import java.io.FileInputStream;
import java.io.FileOutputStream;

/** This class chops up a file */
public class Chunk
{
  public static void main(String[] s) throws Exception
  {
    if (s.length != 3)
    {
      System.err.println("Args are <in> <out> <chunk size>");
      return;
    }
    int chunkSize;
    try
    {
      chunkSize = Integer.parseInt(s[2].trim());
    }
    catch (NumberFormatException nfe)
    {
      System.err.println("Could not read chunk size in " + s[0]);
      return;
    }
    FileInputStream in = null;
    FileOutputStream out = null;
    byte[] buffer = new byte[1024 * 64];
    try
    {
      in = new FileInputStream(s[0]);
      int writtenOut = 0;
      int inBuffer = 0;
      int inBufferOffset = 0;
      int outputFileCount = 1;
      for (;;)
      {
        if (inBuffer > inBufferOffset)
        {
          if (out == null)
          {
            out = new FileOutputStream(s[1] + (outputFileCount++));
            writtenOut = 0;
          }
          int todo = inBuffer - inBufferOffset;
          if (todo > (chunkSize - writtenOut))
          {
            todo = chunkSize - writtenOut;
          }
          if (todo <= 0)
          {
            out.close();
            out = null;
            writtenOut = 0;
            continue;
          }
          out.write(buffer, inBufferOffset, todo);
          writtenOut += todo;
          inBufferOffset += todo;
          continue;
        }
        // Here with nothing else to write out
        inBuffer = in.read(buffer);
        if (inBuffer <= 0)
        { // end of file
          break;
        }
        inBufferOffset = 0;
      }
    }
    finally
    {
      if (in != null)
      {
        try
        {
          in.close();
        }
        catch (Exception ex)
        {
          System.err.println("Exception closing input file " + ex);
        }
      }
      if (out != null)
      {
        try
        {
          out.close();
        }
        catch (Exception ex)
        {
          System.err.println("Exception closing output file " + ex);
        }
      }
    }
  }
}