file : files) {
            if (file.getName().equals("-")) {
                processStream(stdin, bzout);
                continue;
            }
            
            try {
                if (use_stdout) {
                    if ((in = openFileRead(file)) == null) {
                        rc = 1;
                        continue;
                    }
                    processStream(in, bzout);
                    continue;
                }
                try {
                    File bzfile = new File(file.getAbsolutePath() + ".bz2");
                    if ((out = openFileWrite(bzfile, true, force)) == null) {
                        rc = 1;
                        continue;
                    }
                    bzout = new CBZip2OutputStream(out, clevel);
                    if ((in = openFileRead(file)) == null) {
                        rc = 1;
                        continue;
                    }
                    processStream(in, bzout);
                    float sizeDiff = ((float) bzfile.length() / (float) file.length()) * 100;
                    notice(String.format(fmt_size_diff, file, sizeDiff, bzfile));
                    if (!keep) file.delete();
                } finally {
                    close(bzout);
                }
            } finally {
                close(in);
            }
        }
        // TEST need to see if this is even necessary, and if it is
        // should it be within a finally block
        if (use_stdout) {
            bzout.close();
        }
    }

View Full Code Here

    /**
     * Wraps an OutputStream with a compression stream for writing compressed archives.
     */
    private OutputStream wrapOutputStream(OutputStream out) throws IOException {
        if (compress == USE_BZIP) {
            return new CBZip2OutputStream(out);
        }
        if (compress == USE_GZIP) {
            return new GZIPOutputStream(out);
        }

View Full Code Here

     */
    protected OutputStream wrapStream(OutputStream out) throws IOException {
        for (int i = 0; i < MAGIC.length; i++) {
            out.write(MAGIC[i]);
        }
        return new CBZip2OutputStream(out);
    }

View Full Code Here

                return new GZIPOutputStream(ostream);
            } else {
                if (BZIP2.equals(v)) {
                    ostream.write('B');
                    ostream.write('Z');
                    return new CBZip2OutputStream(ostream);
                }
            }
            return ostream;
        }

View Full Code Here

    public double d2(String x, String y) {
        String str = x + y;
        double result = 0.0f;
        try {
            ByteArrayOutputStream baos = new ByteArrayOutputStream(str.length());
            CBZip2OutputStream os = new CBZip2OutputStream(baos);
            os.write(str.getBytes());
            os.close();
            baos.close();
            result = baos.toByteArray().length;
        } catch (IOException e) {
            e.printStackTrace();
        }

View Full Code Here

                return new GZIPOutputStream(ostream);
            } else {
                if (BZIP2.equals(v)) {
                    ostream.write('B');
                    ostream.write('Z');
                    return new CBZip2OutputStream(ostream);
                }
            }
            return ostream;
        }

View Full Code Here

 * @ant.task category="packaging"
 */


public class BZip2 extends Pack {
    protected void pack() {
        CBZip2OutputStream zOut = null;
        try {
            BufferedOutputStream bos =
                new BufferedOutputStream(new FileOutputStream(zipFile));
            bos.write('B');
            bos.write('Z');
            zOut = new CBZip2OutputStream(bos);
            zipFile(source, zOut);
        } catch (IOException ioe) {
            String msg = "Problem creating bzip2 " + ioe.getMessage();
            throw new BuildException(msg, ioe, getLocation());
        } finally {
            if (zOut != null) {
                try {
                    // close up
                    zOut.close();
                } catch (IOException e) {
                    //ignore
                }
            }
        }

View Full Code Here

                return new GZIPOutputStream(ostream);
            } else {
                if (BZIP2.equals(value)) {
                    ostream.write('B');
                    ostream.write('Z');
                    return new CBZip2OutputStream(ostream);
                }
            }
            return ostream;
        }

View Full Code Here

                return new GZIPOutputStream(ostream);
            } else {
                if (BZIP2.equals(v)) {
                    ostream.write('B');
                    ostream.write('Z');
                    return new CBZip2OutputStream(ostream);
                }
            }
            return ostream;
        }

View Full Code Here

            // def.setLevel(Deflater.BEST_COMPRESSION);
          }
        };
        break;
      case BZIP2:
        gzipOS = new CBZip2OutputStream(countOS);
        break;
      default:
        throw new RuntimeException("Unsupported compression: " + compressor);
      }

View Full Code Here

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