Program: 20735
Project: 20735
Buggy source:
public boolean prepare(){
  try {
    if (archive.getFirstDownloadLink().getHost().equals(DUMMY_HOSTER)) {
      Archive a=buildArchive(archive.getFirstDownloadLink());
      archive.setDownloadLinks(a.getDownloadLinks());
      archive.setType(a.getType());
    }
    if (archive.getType() == Archive.SINGLE_FILE) {
      if (new Regex(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str",Pattern.CASE_INSENSITIVE).matches()) {
        format=ArchiveFormat.RAR;
      }
 else       if (new Regex(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str",Pattern.CASE_INSENSITIVE).matches()) {
        format=ArchiveFormat.SEVEN_ZIP;
      }
 else       if (new Regex(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str",Pattern.CASE_INSENSITIVE).matches()) {
        format=ArchiveFormat.ZIP;
      }
 else       if (new Regex(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str",Pattern.CASE_INSENSITIVE).matches()) {
        format=ArchiveFormat.GZIP;
      }
 else       if (new Regex(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str",Pattern.CASE_INSENSITIVE).matches()) {
        format=ArchiveFormat.BZIP2;
      }
      inArchive=SevenZip.openInArchive(format,new RandomAccessFileInStream(new RandomAccessFile(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str")));
    }
 else     if (archive.getType() == Archive.MULTI) {
      MultiOpener multiopener=new MultiOpener();
      inArchive=SevenZip.openInArchive(ArchiveFormat.SEVEN_ZIP,new VolumedArchiveInStream(archive.getFirstDownloadLink().getFileOutput(),multiopener));
    }
 else     if (archive.getType() == Archive.MULTI_RAR) {
      RarOpener raropener=new RarOpener();
      IInStream inStream=raropener.getStream(archive.getFirstDownloadLink().getFileOutput());
      inArchive=SevenZip.openInArchive(ArchiveFormat.RAR,inStream,raropener);
    }
 else {
      return false;
    }
    long size=0;
    int numberOfFiles=0;
    for (    ISimpleInArchiveItem item : inArchive.getSimpleInterface().getArchiveItems()) {
      if (item.getPath().trim().equals("String_Node_Str"))       continue;
      if (item.isEncrypted()) {
        archive.setProtected(true);
      }
      size+=item.getSize();
      if (item.getSize() > 0) {
        numberOfFiles++;
      }
    }
    archive.setSize(size);
    archive.setNumberOfFiles(numberOfFiles);
  }
 catch (  SevenZipException e) {
    archive.setProtected(true);
    return true;
  }
catch (  Exception e) {
    return false;
  }
  return true;
}

Fixed version (ground truth):
public boolean prepare(){
  try {
    if (archive.getFirstDownloadLink().getHost().equals(DUMMY_HOSTER)) {
      Archive a=buildArchive(archive.getFirstDownloadLink());
      archive.setDownloadLinks(a.getDownloadLinks());
      archive.setType(a.getType());
    }
    if (archive.getType() == Archive.SINGLE_FILE) {
      if (new Regex(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str",Pattern.CASE_INSENSITIVE).matches()) {
        format=ArchiveFormat.RAR;
      }
 else       if (new Regex(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str",Pattern.CASE_INSENSITIVE).matches()) {
        format=ArchiveFormat.SEVEN_ZIP;
      }
 else       if (new Regex(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str",Pattern.CASE_INSENSITIVE).matches()) {
        format=ArchiveFormat.ZIP;
      }
 else       if (new Regex(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str",Pattern.CASE_INSENSITIVE).matches()) {
        format=ArchiveFormat.GZIP;
      }
 else       if (new Regex(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str",Pattern.CASE_INSENSITIVE).matches()) {
        format=ArchiveFormat.BZIP2;
      }
      stream=new RandomAccessFileInStream(new RandomAccessFile(archive.getFirstDownloadLink().getFileOutput(),"String_Node_Str"));
      inArchive=SevenZip.openInArchive(format,stream);
    }
 else     if (archive.getType() == Archive.MULTI) {
      multiopener=new MultiOpener();
      IInStream inStream=new VolumedArchiveInStream(archive.getFirstDownloadLink().getFileOutput(),multiopener);
      inArchive=SevenZip.openInArchive(ArchiveFormat.SEVEN_ZIP,inStream);
    }
 else     if (archive.getType() == Archive.MULTI_RAR) {
      raropener=new RarOpener();
      IInStream inStream=raropener.getStream(archive.getFirstDownloadLink().getFileOutput());
      inArchive=SevenZip.openInArchive(ArchiveFormat.RAR,inStream,raropener);
    }
 else {
      return false;
    }
    long size=0;
    int numberOfFiles=0;
    for (    ISimpleInArchiveItem item : inArchive.getSimpleInterface().getArchiveItems()) {
      if (item.getPath().trim().equals("String_Node_Str"))       continue;
      if (item.isEncrypted()) {
        archive.setProtected(true);
      }
      size+=item.getSize();
      if (item.getSize() > 0) {
        numberOfFiles++;
      }
    }
    archive.setSize(size);
    archive.setNumberOfFiles(numberOfFiles);
  }
 catch (  SevenZipException e) {
    archive.setProtected(true);
    return true;
  }
catch (  Exception e) {
    return false;
  }
  return true;
}