Program: 96411
Project: 96411
Buggy source:
/** 
 * Unpacks the given <i>epubfile</i> to the <i>destination</i> directory. This method will also validate the first item contained in the EPUB (see  {@link #writeEPUBHeader(ZipOutputStream)}). <p> If the destination folder does not already exist it will be created. Additionally the modification timestamp of this folder will be set to the same as the originating EPUB file. </p>
 * @param epubfile the EPUB file
 * @param destination the destination folder
 * @throws IOException if the operation was unsuccessful
 */
public static void unzip(File epubfile,File destination) throws IOException {
  if (!destination.exists()) {
    if (!destination.mkdirs()) {
      throw new IOException("String_Node_Str");
    }
  }
  ZipInputStream in=new ZipInputStream(new FileInputStream(epubfile));
  byte[] buf=new byte[BUFFERSIZE];
  ZipEntry entry=null;
  boolean checkFirstItem=true;
  while ((entry=in.getNextEntry()) != null) {
    String entryName=entry.getName();
    File newFile=new File(destination.getAbsolutePath() + File.separator + entryName);
    if (entry.isDirectory()) {
      newFile.mkdirs();
      if (entry.getTime() > 0) {
        newFile.setLastModified(entry.getTime());
      }
      continue;
    }
 else {
      newFile.getParentFile().mkdirs();
    }
    int n;
    FileOutputStream fileoutputstream=new FileOutputStream(newFile);
    while ((n=in.read(buf,0,BUFFERSIZE)) > -1) {
      fileoutputstream.write(buf,0,n);
    }
    fileoutputstream.close();
    in.closeEntry();
    if (entry.getTime() > 0) {
      newFile.setLastModified(entry.getTime());
    }
    if (checkFirstItem) {
      if (!entryName.equals("String_Node_Str")) {
        throw new IOException("String_Node_Str");
      }
      String type=new String(buf);
      if (!type.trim().equals(OPSPublication.MIMETYPE_EPUB)) {
        throw new IOException("String_Node_Str" + OPSPublication.MIMETYPE_EPUB + "String_Node_Str");
      }
      checkFirstItem=false;
    }
  }
  destination.setLastModified(epubfile.lastModified());
}

Fixed version (ground truth):
/** 
 * Unpacks the given <i>epubfile</i> to the <i>destination</i> directory. This method will also validate the first item contained in the EPUB (see  {@link #writeEPUBHeader(ZipOutputStream)}). <p> If the destination folder does not already exist it will be created. Additionally the modification timestamp of this folder will be set to the same as the originating EPUB file. </p>
 * @param epubfile the EPUB file
 * @param destination the destination folder
 * @throws FileNotFoundException when EPUB file does not exist
 * @throws IOException if the operation was unsuccessful
 */
public static void unzip(File epubfile,File destination) throws IOException {
  if (!destination.exists()) {
    if (!destination.mkdirs()) {
      throw new IOException("String_Node_Str");
    }
  }
  ZipInputStream in=new ZipInputStream(new FileInputStream(epubfile));
  byte[] buf=new byte[BUFFERSIZE];
  ZipEntry entry=null;
  boolean checkFirstItem=true;
  while ((entry=in.getNextEntry()) != null) {
    String entryName=entry.getName();
    File newFile=new File(destination.getAbsolutePath() + File.separator + entryName);
    if (entry.isDirectory()) {
      newFile.mkdirs();
      if (entry.getTime() > 0) {
        newFile.setLastModified(entry.getTime());
      }
      continue;
    }
 else {
      newFile.getParentFile().mkdirs();
    }
    int n;
    FileOutputStream fileoutputstream=new FileOutputStream(newFile);
    while ((n=in.read(buf,0,BUFFERSIZE)) > -1) {
      fileoutputstream.write(buf,0,n);
    }
    fileoutputstream.close();
    in.closeEntry();
    if (entry.getTime() > 0) {
      newFile.setLastModified(entry.getTime());
    }
    if (checkFirstItem) {
      if (!entryName.equals("String_Node_Str")) {
        throw new IOException("String_Node_Str");
      }
      String type=new String(buf);
      if (!type.trim().equals(OPSPublication.MIMETYPE_EPUB)) {
        throw new IOException("String_Node_Str" + OPSPublication.MIMETYPE_EPUB + "String_Node_Str");
      }
      checkFirstItem=false;
    }
  }
  in.close();
  destination.setLastModified(epubfile.lastModified());
}