nsIScriptableInputStream Interface

 Return the number of bytes currently available in the stream 
  @param _retval [out] parameter to hold the number of bytes 
         if an error occurs, the parameter will be undefined 
  @return error status 

unsigned long available()

 
 Closes the stream. 

void close()

 Wrap the given nsIInputStream with this nsIScriptableInputStream. 
  @param aInputStream [in] parameter providing the stream to wrap 

void init(in nsIInputStream aInputStream)

 Read data from the stream. 
  @param aCount [in] the maximum number of bytes to read 
  @param _retval [out] the data

string read(in unsigned long aCount)