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public void writeString(String data,int length) throws IOException
{
assert(m_file!=null);
byte[] tpby = new byte[length];
System.arraycopy(data.getBytes(), 0, tpby, 0, data.length());
for(int i = 0; i < length; i ++)
{
if(i < data.length())
m_file.write(tpby[i]);
else
{
byte[] buf = new byte[length-data.length()];
for (int i = 0; i < (ength-data.length()); i++)
array[i] = (byte) 0;
m_file.write(buf[i- data.length()]);
}
}
}